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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / staging / greybus / light.c
blobd6ba25f21d807148914f3a36eb24ad44649e6e53
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Greybus Lights protocol driver.
4 *
5 * Copyright 2015 Google Inc.
6 * Copyright 2015 Linaro Ltd.
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/leds.h>
11 #include <linux/led-class-flash.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/greybus.h>
15 #include <media/v4l2-flash-led-class.h>
16
17 #define NAMES_MAX 32
18
19 struct gb_channel {
20 u8 id;
21 u32 flags;
22 u32 color;
23 char *color_name;
24 u8 fade_in;
25 u8 fade_out;
26 u32 mode;
27 char *mode_name;
28 struct attribute **attrs;
29 struct attribute_group *attr_group;
30 const struct attribute_group **attr_groups;
31 struct led_classdev *led;
32 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
33 struct led_classdev_flash fled;
34 struct led_flash_setting intensity_uA;
35 struct led_flash_setting timeout_us;
36 #else
37 struct led_classdev cled;
38 #endif
39 struct gb_light *light;
40 bool is_registered;
41 bool releasing;
42 bool strobe_state;
43 bool active;
44 struct mutex lock;
45 };
46
47 struct gb_light {
48 u8 id;
49 char *name;
50 struct gb_lights *glights;
51 u32 flags;
52 u8 channels_count;
53 struct gb_channel *channels;
54 bool has_flash;
55 bool ready;
56 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
57 struct v4l2_flash *v4l2_flash;
58 struct v4l2_flash *v4l2_flash_ind;
59 #endif
60 };
61
62 struct gb_lights {
63 struct gb_connection *connection;
64 u8 lights_count;
65 struct gb_light *lights;
66 struct mutex lights_lock;
67 };
68
69 static void gb_lights_channel_free(struct gb_channel *channel);
70
71 static struct gb_connection *get_conn_from_channel(struct gb_channel *channel)
72 {
73 return channel->light->glights->connection;
74 }
75
76 static struct gb_connection *get_conn_from_light(struct gb_light *light)
77 {
78 return light->glights->connection;
79 }
80
81 static bool is_channel_flash(struct gb_channel *channel)
82 {
83 return !!(channel->mode & (GB_CHANNEL_MODE_FLASH | GB_CHANNEL_MODE_TORCH
84 | GB_CHANNEL_MODE_INDICATOR));
85 }
86
87 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
88 static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
89 {
90 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
91
92 return container_of(fled_cdev, struct gb_channel, fled);
93 }
94
95 static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
96 {
97 return &channel->fled.led_cdev;
98 }
99
100 static struct gb_channel *get_channel_from_mode(struct gb_light *light,
101 u32 mode)
102 {
103 struct gb_channel *channel = NULL;
104 int i;
105
106 for (i = 0; i < light->channels_count; i++) {
107 channel = &light->channels[i];
108 if (channel && channel->mode == mode)
109 break;
110 }
111 return channel;
112 }
113
114 static int __gb_lights_flash_intensity_set(struct gb_channel *channel,
115 u32 intensity)
116 {
117 struct gb_connection *connection = get_conn_from_channel(channel);
118 struct gb_bundle *bundle = connection->bundle;
119 struct gb_lights_set_flash_intensity_request req;
120 int ret;
121
122 if (channel->releasing)
123 return -ESHUTDOWN;
124
125 ret = gb_pm_runtime_get_sync(bundle);
126 if (ret < 0)
127 return ret;
128
129 req.light_id = channel->light->id;
130 req.channel_id = channel->id;
131 req.intensity_uA = cpu_to_le32(intensity);
132
133 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_INTENSITY,
134 &req, sizeof(req), NULL, 0);
135
136 gb_pm_runtime_put_autosuspend(bundle);
137
138 return ret;
139 }
140
141 static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
142 {
143 u32 intensity;
144
145 /* If the channel is flash we need to get the attached torch channel */
146 if (channel->mode & GB_CHANNEL_MODE_FLASH)
147 channel = get_channel_from_mode(channel->light,
148 GB_CHANNEL_MODE_TORCH);
149
150 /* For not flash we need to convert brightness to intensity */
151 intensity = channel->intensity_uA.min +
152 (channel->intensity_uA.step * channel->led->brightness);
153
154 return __gb_lights_flash_intensity_set(channel, intensity);
155 }
156 #else
157 static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
158 {
159 return container_of(cdev, struct gb_channel, cled);
160 }
161
162 static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
163 {
164 return &channel->cled;
165 }
166
167 static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
168 {
169 return 0;
170 }
171 #endif
172
173 static int gb_lights_color_set(struct gb_channel *channel, u32 color);
174 static int gb_lights_fade_set(struct gb_channel *channel);
175
176 static void led_lock(struct led_classdev *cdev)
177 {
178 mutex_lock(&cdev->led_access);
179 }
180
181 static void led_unlock(struct led_classdev *cdev)
182 {
183 mutex_unlock(&cdev->led_access);
184 }
185
186 #define gb_lights_fade_attr(__dir) \
187 static ssize_t fade_##__dir##_show(struct device *dev, \
188 struct device_attribute *attr, \
189 char *buf) \
190 { \
191 struct led_classdev *cdev = dev_get_drvdata(dev); \
192 struct gb_channel *channel = get_channel_from_cdev(cdev); \
193 \
194 return sprintf(buf, "%u\n", channel->fade_##__dir); \
195 } \
196 \
197 static ssize_t fade_##__dir##_store(struct device *dev, \
198 struct device_attribute *attr, \
199 const char *buf, size_t size) \
200 { \
201 struct led_classdev *cdev = dev_get_drvdata(dev); \
202 struct gb_channel *channel = get_channel_from_cdev(cdev); \
203 u8 fade; \
204 int ret; \
205 \
206 led_lock(cdev); \
207 if (led_sysfs_is_disabled(cdev)) { \
208 ret = -EBUSY; \
209 goto unlock; \
210 } \
211 \
212 ret = kstrtou8(buf, 0, &fade); \
213 if (ret < 0) { \
214 dev_err(dev, "could not parse fade value %d\n", ret); \
215 goto unlock; \
216 } \
217 if (channel->fade_##__dir == fade) \
218 goto unlock; \
219 channel->fade_##__dir = fade; \
220 \
221 ret = gb_lights_fade_set(channel); \
222 if (ret < 0) \
223 goto unlock; \
224 \
225 ret = size; \
226 unlock: \
227 led_unlock(cdev); \
228 return ret; \
229 } \
230 static DEVICE_ATTR_RW(fade_##__dir)
231
232 gb_lights_fade_attr(in);
233 gb_lights_fade_attr(out);
234
235 static ssize_t color_show(struct device *dev, struct device_attribute *attr,
236 char *buf)
237 {
238 struct led_classdev *cdev = dev_get_drvdata(dev);
239 struct gb_channel *channel = get_channel_from_cdev(cdev);
240
241 return sprintf(buf, "0x%08x\n", channel->color);
242 }
243
244 static ssize_t color_store(struct device *dev, struct device_attribute *attr,
245 const char *buf, size_t size)
246 {
247 struct led_classdev *cdev = dev_get_drvdata(dev);
248 struct gb_channel *channel = get_channel_from_cdev(cdev);
249 u32 color;
250 int ret;
251
252 led_lock(cdev);
253 if (led_sysfs_is_disabled(cdev)) {
254 ret = -EBUSY;
255 goto unlock;
256 }
257 ret = kstrtou32(buf, 0, &color);
258 if (ret < 0) {
259 dev_err(dev, "could not parse color value %d\n", ret);
260 goto unlock;
261 }
262
263 ret = gb_lights_color_set(channel, color);
264 if (ret < 0)
265 goto unlock;
266
267 channel->color = color;
268 ret = size;
269 unlock:
270 led_unlock(cdev);
271 return ret;
272 }
273 static DEVICE_ATTR_RW(color);
274
275 static int channel_attr_groups_set(struct gb_channel *channel,
276 struct led_classdev *cdev)
277 {
278 int attr = 0;
279 int size = 0;
280
281 if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
282 size++;
283 if (channel->flags & GB_LIGHT_CHANNEL_FADER)
284 size += 2;
285
286 if (!size)
287 return 0;
288
289 /* Set attributes based in the channel flags */
290 channel->attrs = kcalloc(size + 1, sizeof(*channel->attrs), GFP_KERNEL);
291 if (!channel->attrs)
292 return -ENOMEM;
293 channel->attr_group = kcalloc(1, sizeof(*channel->attr_group),
294 GFP_KERNEL);
295 if (!channel->attr_group)
296 return -ENOMEM;
297 channel->attr_groups = kcalloc(2, sizeof(*channel->attr_groups),
298 GFP_KERNEL);
299 if (!channel->attr_groups)
300 return -ENOMEM;
301
302 if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
303 channel->attrs[attr++] = &dev_attr_color.attr;
304 if (channel->flags & GB_LIGHT_CHANNEL_FADER) {
305 channel->attrs[attr++] = &dev_attr_fade_in.attr;
306 channel->attrs[attr++] = &dev_attr_fade_out.attr;
307 }
308
309 channel->attr_group->attrs = channel->attrs;
310
311 channel->attr_groups[0] = channel->attr_group;
312
313 cdev->groups = channel->attr_groups;
314
315 return 0;
316 }
317
318 static int gb_lights_fade_set(struct gb_channel *channel)
319 {
320 struct gb_connection *connection = get_conn_from_channel(channel);
321 struct gb_bundle *bundle = connection->bundle;
322 struct gb_lights_set_fade_request req;
323 int ret;
324
325 if (channel->releasing)
326 return -ESHUTDOWN;
327
328 ret = gb_pm_runtime_get_sync(bundle);
329 if (ret < 0)
330 return ret;
331
332 req.light_id = channel->light->id;
333 req.channel_id = channel->id;
334 req.fade_in = channel->fade_in;
335 req.fade_out = channel->fade_out;
336 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FADE,
337 &req, sizeof(req), NULL, 0);
338
339 gb_pm_runtime_put_autosuspend(bundle);
340
341 return ret;
342 }
343
344 static int gb_lights_color_set(struct gb_channel *channel, u32 color)
345 {
346 struct gb_connection *connection = get_conn_from_channel(channel);
347 struct gb_bundle *bundle = connection->bundle;
348 struct gb_lights_set_color_request req;
349 int ret;
350
351 if (channel->releasing)
352 return -ESHUTDOWN;
353
354 ret = gb_pm_runtime_get_sync(bundle);
355 if (ret < 0)
356 return ret;
357
358 req.light_id = channel->light->id;
359 req.channel_id = channel->id;
360 req.color = cpu_to_le32(color);
361 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_COLOR,
362 &req, sizeof(req), NULL, 0);
363
364 gb_pm_runtime_put_autosuspend(bundle);
365
366 return ret;
367 }
368
369 static int __gb_lights_led_brightness_set(struct gb_channel *channel)
370 {
371 struct gb_lights_set_brightness_request req;
372 struct gb_connection *connection = get_conn_from_channel(channel);
373 struct gb_bundle *bundle = connection->bundle;
374 bool old_active;
375 int ret;
376
377 mutex_lock(&channel->lock);
378 ret = gb_pm_runtime_get_sync(bundle);
379 if (ret < 0)
380 goto out_unlock;
381
382 old_active = channel->active;
383
384 req.light_id = channel->light->id;
385 req.channel_id = channel->id;
386 req.brightness = (u8)channel->led->brightness;
387
388 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BRIGHTNESS,
389 &req, sizeof(req), NULL, 0);
390 if (ret < 0)
391 goto out_pm_put;
392
393 if (channel->led->brightness)
394 channel->active = true;
395 else
396 channel->active = false;
397
398 /* we need to keep module alive when turning to active state */
399 if (!old_active && channel->active)
400 goto out_unlock;
401
402 /*
403 * on the other hand if going to inactive we still hold a reference and
404 * need to put it, so we could go to suspend.
405 */
406 if (old_active && !channel->active)
407 gb_pm_runtime_put_autosuspend(bundle);
408
409 out_pm_put:
410 gb_pm_runtime_put_autosuspend(bundle);
411 out_unlock:
412 mutex_unlock(&channel->lock);
413
414 return ret;
415 }
416
417 static int __gb_lights_brightness_set(struct gb_channel *channel)
418 {
419 int ret;
420
421 if (channel->releasing)
422 return 0;
423
424 if (is_channel_flash(channel))
425 ret = __gb_lights_flash_brightness_set(channel);
426 else
427 ret = __gb_lights_led_brightness_set(channel);
428
429 return ret;
430 }
431
432 static int gb_brightness_set(struct led_classdev *cdev,
433 enum led_brightness value)
434 {
435 struct gb_channel *channel = get_channel_from_cdev(cdev);
436
437 channel->led->brightness = value;
438
439 return __gb_lights_brightness_set(channel);
440 }
441
442 static enum led_brightness gb_brightness_get(struct led_classdev *cdev)
443
444 {
445 struct gb_channel *channel = get_channel_from_cdev(cdev);
446
447 return channel->led->brightness;
448 }
449
450 static int gb_blink_set(struct led_classdev *cdev, unsigned long *delay_on,
451 unsigned long *delay_off)
452 {
453 struct gb_channel *channel = get_channel_from_cdev(cdev);
454 struct gb_connection *connection = get_conn_from_channel(channel);
455 struct gb_bundle *bundle = connection->bundle;
456 struct gb_lights_blink_request req;
457 bool old_active;
458 int ret;
459
460 if (channel->releasing)
461 return -ESHUTDOWN;
462
463 if (!delay_on || !delay_off)
464 return -EINVAL;
465
466 mutex_lock(&channel->lock);
467 ret = gb_pm_runtime_get_sync(bundle);
468 if (ret < 0)
469 goto out_unlock;
470
471 old_active = channel->active;
472
473 req.light_id = channel->light->id;
474 req.channel_id = channel->id;
475 req.time_on_ms = cpu_to_le16(*delay_on);
476 req.time_off_ms = cpu_to_le16(*delay_off);
477
478 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BLINK, &req,
479 sizeof(req), NULL, 0);
480 if (ret < 0)
481 goto out_pm_put;
482
483 if (*delay_on)
484 channel->active = true;
485 else
486 channel->active = false;
487
488 /* we need to keep module alive when turning to active state */
489 if (!old_active && channel->active)
490 goto out_unlock;
491
492 /*
493 * on the other hand if going to inactive we still hold a reference and
494 * need to put it, so we could go to suspend.
495 */
496 if (old_active && !channel->active)
497 gb_pm_runtime_put_autosuspend(bundle);
498
499 out_pm_put:
500 gb_pm_runtime_put_autosuspend(bundle);
501 out_unlock:
502 mutex_unlock(&channel->lock);
503
504 return ret;
505 }
506
507 static void gb_lights_led_operations_set(struct gb_channel *channel,
508 struct led_classdev *cdev)
509 {
510 cdev->brightness_get = gb_brightness_get;
511 cdev->brightness_set_blocking = gb_brightness_set;
512
513 if (channel->flags & GB_LIGHT_CHANNEL_BLINK)
514 cdev->blink_set = gb_blink_set;
515 }
516
517 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
518 /* V4L2 specific helpers */
519 static const struct v4l2_flash_ops v4l2_flash_ops;
520
521 static void __gb_lights_channel_v4l2_config(struct led_flash_setting *channel_s,
522 struct led_flash_setting *v4l2_s)
523 {
524 v4l2_s->min = channel_s->min;
525 v4l2_s->max = channel_s->max;
526 v4l2_s->step = channel_s->step;
527 /* For v4l2 val is the default value */
528 v4l2_s->val = channel_s->max;
529 }
530
531 static int gb_lights_light_v4l2_register(struct gb_light *light)
532 {
533 struct gb_connection *connection = get_conn_from_light(light);
534 struct device *dev = &connection->bundle->dev;
535 struct v4l2_flash_config sd_cfg = { {0} }, sd_cfg_ind = { {0} };
536 struct led_classdev_flash *fled;
537 struct led_classdev *iled = NULL;
538 struct gb_channel *channel_torch, *channel_ind, *channel_flash;
539
540 channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
541 if (channel_torch)
542 __gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
543 &sd_cfg.intensity);
544
545 channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
546 if (channel_ind) {
547 __gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
548 &sd_cfg_ind.intensity);
549 iled = &channel_ind->fled.led_cdev;
550 }
551
552 channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH);
553 WARN_ON(!channel_flash);
554
555 fled = &channel_flash->fled;
556
557 snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
558 snprintf(sd_cfg_ind.dev_name, sizeof(sd_cfg_ind.dev_name),
559 "%s indicator", light->name);
560
561 /* Set the possible values to faults, in our case all faults */
562 sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
563 LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
564 LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
565 LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
566 LED_FAULT_LED_OVER_TEMPERATURE;
567
568 light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, &v4l2_flash_ops,
569 &sd_cfg);
570 if (IS_ERR(light->v4l2_flash))
571 return PTR_ERR(light->v4l2_flash);
572
573 if (channel_ind) {
574 light->v4l2_flash_ind =
575 v4l2_flash_indicator_init(dev, NULL, iled, &sd_cfg_ind);
576 if (IS_ERR(light->v4l2_flash_ind)) {
577 v4l2_flash_release(light->v4l2_flash);
578 return PTR_ERR(light->v4l2_flash_ind);
579 }
580 }
581
582 return 0;
583 }
584
585 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
586 {
587 v4l2_flash_release(light->v4l2_flash_ind);
588 v4l2_flash_release(light->v4l2_flash);
589 }
590 #else
591 static int gb_lights_light_v4l2_register(struct gb_light *light)
592 {
593 struct gb_connection *connection = get_conn_from_light(light);
594
595 dev_err(&connection->bundle->dev, "no support for v4l2 subdevices\n");
596 return 0;
597 }
598
599 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
600 {
601 }
602 #endif
603
604 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
605 /* Flash specific operations */
606 static int gb_lights_flash_intensity_set(struct led_classdev_flash *fcdev,
607 u32 brightness)
608 {
609 struct gb_channel *channel = container_of(fcdev, struct gb_channel,
610 fled);
611 int ret;
612
613 ret = __gb_lights_flash_intensity_set(channel, brightness);
614 if (ret < 0)
615 return ret;
616
617 fcdev->brightness.val = brightness;
618
619 return 0;
620 }
621
622 static int gb_lights_flash_intensity_get(struct led_classdev_flash *fcdev,
623 u32 *brightness)
624 {
625 *brightness = fcdev->brightness.val;
626
627 return 0;
628 }
629
630 static int gb_lights_flash_strobe_set(struct led_classdev_flash *fcdev,
631 bool state)
632 {
633 struct gb_channel *channel = container_of(fcdev, struct gb_channel,
634 fled);
635 struct gb_connection *connection = get_conn_from_channel(channel);
636 struct gb_bundle *bundle = connection->bundle;
637 struct gb_lights_set_flash_strobe_request req;
638 int ret;
639
640 if (channel->releasing)
641 return -ESHUTDOWN;
642
643 ret = gb_pm_runtime_get_sync(bundle);
644 if (ret < 0)
645 return ret;
646
647 req.light_id = channel->light->id;
648 req.channel_id = channel->id;
649 req.state = state ? 1 : 0;
650
651 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_STROBE,
652 &req, sizeof(req), NULL, 0);
653 if (!ret)
654 channel->strobe_state = state;
655
656 gb_pm_runtime_put_autosuspend(bundle);
657
658 return ret;
659 }
660
661 static int gb_lights_flash_strobe_get(struct led_classdev_flash *fcdev,
662 bool *state)
663 {
664 struct gb_channel *channel = container_of(fcdev, struct gb_channel,
665 fled);
666
667 *state = channel->strobe_state;
668 return 0;
669 }
670
671 static int gb_lights_flash_timeout_set(struct led_classdev_flash *fcdev,
672 u32 timeout)
673 {
674 struct gb_channel *channel = container_of(fcdev, struct gb_channel,
675 fled);
676 struct gb_connection *connection = get_conn_from_channel(channel);
677 struct gb_bundle *bundle = connection->bundle;
678 struct gb_lights_set_flash_timeout_request req;
679 int ret;
680
681 if (channel->releasing)
682 return -ESHUTDOWN;
683
684 ret = gb_pm_runtime_get_sync(bundle);
685 if (ret < 0)
686 return ret;
687
688 req.light_id = channel->light->id;
689 req.channel_id = channel->id;
690 req.timeout_us = cpu_to_le32(timeout);
691
692 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_TIMEOUT,
693 &req, sizeof(req), NULL, 0);
694 if (!ret)
695 fcdev->timeout.val = timeout;
696
697 gb_pm_runtime_put_autosuspend(bundle);
698
699 return ret;
700 }
701
702 static int gb_lights_flash_fault_get(struct led_classdev_flash *fcdev,
703 u32 *fault)
704 {
705 struct gb_channel *channel = container_of(fcdev, struct gb_channel,
706 fled);
707 struct gb_connection *connection = get_conn_from_channel(channel);
708 struct gb_bundle *bundle = connection->bundle;
709 struct gb_lights_get_flash_fault_request req;
710 struct gb_lights_get_flash_fault_response resp;
711 int ret;
712
713 if (channel->releasing)
714 return -ESHUTDOWN;
715
716 ret = gb_pm_runtime_get_sync(bundle);
717 if (ret < 0)
718 return ret;
719
720 req.light_id = channel->light->id;
721 req.channel_id = channel->id;
722
723 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_FLASH_FAULT,
724 &req, sizeof(req), &resp, sizeof(resp));
725 if (!ret)
726 *fault = le32_to_cpu(resp.fault);
727
728 gb_pm_runtime_put_autosuspend(bundle);
729
730 return ret;
731 }
732
733 static const struct led_flash_ops gb_lights_flash_ops = {
734 .flash_brightness_set = gb_lights_flash_intensity_set,
735 .flash_brightness_get = gb_lights_flash_intensity_get,
736 .strobe_set = gb_lights_flash_strobe_set,
737 .strobe_get = gb_lights_flash_strobe_get,
738 .timeout_set = gb_lights_flash_timeout_set,
739 .fault_get = gb_lights_flash_fault_get,
740 };
741
742 static int __gb_lights_channel_torch_attach(struct gb_channel *channel,
743 struct gb_channel *channel_torch)
744 {
745 char *name;
746
747 /* we can only attach torch to a flash channel */
748 if (!(channel->mode & GB_CHANNEL_MODE_FLASH))
749 return 0;
750
751 /* Move torch brightness to the destination */
752 channel->led->max_brightness = channel_torch->led->max_brightness;
753
754 /* append mode name to flash name */
755 name = kasprintf(GFP_KERNEL, "%s_%s", channel->led->name,
756 channel_torch->mode_name);
757 if (!name)
758 return -ENOMEM;
759 kfree(channel->led->name);
760 channel->led->name = name;
761
762 channel_torch->led = channel->led;
763
764 return 0;
765 }
766
767 static int __gb_lights_flash_led_register(struct gb_channel *channel)
768 {
769 struct gb_connection *connection = get_conn_from_channel(channel);
770 struct led_classdev_flash *fled = &channel->fled;
771 struct led_flash_setting *fset;
772 struct gb_channel *channel_torch;
773 int ret;
774
775 fled->ops = &gb_lights_flash_ops;
776
777 fled->led_cdev.flags |= LED_DEV_CAP_FLASH;
778
779 fset = &fled->brightness;
780 fset->min = channel->intensity_uA.min;
781 fset->max = channel->intensity_uA.max;
782 fset->step = channel->intensity_uA.step;
783 fset->val = channel->intensity_uA.max;
784
785 /* Only the flash mode have the timeout constraints settings */
786 if (channel->mode & GB_CHANNEL_MODE_FLASH) {
787 fset = &fled->timeout;
788 fset->min = channel->timeout_us.min;
789 fset->max = channel->timeout_us.max;
790 fset->step = channel->timeout_us.step;
791 fset->val = channel->timeout_us.max;
792 }
793
794 /*
795 * If light have torch mode channel, this channel will be the led
796 * classdev of the registered above flash classdev
797 */
798 channel_torch = get_channel_from_mode(channel->light,
799 GB_CHANNEL_MODE_TORCH);
800 if (channel_torch) {
801 ret = __gb_lights_channel_torch_attach(channel, channel_torch);
802 if (ret < 0)
803 goto fail;
804 }
805
806 ret = led_classdev_flash_register(&connection->bundle->dev, fled);
807 if (ret < 0)
808 goto fail;
809
810 channel->is_registered = true;
811 return 0;
812 fail:
813 channel->led = NULL;
814 return ret;
815 }
816
817 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
818 {
819 if (!channel->is_registered)
820 return;
821
822 led_classdev_flash_unregister(&channel->fled);
823 }
824
825 static int gb_lights_channel_flash_config(struct gb_channel *channel)
826 {
827 struct gb_connection *connection = get_conn_from_channel(channel);
828 struct gb_lights_get_channel_flash_config_request req;
829 struct gb_lights_get_channel_flash_config_response conf;
830 struct led_flash_setting *fset;
831 int ret;
832
833 req.light_id = channel->light->id;
834 req.channel_id = channel->id;
835
836 ret = gb_operation_sync(connection,
837 GB_LIGHTS_TYPE_GET_CHANNEL_FLASH_CONFIG,
838 &req, sizeof(req), &conf, sizeof(conf));
839 if (ret < 0)
840 return ret;
841
842 /*
843 * Intensity constraints for flash related modes: flash, torch,
844 * indicator. They will be needed for v4l2 registration.
845 */
846 fset = &channel->intensity_uA;
847 fset->min = le32_to_cpu(conf.intensity_min_uA);
848 fset->max = le32_to_cpu(conf.intensity_max_uA);
849 fset->step = le32_to_cpu(conf.intensity_step_uA);
850
851 /*
852 * On flash type, max brightness is set as the number of intensity steps
853 * available.
854 */
855 channel->led->max_brightness = (fset->max - fset->min) / fset->step;
856
857 /* Only the flash mode have the timeout constraints settings */
858 if (channel->mode & GB_CHANNEL_MODE_FLASH) {
859 fset = &channel->timeout_us;
860 fset->min = le32_to_cpu(conf.timeout_min_us);
861 fset->max = le32_to_cpu(conf.timeout_max_us);
862 fset->step = le32_to_cpu(conf.timeout_step_us);
863 }
864
865 return 0;
866 }
867 #else
868 static int gb_lights_channel_flash_config(struct gb_channel *channel)
869 {
870 struct gb_connection *connection = get_conn_from_channel(channel);
871
872 dev_err(&connection->bundle->dev, "no support for flash devices\n");
873 return 0;
874 }
875
876 static int __gb_lights_flash_led_register(struct gb_channel *channel)
877 {
878 return 0;
879 }
880
881 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
882 {
883 }
884
885 #endif
886
887 static int __gb_lights_led_register(struct gb_channel *channel)
888 {
889 struct gb_connection *connection = get_conn_from_channel(channel);
890 struct led_classdev *cdev = get_channel_cdev(channel);
891 int ret;
892
893 ret = led_classdev_register(&connection->bundle->dev, cdev);
894 if (ret < 0)
895 channel->led = NULL;
896 else
897 channel->is_registered = true;
898 return ret;
899 }
900
901 static int gb_lights_channel_register(struct gb_channel *channel)
902 {
903 /* Normal LED channel, just register in led classdev and we are done */
904 if (!is_channel_flash(channel))
905 return __gb_lights_led_register(channel);
906
907 /*
908 * Flash Type need more work, register flash classdev, indicator as
909 * flash classdev, torch will be led classdev of the flash classdev.
910 */
911 if (!(channel->mode & GB_CHANNEL_MODE_TORCH))
912 return __gb_lights_flash_led_register(channel);
913
914 return 0;
915 }
916
917 static void __gb_lights_led_unregister(struct gb_channel *channel)
918 {
919 struct led_classdev *cdev = get_channel_cdev(channel);
920
921 if (!channel->is_registered)
922 return;
923
924 led_classdev_unregister(cdev);
925 kfree(cdev->name);
926 cdev->name = NULL;
927 channel->led = NULL;
928 }
929
930 static void gb_lights_channel_unregister(struct gb_channel *channel)
931 {
932 /* The same as register, handle channels differently */
933 if (!is_channel_flash(channel)) {
934 __gb_lights_led_unregister(channel);
935 return;
936 }
937
938 if (channel->mode & GB_CHANNEL_MODE_TORCH)
939 __gb_lights_led_unregister(channel);
940 else
941 __gb_lights_flash_led_unregister(channel);
942 }
943
944 static int gb_lights_channel_config(struct gb_light *light,
945 struct gb_channel *channel)
946 {
947 struct gb_lights_get_channel_config_response conf;
948 struct gb_lights_get_channel_config_request req;
949 struct gb_connection *connection = get_conn_from_light(light);
950 struct led_classdev *cdev = get_channel_cdev(channel);
951 char *name;
952 int ret;
953
954 req.light_id = light->id;
955 req.channel_id = channel->id;
956
957 ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_CHANNEL_CONFIG,
958 &req, sizeof(req), &conf, sizeof(conf));
959 if (ret < 0)
960 return ret;
961
962 channel->light = light;
963 channel->mode = le32_to_cpu(conf.mode);
964 channel->flags = le32_to_cpu(conf.flags);
965 channel->color = le32_to_cpu(conf.color);
966 channel->color_name = kstrndup(conf.color_name, NAMES_MAX, GFP_KERNEL);
967 if (!channel->color_name)
968 return -ENOMEM;
969 channel->mode_name = kstrndup(conf.mode_name, NAMES_MAX, GFP_KERNEL);
970 if (!channel->mode_name)
971 return -ENOMEM;
972
973 channel->led = cdev;
974
975 name = kasprintf(GFP_KERNEL, "%s:%s:%s", light->name,
976 channel->color_name, channel->mode_name);
977 if (!name)
978 return -ENOMEM;
979
980 cdev->name = name;
981
982 cdev->max_brightness = conf.max_brightness;
983
984 ret = channel_attr_groups_set(channel, cdev);
985 if (ret < 0)
986 return ret;
987
988 gb_lights_led_operations_set(channel, cdev);
989
990 /*
991 * If it is not a flash related channel (flash, torch or indicator) we
992 * are done here. If not, continue and fetch flash related
993 * configurations.
994 */
995 if (!is_channel_flash(channel))
996 return ret;
997
998 light->has_flash = true;
999
1000 return gb_lights_channel_flash_config(channel);
1001 }
1002
1003 static int gb_lights_light_config(struct gb_lights *glights, u8 id)
1004 {
1005 struct gb_light *light = &glights->lights[id];
1006 struct gb_lights_get_light_config_request req;
1007 struct gb_lights_get_light_config_response conf;
1008 int ret;
1009 int i;
1010
1011 light->glights = glights;
1012 light->id = id;
1013
1014 req.id = id;
1015
1016 ret = gb_operation_sync(glights->connection,
1017 GB_LIGHTS_TYPE_GET_LIGHT_CONFIG,
1018 &req, sizeof(req), &conf, sizeof(conf));
1019 if (ret < 0)
1020 return ret;
1021
1022 if (!conf.channel_count)
1023 return -EINVAL;
1024 if (!strlen(conf.name))
1025 return -EINVAL;
1026
1027 light->channels_count = conf.channel_count;
1028 light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL);
1029
1030 light->channels = kcalloc(light->channels_count,
1031 sizeof(struct gb_channel), GFP_KERNEL);
1032 if (!light->channels)
1033 return -ENOMEM;
1034
1035 /* First we collect all the configurations for all channels */
1036 for (i = 0; i < light->channels_count; i++) {
1037 light->channels[i].id = i;
1038 ret = gb_lights_channel_config(light, &light->channels[i]);
1039 if (ret < 0)
1040 return ret;
1041 }
1042
1043 return 0;
1044 }
1045
1046 static int gb_lights_light_register(struct gb_light *light)
1047 {
1048 int ret;
1049 int i;
1050
1051 /*
1052 * Then, if everything went ok in getting configurations, we register
1053 * the classdev, flash classdev and v4l2 subsystem, if a flash device is
1054 * found.
1055 */
1056 for (i = 0; i < light->channels_count; i++) {
1057 ret = gb_lights_channel_register(&light->channels[i]);
1058 if (ret < 0)
1059 return ret;
1060
1061 mutex_init(&light->channels[i].lock);
1062 }
1063
1064 light->ready = true;
1065
1066 if (light->has_flash) {
1067 ret = gb_lights_light_v4l2_register(light);
1068 if (ret < 0) {
1069 light->has_flash = false;
1070 return ret;
1071 }
1072 }
1073
1074 return 0;
1075 }
1076
1077 static void gb_lights_channel_free(struct gb_channel *channel)
1078 {
1079 kfree(channel->attrs);
1080 kfree(channel->attr_group);
1081 kfree(channel->attr_groups);
1082 kfree(channel->color_name);
1083 kfree(channel->mode_name);
1084 mutex_destroy(&channel->lock);
1085 }
1086
1087 static void gb_lights_channel_release(struct gb_channel *channel)
1088 {
1089 channel->releasing = true;
1090
1091 gb_lights_channel_unregister(channel);
1092
1093 gb_lights_channel_free(channel);
1094 }
1095
1096 static void gb_lights_light_release(struct gb_light *light)
1097 {
1098 int i;
1099
1100 light->ready = false;
1101
1102 if (light->has_flash)
1103 gb_lights_light_v4l2_unregister(light);
1104 light->has_flash = false;
1105
1106 for (i = 0; i < light->channels_count; i++)
1107 gb_lights_channel_release(&light->channels[i]);
1108 light->channels_count = 0;
1109
1110 kfree(light->channels);
1111 light->channels = NULL;
1112 kfree(light->name);
1113 light->name = NULL;
1114 }
1115
1116 static void gb_lights_release(struct gb_lights *glights)
1117 {
1118 int i;
1119
1120 if (!glights)
1121 return;
1122
1123 mutex_lock(&glights->lights_lock);
1124 if (!glights->lights)
1125 goto free_glights;
1126
1127 for (i = 0; i < glights->lights_count; i++)
1128 gb_lights_light_release(&glights->lights[i]);
1129
1130 kfree(glights->lights);
1131
1132 free_glights:
1133 mutex_unlock(&glights->lights_lock);
1134 mutex_destroy(&glights->lights_lock);
1135 kfree(glights);
1136 }
1137
1138 static int gb_lights_get_count(struct gb_lights *glights)
1139 {
1140 struct gb_lights_get_lights_response resp;
1141 int ret;
1142
1143 ret = gb_operation_sync(glights->connection, GB_LIGHTS_TYPE_GET_LIGHTS,
1144 NULL, 0, &resp, sizeof(resp));
1145 if (ret < 0)
1146 return ret;
1147
1148 if (!resp.lights_count)
1149 return -EINVAL;
1150
1151 glights->lights_count = resp.lights_count;
1152
1153 return 0;
1154 }
1155
1156 static int gb_lights_create_all(struct gb_lights *glights)
1157 {
1158 struct gb_connection *connection = glights->connection;
1159 int ret;
1160 int i;
1161
1162 mutex_lock(&glights->lights_lock);
1163 ret = gb_lights_get_count(glights);
1164 if (ret < 0)
1165 goto out;
1166
1167 glights->lights = kcalloc(glights->lights_count,
1168 sizeof(struct gb_light), GFP_KERNEL);
1169 if (!glights->lights) {
1170 ret = -ENOMEM;
1171 goto out;
1172 }
1173
1174 for (i = 0; i < glights->lights_count; i++) {
1175 ret = gb_lights_light_config(glights, i);
1176 if (ret < 0) {
1177 dev_err(&connection->bundle->dev,
1178 "Fail to configure lights device\n");
1179 goto out;
1180 }
1181 }
1182
1183 out:
1184 mutex_unlock(&glights->lights_lock);
1185 return ret;
1186 }
1187
1188 static int gb_lights_register_all(struct gb_lights *glights)
1189 {
1190 struct gb_connection *connection = glights->connection;
1191 int ret = 0;
1192 int i;
1193
1194 mutex_lock(&glights->lights_lock);
1195 for (i = 0; i < glights->lights_count; i++) {
1196 ret = gb_lights_light_register(&glights->lights[i]);
1197 if (ret < 0) {
1198 dev_err(&connection->bundle->dev,
1199 "Fail to enable lights device\n");
1200 break;
1201 }
1202 }
1203
1204 mutex_unlock(&glights->lights_lock);
1205 return ret;
1206 }
1207
1208 static int gb_lights_request_handler(struct gb_operation *op)
1209 {
1210 struct gb_connection *connection = op->connection;
1211 struct device *dev = &connection->bundle->dev;
1212 struct gb_lights *glights = gb_connection_get_data(connection);
1213 struct gb_light *light;
1214 struct gb_message *request;
1215 struct gb_lights_event_request *payload;
1216 int ret = 0;
1217 u8 light_id;
1218 u8 event;
1219
1220 if (op->type != GB_LIGHTS_TYPE_EVENT) {
1221 dev_err(dev, "Unsupported unsolicited event: %u\n", op->type);
1222 return -EINVAL;
1223 }
1224
1225 request = op->request;
1226
1227 if (request->payload_size < sizeof(*payload)) {
1228 dev_err(dev, "Wrong event size received (%zu < %zu)\n",
1229 request->payload_size, sizeof(*payload));
1230 return -EINVAL;
1231 }
1232
1233 payload = request->payload;
1234 light_id = payload->light_id;
1235
1236 if (light_id >= glights->lights_count ||
1237 !glights->lights[light_id].ready) {
1238 dev_err(dev, "Event received for unconfigured light id: %d\n",
1239 light_id);
1240 return -EINVAL;
1241 }
1242
1243 event = payload->event;
1244
1245 if (event & GB_LIGHTS_LIGHT_CONFIG) {
1246 light = &glights->lights[light_id];
1247
1248 mutex_lock(&glights->lights_lock);
1249 gb_lights_light_release(light);
1250 ret = gb_lights_light_config(glights, light_id);
1251 if (!ret)
1252 ret = gb_lights_light_register(light);
1253 if (ret < 0)
1254 gb_lights_light_release(light);
1255 mutex_unlock(&glights->lights_lock);
1256 }
1257
1258 return ret;
1259 }
1260
1261 static int gb_lights_probe(struct gb_bundle *bundle,
1262 const struct greybus_bundle_id *id)
1263 {
1264 struct greybus_descriptor_cport *cport_desc;
1265 struct gb_connection *connection;
1266 struct gb_lights *glights;
1267 int ret;
1268
1269 if (bundle->num_cports != 1)
1270 return -ENODEV;
1271
1272 cport_desc = &bundle->cport_desc[0];
1273 if (cport_desc->protocol_id != GREYBUS_PROTOCOL_LIGHTS)
1274 return -ENODEV;
1275
1276 glights = kzalloc(sizeof(*glights), GFP_KERNEL);
1277 if (!glights)
1278 return -ENOMEM;
1279
1280 mutex_init(&glights->lights_lock);
1281
1282 connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
1283 gb_lights_request_handler);
1284 if (IS_ERR(connection)) {
1285 ret = PTR_ERR(connection);
1286 goto out;
1287 }
1288
1289 glights->connection = connection;
1290 gb_connection_set_data(connection, glights);
1291
1292 greybus_set_drvdata(bundle, glights);
1293
1294 /* We aren't ready to receive an incoming request yet */
1295 ret = gb_connection_enable_tx(connection);
1296 if (ret)
1297 goto error_connection_destroy;
1298
1299 /*
1300 * Setup all the lights devices over this connection, if anything goes
1301 * wrong tear down all lights
1302 */
1303 ret = gb_lights_create_all(glights);
1304 if (ret < 0)
1305 goto error_connection_disable;
1306
1307 /* We are ready to receive an incoming request now, enable RX as well */
1308 ret = gb_connection_enable(connection);
1309 if (ret)
1310 goto error_connection_disable;
1311
1312 /* Enable & register lights */
1313 ret = gb_lights_register_all(glights);
1314 if (ret < 0)
1315 goto error_connection_disable;
1316
1317 gb_pm_runtime_put_autosuspend(bundle);
1318
1319 return 0;
1320
1321 error_connection_disable:
1322 gb_connection_disable(connection);
1323 error_connection_destroy:
1324 gb_connection_destroy(connection);
1325 out:
1326 gb_lights_release(glights);
1327 return ret;
1328 }
1329
1330 static void gb_lights_disconnect(struct gb_bundle *bundle)
1331 {
1332 struct gb_lights *glights = greybus_get_drvdata(bundle);
1333
1334 if (gb_pm_runtime_get_sync(bundle))
1335 gb_pm_runtime_get_noresume(bundle);
1336
1337 gb_connection_disable(glights->connection);
1338 gb_connection_destroy(glights->connection);
1339
1340 gb_lights_release(glights);
1341 }
1342
1343 static const struct greybus_bundle_id gb_lights_id_table[] = {
1344 { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LIGHTS) },
1345 { }
1346 };
1347 MODULE_DEVICE_TABLE(greybus, gb_lights_id_table);
1348
1349 static struct greybus_driver gb_lights_driver = {
1350 .name = "lights",
1351 .probe = gb_lights_probe,
1352 .disconnect = gb_lights_disconnect,
1353 .id_table = gb_lights_id_table,
1354 };
1355 module_greybus_driver(gb_lights_driver);
1356
1357 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support