1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * LED flash driver for LM3554
4 *
5 * Copyright (c) 2010-2012 Intel Corporation. All Rights Reserved.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 *
17 */
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/mutex.h>
21 #include <linux/delay.h>
22 #include <linux/gpio/consumer.h>
23 #include <linux/slab.h>
24
25 #include "../include/media/lm3554.h"
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-device.h>
28 #include <linux/acpi.h>
29 #include "../include/linux/atomisp_gmin_platform.h"
30 #include "../include/linux/atomisp.h"
31
32 /* Registers */
33
34 #define LM3554_TORCH_BRIGHTNESS_REG 0xA0
35 #define LM3554_TORCH_MODE_SHIFT 0
36 #define LM3554_TORCH_CURRENT_SHIFT 3
37 #define LM3554_INDICATOR_CURRENT_SHIFT 6
38
39 #define LM3554_FLASH_BRIGHTNESS_REG 0xB0
40 #define LM3554_FLASH_MODE_SHIFT 0
41 #define LM3554_FLASH_CURRENT_SHIFT 3
42 #define LM3554_STROBE_SENSITIVITY_SHIFT 7
43
44 #define LM3554_FLASH_DURATION_REG 0xC0
45 #define LM3554_FLASH_TIMEOUT_SHIFT 0
46 #define LM3554_CURRENT_LIMIT_SHIFT 5
47
48 #define LM3554_FLAGS_REG 0xD0
49 #define LM3554_FLAG_TIMEOUT BIT(0)
50 #define LM3554_FLAG_THERMAL_SHUTDOWN BIT(1)
51 #define LM3554_FLAG_LED_FAULT BIT(2)
52 #define LM3554_FLAG_TX1_INTERRUPT BIT(3)
53 #define LM3554_FLAG_TX2_INTERRUPT BIT(4)
54 #define LM3554_FLAG_LED_THERMAL_FAULT BIT(5)
55 #define LM3554_FLAG_UNUSED BIT(6)
56 #define LM3554_FLAG_INPUT_VOLTAGE_LOW BIT(7)
57
58 #define LM3554_CONFIG_REG_1 0xE0
59 #define LM3554_ENVM_TX2_SHIFT 5
60 #define LM3554_TX2_POLARITY_SHIFT 6
61
62 struct lm3554 {
63 struct v4l2_subdev sd;
64
65 struct mutex power_lock;
66 struct v4l2_ctrl_handler ctrl_handler;
67 int power_count;
68
69 unsigned int mode;
70 int timeout;
71 u8 torch_current;
72 u8 indicator_current;
73 u8 flash_current;
74
75 struct timer_list flash_off_delay;
76 struct lm3554_platform_data *pdata;
77 };
78
79 #define to_lm3554(p_sd) container_of(p_sd, struct lm3554, sd)
80
81 /* Return negative errno else zero on success */
lm3554_write(struct lm3554 * flash,u8 addr,u8 val)82 static int lm3554_write(struct lm3554 *flash, u8 addr, u8 val)
83 {
84 struct i2c_client *client = v4l2_get_subdevdata(&flash->sd);
85 int ret;
86
87 ret = i2c_smbus_write_byte_data(client, addr, val);
88
89 dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
90 ret < 0 ? "fail" : "ok");
91
92 return ret;
93 }
94
95 /* Return negative errno else a data byte received from the device. */
lm3554_read(struct lm3554 * flash,u8 addr)96 static int lm3554_read(struct lm3554 *flash, u8 addr)
97 {
98 struct i2c_client *client = v4l2_get_subdevdata(&flash->sd);
99 int ret;
100
101 ret = i2c_smbus_read_byte_data(client, addr);
102
103 dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, ret,
104 ret < 0 ? "fail" : "ok");
105
106 return ret;
107 }
108
109 /* -----------------------------------------------------------------------------
110 * Hardware configuration
111 */
112
lm3554_set_mode(struct lm3554 * flash,unsigned int mode)113 static int lm3554_set_mode(struct lm3554 *flash, unsigned int mode)
114 {
115 u8 val;
116 int ret;
117
118 val = (mode << LM3554_FLASH_MODE_SHIFT) |
119 (flash->flash_current << LM3554_FLASH_CURRENT_SHIFT);
120
121 ret = lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, val);
122 if (ret == 0)
123 flash->mode = mode;
124 return ret;
125 }
126
lm3554_set_torch(struct lm3554 * flash)127 static int lm3554_set_torch(struct lm3554 *flash)
128 {
129 u8 val;
130
131 val = (flash->mode << LM3554_TORCH_MODE_SHIFT) |
132 (flash->torch_current << LM3554_TORCH_CURRENT_SHIFT) |
133 (flash->indicator_current << LM3554_INDICATOR_CURRENT_SHIFT);
134
135 return lm3554_write(flash, LM3554_TORCH_BRIGHTNESS_REG, val);
136 }
137
lm3554_set_flash(struct lm3554 * flash)138 static int lm3554_set_flash(struct lm3554 *flash)
139 {
140 u8 val;
141
142 val = (flash->mode << LM3554_FLASH_MODE_SHIFT) |
143 (flash->flash_current << LM3554_FLASH_CURRENT_SHIFT);
144
145 return lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, val);
146 }
147
lm3554_set_duration(struct lm3554 * flash)148 static int lm3554_set_duration(struct lm3554 *flash)
149 {
150 u8 val;
151
152 val = (flash->timeout << LM3554_FLASH_TIMEOUT_SHIFT) |
153 (flash->pdata->current_limit << LM3554_CURRENT_LIMIT_SHIFT);
154
155 return lm3554_write(flash, LM3554_FLASH_DURATION_REG, val);
156 }
157
lm3554_set_config1(struct lm3554 * flash)158 static int lm3554_set_config1(struct lm3554 *flash)
159 {
160 u8 val;
161
162 val = (flash->pdata->envm_tx2 << LM3554_ENVM_TX2_SHIFT) |
163 (flash->pdata->tx2_polarity << LM3554_TX2_POLARITY_SHIFT);
164 return lm3554_write(flash, LM3554_CONFIG_REG_1, val);
165 }
166
167 /* -----------------------------------------------------------------------------
168 * Hardware trigger
169 */
lm3554_flash_off_delay(struct timer_list * t)170 static void lm3554_flash_off_delay(struct timer_list *t)
171 {
172 struct lm3554 *flash = from_timer(flash, t, flash_off_delay);
173 struct lm3554_platform_data *pdata = flash->pdata;
174
175 gpiod_set_value(pdata->gpio_strobe, 0);
176 }
177
lm3554_hw_strobe(struct i2c_client * client,bool strobe)178 static int lm3554_hw_strobe(struct i2c_client *client, bool strobe)
179 {
180 int ret, timer_pending;
181 struct v4l2_subdev *sd = i2c_get_clientdata(client);
182 struct lm3554 *flash = to_lm3554(sd);
183 struct lm3554_platform_data *pdata = flash->pdata;
184
185 /*
186 * An abnormal high flash current is observed when strobe off the
187 * flash. Workaround here is firstly set flash current to lower level,
188 * wait a short moment, and then strobe off the flash.
189 */
190
191 timer_pending = del_timer_sync(&flash->flash_off_delay);
192
193 /* Flash off */
194 if (!strobe) {
195 /* set current to 70mA and wait a while */
196 ret = lm3554_write(flash, LM3554_FLASH_BRIGHTNESS_REG, 0);
197 if (ret < 0)
198 goto err;
199 mod_timer(&flash->flash_off_delay,
200 jiffies + msecs_to_jiffies(LM3554_TIMER_DELAY));
201 return 0;
202 }
203
204 /* Flash on */
205
206 /*
207 * If timer is killed before run, flash is not strobe off,
208 * so must strobe off here
209 */
210 if (timer_pending)
211 gpiod_set_value(pdata->gpio_strobe, 0);
212
213 /* Restore flash current settings */
214 ret = lm3554_set_flash(flash);
215 if (ret < 0)
216 goto err;
217
218 /* Strobe on Flash */
219 gpiod_set_value(pdata->gpio_strobe, 1);
220
221 return 0;
222 err:
223 dev_err(&client->dev, "failed to %s flash strobe (%d)\n",
224 strobe ? "on" : "off", ret);
225 return ret;
226 }
227
228 /* -----------------------------------------------------------------------------
229 * V4L2 controls
230 */
231
lm3554_read_status(struct lm3554 * flash)232 static int lm3554_read_status(struct lm3554 *flash)
233 {
234 int ret;
235 struct i2c_client *client = v4l2_get_subdevdata(&flash->sd);
236
237 /* NOTE: reading register clear fault status */
238 ret = lm3554_read(flash, LM3554_FLAGS_REG);
239 if (ret < 0)
240 return ret;
241
242 /*
243 * Accordingly to datasheet we read back '1' in bit 6.
244 * Clear it first.
245 */
246 ret &= ~LM3554_FLAG_UNUSED;
247
248 /*
249 * Do not take TX1/TX2 signal as an error
250 * because MSIC will not turn off flash, but turn to
251 * torch mode according to gsm modem signal by hardware.
252 */
253 ret &= ~(LM3554_FLAG_TX1_INTERRUPT | LM3554_FLAG_TX2_INTERRUPT);
254
255 if (ret > 0)
256 dev_dbg(&client->dev, "LM3554 flag status: %02x\n", ret);
257
258 return ret;
259 }
260
lm3554_s_flash_timeout(struct v4l2_subdev * sd,u32 val)261 static int lm3554_s_flash_timeout(struct v4l2_subdev *sd, u32 val)
262 {
263 struct lm3554 *flash = to_lm3554(sd);
264
265 val = clamp(val, LM3554_MIN_TIMEOUT, LM3554_MAX_TIMEOUT);
266 val = val / LM3554_TIMEOUT_STEPSIZE - 1;
267
268 flash->timeout = val;
269
270 return lm3554_set_duration(flash);
271 }
272
lm3554_g_flash_timeout(struct v4l2_subdev * sd,s32 * val)273 static int lm3554_g_flash_timeout(struct v4l2_subdev *sd, s32 *val)
274 {
275 struct lm3554 *flash = to_lm3554(sd);
276
277 *val = (u32)(flash->timeout + 1) * LM3554_TIMEOUT_STEPSIZE;
278
279 return 0;
280 }
281
lm3554_s_flash_intensity(struct v4l2_subdev * sd,u32 intensity)282 static int lm3554_s_flash_intensity(struct v4l2_subdev *sd, u32 intensity)
283 {
284 struct lm3554 *flash = to_lm3554(sd);
285
286 intensity = LM3554_CLAMP_PERCENTAGE(intensity);
287 intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_FLASH_STEP);
288
289 flash->flash_current = intensity;
290
291 return lm3554_set_flash(flash);
292 }
293
lm3554_g_flash_intensity(struct v4l2_subdev * sd,s32 * val)294 static int lm3554_g_flash_intensity(struct v4l2_subdev *sd, s32 *val)
295 {
296 struct lm3554 *flash = to_lm3554(sd);
297
298 *val = LM3554_VALUE_TO_PERCENT((u32)flash->flash_current,
299 LM3554_FLASH_STEP);
300
301 return 0;
302 }
303
lm3554_s_torch_intensity(struct v4l2_subdev * sd,u32 intensity)304 static int lm3554_s_torch_intensity(struct v4l2_subdev *sd, u32 intensity)
305 {
306 struct lm3554 *flash = to_lm3554(sd);
307
308 intensity = LM3554_CLAMP_PERCENTAGE(intensity);
309 intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_TORCH_STEP);
310
311 flash->torch_current = intensity;
312
313 return lm3554_set_torch(flash);
314 }
315
lm3554_g_torch_intensity(struct v4l2_subdev * sd,s32 * val)316 static int lm3554_g_torch_intensity(struct v4l2_subdev *sd, s32 *val)
317 {
318 struct lm3554 *flash = to_lm3554(sd);
319
320 *val = LM3554_VALUE_TO_PERCENT((u32)flash->torch_current,
321 LM3554_TORCH_STEP);
322
323 return 0;
324 }
325
lm3554_s_indicator_intensity(struct v4l2_subdev * sd,u32 intensity)326 static int lm3554_s_indicator_intensity(struct v4l2_subdev *sd, u32 intensity)
327 {
328 struct lm3554 *flash = to_lm3554(sd);
329
330 intensity = LM3554_CLAMP_PERCENTAGE(intensity);
331 intensity = LM3554_PERCENT_TO_VALUE(intensity, LM3554_INDICATOR_STEP);
332
333 flash->indicator_current = intensity;
334
335 return lm3554_set_torch(flash);
336 }
337
lm3554_g_indicator_intensity(struct v4l2_subdev * sd,s32 * val)338 static int lm3554_g_indicator_intensity(struct v4l2_subdev *sd, s32 *val)
339 {
340 struct lm3554 *flash = to_lm3554(sd);
341
342 *val = LM3554_VALUE_TO_PERCENT((u32)flash->indicator_current,
343 LM3554_INDICATOR_STEP);
344
345 return 0;
346 }
347
lm3554_s_flash_strobe(struct v4l2_subdev * sd,u32 val)348 static int lm3554_s_flash_strobe(struct v4l2_subdev *sd, u32 val)
349 {
350 struct i2c_client *client = v4l2_get_subdevdata(sd);
351
352 return lm3554_hw_strobe(client, val);
353 }
354
lm3554_s_flash_mode(struct v4l2_subdev * sd,u32 new_mode)355 static int lm3554_s_flash_mode(struct v4l2_subdev *sd, u32 new_mode)
356 {
357 struct lm3554 *flash = to_lm3554(sd);
358 unsigned int mode;
359
360 switch (new_mode) {
361 case ATOMISP_FLASH_MODE_OFF:
362 mode = LM3554_MODE_SHUTDOWN;
363 break;
364 case ATOMISP_FLASH_MODE_FLASH:
365 mode = LM3554_MODE_FLASH;
366 break;
367 case ATOMISP_FLASH_MODE_INDICATOR:
368 mode = LM3554_MODE_INDICATOR;
369 break;
370 case ATOMISP_FLASH_MODE_TORCH:
371 mode = LM3554_MODE_TORCH;
372 break;
373 default:
374 return -EINVAL;
375 }
376
377 return lm3554_set_mode(flash, mode);
378 }
379
lm3554_g_flash_mode(struct v4l2_subdev * sd,s32 * val)380 static int lm3554_g_flash_mode(struct v4l2_subdev *sd, s32 *val)
381 {
382 struct lm3554 *flash = to_lm3554(sd);
383 *val = flash->mode;
384 return 0;
385 }
386
lm3554_g_flash_status(struct v4l2_subdev * sd,s32 * val)387 static int lm3554_g_flash_status(struct v4l2_subdev *sd, s32 *val)
388 {
389 struct lm3554 *flash = to_lm3554(sd);
390 int value;
391
392 value = lm3554_read_status(flash);
393 if (value < 0)
394 return value;
395
396 if (value & LM3554_FLAG_TIMEOUT)
397 *val = ATOMISP_FLASH_STATUS_TIMEOUT;
398 else if (value > 0)
399 *val = ATOMISP_FLASH_STATUS_HW_ERROR;
400 else
401 *val = ATOMISP_FLASH_STATUS_OK;
402
403 return 0;
404 }
405
lm3554_g_flash_status_register(struct v4l2_subdev * sd,s32 * val)406 static int lm3554_g_flash_status_register(struct v4l2_subdev *sd, s32 *val)
407 {
408 struct lm3554 *flash = to_lm3554(sd);
409 int ret;
410
411 ret = lm3554_read(flash, LM3554_FLAGS_REG);
412
413 if (ret < 0)
414 return ret;
415
416 *val = ret;
417 return 0;
418 }
419
lm3554_s_ctrl(struct v4l2_ctrl * ctrl)420 static int lm3554_s_ctrl(struct v4l2_ctrl *ctrl)
421 {
422 struct lm3554 *dev =
423 container_of(ctrl->handler, struct lm3554, ctrl_handler);
424 int ret = 0;
425
426 switch (ctrl->id) {
427 case V4L2_CID_FLASH_TIMEOUT:
428 ret = lm3554_s_flash_timeout(&dev->sd, ctrl->val);
429 break;
430 case V4L2_CID_FLASH_INTENSITY:
431 ret = lm3554_s_flash_intensity(&dev->sd, ctrl->val);
432 break;
433 case V4L2_CID_FLASH_TORCH_INTENSITY:
434 ret = lm3554_s_torch_intensity(&dev->sd, ctrl->val);
435 break;
436 case V4L2_CID_FLASH_INDICATOR_INTENSITY:
437 ret = lm3554_s_indicator_intensity(&dev->sd, ctrl->val);
438 break;
439 case V4L2_CID_FLASH_STROBE:
440 ret = lm3554_s_flash_strobe(&dev->sd, ctrl->val);
441 break;
442 case V4L2_CID_FLASH_MODE:
443 ret = lm3554_s_flash_mode(&dev->sd, ctrl->val);
444 break;
445 default:
446 ret = -EINVAL;
447 }
448 return ret;
449 }
450
lm3554_g_volatile_ctrl(struct v4l2_ctrl * ctrl)451 static int lm3554_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
452 {
453 struct lm3554 *dev =
454 container_of(ctrl->handler, struct lm3554, ctrl_handler);
455 int ret = 0;
456
457 switch (ctrl->id) {
458 case V4L2_CID_FLASH_TIMEOUT:
459 ret = lm3554_g_flash_timeout(&dev->sd, &ctrl->val);
460 break;
461 case V4L2_CID_FLASH_INTENSITY:
462 ret = lm3554_g_flash_intensity(&dev->sd, &ctrl->val);
463 break;
464 case V4L2_CID_FLASH_TORCH_INTENSITY:
465 ret = lm3554_g_torch_intensity(&dev->sd, &ctrl->val);
466 break;
467 case V4L2_CID_FLASH_INDICATOR_INTENSITY:
468 ret = lm3554_g_indicator_intensity(&dev->sd, &ctrl->val);
469 break;
470 case V4L2_CID_FLASH_MODE:
471 ret = lm3554_g_flash_mode(&dev->sd, &ctrl->val);
472 break;
473 case V4L2_CID_FLASH_STATUS:
474 ret = lm3554_g_flash_status(&dev->sd, &ctrl->val);
475 break;
476 case V4L2_CID_FLASH_STATUS_REGISTER:
477 ret = lm3554_g_flash_status_register(&dev->sd, &ctrl->val);
478 break;
479 default:
480 ret = -EINVAL;
481 }
482
483 return ret;
484 }
485
486 static const struct v4l2_ctrl_ops ctrl_ops = {
487 .s_ctrl = lm3554_s_ctrl,
488 .g_volatile_ctrl = lm3554_g_volatile_ctrl
489 };
490
491 static const struct v4l2_ctrl_config lm3554_controls[] = {
492 {
493 .ops = &ctrl_ops,
494 .id = V4L2_CID_FLASH_TIMEOUT,
495 .type = V4L2_CTRL_TYPE_INTEGER,
496 .name = "Flash Timeout",
497 .min = 0x0,
498 .max = LM3554_MAX_TIMEOUT,
499 .step = 0x01,
500 .def = LM3554_DEFAULT_TIMEOUT,
501 .flags = 0,
502 },
503 {
504 .ops = &ctrl_ops,
505 .id = V4L2_CID_FLASH_INTENSITY,
506 .type = V4L2_CTRL_TYPE_INTEGER,
507 .name = "Flash Intensity",
508 .min = LM3554_MIN_PERCENT,
509 .max = LM3554_MAX_PERCENT,
510 .step = 0x01,
511 .def = LM3554_FLASH_DEFAULT_BRIGHTNESS,
512 .flags = 0,
513 },
514 {
515 .ops = &ctrl_ops,
516 .id = V4L2_CID_FLASH_TORCH_INTENSITY,
517 .type = V4L2_CTRL_TYPE_INTEGER,
518 .name = "Torch Intensity",
519 .min = LM3554_MIN_PERCENT,
520 .max = LM3554_MAX_PERCENT,
521 .step = 0x01,
522 .def = LM3554_TORCH_DEFAULT_BRIGHTNESS,
523 .flags = 0,
524 },
525 {
526 .ops = &ctrl_ops,
527 .id = V4L2_CID_FLASH_INDICATOR_INTENSITY,
528 .type = V4L2_CTRL_TYPE_INTEGER,
529 .name = "Indicator Intensity",
530 .min = LM3554_MIN_PERCENT,
531 .max = LM3554_MAX_PERCENT,
532 .step = 0x01,
533 .def = LM3554_INDICATOR_DEFAULT_BRIGHTNESS,
534 .flags = 0,
535 },
536 {
537 .ops = &ctrl_ops,
538 .id = V4L2_CID_FLASH_STROBE,
539 .type = V4L2_CTRL_TYPE_BOOLEAN,
540 .name = "Flash Strobe",
541 .min = 0,
542 .max = 1,
543 .step = 1,
544 .def = 0,
545 .flags = 0,
546 },
547 {
548 .ops = &ctrl_ops,
549 .id = V4L2_CID_FLASH_MODE,
550 .type = V4L2_CTRL_TYPE_INTEGER,
551 .name = "Flash Mode",
552 .min = 0,
553 .max = 100,
554 .step = 1,
555 .def = ATOMISP_FLASH_MODE_OFF,
556 .flags = 0,
557 },
558 {
559 .ops = &ctrl_ops,
560 .id = V4L2_CID_FLASH_STATUS,
561 .type = V4L2_CTRL_TYPE_INTEGER,
562 .name = "Flash Status",
563 .min = ATOMISP_FLASH_STATUS_OK,
564 .max = ATOMISP_FLASH_STATUS_TIMEOUT,
565 .step = 1,
566 .def = ATOMISP_FLASH_STATUS_OK,
567 .flags = 0,
568 },
569 {
570 .ops = &ctrl_ops,
571 .id = V4L2_CID_FLASH_STATUS_REGISTER,
572 .type = V4L2_CTRL_TYPE_INTEGER,
573 .name = "Flash Status Register",
574 .min = 0,
575 .max = 255,
576 .step = 1,
577 .def = 0,
578 .flags = 0,
579 },
580 };
581
582 /* -----------------------------------------------------------------------------
583 * V4L2 subdev core operations
584 */
585
586 /* Put device into known state. */
lm3554_setup(struct lm3554 * flash)587 static int lm3554_setup(struct lm3554 *flash)
588 {
589 struct i2c_client *client = v4l2_get_subdevdata(&flash->sd);
590 int ret;
591
592 /* clear the flags register */
593 ret = lm3554_read(flash, LM3554_FLAGS_REG);
594 if (ret < 0)
595 return ret;
596
597 dev_dbg(&client->dev, "Fault info: %02x\n", ret);
598
599 ret = lm3554_set_config1(flash);
600 if (ret < 0)
601 return ret;
602
603 ret = lm3554_set_duration(flash);
604 if (ret < 0)
605 return ret;
606
607 ret = lm3554_set_torch(flash);
608 if (ret < 0)
609 return ret;
610
611 ret = lm3554_set_flash(flash);
612 if (ret < 0)
613 return ret;
614
615 /* read status */
616 ret = lm3554_read_status(flash);
617 if (ret < 0)
618 return ret;
619
620 return ret ? -EIO : 0;
621 }
622
__lm3554_s_power(struct lm3554 * flash,int power)623 static int __lm3554_s_power(struct lm3554 *flash, int power)
624 {
625 struct lm3554_platform_data *pdata = flash->pdata;
626 int ret;
627
628 /*initialize flash driver*/
629 gpiod_set_value(pdata->gpio_reset, power);
630 usleep_range(100, 100 + 1);
631
632 if (power) {
633 /* Setup default values. This makes sure that the chip
634 * is in a known state.
635 */
636 ret = lm3554_setup(flash);
637 if (ret < 0) {
638 __lm3554_s_power(flash, 0);
639 return ret;
640 }
641 }
642
643 return 0;
644 }
645
lm3554_s_power(struct v4l2_subdev * sd,int power)646 static int lm3554_s_power(struct v4l2_subdev *sd, int power)
647 {
648 struct lm3554 *flash = to_lm3554(sd);
649 int ret = 0;
650
651 mutex_lock(&flash->power_lock);
652
653 if (flash->power_count == !power) {
654 ret = __lm3554_s_power(flash, !!power);
655 if (ret < 0)
656 goto done;
657 }
658
659 flash->power_count += power ? 1 : -1;
660 WARN_ON(flash->power_count < 0);
661
662 done:
663 mutex_unlock(&flash->power_lock);
664 return ret;
665 }
666
667 static const struct v4l2_subdev_core_ops lm3554_core_ops = {
668 .s_power = lm3554_s_power,
669 };
670
671 static const struct v4l2_subdev_ops lm3554_ops = {
672 .core = &lm3554_core_ops,
673 };
674
lm3554_detect(struct v4l2_subdev * sd)675 static int lm3554_detect(struct v4l2_subdev *sd)
676 {
677 struct i2c_client *client = v4l2_get_subdevdata(sd);
678 struct i2c_adapter *adapter = client->adapter;
679 struct lm3554 *flash = to_lm3554(sd);
680 int ret;
681
682 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
683 dev_err(&client->dev, "lm3554_detect i2c error\n");
684 return -ENODEV;
685 }
686
687 /* Power up the flash driver and reset it */
688 ret = lm3554_s_power(&flash->sd, 1);
689 if (ret < 0) {
690 dev_err(&client->dev, "Failed to power on lm3554 LED flash\n");
691 } else {
692 dev_dbg(&client->dev, "Successfully detected lm3554 LED flash\n");
693 lm3554_s_power(&flash->sd, 0);
694 }
695
696 return ret;
697 }
698
lm3554_open(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)699 static int lm3554_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
700 {
701 return lm3554_s_power(sd, 1);
702 }
703
lm3554_close(struct v4l2_subdev * sd,struct v4l2_subdev_fh * fh)704 static int lm3554_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
705 {
706 return lm3554_s_power(sd, 0);
707 }
708
709 static const struct v4l2_subdev_internal_ops lm3554_internal_ops = {
710 .registered = lm3554_detect,
711 .open = lm3554_open,
712 .close = lm3554_close,
713 };
714
715 /* -----------------------------------------------------------------------------
716 * I2C driver
717 */
718 #ifdef CONFIG_PM
719
lm3554_suspend(struct device * dev)720 static int lm3554_suspend(struct device *dev)
721 {
722 struct i2c_client *client = to_i2c_client(dev);
723 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
724 struct lm3554 *flash = to_lm3554(subdev);
725 int rval;
726
727 if (flash->power_count == 0)
728 return 0;
729
730 rval = __lm3554_s_power(flash, 0);
731
732 dev_dbg(&client->dev, "Suspend %s\n", rval < 0 ? "failed" : "ok");
733
734 return rval;
735 }
736
lm3554_resume(struct device * dev)737 static int lm3554_resume(struct device *dev)
738 {
739 struct i2c_client *client = to_i2c_client(dev);
740 struct v4l2_subdev *subdev = i2c_get_clientdata(client);
741 struct lm3554 *flash = to_lm3554(subdev);
742 int rval;
743
744 if (flash->power_count == 0)
745 return 0;
746
747 rval = __lm3554_s_power(flash, 1);
748
749 dev_dbg(&client->dev, "Resume %s\n", rval < 0 ? "fail" : "ok");
750
751 return rval;
752 }
753
754 #else
755
756 #define lm3554_suspend NULL
757 #define lm3554_resume NULL
758
759 #endif /* CONFIG_PM */
760
lm3554_gpio_init(struct i2c_client * client)761 static int lm3554_gpio_init(struct i2c_client *client)
762 {
763 struct v4l2_subdev *sd = i2c_get_clientdata(client);
764 struct lm3554 *flash = to_lm3554(sd);
765 struct lm3554_platform_data *pdata = flash->pdata;
766 int ret;
767
768 if (!pdata->gpio_reset)
769 return -EINVAL;
770
771 ret = gpiod_direction_output(pdata->gpio_reset, 0);
772 if (ret < 0)
773 return ret;
774
775 if (!pdata->gpio_strobe)
776 return -EINVAL;
777
778 ret = gpiod_direction_output(pdata->gpio_strobe, 0);
779 if (ret < 0)
780 return ret;
781
782 return 0;
783 }
784
lm3554_gpio_uninit(struct i2c_client * client)785 static void lm3554_gpio_uninit(struct i2c_client *client)
786 {
787 struct v4l2_subdev *sd = i2c_get_clientdata(client);
788 struct lm3554 *flash = to_lm3554(sd);
789 struct lm3554_platform_data *pdata = flash->pdata;
790 int ret;
791
792 ret = gpiod_direction_output(pdata->gpio_strobe, 0);
793 if (ret < 0)
794 dev_err(&client->dev,
795 "gpio request/direction_output fail for gpio_strobe");
796
797 ret = gpiod_direction_output(pdata->gpio_reset, 0);
798 if (ret < 0)
799 dev_err(&client->dev,
800 "gpio request/direction_output fail for gpio_reset");
801 }
802
lm3554_platform_data_func(struct i2c_client * client)803 static void *lm3554_platform_data_func(struct i2c_client *client)
804 {
805 static struct lm3554_platform_data platform_data;
806
807 platform_data.gpio_reset = gpiod_get_index(&client->dev,
808 NULL, 2, GPIOD_OUT_LOW);
809 if (IS_ERR(platform_data.gpio_reset))
810 return ERR_CAST(platform_data.gpio_reset);
811 platform_data.gpio_strobe = gpiod_get_index(&client->dev,
812 NULL, 0, GPIOD_OUT_LOW);
813 if (IS_ERR(platform_data.gpio_strobe))
814 return ERR_CAST(platform_data.gpio_strobe);
815 platform_data.gpio_torch = gpiod_get_index(&client->dev,
816 NULL, 1, GPIOD_OUT_LOW);
817 if (IS_ERR(platform_data.gpio_torch))
818 return ERR_CAST(platform_data.gpio_torch);
819
820 /* Set to TX2 mode, then ENVM/TX2 pin is a power amplifier sync input:
821 * ENVM/TX pin asserted, flash forced into torch;
822 * ENVM/TX pin desserted, flash set back;
823 */
824 platform_data.envm_tx2 = 1;
825 platform_data.tx2_polarity = 0;
826
827 /* set peak current limit to be 1000mA */
828 platform_data.current_limit = 0;
829
830 return &platform_data;
831 }
832
lm3554_probe(struct i2c_client * client)833 static int lm3554_probe(struct i2c_client *client)
834 {
835 int err = 0;
836 struct lm3554 *flash;
837 unsigned int i;
838
839 flash = kzalloc(sizeof(*flash), GFP_KERNEL);
840 if (!flash)
841 return -ENOMEM;
842
843 flash->pdata = lm3554_platform_data_func(client);
844 if (IS_ERR(flash->pdata)) {
845 err = PTR_ERR(flash->pdata);
846 goto free_flash;
847 }
848
849 v4l2_i2c_subdev_init(&flash->sd, client, &lm3554_ops);
850 flash->sd.internal_ops = &lm3554_internal_ops;
851 flash->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
852 flash->mode = ATOMISP_FLASH_MODE_OFF;
853 flash->timeout = LM3554_MAX_TIMEOUT / LM3554_TIMEOUT_STEPSIZE - 1;
854 err =
855 v4l2_ctrl_handler_init(&flash->ctrl_handler,
856 ARRAY_SIZE(lm3554_controls));
857 if (err) {
858 dev_err(&client->dev, "error initialize a ctrl_handler.\n");
859 goto unregister_subdev;
860 }
861
862 for (i = 0; i < ARRAY_SIZE(lm3554_controls); i++)
863 v4l2_ctrl_new_custom(&flash->ctrl_handler, &lm3554_controls[i],
864 NULL);
865
866 if (flash->ctrl_handler.error) {
867 dev_err(&client->dev, "ctrl_handler error.\n");
868 err = flash->ctrl_handler.error;
869 goto free_handler;
870 }
871
872 flash->sd.ctrl_handler = &flash->ctrl_handler;
873 err = media_entity_pads_init(&flash->sd.entity, 0, NULL);
874 if (err) {
875 dev_err(&client->dev, "error initialize a media entity.\n");
876 goto free_handler;
877 }
878
879 flash->sd.entity.function = MEDIA_ENT_F_FLASH;
880
881 mutex_init(&flash->power_lock);
882
883 timer_setup(&flash->flash_off_delay, lm3554_flash_off_delay, 0);
884
885 err = lm3554_gpio_init(client);
886 if (err) {
887 dev_err(&client->dev, "gpio request/direction_output fail.\n");
888 goto cleanup_media;
889 }
890
891 err = atomisp_register_i2c_module(&flash->sd, NULL, LED_FLASH);
892 if (err) {
893 dev_err(&client->dev, "fail to register atomisp i2c module.\n");
894 goto uninit_gpio;
895 }
896
897 return 0;
898
899 uninit_gpio:
900 lm3554_gpio_uninit(client);
901 cleanup_media:
902 media_entity_cleanup(&flash->sd.entity);
903 free_handler:
904 v4l2_ctrl_handler_free(&flash->ctrl_handler);
905 unregister_subdev:
906 v4l2_device_unregister_subdev(&flash->sd);
907 free_flash:
908 kfree(flash);
909
910 return err;
911 }
912
lm3554_remove(struct i2c_client * client)913 static void lm3554_remove(struct i2c_client *client)
914 {
915 struct v4l2_subdev *sd = i2c_get_clientdata(client);
916 struct lm3554 *flash = to_lm3554(sd);
917
918 media_entity_cleanup(&flash->sd.entity);
919 v4l2_ctrl_handler_free(&flash->ctrl_handler);
920 v4l2_device_unregister_subdev(sd);
921
922 atomisp_gmin_remove_subdev(sd);
923
924 timer_shutdown_sync(&flash->flash_off_delay);
925
926 lm3554_gpio_uninit(client);
927
928 kfree(flash);
929 }
930
931 static const struct dev_pm_ops lm3554_pm_ops = {
932 .suspend = lm3554_suspend,
933 .resume = lm3554_resume,
934 };
935
936 static const struct acpi_device_id lm3554_acpi_match[] = {
937 { "INTCF1C" },
938 {},
939 };
940 MODULE_DEVICE_TABLE(acpi, lm3554_acpi_match);
941
942 static struct i2c_driver lm3554_driver = {
943 .driver = {
944 .name = "lm3554",
945 .pm = &lm3554_pm_ops,
946 .acpi_match_table = lm3554_acpi_match,
947 },
948 .probe = lm3554_probe,
949 .remove = lm3554_remove,
950 };
951 module_i2c_driver(lm3554_driver);
952
953 MODULE_AUTHOR("Jing Tao <jing.tao@intel.com>");
954 MODULE_DESCRIPTION("LED flash driver for LM3554");
955 MODULE_LICENSE("GPL");
956
