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
111enum 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
118struct 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
127struct 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 */
156static 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. */
170static 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 */
197static 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
208static 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 */
233static int
234as3645a_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
251static 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
285static 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
298static 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
311static 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
326static 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
345static 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
356static 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
366static 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
373static 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
380static 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
420static 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
481static int as3645a_parse_node(struct device *dev, struct as3645a *flash)
482{
483	struct as3645a_config *cfg = &flash->cfg;
484	int rval;
485
486	device_for_each_child_node_scoped(dev, child) {
487		u32 id = 0;
488
489		fwnode_property_read_u32(child, "reg", &id);
490
491		switch (id) {
492		case AS_LED_FLASH:
493			flash->flash_node = child;
494			fwnode_handle_get(child);
495			break;
496		case AS_LED_INDICATOR:
497			flash->indicator_node = child;
498			fwnode_handle_get(child);
499			break;
500		default:
501			dev_warn(&flash->client->dev,
502				 "unknown LED %u encountered, ignoring\n", id);
503			break;
504		}
505	}
506
507	if (!flash->flash_node) {
508		dev_err(&flash->client->dev, "can't find flash node\n");
509		return -ENODEV;
510	}
511
512	rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
513					&cfg->flash_timeout_us);
514	if (rval < 0) {
515		dev_err(&flash->client->dev,
516			"can't read flash-timeout-us property for flash\n");
517		goto out_err;
518	}
519
520	rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
521					&cfg->flash_max_ua);
522	if (rval < 0) {
523		dev_err(&flash->client->dev,
524			"can't read flash-max-microamp property for flash\n");
525		goto out_err;
526	}
527
528	rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
529					&cfg->assist_max_ua);
530	if (rval < 0) {
531		dev_err(&flash->client->dev,
532			"can't read led-max-microamp property for flash\n");
533		goto out_err;
534	}
535
536	fwnode_property_read_u32(flash->flash_node, "voltage-reference",
537				 &cfg->voltage_reference);
538
539	fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
540				 &cfg->peak);
541	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
542
543	if (!flash->indicator_node) {
544		dev_warn(&flash->client->dev,
545			 "can't find indicator node\n");
546		rval = -ENODEV;
547		goto out_err;
548	}
549
550
551	rval = fwnode_property_read_u32(flash->indicator_node,
552					"led-max-microamp",
553					&cfg->indicator_max_ua);
554	if (rval < 0) {
555		dev_err(&flash->client->dev,
556			"can't read led-max-microamp property for indicator\n");
557		goto out_err;
558	}
559
560	return 0;
561
562out_err:
563	fwnode_handle_put(flash->flash_node);
564	fwnode_handle_put(flash->indicator_node);
565
566	return rval;
567}
568
569static int as3645a_led_class_setup(struct as3645a *flash)
570{
571	struct led_classdev *fled_cdev = &flash->fled.led_cdev;
572	struct led_classdev *iled_cdev = &flash->iled_cdev;
573	struct led_init_data init_data = {};
574	struct led_flash_setting *cfg;
575	int rval;
576
577	iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
578	iled_cdev->max_brightness =
579		flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
580	iled_cdev->flags = LED_CORE_SUSPENDRESUME;
581
582	init_data.fwnode = flash->indicator_node;
583	init_data.devicename = AS_NAME;
584	init_data.default_label = "indicator";
585
586	rval = led_classdev_register_ext(&flash->client->dev, iled_cdev,
587					 &init_data);
588	if (rval < 0)
589		return rval;
590
591	cfg = &flash->fled.brightness;
592	cfg->min = AS_FLASH_INTENSITY_MIN;
593	cfg->max = flash->cfg.flash_max_ua;
594	cfg->step = AS_FLASH_INTENSITY_STEP;
595	cfg->val = flash->cfg.flash_max_ua;
596
597	cfg = &flash->fled.timeout;
598	cfg->min = AS_FLASH_TIMEOUT_MIN;
599	cfg->max = flash->cfg.flash_timeout_us;
600	cfg->step = AS_FLASH_TIMEOUT_STEP;
601	cfg->val = flash->cfg.flash_timeout_us;
602
603	flash->fled.ops = &as3645a_led_flash_ops;
604
605	fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
606	/* Value 0 is off in LED class. */
607	fled_cdev->max_brightness =
608		as3645a_current_to_reg(flash, false,
609				       flash->cfg.assist_max_ua) + 1;
610	fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
611
612	init_data.fwnode = flash->flash_node;
613	init_data.devicename = AS_NAME;
614	init_data.default_label = "flash";
615
616	rval = led_classdev_flash_register_ext(&flash->client->dev,
617					       &flash->fled, &init_data);
618	if (rval)
619		goto out_err;
620
621	return rval;
622
623out_err:
624	led_classdev_unregister(iled_cdev);
625	dev_err(&flash->client->dev,
626		"led_classdev_flash_register() failed, error %d\n",
627		rval);
628	return rval;
629}
630
631static int as3645a_v4l2_setup(struct as3645a *flash)
632{
633	struct led_classdev_flash *fled = &flash->fled;
634	struct led_classdev *led = &fled->led_cdev;
635	struct v4l2_flash_config cfg = {
636		.intensity = {
637			.min = AS_TORCH_INTENSITY_MIN,
638			.max = flash->cfg.assist_max_ua,
639			.step = AS_TORCH_INTENSITY_STEP,
640			.val = flash->cfg.assist_max_ua,
641		},
642	};
643	struct v4l2_flash_config cfgind = {
644		.intensity = {
645			.min = AS_INDICATOR_INTENSITY_MIN,
646			.max = flash->cfg.indicator_max_ua,
647			.step = AS_INDICATOR_INTENSITY_STEP,
648			.val = flash->cfg.indicator_max_ua,
649		},
650	};
651
652	strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
653	strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
654		sizeof(cfgind.dev_name));
655
656	flash->vf = v4l2_flash_init(
657		&flash->client->dev, flash->flash_node, &flash->fled, NULL,
658		&cfg);
659	if (IS_ERR(flash->vf))
660		return PTR_ERR(flash->vf);
661
662	flash->vfind = v4l2_flash_indicator_init(
663		&flash->client->dev, flash->indicator_node, &flash->iled_cdev,
664		&cfgind);
665	if (IS_ERR(flash->vfind)) {
666		v4l2_flash_release(flash->vf);
667		return PTR_ERR(flash->vfind);
668	}
669
670	return 0;
671}
672
673static int as3645a_probe(struct i2c_client *client)
674{
675	struct as3645a *flash;
676	int rval;
677
678	if (!dev_fwnode(&client->dev))
679		return -ENODEV;
680
681	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
682	if (flash == NULL)
683		return -ENOMEM;
684
685	flash->client = client;
686
687	rval = as3645a_parse_node(&client->dev, flash);
688	if (rval < 0)
689		return rval;
690
691	rval = as3645a_detect(flash);
692	if (rval < 0)
693		goto out_put_nodes;
694
695	mutex_init(&flash->mutex);
696	i2c_set_clientdata(client, flash);
697
698	rval = as3645a_setup(flash);
699	if (rval)
700		goto out_mutex_destroy;
701
702	rval = as3645a_led_class_setup(flash);
703	if (rval)
704		goto out_mutex_destroy;
705
706	rval = as3645a_v4l2_setup(flash);
707	if (rval)
708		goto out_led_classdev_flash_unregister;
709
710	return 0;
711
712out_led_classdev_flash_unregister:
713	led_classdev_flash_unregister(&flash->fled);
714
715out_mutex_destroy:
716	mutex_destroy(&flash->mutex);
717
718out_put_nodes:
719	fwnode_handle_put(flash->flash_node);
720	fwnode_handle_put(flash->indicator_node);
721
722	return rval;
723}
724
725static void as3645a_remove(struct i2c_client *client)
726{
727	struct as3645a *flash = i2c_get_clientdata(client);
728
729	as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
730
731	v4l2_flash_release(flash->vf);
732	v4l2_flash_release(flash->vfind);
733
734	led_classdev_flash_unregister(&flash->fled);
735	led_classdev_unregister(&flash->iled_cdev);
736
737	mutex_destroy(&flash->mutex);
738
739	fwnode_handle_put(flash->flash_node);
740	fwnode_handle_put(flash->indicator_node);
741}
742
743static const struct i2c_device_id as3645a_id_table[] = {
744	{ AS_NAME },
745	{ }
746};
747MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
748
749static const struct of_device_id as3645a_of_table[] = {
750	{ .compatible = "ams,as3645a" },
751	{ },
752};
753MODULE_DEVICE_TABLE(of, as3645a_of_table);
754
755static struct i2c_driver as3645a_i2c_driver = {
756	.driver	= {
757		.of_match_table = as3645a_of_table,
758		.name = AS_NAME,
759	},
760	.probe = as3645a_probe,
761	.remove	= as3645a_remove,
762	.id_table = as3645a_id_table,
763};
764
765module_i2c_driver(as3645a_i2c_driver);
766
767MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
768MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
769MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
770MODULE_LICENSE("GPL v2");