1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * USB Type-C Connector System Software Interface driver
4 *
5 * Copyright (C) 2017, Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 */
8
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>
16
17 #include "ucsi.h"
18 #include "trace.h"
19
20 /*
21 * UCSI_TIMEOUT_MS - PPM communication timeout
22 *
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.
27 */
28 #define UCSI_TIMEOUT_MS 5000
29
30 /*
31 * UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests
32 *
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.
36 */
37 #define UCSI_SWAP_TIMEOUT_MS 5000
38
ucsi_read_message_in(struct ucsi * ucsi,void * buf,size_t buf_size)39 static int ucsi_read_message_in(struct ucsi *ucsi, void *buf,
40 size_t buf_size)
41 {
42 /*
43 * Below UCSI 2.0, MESSAGE_IN was limited to 16 bytes. Truncate the
44 * reads here.
45 */
46 if (ucsi->version <= UCSI_VERSION_1_2)
47 buf_size = clamp(buf_size, 0, 16);
48
49 return ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, buf, buf_size);
50 }
51
ucsi_acknowledge_command(struct ucsi * ucsi)52 static int ucsi_acknowledge_command(struct ucsi *ucsi)
53 {
54 u64 ctrl;
55
56 ctrl = UCSI_ACK_CC_CI;
57 ctrl |= UCSI_ACK_COMMAND_COMPLETE;
58
59 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
60 }
61
ucsi_acknowledge_connector_change(struct ucsi * ucsi)62 static int ucsi_acknowledge_connector_change(struct ucsi *ucsi)
63 {
64 u64 ctrl;
65
66 ctrl = UCSI_ACK_CC_CI;
67 ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
68
69 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
70 }
71
72 static int ucsi_exec_command(struct ucsi *ucsi, u64 command);
73
ucsi_read_error(struct ucsi * ucsi)74 static int ucsi_read_error(struct ucsi *ucsi)
75 {
76 u16 error;
77 int ret;
78
79 /* Acknowledge the command that failed */
80 ret = ucsi_acknowledge_command(ucsi);
81 if (ret)
82 return ret;
83
84 ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS);
85 if (ret < 0)
86 return ret;
87
88 ret = ucsi_read_message_in(ucsi, &error, sizeof(error));
89 if (ret)
90 return ret;
91
92 ret = ucsi_acknowledge_command(ucsi);
93 if (ret)
94 return ret;
95
96 switch (error) {
97 case UCSI_ERROR_INCOMPATIBLE_PARTNER:
98 return -EOPNOTSUPP;
99 case UCSI_ERROR_CC_COMMUNICATION_ERR:
100 return -ECOMM;
101 case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
102 return -EPROTO;
103 case UCSI_ERROR_DEAD_BATTERY:
104 dev_warn(ucsi->dev, "Dead battery condition!\n");
105 return -EPERM;
106 case UCSI_ERROR_INVALID_CON_NUM:
107 case UCSI_ERROR_UNREGONIZED_CMD:
108 case UCSI_ERROR_INVALID_CMD_ARGUMENT:
109 dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error);
110 return -EINVAL;
111 case UCSI_ERROR_OVERCURRENT:
112 dev_warn(ucsi->dev, "Overcurrent condition\n");
113 break;
114 case UCSI_ERROR_PARTNER_REJECTED_SWAP:
115 dev_warn(ucsi->dev, "Partner rejected swap\n");
116 break;
117 case UCSI_ERROR_HARD_RESET:
118 dev_warn(ucsi->dev, "Hard reset occurred\n");
119 break;
120 case UCSI_ERROR_PPM_POLICY_CONFLICT:
121 dev_warn(ucsi->dev, "PPM Policy conflict\n");
122 break;
123 case UCSI_ERROR_SWAP_REJECTED:
124 dev_warn(ucsi->dev, "Swap rejected\n");
125 break;
126 case UCSI_ERROR_UNDEFINED:
127 default:
128 dev_err(ucsi->dev, "unknown error %u\n", error);
129 break;
130 }
131
132 return -EIO;
133 }
134
ucsi_exec_command(struct ucsi * ucsi,u64 cmd)135 static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
136 {
137 u32 cci;
138 int ret;
139
140 ret = ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
141 if (ret)
142 return ret;
143
144 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
145 if (ret)
146 return ret;
147
148 if (cmd != UCSI_CANCEL && cci & UCSI_CCI_BUSY)
149 return ucsi_exec_command(ucsi, UCSI_CANCEL);
150
151 if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
152 return -EIO;
153
154 if (cci & UCSI_CCI_NOT_SUPPORTED) {
155 if (ucsi_acknowledge_command(ucsi) < 0)
156 dev_err(ucsi->dev,
157 "ACK of unsupported command failed\n");
158 return -EOPNOTSUPP;
159 }
160
161 if (cci & UCSI_CCI_ERROR) {
162 if (cmd == UCSI_GET_ERROR_STATUS)
163 return -EIO;
164 return ucsi_read_error(ucsi);
165 }
166
167 if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) {
168 ret = ucsi_acknowledge_command(ucsi);
169 return ret ? ret : -EBUSY;
170 }
171
172 return UCSI_CCI_LENGTH(cci);
173 }
174
ucsi_send_command(struct ucsi * ucsi,u64 command,void * data,size_t size)175 int ucsi_send_command(struct ucsi *ucsi, u64 command,
176 void *data, size_t size)
177 {
178 u8 length;
179 int ret;
180
181 mutex_lock(&ucsi->ppm_lock);
182
183 ret = ucsi_exec_command(ucsi, command);
184 if (ret < 0)
185 goto out;
186
187 length = ret;
188
189 if (data) {
190 ret = ucsi_read_message_in(ucsi, data, size);
191 if (ret)
192 goto out;
193 }
194
195 ret = ucsi_acknowledge_command(ucsi);
196 if (ret)
197 goto out;
198
199 ret = length;
200 out:
201 mutex_unlock(&ucsi->ppm_lock);
202 return ret;
203 }
204 EXPORT_SYMBOL_GPL(ucsi_send_command);
205
206 /* -------------------------------------------------------------------------- */
207
208 struct ucsi_work {
209 struct delayed_work work;
210 struct list_head node;
211 unsigned long delay;
212 unsigned int count;
213 struct ucsi_connector *con;
214 int (*cb)(struct ucsi_connector *);
215 };
216
ucsi_poll_worker(struct work_struct * work)217 static void ucsi_poll_worker(struct work_struct *work)
218 {
219 struct ucsi_work *uwork = container_of(work, struct ucsi_work, work.work);
220 struct ucsi_connector *con = uwork->con;
221 int ret;
222
223 mutex_lock(&con->lock);
224
225 if (!con->partner) {
226 list_del(&uwork->node);
227 mutex_unlock(&con->lock);
228 kfree(uwork);
229 return;
230 }
231
232 ret = uwork->cb(con);
233
234 if (uwork->count-- && (ret == -EBUSY || ret == -ETIMEDOUT)) {
235 queue_delayed_work(con->wq, &uwork->work, uwork->delay);
236 } else {
237 list_del(&uwork->node);
238 kfree(uwork);
239 }
240
241 mutex_unlock(&con->lock);
242 }
243
ucsi_partner_task(struct ucsi_connector * con,int (* cb)(struct ucsi_connector *),int retries,unsigned long delay)244 static int ucsi_partner_task(struct ucsi_connector *con,
245 int (*cb)(struct ucsi_connector *),
246 int retries, unsigned long delay)
247 {
248 struct ucsi_work *uwork;
249
250 if (!con->partner)
251 return 0;
252
253 uwork = kzalloc(sizeof(*uwork), GFP_KERNEL);
254 if (!uwork)
255 return -ENOMEM;
256
257 INIT_DELAYED_WORK(&uwork->work, ucsi_poll_worker);
258 uwork->count = retries;
259 uwork->delay = delay;
260 uwork->con = con;
261 uwork->cb = cb;
262
263 list_add_tail(&uwork->node, &con->partner_tasks);
264 queue_delayed_work(con->wq, &uwork->work, delay);
265
266 return 0;
267 }
268
269 /* -------------------------------------------------------------------------- */
270
ucsi_altmode_update_active(struct ucsi_connector * con)271 void ucsi_altmode_update_active(struct ucsi_connector *con)
272 {
273 const struct typec_altmode *altmode = NULL;
274 u64 command;
275 int ret;
276 u8 cur;
277 int i;
278
279 command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num);
280 ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur));
281 if (ret < 0) {
282 if (con->ucsi->version > 0x0100) {
283 dev_err(con->ucsi->dev,
284 "GET_CURRENT_CAM command failed\n");
285 return;
286 }
287 cur = 0xff;
288 }
289
290 if (cur < UCSI_MAX_ALTMODES)
291 altmode = typec_altmode_get_partner(con->port_altmode[cur]);
292
293 for (i = 0; con->partner_altmode[i]; i++)
294 typec_altmode_update_active(con->partner_altmode[i],
295 con->partner_altmode[i] == altmode);
296 }
297
ucsi_altmode_next_mode(struct typec_altmode ** alt,u16 svid)298 static int ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid)
299 {
300 u8 mode = 1;
301 int i;
302
303 for (i = 0; alt[i]; i++) {
304 if (i > MODE_DISCOVERY_MAX)
305 return -ERANGE;
306
307 if (alt[i]->svid == svid)
308 mode++;
309 }
310
311 return mode;
312 }
313
ucsi_next_altmode(struct typec_altmode ** alt)314 static int ucsi_next_altmode(struct typec_altmode **alt)
315 {
316 int i = 0;
317
318 for (i = 0; i < UCSI_MAX_ALTMODES; i++)
319 if (!alt[i])
320 return i;
321
322 return -ENOENT;
323 }
324
ucsi_get_num_altmode(struct typec_altmode ** alt)325 static int ucsi_get_num_altmode(struct typec_altmode **alt)
326 {
327 int i;
328
329 for (i = 0; i < UCSI_MAX_ALTMODES; i++)
330 if (!alt[i])
331 break;
332
333 return i;
334 }
335
ucsi_register_altmode(struct ucsi_connector * con,struct typec_altmode_desc * desc,u8 recipient)336 static int ucsi_register_altmode(struct ucsi_connector *con,
337 struct typec_altmode_desc *desc,
338 u8 recipient)
339 {
340 struct typec_altmode *alt;
341 bool override;
342 int ret;
343 int i;
344
345 override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE);
346
347 switch (recipient) {
348 case UCSI_RECIPIENT_CON:
349 i = ucsi_next_altmode(con->port_altmode);
350 if (i < 0) {
351 ret = i;
352 goto err;
353 }
354
355 ret = ucsi_altmode_next_mode(con->port_altmode, desc->svid);
356 if (ret < 0)
357 return ret;
358
359 desc->mode = ret;
360
361 switch (desc->svid) {
362 case USB_TYPEC_DP_SID:
363 alt = ucsi_register_displayport(con, override, i, desc);
364 break;
365 case USB_TYPEC_NVIDIA_VLINK_SID:
366 if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO)
367 alt = typec_port_register_altmode(con->port,
368 desc);
369 else
370 alt = ucsi_register_displayport(con, override,
371 i, desc);
372 break;
373 default:
374 alt = typec_port_register_altmode(con->port, desc);
375 break;
376 }
377
378 if (IS_ERR(alt)) {
379 ret = PTR_ERR(alt);
380 goto err;
381 }
382
383 con->port_altmode[i] = alt;
384 break;
385 case UCSI_RECIPIENT_SOP:
386 i = ucsi_next_altmode(con->partner_altmode);
387 if (i < 0) {
388 ret = i;
389 goto err;
390 }
391
392 ret = ucsi_altmode_next_mode(con->partner_altmode, desc->svid);
393 if (ret < 0)
394 return ret;
395
396 desc->mode = ret;
397
398 alt = typec_partner_register_altmode(con->partner, desc);
399 if (IS_ERR(alt)) {
400 ret = PTR_ERR(alt);
401 goto err;
402 }
403
404 con->partner_altmode[i] = alt;
405 break;
406 default:
407 return -EINVAL;
408 }
409
410 trace_ucsi_register_altmode(recipient, alt);
411
412 return 0;
413
414 err:
415 dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n",
416 desc->svid, desc->mode);
417
418 return ret;
419 }
420
421 static int
ucsi_register_altmodes_nvidia(struct ucsi_connector * con,u8 recipient)422 ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient)
423 {
424 int max_altmodes = UCSI_MAX_ALTMODES;
425 struct typec_altmode_desc desc;
426 struct ucsi_altmode alt;
427 struct ucsi_altmode orig[UCSI_MAX_ALTMODES];
428 struct ucsi_altmode updated[UCSI_MAX_ALTMODES];
429 struct ucsi *ucsi = con->ucsi;
430 bool multi_dp = false;
431 u64 command;
432 int ret;
433 int len;
434 int i;
435 int k = 0;
436
437 if (recipient == UCSI_RECIPIENT_CON)
438 max_altmodes = con->ucsi->cap.num_alt_modes;
439
440 memset(orig, 0, sizeof(orig));
441 memset(updated, 0, sizeof(updated));
442
443 /* First get all the alternate modes */
444 for (i = 0; i < max_altmodes; i++) {
445 memset(&alt, 0, sizeof(alt));
446 command = UCSI_GET_ALTERNATE_MODES;
447 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
448 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
449 command |= UCSI_GET_ALTMODE_OFFSET(i);
450 len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt));
451 /*
452 * We are collecting all altmodes first and then registering.
453 * Some type-C device will return zero length data beyond last
454 * alternate modes. We should not return if length is zero.
455 */
456 if (len < 0)
457 return len;
458
459 /* We got all altmodes, now break out and register them */
460 if (!len || !alt.svid)
461 break;
462
463 orig[k].mid = alt.mid;
464 orig[k].svid = alt.svid;
465 k++;
466 }
467 /*
468 * Update the original altmode table as some ppms may report
469 * multiple DP altmodes.
470 */
471 if (recipient == UCSI_RECIPIENT_CON)
472 multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated);
473
474 /* now register altmodes */
475 for (i = 0; i < max_altmodes; i++) {
476 memset(&desc, 0, sizeof(desc));
477 if (multi_dp && recipient == UCSI_RECIPIENT_CON) {
478 desc.svid = updated[i].svid;
479 desc.vdo = updated[i].mid;
480 } else {
481 desc.svid = orig[i].svid;
482 desc.vdo = orig[i].mid;
483 }
484 desc.roles = TYPEC_PORT_DRD;
485
486 if (!desc.svid)
487 return 0;
488
489 ret = ucsi_register_altmode(con, &desc, recipient);
490 if (ret)
491 return ret;
492 }
493
494 return 0;
495 }
496
ucsi_register_altmodes(struct ucsi_connector * con,u8 recipient)497 static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient)
498 {
499 int max_altmodes = UCSI_MAX_ALTMODES;
500 struct typec_altmode_desc desc;
501 struct ucsi_altmode alt[2];
502 u64 command;
503 int num;
504 int ret;
505 int len;
506 int j;
507 int i;
508
509 if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS))
510 return 0;
511
512 if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0])
513 return 0;
514
515 if (con->ucsi->ops->update_altmodes)
516 return ucsi_register_altmodes_nvidia(con, recipient);
517
518 if (recipient == UCSI_RECIPIENT_CON)
519 max_altmodes = con->ucsi->cap.num_alt_modes;
520
521 for (i = 0; i < max_altmodes;) {
522 memset(alt, 0, sizeof(alt));
523 command = UCSI_GET_ALTERNATE_MODES;
524 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
525 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
526 command |= UCSI_GET_ALTMODE_OFFSET(i);
527 len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt));
528 if (len == -EBUSY)
529 continue;
530 if (len <= 0)
531 return len;
532
533 /*
534 * This code is requesting one alt mode at a time, but some PPMs
535 * may still return two. If that happens both alt modes need be
536 * registered and the offset for the next alt mode has to be
537 * incremented.
538 */
539 num = len / sizeof(alt[0]);
540 i += num;
541
542 for (j = 0; j < num; j++) {
543 if (!alt[j].svid)
544 return 0;
545
546 memset(&desc, 0, sizeof(desc));
547 desc.vdo = alt[j].mid;
548 desc.svid = alt[j].svid;
549 desc.roles = TYPEC_PORT_DRD;
550
551 ret = ucsi_register_altmode(con, &desc, recipient);
552 if (ret)
553 return ret;
554 }
555 }
556
557 return 0;
558 }
559
ucsi_unregister_altmodes(struct ucsi_connector * con,u8 recipient)560 static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient)
561 {
562 const struct typec_altmode *pdev;
563 struct typec_altmode **adev;
564 int i = 0;
565
566 switch (recipient) {
567 case UCSI_RECIPIENT_CON:
568 adev = con->port_altmode;
569 break;
570 case UCSI_RECIPIENT_SOP:
571 adev = con->partner_altmode;
572 break;
573 default:
574 return;
575 }
576
577 while (adev[i]) {
578 if (recipient == UCSI_RECIPIENT_SOP &&
579 (adev[i]->svid == USB_TYPEC_DP_SID ||
580 (adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID &&
581 adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) {
582 pdev = typec_altmode_get_partner(adev[i]);
583 ucsi_displayport_remove_partner((void *)pdev);
584 }
585 typec_unregister_altmode(adev[i]);
586 adev[i++] = NULL;
587 }
588 }
589
ucsi_read_pdos(struct ucsi_connector * con,enum typec_role role,int is_partner,u32 * pdos,int offset,int num_pdos)590 static int ucsi_read_pdos(struct ucsi_connector *con,
591 enum typec_role role, int is_partner,
592 u32 *pdos, int offset, int num_pdos)
593 {
594 struct ucsi *ucsi = con->ucsi;
595 u64 command;
596 int ret;
597
598 command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num);
599 command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner);
600 command |= UCSI_GET_PDOS_PDO_OFFSET(offset);
601 command |= UCSI_GET_PDOS_NUM_PDOS(num_pdos - 1);
602 command |= is_source(role) ? UCSI_GET_PDOS_SRC_PDOS : 0;
603 ret = ucsi_send_command(ucsi, command, pdos + offset,
604 num_pdos * sizeof(u32));
605 if (ret < 0 && ret != -ETIMEDOUT)
606 dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
607
608 return ret;
609 }
610
ucsi_get_pdos(struct ucsi_connector * con,enum typec_role role,int is_partner,u32 * pdos)611 static int ucsi_get_pdos(struct ucsi_connector *con, enum typec_role role,
612 int is_partner, u32 *pdos)
613 {
614 u8 num_pdos;
615 int ret;
616
617 /* UCSI max payload means only getting at most 4 PDOs at a time */
618 ret = ucsi_read_pdos(con, role, is_partner, pdos, 0, UCSI_MAX_PDOS);
619 if (ret < 0)
620 return ret;
621
622 num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */
623 if (num_pdos < UCSI_MAX_PDOS)
624 return num_pdos;
625
626 /* get the remaining PDOs, if any */
627 ret = ucsi_read_pdos(con, role, is_partner, pdos, UCSI_MAX_PDOS,
628 PDO_MAX_OBJECTS - UCSI_MAX_PDOS);
629 if (ret < 0)
630 return ret;
631
632 return ret / sizeof(u32) + num_pdos;
633 }
634
ucsi_get_src_pdos(struct ucsi_connector * con)635 static int ucsi_get_src_pdos(struct ucsi_connector *con)
636 {
637 int ret;
638
639 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 1, con->src_pdos);
640 if (ret < 0)
641 return ret;
642
643 con->num_pdos = ret;
644
645 ucsi_port_psy_changed(con);
646
647 return ret;
648 }
649
ucsi_check_altmodes(struct ucsi_connector * con)650 static int ucsi_check_altmodes(struct ucsi_connector *con)
651 {
652 int ret, num_partner_am;
653
654 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
655 if (ret && ret != -ETIMEDOUT)
656 dev_err(con->ucsi->dev,
657 "con%d: failed to register partner alt modes (%d)\n",
658 con->num, ret);
659
660 /* Ignoring the errors in this case. */
661 if (con->partner_altmode[0]) {
662 num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
663 if (num_partner_am > 0)
664 typec_partner_set_num_altmodes(con->partner, num_partner_am);
665 ucsi_altmode_update_active(con);
666 return 0;
667 }
668
669 return ret;
670 }
671
ucsi_register_partner_pdos(struct ucsi_connector * con)672 static int ucsi_register_partner_pdos(struct ucsi_connector *con)
673 {
674 struct usb_power_delivery_desc desc = { con->ucsi->cap.pd_version };
675 struct usb_power_delivery_capabilities_desc caps;
676 struct usb_power_delivery_capabilities *cap;
677 int ret;
678
679 if (con->partner_pd)
680 return 0;
681
682 con->partner_pd = usb_power_delivery_register(NULL, &desc);
683 if (IS_ERR(con->partner_pd))
684 return PTR_ERR(con->partner_pd);
685
686 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 1, caps.pdo);
687 if (ret > 0) {
688 if (ret < PDO_MAX_OBJECTS)
689 caps.pdo[ret] = 0;
690
691 caps.role = TYPEC_SOURCE;
692 cap = usb_power_delivery_register_capabilities(con->partner_pd, &caps);
693 if (IS_ERR(cap))
694 return PTR_ERR(cap);
695
696 con->partner_source_caps = cap;
697
698 ret = typec_partner_set_usb_power_delivery(con->partner, con->partner_pd);
699 if (ret) {
700 usb_power_delivery_unregister_capabilities(con->partner_source_caps);
701 return ret;
702 }
703 }
704
705 ret = ucsi_get_pdos(con, TYPEC_SINK, 1, caps.pdo);
706 if (ret > 0) {
707 if (ret < PDO_MAX_OBJECTS)
708 caps.pdo[ret] = 0;
709
710 caps.role = TYPEC_SINK;
711
712 cap = usb_power_delivery_register_capabilities(con->partner_pd, &caps);
713 if (IS_ERR(cap))
714 return PTR_ERR(cap);
715
716 con->partner_sink_caps = cap;
717
718 ret = typec_partner_set_usb_power_delivery(con->partner, con->partner_pd);
719 if (ret) {
720 usb_power_delivery_unregister_capabilities(con->partner_sink_caps);
721 return ret;
722 }
723 }
724
725 return 0;
726 }
727
ucsi_unregister_partner_pdos(struct ucsi_connector * con)728 static void ucsi_unregister_partner_pdos(struct ucsi_connector *con)
729 {
730 usb_power_delivery_unregister_capabilities(con->partner_sink_caps);
731 con->partner_sink_caps = NULL;
732 usb_power_delivery_unregister_capabilities(con->partner_source_caps);
733 con->partner_source_caps = NULL;
734 usb_power_delivery_unregister(con->partner_pd);
735 con->partner_pd = NULL;
736 }
737
ucsi_pwr_opmode_change(struct ucsi_connector * con)738 static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
739 {
740 switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
741 case UCSI_CONSTAT_PWR_OPMODE_PD:
742 con->rdo = con->status.request_data_obj;
743 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
744 ucsi_partner_task(con, ucsi_get_src_pdos, 30, 0);
745 ucsi_partner_task(con, ucsi_check_altmodes, 30, 0);
746 ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ);
747 break;
748 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
749 con->rdo = 0;
750 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
751 break;
752 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
753 con->rdo = 0;
754 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
755 break;
756 default:
757 con->rdo = 0;
758 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
759 break;
760 }
761 }
762
ucsi_register_partner(struct ucsi_connector * con)763 static int ucsi_register_partner(struct ucsi_connector *con)
764 {
765 u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags);
766 struct typec_partner_desc desc;
767 struct typec_partner *partner;
768
769 if (con->partner)
770 return 0;
771
772 memset(&desc, 0, sizeof(desc));
773
774 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
775 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
776 desc.accessory = TYPEC_ACCESSORY_DEBUG;
777 break;
778 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
779 desc.accessory = TYPEC_ACCESSORY_AUDIO;
780 break;
781 default:
782 break;
783 }
784
785 desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
786
787 partner = typec_register_partner(con->port, &desc);
788 if (IS_ERR(partner)) {
789 dev_err(con->ucsi->dev,
790 "con%d: failed to register partner (%ld)\n", con->num,
791 PTR_ERR(partner));
792 return PTR_ERR(partner);
793 }
794
795 con->partner = partner;
796
797 return 0;
798 }
799
ucsi_unregister_partner(struct ucsi_connector * con)800 static void ucsi_unregister_partner(struct ucsi_connector *con)
801 {
802 if (!con->partner)
803 return;
804
805 typec_set_mode(con->port, TYPEC_STATE_SAFE);
806
807 typec_partner_set_usb_power_delivery(con->partner, NULL);
808 ucsi_unregister_partner_pdos(con);
809 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
810 typec_unregister_partner(con->partner);
811 con->partner = NULL;
812 }
813
ucsi_partner_change(struct ucsi_connector * con)814 static void ucsi_partner_change(struct ucsi_connector *con)
815 {
816 enum usb_role u_role = USB_ROLE_NONE;
817 int ret;
818
819 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
820 case UCSI_CONSTAT_PARTNER_TYPE_UFP:
821 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
822 u_role = USB_ROLE_HOST;
823 fallthrough;
824 case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
825 typec_set_data_role(con->port, TYPEC_HOST);
826 break;
827 case UCSI_CONSTAT_PARTNER_TYPE_DFP:
828 u_role = USB_ROLE_DEVICE;
829 typec_set_data_role(con->port, TYPEC_DEVICE);
830 break;
831 default:
832 break;
833 }
834
835 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
836 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
837 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
838 typec_set_mode(con->port, TYPEC_MODE_DEBUG);
839 break;
840 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
841 typec_set_mode(con->port, TYPEC_MODE_AUDIO);
842 break;
843 default:
844 if (UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) ==
845 UCSI_CONSTAT_PARTNER_FLAG_USB)
846 typec_set_mode(con->port, TYPEC_STATE_USB);
847 }
848 }
849
850 /* Only notify USB controller if partner supports USB data */
851 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
852 u_role = USB_ROLE_NONE;
853
854 ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
855 if (ret)
856 dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n",
857 con->num, u_role);
858 }
859
ucsi_check_connection(struct ucsi_connector * con)860 static int ucsi_check_connection(struct ucsi_connector *con)
861 {
862 u8 prev_flags = con->status.flags;
863 u64 command;
864 int ret;
865
866 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
867 ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status));
868 if (ret < 0) {
869 dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret);
870 return ret;
871 }
872
873 if (con->status.flags == prev_flags)
874 return 0;
875
876 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
877 ucsi_register_partner(con);
878 ucsi_pwr_opmode_change(con);
879 ucsi_partner_change(con);
880 } else {
881 ucsi_partner_change(con);
882 ucsi_port_psy_changed(con);
883 ucsi_unregister_partner(con);
884 }
885
886 return 0;
887 }
888
ucsi_handle_connector_change(struct work_struct * work)889 static void ucsi_handle_connector_change(struct work_struct *work)
890 {
891 struct ucsi_connector *con = container_of(work, struct ucsi_connector,
892 work);
893 struct ucsi *ucsi = con->ucsi;
894 enum typec_role role;
895 u64 command;
896 int ret;
897
898 mutex_lock(&con->lock);
899
900 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
901 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
902 if (ret < 0) {
903 dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
904 __func__, ret);
905 clear_bit(EVENT_PENDING, &con->ucsi->flags);
906 goto out_unlock;
907 }
908
909 trace_ucsi_connector_change(con->num, &con->status);
910
911 role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
912
913 if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
914 typec_set_pwr_role(con->port, role);
915
916 /* Complete pending power role swap */
917 if (!completion_done(&con->complete))
918 complete(&con->complete);
919 }
920
921 if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
922 typec_set_pwr_role(con->port, role);
923 ucsi_port_psy_changed(con);
924 ucsi_partner_change(con);
925
926 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
927 ucsi_register_partner(con);
928 ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
929
930 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
931 UCSI_CONSTAT_PWR_OPMODE_PD)
932 ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ);
933 } else {
934 ucsi_unregister_partner(con);
935 }
936 }
937
938 if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE ||
939 con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE)
940 ucsi_pwr_opmode_change(con);
941
942 if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) {
943 ucsi_partner_change(con);
944
945 /* Complete pending data role swap */
946 if (!completion_done(&con->complete))
947 complete(&con->complete);
948 }
949
950 if (con->status.change & UCSI_CONSTAT_CAM_CHANGE)
951 ucsi_partner_task(con, ucsi_check_altmodes, 1, 0);
952
953 mutex_lock(&ucsi->ppm_lock);
954 clear_bit(EVENT_PENDING, &con->ucsi->flags);
955 ret = ucsi_acknowledge_connector_change(ucsi);
956 mutex_unlock(&ucsi->ppm_lock);
957
958 if (ret)
959 dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
960
961 out_unlock:
962 mutex_unlock(&con->lock);
963 }
964
965 /**
966 * ucsi_connector_change - Process Connector Change Event
967 * @ucsi: UCSI Interface
968 * @num: Connector number
969 */
ucsi_connector_change(struct ucsi * ucsi,u8 num)970 void ucsi_connector_change(struct ucsi *ucsi, u8 num)
971 {
972 struct ucsi_connector *con = &ucsi->connector[num - 1];
973
974 if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) {
975 dev_dbg(ucsi->dev, "Early connector change event\n");
976 return;
977 }
978
979 if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
980 schedule_work(&con->work);
981 }
982 EXPORT_SYMBOL_GPL(ucsi_connector_change);
983
984 /* -------------------------------------------------------------------------- */
985
ucsi_reset_connector(struct ucsi_connector * con,bool hard)986 static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
987 {
988 u64 command;
989
990 command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num);
991 command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0;
992
993 return ucsi_send_command(con->ucsi, command, NULL, 0);
994 }
995
ucsi_reset_ppm(struct ucsi * ucsi)996 static int ucsi_reset_ppm(struct ucsi *ucsi)
997 {
998 u64 command;
999 unsigned long tmo;
1000 u32 cci;
1001 int ret;
1002
1003 mutex_lock(&ucsi->ppm_lock);
1004
1005 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
1006 if (ret < 0)
1007 goto out;
1008
1009 /*
1010 * If UCSI_CCI_RESET_COMPLETE is already set we must clear
1011 * the flag before we start another reset. Send a
1012 * UCSI_SET_NOTIFICATION_ENABLE command to achieve this.
1013 * Ignore a timeout and try the reset anyway if this fails.
1014 */
1015 if (cci & UCSI_CCI_RESET_COMPLETE) {
1016 command = UCSI_SET_NOTIFICATION_ENABLE;
1017 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command,
1018 sizeof(command));
1019 if (ret < 0)
1020 goto out;
1021
1022 tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
1023 do {
1024 ret = ucsi->ops->read(ucsi, UCSI_CCI,
1025 &cci, sizeof(cci));
1026 if (ret < 0)
1027 goto out;
1028 if (cci & UCSI_CCI_COMMAND_COMPLETE)
1029 break;
1030 if (time_is_before_jiffies(tmo))
1031 break;
1032 msleep(20);
1033 } while (1);
1034
1035 WARN_ON(cci & UCSI_CCI_RESET_COMPLETE);
1036 }
1037
1038 command = UCSI_PPM_RESET;
1039 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command,
1040 sizeof(command));
1041 if (ret < 0)
1042 goto out;
1043
1044 tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
1045
1046 do {
1047 if (time_is_before_jiffies(tmo)) {
1048 ret = -ETIMEDOUT;
1049 goto out;
1050 }
1051
1052 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
1053 if (ret)
1054 goto out;
1055
1056 /* If the PPM is still doing something else, reset it again. */
1057 if (cci & ~UCSI_CCI_RESET_COMPLETE) {
1058 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL,
1059 &command,
1060 sizeof(command));
1061 if (ret < 0)
1062 goto out;
1063 }
1064
1065 msleep(20);
1066 } while (!(cci & UCSI_CCI_RESET_COMPLETE));
1067
1068 out:
1069 mutex_unlock(&ucsi->ppm_lock);
1070 return ret;
1071 }
1072
ucsi_role_cmd(struct ucsi_connector * con,u64 command)1073 static int ucsi_role_cmd(struct ucsi_connector *con, u64 command)
1074 {
1075 int ret;
1076
1077 ret = ucsi_send_command(con->ucsi, command, NULL, 0);
1078 if (ret == -ETIMEDOUT) {
1079 u64 c;
1080
1081 /* PPM most likely stopped responding. Resetting everything. */
1082 ucsi_reset_ppm(con->ucsi);
1083
1084 c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy;
1085 ucsi_send_command(con->ucsi, c, NULL, 0);
1086
1087 ucsi_reset_connector(con, true);
1088 }
1089
1090 return ret;
1091 }
1092
ucsi_dr_swap(struct typec_port * port,enum typec_data_role role)1093 static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
1094 {
1095 struct ucsi_connector *con = typec_get_drvdata(port);
1096 u8 partner_type;
1097 u64 command;
1098 int ret = 0;
1099
1100 mutex_lock(&con->lock);
1101
1102 if (!con->partner) {
1103 ret = -ENOTCONN;
1104 goto out_unlock;
1105 }
1106
1107 partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags);
1108 if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
1109 role == TYPEC_DEVICE) ||
1110 (partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
1111 role == TYPEC_HOST))
1112 goto out_unlock;
1113
1114 reinit_completion(&con->complete);
1115
1116 command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num);
1117 command |= UCSI_SET_UOR_ROLE(role);
1118 command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS;
1119 ret = ucsi_role_cmd(con, command);
1120 if (ret < 0)
1121 goto out_unlock;
1122
1123 mutex_unlock(&con->lock);
1124
1125 if (!wait_for_completion_timeout(&con->complete,
1126 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
1127 return -ETIMEDOUT;
1128
1129 return 0;
1130
1131 out_unlock:
1132 mutex_unlock(&con->lock);
1133
1134 return ret;
1135 }
1136
ucsi_pr_swap(struct typec_port * port,enum typec_role role)1137 static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
1138 {
1139 struct ucsi_connector *con = typec_get_drvdata(port);
1140 enum typec_role cur_role;
1141 u64 command;
1142 int ret = 0;
1143
1144 mutex_lock(&con->lock);
1145
1146 if (!con->partner) {
1147 ret = -ENOTCONN;
1148 goto out_unlock;
1149 }
1150
1151 cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
1152
1153 if (cur_role == role)
1154 goto out_unlock;
1155
1156 reinit_completion(&con->complete);
1157
1158 command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num);
1159 command |= UCSI_SET_PDR_ROLE(role);
1160 command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS;
1161 ret = ucsi_role_cmd(con, command);
1162 if (ret < 0)
1163 goto out_unlock;
1164
1165 mutex_unlock(&con->lock);
1166
1167 if (!wait_for_completion_timeout(&con->complete,
1168 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
1169 return -ETIMEDOUT;
1170
1171 mutex_lock(&con->lock);
1172
1173 /* Something has gone wrong while swapping the role */
1174 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=
1175 UCSI_CONSTAT_PWR_OPMODE_PD) {
1176 ucsi_reset_connector(con, true);
1177 ret = -EPROTO;
1178 }
1179
1180 out_unlock:
1181 mutex_unlock(&con->lock);
1182
1183 return ret;
1184 }
1185
1186 static const struct typec_operations ucsi_ops = {
1187 .dr_set = ucsi_dr_swap,
1188 .pr_set = ucsi_pr_swap
1189 };
1190
1191 /* Caller must call fwnode_handle_put() after use */
ucsi_find_fwnode(struct ucsi_connector * con)1192 static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
1193 {
1194 struct fwnode_handle *fwnode;
1195 int i = 1;
1196
1197 device_for_each_child_node(con->ucsi->dev, fwnode)
1198 if (i++ == con->num)
1199 return fwnode;
1200 return NULL;
1201 }
1202
ucsi_register_port(struct ucsi * ucsi,struct ucsi_connector * con)1203 static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
1204 {
1205 struct usb_power_delivery_desc desc = { ucsi->cap.pd_version};
1206 struct usb_power_delivery_capabilities_desc pd_caps;
1207 struct usb_power_delivery_capabilities *pd_cap;
1208 struct typec_capability *cap = &con->typec_cap;
1209 enum typec_accessory *accessory = cap->accessory;
1210 enum usb_role u_role = USB_ROLE_NONE;
1211 u64 command;
1212 char *name;
1213 int ret;
1214
1215 name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num);
1216 if (!name)
1217 return -ENOMEM;
1218
1219 con->wq = create_singlethread_workqueue(name);
1220 kfree(name);
1221 if (!con->wq)
1222 return -ENOMEM;
1223
1224 INIT_WORK(&con->work, ucsi_handle_connector_change);
1225 init_completion(&con->complete);
1226 mutex_init(&con->lock);
1227 INIT_LIST_HEAD(&con->partner_tasks);
1228 con->ucsi = ucsi;
1229
1230 cap->fwnode = ucsi_find_fwnode(con);
1231 con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode);
1232 if (IS_ERR(con->usb_role_sw))
1233 return dev_err_probe(ucsi->dev, PTR_ERR(con->usb_role_sw),
1234 "con%d: failed to get usb role switch\n", con->num);
1235
1236 /* Delay other interactions with the con until registration is complete */
1237 mutex_lock(&con->lock);
1238
1239 /* Get connector capability */
1240 command = UCSI_GET_CONNECTOR_CAPABILITY;
1241 command |= UCSI_CONNECTOR_NUMBER(con->num);
1242 ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap));
1243 if (ret < 0)
1244 goto out_unlock;
1245
1246 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
1247 cap->data = TYPEC_PORT_DRD;
1248 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
1249 cap->data = TYPEC_PORT_DFP;
1250 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
1251 cap->data = TYPEC_PORT_UFP;
1252
1253 if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) &&
1254 (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER))
1255 cap->type = TYPEC_PORT_DRP;
1256 else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER)
1257 cap->type = TYPEC_PORT_SRC;
1258 else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)
1259 cap->type = TYPEC_PORT_SNK;
1260
1261 cap->revision = ucsi->cap.typec_version;
1262 cap->pd_revision = ucsi->cap.pd_version;
1263 cap->svdm_version = SVDM_VER_2_0;
1264 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
1265
1266 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)
1267 *accessory++ = TYPEC_ACCESSORY_AUDIO;
1268 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY)
1269 *accessory = TYPEC_ACCESSORY_DEBUG;
1270
1271 cap->driver_data = con;
1272 cap->ops = &ucsi_ops;
1273
1274 ret = ucsi_register_port_psy(con);
1275 if (ret)
1276 goto out;
1277
1278 /* Register the connector */
1279 con->port = typec_register_port(ucsi->dev, cap);
1280 if (IS_ERR(con->port)) {
1281 ret = PTR_ERR(con->port);
1282 goto out;
1283 }
1284
1285 con->pd = usb_power_delivery_register(ucsi->dev, &desc);
1286
1287 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 0, pd_caps.pdo);
1288 if (ret > 0) {
1289 if (ret < PDO_MAX_OBJECTS)
1290 pd_caps.pdo[ret] = 0;
1291
1292 pd_caps.role = TYPEC_SOURCE;
1293 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps);
1294 if (IS_ERR(pd_cap)) {
1295 ret = PTR_ERR(pd_cap);
1296 goto out;
1297 }
1298
1299 con->port_source_caps = pd_cap;
1300 typec_port_set_usb_power_delivery(con->port, con->pd);
1301 }
1302
1303 memset(&pd_caps, 0, sizeof(pd_caps));
1304 ret = ucsi_get_pdos(con, TYPEC_SINK, 0, pd_caps.pdo);
1305 if (ret > 0) {
1306 if (ret < PDO_MAX_OBJECTS)
1307 pd_caps.pdo[ret] = 0;
1308
1309 pd_caps.role = TYPEC_SINK;
1310 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps);
1311 if (IS_ERR(pd_cap)) {
1312 ret = PTR_ERR(pd_cap);
1313 goto out;
1314 }
1315
1316 con->port_sink_caps = pd_cap;
1317 typec_port_set_usb_power_delivery(con->port, con->pd);
1318 }
1319
1320 /* Alternate modes */
1321 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON);
1322 if (ret) {
1323 dev_err(ucsi->dev, "con%d: failed to register alt modes\n",
1324 con->num);
1325 goto out;
1326 }
1327
1328 /* Get the status */
1329 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
1330 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
1331 if (ret < 0) {
1332 dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
1333 ret = 0;
1334 goto out;
1335 }
1336 ret = 0; /* ucsi_send_command() returns length on success */
1337
1338 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
1339 case UCSI_CONSTAT_PARTNER_TYPE_UFP:
1340 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
1341 u_role = USB_ROLE_HOST;
1342 fallthrough;
1343 case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
1344 typec_set_data_role(con->port, TYPEC_HOST);
1345 break;
1346 case UCSI_CONSTAT_PARTNER_TYPE_DFP:
1347 u_role = USB_ROLE_DEVICE;
1348 typec_set_data_role(con->port, TYPEC_DEVICE);
1349 break;
1350 default:
1351 break;
1352 }
1353
1354 /* Check if there is already something connected */
1355 if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
1356 typec_set_pwr_role(con->port,
1357 !!(con->status.flags & UCSI_CONSTAT_PWR_DIR));
1358 ucsi_register_partner(con);
1359 ucsi_pwr_opmode_change(con);
1360 ucsi_port_psy_changed(con);
1361 }
1362
1363 /* Only notify USB controller if partner supports USB data */
1364 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
1365 u_role = USB_ROLE_NONE;
1366
1367 ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
1368 if (ret) {
1369 dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n",
1370 con->num, u_role);
1371 ret = 0;
1372 }
1373
1374 if (con->partner &&
1375 UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
1376 UCSI_CONSTAT_PWR_OPMODE_PD) {
1377 ucsi_get_src_pdos(con);
1378 ucsi_check_altmodes(con);
1379 }
1380
1381 trace_ucsi_register_port(con->num, &con->status);
1382
1383 out:
1384 fwnode_handle_put(cap->fwnode);
1385 out_unlock:
1386 mutex_unlock(&con->lock);
1387
1388 if (ret && con->wq) {
1389 destroy_workqueue(con->wq);
1390 con->wq = NULL;
1391 }
1392
1393 return ret;
1394 }
1395
1396 /**
1397 * ucsi_init - Initialize UCSI interface
1398 * @ucsi: UCSI to be initialized
1399 *
1400 * Registers all ports @ucsi has and enables all notification events.
1401 */
ucsi_init(struct ucsi * ucsi)1402 static int ucsi_init(struct ucsi *ucsi)
1403 {
1404 struct ucsi_connector *con, *connector;
1405 u64 command, ntfy;
1406 u32 cci;
1407 int ret;
1408 int i;
1409
1410 /* Reset the PPM */
1411 ret = ucsi_reset_ppm(ucsi);
1412 if (ret) {
1413 dev_err(ucsi->dev, "failed to reset PPM!\n");
1414 goto err;
1415 }
1416
1417 /* Enable basic notifications */
1418 ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
1419 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
1420 ret = ucsi_send_command(ucsi, command, NULL, 0);
1421 if (ret < 0)
1422 goto err_reset;
1423
1424 /* Get PPM capabilities */
1425 command = UCSI_GET_CAPABILITY;
1426 ret = ucsi_send_command(ucsi, command, &ucsi->cap, sizeof(ucsi->cap));
1427 if (ret < 0)
1428 goto err_reset;
1429
1430 if (!ucsi->cap.num_connectors) {
1431 ret = -ENODEV;
1432 goto err_reset;
1433 }
1434
1435 /* Allocate the connectors. Released in ucsi_unregister() */
1436 connector = kcalloc(ucsi->cap.num_connectors + 1, sizeof(*connector), GFP_KERNEL);
1437 if (!connector) {
1438 ret = -ENOMEM;
1439 goto err_reset;
1440 }
1441
1442 /* Register all connectors */
1443 for (i = 0; i < ucsi->cap.num_connectors; i++) {
1444 connector[i].num = i + 1;
1445 ret = ucsi_register_port(ucsi, &connector[i]);
1446 if (ret)
1447 goto err_unregister;
1448 }
1449
1450 /* Enable all notifications */
1451 ntfy = UCSI_ENABLE_NTFY_ALL;
1452 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
1453 ret = ucsi_send_command(ucsi, command, NULL, 0);
1454 if (ret < 0)
1455 goto err_unregister;
1456
1457 ucsi->connector = connector;
1458 ucsi->ntfy = ntfy;
1459
1460 mutex_lock(&ucsi->ppm_lock);
1461 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
1462 mutex_unlock(&ucsi->ppm_lock);
1463 if (ret)
1464 return ret;
1465 if (UCSI_CCI_CONNECTOR(cci))
1466 ucsi_connector_change(ucsi, UCSI_CCI_CONNECTOR(cci));
1467
1468 return 0;
1469
1470 err_unregister:
1471 for (con = connector; con->port; con++) {
1472 ucsi_unregister_partner(con);
1473 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON);
1474 ucsi_unregister_port_psy(con);
1475 if (con->wq)
1476 destroy_workqueue(con->wq);
1477
1478 usb_power_delivery_unregister_capabilities(con->port_sink_caps);
1479 con->port_sink_caps = NULL;
1480 usb_power_delivery_unregister_capabilities(con->port_source_caps);
1481 con->port_source_caps = NULL;
1482 usb_power_delivery_unregister(con->pd);
1483 con->pd = NULL;
1484 typec_unregister_port(con->port);
1485 con->port = NULL;
1486 }
1487 kfree(connector);
1488 err_reset:
1489 memset(&ucsi->cap, 0, sizeof(ucsi->cap));
1490 ucsi_reset_ppm(ucsi);
1491 err:
1492 return ret;
1493 }
1494
ucsi_resume_work(struct work_struct * work)1495 static void ucsi_resume_work(struct work_struct *work)
1496 {
1497 struct ucsi *ucsi = container_of(work, struct ucsi, resume_work);
1498 struct ucsi_connector *con;
1499 u64 command;
1500 int ret;
1501
1502 /* Restore UCSI notification enable mask after system resume */
1503 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
1504 ret = ucsi_send_command(ucsi, command, NULL, 0);
1505 if (ret < 0) {
1506 dev_err(ucsi->dev, "failed to re-enable notifications (%d)\n", ret);
1507 return;
1508 }
1509
1510 for (con = ucsi->connector; con->port; con++) {
1511 mutex_lock(&con->lock);
1512 ucsi_partner_task(con, ucsi_check_connection, 1, 0);
1513 mutex_unlock(&con->lock);
1514 }
1515 }
1516
ucsi_resume(struct ucsi * ucsi)1517 int ucsi_resume(struct ucsi *ucsi)
1518 {
1519 if (ucsi->connector)
1520 queue_work(system_long_wq, &ucsi->resume_work);
1521 return 0;
1522 }
1523 EXPORT_SYMBOL_GPL(ucsi_resume);
1524
ucsi_init_work(struct work_struct * work)1525 static void ucsi_init_work(struct work_struct *work)
1526 {
1527 struct ucsi *ucsi = container_of(work, struct ucsi, work.work);
1528 int ret;
1529
1530 ret = ucsi_init(ucsi);
1531 if (ret)
1532 dev_err_probe(ucsi->dev, ret, "PPM init failed\n");
1533
1534 if (ret == -EPROBE_DEFER) {
1535 if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) {
1536 dev_err(ucsi->dev, "PPM init failed, stop trying\n");
1537 return;
1538 }
1539
1540 queue_delayed_work(system_long_wq, &ucsi->work,
1541 UCSI_ROLE_SWITCH_INTERVAL);
1542 }
1543 }
1544
1545 /**
1546 * ucsi_get_drvdata - Return private driver data pointer
1547 * @ucsi: UCSI interface
1548 */
ucsi_get_drvdata(struct ucsi * ucsi)1549 void *ucsi_get_drvdata(struct ucsi *ucsi)
1550 {
1551 return ucsi->driver_data;
1552 }
1553 EXPORT_SYMBOL_GPL(ucsi_get_drvdata);
1554
1555 /**
1556 * ucsi_set_drvdata - Assign private driver data pointer
1557 * @ucsi: UCSI interface
1558 * @data: Private data pointer
1559 */
ucsi_set_drvdata(struct ucsi * ucsi,void * data)1560 void ucsi_set_drvdata(struct ucsi *ucsi, void *data)
1561 {
1562 ucsi->driver_data = data;
1563 }
1564 EXPORT_SYMBOL_GPL(ucsi_set_drvdata);
1565
1566 /**
1567 * ucsi_create - Allocate UCSI instance
1568 * @dev: Device interface to the PPM (Platform Policy Manager)
1569 * @ops: I/O routines
1570 */
ucsi_create(struct device * dev,const struct ucsi_operations * ops)1571 struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops)
1572 {
1573 struct ucsi *ucsi;
1574
1575 if (!ops || !ops->read || !ops->sync_write || !ops->async_write)
1576 return ERR_PTR(-EINVAL);
1577
1578 ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
1579 if (!ucsi)
1580 return ERR_PTR(-ENOMEM);
1581
1582 INIT_WORK(&ucsi->resume_work, ucsi_resume_work);
1583 INIT_DELAYED_WORK(&ucsi->work, ucsi_init_work);
1584 mutex_init(&ucsi->ppm_lock);
1585 ucsi->dev = dev;
1586 ucsi->ops = ops;
1587
1588 return ucsi;
1589 }
1590 EXPORT_SYMBOL_GPL(ucsi_create);
1591
1592 /**
1593 * ucsi_destroy - Free UCSI instance
1594 * @ucsi: UCSI instance to be freed
1595 */
ucsi_destroy(struct ucsi * ucsi)1596 void ucsi_destroy(struct ucsi *ucsi)
1597 {
1598 ucsi_debugfs_unregister(ucsi);
1599 kfree(ucsi);
1600 }
1601 EXPORT_SYMBOL_GPL(ucsi_destroy);
1602
1603 /**
1604 * ucsi_register - Register UCSI interface
1605 * @ucsi: UCSI instance
1606 */
ucsi_register(struct ucsi * ucsi)1607 int ucsi_register(struct ucsi *ucsi)
1608 {
1609 int ret;
1610
1611 ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version,
1612 sizeof(ucsi->version));
1613 if (ret)
1614 return ret;
1615
1616 if (!ucsi->version)
1617 return -ENODEV;
1618
1619 /*
1620 * Version format is JJ.M.N (JJ = Major version, M = Minor version,
1621 * N = sub-minor version).
1622 */
1623 dev_dbg(ucsi->dev, "Registered UCSI interface with version %x.%x.%x",
1624 UCSI_BCD_GET_MAJOR(ucsi->version),
1625 UCSI_BCD_GET_MINOR(ucsi->version),
1626 UCSI_BCD_GET_SUBMINOR(ucsi->version));
1627
1628 queue_delayed_work(system_long_wq, &ucsi->work, 0);
1629
1630 ucsi_debugfs_register(ucsi);
1631 return 0;
1632 }
1633 EXPORT_SYMBOL_GPL(ucsi_register);
1634
1635 /**
1636 * ucsi_unregister - Unregister UCSI interface
1637 * @ucsi: UCSI interface to be unregistered
1638 *
1639 * Unregister UCSI interface that was created with ucsi_register().
1640 */
ucsi_unregister(struct ucsi * ucsi)1641 void ucsi_unregister(struct ucsi *ucsi)
1642 {
1643 u64 cmd = UCSI_SET_NOTIFICATION_ENABLE;
1644 int i;
1645
1646 /* Make sure that we are not in the middle of driver initialization */
1647 cancel_delayed_work_sync(&ucsi->work);
1648 cancel_work_sync(&ucsi->resume_work);
1649
1650 /* Disable notifications */
1651 ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
1652
1653 if (!ucsi->connector)
1654 return;
1655
1656 for (i = 0; i < ucsi->cap.num_connectors; i++) {
1657 cancel_work_sync(&ucsi->connector[i].work);
1658 ucsi_unregister_partner(&ucsi->connector[i]);
1659 ucsi_unregister_altmodes(&ucsi->connector[i],
1660 UCSI_RECIPIENT_CON);
1661 ucsi_unregister_port_psy(&ucsi->connector[i]);
1662
1663 if (ucsi->connector[i].wq) {
1664 struct ucsi_work *uwork;
1665
1666 mutex_lock(&ucsi->connector[i].lock);
1667 /*
1668 * queue delayed items immediately so they can execute
1669 * and free themselves before the wq is destroyed
1670 */
1671 list_for_each_entry(uwork, &ucsi->connector[i].partner_tasks, node)
1672 mod_delayed_work(ucsi->connector[i].wq, &uwork->work, 0);
1673 mutex_unlock(&ucsi->connector[i].lock);
1674 destroy_workqueue(ucsi->connector[i].wq);
1675 }
1676
1677 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_sink_caps);
1678 ucsi->connector[i].port_sink_caps = NULL;
1679 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_source_caps);
1680 ucsi->connector[i].port_source_caps = NULL;
1681 usb_power_delivery_unregister(ucsi->connector[i].pd);
1682 ucsi->connector[i].pd = NULL;
1683 typec_unregister_port(ucsi->connector[i].port);
1684 }
1685
1686 kfree(ucsi->connector);
1687 }
1688 EXPORT_SYMBOL_GPL(ucsi_unregister);
1689
ucsi_module_init(void)1690 static int __init ucsi_module_init(void)
1691 {
1692 ucsi_debugfs_init();
1693 return 0;
1694 }
1695 module_init(ucsi_module_init);
1696
ucsi_module_exit(void)1697 static void __exit ucsi_module_exit(void)
1698 {
1699 ucsi_debugfs_exit();
1700 }
1701 module_exit(ucsi_module_exit);
1702
1703 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
1704 MODULE_LICENSE("GPL v2");
1705 MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver");
1706