2 * Copyright 2015-2017 Google, Inc
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * USB Power Delivery protocol stack.
17 #include <linux/completion.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/jiffies.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/mutex.h>
24 #include <linux/proc_fs.h>
25 #include <linux/sched/clock.h>
26 #include <linux/seq_file.h>
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <linux/usb/typec.h>
30 #include <linux/workqueue.h>
37 #define FOREACH_STATE(S) \
44 S(SRC_SEND_CAPABILITIES), \
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_TRANSITION_SINK), \
61 S(SNK_TRANSITION_SINK_VBUS), \
65 S(DEBUG_ACC_ATTACHED), \
66 S(AUDIO_ACC_ATTACHED), \
67 S(AUDIO_ACC_DEBOUNCE), \
70 S(HARD_RESET_START), \
71 S(SRC_HARD_RESET_VBUS_OFF), \
72 S(SRC_HARD_RESET_VBUS_ON), \
73 S(SNK_HARD_RESET_SINK_OFF), \
74 S(SNK_HARD_RESET_WAIT_VBUS), \
75 S(SNK_HARD_RESET_SINK_ON), \
82 S(DR_SWAP_SEND_TIMEOUT), \
84 S(DR_SWAP_CHANGE_DR), \
88 S(PR_SWAP_SEND_TIMEOUT), \
91 S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
92 S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
93 S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
94 S(PR_SWAP_SRC_SNK_SINK_ON), \
95 S(PR_SWAP_SNK_SRC_SINK_OFF), \
96 S(PR_SWAP_SNK_SRC_SOURCE_ON), \
97 S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
99 S(VCONN_SWAP_ACCEPT), \
100 S(VCONN_SWAP_SEND), \
101 S(VCONN_SWAP_SEND_TIMEOUT), \
102 S(VCONN_SWAP_CANCEL), \
103 S(VCONN_SWAP_START), \
104 S(VCONN_SWAP_WAIT_FOR_VCONN), \
105 S(VCONN_SWAP_TURN_ON_VCONN), \
106 S(VCONN_SWAP_TURN_OFF_VCONN), \
110 S(SNK_TRY_WAIT_DEBOUNCE), \
111 S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
113 S(SRC_TRYWAIT_DEBOUNCE), \
114 S(SRC_TRYWAIT_UNATTACHED), \
118 S(SRC_TRY_DEBOUNCE), \
120 S(SNK_TRYWAIT_DEBOUNCE), \
121 S(SNK_TRYWAIT_VBUS), \
126 S(PORT_RESET_WAIT_OFF)
128 #define GENERATE_ENUM(e) e
129 #define GENERATE_STRING(s) #s
132 FOREACH_STATE(GENERATE_ENUM)
135 static const char * const tcpm_states[] = {
136 FOREACH_STATE(GENERATE_STRING)
140 VDM_STATE_ERR_BUSY = -3,
141 VDM_STATE_ERR_SEND = -2,
142 VDM_STATE_ERR_TMOUT = -1,
144 /* Anything >0 represents an active state */
147 VDM_STATE_WAIT_RSP_BUSY = 3,
150 enum pd_msg_request {
154 PD_MSG_DATA_SINK_CAP,
155 PD_MSG_DATA_SOURCE_CAP,
158 /* Events from low level driver */
160 #define TCPM_CC_EVENT BIT(0)
161 #define TCPM_VBUS_EVENT BIT(1)
162 #define TCPM_RESET_EVENT BIT(2)
164 #define LOG_BUFFER_ENTRIES 1024
165 #define LOG_BUFFER_ENTRY_SIZE 128
167 /* Alternate mode support */
169 #define SVID_DISCOVERY_MAX 16
171 struct pd_mode_data {
172 int svid_index; /* current SVID index */
174 u16 svids[SVID_DISCOVERY_MAX];
175 int altmodes; /* number of alternate modes */
176 struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
182 struct mutex lock; /* tcpm state machine lock */
183 struct workqueue_struct *wq;
185 struct typec_capability typec_caps;
186 struct typec_port *typec_port;
188 struct tcpc_dev *tcpc;
190 enum typec_role vconn_role;
191 enum typec_role pwr_role;
192 enum typec_data_role data_role;
193 enum typec_pwr_opmode pwr_opmode;
195 struct usb_pd_identity partner_ident;
196 struct typec_partner_desc partner_desc;
197 struct typec_partner *partner;
199 enum typec_cc_status cc_req;
201 enum typec_cc_status cc1;
202 enum typec_cc_status cc2;
203 enum typec_cc_polarity polarity;
207 enum typec_port_type port_type;
220 enum pd_msg_request queued_message;
222 enum tcpm_state enter_state;
223 enum tcpm_state prev_state;
224 enum tcpm_state state;
225 enum tcpm_state delayed_state;
226 unsigned long delayed_runtime;
227 unsigned long delay_ms;
229 spinlock_t pd_event_lock;
232 struct work_struct event_work;
233 struct delayed_work state_machine;
234 struct delayed_work vdm_state_machine;
235 bool state_machine_running;
237 struct completion tx_complete;
238 enum tcpm_transmit_status tx_status;
240 struct mutex swap_lock; /* swap command lock */
242 bool non_pd_role_swap;
243 struct completion swap_complete;
246 unsigned int message_id;
247 unsigned int caps_count;
248 unsigned int hard_reset_count;
250 bool explicit_contract;
251 unsigned int rx_msgid;
253 /* Partner capabilities/requests */
255 u32 source_caps[PDO_MAX_OBJECTS];
256 unsigned int nr_source_caps;
257 u32 sink_caps[PDO_MAX_OBJECTS];
258 unsigned int nr_sink_caps;
260 /* Local capabilities */
261 u32 src_pdo[PDO_MAX_OBJECTS];
262 unsigned int nr_src_pdo;
263 u32 snk_pdo[PDO_MAX_OBJECTS];
264 unsigned int nr_snk_pdo;
265 u32 snk_vdo[VDO_MAX_OBJECTS];
266 unsigned int nr_snk_vdo;
268 unsigned int max_snk_mv;
269 unsigned int max_snk_ma;
270 unsigned int max_snk_mw;
271 unsigned int operating_snk_mw;
273 /* Requested current / voltage */
279 /* PD state for Vendor Defined Messages */
280 enum vdm_states vdm_state;
282 /* next Vendor Defined Message to send */
283 u32 vdo_data[VDO_MAX_SIZE];
285 /* VDO to retry if UFP responder replied busy */
288 /* Alternate mode data */
290 struct pd_mode_data mode_data;
291 struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
292 struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
294 /* Deadline in jiffies to exit src_try_wait state */
295 unsigned long max_wait;
297 #ifdef CONFIG_DEBUG_FS
298 struct dentry *dentry;
299 struct mutex logbuffer_lock; /* log buffer access lock */
302 u8 *logbuffer[LOG_BUFFER_ENTRIES];
307 struct work_struct work;
308 struct tcpm_port *port;
309 struct pd_message msg;
312 #define tcpm_cc_is_sink(cc) \
313 ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
314 (cc) == TYPEC_CC_RP_3_0)
316 #define tcpm_port_is_sink(port) \
317 ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
318 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
320 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
321 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
322 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
324 #define tcpm_port_is_source(port) \
325 ((tcpm_cc_is_source((port)->cc1) && \
326 !tcpm_cc_is_source((port)->cc2)) || \
327 (tcpm_cc_is_source((port)->cc2) && \
328 !tcpm_cc_is_source((port)->cc1)))
330 #define tcpm_port_is_debug(port) \
331 (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
333 #define tcpm_port_is_audio(port) \
334 (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
336 #define tcpm_port_is_audio_detached(port) \
337 ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
338 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
340 #define tcpm_try_snk(port) \
341 ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
342 (port)->port_type == TYPEC_PORT_DRP)
344 #define tcpm_try_src(port) \
345 ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
346 (port)->port_type == TYPEC_PORT_DRP)
348 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
350 if (port->port_type == TYPEC_PORT_DRP) {
351 if (port->try_role == TYPEC_SINK)
352 return SNK_UNATTACHED;
353 else if (port->try_role == TYPEC_SOURCE)
354 return SRC_UNATTACHED;
355 else if (port->tcpc->config->default_role == TYPEC_SINK)
356 return SNK_UNATTACHED;
357 /* Fall through to return SRC_UNATTACHED */
358 } else if (port->port_type == TYPEC_PORT_UFP) {
359 return SNK_UNATTACHED;
361 return SRC_UNATTACHED;
365 struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
367 return container_of(cap, struct tcpm_port, typec_caps);
370 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
372 return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
373 port->cc2 == TYPEC_CC_OPEN) ||
374 (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
375 port->cc1 == TYPEC_CC_OPEN) ||
376 (port->polarity == TYPEC_POLARITY_CC2 &&
377 port->cc2 == TYPEC_CC_OPEN)));
384 #ifdef CONFIG_DEBUG_FS
386 static bool tcpm_log_full(struct tcpm_port *port)
388 return port->logbuffer_tail ==
389 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
393 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
395 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
396 u64 ts_nsec = local_clock();
397 unsigned long rem_nsec;
399 if (!port->logbuffer[port->logbuffer_head]) {
400 port->logbuffer[port->logbuffer_head] =
401 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
402 if (!port->logbuffer[port->logbuffer_head])
406 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
408 mutex_lock(&port->logbuffer_lock);
410 if (tcpm_log_full(port)) {
411 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
412 strcpy(tmpbuffer, "overflow");
415 if (port->logbuffer_head < 0 ||
416 port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
418 "Bad log buffer index %d\n", port->logbuffer_head);
422 if (!port->logbuffer[port->logbuffer_head]) {
424 "Log buffer index %d is NULL\n", port->logbuffer_head);
428 rem_nsec = do_div(ts_nsec, 1000000000);
429 scnprintf(port->logbuffer[port->logbuffer_head],
430 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
431 (unsigned long)ts_nsec, rem_nsec / 1000,
433 port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
436 mutex_unlock(&port->logbuffer_lock);
440 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
444 /* Do not log while disconnected and unattached */
445 if (tcpm_port_is_disconnected(port) &&
446 (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
447 port->state == DRP_TOGGLING))
451 _tcpm_log(port, fmt, args);
456 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
461 _tcpm_log(port, fmt, args);
465 static void tcpm_log_source_caps(struct tcpm_port *port)
469 for (i = 0; i < port->nr_source_caps; i++) {
470 u32 pdo = port->source_caps[i];
471 enum pd_pdo_type type = pdo_type(pdo);
476 scnprintf(msg, sizeof(msg),
477 "%u mV, %u mA [%s%s%s%s%s%s]",
478 pdo_fixed_voltage(pdo),
479 pdo_max_current(pdo),
480 (pdo & PDO_FIXED_DUAL_ROLE) ?
482 (pdo & PDO_FIXED_SUSPEND) ?
484 (pdo & PDO_FIXED_HIGHER_CAP) ?
486 (pdo & PDO_FIXED_USB_COMM) ?
488 (pdo & PDO_FIXED_DATA_SWAP) ?
490 (pdo & PDO_FIXED_EXTPOWER) ?
494 scnprintf(msg, sizeof(msg),
496 pdo_min_voltage(pdo),
497 pdo_max_voltage(pdo),
498 pdo_max_current(pdo));
501 scnprintf(msg, sizeof(msg),
503 pdo_min_voltage(pdo),
504 pdo_max_voltage(pdo),
508 strcpy(msg, "undefined");
511 tcpm_log(port, " PDO %d: type %d, %s",
516 static int tcpm_seq_show(struct seq_file *s, void *v)
518 struct tcpm_port *port = (struct tcpm_port *)s->private;
521 mutex_lock(&port->logbuffer_lock);
522 tail = port->logbuffer_tail;
523 while (tail != port->logbuffer_head) {
524 seq_printf(s, "%s\n", port->logbuffer[tail]);
525 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
527 if (!seq_has_overflowed(s))
528 port->logbuffer_tail = tail;
529 mutex_unlock(&port->logbuffer_lock);
534 static int tcpm_debug_open(struct inode *inode, struct file *file)
536 return single_open(file, tcpm_seq_show, inode->i_private);
539 static const struct file_operations tcpm_debug_operations = {
540 .open = tcpm_debug_open,
543 .release = single_release,
546 static struct dentry *rootdir;
548 static int tcpm_debugfs_init(struct tcpm_port *port)
550 mutex_init(&port->logbuffer_lock);
551 /* /sys/kernel/debug/tcpm/usbcX */
553 rootdir = debugfs_create_dir("tcpm", NULL);
558 port->dentry = debugfs_create_file(dev_name(port->dev),
559 S_IFREG | 0444, rootdir,
560 port, &tcpm_debug_operations);
565 static void tcpm_debugfs_exit(struct tcpm_port *port)
567 debugfs_remove(port->dentry);
573 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
575 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
576 static void tcpm_log_source_caps(struct tcpm_port *port) { }
577 static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
578 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
582 static int tcpm_pd_transmit(struct tcpm_port *port,
583 enum tcpm_transmit_type type,
584 const struct pd_message *msg)
586 unsigned long timeout;
590 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
592 tcpm_log(port, "PD TX, type: %#x", type);
594 reinit_completion(&port->tx_complete);
595 ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
599 mutex_unlock(&port->lock);
600 timeout = wait_for_completion_timeout(&port->tx_complete,
601 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
602 mutex_lock(&port->lock);
606 switch (port->tx_status) {
607 case TCPC_TX_SUCCESS:
608 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
610 case TCPC_TX_DISCARDED:
618 void tcpm_pd_transmit_complete(struct tcpm_port *port,
619 enum tcpm_transmit_status status)
621 tcpm_log(port, "PD TX complete, status: %u", status);
622 port->tx_status = status;
623 complete(&port->tx_complete);
625 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
627 static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
628 enum tcpc_usb_switch config)
632 tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
633 mode, config, port->polarity);
636 ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
642 static int tcpm_set_polarity(struct tcpm_port *port,
643 enum typec_cc_polarity polarity)
647 tcpm_log(port, "polarity %d", polarity);
649 ret = port->tcpc->set_polarity(port->tcpc, polarity);
653 port->polarity = polarity;
658 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
662 tcpm_log(port, "vconn:=%d", enable);
664 ret = port->tcpc->set_vconn(port->tcpc, enable);
666 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
667 typec_set_vconn_role(port->typec_port, port->vconn_role);
673 static u32 tcpm_get_current_limit(struct tcpm_port *port)
675 enum typec_cc_status cc;
678 cc = port->polarity ? port->cc2 : port->cc1;
680 case TYPEC_CC_RP_1_5:
683 case TYPEC_CC_RP_3_0:
686 case TYPEC_CC_RP_DEF:
688 if (port->tcpc->get_current_limit)
689 limit = port->tcpc->get_current_limit(port->tcpc);
698 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
700 int ret = -EOPNOTSUPP;
702 tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
704 if (port->tcpc->set_current_limit)
705 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
711 * Determine RP value to set based on maximum current supported
712 * by a port if configured as source.
713 * Returns CC value to report to link partner.
715 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
717 const u32 *src_pdo = port->src_pdo;
718 int nr_pdo = port->nr_src_pdo;
722 * Search for first entry with matching voltage.
723 * It should report the maximum supported current.
725 for (i = 0; i < nr_pdo; i++) {
726 const u32 pdo = src_pdo[i];
728 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
729 pdo_fixed_voltage(pdo) == 5000) {
730 unsigned int curr = pdo_max_current(pdo);
733 return TYPEC_CC_RP_3_0;
734 else if (curr >= 1500)
735 return TYPEC_CC_RP_1_5;
736 return TYPEC_CC_RP_DEF;
740 return TYPEC_CC_RP_DEF;
743 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
745 return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
749 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
750 enum typec_role role, enum typec_data_role data)
754 if (data == TYPEC_HOST)
755 ret = tcpm_mux_set(port, TYPEC_MUX_USB,
756 TCPC_USB_SWITCH_CONNECT);
758 ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
759 TCPC_USB_SWITCH_DISCONNECT);
763 ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
767 port->pwr_role = role;
768 port->data_role = data;
769 typec_set_data_role(port->typec_port, data);
770 typec_set_pwr_role(port->typec_port, role);
775 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
779 ret = port->tcpc->set_roles(port->tcpc, true, role,
784 port->pwr_role = role;
785 typec_set_pwr_role(port->typec_port, role);
790 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
792 struct pd_message msg;
795 memset(&msg, 0, sizeof(msg));
796 if (!port->nr_src_pdo) {
797 /* No source capabilities defined, sink only */
798 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
801 port->message_id, 0);
803 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
809 for (i = 0; i < port->nr_src_pdo; i++)
810 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
812 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
815 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
817 struct pd_message msg;
820 memset(&msg, 0, sizeof(msg));
821 if (!port->nr_snk_pdo) {
822 /* No sink capabilities defined, source only */
823 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
826 port->message_id, 0);
828 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
834 for (i = 0; i < port->nr_snk_pdo; i++)
835 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
837 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
840 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
841 unsigned int delay_ms)
844 tcpm_log(port, "pending state change %s -> %s @ %u ms",
845 tcpm_states[port->state], tcpm_states[state],
847 port->delayed_state = state;
848 mod_delayed_work(port->wq, &port->state_machine,
849 msecs_to_jiffies(delay_ms));
850 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
851 port->delay_ms = delay_ms;
853 tcpm_log(port, "state change %s -> %s",
854 tcpm_states[port->state], tcpm_states[state]);
855 port->delayed_state = INVALID_STATE;
856 port->prev_state = port->state;
859 * Don't re-queue the state machine work item if we're currently
860 * in the state machine and we're immediately changing states.
861 * tcpm_state_machine_work() will continue running the state
864 if (!port->state_machine_running)
865 mod_delayed_work(port->wq, &port->state_machine, 0);
869 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
870 unsigned int delay_ms)
872 if (port->enter_state == port->state)
873 tcpm_set_state(port, state, delay_ms);
876 "skipped %sstate change %s -> %s [%u ms], context state %s",
877 delay_ms ? "delayed " : "",
878 tcpm_states[port->state], tcpm_states[state],
879 delay_ms, tcpm_states[port->enter_state]);
882 static void tcpm_queue_message(struct tcpm_port *port,
883 enum pd_msg_request message)
885 port->queued_message = message;
886 mod_delayed_work(port->wq, &port->state_machine, 0);
890 * VDM/VDO handling functions
892 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
893 const u32 *data, int cnt)
895 port->vdo_count = cnt + 1;
896 port->vdo_data[0] = header;
897 memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
898 /* Set ready, vdm state machine will actually send */
899 port->vdm_retries = 0;
900 port->vdm_state = VDM_STATE_READY;
903 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
906 u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
907 u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
909 memset(&port->mode_data, 0, sizeof(port->mode_data));
911 #if 0 /* Not really a match */
912 switch (PD_IDH_PTYPE(vdo)) {
913 case IDH_PTYPE_UNDEF:
914 port->partner.type = TYPEC_PARTNER_NONE; /* no longer exists */
918 case IDH_PTYPE_PERIPH:
920 case IDH_PTYPE_PCABLE:
922 case IDH_PTYPE_ACABLE:
925 port->partner.type = TYPEC_PARTNER_ALTMODE;
932 port->partner_ident.id_header = vdo;
933 port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
934 port->partner_ident.product = product;
936 typec_partner_set_identity(port->partner);
938 tcpm_log(port, "Identity: %04x:%04x.%04x",
940 PD_PRODUCT_PID(product), product & 0xffff);
943 static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
946 struct pd_mode_data *pmdata = &port->mode_data;
949 for (i = 1; i < cnt; i++) {
950 u32 p = le32_to_cpu(payload[i]);
953 svid = (p >> 16) & 0xffff;
957 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
960 pmdata->svids[pmdata->nsvids++] = svid;
961 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
967 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
970 pmdata->svids[pmdata->nsvids++] = svid;
971 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
975 tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
979 static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
982 struct pd_mode_data *pmdata = &port->mode_data;
983 struct typec_altmode_desc *paltmode;
984 struct typec_mode_desc *pmode;
987 if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
988 /* Already logged in svdm_consume_svids() */
992 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
993 memset(paltmode, 0, sizeof(*paltmode));
995 paltmode->svid = pmdata->svids[pmdata->svid_index];
997 tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
998 pmdata->altmodes, paltmode->svid);
1000 for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
1001 pmode = &paltmode->modes[paltmode->n_modes];
1002 memset(pmode, 0, sizeof(*pmode));
1003 pmode->vdo = le32_to_cpu(payload[i]);
1004 pmode->index = i - 1;
1005 paltmode->n_modes++;
1006 tcpm_log(port, " VDO %d: 0x%08x",
1007 pmode->index, pmode->vdo);
1009 port->partner_altmode[pmdata->altmodes] =
1010 typec_partner_register_altmode(port->partner, paltmode);
1011 if (port->partner_altmode[pmdata->altmodes] == NULL) {
1013 "Failed to register alternate modes for SVID 0x%04x",
1020 #define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1022 static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1025 u32 p0 = le32_to_cpu(payload[0]);
1026 int cmd_type = PD_VDO_CMDT(p0);
1027 int cmd = PD_VDO_CMD(p0);
1028 struct pd_mode_data *modep;
1033 tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1034 p0, cmd_type, cmd, cnt);
1036 modep = &port->mode_data;
1041 case CMD_DISCOVER_IDENT:
1042 /* 6.4.4.3.1: Only respond as UFP (device) */
1043 if (port->data_role == TYPEC_DEVICE &&
1045 for (i = 0; i < port->nr_snk_vdo; i++)
1046 response[i + 1] = port->snk_vdo[i];
1047 rlen = port->nr_snk_vdo + 1;
1050 case CMD_DISCOVER_SVID:
1052 case CMD_DISCOVER_MODES:
1054 case CMD_ENTER_MODE:
1064 response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK);
1065 } else if (rlen == 0) {
1066 response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK);
1069 response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY);
1074 /* silently drop message if we are not connected */
1079 case CMD_DISCOVER_IDENT:
1081 svdm_consume_identity(port, payload, cnt);
1082 response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1085 case CMD_DISCOVER_SVID:
1087 if (svdm_consume_svids(port, payload, cnt)) {
1088 response[0] = VDO(USB_SID_PD, 1,
1091 } else if (modep->nsvids && supports_modal(port)) {
1092 response[0] = VDO(modep->svids[0], 1,
1093 CMD_DISCOVER_MODES);
1097 case CMD_DISCOVER_MODES:
1099 svdm_consume_modes(port, payload, cnt);
1100 modep->svid_index++;
1101 if (modep->svid_index < modep->nsvids) {
1102 svid = modep->svids[modep->svid_index];
1103 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1107 response[0] = pd_dfp_enter_mode(port, 0, 0);
1113 case CMD_ENTER_MODE:
1126 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1127 const __le32 *payload, int cnt)
1130 u32 response[8] = { };
1131 u32 p0 = le32_to_cpu(payload[0]);
1133 if (port->vdm_state == VDM_STATE_BUSY) {
1134 /* If UFP responded busy retry after timeout */
1135 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1136 port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1137 port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1139 mod_delayed_work(port->wq, &port->vdm_state_machine,
1140 msecs_to_jiffies(PD_T_VDM_BUSY));
1143 port->vdm_state = VDM_STATE_DONE;
1146 if (PD_VDO_SVDM(p0))
1147 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1150 rlen = tcpm_pd_custom_vdm(port, cnt, payload, response);
1154 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1155 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1159 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1160 const u32 *data, int count)
1164 if (WARN_ON(count > VDO_MAX_SIZE - 1))
1165 count = VDO_MAX_SIZE - 1;
1167 /* set VDM header with VID & CMD */
1168 header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1169 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1170 tcpm_queue_vdm(port, header, data, count);
1172 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1175 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1177 unsigned int timeout;
1178 int cmd = PD_VDO_CMD(vdm_hdr);
1180 /* its not a structured VDM command */
1181 if (!PD_VDO_SVDM(vdm_hdr))
1182 return PD_T_VDM_UNSTRUCTURED;
1184 switch (PD_VDO_CMDT(vdm_hdr)) {
1186 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1187 timeout = PD_T_VDM_WAIT_MODE_E;
1189 timeout = PD_T_VDM_SNDR_RSP;
1192 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1193 timeout = PD_T_VDM_E_MODE;
1195 timeout = PD_T_VDM_RCVR_RSP;
1201 static void vdm_run_state_machine(struct tcpm_port *port)
1203 struct pd_message msg;
1206 switch (port->vdm_state) {
1207 case VDM_STATE_READY:
1208 /* Only transmit VDM if attached */
1209 if (!port->attached) {
1210 port->vdm_state = VDM_STATE_ERR_BUSY;
1215 * if there's traffic or we're not in PDO ready state don't send
1218 if (port->state != SRC_READY && port->state != SNK_READY)
1221 /* Prepare and send VDM */
1222 memset(&msg, 0, sizeof(msg));
1223 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1226 port->message_id, port->vdo_count);
1227 for (i = 0; i < port->vdo_count; i++)
1228 msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1229 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1231 port->vdm_state = VDM_STATE_ERR_SEND;
1233 unsigned long timeout;
1235 port->vdm_retries = 0;
1236 port->vdm_state = VDM_STATE_BUSY;
1237 timeout = vdm_ready_timeout(port->vdo_data[0]);
1238 mod_delayed_work(port->wq, &port->vdm_state_machine,
1242 case VDM_STATE_WAIT_RSP_BUSY:
1243 port->vdo_data[0] = port->vdo_retry;
1244 port->vdo_count = 1;
1245 port->vdm_state = VDM_STATE_READY;
1247 case VDM_STATE_BUSY:
1248 port->vdm_state = VDM_STATE_ERR_TMOUT;
1250 case VDM_STATE_ERR_SEND:
1252 * A partner which does not support USB PD will not reply,
1253 * so this is not a fatal error. At the same time, some
1254 * devices may not return GoodCRC under some circumstances,
1255 * so we need to retry.
1257 if (port->vdm_retries < 3) {
1258 tcpm_log(port, "VDM Tx error, retry");
1259 port->vdm_retries++;
1260 port->vdm_state = VDM_STATE_READY;
1268 static void vdm_state_machine_work(struct work_struct *work)
1270 struct tcpm_port *port = container_of(work, struct tcpm_port,
1271 vdm_state_machine.work);
1272 enum vdm_states prev_state;
1274 mutex_lock(&port->lock);
1277 * Continue running as long as the port is not busy and there was
1281 prev_state = port->vdm_state;
1282 vdm_run_state_machine(port);
1283 } while (port->vdm_state != prev_state &&
1284 port->vdm_state != VDM_STATE_BUSY);
1286 mutex_unlock(&port->lock);
1290 * PD (data, control) command handling functions
1292 static void tcpm_pd_data_request(struct tcpm_port *port,
1293 const struct pd_message *msg)
1295 enum pd_data_msg_type type = pd_header_type_le(msg->header);
1296 unsigned int cnt = pd_header_cnt_le(msg->header);
1300 case PD_DATA_SOURCE_CAP:
1301 if (port->pwr_role != TYPEC_SINK)
1304 for (i = 0; i < cnt; i++)
1305 port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1307 port->nr_source_caps = cnt;
1309 tcpm_log_source_caps(port);
1312 * This message may be received even if VBUS is not
1313 * present. This is quite unexpected; see USB PD
1314 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1315 * However, at the same time, we must be ready to
1316 * receive this message and respond to it 15ms after
1317 * receiving PS_RDY during power swap operations, no matter
1318 * if VBUS is available or not (USB PD specification,
1320 * So we need to accept the message either way,
1321 * but be prepared to keep waiting for VBUS after it was
1324 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1326 case PD_DATA_REQUEST:
1327 if (port->pwr_role != TYPEC_SOURCE ||
1329 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1332 port->sink_request = le32_to_cpu(msg->payload[0]);
1333 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1335 case PD_DATA_SINK_CAP:
1336 /* We don't do anything with this at the moment... */
1337 for (i = 0; i < cnt; i++)
1338 port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1339 port->nr_sink_caps = cnt;
1341 case PD_DATA_VENDOR_DEF:
1342 tcpm_handle_vdm_request(port, msg->payload, cnt);
1345 if (port->state == SRC_READY || port->state == SNK_READY) {
1346 port->bist_request = le32_to_cpu(msg->payload[0]);
1347 tcpm_set_state(port, BIST_RX, 0);
1351 tcpm_log(port, "Unhandled data message type %#x", type);
1356 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1357 const struct pd_message *msg)
1359 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1360 enum tcpm_state next_state;
1363 case PD_CTRL_GOOD_CRC:
1366 case PD_CTRL_GET_SOURCE_CAP:
1367 switch (port->state) {
1370 tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1373 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1377 case PD_CTRL_GET_SINK_CAP:
1378 switch (port->state) {
1381 tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1384 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1388 case PD_CTRL_GOTO_MIN:
1390 case PD_CTRL_PS_RDY:
1391 switch (port->state) {
1392 case SNK_TRANSITION_SINK:
1393 if (port->vbus_present) {
1394 tcpm_set_current_limit(port,
1395 port->current_limit,
1396 port->supply_voltage);
1397 port->explicit_contract = true;
1398 tcpm_set_state(port, SNK_READY, 0);
1401 * Seen after power swap. Keep waiting for VBUS
1402 * in a transitional state.
1404 tcpm_set_state(port,
1405 SNK_TRANSITION_SINK_VBUS, 0);
1408 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1409 tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1411 case PR_SWAP_SNK_SRC_SINK_OFF:
1412 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1414 case VCONN_SWAP_WAIT_FOR_VCONN:
1415 tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1421 case PD_CTRL_REJECT:
1423 switch (port->state) {
1424 case SNK_NEGOTIATE_CAPABILITIES:
1425 /* USB PD specification, Figure 8-43 */
1426 if (port->explicit_contract)
1427 next_state = SNK_READY;
1429 next_state = SNK_WAIT_CAPABILITIES;
1430 tcpm_set_state(port, next_state, 0);
1433 port->swap_status = (type == PD_CTRL_WAIT ?
1434 -EAGAIN : -EOPNOTSUPP);
1435 tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1438 port->swap_status = (type == PD_CTRL_WAIT ?
1439 -EAGAIN : -EOPNOTSUPP);
1440 tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1442 case VCONN_SWAP_SEND:
1443 port->swap_status = (type == PD_CTRL_WAIT ?
1444 -EAGAIN : -EOPNOTSUPP);
1445 tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1451 case PD_CTRL_ACCEPT:
1452 switch (port->state) {
1453 case SNK_NEGOTIATE_CAPABILITIES:
1454 tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1456 case SOFT_RESET_SEND:
1457 port->message_id = 0;
1458 port->rx_msgid = -1;
1459 if (port->pwr_role == TYPEC_SOURCE)
1460 next_state = SRC_SEND_CAPABILITIES;
1462 next_state = SNK_WAIT_CAPABILITIES;
1463 tcpm_set_state(port, next_state, 0);
1466 tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1469 tcpm_set_state(port, PR_SWAP_START, 0);
1471 case VCONN_SWAP_SEND:
1472 tcpm_set_state(port, VCONN_SWAP_START, 0);
1478 case PD_CTRL_SOFT_RESET:
1479 tcpm_set_state(port, SOFT_RESET, 0);
1481 case PD_CTRL_DR_SWAP:
1482 if (port->port_type != TYPEC_PORT_DRP) {
1483 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1488 * 6.3.9: If an alternate mode is active, a request to swap
1489 * alternate modes shall trigger a port reset.
1491 switch (port->state) {
1494 tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1497 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1501 case PD_CTRL_PR_SWAP:
1502 if (port->port_type != TYPEC_PORT_DRP) {
1503 tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1506 switch (port->state) {
1509 tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1512 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1516 case PD_CTRL_VCONN_SWAP:
1517 switch (port->state) {
1520 tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1523 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1528 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1533 static void tcpm_pd_rx_handler(struct work_struct *work)
1535 struct pd_rx_event *event = container_of(work,
1536 struct pd_rx_event, work);
1537 const struct pd_message *msg = &event->msg;
1538 unsigned int cnt = pd_header_cnt_le(msg->header);
1539 struct tcpm_port *port = event->port;
1541 mutex_lock(&port->lock);
1543 tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1546 if (port->attached) {
1547 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1548 unsigned int msgid = pd_header_msgid_le(msg->header);
1551 * USB PD standard, 6.6.1.2:
1552 * "... if MessageID value in a received Message is the
1553 * same as the stored value, the receiver shall return a
1554 * GoodCRC Message with that MessageID value and drop
1555 * the Message (this is a retry of an already received
1556 * Message). Note: this shall not apply to the Soft_Reset
1557 * Message which always has a MessageID value of zero."
1559 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1561 port->rx_msgid = msgid;
1564 * If both ends believe to be DFP/host, we have a data role
1567 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1568 (port->data_role == TYPEC_HOST)) {
1570 "Data role mismatch, initiating error recovery");
1571 tcpm_set_state(port, ERROR_RECOVERY, 0);
1574 tcpm_pd_data_request(port, msg);
1576 tcpm_pd_ctrl_request(port, msg);
1581 mutex_unlock(&port->lock);
1585 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1587 struct pd_rx_event *event;
1589 event = kzalloc(sizeof(*event), GFP_ATOMIC);
1593 INIT_WORK(&event->work, tcpm_pd_rx_handler);
1595 memcpy(&event->msg, msg, sizeof(*msg));
1596 queue_work(port->wq, &event->work);
1598 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
1600 static int tcpm_pd_send_control(struct tcpm_port *port,
1601 enum pd_ctrl_msg_type type)
1603 struct pd_message msg;
1605 memset(&msg, 0, sizeof(msg));
1606 msg.header = PD_HEADER_LE(type, port->pwr_role,
1608 port->message_id, 0);
1610 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1614 * Send queued message without affecting state.
1615 * Return true if state machine should go back to sleep,
1618 static bool tcpm_send_queued_message(struct tcpm_port *port)
1620 enum pd_msg_request queued_message;
1623 queued_message = port->queued_message;
1624 port->queued_message = PD_MSG_NONE;
1626 switch (queued_message) {
1627 case PD_MSG_CTRL_WAIT:
1628 tcpm_pd_send_control(port, PD_CTRL_WAIT);
1630 case PD_MSG_CTRL_REJECT:
1631 tcpm_pd_send_control(port, PD_CTRL_REJECT);
1633 case PD_MSG_DATA_SINK_CAP:
1634 tcpm_pd_send_sink_caps(port);
1636 case PD_MSG_DATA_SOURCE_CAP:
1637 tcpm_pd_send_source_caps(port);
1642 } while (port->queued_message != PD_MSG_NONE);
1644 if (port->delayed_state != INVALID_STATE) {
1645 if (time_is_after_jiffies(port->delayed_runtime)) {
1646 mod_delayed_work(port->wq, &port->state_machine,
1647 port->delayed_runtime - jiffies);
1650 port->delayed_state = INVALID_STATE;
1655 static int tcpm_pd_check_request(struct tcpm_port *port)
1657 u32 pdo, rdo = port->sink_request;
1658 unsigned int max, op, pdo_max, index;
1659 enum pd_pdo_type type;
1661 index = rdo_index(rdo);
1662 if (!index || index > port->nr_src_pdo)
1665 pdo = port->src_pdo[index - 1];
1666 type = pdo_type(pdo);
1668 case PDO_TYPE_FIXED:
1670 max = rdo_max_current(rdo);
1671 op = rdo_op_current(rdo);
1672 pdo_max = pdo_max_current(pdo);
1676 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1679 if (type == PDO_TYPE_FIXED)
1681 "Requested %u mV, %u mA for %u / %u mA",
1682 pdo_fixed_voltage(pdo), pdo_max, op, max);
1685 "Requested %u -> %u mV, %u mA for %u / %u mA",
1686 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1690 max = rdo_max_power(rdo);
1691 op = rdo_op_power(rdo);
1692 pdo_max = pdo_max_power(pdo);
1696 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
1699 "Requested %u -> %u mV, %u mW for %u / %u mW",
1700 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
1707 port->op_vsafe5v = index == 1;
1712 static int tcpm_pd_select_pdo(struct tcpm_port *port)
1714 unsigned int i, max_mw = 0, max_mv = 0;
1718 * Select the source PDO providing the most power while staying within
1719 * the board's voltage limits. Prefer PDO providing exp
1721 for (i = 0; i < port->nr_source_caps; i++) {
1722 u32 pdo = port->source_caps[i];
1723 enum pd_pdo_type type = pdo_type(pdo);
1724 unsigned int mv, ma, mw;
1726 if (type == PDO_TYPE_FIXED)
1727 mv = pdo_fixed_voltage(pdo);
1729 mv = pdo_min_voltage(pdo);
1731 if (type == PDO_TYPE_BATT) {
1732 mw = pdo_max_power(pdo);
1734 ma = min(pdo_max_current(pdo),
1736 mw = ma * mv / 1000;
1739 /* Perfer higher voltages if available */
1740 if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
1741 mv <= port->max_snk_mv) {
1751 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
1753 unsigned int mv, ma, mw, flags;
1754 unsigned int max_ma, max_mw;
1755 enum pd_pdo_type type;
1759 index = tcpm_pd_select_pdo(port);
1762 pdo = port->source_caps[index];
1763 type = pdo_type(pdo);
1765 if (type == PDO_TYPE_FIXED)
1766 mv = pdo_fixed_voltage(pdo);
1768 mv = pdo_min_voltage(pdo);
1770 /* Select maximum available current within the board's power limit */
1771 if (type == PDO_TYPE_BATT) {
1772 mw = pdo_max_power(pdo);
1773 ma = 1000 * min(mw, port->max_snk_mw) / mv;
1775 ma = min(pdo_max_current(pdo),
1776 1000 * port->max_snk_mw / mv);
1778 ma = min(ma, port->max_snk_ma);
1780 flags = RDO_USB_COMM | RDO_NO_SUSPEND;
1782 /* Set mismatch bit if offered power is less than operating power */
1783 mw = ma * mv / 1000;
1786 if (mw < port->operating_snk_mw) {
1787 flags |= RDO_CAP_MISMATCH;
1788 max_mw = port->operating_snk_mw;
1789 max_ma = max_mw * 1000 / mv;
1792 tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
1793 port->cc_req, port->cc1, port->cc2, port->vbus_source,
1794 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
1797 if (type == PDO_TYPE_BATT) {
1798 *rdo = RDO_BATT(index + 1, mw, max_mw, flags);
1800 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
1802 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1804 *rdo = RDO_FIXED(index + 1, ma, max_ma, flags);
1806 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
1808 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
1811 port->current_limit = ma;
1812 port->supply_voltage = mv;
1817 static int tcpm_pd_send_request(struct tcpm_port *port)
1819 struct pd_message msg;
1823 ret = tcpm_pd_build_request(port, &rdo);
1827 memset(&msg, 0, sizeof(msg));
1828 msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
1831 port->message_id, 1);
1832 msg.payload[0] = cpu_to_le32(rdo);
1834 return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1837 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
1841 if (enable && port->vbus_charge)
1844 tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
1846 ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
1850 port->vbus_source = enable;
1854 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
1858 if (charge && port->vbus_source)
1861 if (charge != port->vbus_charge) {
1862 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
1863 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
1868 port->vbus_charge = charge;
1872 static bool tcpm_start_drp_toggling(struct tcpm_port *port)
1876 if (port->tcpc->start_drp_toggling &&
1877 port->port_type == TYPEC_PORT_DRP) {
1878 tcpm_log_force(port, "Start DRP toggling");
1879 ret = port->tcpc->start_drp_toggling(port->tcpc,
1888 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
1890 tcpm_log(port, "cc:=%d", cc);
1892 port->tcpc->set_cc(port->tcpc, cc);
1895 static int tcpm_init_vbus(struct tcpm_port *port)
1899 ret = port->tcpc->set_vbus(port->tcpc, false, false);
1900 port->vbus_source = false;
1901 port->vbus_charge = false;
1905 static int tcpm_init_vconn(struct tcpm_port *port)
1909 ret = port->tcpc->set_vconn(port->tcpc, false);
1910 port->vconn_role = TYPEC_SINK;
1914 static void tcpm_typec_connect(struct tcpm_port *port)
1916 if (!port->connected) {
1917 /* Make sure we don't report stale identity information */
1918 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
1919 port->partner_desc.usb_pd = port->pd_capable;
1920 if (tcpm_port_is_debug(port))
1921 port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
1922 else if (tcpm_port_is_audio(port))
1923 port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
1925 port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
1926 port->partner = typec_register_partner(port->typec_port,
1927 &port->partner_desc);
1928 port->connected = true;
1932 static int tcpm_src_attach(struct tcpm_port *port)
1934 enum typec_cc_polarity polarity =
1935 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
1936 : TYPEC_POLARITY_CC1;
1942 ret = tcpm_set_polarity(port, polarity);
1946 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
1950 ret = port->tcpc->set_pd_rx(port->tcpc, true);
1952 goto out_disable_mux;
1955 * USB Type-C specification, version 1.2,
1956 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
1957 * Enable VCONN only if the non-RD port is set to RA.
1959 if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
1960 (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
1961 ret = tcpm_set_vconn(port, true);
1963 goto out_disable_pd;
1966 ret = tcpm_set_vbus(port, true);
1968 goto out_disable_vconn;
1970 port->pd_capable = false;
1972 port->partner = NULL;
1974 port->attached = true;
1975 port->send_discover = true;
1980 tcpm_set_vconn(port, false);
1982 port->tcpc->set_pd_rx(port->tcpc, false);
1984 tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
1988 static void tcpm_typec_disconnect(struct tcpm_port *port)
1990 if (port->connected) {
1991 typec_unregister_partner(port->partner);
1992 port->partner = NULL;
1993 port->connected = false;
1997 static void tcpm_unregister_altmodes(struct tcpm_port *port)
1999 struct pd_mode_data *modep = &port->mode_data;
2002 for (i = 0; i < modep->altmodes; i++) {
2003 typec_unregister_altmode(port->partner_altmode[i]);
2004 port->partner_altmode[i] = NULL;
2007 memset(modep, 0, sizeof(*modep));
2010 static void tcpm_reset_port(struct tcpm_port *port)
2012 tcpm_unregister_altmodes(port);
2013 tcpm_typec_disconnect(port);
2014 port->attached = false;
2015 port->pd_capable = false;
2018 * First Rx ID should be 0; set this to a sentinel of -1 so that
2019 * we can check tcpm_pd_rx_handler() if we had seen it before.
2021 port->rx_msgid = -1;
2023 port->tcpc->set_pd_rx(port->tcpc, false);
2024 tcpm_init_vbus(port); /* also disables charging */
2025 tcpm_init_vconn(port);
2026 tcpm_set_current_limit(port, 0, 0);
2027 tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2028 tcpm_set_attached_state(port, false);
2029 port->try_src_count = 0;
2030 port->try_snk_count = 0;
2033 static void tcpm_detach(struct tcpm_port *port)
2035 if (!port->attached)
2038 if (tcpm_port_is_disconnected(port))
2039 port->hard_reset_count = 0;
2041 tcpm_reset_port(port);
2044 static void tcpm_src_detach(struct tcpm_port *port)
2049 static int tcpm_snk_attach(struct tcpm_port *port)
2056 ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2057 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2061 ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2065 port->pd_capable = false;
2067 port->partner = NULL;
2069 port->attached = true;
2070 port->send_discover = true;
2075 static void tcpm_snk_detach(struct tcpm_port *port)
2079 /* XXX: (Dis)connect SuperSpeed mux? */
2082 static int tcpm_acc_attach(struct tcpm_port *port)
2089 ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2093 port->partner = NULL;
2095 tcpm_typec_connect(port);
2097 port->attached = true;
2102 static void tcpm_acc_detach(struct tcpm_port *port)
2107 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2109 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2110 return HARD_RESET_SEND;
2111 if (port->pd_capable)
2112 return ERROR_RECOVERY;
2113 if (port->pwr_role == TYPEC_SOURCE)
2114 return SRC_UNATTACHED;
2115 if (port->state == SNK_WAIT_CAPABILITIES)
2117 return SNK_UNATTACHED;
2120 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2122 if (port->pwr_role == TYPEC_SOURCE)
2128 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2130 if (port->port_type == TYPEC_PORT_DRP) {
2131 if (port->pwr_role == TYPEC_SOURCE)
2132 return SRC_UNATTACHED;
2134 return SNK_UNATTACHED;
2135 } else if (port->port_type == TYPEC_PORT_DFP) {
2136 return SRC_UNATTACHED;
2139 return SNK_UNATTACHED;
2142 static void tcpm_check_send_discover(struct tcpm_port *port)
2144 if (port->data_role == TYPEC_HOST && port->send_discover &&
2146 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2147 port->send_discover = false;
2151 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2153 if (port->swap_pending) {
2154 port->swap_status = result;
2155 port->swap_pending = false;
2156 port->non_pd_role_swap = false;
2157 complete(&port->swap_complete);
2161 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2164 case TYPEC_CC_RP_1_5:
2165 return TYPEC_PWR_MODE_1_5A;
2166 case TYPEC_CC_RP_3_0:
2167 return TYPEC_PWR_MODE_3_0A;
2168 case TYPEC_CC_RP_DEF:
2170 return TYPEC_PWR_MODE_USB;
2174 static void run_state_machine(struct tcpm_port *port)
2177 enum typec_pwr_opmode opmode;
2180 port->enter_state = port->state;
2181 switch (port->state) {
2185 case SRC_UNATTACHED:
2186 if (!port->non_pd_role_swap)
2187 tcpm_swap_complete(port, -ENOTCONN);
2188 tcpm_src_detach(port);
2189 if (tcpm_start_drp_toggling(port)) {
2190 tcpm_set_state(port, DRP_TOGGLING, 0);
2193 tcpm_set_cc(port, tcpm_rp_cc(port));
2194 if (port->port_type == TYPEC_PORT_DRP)
2195 tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2197 case SRC_ATTACH_WAIT:
2198 if (tcpm_port_is_debug(port))
2199 tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2201 else if (tcpm_port_is_audio(port))
2202 tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2204 else if (tcpm_port_is_source(port))
2205 tcpm_set_state(port,
2206 tcpm_try_snk(port) ? SNK_TRY
2212 port->try_snk_count++;
2215 * - Do not drive vconn or vbus
2216 * - Terminate CC pins (both) to Rd
2218 * - Wait for tDRPTry (PD_T_DRP_TRY).
2219 * Until then, ignore any state changes.
2221 tcpm_set_cc(port, TYPEC_CC_RD);
2222 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2225 if (tcpm_port_is_sink(port)) {
2226 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2228 tcpm_set_state(port, SRC_TRYWAIT, 0);
2232 case SNK_TRY_WAIT_DEBOUNCE:
2233 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2236 case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2237 if (port->vbus_present && tcpm_port_is_sink(port)) {
2238 tcpm_set_state(port, SNK_ATTACHED, 0);
2240 tcpm_set_state(port, SRC_TRYWAIT, 0);
2245 tcpm_set_cc(port, tcpm_rp_cc(port));
2246 if (port->max_wait == 0) {
2247 port->max_wait = jiffies +
2248 msecs_to_jiffies(PD_T_DRP_TRY);
2249 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2252 if (time_is_after_jiffies(port->max_wait))
2253 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2254 jiffies_to_msecs(port->max_wait -
2257 tcpm_set_state(port, SNK_UNATTACHED, 0);
2260 case SRC_TRYWAIT_DEBOUNCE:
2261 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2263 case SRC_TRYWAIT_UNATTACHED:
2264 tcpm_set_state(port, SNK_UNATTACHED, 0);
2268 ret = tcpm_src_attach(port);
2269 tcpm_set_state(port, SRC_UNATTACHED,
2270 ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2273 opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2274 typec_set_pwr_opmode(port->typec_port, opmode);
2275 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2276 port->caps_count = 0;
2277 port->message_id = 0;
2278 port->rx_msgid = -1;
2279 port->explicit_contract = false;
2280 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2282 case SRC_SEND_CAPABILITIES:
2284 if (port->caps_count > PD_N_CAPS_COUNT) {
2285 tcpm_set_state(port, SRC_READY, 0);
2288 ret = tcpm_pd_send_source_caps(port);
2290 tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2291 PD_T_SEND_SOURCE_CAP);
2294 * Per standard, we should clear the reset counter here.
2295 * However, that can result in state machine hang-ups.
2296 * Reset it only in READY state to improve stability.
2298 /* port->hard_reset_count = 0; */
2299 port->caps_count = 0;
2300 port->pd_capable = true;
2301 tcpm_set_state_cond(port, hard_reset_state(port),
2302 PD_T_SEND_SOURCE_CAP);
2305 case SRC_NEGOTIATE_CAPABILITIES:
2306 ret = tcpm_pd_check_request(port);
2308 tcpm_pd_send_control(port, PD_CTRL_REJECT);
2309 if (!port->explicit_contract) {
2310 tcpm_set_state(port,
2311 SRC_WAIT_NEW_CAPABILITIES, 0);
2313 tcpm_set_state(port, SRC_READY, 0);
2316 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2317 tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
2318 PD_T_SRC_TRANSITION);
2321 case SRC_TRANSITION_SUPPLY:
2322 /* XXX: regulator_set_voltage(vbus, ...) */
2323 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2324 port->explicit_contract = true;
2325 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2326 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2327 tcpm_set_state_cond(port, SRC_READY, 0);
2331 port->hard_reset_count = 0;
2333 port->try_src_count = 0;
2335 tcpm_swap_complete(port, 0);
2336 tcpm_typec_connect(port);
2337 tcpm_check_send_discover(port);
2340 * Sending ping messages is not necessary if
2341 * - the source operates at vSafe5V
2343 * - The system is not operating in PD mode
2345 * - Both partners are connected using a Type-C connector
2347 * There is no actual need to send PD messages since the local
2348 * port type-c and the spec does not clearly say whether PD is
2349 * possible when type-c is connected to Type-A/B
2352 case SRC_WAIT_NEW_CAPABILITIES:
2353 /* Nothing to do... */
2357 case SNK_UNATTACHED:
2358 if (!port->non_pd_role_swap)
2359 tcpm_swap_complete(port, -ENOTCONN);
2360 tcpm_snk_detach(port);
2361 if (tcpm_start_drp_toggling(port)) {
2362 tcpm_set_state(port, DRP_TOGGLING, 0);
2365 tcpm_set_cc(port, TYPEC_CC_RD);
2366 if (port->port_type == TYPEC_PORT_DRP)
2367 tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
2369 case SNK_ATTACH_WAIT:
2370 if ((port->cc1 == TYPEC_CC_OPEN &&
2371 port->cc2 != TYPEC_CC_OPEN) ||
2372 (port->cc1 != TYPEC_CC_OPEN &&
2373 port->cc2 == TYPEC_CC_OPEN))
2374 tcpm_set_state(port, SNK_DEBOUNCED,
2376 else if (tcpm_port_is_disconnected(port))
2377 tcpm_set_state(port, SNK_UNATTACHED,
2381 if (tcpm_port_is_disconnected(port))
2382 tcpm_set_state(port, SNK_UNATTACHED,
2384 else if (port->vbus_present)
2385 tcpm_set_state(port,
2386 tcpm_try_src(port) ? SRC_TRY
2390 /* Wait for VBUS, but not forever */
2391 tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
2395 port->try_src_count++;
2396 tcpm_set_cc(port, tcpm_rp_cc(port));
2398 tcpm_set_state(port, SRC_TRY_WAIT, 0);
2401 if (port->max_wait == 0) {
2402 port->max_wait = jiffies +
2403 msecs_to_jiffies(PD_T_DRP_TRY);
2404 msecs = PD_T_DRP_TRY;
2406 if (time_is_after_jiffies(port->max_wait))
2407 msecs = jiffies_to_msecs(port->max_wait -
2412 tcpm_set_state(port, SNK_TRYWAIT, msecs);
2414 case SRC_TRY_DEBOUNCE:
2415 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
2418 tcpm_set_cc(port, TYPEC_CC_RD);
2419 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
2421 case SNK_TRYWAIT_VBUS:
2423 * TCPM stays in this state indefinitely until VBUS
2424 * is detected as long as Rp is not detected for
2425 * more than a time period of tPDDebounce.
2427 if (port->vbus_present && tcpm_port_is_sink(port)) {
2428 tcpm_set_state(port, SNK_ATTACHED, 0);
2431 if (!tcpm_port_is_sink(port))
2432 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
2434 case SNK_TRYWAIT_DEBOUNCE:
2435 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
2438 ret = tcpm_snk_attach(port);
2440 tcpm_set_state(port, SNK_UNATTACHED, 0);
2442 tcpm_set_state(port, SNK_STARTUP, 0);
2445 /* XXX: callback into infrastructure */
2446 opmode = tcpm_get_pwr_opmode(port->polarity ?
2447 port->cc2 : port->cc1);
2448 typec_set_pwr_opmode(port->typec_port, opmode);
2449 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2450 port->message_id = 0;
2451 port->rx_msgid = -1;
2452 port->explicit_contract = false;
2453 tcpm_set_state(port, SNK_DISCOVERY, 0);
2456 if (port->vbus_present) {
2457 tcpm_set_current_limit(port,
2458 tcpm_get_current_limit(port),
2460 tcpm_set_charge(port, true);
2461 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2465 * For DRP, timeouts differ. Also, handling is supposed to be
2466 * different and much more complex (dead battery detection;
2467 * see USB power delivery specification, section 8.3.3.6.1.5.1).
2469 tcpm_set_state(port, hard_reset_state(port),
2470 port->port_type == TYPEC_PORT_DRP ?
2471 PD_T_DB_DETECT : PD_T_NO_RESPONSE);
2473 case SNK_DISCOVERY_DEBOUNCE:
2474 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
2477 case SNK_DISCOVERY_DEBOUNCE_DONE:
2478 if (!tcpm_port_is_disconnected(port) &&
2479 tcpm_port_is_sink(port) &&
2480 time_is_after_jiffies(port->delayed_runtime)) {
2481 tcpm_set_state(port, SNK_DISCOVERY,
2482 jiffies_to_msecs(port->delayed_runtime -
2486 tcpm_set_state(port, unattached_state(port), 0);
2488 case SNK_WAIT_CAPABILITIES:
2489 ret = port->tcpc->set_pd_rx(port->tcpc, true);
2491 tcpm_set_state(port, SNK_READY, 0);
2495 * If VBUS has never been low, and we time out waiting
2496 * for source cap, try a soft reset first, in case we
2497 * were already in a stable contract before this boot.
2498 * Do this only once.
2500 if (port->vbus_never_low) {
2501 port->vbus_never_low = false;
2502 tcpm_set_state(port, SOFT_RESET_SEND,
2503 PD_T_SINK_WAIT_CAP);
2505 tcpm_set_state(port, hard_reset_state(port),
2506 PD_T_SINK_WAIT_CAP);
2509 case SNK_NEGOTIATE_CAPABILITIES:
2510 port->pd_capable = true;
2511 port->hard_reset_count = 0;
2512 ret = tcpm_pd_send_request(port);
2514 /* Let the Source send capabilities again. */
2515 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2517 tcpm_set_state_cond(port, hard_reset_state(port),
2518 PD_T_SENDER_RESPONSE);
2521 case SNK_TRANSITION_SINK:
2522 case SNK_TRANSITION_SINK_VBUS:
2523 tcpm_set_state(port, hard_reset_state(port),
2524 PD_T_PS_TRANSITION);
2527 port->try_snk_count = 0;
2528 if (port->explicit_contract) {
2529 typec_set_pwr_opmode(port->typec_port,
2531 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2534 tcpm_swap_complete(port, 0);
2535 tcpm_typec_connect(port);
2536 tcpm_check_send_discover(port);
2539 /* Accessory states */
2540 case ACC_UNATTACHED:
2541 tcpm_acc_detach(port);
2542 tcpm_set_state(port, SRC_UNATTACHED, 0);
2544 case DEBUG_ACC_ATTACHED:
2545 case AUDIO_ACC_ATTACHED:
2546 ret = tcpm_acc_attach(port);
2548 tcpm_set_state(port, ACC_UNATTACHED, 0);
2550 case AUDIO_ACC_DEBOUNCE:
2551 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
2554 /* Hard_Reset states */
2555 case HARD_RESET_SEND:
2556 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
2557 tcpm_set_state(port, HARD_RESET_START, 0);
2559 case HARD_RESET_START:
2560 port->hard_reset_count++;
2561 port->tcpc->set_pd_rx(port->tcpc, false);
2562 tcpm_unregister_altmodes(port);
2563 port->send_discover = true;
2564 if (port->pwr_role == TYPEC_SOURCE)
2565 tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
2566 PD_T_PS_HARD_RESET);
2568 tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
2570 case SRC_HARD_RESET_VBUS_OFF:
2571 tcpm_set_vconn(port, true);
2572 tcpm_set_vbus(port, false);
2573 tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
2574 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
2576 case SRC_HARD_RESET_VBUS_ON:
2577 tcpm_set_vbus(port, true);
2578 port->tcpc->set_pd_rx(port->tcpc, true);
2579 tcpm_set_attached_state(port, true);
2580 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
2582 case SNK_HARD_RESET_SINK_OFF:
2583 tcpm_set_vconn(port, false);
2584 tcpm_set_charge(port, false);
2585 tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
2587 * VBUS may or may not toggle, depending on the adapter.
2588 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
2589 * directly after timeout.
2591 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
2593 case SNK_HARD_RESET_WAIT_VBUS:
2594 /* Assume we're disconnected if VBUS doesn't come back. */
2595 tcpm_set_state(port, SNK_UNATTACHED,
2596 PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
2598 case SNK_HARD_RESET_SINK_ON:
2599 /* Note: There is no guarantee that VBUS is on in this state */
2602 * The specification suggests that dual mode ports in sink
2603 * mode should transition to state PE_SRC_Transition_to_default.
2604 * See USB power delivery specification chapter 8.3.3.6.1.3.
2605 * This would mean to to
2606 * - turn off VCONN, reset power supply
2607 * - request hardware reset
2609 * - Transition to state PE_Src_Startup
2610 * SNK only ports shall transition to state Snk_Startup
2611 * (see chapter 8.3.3.3.8).
2612 * Similar, dual-mode ports in source mode should transition
2613 * to PE_SNK_Transition_to_default.
2615 tcpm_set_attached_state(port, true);
2616 tcpm_set_state(port, SNK_STARTUP, 0);
2619 /* Soft_Reset states */
2621 port->message_id = 0;
2622 port->rx_msgid = -1;
2623 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2624 if (port->pwr_role == TYPEC_SOURCE)
2625 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2627 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2629 case SOFT_RESET_SEND:
2630 port->message_id = 0;
2631 port->rx_msgid = -1;
2632 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
2633 tcpm_set_state_cond(port, hard_reset_state(port), 0);
2635 tcpm_set_state_cond(port, hard_reset_state(port),
2636 PD_T_SENDER_RESPONSE);
2639 /* DR_Swap states */
2641 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
2642 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
2643 PD_T_SENDER_RESPONSE);
2645 case DR_SWAP_ACCEPT:
2646 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2647 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
2649 case DR_SWAP_SEND_TIMEOUT:
2650 tcpm_swap_complete(port, -ETIMEDOUT);
2651 tcpm_set_state(port, ready_state(port), 0);
2653 case DR_SWAP_CHANGE_DR:
2654 if (port->data_role == TYPEC_HOST) {
2655 tcpm_unregister_altmodes(port);
2656 tcpm_set_roles(port, true, port->pwr_role,
2659 tcpm_set_roles(port, true, port->pwr_role,
2661 port->send_discover = true;
2663 tcpm_set_state(port, ready_state(port), 0);
2666 /* PR_Swap states */
2667 case PR_SWAP_ACCEPT:
2668 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2669 tcpm_set_state(port, PR_SWAP_START, 0);
2672 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
2673 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
2674 PD_T_SENDER_RESPONSE);
2676 case PR_SWAP_SEND_TIMEOUT:
2677 tcpm_swap_complete(port, -ETIMEDOUT);
2678 tcpm_set_state(port, ready_state(port), 0);
2681 if (port->pwr_role == TYPEC_SOURCE)
2682 tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
2683 PD_T_SRC_TRANSITION);
2685 tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
2687 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
2688 tcpm_set_vbus(port, false);
2689 port->explicit_contract = false;
2690 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
2691 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
2694 case PR_SWAP_SRC_SNK_SOURCE_OFF:
2695 tcpm_set_cc(port, TYPEC_CC_RD);
2696 /* allow CC debounce */
2697 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
2700 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2702 * USB-PD standard, 6.2.1.4, Port Power Role:
2703 * "During the Power Role Swap Sequence, for the initial Source
2704 * Port, the Port Power Role field shall be set to Sink in the
2705 * PS_RDY Message indicating that the initial Source’s power
2706 * supply is turned off"
2708 tcpm_set_pwr_role(port, TYPEC_SINK);
2709 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
2710 tcpm_set_state(port, ERROR_RECOVERY, 0);
2713 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
2715 case PR_SWAP_SRC_SNK_SINK_ON:
2716 tcpm_set_state(port, SNK_STARTUP, 0);
2718 case PR_SWAP_SNK_SRC_SINK_OFF:
2719 tcpm_set_charge(port, false);
2720 tcpm_set_state(port, hard_reset_state(port),
2721 PD_T_PS_SOURCE_OFF);
2723 case PR_SWAP_SNK_SRC_SOURCE_ON:
2724 tcpm_set_cc(port, tcpm_rp_cc(port));
2725 tcpm_set_vbus(port, true);
2727 * allow time VBUS ramp-up, must be < tNewSrc
2728 * Also, this window overlaps with CC debounce as well.
2729 * So, Wait for the max of two which is PD_T_NEWSRC
2731 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
2734 case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
2736 * USB PD standard, 6.2.1.4:
2737 * "Subsequent Messages initiated by the Policy Engine,
2738 * such as the PS_RDY Message sent to indicate that Vbus
2739 * is ready, will have the Port Power Role field set to
2742 tcpm_set_pwr_role(port, TYPEC_SOURCE);
2743 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2744 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
2747 case VCONN_SWAP_ACCEPT:
2748 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2749 tcpm_set_state(port, VCONN_SWAP_START, 0);
2751 case VCONN_SWAP_SEND:
2752 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
2753 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
2754 PD_T_SENDER_RESPONSE);
2756 case VCONN_SWAP_SEND_TIMEOUT:
2757 tcpm_swap_complete(port, -ETIMEDOUT);
2758 tcpm_set_state(port, ready_state(port), 0);
2760 case VCONN_SWAP_START:
2761 if (port->vconn_role == TYPEC_SOURCE)
2762 tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
2764 tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
2766 case VCONN_SWAP_WAIT_FOR_VCONN:
2767 tcpm_set_state(port, hard_reset_state(port),
2768 PD_T_VCONN_SOURCE_ON);
2770 case VCONN_SWAP_TURN_ON_VCONN:
2771 tcpm_set_vconn(port, true);
2772 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2773 tcpm_set_state(port, ready_state(port), 0);
2775 case VCONN_SWAP_TURN_OFF_VCONN:
2776 tcpm_set_vconn(port, false);
2777 tcpm_set_state(port, ready_state(port), 0);
2780 case DR_SWAP_CANCEL:
2781 case PR_SWAP_CANCEL:
2782 case VCONN_SWAP_CANCEL:
2783 tcpm_swap_complete(port, port->swap_status);
2784 if (port->pwr_role == TYPEC_SOURCE)
2785 tcpm_set_state(port, SRC_READY, 0);
2787 tcpm_set_state(port, SNK_READY, 0);
2791 switch (BDO_MODE_MASK(port->bist_request)) {
2792 case BDO_MODE_CARRIER2:
2793 tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
2798 /* Always switch to unattached state */
2799 tcpm_set_state(port, unattached_state(port), 0);
2801 case ERROR_RECOVERY:
2802 tcpm_swap_complete(port, -EPROTO);
2803 tcpm_set_state(port, PORT_RESET, 0);
2806 tcpm_reset_port(port);
2807 tcpm_set_cc(port, TYPEC_CC_OPEN);
2808 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
2809 PD_T_ERROR_RECOVERY);
2811 case PORT_RESET_WAIT_OFF:
2812 tcpm_set_state(port,
2813 tcpm_default_state(port),
2814 port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
2817 WARN(1, "Unexpected port state %d\n", port->state);
2822 static void tcpm_state_machine_work(struct work_struct *work)
2824 struct tcpm_port *port = container_of(work, struct tcpm_port,
2825 state_machine.work);
2826 enum tcpm_state prev_state;
2828 mutex_lock(&port->lock);
2829 port->state_machine_running = true;
2831 if (port->queued_message && tcpm_send_queued_message(port))
2834 /* If we were queued due to a delayed state change, update it now */
2835 if (port->delayed_state) {
2836 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
2837 tcpm_states[port->state],
2838 tcpm_states[port->delayed_state], port->delay_ms);
2839 port->prev_state = port->state;
2840 port->state = port->delayed_state;
2841 port->delayed_state = INVALID_STATE;
2845 * Continue running as long as we have (non-delayed) state changes
2849 prev_state = port->state;
2850 run_state_machine(port);
2851 if (port->queued_message)
2852 tcpm_send_queued_message(port);
2853 } while (port->state != prev_state && !port->delayed_state);
2856 port->state_machine_running = false;
2857 mutex_unlock(&port->lock);
2860 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
2861 enum typec_cc_status cc2)
2863 enum typec_cc_status old_cc1, old_cc2;
2864 enum tcpm_state new_state;
2866 old_cc1 = port->cc1;
2867 old_cc2 = port->cc2;
2871 tcpm_log_force(port,
2872 "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
2873 old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
2875 tcpm_port_is_disconnected(port) ? "disconnected"
2878 switch (port->state) {
2880 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
2881 tcpm_port_is_source(port))
2882 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2883 else if (tcpm_port_is_sink(port))
2884 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2886 case SRC_UNATTACHED:
2887 case ACC_UNATTACHED:
2888 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
2889 tcpm_port_is_source(port))
2890 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2892 case SRC_ATTACH_WAIT:
2893 if (tcpm_port_is_disconnected(port) ||
2894 tcpm_port_is_audio_detached(port))
2895 tcpm_set_state(port, SRC_UNATTACHED, 0);
2896 else if (cc1 != old_cc1 || cc2 != old_cc2)
2897 tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
2900 case SRC_SEND_CAPABILITIES:
2902 if (tcpm_port_is_disconnected(port) ||
2903 !tcpm_port_is_source(port))
2904 tcpm_set_state(port, SRC_UNATTACHED, 0);
2906 case SNK_UNATTACHED:
2907 if (tcpm_port_is_sink(port))
2908 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2910 case SNK_ATTACH_WAIT:
2911 if ((port->cc1 == TYPEC_CC_OPEN &&
2912 port->cc2 != TYPEC_CC_OPEN) ||
2913 (port->cc1 != TYPEC_CC_OPEN &&
2914 port->cc2 == TYPEC_CC_OPEN))
2915 new_state = SNK_DEBOUNCED;
2916 else if (tcpm_port_is_disconnected(port))
2917 new_state = SNK_UNATTACHED;
2920 if (new_state != port->delayed_state)
2921 tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
2924 if (tcpm_port_is_disconnected(port))
2925 new_state = SNK_UNATTACHED;
2926 else if (port->vbus_present)
2927 new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
2929 new_state = SNK_UNATTACHED;
2930 if (new_state != port->delayed_state)
2931 tcpm_set_state(port, SNK_DEBOUNCED, 0);
2934 if (tcpm_port_is_disconnected(port))
2935 tcpm_set_state(port, unattached_state(port), 0);
2936 else if (!port->pd_capable &&
2937 (cc1 != old_cc1 || cc2 != old_cc2))
2938 tcpm_set_current_limit(port,
2939 tcpm_get_current_limit(port),
2943 case AUDIO_ACC_ATTACHED:
2944 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
2945 tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
2947 case AUDIO_ACC_DEBOUNCE:
2948 if (tcpm_port_is_audio(port))
2949 tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
2952 case DEBUG_ACC_ATTACHED:
2953 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
2954 tcpm_set_state(port, ACC_UNATTACHED, 0);
2958 /* Do nothing, waiting for timeout */
2962 /* CC line is unstable, wait for debounce */
2963 if (tcpm_port_is_disconnected(port))
2964 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
2966 case SNK_DISCOVERY_DEBOUNCE:
2970 /* Hand over to state machine if needed */
2971 if (!port->vbus_present && tcpm_port_is_source(port))
2972 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
2974 case SRC_TRYWAIT_DEBOUNCE:
2975 if (port->vbus_present || !tcpm_port_is_source(port))
2976 tcpm_set_state(port, SRC_TRYWAIT, 0);
2978 case SNK_TRY_WAIT_DEBOUNCE:
2979 if (!tcpm_port_is_sink(port)) {
2981 tcpm_set_state(port, SRC_TRYWAIT, 0);
2985 if (tcpm_port_is_source(port))
2986 tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
2988 case SRC_TRY_DEBOUNCE:
2989 tcpm_set_state(port, SRC_TRY_WAIT, 0);
2991 case SNK_TRYWAIT_DEBOUNCE:
2992 if (tcpm_port_is_sink(port))
2993 tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
2995 case SNK_TRYWAIT_VBUS:
2996 if (!tcpm_port_is_sink(port))
2997 tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3000 /* Do nothing, waiting for tCCDebounce */
3002 case PR_SWAP_SNK_SRC_SINK_OFF:
3003 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3004 case PR_SWAP_SRC_SNK_SOURCE_OFF:
3005 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3006 case PR_SWAP_SNK_SRC_SOURCE_ON:
3008 * CC state change is expected in PR_SWAP
3014 if (tcpm_port_is_disconnected(port))
3015 tcpm_set_state(port, unattached_state(port), 0);
3020 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3022 tcpm_log_force(port, "VBUS on");
3023 port->vbus_present = true;
3024 switch (port->state) {
3025 case SNK_TRANSITION_SINK_VBUS:
3026 port->explicit_contract = true;
3027 tcpm_set_state(port, SNK_READY, 0);
3030 tcpm_set_state(port, SNK_DISCOVERY, 0);
3034 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3038 case SNK_HARD_RESET_WAIT_VBUS:
3039 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3042 tcpm_set_state(port, SRC_STARTUP, 0);
3044 case SRC_HARD_RESET_VBUS_ON:
3045 tcpm_set_state(port, SRC_STARTUP, 0);
3049 /* Do nothing, waiting for timeout */
3052 /* Do nothing, Waiting for Rd to be detected */
3054 case SRC_TRYWAIT_DEBOUNCE:
3055 tcpm_set_state(port, SRC_TRYWAIT, 0);
3057 case SNK_TRY_WAIT_DEBOUNCE:
3058 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3061 /* Do nothing, waiting for tCCDebounce */
3063 case SNK_TRYWAIT_VBUS:
3064 if (tcpm_port_is_sink(port))
3065 tcpm_set_state(port, SNK_ATTACHED, 0);
3067 case SNK_TRYWAIT_DEBOUNCE:
3068 /* Do nothing, waiting for Rp */
3071 case SRC_TRY_DEBOUNCE:
3072 /* Do nothing, waiting for sink detection */
3079 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3081 tcpm_log_force(port, "VBUS off");
3082 port->vbus_present = false;
3083 port->vbus_never_low = false;
3084 switch (port->state) {
3085 case SNK_HARD_RESET_SINK_OFF:
3086 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3088 case SRC_HARD_RESET_VBUS_OFF:
3089 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3091 case HARD_RESET_SEND:
3095 /* Do nothing, waiting for timeout */
3098 /* Hand over to state machine if needed */
3099 if (tcpm_port_is_source(port))
3100 tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3102 case SNK_TRY_WAIT_DEBOUNCE:
3103 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3106 case SNK_TRYWAIT_VBUS:
3107 case SNK_TRYWAIT_DEBOUNCE:
3109 case SNK_ATTACH_WAIT:
3110 tcpm_set_state(port, SNK_UNATTACHED, 0);
3113 case SNK_NEGOTIATE_CAPABILITIES:
3116 case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3117 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3120 case PR_SWAP_SNK_SRC_SINK_OFF:
3121 /* Do nothing, expected */
3124 case PORT_RESET_WAIT_OFF:
3125 tcpm_set_state(port, tcpm_default_state(port), 0);
3128 case SRC_TRY_DEBOUNCE:
3129 /* Do nothing, waiting for sink detection */
3132 if (port->pwr_role == TYPEC_SINK &&
3134 tcpm_set_state(port, SNK_UNATTACHED, 0);
3139 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3141 tcpm_log_force(port, "Received hard reset");
3143 * If we keep receiving hard reset requests, executing the hard reset
3144 * must have failed. Revert to error recovery if that happens.
3146 tcpm_set_state(port,
3147 port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3148 HARD_RESET_START : ERROR_RECOVERY,
3152 static void tcpm_pd_event_handler(struct work_struct *work)
3154 struct tcpm_port *port = container_of(work, struct tcpm_port,
3158 mutex_lock(&port->lock);
3160 spin_lock(&port->pd_event_lock);
3161 while (port->pd_events) {
3162 events = port->pd_events;
3163 port->pd_events = 0;
3164 spin_unlock(&port->pd_event_lock);
3165 if (events & TCPM_RESET_EVENT)
3166 _tcpm_pd_hard_reset(port);
3167 if (events & TCPM_VBUS_EVENT) {
3170 vbus = port->tcpc->get_vbus(port->tcpc);
3172 _tcpm_pd_vbus_on(port);
3174 _tcpm_pd_vbus_off(port);
3176 if (events & TCPM_CC_EVENT) {
3177 enum typec_cc_status cc1, cc2;
3179 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3180 _tcpm_cc_change(port, cc1, cc2);
3182 spin_lock(&port->pd_event_lock);
3184 spin_unlock(&port->pd_event_lock);
3185 mutex_unlock(&port->lock);
3188 void tcpm_cc_change(struct tcpm_port *port)
3190 spin_lock(&port->pd_event_lock);
3191 port->pd_events |= TCPM_CC_EVENT;
3192 spin_unlock(&port->pd_event_lock);
3193 queue_work(port->wq, &port->event_work);
3195 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3197 void tcpm_vbus_change(struct tcpm_port *port)
3199 spin_lock(&port->pd_event_lock);
3200 port->pd_events |= TCPM_VBUS_EVENT;
3201 spin_unlock(&port->pd_event_lock);
3202 queue_work(port->wq, &port->event_work);
3204 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3206 void tcpm_pd_hard_reset(struct tcpm_port *port)
3208 spin_lock(&port->pd_event_lock);
3209 port->pd_events = TCPM_RESET_EVENT;
3210 spin_unlock(&port->pd_event_lock);
3211 queue_work(port->wq, &port->event_work);
3213 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3215 static int tcpm_dr_set(const struct typec_capability *cap,
3216 enum typec_data_role data)
3218 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3221 mutex_lock(&port->swap_lock);
3222 mutex_lock(&port->lock);
3224 if (port->port_type != TYPEC_PORT_DRP) {
3228 if (port->state != SRC_READY && port->state != SNK_READY) {
3233 if (port->data_role == data) {
3240 * 6.3.9: If an alternate mode is active, a request to swap
3241 * alternate modes shall trigger a port reset.
3242 * Reject data role swap request in this case.
3245 if (!port->pd_capable) {
3247 * If the partner is not PD capable, reset the port to
3248 * trigger a role change. This can only work if a preferred
3249 * role is configured, and if it matches the requested role.
3251 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
3252 port->try_role == port->pwr_role) {
3256 port->non_pd_role_swap = true;
3257 tcpm_set_state(port, PORT_RESET, 0);
3259 tcpm_set_state(port, DR_SWAP_SEND, 0);
3262 port->swap_status = 0;
3263 port->swap_pending = true;
3264 reinit_completion(&port->swap_complete);
3265 mutex_unlock(&port->lock);
3267 if (!wait_for_completion_timeout(&port->swap_complete,
3268 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3271 ret = port->swap_status;
3273 port->non_pd_role_swap = false;
3277 mutex_unlock(&port->lock);
3279 mutex_unlock(&port->swap_lock);
3283 static int tcpm_pr_set(const struct typec_capability *cap,
3284 enum typec_role role)
3286 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3289 mutex_lock(&port->swap_lock);
3290 mutex_lock(&port->lock);
3292 if (port->port_type != TYPEC_PORT_DRP) {
3296 if (port->state != SRC_READY && port->state != SNK_READY) {
3301 if (role == port->pwr_role) {
3306 port->swap_status = 0;
3307 port->swap_pending = true;
3308 reinit_completion(&port->swap_complete);
3309 tcpm_set_state(port, PR_SWAP_SEND, 0);
3310 mutex_unlock(&port->lock);
3312 if (!wait_for_completion_timeout(&port->swap_complete,
3313 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3316 ret = port->swap_status;
3321 mutex_unlock(&port->lock);
3323 mutex_unlock(&port->swap_lock);
3327 static int tcpm_vconn_set(const struct typec_capability *cap,
3328 enum typec_role role)
3330 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3333 mutex_lock(&port->swap_lock);
3334 mutex_lock(&port->lock);
3336 if (port->state != SRC_READY && port->state != SNK_READY) {
3341 if (role == port->vconn_role) {
3346 port->swap_status = 0;
3347 port->swap_pending = true;
3348 reinit_completion(&port->swap_complete);
3349 tcpm_set_state(port, VCONN_SWAP_SEND, 0);
3350 mutex_unlock(&port->lock);
3352 if (!wait_for_completion_timeout(&port->swap_complete,
3353 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3356 ret = port->swap_status;
3361 mutex_unlock(&port->lock);
3363 mutex_unlock(&port->swap_lock);
3367 static int tcpm_try_role(const struct typec_capability *cap, int role)
3369 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3370 struct tcpc_dev *tcpc = port->tcpc;
3373 mutex_lock(&port->lock);
3375 ret = tcpc->try_role(tcpc, role);
3376 if (!ret && !tcpc->config->try_role_hw)
3377 port->try_role = role;
3378 port->try_src_count = 0;
3379 port->try_snk_count = 0;
3380 mutex_unlock(&port->lock);
3385 static void tcpm_init(struct tcpm_port *port)
3387 enum typec_cc_status cc1, cc2;
3389 port->tcpc->init(port->tcpc);
3391 tcpm_reset_port(port);
3395 * Should possibly wait for VBUS to settle if it was enabled locally
3396 * since tcpm_reset_port() will disable VBUS.
3398 port->vbus_present = port->tcpc->get_vbus(port->tcpc);
3399 if (port->vbus_present)
3400 port->vbus_never_low = true;
3402 tcpm_set_state(port, tcpm_default_state(port), 0);
3404 if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3405 _tcpm_cc_change(port, cc1, cc2);
3408 * Some adapters need a clean slate at startup, and won't recover
3409 * otherwise. So do not try to be fancy and force a clean disconnect.
3411 tcpm_set_state(port, PORT_RESET, 0);
3414 static int tcpm_port_type_set(const struct typec_capability *cap,
3415 enum typec_port_type type)
3417 struct tcpm_port *port = typec_cap_to_tcpm(cap);
3419 mutex_lock(&port->lock);
3420 if (type == port->port_type)
3423 port->port_type = type;
3425 if (!port->connected) {
3426 tcpm_set_state(port, PORT_RESET, 0);
3427 } else if (type == TYPEC_PORT_UFP) {
3428 if (!(port->pwr_role == TYPEC_SINK &&
3429 port->data_role == TYPEC_DEVICE))
3430 tcpm_set_state(port, PORT_RESET, 0);
3431 } else if (type == TYPEC_PORT_DFP) {
3432 if (!(port->pwr_role == TYPEC_SOURCE &&
3433 port->data_role == TYPEC_HOST))
3434 tcpm_set_state(port, PORT_RESET, 0);
3438 mutex_unlock(&port->lock);
3442 void tcpm_tcpc_reset(struct tcpm_port *port)
3444 mutex_lock(&port->lock);
3445 /* XXX: Maintain PD connection if possible? */
3447 mutex_unlock(&port->lock);
3449 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
3451 static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
3452 unsigned int nr_pdo)
3456 if (nr_pdo > PDO_MAX_OBJECTS)
3457 nr_pdo = PDO_MAX_OBJECTS;
3459 for (i = 0; i < nr_pdo; i++)
3460 dest_pdo[i] = src_pdo[i];
3465 static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
3466 unsigned int nr_vdo)
3470 if (nr_vdo > VDO_MAX_OBJECTS)
3471 nr_vdo = VDO_MAX_OBJECTS;
3473 for (i = 0; i < nr_vdo; i++)
3474 dest_vdo[i] = src_vdo[i];
3479 void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
3480 unsigned int nr_pdo)
3482 mutex_lock(&port->lock);
3483 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
3484 switch (port->state) {
3485 case SRC_UNATTACHED:
3486 case SRC_ATTACH_WAIT:
3488 tcpm_set_cc(port, tcpm_rp_cc(port));
3490 case SRC_SEND_CAPABILITIES:
3491 case SRC_NEGOTIATE_CAPABILITIES:
3493 case SRC_WAIT_NEW_CAPABILITIES:
3494 tcpm_set_cc(port, tcpm_rp_cc(port));
3495 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3500 mutex_unlock(&port->lock);
3502 EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
3504 void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
3505 unsigned int nr_pdo,
3506 unsigned int max_snk_mv,
3507 unsigned int max_snk_ma,
3508 unsigned int max_snk_mw,
3509 unsigned int operating_snk_mw)
3511 mutex_lock(&port->lock);
3512 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
3513 port->max_snk_mv = max_snk_mv;
3514 port->max_snk_ma = max_snk_ma;
3515 port->max_snk_mw = max_snk_mw;
3516 port->operating_snk_mw = operating_snk_mw;
3518 switch (port->state) {
3519 case SNK_NEGOTIATE_CAPABILITIES:
3521 case SNK_TRANSITION_SINK:
3522 case SNK_TRANSITION_SINK_VBUS:
3523 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3528 mutex_unlock(&port->lock);
3530 EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
3532 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
3534 struct tcpm_port *port;
3537 if (!dev || !tcpc || !tcpc->config ||
3538 !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
3539 !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
3540 !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
3541 return ERR_PTR(-EINVAL);
3543 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
3545 return ERR_PTR(-ENOMEM);
3550 mutex_init(&port->lock);
3551 mutex_init(&port->swap_lock);
3553 port->wq = create_singlethread_workqueue(dev_name(dev));
3555 return ERR_PTR(-ENOMEM);
3556 INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
3557 INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
3558 INIT_WORK(&port->event_work, tcpm_pd_event_handler);
3560 spin_lock_init(&port->pd_event_lock);
3562 init_completion(&port->tx_complete);
3563 init_completion(&port->swap_complete);
3565 port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo,
3566 tcpc->config->nr_src_pdo);
3567 port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
3568 tcpc->config->nr_snk_pdo);
3569 port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcpc->config->snk_vdo,
3570 tcpc->config->nr_snk_vdo);
3572 port->max_snk_mv = tcpc->config->max_snk_mv;
3573 port->max_snk_ma = tcpc->config->max_snk_ma;
3574 port->max_snk_mw = tcpc->config->max_snk_mw;
3575 port->operating_snk_mw = tcpc->config->operating_snk_mw;
3576 if (!tcpc->config->try_role_hw)
3577 port->try_role = tcpc->config->default_role;
3579 port->try_role = TYPEC_NO_PREFERRED_ROLE;
3581 port->typec_caps.prefer_role = tcpc->config->default_role;
3582 port->typec_caps.type = tcpc->config->type;
3583 port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
3584 port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */
3585 port->typec_caps.dr_set = tcpm_dr_set;
3586 port->typec_caps.pr_set = tcpm_pr_set;
3587 port->typec_caps.vconn_set = tcpm_vconn_set;
3588 port->typec_caps.try_role = tcpm_try_role;
3589 port->typec_caps.port_type_set = tcpm_port_type_set;
3591 port->partner_desc.identity = &port->partner_ident;
3592 port->port_type = tcpc->config->type;
3595 * - alt_modes, set_alt_mode
3596 * - {debug,audio}_accessory
3599 port->typec_port = typec_register_port(port->dev, &port->typec_caps);
3600 if (!port->typec_port) {
3602 goto out_destroy_wq;
3605 if (tcpc->config->alt_modes) {
3606 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
3609 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
3610 port->port_altmode[i] =
3611 typec_port_register_altmode(port->typec_port,
3613 if (!port->port_altmode[i]) {
3615 "%s: failed to register port alternate mode 0x%x",
3616 dev_name(dev), paltmode->svid);
3624 tcpm_debugfs_init(port);
3625 mutex_lock(&port->lock);
3627 mutex_unlock(&port->lock);
3629 tcpm_log(port, "%s: registered", dev_name(dev));
3633 destroy_workqueue(port->wq);
3634 return ERR_PTR(err);
3636 EXPORT_SYMBOL_GPL(tcpm_register_port);
3638 void tcpm_unregister_port(struct tcpm_port *port)
3642 for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
3643 typec_unregister_altmode(port->port_altmode[i]);
3644 typec_unregister_port(port->typec_port);
3645 tcpm_debugfs_exit(port);
3646 destroy_workqueue(port->wq);
3648 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
3650 MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
3651 MODULE_DESCRIPTION("USB Type-C Port Manager");
3652 MODULE_LICENSE("GPL");