1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
4  *
5  * Copyright (C) 2008-2011 Nokia Corporation
6  * Copyright (c) 2011, 2017 Intel Corporation.
7  *
8  * Based on drivers/media/i2c/as3645a.c.
9  *
10  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
11  */
12 
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/i2c.h>
16 #include <linux/led-class-flash.h>
17 #include <linux/leds.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/property.h>
21 #include <linux/slab.h>
22 
23 #include <media/v4l2-flash-led-class.h>
24 
25 #define AS_TIMER_US_TO_CODE(t)			(((t) / 1000 - 100) / 50)
26 #define AS_TIMER_CODE_TO_US(c)			((50 * (c) + 100) * 1000)
27 
28 /* Register definitions */
29 
30 /* Read-only Design info register: Reset state: xxxx 0001 */
31 #define AS_DESIGN_INFO_REG			0x00
32 #define AS_DESIGN_INFO_FACTORY(x)		(((x) >> 4))
33 #define AS_DESIGN_INFO_MODEL(x)			((x) & 0x0f)
34 
35 /* Read-only Version control register: Reset state: 0000 0000
36  * for first engineering samples
37  */
38 #define AS_VERSION_CONTROL_REG			0x01
39 #define AS_VERSION_CONTROL_RFU(x)		(((x) >> 4))
40 #define AS_VERSION_CONTROL_VERSION(x)		((x) & 0x0f)
41 
42 /* Read / Write	(Indicator and timer register): Reset state: 0000 1111 */
43 #define AS_INDICATOR_AND_TIMER_REG		0x02
44 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT	0
45 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT	4
46 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT	6
47 
48 /* Read / Write	(Current set register): Reset state: 0110 1001 */
49 #define AS_CURRENT_SET_REG			0x03
50 #define AS_CURRENT_ASSIST_LIGHT_SHIFT		0
51 #define AS_CURRENT_LED_DET_ON			(1 << 3)
52 #define AS_CURRENT_FLASH_CURRENT_SHIFT		4
53 
54 /* Read / Write	(Control register): Reset state: 1011 0100 */
55 #define AS_CONTROL_REG				0x04
56 #define AS_CONTROL_MODE_SETTING_SHIFT		0
57 #define AS_CONTROL_STROBE_ON			(1 << 2)
58 #define AS_CONTROL_OUT_ON			(1 << 3)
59 #define AS_CONTROL_EXT_TORCH_ON			(1 << 4)
60 #define AS_CONTROL_STROBE_TYPE_EDGE		(0 << 5)
61 #define AS_CONTROL_STROBE_TYPE_LEVEL		(1 << 5)
62 #define AS_CONTROL_COIL_PEAK_SHIFT		6
63 
64 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
65 #define AS_FAULT_INFO_REG			0x05
66 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT	(1 << 1)
67 #define AS_FAULT_INFO_INDICATOR_LED		(1 << 2)
68 #define AS_FAULT_INFO_LED_AMOUNT		(1 << 3)
69 #define AS_FAULT_INFO_TIMEOUT			(1 << 4)
70 #define AS_FAULT_INFO_OVER_TEMPERATURE		(1 << 5)
71 #define AS_FAULT_INFO_SHORT_CIRCUIT		(1 << 6)
72 #define AS_FAULT_INFO_OVER_VOLTAGE		(1 << 7)
73 
74 /* Boost register */
75 #define AS_BOOST_REG				0x0d
76 #define AS_BOOST_CURRENT_DISABLE		(0 << 0)
77 #define AS_BOOST_CURRENT_ENABLE			(1 << 0)
78 
79 /* Password register is used to unlock boost register writing */
80 #define AS_PASSWORD_REG				0x0f
81 #define AS_PASSWORD_UNLOCK_VALUE		0x55
82 
83 #define AS_NAME					"as3645a"
84 #define AS_I2C_ADDR				(0x60 >> 1) /* W:0x60, R:0x61 */
85 
86 #define AS_FLASH_TIMEOUT_MIN			100000	/* us */
87 #define AS_FLASH_TIMEOUT_MAX			850000
88 #define AS_FLASH_TIMEOUT_STEP			50000
89 
90 #define AS_FLASH_INTENSITY_MIN			200000	/* uA */
91 #define AS_FLASH_INTENSITY_MAX_1LED		500000
92 #define AS_FLASH_INTENSITY_MAX_2LEDS		400000
93 #define AS_FLASH_INTENSITY_STEP			20000
94 
95 #define AS_TORCH_INTENSITY_MIN			20000	/* uA */
96 #define AS_TORCH_INTENSITY_MAX			160000
97 #define AS_TORCH_INTENSITY_STEP			20000
98 
99 #define AS_INDICATOR_INTENSITY_MIN		0	/* uA */
100 #define AS_INDICATOR_INTENSITY_MAX		10000
101 #define AS_INDICATOR_INTENSITY_STEP		2500
102 
103 #define AS_PEAK_mA_MAX				2000
104 #define AS_PEAK_mA_TO_REG(a) \
105 	((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
106 
107 /* LED numbers for Devicetree */
108 #define AS_LED_FLASH				0
109 #define AS_LED_INDICATOR			1
110 
111 enum as_mode {
112 	AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
113 	AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
114 	AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
115 	AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
116 };
117 
118 struct as3645a_config {
119 	u32 flash_timeout_us;
120 	u32 flash_max_ua;
121 	u32 assist_max_ua;
122 	u32 indicator_max_ua;
123 	u32 voltage_reference;
124 	u32 peak;
125 };
126 
127 struct as3645a {
128 	struct i2c_client *client;
129 
130 	struct mutex mutex;
131 
132 	struct led_classdev_flash fled;
133 	struct led_classdev iled_cdev;
134 
135 	struct v4l2_flash *vf;
136 	struct v4l2_flash *vfind;
137 
138 	struct fwnode_handle *flash_node;
139 	struct fwnode_handle *indicator_node;
140 
141 	struct as3645a_config cfg;
142 
143 	enum as_mode mode;
144 	unsigned int timeout;
145 	unsigned int flash_current;
146 	unsigned int assist_current;
147 	unsigned int indicator_current;
148 	enum v4l2_flash_strobe_source strobe_source;
149 };
150 
151 #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
152 #define iled_cdev_to_as3645a(__iled_cdev) \
153 	container_of(__iled_cdev, struct as3645a, iled_cdev)
154 
155 /* Return negative errno else zero on success */
156 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
157 {
158 	struct i2c_client *client = flash->client;
159 	int rval;
160 
161 	rval = i2c_smbus_write_byte_data(client, addr, val);
162 
163 	dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
164 		rval < 0 ? "fail" : "ok");
165 
166 	return rval;
167 }
168 
169 /* Return negative errno else a data byte received from the device. */
170 static int as3645a_read(struct as3645a *flash, u8 addr)
171 {
172 	struct i2c_client *client = flash->client;
173 	int rval;
174 
175 	rval = i2c_smbus_read_byte_data(client, addr);
176 
177 	dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
178 		rval < 0 ? "fail" : "ok");
179 
180 	return rval;
181 }
182 
183 /* -----------------------------------------------------------------------------
184  * Hardware configuration and trigger
185  */
186 
187 /**
188  * as3645a_set_current - Set flash configuration registers
189  * @flash: The flash
190  *
191  * Configure the hardware with flash, assist and indicator currents, as well as
192  * flash timeout.
193  *
194  * Return 0 on success, or a negative error code if an I2C communication error
195  * occurred.
196  */
197 static int as3645a_set_current(struct as3645a *flash)
198 {
199 	u8 val;
200 
201 	val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
202 	    | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
203 	    | AS_CURRENT_LED_DET_ON;
204 
205 	return as3645a_write(flash, AS_CURRENT_SET_REG, val);
206 }
207 
208 static int as3645a_set_timeout(struct as3645a *flash)
209 {
210 	u8 val;
211 
212 	val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
213 
214 	val |= (flash->cfg.voltage_reference
215 		<< AS_INDICATOR_AND_TIMER_VREF_SHIFT)
216 	    |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
217 		 << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
218 
219 	return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
220 }
221 
222 /**
223  * as3645a_set_control - Set flash control register
224  * @flash: The flash
225  * @mode: Desired output mode
226  * @on: Desired output state
227  *
228  * Configure the hardware with output mode and state.
229  *
230  * Return 0 on success, or a negative error code if an I2C communication error
231  * occurred.
232  */
233 static int
234 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
235 {
236 	u8 reg;
237 
238 	/* Configure output parameters and operation mode. */
239 	reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
240 	    | (on ? AS_CONTROL_OUT_ON : 0)
241 	    | mode;
242 
243 	if (mode == AS_MODE_FLASH &&
244 	    flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
245 		reg |= AS_CONTROL_STROBE_TYPE_LEVEL
246 		    |  AS_CONTROL_STROBE_ON;
247 
248 	return as3645a_write(flash, AS_CONTROL_REG, reg);
249 }
250 
251 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
252 {
253 	struct as3645a *flash = fled_to_as3645a(fled);
254 	int rval;
255 
256 	/* NOTE: reading register clears fault status */
257 	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
258 	if (rval < 0)
259 		return rval;
260 
261 	if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
262 		*fault |= LED_FAULT_OVER_CURRENT;
263 
264 	if (rval & AS_FAULT_INFO_INDICATOR_LED)
265 		*fault |= LED_FAULT_INDICATOR;
266 
267 	dev_dbg(&flash->client->dev, "%u connected LEDs\n",
268 		rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
269 
270 	if (rval & AS_FAULT_INFO_TIMEOUT)
271 		*fault |= LED_FAULT_TIMEOUT;
272 
273 	if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
274 		*fault |= LED_FAULT_OVER_TEMPERATURE;
275 
276 	if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
277 		*fault |= LED_FAULT_OVER_CURRENT;
278 
279 	if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
280 		*fault |= LED_FAULT_INPUT_VOLTAGE;
281 
282 	return rval;
283 }
284 
285 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
286 					     unsigned int step,
287 					     unsigned int val)
288 {
289 	if (val < min)
290 		val = min;
291 
292 	if (val > max)
293 		val = max;
294 
295 	return (val - min) / step;
296 }
297 
298 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
299 					   unsigned int ua)
300 {
301 	if (is_flash)
302 		return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
303 						flash->cfg.assist_max_ua,
304 						AS_TORCH_INTENSITY_STEP, ua);
305 	else
306 		return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
307 						flash->cfg.flash_max_ua,
308 						AS_FLASH_INTENSITY_STEP, ua);
309 }
310 
311 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
312 					    enum led_brightness brightness)
313 {
314 	struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
315 	int rval;
316 
317 	flash->indicator_current = brightness;
318 
319 	rval = as3645a_set_timeout(flash);
320 	if (rval)
321 		return rval;
322 
323 	return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
324 }
325 
326 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
327 					 enum led_brightness brightness)
328 {
329 	struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
330 	struct as3645a *flash = fled_to_as3645a(fled);
331 	int rval;
332 
333 	if (brightness) {
334 		/* Register value 0 is 20 mA. */
335 		flash->assist_current = brightness - 1;
336 
337 		rval = as3645a_set_current(flash);
338 		if (rval)
339 			return rval;
340 	}
341 
342 	return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
343 }
344 
345 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
346 					u32 brightness_ua)
347 {
348 	struct as3645a *flash = fled_to_as3645a(fled);
349 
350 	flash->flash_current = as3645a_current_to_reg(flash, true,
351 						      brightness_ua);
352 
353 	return as3645a_set_current(flash);
354 }
355 
356 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
357 				     u32 timeout_us)
358 {
359 	struct as3645a *flash = fled_to_as3645a(fled);
360 
361 	flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
362 
363 	return as3645a_set_timeout(flash);
364 }
365 
366 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
367 {
368 	struct as3645a *flash = fled_to_as3645a(fled);
369 
370 	return as3645a_set_control(flash, AS_MODE_FLASH, state);
371 }
372 
373 static const struct led_flash_ops as3645a_led_flash_ops = {
374 	.flash_brightness_set = as3645a_set_flash_brightness,
375 	.timeout_set = as3645a_set_flash_timeout,
376 	.strobe_set = as3645a_set_strobe,
377 	.fault_get = as3645a_get_fault,
378 };
379 
380 static int as3645a_setup(struct as3645a *flash)
381 {
382 	struct device *dev = &flash->client->dev;
383 	u32 fault = 0;
384 	int rval;
385 
386 	/* clear errors */
387 	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
388 	if (rval < 0)
389 		return rval;
390 
391 	dev_dbg(dev, "Fault info: %02x\n", rval);
392 
393 	rval = as3645a_set_current(flash);
394 	if (rval < 0)
395 		return rval;
396 
397 	rval = as3645a_set_timeout(flash);
398 	if (rval < 0)
399 		return rval;
400 
401 	rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
402 	if (rval < 0)
403 		return rval;
404 
405 	/* read status */
406 	rval = as3645a_get_fault(&flash->fled, &fault);
407 	if (rval < 0)
408 		return rval;
409 
410 	dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
411 		as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
412 	dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
413 		as3645a_read(flash, AS_CURRENT_SET_REG));
414 	dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
415 		as3645a_read(flash, AS_CONTROL_REG));
416 
417 	return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
418 }
419 
420 static int as3645a_detect(struct as3645a *flash)
421 {
422 	struct device *dev = &flash->client->dev;
423 	int rval, man, model, rfu, version;
424 	const char *vendor;
425 
426 	rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
427 	if (rval < 0) {
428 		dev_err(dev, "can't read design info reg\n");
429 		return rval;
430 	}
431 
432 	man = AS_DESIGN_INFO_FACTORY(rval);
433 	model = AS_DESIGN_INFO_MODEL(rval);
434 
435 	rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
436 	if (rval < 0) {
437 		dev_err(dev, "can't read version control reg\n");
438 		return rval;
439 	}
440 
441 	rfu = AS_VERSION_CONTROL_RFU(rval);
442 	version = AS_VERSION_CONTROL_VERSION(rval);
443 
444 	/* Verify the chip model and version. */
445 	if (model != 0x01 || rfu != 0x00) {
446 		dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
447 			model, rfu);
448 		return -ENODEV;
449 	}
450 
451 	switch (man) {
452 	case 1:
453 		vendor = "AMS, Austria Micro Systems";
454 		break;
455 	case 2:
456 		vendor = "ADI, Analog Devices Inc.";
457 		break;
458 	case 3:
459 		vendor = "NSC, National Semiconductor";
460 		break;
461 	case 4:
462 		vendor = "NXP";
463 		break;
464 	case 5:
465 		vendor = "TI, Texas Instrument";
466 		break;
467 	default:
468 		vendor = "Unknown";
469 	}
470 
471 	dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
472 		 man, version);
473 
474 	rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
475 	if (rval < 0)
476 		return rval;
477 
478 	return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
479 }
480 
481 static int as3645a_parse_node(struct as3645a *flash,
482 			      struct fwnode_handle *fwnode)
483 {
484 	struct as3645a_config *cfg = &flash->cfg;
485 	struct fwnode_handle *child;
486 	int rval;
487 
488 	fwnode_for_each_child_node(fwnode, child) {
489 		u32 id = 0;
490 
491 		fwnode_property_read_u32(child, "reg", &id);
492 
493 		switch (id) {
494 		case AS_LED_FLASH:
495 			flash->flash_node = child;
496 			fwnode_handle_get(child);
497 			break;
498 		case AS_LED_INDICATOR:
499 			flash->indicator_node = child;
500 			fwnode_handle_get(child);
501 			break;
502 		default:
503 			dev_warn(&flash->client->dev,
504 				 "unknown LED %u encountered, ignoring\n", id);
505 			break;
506 		}
507 	}
508 
509 	if (!flash->flash_node) {
510 		dev_err(&flash->client->dev, "can't find flash node\n");
511 		return -ENODEV;
512 	}
513 
514 	rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
515 					&cfg->flash_timeout_us);
516 	if (rval < 0) {
517 		dev_err(&flash->client->dev,
518 			"can't read flash-timeout-us property for flash\n");
519 		goto out_err;
520 	}
521 
522 	rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
523 					&cfg->flash_max_ua);
524 	if (rval < 0) {
525 		dev_err(&flash->client->dev,
526 			"can't read flash-max-microamp property for flash\n");
527 		goto out_err;
528 	}
529 
530 	rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
531 					&cfg->assist_max_ua);
532 	if (rval < 0) {
533 		dev_err(&flash->client->dev,
534 			"can't read led-max-microamp property for flash\n");
535 		goto out_err;
536 	}
537 
538 	fwnode_property_read_u32(flash->flash_node, "voltage-reference",
539 				 &cfg->voltage_reference);
540 
541 	fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
542 				 &cfg->peak);
543 	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
544 
545 	if (!flash->indicator_node) {
546 		dev_warn(&flash->client->dev,
547 			 "can't find indicator node\n");
548 		rval = -ENODEV;
549 		goto out_err;
550 	}
551 
552 
553 	rval = fwnode_property_read_u32(flash->indicator_node,
554 					"led-max-microamp",
555 					&cfg->indicator_max_ua);
556 	if (rval < 0) {
557 		dev_err(&flash->client->dev,
558 			"can't read led-max-microamp property for indicator\n");
559 		goto out_err;
560 	}
561 
562 	return 0;
563 
564 out_err:
565 	fwnode_handle_put(flash->flash_node);
566 	fwnode_handle_put(flash->indicator_node);
567 
568 	return rval;
569 }
570 
571 static int as3645a_led_class_setup(struct as3645a *flash)
572 {
573 	struct led_classdev *fled_cdev = &flash->fled.led_cdev;
574 	struct led_classdev *iled_cdev = &flash->iled_cdev;
575 	struct led_init_data init_data = {};
576 	struct led_flash_setting *cfg;
577 	int rval;
578 
579 	iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
580 	iled_cdev->max_brightness =
581 		flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
582 	iled_cdev->flags = LED_CORE_SUSPENDRESUME;
583 
584 	init_data.fwnode = flash->indicator_node;
585 	init_data.devicename = AS_NAME;
586 	init_data.default_label = "indicator";
587 
588 	rval = led_classdev_register_ext(&flash->client->dev, iled_cdev,
589 					 &init_data);
590 	if (rval < 0)
591 		return rval;
592 
593 	cfg = &flash->fled.brightness;
594 	cfg->min = AS_FLASH_INTENSITY_MIN;
595 	cfg->max = flash->cfg.flash_max_ua;
596 	cfg->step = AS_FLASH_INTENSITY_STEP;
597 	cfg->val = flash->cfg.flash_max_ua;
598 
599 	cfg = &flash->fled.timeout;
600 	cfg->min = AS_FLASH_TIMEOUT_MIN;
601 	cfg->max = flash->cfg.flash_timeout_us;
602 	cfg->step = AS_FLASH_TIMEOUT_STEP;
603 	cfg->val = flash->cfg.flash_timeout_us;
604 
605 	flash->fled.ops = &as3645a_led_flash_ops;
606 
607 	fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
608 	/* Value 0 is off in LED class. */
609 	fled_cdev->max_brightness =
610 		as3645a_current_to_reg(flash, false,
611 				       flash->cfg.assist_max_ua) + 1;
612 	fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
613 
614 	init_data.fwnode = flash->flash_node;
615 	init_data.devicename = AS_NAME;
616 	init_data.default_label = "flash";
617 
618 	rval = led_classdev_flash_register_ext(&flash->client->dev,
619 					       &flash->fled, &init_data);
620 	if (rval)
621 		goto out_err;
622 
623 	return rval;
624 
625 out_err:
626 	led_classdev_unregister(iled_cdev);
627 	dev_err(&flash->client->dev,
628 		"led_classdev_flash_register() failed, error %d\n",
629 		rval);
630 	return rval;
631 }
632 
633 static int as3645a_v4l2_setup(struct as3645a *flash)
634 {
635 	struct led_classdev_flash *fled = &flash->fled;
636 	struct led_classdev *led = &fled->led_cdev;
637 	struct v4l2_flash_config cfg = {
638 		.intensity = {
639 			.min = AS_TORCH_INTENSITY_MIN,
640 			.max = flash->cfg.assist_max_ua,
641 			.step = AS_TORCH_INTENSITY_STEP,
642 			.val = flash->cfg.assist_max_ua,
643 		},
644 	};
645 	struct v4l2_flash_config cfgind = {
646 		.intensity = {
647 			.min = AS_INDICATOR_INTENSITY_MIN,
648 			.max = flash->cfg.indicator_max_ua,
649 			.step = AS_INDICATOR_INTENSITY_STEP,
650 			.val = flash->cfg.indicator_max_ua,
651 		},
652 	};
653 
654 	strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
655 	strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
656 		sizeof(cfgind.dev_name));
657 
658 	flash->vf = v4l2_flash_init(
659 		&flash->client->dev, flash->flash_node, &flash->fled, NULL,
660 		&cfg);
661 	if (IS_ERR(flash->vf))
662 		return PTR_ERR(flash->vf);
663 
664 	flash->vfind = v4l2_flash_indicator_init(
665 		&flash->client->dev, flash->indicator_node, &flash->iled_cdev,
666 		&cfgind);
667 	if (IS_ERR(flash->vfind)) {
668 		v4l2_flash_release(flash->vf);
669 		return PTR_ERR(flash->vfind);
670 	}
671 
672 	return 0;
673 }
674 
675 static int as3645a_probe(struct i2c_client *client)
676 {
677 	struct as3645a *flash;
678 	int rval;
679 
680 	if (!dev_fwnode(&client->dev))
681 		return -ENODEV;
682 
683 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
684 	if (flash == NULL)
685 		return -ENOMEM;
686 
687 	flash->client = client;
688 
689 	rval = as3645a_parse_node(flash, dev_fwnode(&client->dev));
690 	if (rval < 0)
691 		return rval;
692 
693 	rval = as3645a_detect(flash);
694 	if (rval < 0)
695 		goto out_put_nodes;
696 
697 	mutex_init(&flash->mutex);
698 	i2c_set_clientdata(client, flash);
699 
700 	rval = as3645a_setup(flash);
701 	if (rval)
702 		goto out_mutex_destroy;
703 
704 	rval = as3645a_led_class_setup(flash);
705 	if (rval)
706 		goto out_mutex_destroy;
707 
708 	rval = as3645a_v4l2_setup(flash);
709 	if (rval)
710 		goto out_led_classdev_flash_unregister;
711 
712 	return 0;
713 
714 out_led_classdev_flash_unregister:
715 	led_classdev_flash_unregister(&flash->fled);
716 
717 out_mutex_destroy:
718 	mutex_destroy(&flash->mutex);
719 
720 out_put_nodes:
721 	fwnode_handle_put(flash->flash_node);
722 	fwnode_handle_put(flash->indicator_node);
723 
724 	return rval;
725 }
726 
727 static void as3645a_remove(struct i2c_client *client)
728 {
729 	struct as3645a *flash = i2c_get_clientdata(client);
730 
731 	as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
732 
733 	v4l2_flash_release(flash->vf);
734 	v4l2_flash_release(flash->vfind);
735 
736 	led_classdev_flash_unregister(&flash->fled);
737 	led_classdev_unregister(&flash->iled_cdev);
738 
739 	mutex_destroy(&flash->mutex);
740 
741 	fwnode_handle_put(flash->flash_node);
742 	fwnode_handle_put(flash->indicator_node);
743 }
744 
745 static const struct i2c_device_id as3645a_id_table[] = {
746 	{ AS_NAME, 0 },
747 	{ },
748 };
749 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
750 
751 static const struct of_device_id as3645a_of_table[] = {
752 	{ .compatible = "ams,as3645a" },
753 	{ },
754 };
755 MODULE_DEVICE_TABLE(of, as3645a_of_table);
756 
757 static struct i2c_driver as3645a_i2c_driver = {
758 	.driver	= {
759 		.of_match_table = as3645a_of_table,
760 		.name = AS_NAME,
761 	},
762 	.probe = as3645a_probe,
763 	.remove	= as3645a_remove,
764 	.id_table = as3645a_id_table,
765 };
766 
767 module_i2c_driver(as3645a_i2c_driver);
768 
769 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
770 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
771 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
772 MODULE_LICENSE("GPL v2");
773