1 /*
2 * V4L2 flash LED sub-device registration helpers.
3 *
4 * Copyright (C) 2015 Samsung Electronics Co., Ltd
5 * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/led-class-flash.h>
13 #include <linux/module.h>
14 #include <linux/mutex.h>
15 #include <linux/property.h>
16 #include <linux/slab.h>
17 #include <linux/types.h>
18 #include <media/v4l2-flash-led-class.h>
19
20 #define has_flash_op(v4l2_flash, op) \
21 (v4l2_flash && v4l2_flash->ops && v4l2_flash->ops->op)
22
23 #define call_flash_op(v4l2_flash, op, arg) \
24 (has_flash_op(v4l2_flash, op) ? \
25 v4l2_flash->ops->op(v4l2_flash, arg) : \
26 -EINVAL)
27
28 enum ctrl_init_data_id {
29 LED_MODE,
30 TORCH_INTENSITY,
31 FLASH_INTENSITY,
32 INDICATOR_INTENSITY,
33 FLASH_TIMEOUT,
34 STROBE_SOURCE,
35 /*
36 * Only above values are applicable to
37 * the 'ctrls' array in the struct v4l2_flash.
38 */
39 FLASH_STROBE,
40 STROBE_STOP,
41 STROBE_STATUS,
42 FLASH_FAULT,
43 NUM_FLASH_CTRLS,
44 };
45
__intensity_to_led_brightness(struct v4l2_ctrl * ctrl,s32 intensity)46 static enum led_brightness __intensity_to_led_brightness(
47 struct v4l2_ctrl *ctrl, s32 intensity)
48 {
49 intensity -= ctrl->minimum;
50 intensity /= (u32) ctrl->step;
51
52 /*
53 * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
54 * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
55 * Therefore it must be possible to set it to 0 level which in
56 * the LED subsystem reflects LED_OFF state.
57 */
58 if (ctrl->minimum)
59 ++intensity;
60
61 return intensity;
62 }
63
__led_brightness_to_intensity(struct v4l2_ctrl * ctrl,enum led_brightness brightness)64 static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl,
65 enum led_brightness brightness)
66 {
67 /*
68 * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
69 * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
70 * Do not decrement brightness read from the LED subsystem for
71 * indicator LED as it may equal 0. For torch LEDs this function
72 * is called only when V4L2_FLASH_LED_MODE_TORCH is set and the
73 * brightness read is guaranteed to be greater than 0. In the mode
74 * V4L2_FLASH_LED_MODE_NONE the cached torch intensity value is used.
75 */
76 if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY)
77 --brightness;
78
79 return (brightness * ctrl->step) + ctrl->minimum;
80 }
81
v4l2_flash_set_led_brightness(struct v4l2_flash * v4l2_flash,struct v4l2_ctrl * ctrl)82 static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
83 struct v4l2_ctrl *ctrl)
84 {
85 struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
86 enum led_brightness brightness;
87
88 if (has_flash_op(v4l2_flash, intensity_to_led_brightness))
89 brightness = call_flash_op(v4l2_flash,
90 intensity_to_led_brightness,
91 ctrl->val);
92 else
93 brightness = __intensity_to_led_brightness(ctrl, ctrl->val);
94 /*
95 * In case a LED Flash class driver provides ops for custom
96 * brightness <-> intensity conversion, it also must have defined
97 * related v4l2 control step == 1. In such a case a backward conversion
98 * from led brightness to v4l2 intensity is required to find out the
99 * the aligned intensity value.
100 */
101 if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
102 ctrl->val = call_flash_op(v4l2_flash,
103 led_brightness_to_intensity,
104 brightness);
105
106 if (ctrl == ctrls[TORCH_INTENSITY]) {
107 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
108 return;
109
110 led_set_brightness_sync(&v4l2_flash->fled_cdev->led_cdev,
111 brightness);
112 } else {
113 led_set_brightness_sync(v4l2_flash->iled_cdev,
114 brightness);
115 }
116 }
117
v4l2_flash_update_led_brightness(struct v4l2_flash * v4l2_flash,struct v4l2_ctrl * ctrl)118 static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash,
119 struct v4l2_ctrl *ctrl)
120 {
121 struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
122 struct led_classdev *led_cdev;
123 int ret;
124
125 if (ctrl == ctrls[TORCH_INTENSITY]) {
126 /*
127 * Update torch brightness only if in TORCH_MODE. In other modes
128 * torch led is turned off, which would spuriously inform the
129 * user space that V4L2_CID_FLASH_TORCH_INTENSITY control value
130 * has changed to 0.
131 */
132 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
133 return 0;
134 led_cdev = &v4l2_flash->fled_cdev->led_cdev;
135 } else {
136 led_cdev = v4l2_flash->iled_cdev;
137 }
138
139 ret = led_update_brightness(led_cdev);
140 if (ret < 0)
141 return ret;
142
143 if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
144 ctrl->val = call_flash_op(v4l2_flash,
145 led_brightness_to_intensity,
146 led_cdev->brightness);
147 else
148 ctrl->val = __led_brightness_to_intensity(ctrl,
149 led_cdev->brightness);
150
151 return 0;
152 }
153
v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl * c)154 static int v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl *c)
155 {
156 struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
157 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
158 bool is_strobing;
159 int ret;
160
161 switch (c->id) {
162 case V4L2_CID_FLASH_TORCH_INTENSITY:
163 case V4L2_CID_FLASH_INDICATOR_INTENSITY:
164 return v4l2_flash_update_led_brightness(v4l2_flash, c);
165 case V4L2_CID_FLASH_INTENSITY:
166 ret = led_update_flash_brightness(fled_cdev);
167 if (ret < 0)
168 return ret;
169 /*
170 * No conversion is needed as LED Flash class also uses
171 * microamperes for flash intensity units.
172 */
173 c->val = fled_cdev->brightness.val;
174 return 0;
175 case V4L2_CID_FLASH_STROBE_STATUS:
176 ret = led_get_flash_strobe(fled_cdev, &is_strobing);
177 if (ret < 0)
178 return ret;
179 c->val = is_strobing;
180 return 0;
181 case V4L2_CID_FLASH_FAULT:
182 /* LED faults map directly to V4L2 flash faults */
183 return led_get_flash_fault(fled_cdev, &c->val);
184 default:
185 return -EINVAL;
186 }
187 }
188
__software_strobe_mode_inactive(struct v4l2_ctrl ** ctrls)189 static bool __software_strobe_mode_inactive(struct v4l2_ctrl **ctrls)
190 {
191 return ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) ||
192 (ctrls[STROBE_SOURCE] && (ctrls[STROBE_SOURCE]->val !=
193 V4L2_FLASH_STROBE_SOURCE_SOFTWARE)));
194 }
195
v4l2_flash_s_ctrl(struct v4l2_ctrl * c)196 static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
197 {
198 struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
199 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
200 struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
201 struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
202 bool external_strobe;
203 int ret = 0;
204
205 switch (c->id) {
206 case V4L2_CID_FLASH_LED_MODE:
207 switch (c->val) {
208 case V4L2_FLASH_LED_MODE_NONE:
209 led_set_brightness_sync(led_cdev, LED_OFF);
210 return led_set_flash_strobe(fled_cdev, false);
211 case V4L2_FLASH_LED_MODE_FLASH:
212 /* Turn the torch LED off */
213 led_set_brightness_sync(led_cdev, LED_OFF);
214 if (ctrls[STROBE_SOURCE]) {
215 external_strobe = (ctrls[STROBE_SOURCE]->val ==
216 V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
217
218 ret = call_flash_op(v4l2_flash,
219 external_strobe_set,
220 external_strobe);
221 }
222 return ret;
223 case V4L2_FLASH_LED_MODE_TORCH:
224 if (ctrls[STROBE_SOURCE]) {
225 ret = call_flash_op(v4l2_flash,
226 external_strobe_set,
227 false);
228 if (ret < 0)
229 return ret;
230 }
231 /* Stop flash strobing */
232 ret = led_set_flash_strobe(fled_cdev, false);
233 if (ret < 0)
234 return ret;
235
236 v4l2_flash_set_led_brightness(v4l2_flash,
237 ctrls[TORCH_INTENSITY]);
238 return 0;
239 }
240 break;
241 case V4L2_CID_FLASH_STROBE_SOURCE:
242 external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
243 /*
244 * For some hardware arrangements setting strobe source may
245 * affect torch mode. Therefore, if not in the flash mode,
246 * cache only this setting. It will be applied upon switching
247 * to flash mode.
248 */
249 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH)
250 return 0;
251
252 return call_flash_op(v4l2_flash, external_strobe_set,
253 external_strobe);
254 case V4L2_CID_FLASH_STROBE:
255 if (__software_strobe_mode_inactive(ctrls))
256 return -EBUSY;
257 return led_set_flash_strobe(fled_cdev, true);
258 case V4L2_CID_FLASH_STROBE_STOP:
259 if (__software_strobe_mode_inactive(ctrls))
260 return -EBUSY;
261 return led_set_flash_strobe(fled_cdev, false);
262 case V4L2_CID_FLASH_TIMEOUT:
263 /*
264 * No conversion is needed as LED Flash class also uses
265 * microseconds for flash timeout units.
266 */
267 return led_set_flash_timeout(fled_cdev, c->val);
268 case V4L2_CID_FLASH_INTENSITY:
269 /*
270 * No conversion is needed as LED Flash class also uses
271 * microamperes for flash intensity units.
272 */
273 return led_set_flash_brightness(fled_cdev, c->val);
274 case V4L2_CID_FLASH_TORCH_INTENSITY:
275 case V4L2_CID_FLASH_INDICATOR_INTENSITY:
276 v4l2_flash_set_led_brightness(v4l2_flash, c);
277 return 0;
278 }
279
280 return -EINVAL;
281 }
282
283 static const struct v4l2_ctrl_ops v4l2_flash_ctrl_ops = {
284 .g_volatile_ctrl = v4l2_flash_g_volatile_ctrl,
285 .s_ctrl = v4l2_flash_s_ctrl,
286 };
287
__lfs_to_v4l2_ctrl_config(struct led_flash_setting * s,struct v4l2_ctrl_config * c)288 static void __lfs_to_v4l2_ctrl_config(struct led_flash_setting *s,
289 struct v4l2_ctrl_config *c)
290 {
291 c->min = s->min;
292 c->max = s->max;
293 c->step = s->step;
294 c->def = s->val;
295 }
296
__fill_ctrl_init_data(struct v4l2_flash * v4l2_flash,struct v4l2_flash_config * flash_cfg,struct v4l2_flash_ctrl_data * ctrl_init_data)297 static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
298 struct v4l2_flash_config *flash_cfg,
299 struct v4l2_flash_ctrl_data *ctrl_init_data)
300 {
301 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
302 struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
303 struct v4l2_ctrl_config *ctrl_cfg;
304 u32 mask;
305
306 /* Init INDICATOR_INTENSITY ctrl data */
307 if (v4l2_flash->iled_cdev) {
308 ctrl_init_data[INDICATOR_INTENSITY].cid =
309 V4L2_CID_FLASH_INDICATOR_INTENSITY;
310 ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
311 __lfs_to_v4l2_ctrl_config(&flash_cfg->intensity,
312 ctrl_cfg);
313 ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
314 ctrl_cfg->min = 0;
315 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
316 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
317 }
318
319 if (!led_cdev || WARN_ON(!(led_cdev->flags & LED_DEV_CAP_FLASH)))
320 return;
321
322 /* Init FLASH_FAULT ctrl data */
323 if (flash_cfg->flash_faults) {
324 ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
325 ctrl_cfg = &ctrl_init_data[FLASH_FAULT].config;
326 ctrl_cfg->id = V4L2_CID_FLASH_FAULT;
327 ctrl_cfg->max = flash_cfg->flash_faults;
328 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
329 V4L2_CTRL_FLAG_READ_ONLY;
330 }
331
332 /* Init FLASH_LED_MODE ctrl data */
333 mask = 1 << V4L2_FLASH_LED_MODE_NONE |
334 1 << V4L2_FLASH_LED_MODE_TORCH;
335 if (led_cdev->flags & LED_DEV_CAP_FLASH)
336 mask |= 1 << V4L2_FLASH_LED_MODE_FLASH;
337
338 ctrl_init_data[LED_MODE].cid = V4L2_CID_FLASH_LED_MODE;
339 ctrl_cfg = &ctrl_init_data[LED_MODE].config;
340 ctrl_cfg->id = V4L2_CID_FLASH_LED_MODE;
341 ctrl_cfg->max = V4L2_FLASH_LED_MODE_TORCH;
342 ctrl_cfg->menu_skip_mask = ~mask;
343 ctrl_cfg->def = V4L2_FLASH_LED_MODE_NONE;
344 ctrl_cfg->flags = 0;
345
346 /* Init TORCH_INTENSITY ctrl data */
347 ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
348 ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
349 __lfs_to_v4l2_ctrl_config(&flash_cfg->intensity, ctrl_cfg);
350 ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
351 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
352 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
353
354 /* Init FLASH_STROBE ctrl data */
355 ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
356 ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
357 ctrl_cfg->id = V4L2_CID_FLASH_STROBE;
358
359 /* Init STROBE_STOP ctrl data */
360 ctrl_init_data[STROBE_STOP].cid = V4L2_CID_FLASH_STROBE_STOP;
361 ctrl_cfg = &ctrl_init_data[STROBE_STOP].config;
362 ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STOP;
363
364 /* Init FLASH_STROBE_SOURCE ctrl data */
365 if (flash_cfg->has_external_strobe) {
366 mask = (1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE) |
367 (1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
368 ctrl_init_data[STROBE_SOURCE].cid =
369 V4L2_CID_FLASH_STROBE_SOURCE;
370 ctrl_cfg = &ctrl_init_data[STROBE_SOURCE].config;
371 ctrl_cfg->id = V4L2_CID_FLASH_STROBE_SOURCE;
372 ctrl_cfg->max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
373 ctrl_cfg->menu_skip_mask = ~mask;
374 ctrl_cfg->def = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
375 }
376
377 /* Init STROBE_STATUS ctrl data */
378 if (has_flash_op(fled_cdev, strobe_get)) {
379 ctrl_init_data[STROBE_STATUS].cid =
380 V4L2_CID_FLASH_STROBE_STATUS;
381 ctrl_cfg = &ctrl_init_data[STROBE_STATUS].config;
382 ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STATUS;
383 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
384 V4L2_CTRL_FLAG_READ_ONLY;
385 }
386
387 /* Init FLASH_TIMEOUT ctrl data */
388 if (has_flash_op(fled_cdev, timeout_set)) {
389 ctrl_init_data[FLASH_TIMEOUT].cid = V4L2_CID_FLASH_TIMEOUT;
390 ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config;
391 __lfs_to_v4l2_ctrl_config(&fled_cdev->timeout, ctrl_cfg);
392 ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT;
393 }
394
395 /* Init FLASH_INTENSITY ctrl data */
396 if (has_flash_op(fled_cdev, flash_brightness_set)) {
397 ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY;
398 ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config;
399 __lfs_to_v4l2_ctrl_config(&fled_cdev->brightness, ctrl_cfg);
400 ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY;
401 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
402 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
403 }
404 }
405
v4l2_flash_init_controls(struct v4l2_flash * v4l2_flash,struct v4l2_flash_config * flash_cfg)406 static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash,
407 struct v4l2_flash_config *flash_cfg)
408
409 {
410 struct v4l2_flash_ctrl_data *ctrl_init_data;
411 struct v4l2_ctrl *ctrl;
412 struct v4l2_ctrl_config *ctrl_cfg;
413 int i, ret, num_ctrls = 0;
414
415 v4l2_flash->ctrls = devm_kzalloc(v4l2_flash->sd.dev,
416 sizeof(*v4l2_flash->ctrls) *
417 (STROBE_SOURCE + 1), GFP_KERNEL);
418 if (!v4l2_flash->ctrls)
419 return -ENOMEM;
420
421 /* allocate memory dynamically so as not to exceed stack frame size */
422 ctrl_init_data = kcalloc(NUM_FLASH_CTRLS, sizeof(*ctrl_init_data),
423 GFP_KERNEL);
424 if (!ctrl_init_data)
425 return -ENOMEM;
426
427 __fill_ctrl_init_data(v4l2_flash, flash_cfg, ctrl_init_data);
428
429 for (i = 0; i < NUM_FLASH_CTRLS; ++i)
430 if (ctrl_init_data[i].cid)
431 ++num_ctrls;
432
433 v4l2_ctrl_handler_init(&v4l2_flash->hdl, num_ctrls);
434
435 for (i = 0; i < NUM_FLASH_CTRLS; ++i) {
436 ctrl_cfg = &ctrl_init_data[i].config;
437 if (!ctrl_init_data[i].cid)
438 continue;
439
440 if (ctrl_cfg->id == V4L2_CID_FLASH_LED_MODE ||
441 ctrl_cfg->id == V4L2_CID_FLASH_STROBE_SOURCE)
442 ctrl = v4l2_ctrl_new_std_menu(&v4l2_flash->hdl,
443 &v4l2_flash_ctrl_ops,
444 ctrl_cfg->id,
445 ctrl_cfg->max,
446 ctrl_cfg->menu_skip_mask,
447 ctrl_cfg->def);
448 else
449 ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
450 &v4l2_flash_ctrl_ops,
451 ctrl_cfg->id,
452 ctrl_cfg->min,
453 ctrl_cfg->max,
454 ctrl_cfg->step,
455 ctrl_cfg->def);
456
457 if (ctrl)
458 ctrl->flags |= ctrl_cfg->flags;
459
460 if (i <= STROBE_SOURCE)
461 v4l2_flash->ctrls[i] = ctrl;
462 }
463
464 kfree(ctrl_init_data);
465
466 if (v4l2_flash->hdl.error) {
467 ret = v4l2_flash->hdl.error;
468 goto error_free_handler;
469 }
470
471 v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
472
473 v4l2_flash->sd.ctrl_handler = &v4l2_flash->hdl;
474
475 return 0;
476
477 error_free_handler:
478 v4l2_ctrl_handler_free(&v4l2_flash->hdl);
479 return ret;
480 }
481
__sync_device_with_v4l2_controls(struct v4l2_flash * v4l2_flash)482 static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
483 {
484 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
485 struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
486 int ret = 0;
487
488 if (ctrls[TORCH_INTENSITY])
489 v4l2_flash_set_led_brightness(v4l2_flash,
490 ctrls[TORCH_INTENSITY]);
491
492 if (ctrls[INDICATOR_INTENSITY])
493 v4l2_flash_set_led_brightness(v4l2_flash,
494 ctrls[INDICATOR_INTENSITY]);
495
496 if (ctrls[FLASH_TIMEOUT]) {
497 ret = led_set_flash_timeout(fled_cdev,
498 ctrls[FLASH_TIMEOUT]->val);
499 if (ret < 0)
500 return ret;
501 }
502
503 if (ctrls[FLASH_INTENSITY]) {
504 ret = led_set_flash_brightness(fled_cdev,
505 ctrls[FLASH_INTENSITY]->val);
506 if (ret < 0)
507 return ret;
508 }
509
510 /*
511 * For some hardware arrangements setting strobe source may affect
512 * torch mode. Synchronize strobe source setting only if not in torch
513 * mode. For torch mode case it will get synchronized upon switching
514 * to flash mode.
515 */
516 if (ctrls[STROBE_SOURCE] &&
517 ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
518 ret = call_flash_op(v4l2_flash, external_strobe_set,
519 ctrls[STROBE_SOURCE]->val);
520
521 return ret;
522 }
523
524 /*
525 * V4L2 subdev internal operations
526 */
527
v4l2_flash_open(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)528 static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
529 {
530 struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
531 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
532 struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
533 struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
534 int ret = 0;
535
536 if (!v4l2_fh_is_singular(&fh->vfh))
537 return 0;
538
539 if (led_cdev) {
540 mutex_lock(&led_cdev->led_access);
541
542 led_sysfs_disable(led_cdev);
543 led_trigger_remove(led_cdev);
544
545 mutex_unlock(&led_cdev->led_access);
546 }
547
548 if (led_cdev_ind) {
549 mutex_lock(&led_cdev_ind->led_access);
550
551 led_sysfs_disable(led_cdev_ind);
552 led_trigger_remove(led_cdev_ind);
553
554 mutex_unlock(&led_cdev_ind->led_access);
555 }
556
557 ret = __sync_device_with_v4l2_controls(v4l2_flash);
558 if (ret < 0)
559 goto out_sync_device;
560
561 return 0;
562 out_sync_device:
563 if (led_cdev) {
564 mutex_lock(&led_cdev->led_access);
565 led_sysfs_enable(led_cdev);
566 mutex_unlock(&led_cdev->led_access);
567 }
568
569 if (led_cdev_ind) {
570 mutex_lock(&led_cdev_ind->led_access);
571 led_sysfs_enable(led_cdev_ind);
572 mutex_unlock(&led_cdev_ind->led_access);
573 }
574
575 return ret;
576 }
577
v4l2_flash_close(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)578 static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
579 {
580 struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
581 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
582 struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
583 struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
584 int ret = 0;
585
586 if (!v4l2_fh_is_singular(&fh->vfh))
587 return 0;
588
589 if (led_cdev) {
590 mutex_lock(&led_cdev->led_access);
591
592 if (v4l2_flash->ctrls[STROBE_SOURCE])
593 ret = v4l2_ctrl_s_ctrl(
594 v4l2_flash->ctrls[STROBE_SOURCE],
595 V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
596 led_sysfs_enable(led_cdev);
597
598 mutex_unlock(&led_cdev->led_access);
599 }
600
601 if (led_cdev_ind) {
602 mutex_lock(&led_cdev_ind->led_access);
603 led_sysfs_enable(led_cdev_ind);
604 mutex_unlock(&led_cdev_ind->led_access);
605 }
606
607 return ret;
608 }
609
610 static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
611 .open = v4l2_flash_open,
612 .close = v4l2_flash_close,
613 };
614
615 static const struct v4l2_subdev_ops v4l2_flash_subdev_ops;
616
__v4l2_flash_init(struct device * dev,struct fwnode_handle * fwn,struct led_classdev_flash * fled_cdev,struct led_classdev * iled_cdev,const struct v4l2_flash_ops * ops,struct v4l2_flash_config * config)617 static struct v4l2_flash *__v4l2_flash_init(
618 struct device *dev, struct fwnode_handle *fwn,
619 struct led_classdev_flash *fled_cdev, struct led_classdev *iled_cdev,
620 const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config)
621 {
622 struct v4l2_flash *v4l2_flash;
623 struct v4l2_subdev *sd;
624 int ret;
625
626 if (!config)
627 return ERR_PTR(-EINVAL);
628
629 v4l2_flash = devm_kzalloc(dev, sizeof(*v4l2_flash), GFP_KERNEL);
630 if (!v4l2_flash)
631 return ERR_PTR(-ENOMEM);
632
633 sd = &v4l2_flash->sd;
634 v4l2_flash->fled_cdev = fled_cdev;
635 v4l2_flash->iled_cdev = iled_cdev;
636 v4l2_flash->ops = ops;
637 sd->dev = dev;
638 sd->fwnode = fwn ? fwn : dev_fwnode(dev);
639 v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
640 sd->internal_ops = &v4l2_flash_subdev_internal_ops;
641 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
642 strlcpy(sd->name, config->dev_name, sizeof(sd->name));
643
644 ret = media_entity_pads_init(&sd->entity, 0, NULL);
645 if (ret < 0)
646 return ERR_PTR(ret);
647
648 sd->entity.function = MEDIA_ENT_F_FLASH;
649
650 ret = v4l2_flash_init_controls(v4l2_flash, config);
651 if (ret < 0)
652 goto err_init_controls;
653
654 fwnode_handle_get(sd->fwnode);
655
656 ret = v4l2_async_register_subdev(sd);
657 if (ret < 0)
658 goto err_async_register_sd;
659
660 return v4l2_flash;
661
662 err_async_register_sd:
663 fwnode_handle_put(sd->fwnode);
664 v4l2_ctrl_handler_free(sd->ctrl_handler);
665 err_init_controls:
666 media_entity_cleanup(&sd->entity);
667
668 return ERR_PTR(ret);
669 }
670
v4l2_flash_init(struct device * dev,struct fwnode_handle * fwn,struct led_classdev_flash * fled_cdev,const struct v4l2_flash_ops * ops,struct v4l2_flash_config * config)671 struct v4l2_flash *v4l2_flash_init(
672 struct device *dev, struct fwnode_handle *fwn,
673 struct led_classdev_flash *fled_cdev,
674 const struct v4l2_flash_ops *ops,
675 struct v4l2_flash_config *config)
676 {
677 return __v4l2_flash_init(dev, fwn, fled_cdev, NULL, ops, config);
678 }
679 EXPORT_SYMBOL_GPL(v4l2_flash_init);
680
v4l2_flash_indicator_init(struct device * dev,struct fwnode_handle * fwn,struct led_classdev * iled_cdev,struct v4l2_flash_config * config)681 struct v4l2_flash *v4l2_flash_indicator_init(
682 struct device *dev, struct fwnode_handle *fwn,
683 struct led_classdev *iled_cdev,
684 struct v4l2_flash_config *config)
685 {
686 return __v4l2_flash_init(dev, fwn, NULL, iled_cdev, NULL, config);
687 }
688 EXPORT_SYMBOL_GPL(v4l2_flash_indicator_init);
689
v4l2_flash_release(struct v4l2_flash * v4l2_flash)690 void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
691 {
692 struct v4l2_subdev *sd;
693
694 if (IS_ERR_OR_NULL(v4l2_flash))
695 return;
696
697 sd = &v4l2_flash->sd;
698
699 v4l2_async_unregister_subdev(sd);
700
701 fwnode_handle_put(sd->fwnode);
702
703 v4l2_ctrl_handler_free(sd->ctrl_handler);
704 media_entity_cleanup(&sd->entity);
705 }
706 EXPORT_SYMBOL_GPL(v4l2_flash_release);
707
708 MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
709 MODULE_DESCRIPTION("V4L2 Flash sub-device helpers");
710 MODULE_LICENSE("GPL v2");
711