1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
|
/*
* LED Flash class driver for the AAT1290
* 1.5A Step-Up Current Regulator for Flash LEDs
*
* Copyright (C) 2015, Samsung Electronics Co., Ltd.
* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/led-class-flash.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <media/v4l2-flash-led-class.h>
#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17
#define AAT1290_MAX_MM_CURR_PERCENT_0 16
#define AAT1290_MAX_MM_CURR_PERCENT_100 1
#define AAT1290_FLASH_SAFETY_TIMER_ADDR 18
#define AAT1290_MOVIE_MODE_CONFIG_ADDR 19
#define AAT1290_MOVIE_MODE_OFF 1
#define AAT1290_MOVIE_MODE_ON 3
#define AAT1290_MM_CURRENT_RATIO_ADDR 20
#define AAT1290_MM_TO_FL_1_92 1
#define AAT1290_MM_TO_FL_RATIO 1000 / 1920
#define AAT1290_MAX_MM_CURRENT(fl_max) (fl_max * AAT1290_MM_TO_FL_RATIO)
#define AAT1290_LATCH_TIME_MIN_US 500
#define AAT1290_LATCH_TIME_MAX_US 1000
#define AAT1290_EN_SET_TICK_TIME_US 1
#define AAT1290_FLEN_OFF_DELAY_TIME_US 10
#define AAT1290_FLASH_TM_NUM_LEVELS 16
#define AAT1290_MM_CURRENT_SCALE_SIZE 15
struct aat1290_led_config_data {
/* maximum LED current in movie mode */
u32 max_mm_current;
/* maximum LED current in flash mode */
u32 max_flash_current;
/* maximum flash timeout */
u32 max_flash_tm;
/* external strobe capability */
bool has_external_strobe;
/* max LED brightness level */
enum led_brightness max_brightness;
};
struct aat1290_led {
/* platform device data */
struct platform_device *pdev;
/* secures access to the device */
struct mutex lock;
/* corresponding LED Flash class device */
struct led_classdev_flash fled_cdev;
/* V4L2 Flash device */
struct v4l2_flash *v4l2_flash;
/* FLEN pin */
struct gpio_desc *gpio_fl_en;
/* EN|SET pin */
struct gpio_desc *gpio_en_set;
/* movie mode current scale */
int *mm_current_scale;
/* device mode */
bool movie_mode;
/* brightness cache */
unsigned int torch_brightness;
};
static struct aat1290_led *fled_cdev_to_led(
struct led_classdev_flash *fled_cdev)
{
return container_of(fled_cdev, struct aat1290_led, fled_cdev);
}
static struct led_classdev_flash *led_cdev_to_fled_cdev(
struct led_classdev *led_cdev)
{
return container_of(led_cdev, struct led_classdev_flash, led_cdev);
}
static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)
{
int i;
gpiod_direction_output(led->gpio_fl_en, 0);
gpiod_direction_output(led->gpio_en_set, 0);
udelay(AAT1290_FLEN_OFF_DELAY_TIME_US);
/* write address */
for (i = 0; i < addr; ++i) {
udelay(AAT1290_EN_SET_TICK_TIME_US);
gpiod_direction_output(led->gpio_en_set, 0);
udelay(AAT1290_EN_SET_TICK_TIME_US);
gpiod_direction_output(led->gpio_en_set, 1);
}
usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);
/* write data */
for (i = 0; i < value; ++i) {
udelay(AAT1290_EN_SET_TICK_TIME_US);
gpiod_direction_output(led->gpio_en_set, 0);
udelay(AAT1290_EN_SET_TICK_TIME_US);
gpiod_direction_output(led->gpio_en_set, 1);
}
usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);
}
static void aat1290_set_flash_safety_timer(struct aat1290_led *led,
unsigned int micro_sec)
{
struct led_classdev_flash *fled_cdev = &led->fled_cdev;
struct led_flash_setting *flash_tm = &fled_cdev->timeout;
int flash_tm_reg = AAT1290_FLASH_TM_NUM_LEVELS -
(micro_sec / flash_tm->step) + 1;
aat1290_as2cwire_write(led, AAT1290_FLASH_SAFETY_TIMER_ADDR,
flash_tm_reg);
}
/* LED subsystem callbacks */
static int aat1290_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct led_classdev_flash *fled_cdev = led_cdev_to_fled_cdev(led_cdev);
struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
mutex_lock(&led->lock);
if (brightness == 0) {
gpiod_direction_output(led->gpio_fl_en, 0);
gpiod_direction_output(led->gpio_en_set, 0);
led->movie_mode = false;
} else {
if (!led->movie_mode) {
aat1290_as2cwire_write(led,
AAT1290_MM_CURRENT_RATIO_ADDR,
AAT1290_MM_TO_FL_1_92);
led->movie_mode = true;
}
aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CURRENT_ADDR,
AAT1290_MAX_MM_CURR_PERCENT_0 - brightness);
aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CONFIG_ADDR,
AAT1290_MOVIE_MODE_ON);
}
mutex_unlock(&led->lock);
return 0;
}
static int aat1290_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
bool state)
{
struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
struct led_classdev *led_cdev = &fled_cdev->led_cdev;
struct led_flash_setting *timeout = &fled_cdev->timeout;
mutex_lock(&led->lock);
if (state) {
aat1290_set_flash_safety_timer(led, timeout->val);
gpiod_direction_output(led->gpio_fl_en, 1);
} else {
gpiod_direction_output(led->gpio_fl_en, 0);
gpiod_direction_output(led->gpio_en_set, 0);
}
/*
* To reenter movie mode after a flash event the part must be cycled
* off and back on to reset the movie mode and reprogrammed via the
* AS2Cwire. Therefore the brightness and movie_mode properties needs
* to be updated here to reflect the actual state.
*/
led_cdev->brightness = 0;
led->movie_mode = false;
mutex_unlock(&led->lock);
return 0;
}
static int aat1290_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
u32 timeout)
{
/*
* Don't do anything - flash timeout is cached in the led-class-flash
* core and will be applied in the strobe_set op, as writing the
* safety timer register spuriously turns the torch mode on.
*/
return 0;
}
static int aat1290_led_parse_dt(struct aat1290_led *led,
struct aat1290_led_config_data *cfg,
struct device_node **sub_node)
{
struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
struct device *dev = &led->pdev->dev;
struct device_node *child_node;
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
struct pinctrl *pinctrl;
#endif
int ret = 0;
led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);
if (IS_ERR(led->gpio_fl_en)) {
ret = PTR_ERR(led->gpio_fl_en);
dev_err(dev, "Unable to claim gpio \"flen\".\n");
return ret;
}
led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);
if (IS_ERR(led->gpio_en_set)) {
ret = PTR_ERR(led->gpio_en_set);
dev_err(dev, "Unable to claim gpio \"enset\".\n");
return ret;
}
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
if (IS_ERR(pinctrl)) {
cfg->has_external_strobe = false;
dev_info(dev,
"No support for external strobe detected.\n");
} else {
cfg->has_external_strobe = true;
}
#endif
child_node = of_get_next_available_child(dev->of_node, NULL);
if (!child_node) {
dev_err(dev, "No DT child node found for connected LED.\n");
return -EINVAL;
}
led_cdev->name = of_get_property(child_node, "label", NULL) ? :
child_node->name;
ret = of_property_read_u32(child_node, "led-max-microamp",
&cfg->max_mm_current);
/*
* led-max-microamp will default to 1/20 of flash-max-microamp
* in case it is missing.
*/
if (ret < 0)
dev_warn(dev,
"led-max-microamp DT property missing\n"
|