1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * USB Typec-C DisplayPort Alternate Mode driver
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 *
8 * DisplayPort is trademark of VESA (www.vesa.org)
9 */
10
11 #include <linux/delay.h>
12 #include <linux/mutex.h>
13 #include <linux/module.h>
14 #include <linux/property.h>
15 #include <linux/usb/pd_vdo.h>
16 #include <linux/usb/typec_dp.h>
17 #include <drm/drm_connector.h>
18 #include "displayport.h"
19
20 #define DP_HEADER(_dp, ver, cmd) (VDO((_dp)->alt->svid, 1, ver, cmd) \
21 | VDO_OPOS(USB_TYPEC_DP_MODE))
22
23 enum {
24 DP_CONF_USB,
25 DP_CONF_DFP_D,
26 DP_CONF_UFP_D,
27 DP_CONF_DUAL_D,
28 };
29
30 /* Pin assignments that use USB3.1 Gen2 signaling to carry DP protocol */
31 #define DP_PIN_ASSIGN_GEN2_BR_MASK (BIT(DP_PIN_ASSIGN_A) | \
32 BIT(DP_PIN_ASSIGN_B))
33
34 /* Pin assignments that use DP v1.3 signaling to carry DP protocol */
35 #define DP_PIN_ASSIGN_DP_BR_MASK (BIT(DP_PIN_ASSIGN_C) | \
36 BIT(DP_PIN_ASSIGN_D) | \
37 BIT(DP_PIN_ASSIGN_E) | \
38 BIT(DP_PIN_ASSIGN_F))
39
40 /* DP only pin assignments */
41 #define DP_PIN_ASSIGN_DP_ONLY_MASK (BIT(DP_PIN_ASSIGN_A) | \
42 BIT(DP_PIN_ASSIGN_C) | \
43 BIT(DP_PIN_ASSIGN_E))
44
45 /* Pin assignments where one channel is for USB */
46 #define DP_PIN_ASSIGN_MULTI_FUNC_MASK (BIT(DP_PIN_ASSIGN_B) | \
47 BIT(DP_PIN_ASSIGN_D) | \
48 BIT(DP_PIN_ASSIGN_F))
49
50 enum dp_state {
51 DP_STATE_IDLE,
52 DP_STATE_ENTER,
53 DP_STATE_ENTER_PRIME,
54 DP_STATE_UPDATE,
55 DP_STATE_CONFIGURE,
56 DP_STATE_CONFIGURE_PRIME,
57 DP_STATE_EXIT,
58 DP_STATE_EXIT_PRIME,
59 };
60
61 struct dp_altmode {
62 struct typec_displayport_data data;
63 struct typec_displayport_data data_prime;
64
65 enum dp_state state;
66 bool hpd;
67 bool pending_hpd;
68
69 struct mutex lock; /* device lock */
70 struct work_struct work;
71 struct typec_altmode *alt;
72 const struct typec_altmode *port;
73 struct fwnode_handle *connector_fwnode;
74 struct typec_altmode *plug_prime;
75 };
76
dp_altmode_notify(struct dp_altmode * dp)77 static int dp_altmode_notify(struct dp_altmode *dp)
78 {
79 unsigned long conf;
80 u8 state;
81
82 if (dp->data.conf) {
83 state = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf));
84 conf = TYPEC_MODAL_STATE(state);
85 } else {
86 conf = TYPEC_STATE_USB;
87 }
88
89 return typec_altmode_notify(dp->alt, conf, &dp->data);
90 }
91
dp_altmode_configure(struct dp_altmode * dp,u8 con)92 static int dp_altmode_configure(struct dp_altmode *dp, u8 con)
93 {
94 u8 pin_assign = 0;
95 u32 conf;
96
97 /* DP Signalling */
98 conf = (dp->data.conf & DP_CONF_SIGNALLING_MASK) >> DP_CONF_SIGNALLING_SHIFT;
99
100 switch (con) {
101 case DP_STATUS_CON_DISABLED:
102 return 0;
103 case DP_STATUS_CON_DFP_D:
104 conf |= DP_CONF_UFP_U_AS_DFP_D;
105 pin_assign = DP_CAP_UFP_D_PIN_ASSIGN(dp->alt->vdo) &
106 DP_CAP_DFP_D_PIN_ASSIGN(dp->port->vdo);
107 /* Account for active cable capabilities */
108 if (dp->plug_prime)
109 pin_assign &= DP_CAP_DFP_D_PIN_ASSIGN(dp->plug_prime->vdo);
110 break;
111 case DP_STATUS_CON_UFP_D:
112 case DP_STATUS_CON_BOTH: /* NOTE: First acting as DP source */
113 conf |= DP_CONF_UFP_U_AS_UFP_D;
114 pin_assign = DP_CAP_PIN_ASSIGN_UFP_D(dp->alt->vdo) &
115 DP_CAP_PIN_ASSIGN_DFP_D(dp->port->vdo);
116 /* Account for active cable capabilities */
117 if (dp->plug_prime)
118 pin_assign &= DP_CAP_UFP_D_PIN_ASSIGN(dp->plug_prime->vdo);
119 break;
120 default:
121 break;
122 }
123
124 /* Determining the initial pin assignment. */
125 if (!DP_CONF_GET_PIN_ASSIGN(dp->data.conf)) {
126 /* Is USB together with DP preferred */
127 if (dp->data.status & DP_STATUS_PREFER_MULTI_FUNC &&
128 pin_assign & DP_PIN_ASSIGN_MULTI_FUNC_MASK)
129 pin_assign &= DP_PIN_ASSIGN_MULTI_FUNC_MASK;
130 else if (pin_assign & DP_PIN_ASSIGN_DP_ONLY_MASK) {
131 pin_assign &= DP_PIN_ASSIGN_DP_ONLY_MASK;
132 /* Default to pin assign C if available */
133 if (pin_assign & BIT(DP_PIN_ASSIGN_C))
134 pin_assign = BIT(DP_PIN_ASSIGN_C);
135 }
136
137 if (!pin_assign)
138 return -EINVAL;
139
140 conf |= DP_CONF_SET_PIN_ASSIGN(pin_assign);
141 }
142
143 dp->data.conf = conf;
144 if (dp->plug_prime)
145 dp->data_prime.conf = conf;
146
147 return 0;
148 }
149
dp_altmode_status_update(struct dp_altmode * dp)150 static int dp_altmode_status_update(struct dp_altmode *dp)
151 {
152 bool configured = !!DP_CONF_GET_PIN_ASSIGN(dp->data.conf);
153 bool hpd = !!(dp->data.status & DP_STATUS_HPD_STATE);
154 u8 con = DP_STATUS_CONNECTION(dp->data.status);
155 int ret = 0;
156
157 if (configured && (dp->data.status & DP_STATUS_SWITCH_TO_USB)) {
158 dp->data.conf = 0;
159 dp->data_prime.conf = 0;
160 dp->state = dp->plug_prime ? DP_STATE_CONFIGURE_PRIME :
161 DP_STATE_CONFIGURE;
162 } else if (dp->data.status & DP_STATUS_EXIT_DP_MODE) {
163 dp->state = DP_STATE_EXIT;
164 } else if (!(con & DP_CONF_CURRENTLY(dp->data.conf))) {
165 ret = dp_altmode_configure(dp, con);
166 if (!ret) {
167 dp->state = dp->plug_prime ? DP_STATE_CONFIGURE_PRIME :
168 DP_STATE_CONFIGURE;
169 if (dp->hpd != hpd) {
170 dp->hpd = hpd;
171 dp->pending_hpd = true;
172 }
173 }
174 } else {
175 drm_connector_oob_hotplug_event(dp->connector_fwnode,
176 hpd ? connector_status_connected :
177 connector_status_disconnected);
178 dp->hpd = hpd;
179 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
180 }
181
182 return ret;
183 }
184
dp_altmode_configured(struct dp_altmode * dp)185 static int dp_altmode_configured(struct dp_altmode *dp)
186 {
187 sysfs_notify(&dp->alt->dev.kobj, "displayport", "configuration");
188 sysfs_notify(&dp->alt->dev.kobj, "displayport", "pin_assignment");
189 /*
190 * If the DFP_D/UFP_D sends a change in HPD when first notifying the
191 * DisplayPort driver that it is connected, then we wait until
192 * configuration is complete to signal HPD.
193 */
194 if (dp->pending_hpd) {
195 drm_connector_oob_hotplug_event(dp->connector_fwnode,
196 connector_status_connected);
197 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
198 dp->pending_hpd = false;
199 }
200
201 return dp_altmode_notify(dp);
202 }
203
dp_altmode_configure_vdm(struct dp_altmode * dp,u32 conf)204 static int dp_altmode_configure_vdm(struct dp_altmode *dp, u32 conf)
205 {
206 int svdm_version = typec_altmode_get_svdm_version(dp->alt);
207 u32 header;
208 int ret;
209
210 if (svdm_version < 0)
211 return svdm_version;
212
213 header = DP_HEADER(dp, svdm_version, DP_CMD_CONFIGURE);
214 ret = typec_altmode_notify(dp->alt, TYPEC_STATE_SAFE, &dp->data);
215 if (ret) {
216 dev_err(&dp->alt->dev,
217 "unable to put to connector to safe mode\n");
218 return ret;
219 }
220
221 ret = typec_altmode_vdm(dp->alt, header, &conf, 2);
222 if (ret)
223 dp_altmode_notify(dp);
224
225 return ret;
226 }
227
dp_altmode_configure_vdm_cable(struct dp_altmode * dp,u32 conf)228 static int dp_altmode_configure_vdm_cable(struct dp_altmode *dp, u32 conf)
229 {
230 int svdm_version = typec_altmode_get_cable_svdm_version(dp->plug_prime);
231 u32 header;
232
233 if (svdm_version < 0)
234 return svdm_version;
235
236 header = DP_HEADER(dp, svdm_version, DP_CMD_CONFIGURE);
237
238 return typec_cable_altmode_vdm(dp->plug_prime, TYPEC_PLUG_SOP_P, header, &conf, 2);
239 }
240
dp_altmode_work(struct work_struct * work)241 static void dp_altmode_work(struct work_struct *work)
242 {
243 struct dp_altmode *dp = container_of(work, struct dp_altmode, work);
244 int svdm_version;
245 u32 header;
246 u32 vdo;
247 int ret;
248
249 mutex_lock(&dp->lock);
250
251 switch (dp->state) {
252 case DP_STATE_ENTER:
253 ret = typec_altmode_enter(dp->alt, NULL);
254 if (ret && ret != -EBUSY)
255 dev_err(&dp->alt->dev, "failed to enter mode: %d\n", ret);
256 break;
257 case DP_STATE_ENTER_PRIME:
258 ret = typec_cable_altmode_enter(dp->alt, TYPEC_PLUG_SOP_P, NULL);
259 /*
260 * If we fail to enter Alt Mode on SOP', then we should drop the
261 * plug from the driver and attempt to run the driver without
262 * it.
263 */
264 if (ret && ret != -EBUSY) {
265 dev_err(&dp->alt->dev, "plug failed to enter mode\n");
266 dp->state = DP_STATE_ENTER;
267 goto disable_prime;
268 }
269 break;
270 case DP_STATE_UPDATE:
271 svdm_version = typec_altmode_get_svdm_version(dp->alt);
272 if (svdm_version < 0)
273 break;
274 header = DP_HEADER(dp, svdm_version, DP_CMD_STATUS_UPDATE);
275 vdo = 1;
276 ret = typec_altmode_vdm(dp->alt, header, &vdo, 2);
277 if (ret)
278 dev_err(&dp->alt->dev,
279 "unable to send Status Update command (%d)\n",
280 ret);
281 break;
282 case DP_STATE_CONFIGURE:
283 ret = dp_altmode_configure_vdm(dp, dp->data.conf);
284 if (ret)
285 dev_err(&dp->alt->dev,
286 "unable to send Configure command (%d)\n", ret);
287 break;
288 case DP_STATE_CONFIGURE_PRIME:
289 ret = dp_altmode_configure_vdm_cable(dp, dp->data_prime.conf);
290 if (ret) {
291 dev_err(&dp->plug_prime->dev,
292 "unable to send Configure command (%d)\n",
293 ret);
294 dp->state = DP_STATE_CONFIGURE;
295 goto disable_prime;
296 }
297 break;
298 case DP_STATE_EXIT:
299 if (typec_altmode_exit(dp->alt))
300 dev_err(&dp->alt->dev, "Exit Mode Failed!\n");
301 break;
302 case DP_STATE_EXIT_PRIME:
303 if (typec_cable_altmode_exit(dp->plug_prime, TYPEC_PLUG_SOP_P))
304 dev_err(&dp->plug_prime->dev, "Exit Mode Failed!\n");
305 break;
306 default:
307 break;
308 }
309
310 dp->state = DP_STATE_IDLE;
311
312 mutex_unlock(&dp->lock);
313 return;
314
315 disable_prime:
316 typec_altmode_put_plug(dp->plug_prime);
317 dp->plug_prime = NULL;
318 schedule_work(&dp->work);
319 mutex_unlock(&dp->lock);
320 }
321
dp_altmode_attention(struct typec_altmode * alt,const u32 vdo)322 static void dp_altmode_attention(struct typec_altmode *alt, const u32 vdo)
323 {
324 struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
325 u8 old_state;
326
327 mutex_lock(&dp->lock);
328
329 old_state = dp->state;
330 dp->data.status = vdo;
331
332 if (old_state != DP_STATE_IDLE)
333 dev_warn(&alt->dev, "ATTENTION while processing state %d\n",
334 old_state);
335
336 if (dp_altmode_status_update(dp))
337 dev_warn(&alt->dev, "%s: status update failed\n", __func__);
338
339 if (dp_altmode_notify(dp))
340 dev_err(&alt->dev, "%s: notification failed\n", __func__);
341
342 if (old_state == DP_STATE_IDLE && dp->state != DP_STATE_IDLE)
343 schedule_work(&dp->work);
344
345 mutex_unlock(&dp->lock);
346 }
347
dp_altmode_vdm(struct typec_altmode * alt,const u32 hdr,const u32 * vdo,int count)348 static int dp_altmode_vdm(struct typec_altmode *alt,
349 const u32 hdr, const u32 *vdo, int count)
350 {
351 struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
352 int cmd_type = PD_VDO_CMDT(hdr);
353 int cmd = PD_VDO_CMD(hdr);
354 int ret = 0;
355
356 mutex_lock(&dp->lock);
357
358 if (dp->state != DP_STATE_IDLE) {
359 ret = -EBUSY;
360 goto err_unlock;
361 }
362
363 switch (cmd_type) {
364 case CMDT_RSP_ACK:
365 switch (cmd) {
366 case CMD_ENTER_MODE:
367 typec_altmode_update_active(alt, true);
368 dp->state = DP_STATE_UPDATE;
369 break;
370 case CMD_EXIT_MODE:
371 typec_altmode_update_active(alt, false);
372 dp->data.status = 0;
373 dp->data.conf = 0;
374 if (dp->hpd) {
375 drm_connector_oob_hotplug_event(dp->connector_fwnode,
376 connector_status_disconnected);
377 dp->hpd = false;
378 sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
379 }
380 if (dp->plug_prime)
381 dp->state = DP_STATE_EXIT_PRIME;
382 break;
383 case DP_CMD_STATUS_UPDATE:
384 dp->data.status = *vdo;
385 ret = dp_altmode_status_update(dp);
386 break;
387 case DP_CMD_CONFIGURE:
388 ret = dp_altmode_configured(dp);
389 break;
390 default:
391 break;
392 }
393 break;
394 case CMDT_RSP_NAK:
395 switch (cmd) {
396 case DP_CMD_STATUS_UPDATE:
397 dp->state = DP_STATE_EXIT;
398 break;
399 case DP_CMD_CONFIGURE:
400 dp->data.conf = 0;
401 ret = dp_altmode_configured(dp);
402 break;
403 default:
404 break;
405 }
406 break;
407 default:
408 break;
409 }
410
411 if (dp->state != DP_STATE_IDLE)
412 schedule_work(&dp->work);
413
414 err_unlock:
415 mutex_unlock(&dp->lock);
416 return ret;
417 }
418
dp_cable_altmode_vdm(struct typec_altmode * alt,enum typec_plug_index sop,const u32 hdr,const u32 * vdo,int count)419 static int dp_cable_altmode_vdm(struct typec_altmode *alt, enum typec_plug_index sop,
420 const u32 hdr, const u32 *vdo, int count)
421 {
422 struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
423 int cmd_type = PD_VDO_CMDT(hdr);
424 int cmd = PD_VDO_CMD(hdr);
425 int ret = 0;
426
427 mutex_lock(&dp->lock);
428
429 if (dp->state != DP_STATE_IDLE) {
430 ret = -EBUSY;
431 goto err_unlock;
432 }
433
434 switch (cmd_type) {
435 case CMDT_RSP_ACK:
436 switch (cmd) {
437 case CMD_ENTER_MODE:
438 typec_altmode_update_active(dp->plug_prime, true);
439 dp->state = DP_STATE_ENTER;
440 break;
441 case CMD_EXIT_MODE:
442 dp->data_prime.status = 0;
443 dp->data_prime.conf = 0;
444 typec_altmode_update_active(dp->plug_prime, false);
445 break;
446 case DP_CMD_CONFIGURE:
447 dp->state = DP_STATE_CONFIGURE;
448 break;
449 default:
450 break;
451 }
452 break;
453 case CMDT_RSP_NAK:
454 switch (cmd) {
455 case DP_CMD_CONFIGURE:
456 dp->data_prime.conf = 0;
457 /* Attempt to configure on SOP, drop plug */
458 typec_altmode_put_plug(dp->plug_prime);
459 dp->plug_prime = NULL;
460 dp->state = DP_STATE_CONFIGURE;
461 break;
462 default:
463 break;
464 }
465 break;
466 default:
467 break;
468 }
469
470 if (dp->state != DP_STATE_IDLE)
471 schedule_work(&dp->work);
472
473 err_unlock:
474 mutex_unlock(&dp->lock);
475 return ret;
476 }
477
dp_altmode_activate(struct typec_altmode * alt,int activate)478 static int dp_altmode_activate(struct typec_altmode *alt, int activate)
479 {
480 struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
481 int ret;
482
483 if (activate) {
484 if (dp->plug_prime) {
485 ret = typec_cable_altmode_enter(alt, TYPEC_PLUG_SOP_P, NULL);
486 if (ret < 0) {
487 typec_altmode_put_plug(dp->plug_prime);
488 dp->plug_prime = NULL;
489 } else {
490 return ret;
491 }
492 }
493 return typec_altmode_enter(alt, NULL);
494 } else {
495 return typec_altmode_exit(alt);
496 }
497 }
498
499 static const struct typec_altmode_ops dp_altmode_ops = {
500 .attention = dp_altmode_attention,
501 .vdm = dp_altmode_vdm,
502 .activate = dp_altmode_activate,
503 };
504
505 static const struct typec_cable_ops dp_cable_ops = {
506 .vdm = dp_cable_altmode_vdm,
507 };
508
509 static const char * const configurations[] = {
510 [DP_CONF_USB] = "USB",
511 [DP_CONF_DFP_D] = "source",
512 [DP_CONF_UFP_D] = "sink",
513 };
514
515 static ssize_t
configuration_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)516 configuration_store(struct device *dev, struct device_attribute *attr,
517 const char *buf, size_t size)
518 {
519 struct dp_altmode *dp = dev_get_drvdata(dev);
520 u32 conf;
521 u32 cap;
522 int con;
523 int ret = 0;
524
525 con = sysfs_match_string(configurations, buf);
526 if (con < 0)
527 return con;
528
529 mutex_lock(&dp->lock);
530
531 if (dp->state != DP_STATE_IDLE) {
532 ret = -EBUSY;
533 goto err_unlock;
534 }
535
536 cap = DP_CAP_CAPABILITY(dp->alt->vdo);
537
538 if ((con == DP_CONF_DFP_D && !(cap & DP_CAP_DFP_D)) ||
539 (con == DP_CONF_UFP_D && !(cap & DP_CAP_UFP_D))) {
540 ret = -EINVAL;
541 goto err_unlock;
542 }
543
544 conf = dp->data.conf & ~DP_CONF_DUAL_D;
545 conf |= con;
546
547 if (dp->alt->active) {
548 ret = dp_altmode_configure_vdm(dp, conf);
549 if (ret)
550 goto err_unlock;
551 }
552
553 dp->data.conf = conf;
554
555 err_unlock:
556 mutex_unlock(&dp->lock);
557
558 return ret ? ret : size;
559 }
560
configuration_show(struct device * dev,struct device_attribute * attr,char * buf)561 static ssize_t configuration_show(struct device *dev,
562 struct device_attribute *attr, char *buf)
563 {
564 struct dp_altmode *dp = dev_get_drvdata(dev);
565 int len;
566 u8 cap;
567 u8 cur;
568 int i;
569
570 mutex_lock(&dp->lock);
571
572 cap = DP_CAP_CAPABILITY(dp->alt->vdo);
573 cur = DP_CONF_CURRENTLY(dp->data.conf);
574
575 len = sprintf(buf, "%s ", cur ? "USB" : "[USB]");
576
577 for (i = 1; i < ARRAY_SIZE(configurations); i++) {
578 if (i == cur)
579 len += sprintf(buf + len, "[%s] ", configurations[i]);
580 else if ((i == DP_CONF_DFP_D && cap & DP_CAP_DFP_D) ||
581 (i == DP_CONF_UFP_D && cap & DP_CAP_UFP_D))
582 len += sprintf(buf + len, "%s ", configurations[i]);
583 }
584
585 mutex_unlock(&dp->lock);
586
587 buf[len - 1] = '\n';
588 return len;
589 }
590 static DEVICE_ATTR_RW(configuration);
591
592 static const char * const pin_assignments[] = {
593 [DP_PIN_ASSIGN_A] = "A",
594 [DP_PIN_ASSIGN_B] = "B",
595 [DP_PIN_ASSIGN_C] = "C",
596 [DP_PIN_ASSIGN_D] = "D",
597 [DP_PIN_ASSIGN_E] = "E",
598 [DP_PIN_ASSIGN_F] = "F",
599 };
600
601 /*
602 * Helper function to extract a peripheral's currently supported
603 * Pin Assignments from its DisplayPort alternate mode state.
604 */
get_current_pin_assignments(struct dp_altmode * dp)605 static u8 get_current_pin_assignments(struct dp_altmode *dp)
606 {
607 if (DP_CONF_CURRENTLY(dp->data.conf) == DP_CONF_UFP_U_AS_DFP_D)
608 return DP_CAP_PIN_ASSIGN_DFP_D(dp->alt->vdo);
609 else
610 return DP_CAP_PIN_ASSIGN_UFP_D(dp->alt->vdo);
611 }
612
613 static ssize_t
pin_assignment_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)614 pin_assignment_store(struct device *dev, struct device_attribute *attr,
615 const char *buf, size_t size)
616 {
617 struct dp_altmode *dp = dev_get_drvdata(dev);
618 u8 assignments;
619 u32 conf;
620 int ret;
621
622 ret = sysfs_match_string(pin_assignments, buf);
623 if (ret < 0)
624 return ret;
625
626 conf = DP_CONF_SET_PIN_ASSIGN(BIT(ret));
627 ret = 0;
628
629 mutex_lock(&dp->lock);
630
631 if (conf & dp->data.conf)
632 goto out_unlock;
633
634 if (dp->state != DP_STATE_IDLE) {
635 ret = -EBUSY;
636 goto out_unlock;
637 }
638
639 assignments = get_current_pin_assignments(dp);
640
641 if (!(DP_CONF_GET_PIN_ASSIGN(conf) & assignments)) {
642 ret = -EINVAL;
643 goto out_unlock;
644 }
645
646 conf |= dp->data.conf & ~DP_CONF_PIN_ASSIGNEMENT_MASK;
647
648 /* Only send Configure command if a configuration has been set */
649 if (dp->alt->active && DP_CONF_CURRENTLY(dp->data.conf)) {
650 /* todo: send manual configure over SOP'*/
651 ret = dp_altmode_configure_vdm(dp, conf);
652 if (ret)
653 goto out_unlock;
654 }
655
656 dp->data.conf = conf;
657
658 out_unlock:
659 mutex_unlock(&dp->lock);
660
661 return ret ? ret : size;
662 }
663
pin_assignment_show(struct device * dev,struct device_attribute * attr,char * buf)664 static ssize_t pin_assignment_show(struct device *dev,
665 struct device_attribute *attr, char *buf)
666 {
667 struct dp_altmode *dp = dev_get_drvdata(dev);
668 u8 assignments;
669 int len = 0;
670 u8 cur;
671 int i;
672
673 mutex_lock(&dp->lock);
674
675 cur = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf));
676
677 assignments = get_current_pin_assignments(dp);
678
679 for (i = 0; assignments && i < DP_PIN_ASSIGN_MAX; assignments >>= 1, i++) {
680 if (assignments & 1) {
681 if (i == cur)
682 len += sprintf(buf + len, "[%s] ",
683 pin_assignments[i]);
684 else
685 len += sprintf(buf + len, "%s ",
686 pin_assignments[i]);
687 }
688 }
689
690 mutex_unlock(&dp->lock);
691
692 /* get_current_pin_assignments can return 0 when no matching pin assignments are found */
693 if (len == 0)
694 len++;
695
696 buf[len - 1] = '\n';
697 return len;
698 }
699 static DEVICE_ATTR_RW(pin_assignment);
700
hpd_show(struct device * dev,struct device_attribute * attr,char * buf)701 static ssize_t hpd_show(struct device *dev, struct device_attribute *attr, char *buf)
702 {
703 struct dp_altmode *dp = dev_get_drvdata(dev);
704
705 return sysfs_emit(buf, "%d\n", dp->hpd);
706 }
707 static DEVICE_ATTR_RO(hpd);
708
709 static struct attribute *displayport_attrs[] = {
710 &dev_attr_configuration.attr,
711 &dev_attr_pin_assignment.attr,
712 &dev_attr_hpd.attr,
713 NULL
714 };
715
716 static const struct attribute_group displayport_group = {
717 .name = "displayport",
718 .attrs = displayport_attrs,
719 };
720
721 static const struct attribute_group *displayport_groups[] = {
722 &displayport_group,
723 NULL,
724 };
725
dp_altmode_probe(struct typec_altmode * alt)726 int dp_altmode_probe(struct typec_altmode *alt)
727 {
728 const struct typec_altmode *port = typec_altmode_get_partner(alt);
729 struct typec_altmode *plug = typec_altmode_get_plug(alt, TYPEC_PLUG_SOP_P);
730 struct fwnode_handle *fwnode;
731 struct dp_altmode *dp;
732
733 /* FIXME: Port can only be DFP_U. */
734
735 /* Make sure we have compatible pin configurations */
736 if (!(DP_CAP_PIN_ASSIGN_DFP_D(port->vdo) &
737 DP_CAP_PIN_ASSIGN_UFP_D(alt->vdo)) &&
738 !(DP_CAP_PIN_ASSIGN_UFP_D(port->vdo) &
739 DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo)))
740 return -ENODEV;
741
742 dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL);
743 if (!dp)
744 return -ENOMEM;
745
746 INIT_WORK(&dp->work, dp_altmode_work);
747 mutex_init(&dp->lock);
748 dp->port = port;
749 dp->alt = alt;
750
751 alt->desc = "DisplayPort";
752 typec_altmode_set_ops(alt, &dp_altmode_ops);
753
754 if (plug) {
755 plug->desc = "Displayport";
756 plug->cable_ops = &dp_cable_ops;
757 }
758
759 dp->plug_prime = plug;
760
761 fwnode = dev_fwnode(alt->dev.parent->parent); /* typec_port fwnode */
762 if (fwnode_property_present(fwnode, "displayport"))
763 dp->connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
764 else
765 dp->connector_fwnode = fwnode_handle_get(fwnode); /* embedded DP */
766 if (IS_ERR(dp->connector_fwnode))
767 dp->connector_fwnode = NULL;
768
769 typec_altmode_set_drvdata(alt, dp);
770 if (plug)
771 typec_altmode_set_drvdata(plug, dp);
772
773 dp->state = plug ? DP_STATE_ENTER_PRIME : DP_STATE_ENTER;
774 schedule_work(&dp->work);
775
776 return 0;
777 }
778 EXPORT_SYMBOL_GPL(dp_altmode_probe);
779
dp_altmode_remove(struct typec_altmode * alt)780 void dp_altmode_remove(struct typec_altmode *alt)
781 {
782 struct dp_altmode *dp = typec_altmode_get_drvdata(alt);
783
784 cancel_work_sync(&dp->work);
785 typec_altmode_put_plug(dp->plug_prime);
786
787 if (dp->connector_fwnode) {
788 drm_connector_oob_hotplug_event(dp->connector_fwnode,
789 connector_status_disconnected);
790
791 fwnode_handle_put(dp->connector_fwnode);
792 }
793 }
794 EXPORT_SYMBOL_GPL(dp_altmode_remove);
795
796 static const struct typec_device_id dp_typec_id[] = {
797 { USB_TYPEC_DP_SID },
798 { },
799 };
800 MODULE_DEVICE_TABLE(typec, dp_typec_id);
801
802 static struct typec_altmode_driver dp_altmode_driver = {
803 .id_table = dp_typec_id,
804 .probe = dp_altmode_probe,
805 .remove = dp_altmode_remove,
806 .driver = {
807 .name = "typec_displayport",
808 .dev_groups = displayport_groups,
809 },
810 };
811 module_typec_altmode_driver(dp_altmode_driver);
812
813 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
814 MODULE_LICENSE("GPL v2");
815 MODULE_DESCRIPTION("DisplayPort Alternate Mode");
816