1 /*
2 * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
3 *
4 * Copyright (C) 2008-2011 Nokia Corporation
5 * Copyright (c) 2011, 2017 Intel Corporation.
6 *
7 * Based on drivers/media/i2c/as3645a.c.
8 *
9 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 */
20
21 #include <linux/delay.h>
22 #include <linux/gpio/consumer.h>
23 #include <linux/i2c.h>
24 #include <linux/led-class-flash.h>
25 #include <linux/leds.h>
26 #include <linux/module.h>
27 #include <linux/mutex.h>
28 #include <linux/of.h>
29 #include <linux/slab.h>
30
31 #include <media/v4l2-flash-led-class.h>
32
33 #define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50)
34 #define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000)
35
36 /* Register definitions */
37
38 /* Read-only Design info register: Reset state: xxxx 0001 */
39 #define AS_DESIGN_INFO_REG 0x00
40 #define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4))
41 #define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f)
42
43 /* Read-only Version control register: Reset state: 0000 0000
44 * for first engineering samples
45 */
46 #define AS_VERSION_CONTROL_REG 0x01
47 #define AS_VERSION_CONTROL_RFU(x) (((x) >> 4))
48 #define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f)
49
50 /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
51 #define AS_INDICATOR_AND_TIMER_REG 0x02
52 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0
53 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4
54 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6
55
56 /* Read / Write (Current set register): Reset state: 0110 1001 */
57 #define AS_CURRENT_SET_REG 0x03
58 #define AS_CURRENT_ASSIST_LIGHT_SHIFT 0
59 #define AS_CURRENT_LED_DET_ON (1 << 3)
60 #define AS_CURRENT_FLASH_CURRENT_SHIFT 4
61
62 /* Read / Write (Control register): Reset state: 1011 0100 */
63 #define AS_CONTROL_REG 0x04
64 #define AS_CONTROL_MODE_SETTING_SHIFT 0
65 #define AS_CONTROL_STROBE_ON (1 << 2)
66 #define AS_CONTROL_OUT_ON (1 << 3)
67 #define AS_CONTROL_EXT_TORCH_ON (1 << 4)
68 #define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5)
69 #define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5)
70 #define AS_CONTROL_COIL_PEAK_SHIFT 6
71
72 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
73 #define AS_FAULT_INFO_REG 0x05
74 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1)
75 #define AS_FAULT_INFO_INDICATOR_LED (1 << 2)
76 #define AS_FAULT_INFO_LED_AMOUNT (1 << 3)
77 #define AS_FAULT_INFO_TIMEOUT (1 << 4)
78 #define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5)
79 #define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6)
80 #define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7)
81
82 /* Boost register */
83 #define AS_BOOST_REG 0x0d
84 #define AS_BOOST_CURRENT_DISABLE (0 << 0)
85 #define AS_BOOST_CURRENT_ENABLE (1 << 0)
86
87 /* Password register is used to unlock boost register writing */
88 #define AS_PASSWORD_REG 0x0f
89 #define AS_PASSWORD_UNLOCK_VALUE 0x55
90
91 #define AS_NAME "as3645a"
92 #define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */
93
94 #define AS_FLASH_TIMEOUT_MIN 100000 /* us */
95 #define AS_FLASH_TIMEOUT_MAX 850000
96 #define AS_FLASH_TIMEOUT_STEP 50000
97
98 #define AS_FLASH_INTENSITY_MIN 200000 /* uA */
99 #define AS_FLASH_INTENSITY_MAX_1LED 500000
100 #define AS_FLASH_INTENSITY_MAX_2LEDS 400000
101 #define AS_FLASH_INTENSITY_STEP 20000
102
103 #define AS_TORCH_INTENSITY_MIN 20000 /* uA */
104 #define AS_TORCH_INTENSITY_MAX 160000
105 #define AS_TORCH_INTENSITY_STEP 20000
106
107 #define AS_INDICATOR_INTENSITY_MIN 0 /* uA */
108 #define AS_INDICATOR_INTENSITY_MAX 10000
109 #define AS_INDICATOR_INTENSITY_STEP 2500
110
111 #define AS_PEAK_mA_MAX 2000
112 #define AS_PEAK_mA_TO_REG(a) \
113 ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
114
115 /* LED numbers for Devicetree */
116 #define AS_LED_FLASH 0
117 #define AS_LED_INDICATOR 1
118
119 enum as_mode {
120 AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
121 AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
122 AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
123 AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
124 };
125
126 struct as3645a_config {
127 u32 flash_timeout_us;
128 u32 flash_max_ua;
129 u32 assist_max_ua;
130 u32 indicator_max_ua;
131 u32 voltage_reference;
132 u32 peak;
133 };
134
135 struct as3645a_names {
136 char flash[32];
137 char indicator[32];
138 };
139
140 struct as3645a {
141 struct i2c_client *client;
142
143 struct mutex mutex;
144
145 struct led_classdev_flash fled;
146 struct led_classdev iled_cdev;
147
148 struct v4l2_flash *vf;
149 struct v4l2_flash *vfind;
150
151 struct device_node *flash_node;
152 struct device_node *indicator_node;
153
154 struct as3645a_config cfg;
155
156 enum as_mode mode;
157 unsigned int timeout;
158 unsigned int flash_current;
159 unsigned int assist_current;
160 unsigned int indicator_current;
161 enum v4l2_flash_strobe_source strobe_source;
162 };
163
164 #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
165 #define iled_cdev_to_as3645a(__iled_cdev) \
166 container_of(__iled_cdev, struct as3645a, iled_cdev)
167
168 /* Return negative errno else zero on success */
as3645a_write(struct as3645a * flash,u8 addr,u8 val)169 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
170 {
171 struct i2c_client *client = flash->client;
172 int rval;
173
174 rval = i2c_smbus_write_byte_data(client, addr, val);
175
176 dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
177 rval < 0 ? "fail" : "ok");
178
179 return rval;
180 }
181
182 /* Return negative errno else a data byte received from the device. */
as3645a_read(struct as3645a * flash,u8 addr)183 static int as3645a_read(struct as3645a *flash, u8 addr)
184 {
185 struct i2c_client *client = flash->client;
186 int rval;
187
188 rval = i2c_smbus_read_byte_data(client, addr);
189
190 dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
191 rval < 0 ? "fail" : "ok");
192
193 return rval;
194 }
195
196 /* -----------------------------------------------------------------------------
197 * Hardware configuration and trigger
198 */
199
200 /**
201 * as3645a_set_config - Set flash configuration registers
202 * @flash: The flash
203 *
204 * Configure the hardware with flash, assist and indicator currents, as well as
205 * flash timeout.
206 *
207 * Return 0 on success, or a negative error code if an I2C communication error
208 * occurred.
209 */
as3645a_set_current(struct as3645a * flash)210 static int as3645a_set_current(struct as3645a *flash)
211 {
212 u8 val;
213
214 val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
215 | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
216 | AS_CURRENT_LED_DET_ON;
217
218 return as3645a_write(flash, AS_CURRENT_SET_REG, val);
219 }
220
as3645a_set_timeout(struct as3645a * flash)221 static int as3645a_set_timeout(struct as3645a *flash)
222 {
223 u8 val;
224
225 val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
226
227 val |= (flash->cfg.voltage_reference
228 << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
229 | ((flash->indicator_current ? flash->indicator_current - 1 : 0)
230 << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
231
232 return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
233 }
234
235 /**
236 * as3645a_set_control - Set flash control register
237 * @flash: The flash
238 * @mode: Desired output mode
239 * @on: Desired output state
240 *
241 * Configure the hardware with output mode and state.
242 *
243 * Return 0 on success, or a negative error code if an I2C communication error
244 * occurred.
245 */
246 static int
as3645a_set_control(struct as3645a * flash,enum as_mode mode,bool on)247 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
248 {
249 u8 reg;
250
251 /* Configure output parameters and operation mode. */
252 reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
253 | (on ? AS_CONTROL_OUT_ON : 0)
254 | mode;
255
256 if (mode == AS_MODE_FLASH &&
257 flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
258 reg |= AS_CONTROL_STROBE_TYPE_LEVEL
259 | AS_CONTROL_STROBE_ON;
260
261 return as3645a_write(flash, AS_CONTROL_REG, reg);
262 }
263
as3645a_get_fault(struct led_classdev_flash * fled,u32 * fault)264 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
265 {
266 struct as3645a *flash = fled_to_as3645a(fled);
267 int rval;
268
269 /* NOTE: reading register clears fault status */
270 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
271 if (rval < 0)
272 return rval;
273
274 if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
275 *fault |= LED_FAULT_OVER_CURRENT;
276
277 if (rval & AS_FAULT_INFO_INDICATOR_LED)
278 *fault |= LED_FAULT_INDICATOR;
279
280 dev_dbg(&flash->client->dev, "%u connected LEDs\n",
281 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
282
283 if (rval & AS_FAULT_INFO_TIMEOUT)
284 *fault |= LED_FAULT_TIMEOUT;
285
286 if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
287 *fault |= LED_FAULT_OVER_TEMPERATURE;
288
289 if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
290 *fault |= LED_FAULT_OVER_CURRENT;
291
292 if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
293 *fault |= LED_FAULT_INPUT_VOLTAGE;
294
295 return rval;
296 }
297
__as3645a_current_to_reg(unsigned int min,unsigned int max,unsigned int step,unsigned int val)298 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
299 unsigned int step,
300 unsigned int val)
301 {
302 if (val < min)
303 val = min;
304
305 if (val > max)
306 val = max;
307
308 return (val - min) / step;
309 }
310
as3645a_current_to_reg(struct as3645a * flash,bool is_flash,unsigned int ua)311 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
312 unsigned int ua)
313 {
314 if (is_flash)
315 return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
316 flash->cfg.assist_max_ua,
317 AS_TORCH_INTENSITY_STEP, ua);
318 else
319 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
320 flash->cfg.flash_max_ua,
321 AS_FLASH_INTENSITY_STEP, ua);
322 }
323
as3645a_set_indicator_brightness(struct led_classdev * iled_cdev,enum led_brightness brightness)324 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
325 enum led_brightness brightness)
326 {
327 struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
328 int rval;
329
330 flash->indicator_current = brightness;
331
332 rval = as3645a_set_timeout(flash);
333 if (rval)
334 return rval;
335
336 return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
337 }
338
as3645a_set_assist_brightness(struct led_classdev * fled_cdev,enum led_brightness brightness)339 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
340 enum led_brightness brightness)
341 {
342 struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
343 struct as3645a *flash = fled_to_as3645a(fled);
344 int rval;
345
346 if (brightness) {
347 /* Register value 0 is 20 mA. */
348 flash->assist_current = brightness - 1;
349
350 rval = as3645a_set_current(flash);
351 if (rval)
352 return rval;
353 }
354
355 return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
356 }
357
as3645a_set_flash_brightness(struct led_classdev_flash * fled,u32 brightness_ua)358 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
359 u32 brightness_ua)
360 {
361 struct as3645a *flash = fled_to_as3645a(fled);
362
363 flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua);
364
365 return as3645a_set_current(flash);
366 }
367
as3645a_set_flash_timeout(struct led_classdev_flash * fled,u32 timeout_us)368 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
369 u32 timeout_us)
370 {
371 struct as3645a *flash = fled_to_as3645a(fled);
372
373 flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
374
375 return as3645a_set_timeout(flash);
376 }
377
as3645a_set_strobe(struct led_classdev_flash * fled,bool state)378 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
379 {
380 struct as3645a *flash = fled_to_as3645a(fled);
381
382 return as3645a_set_control(flash, AS_MODE_FLASH, state);
383 }
384
385 static const struct led_flash_ops as3645a_led_flash_ops = {
386 .flash_brightness_set = as3645a_set_flash_brightness,
387 .timeout_set = as3645a_set_flash_timeout,
388 .strobe_set = as3645a_set_strobe,
389 .fault_get = as3645a_get_fault,
390 };
391
as3645a_setup(struct as3645a * flash)392 static int as3645a_setup(struct as3645a *flash)
393 {
394 struct device *dev = &flash->client->dev;
395 u32 fault = 0;
396 int rval;
397
398 /* clear errors */
399 rval = as3645a_read(flash, AS_FAULT_INFO_REG);
400 if (rval < 0)
401 return rval;
402
403 dev_dbg(dev, "Fault info: %02x\n", rval);
404
405 rval = as3645a_set_current(flash);
406 if (rval < 0)
407 return rval;
408
409 rval = as3645a_set_timeout(flash);
410 if (rval < 0)
411 return rval;
412
413 rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
414 if (rval < 0)
415 return rval;
416
417 /* read status */
418 rval = as3645a_get_fault(&flash->fled, &fault);
419 if (rval < 0)
420 return rval;
421
422 dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
423 as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
424 dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
425 as3645a_read(flash, AS_CURRENT_SET_REG));
426 dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
427 as3645a_read(flash, AS_CONTROL_REG));
428
429 return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
430 }
431
as3645a_detect(struct as3645a * flash)432 static int as3645a_detect(struct as3645a *flash)
433 {
434 struct device *dev = &flash->client->dev;
435 int rval, man, model, rfu, version;
436 const char *vendor;
437
438 rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
439 if (rval < 0) {
440 dev_err(dev, "can't read design info reg\n");
441 return rval;
442 }
443
444 man = AS_DESIGN_INFO_FACTORY(rval);
445 model = AS_DESIGN_INFO_MODEL(rval);
446
447 rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
448 if (rval < 0) {
449 dev_err(dev, "can't read version control reg\n");
450 return rval;
451 }
452
453 rfu = AS_VERSION_CONTROL_RFU(rval);
454 version = AS_VERSION_CONTROL_VERSION(rval);
455
456 /* Verify the chip model and version. */
457 if (model != 0x01 || rfu != 0x00) {
458 dev_err(dev, "AS3645A not detected "
459 "(model %d rfu %d)\n", model, rfu);
460 return -ENODEV;
461 }
462
463 switch (man) {
464 case 1:
465 vendor = "AMS, Austria Micro Systems";
466 break;
467 case 2:
468 vendor = "ADI, Analog Devices Inc.";
469 break;
470 case 3:
471 vendor = "NSC, National Semiconductor";
472 break;
473 case 4:
474 vendor = "NXP";
475 break;
476 case 5:
477 vendor = "TI, Texas Instrument";
478 break;
479 default:
480 vendor = "Unknown";
481 }
482
483 dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
484 man, version);
485
486 rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
487 if (rval < 0)
488 return rval;
489
490 return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
491 }
492
as3645a_parse_node(struct as3645a * flash,struct as3645a_names * names,struct device_node * node)493 static int as3645a_parse_node(struct as3645a *flash,
494 struct as3645a_names *names,
495 struct device_node *node)
496 {
497 struct as3645a_config *cfg = &flash->cfg;
498 struct device_node *child;
499 const char *name;
500 int rval;
501
502 for_each_child_of_node(node, child) {
503 u32 id = 0;
504
505 of_property_read_u32(child, "reg", &id);
506
507 switch (id) {
508 case AS_LED_FLASH:
509 flash->flash_node = of_node_get(child);
510 break;
511 case AS_LED_INDICATOR:
512 flash->indicator_node = of_node_get(child);
513 break;
514 default:
515 dev_warn(&flash->client->dev,
516 "unknown LED %u encountered, ignoring\n", id);
517 break;
518 }
519 }
520
521 if (!flash->flash_node) {
522 dev_err(&flash->client->dev, "can't find flash node\n");
523 return -ENODEV;
524 }
525
526 rval = of_property_read_string(flash->flash_node, "label", &name);
527 if (!rval)
528 strlcpy(names->flash, name, sizeof(names->flash));
529 else
530 snprintf(names->flash, sizeof(names->flash),
531 "%s:flash", node->name);
532
533 rval = of_property_read_u32(flash->flash_node, "flash-timeout-us",
534 &cfg->flash_timeout_us);
535 if (rval < 0) {
536 dev_err(&flash->client->dev,
537 "can't read flash-timeout-us property for flash\n");
538 goto out_err;
539 }
540
541 rval = of_property_read_u32(flash->flash_node, "flash-max-microamp",
542 &cfg->flash_max_ua);
543 if (rval < 0) {
544 dev_err(&flash->client->dev,
545 "can't read flash-max-microamp property for flash\n");
546 goto out_err;
547 }
548
549 rval = of_property_read_u32(flash->flash_node, "led-max-microamp",
550 &cfg->assist_max_ua);
551 if (rval < 0) {
552 dev_err(&flash->client->dev,
553 "can't read led-max-microamp property for flash\n");
554 goto out_err;
555 }
556
557 of_property_read_u32(flash->flash_node, "voltage-reference",
558 &cfg->voltage_reference);
559
560 of_property_read_u32(flash->flash_node, "ams,input-max-microamp",
561 &cfg->peak);
562 cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
563
564 if (!flash->indicator_node) {
565 dev_warn(&flash->client->dev,
566 "can't find indicator node\n");
567 goto out_err;
568 }
569
570 rval = of_property_read_string(flash->indicator_node, "label", &name);
571 if (!rval)
572 strlcpy(names->indicator, name, sizeof(names->indicator));
573 else
574 snprintf(names->indicator, sizeof(names->indicator),
575 "%s:indicator", node->name);
576
577 rval = of_property_read_u32(flash->indicator_node, "led-max-microamp",
578 &cfg->indicator_max_ua);
579 if (rval < 0) {
580 dev_err(&flash->client->dev,
581 "can't read led-max-microamp property for indicator\n");
582 goto out_err;
583 }
584
585 return 0;
586
587 out_err:
588 of_node_put(flash->flash_node);
589 of_node_put(flash->indicator_node);
590
591 return rval;
592 }
593
as3645a_led_class_setup(struct as3645a * flash,struct as3645a_names * names)594 static int as3645a_led_class_setup(struct as3645a *flash,
595 struct as3645a_names *names)
596 {
597 struct led_classdev *fled_cdev = &flash->fled.led_cdev;
598 struct led_classdev *iled_cdev = &flash->iled_cdev;
599 struct led_flash_setting *cfg;
600 int rval;
601
602 iled_cdev->name = names->indicator;
603 iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
604 iled_cdev->max_brightness =
605 flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
606 iled_cdev->flags = LED_CORE_SUSPENDRESUME;
607
608 rval = led_classdev_register(&flash->client->dev, iled_cdev);
609 if (rval < 0)
610 return rval;
611
612 cfg = &flash->fled.brightness;
613 cfg->min = AS_FLASH_INTENSITY_MIN;
614 cfg->max = flash->cfg.flash_max_ua;
615 cfg->step = AS_FLASH_INTENSITY_STEP;
616 cfg->val = flash->cfg.flash_max_ua;
617
618 cfg = &flash->fled.timeout;
619 cfg->min = AS_FLASH_TIMEOUT_MIN;
620 cfg->max = flash->cfg.flash_timeout_us;
621 cfg->step = AS_FLASH_TIMEOUT_STEP;
622 cfg->val = flash->cfg.flash_timeout_us;
623
624 flash->fled.ops = &as3645a_led_flash_ops;
625
626 fled_cdev->name = names->flash;
627 fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
628 /* Value 0 is off in LED class. */
629 fled_cdev->max_brightness =
630 as3645a_current_to_reg(flash, false,
631 flash->cfg.assist_max_ua) + 1;
632 fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
633
634 rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
635 if (rval) {
636 led_classdev_unregister(iled_cdev);
637 dev_err(&flash->client->dev,
638 "led_classdev_flash_register() failed, error %d\n",
639 rval);
640 }
641
642 return rval;
643 }
644
as3645a_v4l2_setup(struct as3645a * flash)645 static int as3645a_v4l2_setup(struct as3645a *flash)
646 {
647 struct led_classdev_flash *fled = &flash->fled;
648 struct led_classdev *led = &fled->led_cdev;
649 struct v4l2_flash_config cfg = {
650 .intensity = {
651 .min = AS_TORCH_INTENSITY_MIN,
652 .max = flash->cfg.assist_max_ua,
653 .step = AS_TORCH_INTENSITY_STEP,
654 .val = flash->cfg.assist_max_ua,
655 },
656 };
657 struct v4l2_flash_config cfgind = {
658 .intensity = {
659 .min = AS_INDICATOR_INTENSITY_MIN,
660 .max = flash->cfg.indicator_max_ua,
661 .step = AS_INDICATOR_INTENSITY_STEP,
662 .val = flash->cfg.indicator_max_ua,
663 },
664 };
665
666 strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
667 strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
668
669 flash->vf = v4l2_flash_init(
670 &flash->client->dev, of_fwnode_handle(flash->flash_node),
671 &flash->fled, NULL, &cfg);
672 if (IS_ERR(flash->vf))
673 return PTR_ERR(flash->vf);
674
675 flash->vfind = v4l2_flash_indicator_init(
676 &flash->client->dev, of_fwnode_handle(flash->indicator_node),
677 &flash->iled_cdev, &cfgind);
678 if (IS_ERR(flash->vfind)) {
679 v4l2_flash_release(flash->vf);
680 return PTR_ERR(flash->vfind);
681 }
682
683 return 0;
684 }
685
as3645a_probe(struct i2c_client * client)686 static int as3645a_probe(struct i2c_client *client)
687 {
688 struct as3645a_names names;
689 struct as3645a *flash;
690 int rval;
691
692 if (client->dev.of_node == NULL)
693 return -ENODEV;
694
695 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
696 if (flash == NULL)
697 return -ENOMEM;
698
699 flash->client = client;
700
701 rval = as3645a_parse_node(flash, &names, client->dev.of_node);
702 if (rval < 0)
703 return rval;
704
705 rval = as3645a_detect(flash);
706 if (rval < 0)
707 goto out_put_nodes;
708
709 mutex_init(&flash->mutex);
710 i2c_set_clientdata(client, flash);
711
712 rval = as3645a_setup(flash);
713 if (rval)
714 goto out_mutex_destroy;
715
716 rval = as3645a_led_class_setup(flash, &names);
717 if (rval)
718 goto out_mutex_destroy;
719
720 rval = as3645a_v4l2_setup(flash);
721 if (rval)
722 goto out_led_classdev_flash_unregister;
723
724 return 0;
725
726 out_led_classdev_flash_unregister:
727 led_classdev_flash_unregister(&flash->fled);
728
729 out_mutex_destroy:
730 mutex_destroy(&flash->mutex);
731
732 out_put_nodes:
733 of_node_put(flash->flash_node);
734 of_node_put(flash->indicator_node);
735
736 return rval;
737 }
738
as3645a_remove(struct i2c_client * client)739 static int as3645a_remove(struct i2c_client *client)
740 {
741 struct as3645a *flash = i2c_get_clientdata(client);
742
743 as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
744
745 v4l2_flash_release(flash->vf);
746 v4l2_flash_release(flash->vfind);
747
748 led_classdev_flash_unregister(&flash->fled);
749 led_classdev_unregister(&flash->iled_cdev);
750
751 mutex_destroy(&flash->mutex);
752
753 of_node_put(flash->flash_node);
754 of_node_put(flash->indicator_node);
755
756 return 0;
757 }
758
759 static const struct i2c_device_id as3645a_id_table[] = {
760 { AS_NAME, 0 },
761 { },
762 };
763 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
764
765 static const struct of_device_id as3645a_of_table[] = {
766 { .compatible = "ams,as3645a" },
767 { },
768 };
769 MODULE_DEVICE_TABLE(of, as3645a_of_table);
770
771 static struct i2c_driver as3645a_i2c_driver = {
772 .driver = {
773 .of_match_table = as3645a_of_table,
774 .name = AS_NAME,
775 },
776 .probe_new = as3645a_probe,
777 .remove = as3645a_remove,
778 .id_table = as3645a_id_table,
779 };
780
781 module_i2c_driver(as3645a_i2c_driver);
782
783 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
784 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
785 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
786 MODULE_LICENSE("GPL v2");
787