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