1 // SPDX-License-Identifier: GPL-2.0
3 * USB Type-C Connector System Software Interface driver
5 * Copyright (C) 2017, Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
9 #include <linux/completion.h>
10 #include <linux/property.h>
11 #include <linux/device.h>
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/usb/typec_dp.h>
21 * UCSI_TIMEOUT_MS - PPM communication timeout
23 * Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI
24 * specification) here as reference, but unfortunately we can't. It is very
25 * difficult to estimate the time it takes for the system to process the command
26 * before it is actually passed to the PPM.
28 #define UCSI_TIMEOUT_MS 5000
31 * UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests
33 * 5 seconds is close to the time it takes for CapsCounter to reach 0, so even
34 * if the PPM does not generate Connector Change events before that with
35 * partners that do not support USB Power Delivery, this should still work.
37 #define UCSI_SWAP_TIMEOUT_MS 5000
39 static int ucsi_acknowledge_command(struct ucsi *ucsi)
43 ctrl = UCSI_ACK_CC_CI;
44 ctrl |= UCSI_ACK_COMMAND_COMPLETE;
46 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
49 static int ucsi_acknowledge_connector_change(struct ucsi *ucsi)
53 ctrl = UCSI_ACK_CC_CI;
54 ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
56 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
59 static int ucsi_exec_command(struct ucsi *ucsi, u64 command);
61 static int ucsi_read_error(struct ucsi *ucsi)
66 /* Acknowledge the command that failed */
67 ret = ucsi_acknowledge_command(ucsi);
71 ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS);
75 ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error));
80 case UCSI_ERROR_INCOMPATIBLE_PARTNER:
82 case UCSI_ERROR_CC_COMMUNICATION_ERR:
84 case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
86 case UCSI_ERROR_DEAD_BATTERY:
87 dev_warn(ucsi->dev, "Dead battery condition!\n");
89 case UCSI_ERROR_INVALID_CON_NUM:
90 case UCSI_ERROR_UNREGONIZED_CMD:
91 case UCSI_ERROR_INVALID_CMD_ARGUMENT:
92 dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error);
94 case UCSI_ERROR_OVERCURRENT:
95 dev_warn(ucsi->dev, "Overcurrent condition\n");
97 case UCSI_ERROR_PARTNER_REJECTED_SWAP:
98 dev_warn(ucsi->dev, "Partner rejected swap\n");
100 case UCSI_ERROR_HARD_RESET:
101 dev_warn(ucsi->dev, "Hard reset occurred\n");
103 case UCSI_ERROR_PPM_POLICY_CONFLICT:
104 dev_warn(ucsi->dev, "PPM Policy conflict\n");
106 case UCSI_ERROR_SWAP_REJECTED:
107 dev_warn(ucsi->dev, "Swap rejected\n");
109 case UCSI_ERROR_UNDEFINED:
111 dev_err(ucsi->dev, "unknown error %u\n", error);
118 static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
123 ret = ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
127 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
131 if (cci & UCSI_CCI_BUSY) {
132 ucsi->ops->async_write(ucsi, UCSI_CANCEL, NULL, 0);
136 if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
139 if (cci & UCSI_CCI_NOT_SUPPORTED)
142 if (cci & UCSI_CCI_ERROR) {
143 if (cmd == UCSI_GET_ERROR_STATUS)
145 return ucsi_read_error(ucsi);
148 return UCSI_CCI_LENGTH(cci);
151 int ucsi_send_command(struct ucsi *ucsi, u64 command,
152 void *data, size_t size)
157 mutex_lock(&ucsi->ppm_lock);
159 ret = ucsi_exec_command(ucsi, command);
166 ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size);
171 ret = ucsi_acknowledge_command(ucsi);
177 mutex_unlock(&ucsi->ppm_lock);
180 EXPORT_SYMBOL_GPL(ucsi_send_command);
182 int ucsi_resume(struct ucsi *ucsi)
186 /* Restore UCSI notification enable mask after system resume */
187 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
189 return ucsi_send_command(ucsi, command, NULL, 0);
191 EXPORT_SYMBOL_GPL(ucsi_resume);
192 /* -------------------------------------------------------------------------- */
195 struct delayed_work work;
198 struct ucsi_connector *con;
199 int (*cb)(struct ucsi_connector *);
202 static void ucsi_poll_worker(struct work_struct *work)
204 struct ucsi_work *uwork = container_of(work, struct ucsi_work, work.work);
205 struct ucsi_connector *con = uwork->con;
208 mutex_lock(&con->lock);
211 mutex_unlock(&con->lock);
216 ret = uwork->cb(con);
218 if (uwork->count-- && (ret == -EBUSY || ret == -ETIMEDOUT))
219 queue_delayed_work(con->wq, &uwork->work, uwork->delay);
223 mutex_unlock(&con->lock);
226 static int ucsi_partner_task(struct ucsi_connector *con,
227 int (*cb)(struct ucsi_connector *),
228 int retries, unsigned long delay)
230 struct ucsi_work *uwork;
235 uwork = kzalloc(sizeof(*uwork), GFP_KERNEL);
239 INIT_DELAYED_WORK(&uwork->work, ucsi_poll_worker);
240 uwork->count = retries;
241 uwork->delay = delay;
245 queue_delayed_work(con->wq, &uwork->work, delay);
250 /* -------------------------------------------------------------------------- */
252 void ucsi_altmode_update_active(struct ucsi_connector *con)
254 const struct typec_altmode *altmode = NULL;
260 command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num);
261 ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur));
263 if (con->ucsi->version > 0x0100) {
264 dev_err(con->ucsi->dev,
265 "GET_CURRENT_CAM command failed\n");
271 if (cur < UCSI_MAX_ALTMODES)
272 altmode = typec_altmode_get_partner(con->port_altmode[cur]);
274 for (i = 0; con->partner_altmode[i]; i++)
275 typec_altmode_update_active(con->partner_altmode[i],
276 con->partner_altmode[i] == altmode);
279 static int ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid)
284 for (i = 0; alt[i]; i++) {
285 if (i > MODE_DISCOVERY_MAX)
288 if (alt[i]->svid == svid)
295 static int ucsi_next_altmode(struct typec_altmode **alt)
299 for (i = 0; i < UCSI_MAX_ALTMODES; i++)
306 static int ucsi_register_altmode(struct ucsi_connector *con,
307 struct typec_altmode_desc *desc,
310 struct typec_altmode *alt;
315 override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE);
318 case UCSI_RECIPIENT_CON:
319 i = ucsi_next_altmode(con->port_altmode);
325 ret = ucsi_altmode_next_mode(con->port_altmode, desc->svid);
331 switch (desc->svid) {
332 case USB_TYPEC_DP_SID:
333 alt = ucsi_register_displayport(con, override, i, desc);
335 case USB_TYPEC_NVIDIA_VLINK_SID:
336 if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO)
337 alt = typec_port_register_altmode(con->port,
340 alt = ucsi_register_displayport(con, override,
344 alt = typec_port_register_altmode(con->port, desc);
353 con->port_altmode[i] = alt;
355 case UCSI_RECIPIENT_SOP:
356 i = ucsi_next_altmode(con->partner_altmode);
362 ret = ucsi_altmode_next_mode(con->partner_altmode, desc->svid);
368 alt = typec_partner_register_altmode(con->partner, desc);
374 con->partner_altmode[i] = alt;
380 trace_ucsi_register_altmode(recipient, alt);
385 dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n",
386 desc->svid, desc->mode);
392 ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient)
394 int max_altmodes = UCSI_MAX_ALTMODES;
395 struct typec_altmode_desc desc;
396 struct ucsi_altmode alt;
397 struct ucsi_altmode orig[UCSI_MAX_ALTMODES];
398 struct ucsi_altmode updated[UCSI_MAX_ALTMODES];
399 struct ucsi *ucsi = con->ucsi;
400 bool multi_dp = false;
407 if (recipient == UCSI_RECIPIENT_CON)
408 max_altmodes = con->ucsi->cap.num_alt_modes;
410 memset(orig, 0, sizeof(orig));
411 memset(updated, 0, sizeof(updated));
413 /* First get all the alternate modes */
414 for (i = 0; i < max_altmodes; i++) {
415 memset(&alt, 0, sizeof(alt));
416 command = UCSI_GET_ALTERNATE_MODES;
417 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
418 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
419 command |= UCSI_GET_ALTMODE_OFFSET(i);
420 len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt));
422 * We are collecting all altmodes first and then registering.
423 * Some type-C device will return zero length data beyond last
424 * alternate modes. We should not return if length is zero.
429 /* We got all altmodes, now break out and register them */
430 if (!len || !alt.svid)
433 orig[k].mid = alt.mid;
434 orig[k].svid = alt.svid;
438 * Update the original altmode table as some ppms may report
439 * multiple DP altmodes.
441 if (recipient == UCSI_RECIPIENT_CON)
442 multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated);
444 /* now register altmodes */
445 for (i = 0; i < max_altmodes; i++) {
446 memset(&desc, 0, sizeof(desc));
447 if (multi_dp && recipient == UCSI_RECIPIENT_CON) {
448 desc.svid = updated[i].svid;
449 desc.vdo = updated[i].mid;
451 desc.svid = orig[i].svid;
452 desc.vdo = orig[i].mid;
454 desc.roles = TYPEC_PORT_DRD;
459 ret = ucsi_register_altmode(con, &desc, recipient);
467 static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient)
469 int max_altmodes = UCSI_MAX_ALTMODES;
470 struct typec_altmode_desc desc;
471 struct ucsi_altmode alt[2];
479 if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS))
482 if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0])
485 if (con->ucsi->ops->update_altmodes)
486 return ucsi_register_altmodes_nvidia(con, recipient);
488 if (recipient == UCSI_RECIPIENT_CON)
489 max_altmodes = con->ucsi->cap.num_alt_modes;
491 for (i = 0; i < max_altmodes;) {
492 memset(alt, 0, sizeof(alt));
493 command = UCSI_GET_ALTERNATE_MODES;
494 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
495 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
496 command |= UCSI_GET_ALTMODE_OFFSET(i);
497 len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt));
504 * This code is requesting one alt mode at a time, but some PPMs
505 * may still return two. If that happens both alt modes need be
506 * registered and the offset for the next alt mode has to be
509 num = len / sizeof(alt[0]);
512 for (j = 0; j < num; j++) {
516 memset(&desc, 0, sizeof(desc));
517 desc.vdo = alt[j].mid;
518 desc.svid = alt[j].svid;
519 desc.roles = TYPEC_PORT_DRD;
521 ret = ucsi_register_altmode(con, &desc, recipient);
530 static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient)
532 const struct typec_altmode *pdev;
533 struct typec_altmode **adev;
537 case UCSI_RECIPIENT_CON:
538 adev = con->port_altmode;
540 case UCSI_RECIPIENT_SOP:
541 adev = con->partner_altmode;
548 if (recipient == UCSI_RECIPIENT_SOP &&
549 (adev[i]->svid == USB_TYPEC_DP_SID ||
550 (adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID &&
551 adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) {
552 pdev = typec_altmode_get_partner(adev[i]);
553 ucsi_displayport_remove_partner((void *)pdev);
555 typec_unregister_altmode(adev[i]);
560 static int ucsi_get_pdos(struct ucsi_connector *con, int is_partner,
561 u32 *pdos, int offset, int num_pdos)
563 struct ucsi *ucsi = con->ucsi;
567 command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num);
568 command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner);
569 command |= UCSI_GET_PDOS_PDO_OFFSET(offset);
570 command |= UCSI_GET_PDOS_NUM_PDOS(num_pdos - 1);
571 command |= UCSI_GET_PDOS_SRC_PDOS;
572 ret = ucsi_send_command(ucsi, command, pdos + offset,
573 num_pdos * sizeof(u32));
574 if (ret < 0 && ret != -ETIMEDOUT)
575 dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
576 if (ret == 0 && offset == 0)
577 dev_warn(ucsi->dev, "UCSI_GET_PDOS returned 0 bytes\n");
582 static int ucsi_get_src_pdos(struct ucsi_connector *con)
586 /* UCSI max payload means only getting at most 4 PDOs at a time */
587 ret = ucsi_get_pdos(con, 1, con->src_pdos, 0, UCSI_MAX_PDOS);
591 con->num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */
592 if (con->num_pdos < UCSI_MAX_PDOS)
595 /* get the remaining PDOs, if any */
596 ret = ucsi_get_pdos(con, 1, con->src_pdos, UCSI_MAX_PDOS,
597 PDO_MAX_OBJECTS - UCSI_MAX_PDOS);
601 con->num_pdos += ret / sizeof(u32);
603 ucsi_port_psy_changed(con);
608 static int ucsi_check_altmodes(struct ucsi_connector *con)
612 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
613 if (ret && ret != -ETIMEDOUT)
614 dev_err(con->ucsi->dev,
615 "con%d: failed to register partner alt modes (%d)\n",
618 /* Ignoring the errors in this case. */
619 if (con->partner_altmode[0]) {
620 ucsi_altmode_update_active(con);
627 static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
629 switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
630 case UCSI_CONSTAT_PWR_OPMODE_PD:
631 con->rdo = con->status.request_data_obj;
632 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
633 ucsi_partner_task(con, ucsi_get_src_pdos, 30, 0);
634 ucsi_partner_task(con, ucsi_check_altmodes, 30, 0);
636 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
638 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
640 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
642 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
646 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
651 static int ucsi_register_partner(struct ucsi_connector *con)
653 u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags);
654 struct typec_partner_desc desc;
655 struct typec_partner *partner;
660 memset(&desc, 0, sizeof(desc));
662 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
663 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
664 desc.accessory = TYPEC_ACCESSORY_DEBUG;
666 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
667 desc.accessory = TYPEC_ACCESSORY_AUDIO;
673 desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
675 partner = typec_register_partner(con->port, &desc);
676 if (IS_ERR(partner)) {
677 dev_err(con->ucsi->dev,
678 "con%d: failed to register partner (%ld)\n", con->num,
680 return PTR_ERR(partner);
683 con->partner = partner;
688 static void ucsi_unregister_partner(struct ucsi_connector *con)
693 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
694 typec_unregister_partner(con->partner);
698 static void ucsi_partner_change(struct ucsi_connector *con)
700 enum usb_role u_role = USB_ROLE_NONE;
703 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
704 case UCSI_CONSTAT_PARTNER_TYPE_UFP:
705 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
706 u_role = USB_ROLE_HOST;
708 case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
709 typec_set_data_role(con->port, TYPEC_HOST);
711 case UCSI_CONSTAT_PARTNER_TYPE_DFP:
712 u_role = USB_ROLE_DEVICE;
713 typec_set_data_role(con->port, TYPEC_DEVICE);
719 /* Only notify USB controller if partner supports USB data */
720 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
721 u_role = USB_ROLE_NONE;
723 ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
725 dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n",
729 static int ucsi_check_connection(struct ucsi_connector *con)
734 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
735 ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status));
737 dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret);
741 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
742 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
743 UCSI_CONSTAT_PWR_OPMODE_PD)
744 ucsi_partner_task(con, ucsi_check_altmodes, 30, 0);
746 ucsi_partner_change(con);
747 ucsi_port_psy_changed(con);
748 ucsi_unregister_partner(con);
754 static void ucsi_handle_connector_change(struct work_struct *work)
756 struct ucsi_connector *con = container_of(work, struct ucsi_connector,
758 struct ucsi *ucsi = con->ucsi;
759 enum typec_role role;
763 mutex_lock(&con->lock);
765 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
766 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
768 dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
773 trace_ucsi_connector_change(con->num, &con->status);
775 role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
777 if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
778 typec_set_pwr_role(con->port, role);
780 /* Complete pending power role swap */
781 if (!completion_done(&con->complete))
782 complete(&con->complete);
785 if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
786 typec_set_pwr_role(con->port, role);
787 ucsi_port_psy_changed(con);
788 ucsi_partner_change(con);
790 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
791 ucsi_register_partner(con);
792 ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
794 ucsi_unregister_partner(con);
798 if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE ||
799 con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE)
800 ucsi_pwr_opmode_change(con);
802 if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) {
803 ucsi_partner_change(con);
805 /* Complete pending data role swap */
806 if (!completion_done(&con->complete))
807 complete(&con->complete);
810 if (con->status.change & UCSI_CONSTAT_CAM_CHANGE)
811 ucsi_partner_task(con, ucsi_check_altmodes, 1, 0);
813 clear_bit(EVENT_PENDING, &con->ucsi->flags);
815 ret = ucsi_acknowledge_connector_change(ucsi);
817 dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
820 mutex_unlock(&con->lock);
824 * ucsi_connector_change - Process Connector Change Event
825 * @ucsi: UCSI Interface
826 * @num: Connector number
828 void ucsi_connector_change(struct ucsi *ucsi, u8 num)
830 struct ucsi_connector *con = &ucsi->connector[num - 1];
832 if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) {
833 dev_dbg(ucsi->dev, "Bogus connector change event\n");
837 if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
838 schedule_work(&con->work);
840 EXPORT_SYMBOL_GPL(ucsi_connector_change);
842 /* -------------------------------------------------------------------------- */
844 static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
848 command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num);
849 command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0;
851 return ucsi_send_command(con->ucsi, command, NULL, 0);
854 static int ucsi_reset_ppm(struct ucsi *ucsi)
856 u64 command = UCSI_PPM_RESET;
861 mutex_lock(&ucsi->ppm_lock);
863 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command,
868 tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
871 if (time_is_before_jiffies(tmo)) {
876 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
880 /* If the PPM is still doing something else, reset it again. */
881 if (cci & ~UCSI_CCI_RESET_COMPLETE) {
882 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL,
890 } while (!(cci & UCSI_CCI_RESET_COMPLETE));
893 mutex_unlock(&ucsi->ppm_lock);
897 static int ucsi_role_cmd(struct ucsi_connector *con, u64 command)
901 ret = ucsi_send_command(con->ucsi, command, NULL, 0);
902 if (ret == -ETIMEDOUT) {
905 /* PPM most likely stopped responding. Resetting everything. */
906 ucsi_reset_ppm(con->ucsi);
908 c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy;
909 ucsi_send_command(con->ucsi, c, NULL, 0);
911 ucsi_reset_connector(con, true);
917 static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
919 struct ucsi_connector *con = typec_get_drvdata(port);
924 mutex_lock(&con->lock);
931 partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags);
932 if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
933 role == TYPEC_DEVICE) ||
934 (partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
938 command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num);
939 command |= UCSI_SET_UOR_ROLE(role);
940 command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS;
941 ret = ucsi_role_cmd(con, command);
945 if (!wait_for_completion_timeout(&con->complete,
946 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
950 mutex_unlock(&con->lock);
952 return ret < 0 ? ret : 0;
955 static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
957 struct ucsi_connector *con = typec_get_drvdata(port);
958 enum typec_role cur_role;
962 mutex_lock(&con->lock);
969 cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
971 if (cur_role == role)
974 command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num);
975 command |= UCSI_SET_PDR_ROLE(role);
976 command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS;
977 ret = ucsi_role_cmd(con, command);
981 if (!wait_for_completion_timeout(&con->complete,
982 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) {
987 /* Something has gone wrong while swapping the role */
988 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=
989 UCSI_CONSTAT_PWR_OPMODE_PD) {
990 ucsi_reset_connector(con, true);
995 mutex_unlock(&con->lock);
1000 static const struct typec_operations ucsi_ops = {
1001 .dr_set = ucsi_dr_swap,
1002 .pr_set = ucsi_pr_swap
1005 /* Caller must call fwnode_handle_put() after use */
1006 static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
1008 struct fwnode_handle *fwnode;
1011 device_for_each_child_node(con->ucsi->dev, fwnode)
1012 if (i++ == con->num)
1017 static int ucsi_register_port(struct ucsi *ucsi, int index)
1019 struct ucsi_connector *con = &ucsi->connector[index];
1020 struct typec_capability *cap = &con->typec_cap;
1021 enum typec_accessory *accessory = cap->accessory;
1022 enum usb_role u_role = USB_ROLE_NONE;
1027 name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num);
1031 con->wq = create_singlethread_workqueue(name);
1036 INIT_WORK(&con->work, ucsi_handle_connector_change);
1037 init_completion(&con->complete);
1038 mutex_init(&con->lock);
1039 con->num = index + 1;
1042 /* Delay other interactions with the con until registration is complete */
1043 mutex_lock(&con->lock);
1045 /* Get connector capability */
1046 command = UCSI_GET_CONNECTOR_CAPABILITY;
1047 command |= UCSI_CONNECTOR_NUMBER(con->num);
1048 ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap));
1052 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
1053 cap->data = TYPEC_PORT_DRD;
1054 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
1055 cap->data = TYPEC_PORT_DFP;
1056 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
1057 cap->data = TYPEC_PORT_UFP;
1059 if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) &&
1060 (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER))
1061 cap->type = TYPEC_PORT_DRP;
1062 else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER)
1063 cap->type = TYPEC_PORT_SRC;
1064 else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)
1065 cap->type = TYPEC_PORT_SNK;
1067 cap->revision = ucsi->cap.typec_version;
1068 cap->pd_revision = ucsi->cap.pd_version;
1069 cap->svdm_version = SVDM_VER_2_0;
1070 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
1072 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)
1073 *accessory++ = TYPEC_ACCESSORY_AUDIO;
1074 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY)
1075 *accessory = TYPEC_ACCESSORY_DEBUG;
1077 cap->fwnode = ucsi_find_fwnode(con);
1078 cap->driver_data = con;
1079 cap->ops = &ucsi_ops;
1081 ret = ucsi_register_port_psy(con);
1085 /* Register the connector */
1086 con->port = typec_register_port(ucsi->dev, cap);
1087 if (IS_ERR(con->port)) {
1088 ret = PTR_ERR(con->port);
1092 /* Alternate modes */
1093 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON);
1095 dev_err(ucsi->dev, "con%d: failed to register alt modes\n",
1100 /* Get the status */
1101 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
1102 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
1104 dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
1108 ret = 0; /* ucsi_send_command() returns length on success */
1110 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
1111 case UCSI_CONSTAT_PARTNER_TYPE_UFP:
1112 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
1113 u_role = USB_ROLE_HOST;
1115 case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
1116 typec_set_data_role(con->port, TYPEC_HOST);
1118 case UCSI_CONSTAT_PARTNER_TYPE_DFP:
1119 u_role = USB_ROLE_DEVICE;
1120 typec_set_data_role(con->port, TYPEC_DEVICE);
1126 /* Check if there is already something connected */
1127 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
1128 typec_set_pwr_role(con->port,
1129 !!(con->status.flags & UCSI_CONSTAT_PWR_DIR));
1130 ucsi_pwr_opmode_change(con);
1131 ucsi_register_partner(con);
1132 ucsi_port_psy_changed(con);
1135 con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode);
1136 if (IS_ERR(con->usb_role_sw)) {
1137 dev_err(ucsi->dev, "con%d: failed to get usb role switch\n",
1139 con->usb_role_sw = NULL;
1142 /* Only notify USB controller if partner supports USB data */
1143 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
1144 u_role = USB_ROLE_NONE;
1146 ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
1148 dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n",
1154 UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
1155 UCSI_CONSTAT_PWR_OPMODE_PD) {
1156 ucsi_get_src_pdos(con);
1157 ucsi_check_altmodes(con);
1160 trace_ucsi_register_port(con->num, &con->status);
1163 fwnode_handle_put(cap->fwnode);
1165 mutex_unlock(&con->lock);
1167 if (ret && con->wq) {
1168 destroy_workqueue(con->wq);
1176 * ucsi_init - Initialize UCSI interface
1177 * @ucsi: UCSI to be initialized
1179 * Registers all ports @ucsi has and enables all notification events.
1181 static int ucsi_init(struct ucsi *ucsi)
1183 struct ucsi_connector *con;
1189 ret = ucsi_reset_ppm(ucsi);
1191 dev_err(ucsi->dev, "failed to reset PPM!\n");
1195 /* Enable basic notifications */
1196 ucsi->ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
1197 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
1198 ret = ucsi_send_command(ucsi, command, NULL, 0);
1202 /* Get PPM capabilities */
1203 command = UCSI_GET_CAPABILITY;
1204 ret = ucsi_send_command(ucsi, command, &ucsi->cap, sizeof(ucsi->cap));
1208 if (!ucsi->cap.num_connectors) {
1213 /* Allocate the connectors. Released in ucsi_unregister() */
1214 ucsi->connector = kcalloc(ucsi->cap.num_connectors + 1,
1215 sizeof(*ucsi->connector), GFP_KERNEL);
1216 if (!ucsi->connector) {
1221 /* Register all connectors */
1222 for (i = 0; i < ucsi->cap.num_connectors; i++) {
1223 ret = ucsi_register_port(ucsi, i);
1225 goto err_unregister;
1228 /* Enable all notifications */
1229 ucsi->ntfy = UCSI_ENABLE_NTFY_ALL;
1230 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
1231 ret = ucsi_send_command(ucsi, command, NULL, 0);
1233 goto err_unregister;
1238 for (con = ucsi->connector; con->port; con++) {
1239 ucsi_unregister_partner(con);
1240 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON);
1241 ucsi_unregister_port_psy(con);
1243 destroy_workqueue(con->wq);
1244 typec_unregister_port(con->port);
1249 memset(&ucsi->cap, 0, sizeof(ucsi->cap));
1250 ucsi_reset_ppm(ucsi);
1255 static void ucsi_init_work(struct work_struct *work)
1257 struct ucsi *ucsi = container_of(work, struct ucsi, work);
1260 ret = ucsi_init(ucsi);
1262 dev_err(ucsi->dev, "PPM init failed (%d)\n", ret);
1266 * ucsi_get_drvdata - Return private driver data pointer
1267 * @ucsi: UCSI interface
1269 void *ucsi_get_drvdata(struct ucsi *ucsi)
1271 return ucsi->driver_data;
1273 EXPORT_SYMBOL_GPL(ucsi_get_drvdata);
1276 * ucsi_set_drvdata - Assign private driver data pointer
1277 * @ucsi: UCSI interface
1278 * @data: Private data pointer
1280 void ucsi_set_drvdata(struct ucsi *ucsi, void *data)
1282 ucsi->driver_data = data;
1284 EXPORT_SYMBOL_GPL(ucsi_set_drvdata);
1287 * ucsi_create - Allocate UCSI instance
1288 * @dev: Device interface to the PPM (Platform Policy Manager)
1289 * @ops: I/O routines
1291 struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops)
1295 if (!ops || !ops->read || !ops->sync_write || !ops->async_write)
1296 return ERR_PTR(-EINVAL);
1298 ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
1300 return ERR_PTR(-ENOMEM);
1302 INIT_WORK(&ucsi->work, ucsi_init_work);
1303 mutex_init(&ucsi->ppm_lock);
1309 EXPORT_SYMBOL_GPL(ucsi_create);
1312 * ucsi_destroy - Free UCSI instance
1313 * @ucsi: UCSI instance to be freed
1315 void ucsi_destroy(struct ucsi *ucsi)
1319 EXPORT_SYMBOL_GPL(ucsi_destroy);
1322 * ucsi_register - Register UCSI interface
1323 * @ucsi: UCSI instance
1325 int ucsi_register(struct ucsi *ucsi)
1329 ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version,
1330 sizeof(ucsi->version));
1337 queue_work(system_long_wq, &ucsi->work);
1341 EXPORT_SYMBOL_GPL(ucsi_register);
1344 * ucsi_unregister - Unregister UCSI interface
1345 * @ucsi: UCSI interface to be unregistered
1347 * Unregister UCSI interface that was created with ucsi_register().
1349 void ucsi_unregister(struct ucsi *ucsi)
1351 u64 cmd = UCSI_SET_NOTIFICATION_ENABLE;
1354 /* Make sure that we are not in the middle of driver initialization */
1355 cancel_work_sync(&ucsi->work);
1357 /* Disable notifications */
1358 ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
1360 for (i = 0; i < ucsi->cap.num_connectors; i++) {
1361 cancel_work_sync(&ucsi->connector[i].work);
1362 ucsi_unregister_partner(&ucsi->connector[i]);
1363 ucsi_unregister_altmodes(&ucsi->connector[i],
1364 UCSI_RECIPIENT_CON);
1365 ucsi_unregister_port_psy(&ucsi->connector[i]);
1366 if (ucsi->connector[i].wq)
1367 destroy_workqueue(ucsi->connector[i].wq);
1368 typec_unregister_port(ucsi->connector[i].port);
1371 kfree(ucsi->connector);
1373 EXPORT_SYMBOL_GPL(ucsi_unregister);
1375 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
1376 MODULE_LICENSE("GPL v2");
1377 MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver");