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