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