1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2015-2017 Google, Inc
5 * USB Power Delivery protocol stack.
8 #include <linux/completion.h>
9 #include <linux/debugfs.h>
10 #include <linux/device.h>
11 #include <linux/hrtimer.h>
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/kthread.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/power_supply.h>
18 #include <linux/proc_fs.h>
19 #include <linux/property.h>
20 #include <linux/sched/clock.h>
21 #include <linux/seq_file.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/usb.h>
25 #include <linux/usb/pd.h>
26 #include <linux/usb/pd_ado.h>
27 #include <linux/usb/pd_bdo.h>
28 #include <linux/usb/pd_ext_sdb.h>
29 #include <linux/usb/pd_vdo.h>
30 #include <linux/usb/role.h>
31 #include <linux/usb/tcpm.h>
32 #include <linux/usb/typec_altmode.h>
34 #include <uapi/linux/sched/types.h>
36 #define FOREACH_STATE(S) \
43 S(SRC_SEND_CAPABILITIES), \
44 S(SRC_SEND_CAPABILITIES_TIMEOUT), \
45 S(SRC_NEGOTIATE_CAPABILITIES), \
46 S(SRC_TRANSITION_SUPPLY), \
48 S(SRC_WAIT_NEW_CAPABILITIES), \
56 S(SNK_DISCOVERY_DEBOUNCE), \
57 S(SNK_DISCOVERY_DEBOUNCE_DONE), \
58 S(SNK_WAIT_CAPABILITIES), \
59 S(SNK_NEGOTIATE_CAPABILITIES), \
60 S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
61 S(SNK_TRANSITION_SINK), \
62 S(SNK_TRANSITION_SINK_VBUS), \
66 S(DEBUG_ACC_ATTACHED), \
67 S(AUDIO_ACC_ATTACHED), \
68 S(AUDIO_ACC_DEBOUNCE), \
71 S(HARD_RESET_START), \
72 S(SRC_HARD_RESET_VBUS_OFF), \
73 S(SRC_HARD_RESET_VBUS_ON), \
74 S(SNK_HARD_RESET_SINK_OFF), \
75 S(SNK_HARD_RESET_WAIT_VBUS), \
76 S(SNK_HARD_RESET_SINK_ON), \
79 S(SRC_SOFT_RESET_WAIT_SNK_TX), \
85 S(DR_SWAP_SEND_TIMEOUT), \
87 S(DR_SWAP_CHANGE_DR), \
91 S(PR_SWAP_SEND_TIMEOUT), \
94 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
95 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
96 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
97 S(PR_SWAP_SRC_SNK_SINK_ON), \
98 S(PR_SWAP_SNK_SRC_SINK_OFF), \
99 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
100 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
102 S(VCONN_SWAP_ACCEPT), \
103 S(VCONN_SWAP_SEND), \
104 S(VCONN_SWAP_SEND_TIMEOUT), \
105 S(VCONN_SWAP_CANCEL), \
106 S(VCONN_SWAP_START), \
107 S(VCONN_SWAP_WAIT_FOR_VCONN), \
108 S(VCONN_SWAP_TURN_ON_VCONN), \
109 S(VCONN_SWAP_TURN_OFF_VCONN), \
112 S(FR_SWAP_SEND_TIMEOUT), \
113 S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF), \
114 S(FR_SWAP_SNK_SRC_NEW_SINK_READY), \
115 S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
120 S(SNK_TRY_WAIT_DEBOUNCE), \
121 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
123 S(SRC_TRYWAIT_DEBOUNCE), \
124 S(SRC_TRYWAIT_UNATTACHED), \
128 S(SRC_TRY_DEBOUNCE), \
130 S(SNK_TRYWAIT_DEBOUNCE), \
131 S(SNK_TRYWAIT_VBUS), \
134 S(GET_STATUS_SEND), \
135 S(GET_STATUS_SEND_TIMEOUT), \
136 S(GET_PPS_STATUS_SEND), \
137 S(GET_PPS_STATUS_SEND_TIMEOUT), \
140 S(GET_SINK_CAP_TIMEOUT), \
144 S(PORT_RESET_WAIT_OFF), \
149 #define FOREACH_AMS(S) \
151 S(POWER_NEGOTIATION), \
156 S(GET_SOURCE_CAPABILITIES), \
157 S(GET_SINK_CAPABILITIES), \
158 S(POWER_ROLE_SWAP), \
163 S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
164 S(GETTING_SOURCE_SINK_STATUS), \
165 S(GETTING_BATTERY_CAPABILITIES), \
166 S(GETTING_BATTERY_STATUS), \
167 S(GETTING_MANUFACTURER_INFORMATION), \
169 S(FIRMWARE_UPDATE), \
170 S(DISCOVER_IDENTITY), \
171 S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
174 S(DFP_TO_UFP_ENTER_MODE), \
175 S(DFP_TO_UFP_EXIT_MODE), \
176 S(DFP_TO_CABLE_PLUG_ENTER_MODE), \
177 S(DFP_TO_CABLE_PLUG_EXIT_MODE), \
180 S(UNSTRUCTURED_VDMS), \
181 S(STRUCTURED_VDMS), \
185 #define GENERATE_ENUM(e) e
186 #define GENERATE_STRING(s) #s
189 FOREACH_STATE(GENERATE_ENUM)
192 static const char * const tcpm_states[] = {
193 FOREACH_STATE(GENERATE_STRING)
197 FOREACH_AMS(GENERATE_ENUM)
200 static const char * const tcpm_ams_str[] = {
201 FOREACH_AMS(GENERATE_STRING)
205 VDM_STATE_ERR_BUSY = -3,
206 VDM_STATE_ERR_SEND = -2,
207 VDM_STATE_ERR_TMOUT = -1,
209 /* Anything >0 represents an active state */
212 VDM_STATE_WAIT_RSP_BUSY = 3,
213 VDM_STATE_SEND_MESSAGE = 4,
216 enum pd_msg_request {
220 PD_MSG_CTRL_NOT_SUPP,
221 PD_MSG_DATA_SINK_CAP,
222 PD_MSG_DATA_SOURCE_CAP,
227 ADEV_NOTIFY_USB_AND_QUEUE_VDM,
229 ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
234 * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
235 * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
238 enum frs_typec_current {
245 /* Events from low level driver */
247 #define TCPM_CC_EVENT BIT(0)
248 #define TCPM_VBUS_EVENT BIT(1)
249 #define TCPM_RESET_EVENT BIT(2)
250 #define TCPM_FRS_EVENT BIT(3)
251 #define TCPM_SOURCING_VBUS BIT(4)
253 #define LOG_BUFFER_ENTRIES 1024
254 #define LOG_BUFFER_ENTRY_SIZE 128
256 /* Alternate mode support */
258 #define SVID_DISCOVERY_MAX 16
259 #define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
261 #define GET_SINK_CAP_RETRY_MS 100
262 #define SEND_DISCOVER_RETRY_MS 100
264 struct pd_mode_data {
265 int svid_index; /* current SVID index */
267 u16 svids[SVID_DISCOVERY_MAX];
268 int altmodes; /* number of alternate modes */
269 struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
273 * @min_volt: Actual min voltage at the local port
274 * @req_min_volt: Requested min voltage to the port partner
275 * @max_volt: Actual max voltage at the local port
276 * @req_max_volt: Requested max voltage to the port partner
277 * @max_curr: Actual max current at the local port
278 * @req_max_curr: Requested max current of the port partner
279 * @req_out_volt: Requested output voltage to the port partner
280 * @req_op_curr: Requested operating current to the port partner
281 * @supported: Parter has at least one APDO hence supports PPS
282 * @active: PPS mode is active
300 struct mutex lock; /* tcpm state machine lock */
301 struct kthread_worker *wq;
303 struct typec_capability typec_caps;
304 struct typec_port *typec_port;
306 struct tcpc_dev *tcpc;
307 struct usb_role_switch *role_sw;
309 enum typec_role vconn_role;
310 enum typec_role pwr_role;
311 enum typec_data_role data_role;
312 enum typec_pwr_opmode pwr_opmode;
314 struct usb_pd_identity partner_ident;
315 struct typec_partner_desc partner_desc;
316 struct typec_partner *partner;
318 enum typec_cc_status cc_req;
319 enum typec_cc_status src_rp; /* work only if pd_supported == false */
321 enum typec_cc_status cc1;
322 enum typec_cc_status cc2;
323 enum typec_cc_polarity polarity;
329 enum typec_port_type port_type;
332 * Set to true when vbus is greater than VSAFE5V min.
333 * Set to false when vbus falls below vSinkDisconnect max threshold.
338 * Set to true when vbus is less than VSAFE0V max.
339 * Set to false when vbus is greater than VSAFE0V max.
347 /* Set to true when Discover_Identity Command is expected to be sent in Ready states. */
355 enum pd_msg_request queued_message;
357 enum tcpm_state enter_state;
358 enum tcpm_state prev_state;
359 enum tcpm_state state;
360 enum tcpm_state delayed_state;
361 ktime_t delayed_runtime;
362 unsigned long delay_ms;
364 spinlock_t pd_event_lock;
367 struct kthread_work event_work;
368 struct hrtimer state_machine_timer;
369 struct kthread_work state_machine;
370 struct hrtimer vdm_state_machine_timer;
371 struct kthread_work vdm_state_machine;
372 struct hrtimer enable_frs_timer;
373 struct kthread_work enable_frs;
374 struct hrtimer send_discover_timer;
375 struct kthread_work send_discover_work;
376 bool state_machine_running;
377 /* Set to true when VDM State Machine has following actions. */
380 struct completion tx_complete;
381 enum tcpm_transmit_status tx_status;
383 struct mutex swap_lock; /* swap command lock */
385 bool non_pd_role_swap;
386 struct completion swap_complete;
389 unsigned int negotiated_rev;
390 unsigned int message_id;
391 unsigned int caps_count;
392 unsigned int hard_reset_count;
394 bool explicit_contract;
395 unsigned int rx_msgid;
397 /* Partner capabilities/requests */
399 u32 source_caps[PDO_MAX_OBJECTS];
400 unsigned int nr_source_caps;
401 u32 sink_caps[PDO_MAX_OBJECTS];
402 unsigned int nr_sink_caps;
404 /* Local capabilities */
405 u32 src_pdo[PDO_MAX_OBJECTS];
406 unsigned int nr_src_pdo;
407 u32 snk_pdo[PDO_MAX_OBJECTS];
408 unsigned int nr_snk_pdo;
409 u32 snk_vdo_v1[VDO_MAX_OBJECTS];
410 unsigned int nr_snk_vdo_v1;
411 u32 snk_vdo[VDO_MAX_OBJECTS];
412 unsigned int nr_snk_vdo;
414 unsigned int operating_snk_mw;
415 bool update_sink_caps;
417 /* Requested current / voltage to the port partner */
418 u32 req_current_limit;
419 u32 req_supply_voltage;
420 /* Actual current / voltage limit of the local port */
424 /* Used to export TA voltage and current */
425 struct power_supply *psy;
426 struct power_supply_desc psy_desc;
427 enum power_supply_usb_type usb_type;
431 /* PD state for Vendor Defined Messages */
432 enum vdm_states vdm_state;
434 /* next Vendor Defined Message to send */
435 u32 vdo_data[VDO_MAX_SIZE];
437 /* VDO to retry if UFP responder replied busy */
441 struct pd_pps_data pps_data;
442 struct completion pps_complete;
446 /* Alternate mode data */
447 struct pd_mode_data mode_data;
448 struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
449 struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
451 /* Deadline in jiffies to exit src_try_wait state */
452 unsigned long max_wait;
454 /* port belongs to a self powered device */
458 enum frs_typec_current new_source_frs_current;
460 /* Sink caps have been queried */
463 /* Collision Avoidance and Atomic Message Sequence */
464 enum tcpm_state upcoming_state;
466 enum tcpm_ams next_ams;
469 /* Auto vbus discharge status */
470 bool auto_vbus_discharge_enabled;
473 * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
474 * the actual currrent limit after RX of PD_CTRL_PSRDY for PD link,
475 * SNK_READY for non-pd link.
477 bool slow_charger_loop;
478 #ifdef CONFIG_DEBUG_FS
479 struct dentry *dentry;
480 struct mutex logbuffer_lock; /* log buffer access lock */
483 u8 *logbuffer[LOG_BUFFER_ENTRIES];
488 struct kthread_work work;
489 struct tcpm_port *port;
490 struct pd_message msg;
493 static const char * const pd_rev[] = {
499 #define tcpm_cc_is_sink(cc) \
500 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
501 (cc) == TYPEC_CC_RP_3_0)
503 #define tcpm_port_is_sink(port) \
504 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
505 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
507 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
508 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
509 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
511 #define tcpm_port_is_source(port) \
512 ((tcpm_cc_is_source((port)->cc1) && \
513 !tcpm_cc_is_source((port)->cc2)) || \
514 (tcpm_cc_is_source((port)->cc2) && \
515 !tcpm_cc_is_source((port)->cc1)))
517 #define tcpm_port_is_debug(port) \
518 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
520 #define tcpm_port_is_audio(port) \
521 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
523 #define tcpm_port_is_audio_detached(port) \
524 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
525 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
527 #define tcpm_try_snk(port) \
528 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
529 (port)->port_type == TYPEC_PORT_DRP)
531 #define tcpm_try_src(port) \
532 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
533 (port)->port_type == TYPEC_PORT_DRP)
535 #define tcpm_data_role_for_source(port) \
536 ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
537 TYPEC_DEVICE : TYPEC_HOST)
539 #define tcpm_data_role_for_sink(port) \
540 ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
541 TYPEC_HOST : TYPEC_DEVICE)
543 #define tcpm_sink_tx_ok(port) \
544 (tcpm_port_is_sink(port) && \
545 ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
547 #define tcpm_wait_for_discharge(port) \
548 (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
550 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
552 if (port->port_type == TYPEC_PORT_DRP) {
553 if (port->try_role == TYPEC_SINK)
554 return SNK_UNATTACHED;
555 else if (port->try_role == TYPEC_SOURCE)
556 return SRC_UNATTACHED;
557 /* Fall through to return SRC_UNATTACHED */
558 } else if (port->port_type == TYPEC_PORT_SNK) {
559 return SNK_UNATTACHED;
561 return SRC_UNATTACHED;
564 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
566 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
567 port->cc2 == TYPEC_CC_OPEN) ||
568 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
569 port->cc1 == TYPEC_CC_OPEN) ||
570 (port->polarity == TYPEC_POLARITY_CC2 &&
571 port->cc2 == TYPEC_CC_OPEN)));
578 #ifdef CONFIG_DEBUG_FS
580 static bool tcpm_log_full(struct tcpm_port *port)
582 return port->logbuffer_tail ==
583 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
587 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
589 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
590 u64 ts_nsec = local_clock();
591 unsigned long rem_nsec;
593 mutex_lock(&port->logbuffer_lock);
594 if (!port->logbuffer[port->logbuffer_head]) {
595 port->logbuffer[port->logbuffer_head] =
596 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
597 if (!port->logbuffer[port->logbuffer_head]) {
598 mutex_unlock(&port->logbuffer_lock);
603 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
605 if (tcpm_log_full(port)) {
606 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
607 strcpy(tmpbuffer, "overflow");
610 if (port->logbuffer_head < 0 ||
611 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
613 "Bad log buffer index %d\n", port->logbuffer_head);
617 if (!port->logbuffer[port->logbuffer_head]) {
619 "Log buffer index %d is NULL\n", port->logbuffer_head);
623 rem_nsec = do_div(ts_nsec, 1000000000);
624 scnprintf(port->logbuffer[port->logbuffer_head],
625 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
626 (unsigned long)ts_nsec, rem_nsec / 1000,
628 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
631 mutex_unlock(&port->logbuffer_lock);
635 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
639 /* Do not log while disconnected and unattached */
640 if (tcpm_port_is_disconnected(port) &&
641 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
642 port->state == TOGGLING))
646 _tcpm_log(port, fmt, args);
651 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
656 _tcpm_log(port, fmt, args);
660 static void tcpm_log_source_caps(struct tcpm_port *port)
664 for (i = 0; i < port->nr_source_caps; i++) {
665 u32 pdo = port->source_caps[i];
666 enum pd_pdo_type type = pdo_type(pdo);
671 scnprintf(msg, sizeof(msg),
672 "%u mV, %u mA [%s%s%s%s%s%s]",
673 pdo_fixed_voltage(pdo),
674 pdo_max_current(pdo),
675 (pdo & PDO_FIXED_DUAL_ROLE) ?
677 (pdo & PDO_FIXED_SUSPEND) ?
679 (pdo & PDO_FIXED_HIGHER_CAP) ?
681 (pdo & PDO_FIXED_USB_COMM) ?
683 (pdo & PDO_FIXED_DATA_SWAP) ?
685 (pdo & PDO_FIXED_EXTPOWER) ?
689 scnprintf(msg, sizeof(msg),
691 pdo_min_voltage(pdo),
692 pdo_max_voltage(pdo),
693 pdo_max_current(pdo));
696 scnprintf(msg, sizeof(msg),
698 pdo_min_voltage(pdo),
699 pdo_max_voltage(pdo),
703 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
704 scnprintf(msg, sizeof(msg),
706 pdo_pps_apdo_min_voltage(pdo),
707 pdo_pps_apdo_max_voltage(pdo),
708 pdo_pps_apdo_max_current(pdo));
710 strcpy(msg, "undefined APDO");
713 strcpy(msg, "undefined");
716 tcpm_log(port, " PDO %d: type %d, %s",
721 static int tcpm_debug_show(struct seq_file *s, void *v)
723 struct tcpm_port *port = (struct tcpm_port *)s->private;
726 mutex_lock(&port->logbuffer_lock);
727 tail = port->logbuffer_tail;
728 while (tail != port->logbuffer_head) {
729 seq_printf(s, "%s\n", port->logbuffer[tail]);
730 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
732 if (!seq_has_overflowed(s))
733 port->logbuffer_tail = tail;
734 mutex_unlock(&port->logbuffer_lock);
738 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
740 static void tcpm_debugfs_init(struct tcpm_port *port)
744 mutex_init(&port->logbuffer_lock);
745 snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
746 port->dentry = debugfs_create_dir(name, usb_debug_root);
747 debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
751 static void tcpm_debugfs_exit(struct tcpm_port *port)
755 mutex_lock(&port->logbuffer_lock);
756 for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
757 kfree(port->logbuffer[i]);
758 port->logbuffer[i] = NULL;
760 mutex_unlock(&port->logbuffer_lock);
762 debugfs_remove(port->dentry);
768 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
770 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
771 static void tcpm_log_source_caps(struct tcpm_port *port) { }
772 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
773 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
777 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
779 tcpm_log(port, "cc:=%d", cc);
781 port->tcpc->set_cc(port->tcpc, cc);
784 static int tcpm_enable_auto_vbus_discharge(struct tcpm_port *port, bool enable)
788 if (port->tcpc->enable_auto_vbus_discharge) {
789 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, enable);
790 tcpm_log_force(port, "%s vbus discharge ret:%d", enable ? "enable" : "disable",
793 port->auto_vbus_discharge_enabled = enable;
799 static void tcpm_apply_rc(struct tcpm_port *port)
802 * TCPCI: Move to APPLY_RC state to prevent disconnect during PR_SWAP
803 * when Vbus auto discharge on disconnect is enabled.
805 if (port->tcpc->enable_auto_vbus_discharge && port->tcpc->apply_rc) {
806 tcpm_log(port, "Apply_RC");
807 port->tcpc->apply_rc(port->tcpc, port->cc_req, port->polarity);
808 tcpm_enable_auto_vbus_discharge(port, false);
813 * Determine RP value to set based on maximum current supported
814 * by a port if configured as source.
815 * Returns CC value to report to link partner.
817 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
819 const u32 *src_pdo = port->src_pdo;
820 int nr_pdo = port->nr_src_pdo;
823 if (!port->pd_supported)
827 * Search for first entry with matching voltage.
828 * It should report the maximum supported current.
830 for (i = 0; i < nr_pdo; i++) {
831 const u32 pdo = src_pdo[i];
833 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
834 pdo_fixed_voltage(pdo) == 5000) {
835 unsigned int curr = pdo_max_current(pdo);
838 return TYPEC_CC_RP_3_0;
839 else if (curr >= 1500)
840 return TYPEC_CC_RP_1_5;
841 return TYPEC_CC_RP_DEF;
845 return TYPEC_CC_RP_DEF;
848 static void tcpm_ams_finish(struct tcpm_port *port)
850 tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
852 if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
853 if (port->negotiated_rev >= PD_REV30)
854 tcpm_set_cc(port, SINK_TX_OK);
856 tcpm_set_cc(port, SINK_TX_NG);
857 } else if (port->pwr_role == TYPEC_SOURCE) {
858 tcpm_set_cc(port, tcpm_rp_cc(port));
861 port->in_ams = false;
862 port->ams = NONE_AMS;
865 static int tcpm_pd_transmit(struct tcpm_port *port,
866 enum tcpm_transmit_type type,
867 const struct pd_message *msg)
869 unsigned long timeout;
873 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
875 tcpm_log(port, "PD TX, type: %#x", type);
877 reinit_completion(&port->tx_complete);
878 ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
882 mutex_unlock(&port->lock);
883 timeout = wait_for_completion_timeout(&port->tx_complete,
884 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
885 mutex_lock(&port->lock);
889 switch (port->tx_status) {
890 case TCPC_TX_SUCCESS:
891 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
893 * USB PD rev 2.0, 8.3.2.2.1:
894 * USB PD rev 3.0, 8.3.2.1.3:
895 * "... Note that every AMS is Interruptible until the first
896 * Message in the sequence has been successfully sent (GoodCRC
897 * Message received)."
899 if (port->ams != NONE_AMS)
902 case TCPC_TX_DISCARDED:
911 /* Some AMS don't expect responses. Finish them here. */
912 if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
913 tcpm_ams_finish(port);
918 void tcpm_pd_transmit_complete(struct tcpm_port *port,
919 enum tcpm_transmit_status status)
921 tcpm_log(port, "PD TX complete, status: %u", status);
922 port->tx_status = status;
923 complete(&port->tx_complete);
925 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
927 static int tcpm_mux_set(struct tcpm_port *port, int state,
928 enum usb_role usb_role,
929 enum typec_orientation orientation)
933 tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
934 state, usb_role, orientation);
936 ret = typec_set_orientation(port->typec_port, orientation);
941 ret = usb_role_switch_set_role(port->role_sw, usb_role);
946 return typec_set_mode(port->typec_port, state);
949 static int tcpm_set_polarity(struct tcpm_port *port,
950 enum typec_cc_polarity polarity)
954 tcpm_log(port, "polarity %d", polarity);
956 ret = port->tcpc->set_polarity(port->tcpc, polarity);
960 port->polarity = polarity;
965 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
969 tcpm_log(port, "vconn:=%d", enable);
971 ret = port->tcpc->set_vconn(port->tcpc, enable);
973 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
974 typec_set_vconn_role(port->typec_port, port->vconn_role);
980 static u32 tcpm_get_current_limit(struct tcpm_port *port)
982 enum typec_cc_status cc;
985 cc = port->polarity ? port->cc2 : port->cc1;
987 case TYPEC_CC_RP_1_5:
990 case TYPEC_CC_RP_3_0:
993 case TYPEC_CC_RP_DEF:
995 if (port->tcpc->get_current_limit)
996 limit = port->tcpc->get_current_limit(port->tcpc);
1005 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
1007 int ret = -EOPNOTSUPP;
1009 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
1011 port->supply_voltage = mv;
1012 port->current_limit = max_ma;
1013 power_supply_changed(port->psy);
1015 if (port->tcpc->set_current_limit)
1016 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
1021 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
1023 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
1027 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
1028 enum typec_role role, enum typec_data_role data)
1030 enum typec_orientation orientation;
1031 enum usb_role usb_role;
1034 if (port->polarity == TYPEC_POLARITY_CC1)
1035 orientation = TYPEC_ORIENTATION_NORMAL;
1037 orientation = TYPEC_ORIENTATION_REVERSE;
1039 if (port->typec_caps.data == TYPEC_PORT_DRD) {
1040 if (data == TYPEC_HOST)
1041 usb_role = USB_ROLE_HOST;
1043 usb_role = USB_ROLE_DEVICE;
1044 } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1045 if (data == TYPEC_HOST) {
1046 if (role == TYPEC_SOURCE)
1047 usb_role = USB_ROLE_HOST;
1049 usb_role = USB_ROLE_NONE;
1054 if (data == TYPEC_DEVICE) {
1055 if (role == TYPEC_SINK)
1056 usb_role = USB_ROLE_DEVICE;
1058 usb_role = USB_ROLE_NONE;
1064 ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1068 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1072 port->pwr_role = role;
1073 port->data_role = data;
1074 typec_set_data_role(port->typec_port, data);
1075 typec_set_pwr_role(port->typec_port, role);
1080 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1084 ret = port->tcpc->set_roles(port->tcpc, true, role,
1089 port->pwr_role = role;
1090 typec_set_pwr_role(port->typec_port, role);
1096 * Transform the PDO to be compliant to PD rev2.0.
1097 * Return 0 if the PDO type is not defined in PD rev2.0.
1098 * Otherwise, return the converted PDO.
1100 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1102 switch (pdo_type(pdo)) {
1103 case PDO_TYPE_FIXED:
1104 if (role == TYPEC_SINK)
1105 return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1107 return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1117 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1119 struct pd_message msg;
1121 unsigned int i, nr_pdo = 0;
1123 memset(&msg, 0, sizeof(msg));
1125 for (i = 0; i < port->nr_src_pdo; i++) {
1126 if (port->negotiated_rev >= PD_REV30) {
1127 msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
1129 pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1131 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1136 /* No source capabilities defined, sink only */
1137 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1140 port->negotiated_rev,
1141 port->message_id, 0);
1143 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1146 port->negotiated_rev,
1151 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1154 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1156 struct pd_message msg;
1158 unsigned int i, nr_pdo = 0;
1160 memset(&msg, 0, sizeof(msg));
1162 for (i = 0; i < port->nr_snk_pdo; i++) {
1163 if (port->negotiated_rev >= PD_REV30) {
1164 msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
1166 pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1168 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1173 /* No sink capabilities defined, source only */
1174 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1177 port->negotiated_rev,
1178 port->message_id, 0);
1180 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1183 port->negotiated_rev,
1188 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1191 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1194 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1196 hrtimer_cancel(&port->state_machine_timer);
1197 kthread_queue_work(port->wq, &port->state_machine);
1201 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1204 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1207 hrtimer_cancel(&port->vdm_state_machine_timer);
1208 kthread_queue_work(port->wq, &port->vdm_state_machine);
1212 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1215 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1217 hrtimer_cancel(&port->enable_frs_timer);
1218 kthread_queue_work(port->wq, &port->enable_frs);
1222 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1225 hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1227 hrtimer_cancel(&port->send_discover_timer);
1228 kthread_queue_work(port->wq, &port->send_discover_work);
1232 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1233 unsigned int delay_ms)
1236 tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1237 tcpm_states[port->state], tcpm_states[state], delay_ms,
1238 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1239 port->delayed_state = state;
1240 mod_tcpm_delayed_work(port, delay_ms);
1241 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1242 port->delay_ms = delay_ms;
1244 tcpm_log(port, "state change %s -> %s [%s %s]",
1245 tcpm_states[port->state], tcpm_states[state],
1246 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1247 port->delayed_state = INVALID_STATE;
1248 port->prev_state = port->state;
1249 port->state = state;
1251 * Don't re-queue the state machine work item if we're currently
1252 * in the state machine and we're immediately changing states.
1253 * tcpm_state_machine_work() will continue running the state
1256 if (!port->state_machine_running)
1257 mod_tcpm_delayed_work(port, 0);
1261 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1262 unsigned int delay_ms)
1264 if (port->enter_state == port->state)
1265 tcpm_set_state(port, state, delay_ms);
1268 "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1269 delay_ms ? "delayed " : "",
1270 tcpm_states[port->state], tcpm_states[state],
1271 delay_ms, tcpm_states[port->enter_state],
1272 pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1275 static void tcpm_queue_message(struct tcpm_port *port,
1276 enum pd_msg_request message)
1278 port->queued_message = message;
1279 mod_tcpm_delayed_work(port, 0);
1282 static bool tcpm_vdm_ams(struct tcpm_port *port)
1284 switch (port->ams) {
1285 case DISCOVER_IDENTITY:
1286 case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1287 case DISCOVER_SVIDS:
1288 case DISCOVER_MODES:
1289 case DFP_TO_UFP_ENTER_MODE:
1290 case DFP_TO_UFP_EXIT_MODE:
1291 case DFP_TO_CABLE_PLUG_ENTER_MODE:
1292 case DFP_TO_CABLE_PLUG_EXIT_MODE:
1294 case UNSTRUCTURED_VDMS:
1295 case STRUCTURED_VDMS:
1304 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1306 switch (port->ams) {
1307 /* Interruptible AMS */
1310 case FIRMWARE_UPDATE:
1311 case DISCOVER_IDENTITY:
1312 case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1313 case DISCOVER_SVIDS:
1314 case DISCOVER_MODES:
1315 case DFP_TO_UFP_ENTER_MODE:
1316 case DFP_TO_UFP_EXIT_MODE:
1317 case DFP_TO_CABLE_PLUG_ENTER_MODE:
1318 case DFP_TO_CABLE_PLUG_EXIT_MODE:
1319 case UNSTRUCTURED_VDMS:
1320 case STRUCTURED_VDMS:
1324 /* Non-Interruptible AMS */
1334 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1338 tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1340 if (!tcpm_ams_interruptible(port) &&
1341 !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1342 port->upcoming_state = INVALID_STATE;
1343 tcpm_log(port, "AMS %s not interruptible, aborting",
1344 tcpm_ams_str[port->ams]);
1348 if (port->pwr_role == TYPEC_SOURCE) {
1349 enum typec_cc_status cc_req = port->cc_req;
1353 if (ams == HARD_RESET) {
1354 tcpm_set_cc(port, tcpm_rp_cc(port));
1355 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1356 tcpm_set_state(port, HARD_RESET_START, 0);
1358 } else if (ams == SOFT_RESET_AMS) {
1359 if (!port->explicit_contract)
1360 tcpm_set_cc(port, tcpm_rp_cc(port));
1361 tcpm_set_state(port, SOFT_RESET_SEND, 0);
1363 } else if (tcpm_vdm_ams(port)) {
1364 /* tSinkTx is enforced in vdm_run_state_machine */
1365 if (port->negotiated_rev >= PD_REV30)
1366 tcpm_set_cc(port, SINK_TX_NG);
1370 if (port->negotiated_rev >= PD_REV30)
1371 tcpm_set_cc(port, SINK_TX_NG);
1373 switch (port->state) {
1376 case SRC_SOFT_RESET_WAIT_SNK_TX:
1378 case SOFT_RESET_SEND:
1379 if (port->negotiated_rev >= PD_REV30)
1380 tcpm_set_state(port, AMS_START,
1381 cc_req == SINK_TX_OK ?
1384 tcpm_set_state(port, AMS_START, 0);
1387 if (port->negotiated_rev >= PD_REV30)
1388 tcpm_set_state(port, SRC_READY,
1389 cc_req == SINK_TX_OK ?
1392 tcpm_set_state(port, SRC_READY, 0);
1396 if (port->negotiated_rev >= PD_REV30 &&
1397 !tcpm_sink_tx_ok(port) &&
1398 ams != SOFT_RESET_AMS &&
1399 ams != HARD_RESET) {
1400 port->upcoming_state = INVALID_STATE;
1401 tcpm_log(port, "Sink TX No Go");
1407 if (ams == HARD_RESET) {
1408 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1409 tcpm_set_state(port, HARD_RESET_START, 0);
1411 } else if (tcpm_vdm_ams(port)) {
1415 if (port->state == SNK_READY ||
1416 port->state == SNK_SOFT_RESET)
1417 tcpm_set_state(port, AMS_START, 0);
1419 tcpm_set_state(port, SNK_READY, 0);
1426 * VDM/VDO handling functions
1428 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1429 const u32 *data, int cnt)
1431 WARN_ON(!mutex_is_locked(&port->lock));
1433 /* Make sure we are not still processing a previous VDM packet */
1434 WARN_ON(port->vdm_state > VDM_STATE_DONE);
1436 port->vdo_count = cnt + 1;
1437 port->vdo_data[0] = header;
1438 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1439 /* Set ready, vdm state machine will actually send */
1440 port->vdm_retries = 0;
1441 port->vdm_state = VDM_STATE_READY;
1442 port->vdm_sm_running = true;
1444 mod_vdm_delayed_work(port, 0);
1447 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1448 const u32 *data, int cnt)
1450 mutex_lock(&port->lock);
1451 tcpm_queue_vdm(port, header, data, cnt);
1452 mutex_unlock(&port->lock);
1455 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1457 u32 vdo = p[VDO_INDEX_IDH];
1458 u32 product = p[VDO_INDEX_PRODUCT];
1460 memset(&port->mode_data, 0, sizeof(port->mode_data));
1462 port->partner_ident.id_header = vdo;
1463 port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1464 port->partner_ident.product = product;
1466 typec_partner_set_identity(port->partner);
1468 tcpm_log(port, "Identity: %04x:%04x.%04x",
1470 PD_PRODUCT_PID(product), product & 0xffff);
1473 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1475 struct pd_mode_data *pmdata = &port->mode_data;
1478 for (i = 1; i < cnt; i++) {
1481 svid = (p[i] >> 16) & 0xffff;
1485 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1488 pmdata->svids[pmdata->nsvids++] = svid;
1489 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1491 svid = p[i] & 0xffff;
1495 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1498 pmdata->svids[pmdata->nsvids++] = svid;
1499 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1503 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1507 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1509 struct pd_mode_data *pmdata = &port->mode_data;
1510 struct typec_altmode_desc *paltmode;
1513 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1514 /* Already logged in svdm_consume_svids() */
1518 for (i = 1; i < cnt; i++) {
1519 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1520 memset(paltmode, 0, sizeof(*paltmode));
1522 paltmode->svid = pmdata->svids[pmdata->svid_index];
1524 paltmode->vdo = p[i];
1526 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1527 pmdata->altmodes, paltmode->svid,
1528 paltmode->mode, paltmode->vdo);
1534 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1536 struct pd_mode_data *modep = &port->mode_data;
1537 struct typec_altmode *altmode;
1540 for (i = 0; i < modep->altmodes; i++) {
1541 altmode = typec_partner_register_altmode(port->partner,
1542 &modep->altmode_desc[i]);
1543 if (IS_ERR(altmode)) {
1544 tcpm_log(port, "Failed to register partner SVID 0x%04x",
1545 modep->altmode_desc[i].svid);
1548 port->partner_altmode[i] = altmode;
1552 #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1554 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1555 const u32 *p, int cnt, u32 *response,
1556 enum adev_actions *adev_action)
1558 struct typec_port *typec = port->typec_port;
1559 struct typec_altmode *pdev;
1560 struct pd_mode_data *modep;
1567 cmd_type = PD_VDO_CMDT(p[0]);
1568 cmd = PD_VDO_CMD(p[0]);
1570 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1571 p[0], cmd_type, cmd, cnt);
1573 modep = &port->mode_data;
1575 pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1576 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1578 svdm_version = typec_get_negotiated_svdm_version(typec);
1579 if (svdm_version < 0)
1585 case CMD_DISCOVER_IDENT:
1586 if (PD_VDO_VID(p[0]) != USB_SID_PD)
1589 if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1590 typec_partner_set_svdm_version(port->partner,
1591 PD_VDO_SVDM_VER(p[0]));
1592 svdm_version = PD_VDO_SVDM_VER(p[0]);
1595 port->ams = DISCOVER_IDENTITY;
1597 * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1598 * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1599 * "wrong configuation" or "Unrecognized"
1601 if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1603 if (svdm_version < SVDM_VER_2_0) {
1604 for (i = 0; i < port->nr_snk_vdo_v1; i++)
1605 response[i + 1] = port->snk_vdo_v1[i];
1606 rlen = port->nr_snk_vdo_v1 + 1;
1609 for (i = 0; i < port->nr_snk_vdo; i++)
1610 response[i + 1] = port->snk_vdo[i];
1611 rlen = port->nr_snk_vdo + 1;
1615 case CMD_DISCOVER_SVID:
1616 port->ams = DISCOVER_SVIDS;
1618 case CMD_DISCOVER_MODES:
1619 port->ams = DISCOVER_MODES;
1621 case CMD_ENTER_MODE:
1622 port->ams = DFP_TO_UFP_ENTER_MODE;
1625 port->ams = DFP_TO_UFP_EXIT_MODE;
1628 /* Attention command does not have response */
1629 *adev_action = ADEV_ATTENTION;
1635 response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1636 } else if (rlen == 0) {
1637 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1640 response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1643 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1644 (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1647 /* silently drop message if we are not connected */
1648 if (IS_ERR_OR_NULL(port->partner))
1651 tcpm_ams_finish(port);
1654 case CMD_DISCOVER_IDENT:
1655 if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1656 typec_partner_set_svdm_version(port->partner,
1657 PD_VDO_SVDM_VER(p[0]));
1659 svdm_consume_identity(port, p, cnt);
1660 response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1664 case CMD_DISCOVER_SVID:
1666 if (svdm_consume_svids(port, p, cnt)) {
1667 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1669 } else if (modep->nsvids && supports_modal(port)) {
1670 response[0] = VDO(modep->svids[0], 1, svdm_version,
1671 CMD_DISCOVER_MODES);
1675 case CMD_DISCOVER_MODES:
1677 svdm_consume_modes(port, p, cnt);
1678 modep->svid_index++;
1679 if (modep->svid_index < modep->nsvids) {
1680 u16 svid = modep->svids[modep->svid_index];
1681 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1684 tcpm_register_partner_altmodes(port);
1687 case CMD_ENTER_MODE:
1689 typec_altmode_update_active(pdev, true);
1690 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1695 typec_altmode_update_active(pdev, false);
1696 /* Back to USB Operation */
1697 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1701 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1704 /* Unrecognized SVDM */
1705 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1707 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1708 (VDO_SVDM_VERS(svdm_version));
1713 tcpm_ams_finish(port);
1715 case CMD_DISCOVER_IDENT:
1716 case CMD_DISCOVER_SVID:
1717 case CMD_DISCOVER_MODES:
1718 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1720 case CMD_ENTER_MODE:
1721 /* Back to USB Operation */
1722 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1725 /* Unrecognized SVDM */
1726 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1728 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1729 (VDO_SVDM_VERS(svdm_version));
1734 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1736 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1737 (VDO_SVDM_VERS(svdm_version));
1741 /* Informing the alternate mode drivers about everything */
1742 *adev_action = ADEV_QUEUE_VDM;
1746 static void tcpm_pd_handle_msg(struct tcpm_port *port,
1747 enum pd_msg_request message,
1750 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1751 const __le32 *payload, int cnt)
1753 enum adev_actions adev_action = ADEV_NONE;
1754 struct typec_altmode *adev;
1755 u32 p[PD_MAX_PAYLOAD];
1756 u32 response[8] = { };
1759 for (i = 0; i < cnt; i++)
1760 p[i] = le32_to_cpu(payload[i]);
1762 adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1763 PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1765 if (port->vdm_state == VDM_STATE_BUSY) {
1766 /* If UFP responded busy retry after timeout */
1767 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1768 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1769 port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1771 mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1774 port->vdm_state = VDM_STATE_DONE;
1777 if (PD_VDO_SVDM(p[0]) && (adev || tcpm_vdm_ams(port) || port->nr_snk_vdo)) {
1779 * Here a SVDM is received (INIT or RSP or unknown). Set the vdm_sm_running in
1780 * advance because we are dropping the lock but may send VDMs soon.
1781 * For the cases of INIT received:
1782 * - If no response to send, it will be cleared later in this function.
1783 * - If there are responses to send, it will be cleared in the state machine.
1784 * For the cases of RSP received:
1785 * - If no further INIT to send, it will be cleared later in this function.
1786 * - Otherwise, it will be cleared in the state machine if timeout or it will go
1787 * back here until no further INIT to send.
1788 * For the cases of unknown type received:
1789 * - We will send NAK and the flag will be cleared in the state machine.
1791 port->vdm_sm_running = true;
1792 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1794 if (port->negotiated_rev >= PD_REV30)
1795 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
1799 * We are done with any state stored in the port struct now, except
1800 * for any port struct changes done by the tcpm_queue_vdm() call
1801 * below, which is a separate operation.
1803 * So we can safely release the lock here; and we MUST release the
1804 * lock here to avoid an AB BA lock inversion:
1806 * If we keep the lock here then the lock ordering in this path is:
1807 * 1. tcpm_pd_rx_handler take the tcpm port lock
1808 * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1810 * And we also have this ordering:
1811 * 1. alt-mode driver takes the alt-mode's lock
1812 * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1815 * Dropping our lock here avoids this.
1817 mutex_unlock(&port->lock);
1820 switch (adev_action) {
1823 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1824 WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1825 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1827 case ADEV_QUEUE_VDM:
1828 typec_altmode_vdm(adev, p[0], &p[1], cnt);
1830 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1831 if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1832 int svdm_version = typec_get_negotiated_svdm_version(
1834 if (svdm_version < 0)
1837 response[0] = VDO(adev->svid, 1, svdm_version,
1839 response[0] |= VDO_OPOS(adev->mode);
1843 case ADEV_ATTENTION:
1844 typec_altmode_attention(adev, p[1]);
1850 * We must re-take the lock here to balance the unlock in
1851 * tcpm_pd_rx_handler, note that no changes, other then the
1852 * tcpm_queue_vdm call, are made while the lock is held again.
1853 * All that is done after the call is unwinding the call stack until
1854 * we return to tcpm_pd_rx_handler and do the unlock there.
1856 mutex_lock(&port->lock);
1859 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1861 port->vdm_sm_running = false;
1864 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1865 const u32 *data, int count)
1867 int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1870 if (svdm_version < 0)
1873 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1874 count = VDO_MAX_SIZE - 1;
1876 /* set VDM header with VID & CMD */
1877 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1878 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1880 tcpm_queue_vdm(port, header, data, count);
1883 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1885 unsigned int timeout;
1886 int cmd = PD_VDO_CMD(vdm_hdr);
1888 /* its not a structured VDM command */
1889 if (!PD_VDO_SVDM(vdm_hdr))
1890 return PD_T_VDM_UNSTRUCTURED;
1892 switch (PD_VDO_CMDT(vdm_hdr)) {
1894 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1895 timeout = PD_T_VDM_WAIT_MODE_E;
1897 timeout = PD_T_VDM_SNDR_RSP;
1900 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1901 timeout = PD_T_VDM_E_MODE;
1903 timeout = PD_T_VDM_RCVR_RSP;
1909 static void vdm_run_state_machine(struct tcpm_port *port)
1911 struct pd_message msg;
1913 u32 vdo_hdr = port->vdo_data[0];
1915 switch (port->vdm_state) {
1916 case VDM_STATE_READY:
1917 /* Only transmit VDM if attached */
1918 if (!port->attached) {
1919 port->vdm_state = VDM_STATE_ERR_BUSY;
1924 * if there's traffic or we're not in PDO ready state don't send
1927 if (port->state != SRC_READY && port->state != SNK_READY) {
1928 port->vdm_sm_running = false;
1932 /* TODO: AMS operation for Unstructured VDM */
1933 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1934 switch (PD_VDO_CMD(vdo_hdr)) {
1935 case CMD_DISCOVER_IDENT:
1936 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1938 port->send_discover = false;
1939 else if (res == -EAGAIN)
1940 mod_send_discover_delayed_work(port,
1941 SEND_DISCOVER_RETRY_MS);
1943 case CMD_DISCOVER_SVID:
1944 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1946 case CMD_DISCOVER_MODES:
1947 res = tcpm_ams_start(port, DISCOVER_MODES);
1949 case CMD_ENTER_MODE:
1950 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1953 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1956 res = tcpm_ams_start(port, ATTENTION);
1958 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1959 res = tcpm_ams_start(port, STRUCTURED_VDMS);
1967 port->vdm_state = VDM_STATE_ERR_BUSY;
1972 port->vdm_state = VDM_STATE_SEND_MESSAGE;
1973 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
1974 port->pwr_role == TYPEC_SOURCE &&
1975 PD_VDO_SVDM(vdo_hdr) &&
1976 PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
1979 case VDM_STATE_WAIT_RSP_BUSY:
1980 port->vdo_data[0] = port->vdo_retry;
1981 port->vdo_count = 1;
1982 port->vdm_state = VDM_STATE_READY;
1983 tcpm_ams_finish(port);
1985 case VDM_STATE_BUSY:
1986 port->vdm_state = VDM_STATE_ERR_TMOUT;
1987 if (port->ams != NONE_AMS)
1988 tcpm_ams_finish(port);
1990 case VDM_STATE_ERR_SEND:
1992 * A partner which does not support USB PD will not reply,
1993 * so this is not a fatal error. At the same time, some
1994 * devices may not return GoodCRC under some circumstances,
1995 * so we need to retry.
1997 if (port->vdm_retries < 3) {
1998 tcpm_log(port, "VDM Tx error, retry");
1999 port->vdm_retries++;
2000 port->vdm_state = VDM_STATE_READY;
2001 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
2002 tcpm_ams_finish(port);
2004 tcpm_ams_finish(port);
2007 case VDM_STATE_SEND_MESSAGE:
2008 /* Prepare and send VDM */
2009 memset(&msg, 0, sizeof(msg));
2010 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
2013 port->negotiated_rev,
2014 port->message_id, port->vdo_count);
2015 for (i = 0; i < port->vdo_count; i++)
2016 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
2017 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2019 port->vdm_state = VDM_STATE_ERR_SEND;
2021 unsigned long timeout;
2023 port->vdm_retries = 0;
2024 port->vdm_state = VDM_STATE_BUSY;
2025 timeout = vdm_ready_timeout(vdo_hdr);
2026 mod_vdm_delayed_work(port, timeout);
2034 static void vdm_state_machine_work(struct kthread_work *work)
2036 struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
2037 enum vdm_states prev_state;
2039 mutex_lock(&port->lock);
2042 * Continue running as long as the port is not busy and there was
2046 prev_state = port->vdm_state;
2047 vdm_run_state_machine(port);
2048 } while (port->vdm_state != prev_state &&
2049 port->vdm_state != VDM_STATE_BUSY &&
2050 port->vdm_state != VDM_STATE_SEND_MESSAGE);
2052 if (port->vdm_state < VDM_STATE_READY)
2053 port->vdm_sm_running = false;
2055 mutex_unlock(&port->lock);
2061 PDO_ERR_VSAFE5V_NOT_FIRST,
2062 PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2063 PDO_ERR_FIXED_NOT_SORTED,
2064 PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2066 PDO_ERR_PPS_APDO_NOT_SORTED,
2067 PDO_ERR_DUPE_PPS_APDO,
2070 static const char * const pdo_err_msg[] = {
2071 [PDO_ERR_NO_VSAFE5V] =
2072 " err: source/sink caps should at least have vSafe5V",
2073 [PDO_ERR_VSAFE5V_NOT_FIRST] =
2074 " err: vSafe5V Fixed Supply Object Shall always be the first object",
2075 [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2076 " err: PDOs should be in the following order: Fixed; Battery; Variable",
2077 [PDO_ERR_FIXED_NOT_SORTED] =
2078 " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2079 [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2080 " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2081 [PDO_ERR_DUPE_PDO] =
2082 " err: Variable/Batt supply pdos cannot have same min/max voltage",
2083 [PDO_ERR_PPS_APDO_NOT_SORTED] =
2084 " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2085 [PDO_ERR_DUPE_PPS_APDO] =
2086 " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2089 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2090 unsigned int nr_pdo)
2094 /* Should at least contain vSafe5v */
2096 return PDO_ERR_NO_VSAFE5V;
2098 /* The vSafe5V Fixed Supply Object Shall always be the first object */
2099 if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2100 pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2101 return PDO_ERR_VSAFE5V_NOT_FIRST;
2103 for (i = 1; i < nr_pdo; i++) {
2104 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2105 return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2106 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2107 enum pd_pdo_type type = pdo_type(pdo[i]);
2111 * The remaining Fixed Supply Objects, if
2112 * present, shall be sent in voltage order;
2113 * lowest to highest.
2115 case PDO_TYPE_FIXED:
2116 if (pdo_fixed_voltage(pdo[i]) <=
2117 pdo_fixed_voltage(pdo[i - 1]))
2118 return PDO_ERR_FIXED_NOT_SORTED;
2121 * The Battery Supply Objects and Variable
2122 * supply, if present shall be sent in Minimum
2123 * Voltage order; lowest to highest.
2127 if (pdo_min_voltage(pdo[i]) <
2128 pdo_min_voltage(pdo[i - 1]))
2129 return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2130 else if ((pdo_min_voltage(pdo[i]) ==
2131 pdo_min_voltage(pdo[i - 1])) &&
2132 (pdo_max_voltage(pdo[i]) ==
2133 pdo_max_voltage(pdo[i - 1])))
2134 return PDO_ERR_DUPE_PDO;
2137 * The Programmable Power Supply APDOs, if present,
2138 * shall be sent in Maximum Voltage order;
2139 * lowest to highest.
2142 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2145 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2146 pdo_pps_apdo_max_voltage(pdo[i - 1]))
2147 return PDO_ERR_PPS_APDO_NOT_SORTED;
2148 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2149 pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2150 pdo_pps_apdo_max_voltage(pdo[i]) ==
2151 pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2152 pdo_pps_apdo_max_current(pdo[i]) ==
2153 pdo_pps_apdo_max_current(pdo[i - 1]))
2154 return PDO_ERR_DUPE_PPS_APDO;
2157 tcpm_log_force(port, " Unknown pdo type");
2165 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2166 unsigned int nr_pdo)
2168 enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2170 if (err_index != PDO_NO_ERR) {
2171 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2178 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2180 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2184 svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2185 if (svdm_version < 0)
2186 return svdm_version;
2188 header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2189 header |= VDO_OPOS(altmode->mode);
2191 tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2195 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2197 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2201 svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2202 if (svdm_version < 0)
2203 return svdm_version;
2205 header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2206 header |= VDO_OPOS(altmode->mode);
2208 tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2212 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2213 u32 header, const u32 *data, int count)
2215 struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2217 tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2222 static const struct typec_altmode_ops tcpm_altmode_ops = {
2223 .enter = tcpm_altmode_enter,
2224 .exit = tcpm_altmode_exit,
2225 .vdm = tcpm_altmode_vdm,
2229 * PD (data, control) command handling functions
2231 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2233 if (port->pwr_role == TYPEC_SOURCE)
2239 static int tcpm_pd_send_control(struct tcpm_port *port,
2240 enum pd_ctrl_msg_type type);
2242 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2245 u32 p0 = le32_to_cpu(payload[0]);
2246 unsigned int type = usb_pd_ado_type(p0);
2249 tcpm_log(port, "Alert message received with no type");
2250 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2254 /* Just handling non-battery alerts for now */
2255 if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2256 if (port->pwr_role == TYPEC_SOURCE) {
2257 port->upcoming_state = GET_STATUS_SEND;
2258 tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2261 * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2264 port->ams = GETTING_SOURCE_SINK_STATUS;
2265 tcpm_set_state(port, GET_STATUS_SEND, 0);
2268 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2272 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2273 enum typec_pwr_opmode mode, bool pps_active,
2274 u32 requested_vbus_voltage)
2278 if (!port->tcpc->set_auto_vbus_discharge_threshold)
2281 ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2282 requested_vbus_voltage);
2283 tcpm_log_force(port,
2284 "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2285 mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2290 static void tcpm_pd_handle_state(struct tcpm_port *port,
2291 enum tcpm_state state,
2293 unsigned int delay_ms)
2295 switch (port->state) {
2299 tcpm_set_state(port, state, delay_ms);
2301 /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2302 case SNK_TRANSITION_SINK:
2303 case SNK_TRANSITION_SINK_VBUS:
2304 case SRC_TRANSITION_SUPPLY:
2305 tcpm_set_state(port, HARD_RESET_SEND, 0);
2308 if (!tcpm_ams_interruptible(port)) {
2309 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2310 SRC_SOFT_RESET_WAIT_SNK_TX :
2314 /* process the Message 6.8.1 */
2315 port->upcoming_state = state;
2316 port->next_ams = ams;
2317 tcpm_set_state(port, ready_state(port), delay_ms);
2323 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2324 enum pd_msg_request message,
2327 switch (port->state) {
2331 tcpm_queue_message(port, message);
2333 /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2334 case SNK_TRANSITION_SINK:
2335 case SNK_TRANSITION_SINK_VBUS:
2336 case SRC_TRANSITION_SUPPLY:
2337 tcpm_set_state(port, HARD_RESET_SEND, 0);
2340 if (!tcpm_ams_interruptible(port)) {
2341 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2342 SRC_SOFT_RESET_WAIT_SNK_TX :
2346 port->next_ams = ams;
2347 tcpm_set_state(port, ready_state(port), 0);
2348 /* 6.8.1 process the Message */
2349 tcpm_queue_message(port, message);
2355 static void tcpm_pd_data_request(struct tcpm_port *port,
2356 const struct pd_message *msg)
2358 enum pd_data_msg_type type = pd_header_type_le(msg->header);
2359 unsigned int cnt = pd_header_cnt_le(msg->header);
2360 unsigned int rev = pd_header_rev_le(msg->header);
2362 enum frs_typec_current partner_frs_current;
2366 if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2367 port->vdm_state = VDM_STATE_ERR_BUSY;
2368 tcpm_ams_finish(port);
2369 mod_vdm_delayed_work(port, 0);
2373 case PD_DATA_SOURCE_CAP:
2374 for (i = 0; i < cnt; i++)
2375 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2377 port->nr_source_caps = cnt;
2379 tcpm_log_source_caps(port);
2381 tcpm_validate_caps(port, port->source_caps,
2382 port->nr_source_caps);
2385 * Adjust revision in subsequent message headers, as required,
2386 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2387 * support Rev 1.0 so just do nothing in that scenario.
2389 if (rev == PD_REV10) {
2390 if (port->ams == GET_SOURCE_CAPABILITIES)
2391 tcpm_ams_finish(port);
2395 if (rev < PD_MAX_REV)
2396 port->negotiated_rev = rev;
2398 if (port->pwr_role == TYPEC_SOURCE) {
2399 if (port->ams == GET_SOURCE_CAPABILITIES)
2400 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2401 /* Unexpected Source Capabilities */
2403 tcpm_pd_handle_msg(port,
2404 port->negotiated_rev < PD_REV30 ?
2405 PD_MSG_CTRL_REJECT :
2406 PD_MSG_CTRL_NOT_SUPP,
2408 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2410 * This message may be received even if VBUS is not
2411 * present. This is quite unexpected; see USB PD
2412 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2413 * However, at the same time, we must be ready to
2414 * receive this message and respond to it 15ms after
2415 * receiving PS_RDY during power swap operations, no matter
2416 * if VBUS is available or not (USB PD specification,
2418 * So we need to accept the message either way,
2419 * but be prepared to keep waiting for VBUS after it was
2422 port->ams = POWER_NEGOTIATION;
2423 port->in_ams = true;
2424 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2426 if (port->ams == GET_SOURCE_CAPABILITIES)
2427 tcpm_ams_finish(port);
2428 tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2429 POWER_NEGOTIATION, 0);
2432 case PD_DATA_REQUEST:
2434 * Adjust revision in subsequent message headers, as required,
2435 * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2436 * support Rev 1.0 so just reject in that scenario.
2438 if (rev == PD_REV10) {
2439 tcpm_pd_handle_msg(port,
2440 port->negotiated_rev < PD_REV30 ?
2441 PD_MSG_CTRL_REJECT :
2442 PD_MSG_CTRL_NOT_SUPP,
2447 if (rev < PD_MAX_REV)
2448 port->negotiated_rev = rev;
2450 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2451 tcpm_pd_handle_msg(port,
2452 port->negotiated_rev < PD_REV30 ?
2453 PD_MSG_CTRL_REJECT :
2454 PD_MSG_CTRL_NOT_SUPP,
2459 port->sink_request = le32_to_cpu(msg->payload[0]);
2461 if (port->vdm_sm_running && port->explicit_contract) {
2462 tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2466 if (port->state == SRC_SEND_CAPABILITIES)
2467 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2469 tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2470 POWER_NEGOTIATION, 0);
2472 case PD_DATA_SINK_CAP:
2473 /* We don't do anything with this at the moment... */
2474 for (i = 0; i < cnt; i++)
2475 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2477 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2478 PDO_FIXED_FRS_CURR_SHIFT;
2479 frs_enable = partner_frs_current && (partner_frs_current <=
2480 port->new_source_frs_current);
2482 "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2483 partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2485 ret = port->tcpc->enable_frs(port->tcpc, true);
2486 tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2489 port->nr_sink_caps = cnt;
2490 port->sink_cap_done = true;
2491 if (port->ams == GET_SINK_CAPABILITIES)
2492 tcpm_set_state(port, ready_state(port), 0);
2493 /* Unexpected Sink Capabilities */
2495 tcpm_pd_handle_msg(port,
2496 port->negotiated_rev < PD_REV30 ?
2497 PD_MSG_CTRL_REJECT :
2498 PD_MSG_CTRL_NOT_SUPP,
2501 case PD_DATA_VENDOR_DEF:
2502 tcpm_handle_vdm_request(port, msg->payload, cnt);
2505 port->bist_request = le32_to_cpu(msg->payload[0]);
2506 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2509 if (port->state != SRC_READY && port->state != SNK_READY)
2510 tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2511 SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2514 tcpm_handle_alert(port, msg->payload, cnt);
2516 case PD_DATA_BATT_STATUS:
2517 case PD_DATA_GET_COUNTRY_INFO:
2518 /* Currently unsupported */
2519 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2520 PD_MSG_CTRL_REJECT :
2521 PD_MSG_CTRL_NOT_SUPP,
2525 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2526 PD_MSG_CTRL_REJECT :
2527 PD_MSG_CTRL_NOT_SUPP,
2529 tcpm_log(port, "Unrecognized data message type %#x", type);
2534 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2536 if (port->pps_pending) {
2537 port->pps_status = result;
2538 port->pps_pending = false;
2539 complete(&port->pps_complete);
2543 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2544 const struct pd_message *msg)
2546 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2547 enum tcpm_state next_state;
2550 * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2551 * VDM AMS if waiting for VDM responses and will be handled later.
2553 if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2554 port->vdm_state = VDM_STATE_ERR_BUSY;
2555 tcpm_ams_finish(port);
2556 mod_vdm_delayed_work(port, 0);
2560 case PD_CTRL_GOOD_CRC:
2563 case PD_CTRL_GET_SOURCE_CAP:
2564 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2566 case PD_CTRL_GET_SINK_CAP:
2567 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2569 case PD_CTRL_GOTO_MIN:
2571 case PD_CTRL_PS_RDY:
2572 switch (port->state) {
2573 case SNK_TRANSITION_SINK:
2574 if (port->vbus_present) {
2575 tcpm_set_current_limit(port,
2576 port->req_current_limit,
2577 port->req_supply_voltage);
2578 port->explicit_contract = true;
2579 tcpm_set_auto_vbus_discharge_threshold(port,
2581 port->pps_data.active,
2582 port->supply_voltage);
2583 tcpm_set_state(port, SNK_READY, 0);
2586 * Seen after power swap. Keep waiting for VBUS
2587 * in a transitional state.
2589 tcpm_set_state(port,
2590 SNK_TRANSITION_SINK_VBUS, 0);
2593 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2594 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2596 case PR_SWAP_SNK_SRC_SINK_OFF:
2597 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2599 case VCONN_SWAP_WAIT_FOR_VCONN:
2600 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2602 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2603 tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2606 tcpm_pd_handle_state(port,
2607 port->pwr_role == TYPEC_SOURCE ?
2608 SRC_SOFT_RESET_WAIT_SNK_TX :
2614 case PD_CTRL_REJECT:
2616 case PD_CTRL_NOT_SUPP:
2617 switch (port->state) {
2618 case SNK_NEGOTIATE_CAPABILITIES:
2619 /* USB PD specification, Figure 8-43 */
2620 if (port->explicit_contract)
2621 next_state = SNK_READY;
2623 next_state = SNK_WAIT_CAPABILITIES;
2625 /* Threshold was relaxed before sending Request. Restore it back. */
2626 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2627 port->pps_data.active,
2628 port->supply_voltage);
2629 tcpm_set_state(port, next_state, 0);
2631 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2632 /* Revert data back from any requested PPS updates */
2633 port->pps_data.req_out_volt = port->supply_voltage;
2634 port->pps_data.req_op_curr = port->current_limit;
2635 port->pps_status = (type == PD_CTRL_WAIT ?
2636 -EAGAIN : -EOPNOTSUPP);
2638 /* Threshold was relaxed before sending Request. Restore it back. */
2639 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
2640 port->pps_data.active,
2641 port->supply_voltage);
2643 tcpm_set_state(port, SNK_READY, 0);
2646 port->swap_status = (type == PD_CTRL_WAIT ?
2647 -EAGAIN : -EOPNOTSUPP);
2648 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2651 port->swap_status = (type == PD_CTRL_WAIT ?
2652 -EAGAIN : -EOPNOTSUPP);
2653 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2655 case VCONN_SWAP_SEND:
2656 port->swap_status = (type == PD_CTRL_WAIT ?
2657 -EAGAIN : -EOPNOTSUPP);
2658 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2661 tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2664 port->sink_cap_done = true;
2665 tcpm_set_state(port, ready_state(port), 0);
2669 if (port->vdm_state > VDM_STATE_READY) {
2670 port->vdm_state = VDM_STATE_DONE;
2671 if (tcpm_vdm_ams(port))
2672 tcpm_ams_finish(port);
2673 mod_vdm_delayed_work(port, 0);
2678 tcpm_pd_handle_state(port,
2679 port->pwr_role == TYPEC_SOURCE ?
2680 SRC_SOFT_RESET_WAIT_SNK_TX :
2686 case PD_CTRL_ACCEPT:
2687 switch (port->state) {
2688 case SNK_NEGOTIATE_CAPABILITIES:
2689 port->pps_data.active = false;
2690 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2692 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2693 port->pps_data.active = true;
2694 port->pps_data.min_volt = port->pps_data.req_min_volt;
2695 port->pps_data.max_volt = port->pps_data.req_max_volt;
2696 port->pps_data.max_curr = port->pps_data.req_max_curr;
2697 port->req_supply_voltage = port->pps_data.req_out_volt;
2698 port->req_current_limit = port->pps_data.req_op_curr;
2699 power_supply_changed(port->psy);
2700 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2702 case SOFT_RESET_SEND:
2703 if (port->ams == SOFT_RESET_AMS)
2704 tcpm_ams_finish(port);
2705 if (port->pwr_role == TYPEC_SOURCE) {
2706 port->upcoming_state = SRC_SEND_CAPABILITIES;
2707 tcpm_ams_start(port, POWER_NEGOTIATION);
2709 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2713 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2716 tcpm_set_state(port, PR_SWAP_START, 0);
2718 case VCONN_SWAP_SEND:
2719 tcpm_set_state(port, VCONN_SWAP_START, 0);
2722 tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2725 tcpm_pd_handle_state(port,
2726 port->pwr_role == TYPEC_SOURCE ?
2727 SRC_SOFT_RESET_WAIT_SNK_TX :
2733 case PD_CTRL_SOFT_RESET:
2734 port->ams = SOFT_RESET_AMS;
2735 tcpm_set_state(port, SOFT_RESET, 0);
2737 case PD_CTRL_DR_SWAP:
2740 * 6.3.9: If an alternate mode is active, a request to swap
2741 * alternate modes shall trigger a port reset.
2743 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2744 tcpm_pd_handle_msg(port,
2745 port->negotiated_rev < PD_REV30 ?
2746 PD_MSG_CTRL_REJECT :
2747 PD_MSG_CTRL_NOT_SUPP,
2750 if (port->send_discover) {
2751 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2755 tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2758 case PD_CTRL_PR_SWAP:
2759 if (port->port_type != TYPEC_PORT_DRP) {
2760 tcpm_pd_handle_msg(port,
2761 port->negotiated_rev < PD_REV30 ?
2762 PD_MSG_CTRL_REJECT :
2763 PD_MSG_CTRL_NOT_SUPP,
2766 if (port->send_discover) {
2767 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2771 tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2774 case PD_CTRL_VCONN_SWAP:
2775 if (port->send_discover) {
2776 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2780 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2782 case PD_CTRL_GET_SOURCE_CAP_EXT:
2783 case PD_CTRL_GET_STATUS:
2784 case PD_CTRL_FR_SWAP:
2785 case PD_CTRL_GET_PPS_STATUS:
2786 case PD_CTRL_GET_COUNTRY_CODES:
2787 /* Currently not supported */
2788 tcpm_pd_handle_msg(port,
2789 port->negotiated_rev < PD_REV30 ?
2790 PD_MSG_CTRL_REJECT :
2791 PD_MSG_CTRL_NOT_SUPP,
2795 tcpm_pd_handle_msg(port,
2796 port->negotiated_rev < PD_REV30 ?
2797 PD_MSG_CTRL_REJECT :
2798 PD_MSG_CTRL_NOT_SUPP,
2800 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2805 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2806 const struct pd_message *msg)
2808 enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2809 unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2811 /* stopping VDM state machine if interrupted by other Messages */
2812 if (tcpm_vdm_ams(port)) {
2813 port->vdm_state = VDM_STATE_ERR_BUSY;
2814 tcpm_ams_finish(port);
2815 mod_vdm_delayed_work(port, 0);
2818 if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2819 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2820 tcpm_log(port, "Unchunked extended messages unsupported");
2824 if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2825 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2826 tcpm_log(port, "Chunk handling not yet supported");
2832 case PD_EXT_PPS_STATUS:
2833 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2834 tcpm_ams_finish(port);
2835 tcpm_set_state(port, ready_state(port), 0);
2837 /* unexpected Status or PPS_Status Message */
2838 tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2839 SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2843 case PD_EXT_SOURCE_CAP_EXT:
2844 case PD_EXT_GET_BATT_CAP:
2845 case PD_EXT_GET_BATT_STATUS:
2846 case PD_EXT_BATT_CAP:
2847 case PD_EXT_GET_MANUFACTURER_INFO:
2848 case PD_EXT_MANUFACTURER_INFO:
2849 case PD_EXT_SECURITY_REQUEST:
2850 case PD_EXT_SECURITY_RESPONSE:
2851 case PD_EXT_FW_UPDATE_REQUEST:
2852 case PD_EXT_FW_UPDATE_RESPONSE:
2853 case PD_EXT_COUNTRY_INFO:
2854 case PD_EXT_COUNTRY_CODES:
2855 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2858 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2859 tcpm_log(port, "Unrecognized extended message type %#x", type);
2864 static void tcpm_pd_rx_handler(struct kthread_work *work)
2866 struct pd_rx_event *event = container_of(work,
2867 struct pd_rx_event, work);
2868 const struct pd_message *msg = &event->msg;
2869 unsigned int cnt = pd_header_cnt_le(msg->header);
2870 struct tcpm_port *port = event->port;
2872 mutex_lock(&port->lock);
2874 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2877 if (port->attached) {
2878 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2879 unsigned int msgid = pd_header_msgid_le(msg->header);
2882 * USB PD standard, 6.6.1.2:
2883 * "... if MessageID value in a received Message is the
2884 * same as the stored value, the receiver shall return a
2885 * GoodCRC Message with that MessageID value and drop
2886 * the Message (this is a retry of an already received
2887 * Message). Note: this shall not apply to the Soft_Reset
2888 * Message which always has a MessageID value of zero."
2890 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2892 port->rx_msgid = msgid;
2895 * If both ends believe to be DFP/host, we have a data role
2898 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2899 (port->data_role == TYPEC_HOST)) {
2901 "Data role mismatch, initiating error recovery");
2902 tcpm_set_state(port, ERROR_RECOVERY, 0);
2904 if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
2905 tcpm_pd_ext_msg_request(port, msg);
2907 tcpm_pd_data_request(port, msg);
2909 tcpm_pd_ctrl_request(port, msg);
2914 mutex_unlock(&port->lock);
2918 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2920 struct pd_rx_event *event;
2922 event = kzalloc(sizeof(*event), GFP_ATOMIC);
2926 kthread_init_work(&event->work, tcpm_pd_rx_handler);
2928 memcpy(&event->msg, msg, sizeof(*msg));
2929 kthread_queue_work(port->wq, &event->work);
2931 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2933 static int tcpm_pd_send_control(struct tcpm_port *port,
2934 enum pd_ctrl_msg_type type)
2936 struct pd_message msg;
2938 memset(&msg, 0, sizeof(msg));
2939 msg.header = PD_HEADER_LE(type, port->pwr_role,
2941 port->negotiated_rev,
2942 port->message_id, 0);
2944 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2948 * Send queued message without affecting state.
2949 * Return true if state machine should go back to sleep,
2952 static bool tcpm_send_queued_message(struct tcpm_port *port)
2954 enum pd_msg_request queued_message;
2958 queued_message = port->queued_message;
2959 port->queued_message = PD_MSG_NONE;
2961 switch (queued_message) {
2962 case PD_MSG_CTRL_WAIT:
2963 tcpm_pd_send_control(port, PD_CTRL_WAIT);
2965 case PD_MSG_CTRL_REJECT:
2966 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2968 case PD_MSG_CTRL_NOT_SUPP:
2969 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2971 case PD_MSG_DATA_SINK_CAP:
2972 ret = tcpm_pd_send_sink_caps(port);
2974 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
2975 tcpm_set_state(port, SNK_SOFT_RESET, 0);
2977 tcpm_ams_finish(port);
2979 case PD_MSG_DATA_SOURCE_CAP:
2980 ret = tcpm_pd_send_source_caps(port);
2983 "Unable to send src caps, ret=%d",
2985 tcpm_set_state(port, SOFT_RESET_SEND, 0);
2986 } else if (port->pwr_role == TYPEC_SOURCE) {
2987 tcpm_ams_finish(port);
2988 tcpm_set_state(port, HARD_RESET_SEND,
2989 PD_T_SENDER_RESPONSE);
2991 tcpm_ams_finish(port);
2997 } while (port->queued_message != PD_MSG_NONE);
2999 if (port->delayed_state != INVALID_STATE) {
3000 if (ktime_after(port->delayed_runtime, ktime_get())) {
3001 mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
3005 port->delayed_state = INVALID_STATE;
3010 static int tcpm_pd_check_request(struct tcpm_port *port)
3012 u32 pdo, rdo = port->sink_request;
3013 unsigned int max, op, pdo_max, index;
3014 enum pd_pdo_type type;
3016 index = rdo_index(rdo);
3017 if (!index || index > port->nr_src_pdo)
3020 pdo = port->src_pdo[index - 1];
3021 type = pdo_type(pdo);
3023 case PDO_TYPE_FIXED:
3025 max = rdo_max_current(rdo);
3026 op = rdo_op_current(rdo);
3027 pdo_max = pdo_max_current(pdo);
3031 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3034 if (type == PDO_TYPE_FIXED)
3036 "Requested %u mV, %u mA for %u / %u mA",
3037 pdo_fixed_voltage(pdo), pdo_max, op, max);
3040 "Requested %u -> %u mV, %u mA for %u / %u mA",
3041 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3045 max = rdo_max_power(rdo);
3046 op = rdo_op_power(rdo);
3047 pdo_max = pdo_max_power(pdo);
3051 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3054 "Requested %u -> %u mV, %u mW for %u / %u mW",
3055 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3062 port->op_vsafe5v = index == 1;
3067 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3068 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3070 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3073 unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3074 max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3078 port->pps_data.supported = false;
3079 port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3080 power_supply_changed(port->psy);
3083 * Select the source PDO providing the most power which has a
3086 for (i = 0; i < port->nr_source_caps; i++) {
3087 u32 pdo = port->source_caps[i];
3088 enum pd_pdo_type type = pdo_type(pdo);
3091 case PDO_TYPE_FIXED:
3092 max_src_mv = pdo_fixed_voltage(pdo);
3093 min_src_mv = max_src_mv;
3097 max_src_mv = pdo_max_voltage(pdo);
3098 min_src_mv = pdo_min_voltage(pdo);
3101 if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3102 port->pps_data.supported = true;
3104 POWER_SUPPLY_USB_TYPE_PD_PPS;
3105 power_supply_changed(port->psy);
3109 tcpm_log(port, "Invalid source PDO type, ignoring");
3114 case PDO_TYPE_FIXED:
3116 src_ma = pdo_max_current(pdo);
3117 src_mw = src_ma * min_src_mv / 1000;
3120 src_mw = pdo_max_power(pdo);
3125 tcpm_log(port, "Invalid source PDO type, ignoring");
3129 for (j = 0; j < port->nr_snk_pdo; j++) {
3130 pdo = port->snk_pdo[j];
3132 switch (pdo_type(pdo)) {
3133 case PDO_TYPE_FIXED:
3134 max_snk_mv = pdo_fixed_voltage(pdo);
3135 min_snk_mv = max_snk_mv;
3139 max_snk_mv = pdo_max_voltage(pdo);
3140 min_snk_mv = pdo_min_voltage(pdo);
3145 tcpm_log(port, "Invalid sink PDO type, ignoring");
3149 if (max_src_mv <= max_snk_mv &&
3150 min_src_mv >= min_snk_mv) {
3151 /* Prefer higher voltages if available */
3152 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3157 max_mv = min_src_mv;
3167 #define min_pps_apdo_current(x, y) \
3168 min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
3170 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3172 unsigned int i, j, max_mw = 0, max_mv = 0;
3173 unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
3174 unsigned int min_snk_mv, max_snk_mv;
3175 unsigned int max_op_mv;
3177 unsigned int src_pdo = 0, snk_pdo = 0;
3180 * Select the source PPS APDO providing the most power while staying
3181 * within the board's limits. We skip the first PDO as this is always
3184 for (i = 1; i < port->nr_source_caps; ++i) {
3185 pdo = port->source_caps[i];
3187 switch (pdo_type(pdo)) {
3189 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3190 tcpm_log(port, "Not PPS APDO (source), ignoring");
3194 min_src_mv = pdo_pps_apdo_min_voltage(pdo);
3195 max_src_mv = pdo_pps_apdo_max_voltage(pdo);
3196 src_ma = pdo_pps_apdo_max_current(pdo);
3197 src_mw = (src_ma * max_src_mv) / 1000;
3200 * Now search through the sink PDOs to find a matching
3201 * PPS APDO. Again skip the first sink PDO as this will
3204 for (j = 1; j < port->nr_snk_pdo; j++) {
3205 pdo = port->snk_pdo[j];
3207 switch (pdo_type(pdo)) {
3209 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3211 "Not PPS APDO (sink), ignoring");
3216 pdo_pps_apdo_min_voltage(pdo);
3218 pdo_pps_apdo_max_voltage(pdo);
3222 "Not APDO type (sink), ignoring");
3226 if (min_src_mv <= max_snk_mv &&
3227 max_src_mv >= min_snk_mv) {
3228 max_op_mv = min(max_src_mv, max_snk_mv);
3229 src_mw = (max_op_mv * src_ma) / 1000;
3230 /* Prefer higher voltages if available */
3231 if ((src_mw == max_mw &&
3232 max_op_mv > max_mv) ||
3244 tcpm_log(port, "Not APDO type (source), ignoring");
3250 src = port->source_caps[src_pdo];
3251 snk = port->snk_pdo[snk_pdo];
3253 port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src),
3254 pdo_pps_apdo_min_voltage(snk));
3255 port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src),
3256 pdo_pps_apdo_max_voltage(snk));
3257 port->pps_data.req_max_curr = min_pps_apdo_current(src, snk);
3258 port->pps_data.req_out_volt = min(port->pps_data.req_max_volt,
3259 max(port->pps_data.req_min_volt,
3260 port->pps_data.req_out_volt));
3261 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3262 port->pps_data.req_op_curr);
3268 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3270 unsigned int mv, ma, mw, flags;
3271 unsigned int max_ma, max_mw;
3272 enum pd_pdo_type type;
3273 u32 pdo, matching_snk_pdo;
3274 int src_pdo_index = 0;
3275 int snk_pdo_index = 0;
3278 ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3282 pdo = port->source_caps[src_pdo_index];
3283 matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3284 type = pdo_type(pdo);
3287 case PDO_TYPE_FIXED:
3288 mv = pdo_fixed_voltage(pdo);
3292 mv = pdo_min_voltage(pdo);
3295 tcpm_log(port, "Invalid PDO selected!");
3299 /* Select maximum available current within the sink pdo's limit */
3300 if (type == PDO_TYPE_BATT) {
3301 mw = min_power(pdo, matching_snk_pdo);
3302 ma = 1000 * mw / mv;
3304 ma = min_current(pdo, matching_snk_pdo);
3305 mw = ma * mv / 1000;
3308 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3310 /* Set mismatch bit if offered power is less than operating power */
3313 if (mw < port->operating_snk_mw) {
3314 flags |= RDO_CAP_MISMATCH;
3315 if (type == PDO_TYPE_BATT &&
3316 (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3317 max_mw = pdo_max_power(matching_snk_pdo);
3318 else if (pdo_max_current(matching_snk_pdo) >
3319 pdo_max_current(pdo))
3320 max_ma = pdo_max_current(matching_snk_pdo);
3323 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3324 port->cc_req, port->cc1, port->cc2, port->vbus_source,
3325 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3328 if (type == PDO_TYPE_BATT) {
3329 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3331 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3332 src_pdo_index, mv, mw,
3333 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3335 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3337 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3338 src_pdo_index, mv, ma,
3339 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3342 port->req_current_limit = ma;
3343 port->req_supply_voltage = mv;
3348 static int tcpm_pd_send_request(struct tcpm_port *port)
3350 struct pd_message msg;
3354 ret = tcpm_pd_build_request(port, &rdo);
3359 * Relax the threshold as voltage will be adjusted after Accept Message plus tSrcTransition.
3360 * It is safer to modify the threshold here.
3362 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3364 memset(&msg, 0, sizeof(msg));
3365 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3368 port->negotiated_rev,
3369 port->message_id, 1);
3370 msg.payload[0] = cpu_to_le32(rdo);
3372 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3375 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3377 unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3378 enum pd_pdo_type type;
3379 unsigned int src_pdo_index;
3382 src_pdo_index = tcpm_pd_select_pps_apdo(port);
3386 pdo = port->source_caps[src_pdo_index];
3387 type = pdo_type(pdo);
3391 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3392 tcpm_log(port, "Invalid APDO selected!");
3395 max_mv = port->pps_data.req_max_volt;
3396 max_ma = port->pps_data.req_max_curr;
3397 out_mv = port->pps_data.req_out_volt;
3398 op_ma = port->pps_data.req_op_curr;
3401 tcpm_log(port, "Invalid PDO selected!");
3405 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3407 op_mw = (op_ma * out_mv) / 1000;
3408 if (op_mw < port->operating_snk_mw) {
3410 * Try raising current to meet power needs. If that's not enough
3411 * then try upping the voltage. If that's still not enough
3412 * then we've obviously chosen a PPS APDO which really isn't
3413 * suitable so abandon ship.
3415 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3416 if ((port->operating_snk_mw * 1000) % out_mv)
3418 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3420 if (op_ma > max_ma) {
3422 out_mv = (port->operating_snk_mw * 1000) / op_ma;
3423 if ((port->operating_snk_mw * 1000) % op_ma)
3425 out_mv += RDO_PROG_VOLT_MV_STEP -
3426 (out_mv % RDO_PROG_VOLT_MV_STEP);
3428 if (out_mv > max_mv) {
3429 tcpm_log(port, "Invalid PPS APDO selected!");
3435 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3436 port->cc_req, port->cc1, port->cc2, port->vbus_source,
3437 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3440 *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3442 tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3443 src_pdo_index, out_mv, op_ma);
3445 port->pps_data.req_op_curr = op_ma;
3446 port->pps_data.req_out_volt = out_mv;
3451 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3453 struct pd_message msg;
3457 ret = tcpm_pd_build_pps_request(port, &rdo);
3461 /* Relax the threshold as voltage will be adjusted right after Accept Message. */
3462 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
3464 memset(&msg, 0, sizeof(msg));
3465 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3468 port->negotiated_rev,
3469 port->message_id, 1);
3470 msg.payload[0] = cpu_to_le32(rdo);
3472 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3475 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3479 if (enable && port->vbus_charge)
3482 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3484 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3488 port->vbus_source = enable;
3492 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3496 if (charge && port->vbus_source)
3499 if (charge != port->vbus_charge) {
3500 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3501 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3506 port->vbus_charge = charge;
3507 power_supply_changed(port->psy);
3511 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3515 if (!port->tcpc->start_toggling)
3518 tcpm_log_force(port, "Start toggling");
3519 ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3523 static int tcpm_init_vbus(struct tcpm_port *port)
3527 ret = port->tcpc->set_vbus(port->tcpc, false, false);
3528 port->vbus_source = false;
3529 port->vbus_charge = false;
3533 static int tcpm_init_vconn(struct tcpm_port *port)
3537 ret = port->tcpc->set_vconn(port->tcpc, false);
3538 port->vconn_role = TYPEC_SINK;
3542 static void tcpm_typec_connect(struct tcpm_port *port)
3544 if (!port->connected) {
3545 /* Make sure we don't report stale identity information */
3546 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3547 port->partner_desc.usb_pd = port->pd_capable;
3548 if (tcpm_port_is_debug(port))
3549 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3550 else if (tcpm_port_is_audio(port))
3551 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3553 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3554 port->partner = typec_register_partner(port->typec_port,
3555 &port->partner_desc);
3556 port->connected = true;
3560 static int tcpm_src_attach(struct tcpm_port *port)
3562 enum typec_cc_polarity polarity =
3563 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3564 : TYPEC_POLARITY_CC1;
3570 ret = tcpm_set_polarity(port, polarity);
3574 tcpm_enable_auto_vbus_discharge(port, true);
3576 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3580 if (port->pd_supported) {
3581 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3583 goto out_disable_mux;
3587 * USB Type-C specification, version 1.2,
3588 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3589 * Enable VCONN only if the non-RD port is set to RA.
3591 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3592 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3593 ret = tcpm_set_vconn(port, true);
3595 goto out_disable_pd;
3598 ret = tcpm_set_vbus(port, true);
3600 goto out_disable_vconn;
3602 port->pd_capable = false;
3604 port->partner = NULL;
3606 port->attached = true;
3607 port->send_discover = true;
3612 tcpm_set_vconn(port, false);
3614 if (port->pd_supported)
3615 port->tcpc->set_pd_rx(port->tcpc, false);
3617 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3618 TYPEC_ORIENTATION_NONE);
3622 static void tcpm_typec_disconnect(struct tcpm_port *port)
3624 if (port->connected) {
3625 typec_unregister_partner(port->partner);
3626 port->partner = NULL;
3627 port->connected = false;
3631 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3633 struct pd_mode_data *modep = &port->mode_data;
3636 for (i = 0; i < modep->altmodes; i++) {
3637 typec_unregister_altmode(port->partner_altmode[i]);
3638 port->partner_altmode[i] = NULL;
3641 memset(modep, 0, sizeof(*modep));
3644 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3646 tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3648 if (port->tcpc->set_partner_usb_comm_capable)
3649 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3652 static void tcpm_reset_port(struct tcpm_port *port)
3654 tcpm_enable_auto_vbus_discharge(port, false);
3655 port->in_ams = false;
3656 port->ams = NONE_AMS;
3657 port->vdm_sm_running = false;
3658 tcpm_unregister_altmodes(port);
3659 tcpm_typec_disconnect(port);
3660 port->attached = false;
3661 port->pd_capable = false;
3662 port->pps_data.supported = false;
3663 tcpm_set_partner_usb_comm_capable(port, false);
3666 * First Rx ID should be 0; set this to a sentinel of -1 so that
3667 * we can check tcpm_pd_rx_handler() if we had seen it before.
3669 port->rx_msgid = -1;
3671 port->tcpc->set_pd_rx(port->tcpc, false);
3672 tcpm_init_vbus(port); /* also disables charging */
3673 tcpm_init_vconn(port);
3674 tcpm_set_current_limit(port, 0, 0);
3675 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3676 tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3677 TYPEC_ORIENTATION_NONE);
3678 tcpm_set_attached_state(port, false);
3679 port->try_src_count = 0;
3680 port->try_snk_count = 0;
3681 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3682 power_supply_changed(port->psy);
3683 port->nr_sink_caps = 0;
3684 port->sink_cap_done = false;
3685 if (port->tcpc->enable_frs)
3686 port->tcpc->enable_frs(port->tcpc, false);
3689 static void tcpm_detach(struct tcpm_port *port)
3691 if (tcpm_port_is_disconnected(port))
3692 port->hard_reset_count = 0;
3694 if (!port->attached)
3697 if (port->tcpc->set_bist_data) {
3698 tcpm_log(port, "disable BIST MODE TESTDATA");
3699 port->tcpc->set_bist_data(port->tcpc, false);
3702 tcpm_reset_port(port);
3705 static void tcpm_src_detach(struct tcpm_port *port)
3710 static int tcpm_snk_attach(struct tcpm_port *port)
3717 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3718 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3722 tcpm_enable_auto_vbus_discharge(port, true);
3724 ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3728 port->pd_capable = false;
3730 port->partner = NULL;
3732 port->attached = true;
3733 port->send_discover = true;
3738 static void tcpm_snk_detach(struct tcpm_port *port)
3743 static int tcpm_acc_attach(struct tcpm_port *port)
3750 ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3751 tcpm_data_role_for_source(port));
3755 port->partner = NULL;
3757 tcpm_typec_connect(port);
3759 port->attached = true;
3764 static void tcpm_acc_detach(struct tcpm_port *port)
3769 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3771 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3772 return HARD_RESET_SEND;
3773 if (port->pd_capable)
3774 return ERROR_RECOVERY;
3775 if (port->pwr_role == TYPEC_SOURCE)
3776 return SRC_UNATTACHED;
3777 if (port->state == SNK_WAIT_CAPABILITIES)
3779 return SNK_UNATTACHED;
3782 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3784 if (port->port_type == TYPEC_PORT_DRP) {
3785 if (port->pwr_role == TYPEC_SOURCE)
3786 return SRC_UNATTACHED;
3788 return SNK_UNATTACHED;
3789 } else if (port->port_type == TYPEC_PORT_SRC) {
3790 return SRC_UNATTACHED;
3793 return SNK_UNATTACHED;
3796 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3798 if (port->swap_pending) {
3799 port->swap_status = result;
3800 port->swap_pending = false;
3801 port->non_pd_role_swap = false;
3802 complete(&port->swap_complete);
3806 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3809 case TYPEC_CC_RP_1_5:
3810 return TYPEC_PWR_MODE_1_5A;
3811 case TYPEC_CC_RP_3_0:
3812 return TYPEC_PWR_MODE_3_0A;
3813 case TYPEC_CC_RP_DEF:
3815 return TYPEC_PWR_MODE_USB;
3819 static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode)
3822 case TYPEC_PWR_MODE_USB:
3823 return TYPEC_CC_RP_DEF;
3824 case TYPEC_PWR_MODE_1_5A:
3825 return TYPEC_CC_RP_1_5;
3826 case TYPEC_PWR_MODE_3_0A:
3827 case TYPEC_PWR_MODE_PD:
3829 return TYPEC_CC_RP_3_0;
3833 static void run_state_machine(struct tcpm_port *port)
3836 enum typec_pwr_opmode opmode;
3838 enum tcpm_state upcoming_state;
3840 port->enter_state = port->state;
3841 switch (port->state) {
3845 case SRC_UNATTACHED:
3846 if (!port->non_pd_role_swap)
3847 tcpm_swap_complete(port, -ENOTCONN);
3848 tcpm_src_detach(port);
3849 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3850 tcpm_set_state(port, TOGGLING, 0);
3853 tcpm_set_cc(port, tcpm_rp_cc(port));
3854 if (port->port_type == TYPEC_PORT_DRP)
3855 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3857 case SRC_ATTACH_WAIT:
3858 if (tcpm_port_is_debug(port))
3859 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3861 else if (tcpm_port_is_audio(port))
3862 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3864 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3865 tcpm_set_state(port,
3866 tcpm_try_snk(port) ? SNK_TRY
3872 port->try_snk_count++;
3875 * - Do not drive vconn or vbus
3876 * - Terminate CC pins (both) to Rd
3878 * - Wait for tDRPTry (PD_T_DRP_TRY).
3879 * Until then, ignore any state changes.
3881 tcpm_set_cc(port, TYPEC_CC_RD);
3882 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3885 if (tcpm_port_is_sink(port)) {
3886 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3888 tcpm_set_state(port, SRC_TRYWAIT, 0);
3892 case SNK_TRY_WAIT_DEBOUNCE:
3893 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3894 PD_T_TRY_CC_DEBOUNCE);
3896 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3897 if (port->vbus_present && tcpm_port_is_sink(port))
3898 tcpm_set_state(port, SNK_ATTACHED, 0);
3903 tcpm_set_cc(port, tcpm_rp_cc(port));
3904 if (port->max_wait == 0) {
3905 port->max_wait = jiffies +
3906 msecs_to_jiffies(PD_T_DRP_TRY);
3907 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3910 if (time_is_after_jiffies(port->max_wait))
3911 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3912 jiffies_to_msecs(port->max_wait -
3915 tcpm_set_state(port, SNK_UNATTACHED, 0);
3918 case SRC_TRYWAIT_DEBOUNCE:
3919 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3921 case SRC_TRYWAIT_UNATTACHED:
3922 tcpm_set_state(port, SNK_UNATTACHED, 0);
3926 ret = tcpm_src_attach(port);
3927 tcpm_set_state(port, SRC_UNATTACHED,
3928 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
3931 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
3932 typec_set_pwr_opmode(port->typec_port, opmode);
3933 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3934 port->caps_count = 0;
3935 port->negotiated_rev = PD_MAX_REV;
3936 port->message_id = 0;
3937 port->rx_msgid = -1;
3938 port->explicit_contract = false;
3939 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
3940 if (port->ams == POWER_ROLE_SWAP ||
3941 port->ams == FAST_ROLE_SWAP)
3942 tcpm_ams_finish(port);
3943 if (!port->pd_supported) {
3944 tcpm_set_state(port, SRC_READY, 0);
3947 port->upcoming_state = SRC_SEND_CAPABILITIES;
3948 tcpm_ams_start(port, POWER_NEGOTIATION);
3950 case SRC_SEND_CAPABILITIES:
3952 if (port->caps_count > PD_N_CAPS_COUNT) {
3953 tcpm_set_state(port, SRC_READY, 0);
3956 ret = tcpm_pd_send_source_caps(port);
3958 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
3959 PD_T_SEND_SOURCE_CAP);
3962 * Per standard, we should clear the reset counter here.
3963 * However, that can result in state machine hang-ups.
3964 * Reset it only in READY state to improve stability.
3966 /* port->hard_reset_count = 0; */
3967 port->caps_count = 0;
3968 port->pd_capable = true;
3969 tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
3970 PD_T_SEND_SOURCE_CAP);
3973 case SRC_SEND_CAPABILITIES_TIMEOUT:
3975 * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
3977 * PD 2.0 sinks are supposed to accept src-capabilities with a
3978 * 3.0 header and simply ignore any src PDOs which the sink does
3979 * not understand such as PPS but some 2.0 sinks instead ignore
3980 * the entire PD_DATA_SOURCE_CAP message, causing contract
3981 * negotiation to fail.
3983 * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3984 * sending src-capabilities with a lower PD revision to
3985 * make these broken sinks work.
3987 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3988 tcpm_set_state(port, HARD_RESET_SEND, 0);
3989 } else if (port->negotiated_rev > PD_REV20) {
3990 port->negotiated_rev--;
3991 port->hard_reset_count = 0;
3992 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3994 tcpm_set_state(port, hard_reset_state(port), 0);
3997 case SRC_NEGOTIATE_CAPABILITIES:
3998 ret = tcpm_pd_check_request(port);
4000 tcpm_pd_send_control(port, PD_CTRL_REJECT);
4001 if (!port->explicit_contract) {
4002 tcpm_set_state(port,
4003 SRC_WAIT_NEW_CAPABILITIES, 0);
4005 tcpm_set_state(port, SRC_READY, 0);
4008 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4009 tcpm_set_partner_usb_comm_capable(port,
4010 !!(port->sink_request & RDO_USB_COMM));
4011 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
4012 PD_T_SRC_TRANSITION);
4015 case SRC_TRANSITION_SUPPLY:
4016 /* XXX: regulator_set_voltage(vbus, ...) */
4017 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4018 port->explicit_contract = true;
4019 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
4020 port->pwr_opmode = TYPEC_PWR_MODE_PD;
4021 tcpm_set_state_cond(port, SRC_READY, 0);
4025 port->hard_reset_count = 0;
4027 port->try_src_count = 0;
4029 tcpm_swap_complete(port, 0);
4030 tcpm_typec_connect(port);
4032 if (port->ams != NONE_AMS)
4033 tcpm_ams_finish(port);
4034 if (port->next_ams != NONE_AMS) {
4035 port->ams = port->next_ams;
4036 port->next_ams = NONE_AMS;
4040 * If previous AMS is interrupted, switch to the upcoming
4043 if (port->upcoming_state != INVALID_STATE) {
4044 upcoming_state = port->upcoming_state;
4045 port->upcoming_state = INVALID_STATE;
4046 tcpm_set_state(port, upcoming_state, 0);
4051 * 6.4.4.3.1 Discover Identity
4052 * "The Discover Identity Command Shall only be sent to SOP when there is an
4053 * Explicit Contract."
4054 * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4055 * port->explicit_contract to decide whether to send the command.
4057 if (port->explicit_contract)
4058 mod_send_discover_delayed_work(port, 0);
4060 port->send_discover = false;
4064 * Sending ping messages is not necessary if
4065 * - the source operates at vSafe5V
4067 * - The system is not operating in PD mode
4069 * - Both partners are connected using a Type-C connector
4071 * There is no actual need to send PD messages since the local
4072 * port type-c and the spec does not clearly say whether PD is
4073 * possible when type-c is connected to Type-A/B
4076 case SRC_WAIT_NEW_CAPABILITIES:
4077 /* Nothing to do... */
4081 case SNK_UNATTACHED:
4082 if (!port->non_pd_role_swap)
4083 tcpm_swap_complete(port, -ENOTCONN);
4084 tcpm_pps_complete(port, -ENOTCONN);
4085 tcpm_snk_detach(port);
4086 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4087 tcpm_set_state(port, TOGGLING, 0);
4090 tcpm_set_cc(port, TYPEC_CC_RD);
4091 if (port->port_type == TYPEC_PORT_DRP)
4092 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4094 case SNK_ATTACH_WAIT:
4095 if ((port->cc1 == TYPEC_CC_OPEN &&
4096 port->cc2 != TYPEC_CC_OPEN) ||
4097 (port->cc1 != TYPEC_CC_OPEN &&
4098 port->cc2 == TYPEC_CC_OPEN))
4099 tcpm_set_state(port, SNK_DEBOUNCED,
4101 else if (tcpm_port_is_disconnected(port))
4102 tcpm_set_state(port, SNK_UNATTACHED,
4106 if (tcpm_port_is_disconnected(port))
4107 tcpm_set_state(port, SNK_UNATTACHED,
4109 else if (port->vbus_present)
4110 tcpm_set_state(port,
4111 tcpm_try_src(port) ? SRC_TRY
4116 port->try_src_count++;
4117 tcpm_set_cc(port, tcpm_rp_cc(port));
4119 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4122 if (port->max_wait == 0) {
4123 port->max_wait = jiffies +
4124 msecs_to_jiffies(PD_T_DRP_TRY);
4125 msecs = PD_T_DRP_TRY;
4127 if (time_is_after_jiffies(port->max_wait))
4128 msecs = jiffies_to_msecs(port->max_wait -
4133 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4135 case SRC_TRY_DEBOUNCE:
4136 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4139 tcpm_set_cc(port, TYPEC_CC_RD);
4140 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4142 case SNK_TRYWAIT_VBUS:
4144 * TCPM stays in this state indefinitely until VBUS
4145 * is detected as long as Rp is not detected for
4146 * more than a time period of tPDDebounce.
4148 if (port->vbus_present && tcpm_port_is_sink(port)) {
4149 tcpm_set_state(port, SNK_ATTACHED, 0);
4152 if (!tcpm_port_is_sink(port))
4153 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4155 case SNK_TRYWAIT_DEBOUNCE:
4156 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4159 ret = tcpm_snk_attach(port);
4161 tcpm_set_state(port, SNK_UNATTACHED, 0);
4163 tcpm_set_state(port, SNK_STARTUP, 0);
4166 opmode = tcpm_get_pwr_opmode(port->polarity ?
4167 port->cc2 : port->cc1);
4168 typec_set_pwr_opmode(port->typec_port, opmode);
4169 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4170 port->negotiated_rev = PD_MAX_REV;
4171 port->message_id = 0;
4172 port->rx_msgid = -1;
4173 port->explicit_contract = false;
4175 if (port->ams == POWER_ROLE_SWAP ||
4176 port->ams == FAST_ROLE_SWAP)
4177 /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4178 tcpm_ams_finish(port);
4180 tcpm_set_state(port, SNK_DISCOVERY, 0);
4183 if (port->vbus_present) {
4184 u32 current_lim = tcpm_get_current_limit(port);
4186 if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4187 current_lim = PD_P_SNK_STDBY_MW / 5;
4188 tcpm_set_current_limit(port, current_lim, 5000);
4189 tcpm_set_charge(port, true);
4190 if (!port->pd_supported)
4191 tcpm_set_state(port, SNK_READY, 0);
4193 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4197 * For DRP, timeouts differ. Also, handling is supposed to be
4198 * different and much more complex (dead battery detection;
4199 * see USB power delivery specification, section 8.3.3.6.1.5.1).
4201 tcpm_set_state(port, hard_reset_state(port),
4202 port->port_type == TYPEC_PORT_DRP ?
4203 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4205 case SNK_DISCOVERY_DEBOUNCE:
4206 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4209 case SNK_DISCOVERY_DEBOUNCE_DONE:
4210 if (!tcpm_port_is_disconnected(port) &&
4211 tcpm_port_is_sink(port) &&
4212 ktime_after(port->delayed_runtime, ktime_get())) {
4213 tcpm_set_state(port, SNK_DISCOVERY,
4214 ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4217 tcpm_set_state(port, unattached_state(port), 0);
4219 case SNK_WAIT_CAPABILITIES:
4220 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4222 tcpm_set_state(port, SNK_READY, 0);
4226 * If VBUS has never been low, and we time out waiting
4227 * for source cap, try a soft reset first, in case we
4228 * were already in a stable contract before this boot.
4229 * Do this only once.
4231 if (port->vbus_never_low) {
4232 port->vbus_never_low = false;
4233 tcpm_set_state(port, SNK_SOFT_RESET,
4234 PD_T_SINK_WAIT_CAP);
4236 tcpm_set_state(port, hard_reset_state(port),
4237 PD_T_SINK_WAIT_CAP);
4240 case SNK_NEGOTIATE_CAPABILITIES:
4241 port->pd_capable = true;
4242 tcpm_set_partner_usb_comm_capable(port,
4243 !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4244 port->hard_reset_count = 0;
4245 ret = tcpm_pd_send_request(port);
4247 /* Restore back to the original state */
4248 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4249 port->pps_data.active,
4250 port->supply_voltage);
4251 /* Let the Source send capabilities again. */
4252 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4254 tcpm_set_state_cond(port, hard_reset_state(port),
4255 PD_T_SENDER_RESPONSE);
4258 case SNK_NEGOTIATE_PPS_CAPABILITIES:
4259 ret = tcpm_pd_send_pps_request(port);
4261 /* Restore back to the original state */
4262 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_PD,
4263 port->pps_data.active,
4264 port->supply_voltage);
4265 port->pps_status = ret;
4267 * If this was called due to updates to sink
4268 * capabilities, and pps is no longer valid, we should
4269 * safely fall back to a standard PDO.
4271 if (port->update_sink_caps)
4272 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4274 tcpm_set_state(port, SNK_READY, 0);
4276 tcpm_set_state_cond(port, hard_reset_state(port),
4277 PD_T_SENDER_RESPONSE);
4280 case SNK_TRANSITION_SINK:
4281 /* From the USB PD spec:
4282 * "The Sink Shall transition to Sink Standby before a positive or
4283 * negative voltage transition of VBUS. During Sink Standby
4284 * the Sink Shall reduce its power draw to pSnkStdby."
4286 * This is not applicable to PPS though as the port can continue
4287 * to draw negotiated power without switching to standby.
4289 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4290 port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4291 u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4293 tcpm_log(port, "Setting standby current %u mV @ %u mA",
4294 port->supply_voltage, stdby_ma);
4295 tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4298 case SNK_TRANSITION_SINK_VBUS:
4299 tcpm_set_state(port, hard_reset_state(port),
4300 PD_T_PS_TRANSITION);
4303 port->try_snk_count = 0;
4304 port->update_sink_caps = false;
4305 if (port->explicit_contract) {
4306 typec_set_pwr_opmode(port->typec_port,
4308 port->pwr_opmode = TYPEC_PWR_MODE_PD;
4311 if (!port->pd_capable && port->slow_charger_loop)
4312 tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4313 tcpm_swap_complete(port, 0);
4314 tcpm_typec_connect(port);
4315 mod_enable_frs_delayed_work(port, 0);
4316 tcpm_pps_complete(port, port->pps_status);
4318 if (port->ams != NONE_AMS)
4319 tcpm_ams_finish(port);
4320 if (port->next_ams != NONE_AMS) {
4321 port->ams = port->next_ams;
4322 port->next_ams = NONE_AMS;
4326 * If previous AMS is interrupted, switch to the upcoming
4329 if (port->upcoming_state != INVALID_STATE) {
4330 upcoming_state = port->upcoming_state;
4331 port->upcoming_state = INVALID_STATE;
4332 tcpm_set_state(port, upcoming_state, 0);
4337 * 6.4.4.3.1 Discover Identity
4338 * "The Discover Identity Command Shall only be sent to SOP when there is an
4339 * Explicit Contract."
4340 * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4341 * port->explicit_contract.
4343 if (port->explicit_contract)
4344 mod_send_discover_delayed_work(port, 0);
4346 port->send_discover = false;
4348 power_supply_changed(port->psy);
4351 /* Accessory states */
4352 case ACC_UNATTACHED:
4353 tcpm_acc_detach(port);
4354 tcpm_set_state(port, SRC_UNATTACHED, 0);
4356 case DEBUG_ACC_ATTACHED:
4357 case AUDIO_ACC_ATTACHED:
4358 ret = tcpm_acc_attach(port);
4360 tcpm_set_state(port, ACC_UNATTACHED, 0);
4362 case AUDIO_ACC_DEBOUNCE:
4363 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4366 /* Hard_Reset states */
4367 case HARD_RESET_SEND:
4368 if (port->ams != NONE_AMS)
4369 tcpm_ams_finish(port);
4371 * State machine will be directed to HARD_RESET_START,
4372 * thus set upcoming_state to INVALID_STATE.
4374 port->upcoming_state = INVALID_STATE;
4375 tcpm_ams_start(port, HARD_RESET);
4377 case HARD_RESET_START:
4378 port->sink_cap_done = false;
4379 if (port->tcpc->enable_frs)
4380 port->tcpc->enable_frs(port->tcpc, false);
4381 port->hard_reset_count++;
4382 port->tcpc->set_pd_rx(port->tcpc, false);
4383 tcpm_unregister_altmodes(port);
4384 port->nr_sink_caps = 0;
4385 port->send_discover = true;
4386 if (port->pwr_role == TYPEC_SOURCE)
4387 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4388 PD_T_PS_HARD_RESET);
4390 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4392 case SRC_HARD_RESET_VBUS_OFF:
4394 * 7.1.5 Response to Hard Resets
4395 * Hard Reset Signaling indicates a communication failure has occurred and the
4396 * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4397 * drive VBUS to vSafe0V as shown in Figure 7-9.
4399 tcpm_set_vconn(port, false);
4400 tcpm_set_vbus(port, false);
4401 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4402 tcpm_data_role_for_source(port));
4404 * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4405 * PD_T_SRC_RECOVER before turning vbus back on.
4406 * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4407 * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4408 * tells the Device Policy Manager to instruct the power supply to perform a
4409 * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4410 * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4411 * re-establish communication with the Sink and resume USB Default Operation.
4412 * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4414 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4416 case SRC_HARD_RESET_VBUS_ON:
4417 tcpm_set_vconn(port, true);
4418 tcpm_set_vbus(port, true);
4419 if (port->ams == HARD_RESET)
4420 tcpm_ams_finish(port);
4421 if (port->pd_supported)
4422 port->tcpc->set_pd_rx(port->tcpc, true);
4423 tcpm_set_attached_state(port, true);
4424 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4426 case SNK_HARD_RESET_SINK_OFF:
4427 /* Do not discharge/disconnect during hard reseet */
4428 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4429 memset(&port->pps_data, 0, sizeof(port->pps_data));
4430 tcpm_set_vconn(port, false);
4431 if (port->pd_capable)
4432 tcpm_set_charge(port, false);
4433 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4434 tcpm_data_role_for_sink(port));
4436 * VBUS may or may not toggle, depending on the adapter.
4437 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4438 * directly after timeout.
4440 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4442 case SNK_HARD_RESET_WAIT_VBUS:
4443 if (port->ams == HARD_RESET)
4444 tcpm_ams_finish(port);
4445 /* Assume we're disconnected if VBUS doesn't come back. */
4446 tcpm_set_state(port, SNK_UNATTACHED,
4447 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4449 case SNK_HARD_RESET_SINK_ON:
4450 /* Note: There is no guarantee that VBUS is on in this state */
4453 * The specification suggests that dual mode ports in sink
4454 * mode should transition to state PE_SRC_Transition_to_default.
4455 * See USB power delivery specification chapter 8.3.3.6.1.3.
4456 * This would mean to to
4457 * - turn off VCONN, reset power supply
4458 * - request hardware reset
4460 * - Transition to state PE_Src_Startup
4461 * SNK only ports shall transition to state Snk_Startup
4462 * (see chapter 8.3.3.3.8).
4463 * Similar, dual-mode ports in source mode should transition
4464 * to PE_SNK_Transition_to_default.
4466 if (port->pd_capable) {
4467 tcpm_set_current_limit(port,
4468 tcpm_get_current_limit(port),
4470 tcpm_set_charge(port, true);
4472 if (port->ams == HARD_RESET)
4473 tcpm_ams_finish(port);
4474 tcpm_set_attached_state(port, true);
4475 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4476 tcpm_set_state(port, SNK_STARTUP, 0);
4479 /* Soft_Reset states */
4481 port->message_id = 0;
4482 port->rx_msgid = -1;
4483 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4484 tcpm_ams_finish(port);
4485 if (port->pwr_role == TYPEC_SOURCE) {
4486 port->upcoming_state = SRC_SEND_CAPABILITIES;
4487 tcpm_ams_start(port, POWER_NEGOTIATION);
4489 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4492 case SRC_SOFT_RESET_WAIT_SNK_TX:
4493 case SNK_SOFT_RESET:
4494 if (port->ams != NONE_AMS)
4495 tcpm_ams_finish(port);
4496 port->upcoming_state = SOFT_RESET_SEND;
4497 tcpm_ams_start(port, SOFT_RESET_AMS);
4499 case SOFT_RESET_SEND:
4500 port->message_id = 0;
4501 port->rx_msgid = -1;
4502 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4503 tcpm_set_state_cond(port, hard_reset_state(port), 0);
4505 tcpm_set_state_cond(port, hard_reset_state(port),
4506 PD_T_SENDER_RESPONSE);
4509 /* DR_Swap states */
4511 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4512 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4513 port->send_discover = true;
4514 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4515 PD_T_SENDER_RESPONSE);
4517 case DR_SWAP_ACCEPT:
4518 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4519 if (port->data_role == TYPEC_DEVICE || port->negotiated_rev > PD_REV20)
4520 port->send_discover = true;
4521 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4523 case DR_SWAP_SEND_TIMEOUT:
4524 tcpm_swap_complete(port, -ETIMEDOUT);
4525 port->send_discover = false;
4526 tcpm_ams_finish(port);
4527 tcpm_set_state(port, ready_state(port), 0);
4529 case DR_SWAP_CHANGE_DR:
4530 if (port->data_role == TYPEC_HOST) {
4531 tcpm_unregister_altmodes(port);
4532 tcpm_set_roles(port, true, port->pwr_role,
4535 tcpm_set_roles(port, true, port->pwr_role,
4538 tcpm_ams_finish(port);
4539 tcpm_set_state(port, ready_state(port), 0);
4543 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4544 tcpm_set_state(port, ERROR_RECOVERY, 0);
4547 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4549 case FR_SWAP_SEND_TIMEOUT:
4550 tcpm_set_state(port, ERROR_RECOVERY, 0);
4552 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4553 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4555 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4556 if (port->vbus_source)
4557 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4559 tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4561 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4562 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4563 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4564 tcpm_set_state(port, ERROR_RECOVERY, 0);
4567 tcpm_set_cc(port, tcpm_rp_cc(port));
4568 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4571 /* PR_Swap states */
4572 case PR_SWAP_ACCEPT:
4573 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4574 tcpm_set_state(port, PR_SWAP_START, 0);
4577 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4578 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4579 PD_T_SENDER_RESPONSE);
4581 case PR_SWAP_SEND_TIMEOUT:
4582 tcpm_swap_complete(port, -ETIMEDOUT);
4583 tcpm_set_state(port, ready_state(port), 0);
4586 tcpm_apply_rc(port);
4587 if (port->pwr_role == TYPEC_SOURCE)
4588 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4589 PD_T_SRC_TRANSITION);
4591 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4593 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4595 * Prevent vbus discharge circuit from turning on during PR_SWAP
4596 * as this is not a disconnect.
4598 tcpm_set_vbus(port, false);
4599 port->explicit_contract = false;
4600 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4601 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4604 case PR_SWAP_SRC_SNK_SOURCE_OFF:
4605 tcpm_set_cc(port, TYPEC_CC_RD);
4606 /* allow CC debounce */
4607 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4610 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4612 * USB-PD standard, 6.2.1.4, Port Power Role:
4613 * "During the Power Role Swap Sequence, for the initial Source
4614 * Port, the Port Power Role field shall be set to Sink in the
4615 * PS_RDY Message indicating that the initial Source’s power
4616 * supply is turned off"
4618 tcpm_set_pwr_role(port, TYPEC_SINK);
4619 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4620 tcpm_set_state(port, ERROR_RECOVERY, 0);
4623 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4625 case PR_SWAP_SRC_SNK_SINK_ON:
4626 tcpm_enable_auto_vbus_discharge(port, true);
4627 /* Set the vbus disconnect threshold for implicit contract */
4628 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4629 tcpm_set_state(port, SNK_STARTUP, 0);
4631 case PR_SWAP_SNK_SRC_SINK_OFF:
4633 * Prevent vbus discharge circuit from turning on during PR_SWAP
4634 * as this is not a disconnect.
4636 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4637 port->pps_data.active, 0);
4638 tcpm_set_charge(port, false);
4639 tcpm_set_state(port, hard_reset_state(port),
4640 PD_T_PS_SOURCE_OFF);
4642 case PR_SWAP_SNK_SRC_SOURCE_ON:
4643 tcpm_enable_auto_vbus_discharge(port, true);
4644 tcpm_set_cc(port, tcpm_rp_cc(port));
4645 tcpm_set_vbus(port, true);
4647 * allow time VBUS ramp-up, must be < tNewSrc
4648 * Also, this window overlaps with CC debounce as well.
4649 * So, Wait for the max of two which is PD_T_NEWSRC
4651 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4654 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4656 * USB PD standard, 6.2.1.4:
4657 * "Subsequent Messages initiated by the Policy Engine,
4658 * such as the PS_RDY Message sent to indicate that Vbus
4659 * is ready, will have the Port Power Role field set to
4662 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4663 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4664 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4667 case VCONN_SWAP_ACCEPT:
4668 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4669 tcpm_ams_finish(port);
4670 tcpm_set_state(port, VCONN_SWAP_START, 0);
4672 case VCONN_SWAP_SEND:
4673 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4674 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4675 PD_T_SENDER_RESPONSE);
4677 case VCONN_SWAP_SEND_TIMEOUT:
4678 tcpm_swap_complete(port, -ETIMEDOUT);
4679 tcpm_set_state(port, ready_state(port), 0);
4681 case VCONN_SWAP_START:
4682 if (port->vconn_role == TYPEC_SOURCE)
4683 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4685 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4687 case VCONN_SWAP_WAIT_FOR_VCONN:
4688 tcpm_set_state(port, hard_reset_state(port),
4689 PD_T_VCONN_SOURCE_ON);
4691 case VCONN_SWAP_TURN_ON_VCONN:
4692 tcpm_set_vconn(port, true);
4693 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4694 tcpm_set_state(port, ready_state(port), 0);
4696 case VCONN_SWAP_TURN_OFF_VCONN:
4697 tcpm_set_vconn(port, false);
4698 tcpm_set_state(port, ready_state(port), 0);
4701 case DR_SWAP_CANCEL:
4702 case PR_SWAP_CANCEL:
4703 case VCONN_SWAP_CANCEL:
4704 tcpm_swap_complete(port, port->swap_status);
4705 if (port->pwr_role == TYPEC_SOURCE)
4706 tcpm_set_state(port, SRC_READY, 0);
4708 tcpm_set_state(port, SNK_READY, 0);
4710 case FR_SWAP_CANCEL:
4711 if (port->pwr_role == TYPEC_SOURCE)
4712 tcpm_set_state(port, SRC_READY, 0);
4714 tcpm_set_state(port, SNK_READY, 0);
4718 switch (BDO_MODE_MASK(port->bist_request)) {
4719 case BDO_MODE_CARRIER2:
4720 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4721 tcpm_set_state(port, unattached_state(port),
4722 PD_T_BIST_CONT_MODE);
4724 case BDO_MODE_TESTDATA:
4725 if (port->tcpc->set_bist_data) {
4726 tcpm_log(port, "Enable BIST MODE TESTDATA");
4727 port->tcpc->set_bist_data(port->tcpc, true);
4734 case GET_STATUS_SEND:
4735 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4736 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4737 PD_T_SENDER_RESPONSE);
4739 case GET_STATUS_SEND_TIMEOUT:
4740 tcpm_set_state(port, ready_state(port), 0);
4742 case GET_PPS_STATUS_SEND:
4743 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4744 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4745 PD_T_SENDER_RESPONSE);
4747 case GET_PPS_STATUS_SEND_TIMEOUT:
4748 tcpm_set_state(port, ready_state(port), 0);
4751 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4752 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4754 case GET_SINK_CAP_TIMEOUT:
4755 port->sink_cap_done = true;
4756 tcpm_set_state(port, ready_state(port), 0);
4758 case ERROR_RECOVERY:
4759 tcpm_swap_complete(port, -EPROTO);
4760 tcpm_pps_complete(port, -EPROTO);
4761 tcpm_set_state(port, PORT_RESET, 0);
4764 tcpm_reset_port(port);
4765 tcpm_set_cc(port, TYPEC_CC_OPEN);
4766 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4767 PD_T_ERROR_RECOVERY);
4769 case PORT_RESET_WAIT_OFF:
4770 tcpm_set_state(port,
4771 tcpm_default_state(port),
4772 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4775 /* AMS intermediate state */
4777 if (port->upcoming_state == INVALID_STATE) {
4778 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4779 SRC_READY : SNK_READY, 0);
4783 upcoming_state = port->upcoming_state;
4784 port->upcoming_state = INVALID_STATE;
4785 tcpm_set_state(port, upcoming_state, 0);
4789 case CHUNK_NOT_SUPP:
4790 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4791 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4794 WARN(1, "Unexpected port state %d\n", port->state);
4799 static void tcpm_state_machine_work(struct kthread_work *work)
4801 struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4802 enum tcpm_state prev_state;
4804 mutex_lock(&port->lock);
4805 port->state_machine_running = true;
4807 if (port->queued_message && tcpm_send_queued_message(port))
4810 /* If we were queued due to a delayed state change, update it now */
4811 if (port->delayed_state) {
4812 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4813 tcpm_states[port->state],
4814 tcpm_states[port->delayed_state], port->delay_ms);
4815 port->prev_state = port->state;
4816 port->state = port->delayed_state;
4817 port->delayed_state = INVALID_STATE;
4821 * Continue running as long as we have (non-delayed) state changes
4825 prev_state = port->state;
4826 run_state_machine(port);
4827 if (port->queued_message)
4828 tcpm_send_queued_message(port);
4829 } while (port->state != prev_state && !port->delayed_state);
4832 port->state_machine_running = false;
4833 mutex_unlock(&port->lock);
4836 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4837 enum typec_cc_status cc2)
4839 enum typec_cc_status old_cc1, old_cc2;
4840 enum tcpm_state new_state;
4842 old_cc1 = port->cc1;
4843 old_cc2 = port->cc2;
4847 tcpm_log_force(port,
4848 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4849 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4851 tcpm_port_is_disconnected(port) ? "disconnected"
4854 switch (port->state) {
4856 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4857 tcpm_port_is_source(port))
4858 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4859 else if (tcpm_port_is_sink(port))
4860 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4862 case SRC_UNATTACHED:
4863 case ACC_UNATTACHED:
4864 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4865 tcpm_port_is_source(port))
4866 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4868 case SRC_ATTACH_WAIT:
4869 if (tcpm_port_is_disconnected(port) ||
4870 tcpm_port_is_audio_detached(port))
4871 tcpm_set_state(port, SRC_UNATTACHED, 0);
4872 else if (cc1 != old_cc1 || cc2 != old_cc2)
4873 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4877 case SRC_SEND_CAPABILITIES:
4879 if (tcpm_port_is_disconnected(port) ||
4880 !tcpm_port_is_source(port)) {
4881 if (port->port_type == TYPEC_PORT_SRC)
4882 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4884 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4887 case SNK_UNATTACHED:
4888 if (tcpm_port_is_sink(port))
4889 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4891 case SNK_ATTACH_WAIT:
4892 if ((port->cc1 == TYPEC_CC_OPEN &&
4893 port->cc2 != TYPEC_CC_OPEN) ||
4894 (port->cc1 != TYPEC_CC_OPEN &&
4895 port->cc2 == TYPEC_CC_OPEN))
4896 new_state = SNK_DEBOUNCED;
4897 else if (tcpm_port_is_disconnected(port))
4898 new_state = SNK_UNATTACHED;
4901 if (new_state != port->delayed_state)
4902 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4905 if (tcpm_port_is_disconnected(port))
4906 new_state = SNK_UNATTACHED;
4907 else if (port->vbus_present)
4908 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
4910 new_state = SNK_UNATTACHED;
4911 if (new_state != port->delayed_state)
4912 tcpm_set_state(port, SNK_DEBOUNCED, 0);
4916 * EXIT condition is based primarily on vbus disconnect and CC is secondary.
4917 * "A port that has entered into USB PD communications with the Source and
4918 * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
4919 * cable disconnect in addition to monitoring VBUS.
4921 * A port that is monitoring the CC voltage for disconnect (but is not in
4922 * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
4923 * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
4924 * vRd-USB for tPDDebounce."
4926 * When set_auto_vbus_discharge_threshold is enabled, CC pins go
4927 * away before vbus decays to disconnect threshold. Allow
4928 * disconnect to be driven by vbus disconnect when auto vbus
4929 * discharge is enabled.
4931 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
4932 tcpm_set_state(port, unattached_state(port), 0);
4933 else if (!port->pd_capable &&
4934 (cc1 != old_cc1 || cc2 != old_cc2))
4935 tcpm_set_current_limit(port,
4936 tcpm_get_current_limit(port),
4940 case AUDIO_ACC_ATTACHED:
4941 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4942 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
4944 case AUDIO_ACC_DEBOUNCE:
4945 if (tcpm_port_is_audio(port))
4946 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
4949 case DEBUG_ACC_ATTACHED:
4950 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4951 tcpm_set_state(port, ACC_UNATTACHED, 0);
4955 /* Do nothing, waiting for timeout */
4959 /* CC line is unstable, wait for debounce */
4960 if (tcpm_port_is_disconnected(port))
4961 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
4963 case SNK_DISCOVERY_DEBOUNCE:
4967 /* Hand over to state machine if needed */
4968 if (!port->vbus_present && tcpm_port_is_source(port))
4969 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
4971 case SRC_TRYWAIT_DEBOUNCE:
4972 if (port->vbus_present || !tcpm_port_is_source(port))
4973 tcpm_set_state(port, SRC_TRYWAIT, 0);
4975 case SNK_TRY_WAIT_DEBOUNCE:
4976 if (!tcpm_port_is_sink(port)) {
4978 tcpm_set_state(port, SRC_TRYWAIT, 0);
4982 if (tcpm_port_is_source(port))
4983 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
4985 case SRC_TRY_DEBOUNCE:
4986 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4988 case SNK_TRYWAIT_DEBOUNCE:
4989 if (tcpm_port_is_sink(port))
4990 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
4992 case SNK_TRYWAIT_VBUS:
4993 if (!tcpm_port_is_sink(port))
4994 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4996 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
4997 if (!tcpm_port_is_sink(port))
4998 tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
5000 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
5003 /* Do nothing, waiting for tCCDebounce */
5005 case PR_SWAP_SNK_SRC_SINK_OFF:
5006 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5007 case PR_SWAP_SRC_SNK_SOURCE_OFF:
5008 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
5009 case PR_SWAP_SNK_SRC_SOURCE_ON:
5011 * CC state change is expected in PR_SWAP
5016 case FR_SWAP_SEND_TIMEOUT:
5017 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5018 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5019 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5020 /* Do nothing, CC change expected */
5024 case PORT_RESET_WAIT_OFF:
5026 * State set back to default mode once the timer completes.
5027 * Ignore CC changes here.
5032 * While acting as sink and auto vbus discharge is enabled, Allow disconnect
5033 * to be driven by vbus disconnect.
5035 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
5036 port->auto_vbus_discharge_enabled))
5037 tcpm_set_state(port, unattached_state(port), 0);
5042 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
5044 tcpm_log_force(port, "VBUS on");
5045 port->vbus_present = true;
5047 * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
5048 * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
5050 port->vbus_vsafe0v = false;
5052 switch (port->state) {
5053 case SNK_TRANSITION_SINK_VBUS:
5054 port->explicit_contract = true;
5055 tcpm_set_state(port, SNK_READY, 0);
5058 tcpm_set_state(port, SNK_DISCOVERY, 0);
5062 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5066 case SNK_HARD_RESET_WAIT_VBUS:
5067 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5070 tcpm_set_state(port, SRC_STARTUP, 0);
5072 case SRC_HARD_RESET_VBUS_ON:
5073 tcpm_set_state(port, SRC_STARTUP, 0);
5077 /* Do nothing, waiting for timeout */
5080 /* Do nothing, Waiting for Rd to be detected */
5082 case SRC_TRYWAIT_DEBOUNCE:
5083 tcpm_set_state(port, SRC_TRYWAIT, 0);
5085 case SNK_TRY_WAIT_DEBOUNCE:
5086 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5089 /* Do nothing, waiting for tCCDebounce */
5091 case SNK_TRYWAIT_VBUS:
5092 if (tcpm_port_is_sink(port))
5093 tcpm_set_state(port, SNK_ATTACHED, 0);
5095 case SNK_TRYWAIT_DEBOUNCE:
5096 /* Do nothing, waiting for Rp */
5098 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5099 if (port->vbus_present && tcpm_port_is_sink(port))
5100 tcpm_set_state(port, SNK_ATTACHED, 0);
5103 case SRC_TRY_DEBOUNCE:
5104 /* Do nothing, waiting for sink detection */
5107 case FR_SWAP_SEND_TIMEOUT:
5108 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5109 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5110 if (port->tcpc->frs_sourcing_vbus)
5111 port->tcpc->frs_sourcing_vbus(port->tcpc);
5113 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5114 if (port->tcpc->frs_sourcing_vbus)
5115 port->tcpc->frs_sourcing_vbus(port->tcpc);
5116 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5120 case PORT_RESET_WAIT_OFF:
5122 * State set back to default mode once the timer completes.
5123 * Ignore vbus changes here.
5132 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5134 tcpm_log_force(port, "VBUS off");
5135 port->vbus_present = false;
5136 port->vbus_never_low = false;
5137 switch (port->state) {
5138 case SNK_HARD_RESET_SINK_OFF:
5139 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5141 case HARD_RESET_SEND:
5144 /* Do nothing, waiting for timeout */
5147 /* Hand over to state machine if needed */
5148 if (tcpm_port_is_source(port))
5149 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5151 case SNK_TRY_WAIT_DEBOUNCE:
5152 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5155 case SNK_TRYWAIT_VBUS:
5156 case SNK_TRYWAIT_DEBOUNCE:
5158 case SNK_ATTACH_WAIT:
5160 /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */
5163 case SNK_NEGOTIATE_CAPABILITIES:
5166 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5167 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5170 case PR_SWAP_SNK_SRC_SINK_OFF:
5171 /* Do nothing, expected */
5174 case PR_SWAP_SNK_SRC_SOURCE_ON:
5176 * Do nothing when vbus off notification is received.
5177 * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5178 * for the vbus source to ramp up.
5182 case PORT_RESET_WAIT_OFF:
5183 tcpm_set_state(port, tcpm_default_state(port), 0);
5187 case SRC_TRY_DEBOUNCE:
5188 /* Do nothing, waiting for sink detection */
5192 case SRC_SEND_CAPABILITIES:
5193 case SRC_SEND_CAPABILITIES_TIMEOUT:
5194 case SRC_NEGOTIATE_CAPABILITIES:
5195 case SRC_TRANSITION_SUPPLY:
5197 case SRC_WAIT_NEW_CAPABILITIES:
5199 * Force to unattached state to re-initiate connection.
5200 * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5201 * sink removed. Although sink removal here is due to source's vbus collapse,
5202 * treat it the same way for consistency.
5204 if (port->port_type == TYPEC_PORT_SRC)
5205 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5207 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5212 * State set back to default mode once the timer completes.
5213 * Ignore vbus changes here.
5218 case FR_SWAP_SEND_TIMEOUT:
5219 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5220 case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5221 case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5222 /* Do nothing, vbus drop expected */
5226 if (port->pwr_role == TYPEC_SINK && port->attached)
5227 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5232 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5234 tcpm_log_force(port, "VBUS VSAFE0V");
5235 port->vbus_vsafe0v = true;
5236 switch (port->state) {
5237 case SRC_HARD_RESET_VBUS_OFF:
5239 * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5240 * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5242 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5244 case SRC_ATTACH_WAIT:
5245 if (tcpm_port_is_source(port))
5246 tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5250 case SRC_SEND_CAPABILITIES:
5251 case SRC_SEND_CAPABILITIES_TIMEOUT:
5252 case SRC_NEGOTIATE_CAPABILITIES:
5253 case SRC_TRANSITION_SUPPLY:
5255 case SRC_WAIT_NEW_CAPABILITIES:
5256 if (port->auto_vbus_discharge_enabled) {
5257 if (port->port_type == TYPEC_PORT_SRC)
5258 tcpm_set_state(port, SRC_UNATTACHED, 0);
5260 tcpm_set_state(port, SNK_UNATTACHED, 0);
5263 case PR_SWAP_SNK_SRC_SINK_OFF:
5264 case PR_SWAP_SNK_SRC_SOURCE_ON:
5265 /* Do nothing, vsafe0v is expected during transition */
5267 case SNK_ATTACH_WAIT:
5269 /*Do nothing, still waiting for VSAFE5V for connect */
5272 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5273 tcpm_set_state(port, SNK_UNATTACHED, 0);
5278 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5280 tcpm_log_force(port, "Received hard reset");
5281 if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5282 port->tcpc->set_bist_data(port->tcpc, false);
5284 if (port->ams != NONE_AMS)
5285 port->ams = NONE_AMS;
5286 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5287 port->ams = HARD_RESET;
5289 * If we keep receiving hard reset requests, executing the hard reset
5290 * must have failed. Revert to error recovery if that happens.
5292 tcpm_set_state(port,
5293 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5294 HARD_RESET_START : ERROR_RECOVERY,
5298 static void tcpm_pd_event_handler(struct kthread_work *work)
5300 struct tcpm_port *port = container_of(work, struct tcpm_port,
5304 mutex_lock(&port->lock);
5306 spin_lock(&port->pd_event_lock);
5307 while (port->pd_events) {
5308 events = port->pd_events;
5309 port->pd_events = 0;
5310 spin_unlock(&port->pd_event_lock);
5311 if (events & TCPM_RESET_EVENT)
5312 _tcpm_pd_hard_reset(port);
5313 if (events & TCPM_VBUS_EVENT) {
5316 vbus = port->tcpc->get_vbus(port->tcpc);
5318 _tcpm_pd_vbus_on(port);
5320 _tcpm_pd_vbus_off(port);
5322 * When TCPC does not support detecting vsafe0v voltage level,
5323 * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5324 * to see if vbus has discharge to VSAFE0V.
5326 if (!port->tcpc->is_vbus_vsafe0v ||
5327 port->tcpc->is_vbus_vsafe0v(port->tcpc))
5328 _tcpm_pd_vbus_vsafe0v(port);
5331 if (events & TCPM_CC_EVENT) {
5332 enum typec_cc_status cc1, cc2;
5334 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5335 _tcpm_cc_change(port, cc1, cc2);
5337 if (events & TCPM_FRS_EVENT) {
5338 if (port->state == SNK_READY) {
5341 port->upcoming_state = FR_SWAP_SEND;
5342 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5344 port->upcoming_state = INVALID_STATE;
5346 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5349 if (events & TCPM_SOURCING_VBUS) {
5350 tcpm_log(port, "sourcing vbus");
5352 * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5353 * true as TCPM wouldn't have called tcpm_set_vbus.
5355 * When vbus is sourced on the command on TCPM i.e. TCPM called
5356 * tcpm_set_vbus to source vbus, vbus_source would already be true.
5358 port->vbus_source = true;
5359 _tcpm_pd_vbus_on(port);
5362 spin_lock(&port->pd_event_lock);
5364 spin_unlock(&port->pd_event_lock);
5365 mutex_unlock(&port->lock);
5368 void tcpm_cc_change(struct tcpm_port *port)
5370 spin_lock(&port->pd_event_lock);
5371 port->pd_events |= TCPM_CC_EVENT;
5372 spin_unlock(&port->pd_event_lock);
5373 kthread_queue_work(port->wq, &port->event_work);
5375 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5377 void tcpm_vbus_change(struct tcpm_port *port)
5379 spin_lock(&port->pd_event_lock);
5380 port->pd_events |= TCPM_VBUS_EVENT;
5381 spin_unlock(&port->pd_event_lock);
5382 kthread_queue_work(port->wq, &port->event_work);
5384 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5386 void tcpm_pd_hard_reset(struct tcpm_port *port)
5388 spin_lock(&port->pd_event_lock);
5389 port->pd_events = TCPM_RESET_EVENT;
5390 spin_unlock(&port->pd_event_lock);
5391 kthread_queue_work(port->wq, &port->event_work);
5393 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5395 void tcpm_sink_frs(struct tcpm_port *port)
5397 spin_lock(&port->pd_event_lock);
5398 port->pd_events |= TCPM_FRS_EVENT;
5399 spin_unlock(&port->pd_event_lock);
5400 kthread_queue_work(port->wq, &port->event_work);
5402 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5404 void tcpm_sourcing_vbus(struct tcpm_port *port)
5406 spin_lock(&port->pd_event_lock);
5407 port->pd_events |= TCPM_SOURCING_VBUS;
5408 spin_unlock(&port->pd_event_lock);
5409 kthread_queue_work(port->wq, &port->event_work);
5411 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5413 static void tcpm_enable_frs_work(struct kthread_work *work)
5415 struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5418 mutex_lock(&port->lock);
5419 /* Not FRS capable */
5420 if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5421 port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5422 !port->tcpc->enable_frs ||
5423 /* Sink caps queried */
5424 port->sink_cap_done || port->negotiated_rev < PD_REV30)
5427 /* Send when the state machine is idle */
5428 if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5431 port->upcoming_state = GET_SINK_CAP;
5432 ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5433 if (ret == -EAGAIN) {
5434 port->upcoming_state = INVALID_STATE;
5436 port->sink_cap_done = true;
5440 mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5442 mutex_unlock(&port->lock);
5445 static void tcpm_send_discover_work(struct kthread_work *work)
5447 struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5449 mutex_lock(&port->lock);
5450 /* No need to send DISCOVER_IDENTITY anymore */
5451 if (!port->send_discover)
5454 if (port->data_role == TYPEC_DEVICE && port->negotiated_rev < PD_REV30) {
5455 port->send_discover = false;
5459 /* Retry if the port is not idle */
5460 if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5461 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5465 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5468 mutex_unlock(&port->lock);
5471 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5473 struct tcpm_port *port = typec_get_drvdata(p);
5476 mutex_lock(&port->swap_lock);
5477 mutex_lock(&port->lock);
5479 if (port->typec_caps.data != TYPEC_PORT_DRD) {
5483 if (port->state != SRC_READY && port->state != SNK_READY) {
5488 if (port->data_role == data) {
5495 * 6.3.9: If an alternate mode is active, a request to swap
5496 * alternate modes shall trigger a port reset.
5497 * Reject data role swap request in this case.
5500 if (!port->pd_capable) {
5502 * If the partner is not PD capable, reset the port to
5503 * trigger a role change. This can only work if a preferred
5504 * role is configured, and if it matches the requested role.
5506 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5507 port->try_role == port->pwr_role) {
5511 port->non_pd_role_swap = true;
5512 tcpm_set_state(port, PORT_RESET, 0);
5514 port->upcoming_state = DR_SWAP_SEND;
5515 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5516 if (ret == -EAGAIN) {
5517 port->upcoming_state = INVALID_STATE;
5522 port->swap_status = 0;
5523 port->swap_pending = true;
5524 reinit_completion(&port->swap_complete);
5525 mutex_unlock(&port->lock);
5527 if (!wait_for_completion_timeout(&port->swap_complete,
5528 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5531 ret = port->swap_status;
5533 port->non_pd_role_swap = false;
5537 mutex_unlock(&port->lock);
5539 mutex_unlock(&port->swap_lock);
5543 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5545 struct tcpm_port *port = typec_get_drvdata(p);
5548 mutex_lock(&port->swap_lock);
5549 mutex_lock(&port->lock);
5551 if (port->port_type != TYPEC_PORT_DRP) {
5555 if (port->state != SRC_READY && port->state != SNK_READY) {
5560 if (role == port->pwr_role) {
5565 port->upcoming_state = PR_SWAP_SEND;
5566 ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5567 if (ret == -EAGAIN) {
5568 port->upcoming_state = INVALID_STATE;
5572 port->swap_status = 0;
5573 port->swap_pending = true;
5574 reinit_completion(&port->swap_complete);
5575 mutex_unlock(&port->lock);
5577 if (!wait_for_completion_timeout(&port->swap_complete,
5578 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5581 ret = port->swap_status;
5586 mutex_unlock(&port->lock);
5588 mutex_unlock(&port->swap_lock);
5592 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5594 struct tcpm_port *port = typec_get_drvdata(p);
5597 mutex_lock(&port->swap_lock);
5598 mutex_lock(&port->lock);
5600 if (port->state != SRC_READY && port->state != SNK_READY) {
5605 if (role == port->vconn_role) {
5610 port->upcoming_state = VCONN_SWAP_SEND;
5611 ret = tcpm_ams_start(port, VCONN_SWAP);
5612 if (ret == -EAGAIN) {
5613 port->upcoming_state = INVALID_STATE;
5617 port->swap_status = 0;
5618 port->swap_pending = true;
5619 reinit_completion(&port->swap_complete);
5620 mutex_unlock(&port->lock);
5622 if (!wait_for_completion_timeout(&port->swap_complete,
5623 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5626 ret = port->swap_status;
5631 mutex_unlock(&port->lock);
5633 mutex_unlock(&port->swap_lock);
5637 static int tcpm_try_role(struct typec_port *p, int role)
5639 struct tcpm_port *port = typec_get_drvdata(p);
5640 struct tcpc_dev *tcpc = port->tcpc;
5643 mutex_lock(&port->lock);
5645 ret = tcpc->try_role(tcpc, role);
5647 port->try_role = role;
5648 port->try_src_count = 0;
5649 port->try_snk_count = 0;
5650 mutex_unlock(&port->lock);
5655 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5657 unsigned int target_mw;
5660 mutex_lock(&port->swap_lock);
5661 mutex_lock(&port->lock);
5663 if (!port->pps_data.active) {
5668 if (port->state != SNK_READY) {
5673 if (req_op_curr > port->pps_data.max_curr) {
5678 target_mw = (req_op_curr * port->supply_voltage) / 1000;
5679 if (target_mw < port->operating_snk_mw) {
5684 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5685 ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5686 if (ret == -EAGAIN) {
5687 port->upcoming_state = INVALID_STATE;
5691 /* Round down operating current to align with PPS valid steps */
5692 req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5694 reinit_completion(&port->pps_complete);
5695 port->pps_data.req_op_curr = req_op_curr;
5696 port->pps_status = 0;
5697 port->pps_pending = true;
5698 mutex_unlock(&port->lock);
5700 if (!wait_for_completion_timeout(&port->pps_complete,
5701 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5704 ret = port->pps_status;
5709 mutex_unlock(&port->lock);
5711 mutex_unlock(&port->swap_lock);
5716 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5718 unsigned int target_mw;
5721 mutex_lock(&port->swap_lock);
5722 mutex_lock(&port->lock);
5724 if (!port->pps_data.active) {
5729 if (port->state != SNK_READY) {
5734 if (req_out_volt < port->pps_data.min_volt ||
5735 req_out_volt > port->pps_data.max_volt) {
5740 target_mw = (port->current_limit * req_out_volt) / 1000;
5741 if (target_mw < port->operating_snk_mw) {
5746 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5747 ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5748 if (ret == -EAGAIN) {
5749 port->upcoming_state = INVALID_STATE;
5753 /* Round down output voltage to align with PPS valid steps */
5754 req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5756 reinit_completion(&port->pps_complete);
5757 port->pps_data.req_out_volt = req_out_volt;
5758 port->pps_status = 0;
5759 port->pps_pending = true;
5760 mutex_unlock(&port->lock);
5762 if (!wait_for_completion_timeout(&port->pps_complete,
5763 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5766 ret = port->pps_status;
5771 mutex_unlock(&port->lock);
5773 mutex_unlock(&port->swap_lock);
5778 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5782 mutex_lock(&port->swap_lock);
5783 mutex_lock(&port->lock);
5785 if (!port->pps_data.supported) {
5790 /* Trying to deactivate PPS when already deactivated so just bail */
5791 if (!port->pps_data.active && !activate)
5794 if (port->state != SNK_READY) {
5800 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5802 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5803 ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5804 if (ret == -EAGAIN) {
5805 port->upcoming_state = INVALID_STATE;
5809 reinit_completion(&port->pps_complete);
5810 port->pps_status = 0;
5811 port->pps_pending = true;
5813 /* Trigger PPS request or move back to standard PDO contract */
5815 port->pps_data.req_out_volt = port->supply_voltage;
5816 port->pps_data.req_op_curr = port->current_limit;
5818 mutex_unlock(&port->lock);
5820 if (!wait_for_completion_timeout(&port->pps_complete,
5821 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5824 ret = port->pps_status;
5829 mutex_unlock(&port->lock);
5831 mutex_unlock(&port->swap_lock);
5836 static void tcpm_init(struct tcpm_port *port)
5838 enum typec_cc_status cc1, cc2;
5840 port->tcpc->init(port->tcpc);
5842 tcpm_reset_port(port);
5846 * Should possibly wait for VBUS to settle if it was enabled locally
5847 * since tcpm_reset_port() will disable VBUS.
5849 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5850 if (port->vbus_present)
5851 port->vbus_never_low = true;
5854 * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5855 * So implicitly vbus_vsafe0v = false.
5857 * 2. When vbus_present is false and TCPC does NOT support querying
5858 * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5859 * vbus_vsafe0v is true.
5861 * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5862 * then, query tcpc for vsafe0v status.
5864 if (port->vbus_present)
5865 port->vbus_vsafe0v = false;
5866 else if (!port->tcpc->is_vbus_vsafe0v)
5867 port->vbus_vsafe0v = true;
5869 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
5871 tcpm_set_state(port, tcpm_default_state(port), 0);
5873 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5874 _tcpm_cc_change(port, cc1, cc2);
5877 * Some adapters need a clean slate at startup, and won't recover
5878 * otherwise. So do not try to be fancy and force a clean disconnect.
5880 tcpm_set_state(port, PORT_RESET, 0);
5883 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
5885 struct tcpm_port *port = typec_get_drvdata(p);
5887 mutex_lock(&port->lock);
5888 if (type == port->port_type)
5891 port->port_type = type;
5893 if (!port->connected) {
5894 tcpm_set_state(port, PORT_RESET, 0);
5895 } else if (type == TYPEC_PORT_SNK) {
5896 if (!(port->pwr_role == TYPEC_SINK &&
5897 port->data_role == TYPEC_DEVICE))
5898 tcpm_set_state(port, PORT_RESET, 0);
5899 } else if (type == TYPEC_PORT_SRC) {
5900 if (!(port->pwr_role == TYPEC_SOURCE &&
5901 port->data_role == TYPEC_HOST))
5902 tcpm_set_state(port, PORT_RESET, 0);
5906 mutex_unlock(&port->lock);
5910 static const struct typec_operations tcpm_ops = {
5911 .try_role = tcpm_try_role,
5912 .dr_set = tcpm_dr_set,
5913 .pr_set = tcpm_pr_set,
5914 .vconn_set = tcpm_vconn_set,
5915 .port_type_set = tcpm_port_type_set
5918 void tcpm_tcpc_reset(struct tcpm_port *port)
5920 mutex_lock(&port->lock);
5921 /* XXX: Maintain PD connection if possible? */
5923 mutex_unlock(&port->lock);
5925 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
5927 static int tcpm_fw_get_caps(struct tcpm_port *port,
5928 struct fwnode_handle *fwnode)
5930 const char *opmode_str;
5932 u32 mw, frs_current;
5938 * This fwnode has a "compatible" property, but is never populated as a
5939 * struct device. Instead we simply parse it to read the properties.
5940 * This it breaks fw_devlink=on. To maintain backward compatibility
5941 * with existing DT files, we work around this by deleting any
5942 * fwnode_links to/from this fwnode.
5944 fw_devlink_purge_absent_suppliers(fwnode);
5946 ret = typec_get_fw_cap(&port->typec_caps, fwnode);
5950 port->port_type = port->typec_caps.type;
5951 port->pd_supported = !fwnode_property_read_bool(fwnode, "pd-disable");
5953 port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
5954 if (port->port_type == TYPEC_PORT_SNK)
5957 /* Get Source PDOs for the PD port or Source Rp value for the non-PD port */
5958 if (port->pd_supported) {
5959 ret = fwnode_property_count_u32(fwnode, "source-pdos");
5965 port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
5966 ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
5967 port->src_pdo, port->nr_src_pdo);
5970 ret = tcpm_validate_caps(port, port->src_pdo, port->nr_src_pdo);
5974 ret = fwnode_property_read_string(fwnode, "typec-power-opmode", &opmode_str);
5977 ret = typec_find_pwr_opmode(opmode_str);
5980 port->src_rp = tcpm_pwr_opmode_to_rp(ret);
5983 if (port->port_type == TYPEC_PORT_SRC)
5987 port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
5989 if (!port->pd_supported)
5993 ret = fwnode_property_count_u32(fwnode, "sink-pdos");
5997 port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
5998 ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
5999 port->snk_pdo, port->nr_snk_pdo);
6000 if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
6004 if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
6006 port->operating_snk_mw = mw / 1000;
6008 /* FRS can only be supported by DRP ports */
6009 if (port->port_type == TYPEC_PORT_DRP) {
6010 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
6012 if (ret >= 0 && frs_current <= FRS_5V_3A)
6013 port->new_source_frs_current = frs_current;
6016 /* sink-vdos is optional */
6017 ret = fwnode_property_count_u32(fwnode, "sink-vdos");
6021 port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
6022 if (port->nr_snk_vdo) {
6023 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
6030 /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
6031 if (port->nr_snk_vdo) {
6032 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
6038 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
6039 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
6041 port->nr_snk_vdo_v1);
6049 /* Power Supply access to expose source power information */
6050 enum tcpm_psy_online_states {
6051 TCPM_PSY_OFFLINE = 0,
6052 TCPM_PSY_FIXED_ONLINE,
6053 TCPM_PSY_PROG_ONLINE,
6056 static enum power_supply_property tcpm_psy_props[] = {
6057 POWER_SUPPLY_PROP_USB_TYPE,
6058 POWER_SUPPLY_PROP_ONLINE,
6059 POWER_SUPPLY_PROP_VOLTAGE_MIN,
6060 POWER_SUPPLY_PROP_VOLTAGE_MAX,
6061 POWER_SUPPLY_PROP_VOLTAGE_NOW,
6062 POWER_SUPPLY_PROP_CURRENT_MAX,
6063 POWER_SUPPLY_PROP_CURRENT_NOW,
6066 static int tcpm_psy_get_online(struct tcpm_port *port,
6067 union power_supply_propval *val)
6069 if (port->vbus_charge) {
6070 if (port->pps_data.active)
6071 val->intval = TCPM_PSY_PROG_ONLINE;
6073 val->intval = TCPM_PSY_FIXED_ONLINE;
6075 val->intval = TCPM_PSY_OFFLINE;
6081 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6082 union power_supply_propval *val)
6084 if (port->pps_data.active)
6085 val->intval = port->pps_data.min_volt * 1000;
6087 val->intval = port->supply_voltage * 1000;
6092 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6093 union power_supply_propval *val)
6095 if (port->pps_data.active)
6096 val->intval = port->pps_data.max_volt * 1000;
6098 val->intval = port->supply_voltage * 1000;
6103 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6104 union power_supply_propval *val)
6106 val->intval = port->supply_voltage * 1000;
6111 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6112 union power_supply_propval *val)
6114 if (port->pps_data.active)
6115 val->intval = port->pps_data.max_curr * 1000;
6117 val->intval = port->current_limit * 1000;
6122 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6123 union power_supply_propval *val)
6125 val->intval = port->current_limit * 1000;
6130 static int tcpm_psy_get_prop(struct power_supply *psy,
6131 enum power_supply_property psp,
6132 union power_supply_propval *val)
6134 struct tcpm_port *port = power_supply_get_drvdata(psy);
6138 case POWER_SUPPLY_PROP_USB_TYPE:
6139 val->intval = port->usb_type;
6141 case POWER_SUPPLY_PROP_ONLINE:
6142 ret = tcpm_psy_get_online(port, val);
6144 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6145 ret = tcpm_psy_get_voltage_min(port, val);
6147 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6148 ret = tcpm_psy_get_voltage_max(port, val);
6150 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6151 ret = tcpm_psy_get_voltage_now(port, val);
6153 case POWER_SUPPLY_PROP_CURRENT_MAX:
6154 ret = tcpm_psy_get_current_max(port, val);
6156 case POWER_SUPPLY_PROP_CURRENT_NOW:
6157 ret = tcpm_psy_get_current_now(port, val);
6167 static int tcpm_psy_set_online(struct tcpm_port *port,
6168 const union power_supply_propval *val)
6172 switch (val->intval) {
6173 case TCPM_PSY_FIXED_ONLINE:
6174 ret = tcpm_pps_activate(port, false);
6176 case TCPM_PSY_PROG_ONLINE:
6177 ret = tcpm_pps_activate(port, true);
6187 static int tcpm_psy_set_prop(struct power_supply *psy,
6188 enum power_supply_property psp,
6189 const union power_supply_propval *val)
6191 struct tcpm_port *port = power_supply_get_drvdata(psy);
6195 case POWER_SUPPLY_PROP_ONLINE:
6196 ret = tcpm_psy_set_online(port, val);
6198 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6199 if (val->intval < port->pps_data.min_volt * 1000 ||
6200 val->intval > port->pps_data.max_volt * 1000)
6203 ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6205 case POWER_SUPPLY_PROP_CURRENT_NOW:
6206 if (val->intval > port->pps_data.max_curr * 1000)
6209 ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6215 power_supply_changed(port->psy);
6219 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6220 enum power_supply_property psp)
6223 case POWER_SUPPLY_PROP_ONLINE:
6224 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6225 case POWER_SUPPLY_PROP_CURRENT_NOW:
6232 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6233 POWER_SUPPLY_USB_TYPE_C,
6234 POWER_SUPPLY_USB_TYPE_PD,
6235 POWER_SUPPLY_USB_TYPE_PD_PPS,
6238 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6240 static int devm_tcpm_psy_register(struct tcpm_port *port)
6242 struct power_supply_config psy_cfg = {};
6243 const char *port_dev_name = dev_name(port->dev);
6244 size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6245 strlen(port_dev_name) + 1;
6248 psy_cfg.drv_data = port;
6249 psy_cfg.fwnode = dev_fwnode(port->dev);
6250 psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6254 snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6256 port->psy_desc.name = psy_name;
6257 port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6258 port->psy_desc.usb_types = tcpm_psy_usb_types;
6259 port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6260 port->psy_desc.properties = tcpm_psy_props;
6261 port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6262 port->psy_desc.get_property = tcpm_psy_get_prop;
6263 port->psy_desc.set_property = tcpm_psy_set_prop;
6264 port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6266 port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6268 port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6271 return PTR_ERR_OR_ZERO(port->psy);
6274 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6276 struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6278 if (port->registered)
6279 kthread_queue_work(port->wq, &port->state_machine);
6280 return HRTIMER_NORESTART;
6283 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6285 struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6287 if (port->registered)
6288 kthread_queue_work(port->wq, &port->vdm_state_machine);
6289 return HRTIMER_NORESTART;
6292 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6294 struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6296 if (port->registered)
6297 kthread_queue_work(port->wq, &port->enable_frs);
6298 return HRTIMER_NORESTART;
6301 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6303 struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6305 if (port->registered)
6306 kthread_queue_work(port->wq, &port->send_discover_work);
6307 return HRTIMER_NORESTART;
6310 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6312 struct tcpm_port *port;
6315 if (!dev || !tcpc ||
6316 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6317 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6318 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6319 return ERR_PTR(-EINVAL);
6321 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6323 return ERR_PTR(-ENOMEM);
6328 mutex_init(&port->lock);
6329 mutex_init(&port->swap_lock);
6331 port->wq = kthread_create_worker(0, dev_name(dev));
6332 if (IS_ERR(port->wq))
6333 return ERR_CAST(port->wq);
6334 sched_set_fifo(port->wq->task);
6336 kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6337 kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6338 kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6339 kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6340 kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6341 hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6342 port->state_machine_timer.function = state_machine_timer_handler;
6343 hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6344 port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6345 hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6346 port->enable_frs_timer.function = enable_frs_timer_handler;
6347 hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6348 port->send_discover_timer.function = send_discover_timer_handler;
6350 spin_lock_init(&port->pd_event_lock);
6352 init_completion(&port->tx_complete);
6353 init_completion(&port->swap_complete);
6354 init_completion(&port->pps_complete);
6355 tcpm_debugfs_init(port);
6357 err = tcpm_fw_get_caps(port, tcpc->fwnode);
6359 goto out_destroy_wq;
6361 port->try_role = port->typec_caps.prefer_role;
6363 port->typec_caps.fwnode = tcpc->fwnode;
6364 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
6365 port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
6366 port->typec_caps.svdm_version = SVDM_VER_2_0;
6367 port->typec_caps.driver_data = port;
6368 port->typec_caps.ops = &tcpm_ops;
6369 port->typec_caps.orientation_aware = 1;
6371 port->partner_desc.identity = &port->partner_ident;
6372 port->port_type = port->typec_caps.type;
6374 port->role_sw = usb_role_switch_get(port->dev);
6375 if (IS_ERR(port->role_sw)) {
6376 err = PTR_ERR(port->role_sw);
6377 goto out_destroy_wq;
6380 err = devm_tcpm_psy_register(port);
6382 goto out_role_sw_put;
6383 power_supply_changed(port->psy);
6385 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6386 if (IS_ERR(port->typec_port)) {
6387 err = PTR_ERR(port->typec_port);
6388 goto out_role_sw_put;
6391 typec_port_register_altmodes(port->typec_port,
6392 &tcpm_altmode_ops, port,
6393 port->port_altmode, ALTMODE_DISCOVERY_MAX);
6394 port->registered = true;
6396 mutex_lock(&port->lock);
6398 mutex_unlock(&port->lock);
6400 tcpm_log(port, "%s: registered", dev_name(dev));
6404 usb_role_switch_put(port->role_sw);
6406 tcpm_debugfs_exit(port);
6407 kthread_destroy_worker(port->wq);
6408 return ERR_PTR(err);
6410 EXPORT_SYMBOL_GPL(tcpm_register_port);
6412 void tcpm_unregister_port(struct tcpm_port *port)
6416 port->registered = false;
6417 kthread_destroy_worker(port->wq);
6419 hrtimer_cancel(&port->send_discover_timer);
6420 hrtimer_cancel(&port->enable_frs_timer);
6421 hrtimer_cancel(&port->vdm_state_machine_timer);
6422 hrtimer_cancel(&port->state_machine_timer);
6424 tcpm_reset_port(port);
6425 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6426 typec_unregister_altmode(port->port_altmode[i]);
6427 typec_unregister_port(port->typec_port);
6428 usb_role_switch_put(port->role_sw);
6429 tcpm_debugfs_exit(port);
6431 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6433 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
6434 MODULE_DESCRIPTION("USB Type-C Port Manager");
6435 MODULE_LICENSE("GPL");