text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
   *
   * Copyright (C) 2008-2011 Nokia Corporation
   * Copyright (c) 2011, 2017 Intel Corporation.
   *
   * Based on drivers/media/i2c/as3645a.c.
   *
   * Contact: Sakari Ailus <sakari.ailus@iki.fi>
   */
  
  #include <linux/delay.h>
  #include <linux/gpio/consumer.h>
  #include <linux/i2c.h>
  #include <linux/led-class-flash.h>
  #include <linux/leds.h>
  #include <linux/module.h>
  #include <linux/mutex.h>
  #include <linux/property.h>
  #include <linux/slab.h>
  
  #include <media/v4l2-flash-led-class.h>
  
  #define AS_TIMER_US_TO_CODE(t)			(((t) / 1000 - 100) / 50)
  #define AS_TIMER_CODE_TO_US(c)			((50 * (c) + 100) * 1000)
  
  /* Register definitions */
  
  /* Read-only Design info register: Reset state: xxxx 0001 */
  #define AS_DESIGN_INFO_REG			0x00
  #define AS_DESIGN_INFO_FACTORY(x)		(((x) >> 4))
  #define AS_DESIGN_INFO_MODEL(x)			((x) & 0x0f)
  
  /* Read-only Version control register: Reset state: 0000 0000
   * for first engineering samples
   */
  #define AS_VERSION_CONTROL_REG			0x01
  #define AS_VERSION_CONTROL_RFU(x)		(((x) >> 4))
  #define AS_VERSION_CONTROL_VERSION(x)		((x) & 0x0f)
  
  /* Read / Write	(Indicator and timer register): Reset state: 0000 1111 */
  #define AS_INDICATOR_AND_TIMER_REG		0x02
  #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT	0
  #define AS_INDICATOR_AND_TIMER_VREF_SHIFT	4
  #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT	6
  
  /* Read / Write	(Current set register): Reset state: 0110 1001 */
  #define AS_CURRENT_SET_REG			0x03
  #define AS_CURRENT_ASSIST_LIGHT_SHIFT		0
  #define AS_CURRENT_LED_DET_ON			(1 << 3)
  #define AS_CURRENT_FLASH_CURRENT_SHIFT		4
  
  /* Read / Write	(Control register): Reset state: 1011 0100 */
  #define AS_CONTROL_REG				0x04
  #define AS_CONTROL_MODE_SETTING_SHIFT		0
  #define AS_CONTROL_STROBE_ON			(1 << 2)
  #define AS_CONTROL_OUT_ON			(1 << 3)
  #define AS_CONTROL_EXT_TORCH_ON			(1 << 4)
  #define AS_CONTROL_STROBE_TYPE_EDGE		(0 << 5)
  #define AS_CONTROL_STROBE_TYPE_LEVEL		(1 << 5)
  #define AS_CONTROL_COIL_PEAK_SHIFT		6
  
  /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
  #define AS_FAULT_INFO_REG			0x05
  #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT	(1 << 1)
  #define AS_FAULT_INFO_INDICATOR_LED		(1 << 2)
  #define AS_FAULT_INFO_LED_AMOUNT		(1 << 3)
  #define AS_FAULT_INFO_TIMEOUT			(1 << 4)
  #define AS_FAULT_INFO_OVER_TEMPERATURE		(1 << 5)
  #define AS_FAULT_INFO_SHORT_CIRCUIT		(1 << 6)
  #define AS_FAULT_INFO_OVER_VOLTAGE		(1 << 7)
  
  /* Boost register */
  #define AS_BOOST_REG				0x0d
  #define AS_BOOST_CURRENT_DISABLE		(0 << 0)
  #define AS_BOOST_CURRENT_ENABLE			(1 << 0)
  
  /* Password register is used to unlock boost register writing */
  #define AS_PASSWORD_REG				0x0f
  #define AS_PASSWORD_UNLOCK_VALUE		0x55
  
  #define AS_NAME					"as3645a"
  #define AS_I2C_ADDR				(0x60 >> 1) /* W:0x60, R:0x61 */
  
  #define AS_FLASH_TIMEOUT_MIN			100000	/* us */
  #define AS_FLASH_TIMEOUT_MAX			850000
  #define AS_FLASH_TIMEOUT_STEP			50000
  
  #define AS_FLASH_INTENSITY_MIN			200000	/* uA */
  #define AS_FLASH_INTENSITY_MAX_1LED		500000
  #define AS_FLASH_INTENSITY_MAX_2LEDS		400000
  #define AS_FLASH_INTENSITY_STEP			20000
  
  #define AS_TORCH_INTENSITY_MIN			20000	/* uA */
  #define AS_TORCH_INTENSITY_MAX			160000
  #define AS_TORCH_INTENSITY_STEP			20000
  
  #define AS_INDICATOR_INTENSITY_MIN		0	/* uA */
  #define AS_INDICATOR_INTENSITY_MAX		10000
  #define AS_INDICATOR_INTENSITY_STEP		2500
  
  #define AS_PEAK_mA_MAX				2000
  #define AS_PEAK_mA_TO_REG(a) \
  	((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
  
  /* LED numbers for Devicetree */
  #define AS_LED_FLASH				0
  #define AS_LED_INDICATOR			1
  
  enum as_mode {
  	AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
  	AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
  	AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
  	AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
  };
  
  struct as3645a_config {
  	u32 flash_timeout_us;
  	u32 flash_max_ua;
  	u32 assist_max_ua;
  	u32 indicator_max_ua;
  	u32 voltage_reference;
  	u32 peak;
  };
  
  struct as3645a {
  	struct i2c_client *client;
  
  	struct mutex mutex;
  
  	struct led_classdev_flash fled;
  	struct led_classdev iled_cdev;
  
  	struct v4l2_flash *vf;
  	struct v4l2_flash *vfind;
  
  	struct fwnode_handle *flash_node;
  	struct fwnode_handle *indicator_node;
  
  	struct as3645a_config cfg;
  
  	enum as_mode mode;
  	unsigned int timeout;
  	unsigned int flash_current;
  	unsigned int assist_current;
  	unsigned int indicator_current;
  	enum v4l2_flash_strobe_source strobe_source;
  };
  
  #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
  #define iled_cdev_to_as3645a(__iled_cdev) \
  	container_of(__iled_cdev, struct as3645a, iled_cdev)
  
  /* Return negative errno else zero on success */
  static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
  {
  	struct i2c_client *client = flash->client;
  	int rval;
  
  	rval = i2c_smbus_write_byte_data(client, addr, val);
  
  	dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
  		rval < 0 ? "fail" : "ok");
  
  	return rval;
  }
  
  /* Return negative errno else a data byte received from the device. */
  static int as3645a_read(struct as3645a *flash, u8 addr)
  {
  	struct i2c_client *client = flash->client;
  	int rval;
  
  	rval = i2c_smbus_read_byte_data(client, addr);
  
  	dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
  		rval < 0 ? "fail" : "ok");
  
  	return rval;
  }
  
  /* -----------------------------------------------------------------------------
   * Hardware configuration and trigger
   */
  
  /**
   * as3645a_set_config - Set flash configuration registers
   * @flash: The flash
   *
   * Configure the hardware with flash, assist and indicator currents, as well as
   * flash timeout.
   *
   * Return 0 on success, or a negative error code if an I2C communication error
   * occurred.
   */
  static int as3645a_set_current(struct as3645a *flash)
  {
  	u8 val;
  
  	val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
  	    | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
  	    | AS_CURRENT_LED_DET_ON;
  
  	return as3645a_write(flash, AS_CURRENT_SET_REG, val);
  }
  
  static int as3645a_set_timeout(struct as3645a *flash)
  {
  	u8 val;
  
  	val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
  
  	val |= (flash->cfg.voltage_reference
  		<< AS_INDICATOR_AND_TIMER_VREF_SHIFT)
  	    |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
  		 << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
  
  	return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
  }
  
  /**
   * as3645a_set_control - Set flash control register
   * @flash: The flash
   * @mode: Desired output mode
   * @on: Desired output state
   *
   * Configure the hardware with output mode and state.
   *
   * Return 0 on success, or a negative error code if an I2C communication error
   * occurred.
   */
  static int
  as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
  {
  	u8 reg;
  
  	/* Configure output parameters and operation mode. */
  	reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
  	    | (on ? AS_CONTROL_OUT_ON : 0)
  	    | mode;
  
  	if (mode == AS_MODE_FLASH &&
  	    flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
  		reg |= AS_CONTROL_STROBE_TYPE_LEVEL
  		    |  AS_CONTROL_STROBE_ON;
  
  	return as3645a_write(flash, AS_CONTROL_REG, reg);
  }
  
  static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
  {
  	struct as3645a *flash = fled_to_as3645a(fled);
  	int rval;
  
  	/* NOTE: reading register clears fault status */
  	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
  	if (rval < 0)
  		return rval;
  
  	if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
  		*fault |= LED_FAULT_OVER_CURRENT;
  
  	if (rval & AS_FAULT_INFO_INDICATOR_LED)
  		*fault |= LED_FAULT_INDICATOR;
  
  	dev_dbg(&flash->client->dev, "%u connected LEDs\n",
  		rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
  
  	if (rval & AS_FAULT_INFO_TIMEOUT)
  		*fault |= LED_FAULT_TIMEOUT;
  
  	if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
  		*fault |= LED_FAULT_OVER_TEMPERATURE;
  
  	if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
  		*fault |= LED_FAULT_OVER_CURRENT;
  
  	if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
  		*fault |= LED_FAULT_INPUT_VOLTAGE;
  
  	return rval;
  }
  
  static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
  					     unsigned int step,
  					     unsigned int val)
  {
  	if (val < min)
  		val = min;
  
  	if (val > max)
  		val = max;
  
  	return (val - min) / step;
  }
  
  static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
  					   unsigned int ua)
  {
  	if (is_flash)
  		return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
  						flash->cfg.assist_max_ua,
  						AS_TORCH_INTENSITY_STEP, ua);
  	else
  		return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
  						flash->cfg.flash_max_ua,
  						AS_FLASH_INTENSITY_STEP, ua);
  }
  
  static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
  					    enum led_brightness brightness)
  {
  	struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
  	int rval;
  
  	flash->indicator_current = brightness;
  
  	rval = as3645a_set_timeout(flash);
  	if (rval)
  		return rval;
  
  	return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
  }
  
  static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
  					 enum led_brightness brightness)
  {
  	struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
  	struct as3645a *flash = fled_to_as3645a(fled);
  	int rval;
  
  	if (brightness) {
  		/* Register value 0 is 20 mA. */
  		flash->assist_current = brightness - 1;
  
  		rval = as3645a_set_current(flash);
  		if (rval)
  			return rval;
  	}
  
  	return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
  }
  
  static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
  					u32 brightness_ua)
  {
  	struct as3645a *flash = fled_to_as3645a(fled);
  
  	flash->flash_current = as3645a_current_to_reg(flash, true,
  						      brightness_ua);
  
  	return as3645a_set_current(flash);
  }
  
  static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
  				     u32 timeout_us)
  {
  	struct as3645a *flash = fled_to_as3645a(fled);
  
  	flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
  
  	return as3645a_set_timeout(flash);
  }
  
  static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
  {
  	struct as3645a *flash = fled_to_as3645a(fled);
  
  	return as3645a_set_control(flash, AS_MODE_FLASH, state);
  }
  
  static const struct led_flash_ops as3645a_led_flash_ops = {
  	.flash_brightness_set = as3645a_set_flash_brightness,
  	.timeout_set = as3645a_set_flash_timeout,
  	.strobe_set = as3645a_set_strobe,
  	.fault_get = as3645a_get_fault,
  };
  
  static int as3645a_setup(struct as3645a *flash)
  {
  	struct device *dev = &flash->client->dev;
  	u32 fault = 0;
  	int rval;
  
  	/* clear errors */
  	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
  	if (rval < 0)
  		return rval;
  
  	dev_dbg(dev, "Fault info: %02x\n", rval);
  
  	rval = as3645a_set_current(flash);
  	if (rval < 0)
  		return rval;
  
  	rval = as3645a_set_timeout(flash);
  	if (rval < 0)
  		return rval;
  
  	rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
  	if (rval < 0)
  		return rval;
  
  	/* read status */
  	rval = as3645a_get_fault(&flash->fled, &fault);
  	if (rval < 0)
  		return rval;
  
  	dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
  		as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
  	dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
  		as3645a_read(flash, AS_CURRENT_SET_REG));
  	dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
  		as3645a_read(flash, AS_CONTROL_REG));
  
  	return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
  }
  
  static int as3645a_detect(struct as3645a *flash)
  {
  	struct device *dev = &flash->client->dev;
  	int rval, man, model, rfu, version;
  	const char *vendor;
  
  	rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
  	if (rval < 0) {
  		dev_err(dev, "can't read design info reg\n");
  		return rval;
  	}
  
  	man = AS_DESIGN_INFO_FACTORY(rval);
  	model = AS_DESIGN_INFO_MODEL(rval);
  
  	rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
  	if (rval < 0) {
  		dev_err(dev, "can't read version control reg\n");
  		return rval;
  	}
  
  	rfu = AS_VERSION_CONTROL_RFU(rval);
  	version = AS_VERSION_CONTROL_VERSION(rval);
  
  	/* Verify the chip model and version. */
  	if (model != 0x01 || rfu != 0x00) {
  		dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
  			model, rfu);
  		return -ENODEV;
  	}
  
  	switch (man) {
  	case 1:
  		vendor = "AMS, Austria Micro Systems";
  		break;
  	case 2:
  		vendor = "ADI, Analog Devices Inc.";
  		break;
  	case 3:
  		vendor = "NSC, National Semiconductor";
  		break;
  	case 4:
  		vendor = "NXP";
  		break;
  	case 5:
  		vendor = "TI, Texas Instrument";
  		break;
  	default:
  		vendor = "Unknown";
  	}
  
  	dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
  		 man, version);
  
  	rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
  	if (rval < 0)
  		return rval;
  
  	return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
  }
  
  static int as3645a_parse_node(struct as3645a *flash,
  			      struct fwnode_handle *fwnode)
  {
  	struct as3645a_config *cfg = &flash->cfg;
  	struct fwnode_handle *child;
  	int rval;
  
  	fwnode_for_each_child_node(fwnode, child) {
  		u32 id = 0;
  
  		fwnode_property_read_u32(child, "reg", &id);
  
  		switch (id) {
  		case AS_LED_FLASH:
  			flash->flash_node = child;
  			break;
  		case AS_LED_INDICATOR:
  			flash->indicator_node = child;
  			break;
  		default:
  			dev_warn(&flash->client->dev,
  				 "unknown LED %u encountered, ignoring\n", id);
  			break;
  		}
  		fwnode_handle_get(child);
  	}
  
  	if (!flash->flash_node) {
  		dev_err(&flash->client->dev, "can't find flash node\n");
  		return -ENODEV;
  	}
  
  	rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
  					&cfg->flash_timeout_us);
  	if (rval < 0) {
  		dev_err(&flash->client->dev,
  			"can't read flash-timeout-us property for flash\n");
  		goto out_err;
  	}
  
  	rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
  					&cfg->flash_max_ua);
  	if (rval < 0) {
  		dev_err(&flash->client->dev,
  			"can't read flash-max-microamp property for flash\n");
  		goto out_err;
  	}
  
  	rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
  					&cfg->assist_max_ua);
  	if (rval < 0) {
  		dev_err(&flash->client->dev,
  			"can't read led-max-microamp property for flash\n");
  		goto out_err;
  	}
  
  	fwnode_property_read_u32(flash->flash_node, "voltage-reference",
  				 &cfg->voltage_reference);
  
  	fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
  				 &cfg->peak);
  	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
  
  	if (!flash->indicator_node) {
  		dev_warn(&flash->client->dev,
  			 "can't find indicator node\n");
  		goto out_err;
  	}
  
  
  	rval = fwnode_property_read_u32(flash->indicator_node,
  					"led-max-microamp",
  					&cfg->indicator_max_ua);
  	if (rval < 0) {
  		dev_err(&flash->client->dev,
  			"can't read led-max-microamp property for indicator\n");
  		goto out_err;
  	}
  
  	return 0;
  
  out_err:
  	fwnode_handle_put(flash->flash_node);
  	fwnode_handle_put(flash->indicator_node);
  
  	return rval;
  }
  
  static int as3645a_led_class_setup(struct as3645a *flash)
  {
  	struct led_classdev *fled_cdev = &flash->fled.led_cdev;
  	struct led_classdev *iled_cdev = &flash->iled_cdev;
  	struct led_init_data init_data = {};
  	struct led_flash_setting *cfg;
  	int rval;
  
  	iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
  	iled_cdev->max_brightness =
  		flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
  	iled_cdev->flags = LED_CORE_SUSPENDRESUME;
  
  	init_data.fwnode = flash->indicator_node;
  	init_data.devicename = AS_NAME;
  	init_data.default_label = "indicator";
  
  	rval = led_classdev_register_ext(&flash->client->dev, iled_cdev,
  					 &init_data);
  	if (rval < 0)
  		return rval;
  
  	cfg = &flash->fled.brightness;
  	cfg->min = AS_FLASH_INTENSITY_MIN;
  	cfg->max = flash->cfg.flash_max_ua;
  	cfg->step = AS_FLASH_INTENSITY_STEP;
  	cfg->val = flash->cfg.flash_max_ua;
  
  	cfg = &flash->fled.timeout;
  	cfg->min = AS_FLASH_TIMEOUT_MIN;
  	cfg->max = flash->cfg.flash_timeout_us;
  	cfg->step = AS_FLASH_TIMEOUT_STEP;
  	cfg->val = flash->cfg.flash_timeout_us;
  
  	flash->fled.ops = &as3645a_led_flash_ops;
  
  	fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
  	/* Value 0 is off in LED class. */
  	fled_cdev->max_brightness =
  		as3645a_current_to_reg(flash, false,
  				       flash->cfg.assist_max_ua) + 1;
  	fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
  
  	init_data.fwnode = flash->flash_node;
  	init_data.devicename = AS_NAME;
  	init_data.default_label = "flash";
  
  	rval = led_classdev_flash_register_ext(&flash->client->dev,
  					       &flash->fled, &init_data);
  	if (rval)
  		goto out_err;
  
  	return rval;
  
  out_err:
  	led_classdev_unregister(iled_cdev);
  	dev_err(&flash->client->dev,
  		"led_classdev_flash_register() failed, error %d\n",
  		rval);
  	return rval;
  }
  
  static int as3645a_v4l2_setup(struct as3645a *flash)
  {
  	struct led_classdev_flash *fled = &flash->fled;
  	struct led_classdev *led = &fled->led_cdev;
  	struct v4l2_flash_config cfg = {
  		.intensity = {
  			.min = AS_TORCH_INTENSITY_MIN,
  			.max = flash->cfg.assist_max_ua,
  			.step = AS_TORCH_INTENSITY_STEP,
  			.val = flash->cfg.assist_max_ua,
  		},
  	};
  	struct v4l2_flash_config cfgind = {
  		.intensity = {
  			.min = AS_INDICATOR_INTENSITY_MIN,
  			.max = flash->cfg.indicator_max_ua,
  			.step = AS_INDICATOR_INTENSITY_STEP,
  			.val = flash->cfg.indicator_max_ua,
  		},
  	};
  
  	strlcpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
  	strlcpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
  		sizeof(cfgind.dev_name));
  
  	flash->vf = v4l2_flash_init(
  		&flash->client->dev, flash->flash_node, &flash->fled, NULL,
  		&cfg);
  	if (IS_ERR(flash->vf))
  		return PTR_ERR(flash->vf);
  
  	flash->vfind = v4l2_flash_indicator_init(
  		&flash->client->dev, flash->indicator_node, &flash->iled_cdev,
  		&cfgind);
  	if (IS_ERR(flash->vfind)) {
  		v4l2_flash_release(flash->vf);
  		return PTR_ERR(flash->vfind);
  	}
  
  	return 0;
  }
  
  static int as3645a_probe(struct i2c_client *client)
  {
  	struct as3645a *flash;
  	int rval;
  
  	if (!dev_fwnode(&client->dev))
  		return -ENODEV;
  
  	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
  	if (flash == NULL)
  		return -ENOMEM;
  
  	flash->client = client;
  
  	rval = as3645a_parse_node(flash, dev_fwnode(&client->dev));
  	if (rval < 0)
  		return rval;
  
  	rval = as3645a_detect(flash);
  	if (rval < 0)
  		goto out_put_nodes;
  
  	mutex_init(&flash->mutex);
  	i2c_set_clientdata(client, flash);
  
  	rval = as3645a_setup(flash);
  	if (rval)
  		goto out_mutex_destroy;
  
  	rval = as3645a_led_class_setup(flash);
  	if (rval)
  		goto out_mutex_destroy;
  
  	rval = as3645a_v4l2_setup(flash);
  	if (rval)
  		goto out_led_classdev_flash_unregister;
  
  	return 0;
  
  out_led_classdev_flash_unregister:
  	led_classdev_flash_unregister(&flash->fled);
  
  out_mutex_destroy:
  	mutex_destroy(&flash->mutex);
  
  out_put_nodes:
  	fwnode_handle_put(flash->flash_node);
  	fwnode_handle_put(flash->indicator_node);
  
  	return rval;
  }
  
  static int as3645a_remove(struct i2c_client *client)
  {
  	struct as3645a *flash = i2c_get_clientdata(client);
  
  	as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
  
  	v4l2_flash_release(flash->vf);
  	v4l2_flash_release(flash->vfind);
  
  	led_classdev_flash_unregister(&flash->fled);
  	led_classdev_unregister(&flash->iled_cdev);
  
  	mutex_destroy(&flash->mutex);
  
  	fwnode_handle_put(flash->flash_node);
  	fwnode_handle_put(flash->indicator_node);
  
  	return 0;
  }
  
  static const struct i2c_device_id as3645a_id_table[] = {
  	{ AS_NAME, 0 },
  	{ },
  };
  MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
  
  static const struct of_device_id as3645a_of_table[] = {
  	{ .compatible = "ams,as3645a" },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, as3645a_of_table);
  
  static struct i2c_driver as3645a_i2c_driver = {
  	.driver	= {
  		.of_match_table = as3645a_of_table,
  		.name = AS_NAME,
  	},
  	.probe_new	= as3645a_probe,
  	.remove	= as3645a_remove,
  	.id_table = as3645a_id_table,
  };
  
  module_i2c_driver(as3645a_i2c_driver);
  
  MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
  MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
  MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
  MODULE_LICENSE("GPL v2");
  