drivers/leds/flash/leds-rt8515.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * LED driver for Richtek RT8515 flash/torch white LEDs
  * found on some Samsung mobile phones.
  *
  * This is a 1.5A Boost dual channel driver produced around 2011.
  *
  * The component lacks a datasheet, but in the schematic picture
  * from the LG P970 service manual you can see the connections
  * from the RT8515 to the LED, with two resistors connected
  * from the pins "RFS" and "RTS" to ground.
  *
  * On the LG P970:
  * RFS (resistance flash setting?) is 20 kOhm
  * RTS (resistance torch setting?) is 39 kOhm
  *
  * Some sleuthing finds us the RT9387A which we have a datasheet for:
  * https://static5.arrow.com/pdfs/2014/7/27/8/21/12/794/rtt_/manual/94download_ds.jspprt9387a.jspprt9387a.pdf
  * This apparently works the same way so in theory this driver
  * should cover RT9387A as well. This has not been tested, please
  * update the compatibles if you add RT9387A support.
  *
  * Linus Walleij <linus.walleij@linaro.org>
  */
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/led-class-flash.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>

 #include <media/v4l2-flash-led-class.h>

 /* We can provide 15-700 mA out to the LED */
 #define RT8515_MIN_IOUT_MA	15
 #define RT8515_MAX_IOUT_MA	700
 /* The maximum intensity is 1-16 for flash and 1-100 for torch */
 #define RT8515_FLASH_MAX	16
 #define RT8515_TORCH_MAX	100

 #define RT8515_TIMEOUT_US	250000U
 #define RT8515_MAX_TIMEOUT_US	300000U

 struct rt8515 {
 	struct led_classdev_flash fled;
 	struct device *dev;
 	struct v4l2_flash *v4l2_flash;
 	struct mutex lock;
 	struct regulator *reg;
 	struct gpio_desc *enable_torch;
 	struct gpio_desc *enable_flash;
 	struct timer_list powerdown_timer;
 	u32 max_timeout; /* Flash max timeout */
 	int flash_max_intensity;
 	int torch_max_intensity;
 };

 static struct rt8515 *to_rt8515(struct led_classdev_flash *fled)
 {
 	return container_of(fled, struct rt8515, fled);
 }

 static void rt8515_gpio_led_off(struct rt8515 *rt)
 {
 	gpiod_set_value(rt->enable_flash, 0);
 	gpiod_set_value(rt->enable_torch, 0);
 }

 static void rt8515_gpio_brightness_commit(struct gpio_desc *gpiod,
 					  int brightness)
 {
 	int i;

 	/*
 	 * Toggling a GPIO line with a small delay increases the
 	 * brightness one step at a time.
 	 */
 	for (i = 0; i < brightness; i++) {
 		gpiod_set_value(gpiod, 0);
 		udelay(1);
 		gpiod_set_value(gpiod, 1);
 		udelay(1);
 	}
 }

 /* This is setting the torch light level */
 static int rt8515_led_brightness_set(struct led_classdev *led,
 				     enum led_brightness brightness)
 {
 	struct led_classdev_flash *fled = lcdev_to_flcdev(led);
 	struct rt8515 *rt = to_rt8515(fled);

 	mutex_lock(&rt->lock);

 	if (brightness == LED_OFF) {
 		/* Off */
 		rt8515_gpio_led_off(rt);
 	} else if (brightness < RT8515_TORCH_MAX) {
 		/* Step it up to movie mode brightness using the flash pin */
 		rt8515_gpio_brightness_commit(rt->enable_torch, brightness);
 	} else {
 		/* Max torch brightness requested */
 		gpiod_set_value(rt->enable_torch, 1);
 	}

 	mutex_unlock(&rt->lock);

 	return 0;
 }

 static int rt8515_led_flash_strobe_set(struct led_classdev_flash *fled,
 				       bool state)
 {
 	struct rt8515 *rt = to_rt8515(fled);
 	struct led_flash_setting *timeout = &fled->timeout;
 	int brightness = rt->flash_max_intensity;

 	mutex_lock(&rt->lock);

 	if (state) {
 		/* Enable LED flash mode and set brightness */
 		rt8515_gpio_brightness_commit(rt->enable_flash, brightness);
 		/* Set timeout */
 		mod_timer(&rt->powerdown_timer,
 			  jiffies + usecs_to_jiffies(timeout->val));
 	} else {
 		del_timer_sync(&rt->powerdown_timer);
 		/* Turn the LED off */
 		rt8515_gpio_led_off(rt);
 	}

 	fled->led_cdev.brightness = LED_OFF;
 	/* After this the torch LED will be disabled */

 	mutex_unlock(&rt->lock);

 	return 0;
 }

 static int rt8515_led_flash_strobe_get(struct led_classdev_flash *fled,
 				       bool *state)
 {
 	struct rt8515 *rt = to_rt8515(fled);

 	*state = timer_pending(&rt->powerdown_timer);

 	return 0;
 }

 static int rt8515_led_flash_timeout_set(struct led_classdev_flash *fled,
 					u32 timeout)
 {
 	/* The timeout is stored in the led-class-flash core */
 	return 0;
 }

 static const struct led_flash_ops rt8515_flash_ops = {
 	.strobe_set = rt8515_led_flash_strobe_set,
 	.strobe_get = rt8515_led_flash_strobe_get,
 	.timeout_set = rt8515_led_flash_timeout_set,
 };

 static void rt8515_powerdown_timer(struct timer_list *t)
 {
 	struct rt8515 *rt = from_timer(rt, t, powerdown_timer);

 	/* Turn the LED off */
 	rt8515_gpio_led_off(rt);
 }

 static void rt8515_init_flash_timeout(struct rt8515 *rt)
 {
 	struct led_classdev_flash *fled = &rt->fled;
 	struct led_flash_setting *s;

 	/* Init flash timeout setting */
 	s = &fled->timeout;
 	s->min = 1;
 	s->max = rt->max_timeout;
 	s->step = 1;
 	/*
 	 * Set default timeout to RT8515_TIMEOUT_US except if
 	 * max_timeout from DT is lower.
 	 */
 	s->val = min(rt->max_timeout, RT8515_TIMEOUT_US);
 }

 #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
 /* Configure the V2L2 flash subdevice */
 static void rt8515_init_v4l2_flash_config(struct rt8515 *rt,
 					  struct v4l2_flash_config *v4l2_sd_cfg)
 {
 	struct led_classdev *led = &rt->fled.led_cdev;
 	struct led_flash_setting *s;

 	strscpy(v4l2_sd_cfg->dev_name, led->dev->kobj.name,
 		sizeof(v4l2_sd_cfg->dev_name));

 	/*
 	 * Init flash intensity setting: this is a linear scale
 	 * capped from the device tree max intensity setting
 	 * 1..flash_max_intensity
 	 */
 	s = &v4l2_sd_cfg->intensity;
 	s->min = 1;
 	s->max = rt->flash_max_intensity;
 	s->step = 1;
 	s->val = s->max;
 }

 static void rt8515_v4l2_flash_release(struct rt8515 *rt)
 {
 	v4l2_flash_release(rt->v4l2_flash);
 }

 #else
 static void rt8515_init_v4l2_flash_config(struct rt8515 *rt,
 					  struct v4l2_flash_config *v4l2_sd_cfg)
 {
 }

 static void rt8515_v4l2_flash_release(struct rt8515 *rt)
 {
 }
 #endif

 static void rt8515_determine_max_intensity(struct rt8515 *rt,
 					   struct fwnode_handle *led,
 					   const char *resistance,
 					   const char *max_ua_prop, int hw_max,
 					   int *max_intensity_setting)
 {
 	u32 res = 0; /* Can't be 0 so 0 is undefined */
 	u32 ua;
 	u32 max_ma;
 	int max_intensity;
 	int ret;

 	fwnode_property_read_u32(rt->dev->fwnode, resistance, &res);
 	ret = fwnode_property_read_u32(led, max_ua_prop, &ua);

 	/* Missing info in DT, OK go with hardware maxima */
 	if (ret || res == 0) {
 		dev_err(rt->dev,
 			"either %s or %s missing from DT, using HW max\n",
 			resistance, max_ua_prop);
 		max_ma = RT8515_MAX_IOUT_MA;
 		max_intensity = hw_max;
 		goto out_assign_max;
 	}

 	/*
 	 * Formula from the datasheet, this is the maximum current
 	 * defined by the hardware.
 	 */
 	max_ma = (5500 * 1000) / res;
 	/*
 	 * Calculate max intensity (linear scaling)
 	 * Formula is ((ua / 1000) / max_ma) * 100, then simplified
 	 */
 	max_intensity = (ua / 10) / max_ma;

 	dev_info(rt->dev,
 		 "current restricted from %u to %u mA, max intensity %d/100\n",
 		 max_ma, (ua / 1000), max_intensity);

 out_assign_max:
 	dev_info(rt->dev, "max intensity %d/%d = %d mA\n",
 		 max_intensity, hw_max, max_ma);
 	*max_intensity_setting = max_intensity;
 }

 static int rt8515_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct fwnode_handle *child;
 	struct rt8515 *rt;
 	struct led_classdev *led;
 	struct led_classdev_flash *fled;
 	struct led_init_data init_data = {};
 	struct v4l2_flash_config v4l2_sd_cfg = {};
 	int ret;

 	rt = devm_kzalloc(dev, sizeof(*rt), GFP_KERNEL);
 	if (!rt)
 		return -ENOMEM;

 	rt->dev = dev;
 	fled = &rt->fled;
 	led = &fled->led_cdev;

 	/* ENF - Enable Flash line */
 	rt->enable_flash = devm_gpiod_get(dev, "enf", GPIOD_OUT_LOW);
 	if (IS_ERR(rt->enable_flash))
 		return dev_err_probe(dev, PTR_ERR(rt->enable_flash),
 				     "cannot get ENF (enable flash) GPIO\n");

 	/* ENT - Enable Torch line */
 	rt->enable_torch = devm_gpiod_get(dev, "ent", GPIOD_OUT_LOW);
 	if (IS_ERR(rt->enable_torch))
 		return dev_err_probe(dev, PTR_ERR(rt->enable_torch),
 				     "cannot get ENT (enable torch) GPIO\n");

 	child = fwnode_get_next_available_child_node(dev->fwnode, NULL);
 	if (!child) {
 		dev_err(dev,
 			"No fwnode child node found for connected LED.\n");
 		return -EINVAL;
 	}
 	init_data.fwnode = child;

 	rt8515_determine_max_intensity(rt, child, "richtek,rfs-ohms",
 				       "flash-max-microamp",
 				       RT8515_FLASH_MAX,
 				       &rt->flash_max_intensity);
 	rt8515_determine_max_intensity(rt, child, "richtek,rts-ohms",
 				       "led-max-microamp",
 				       RT8515_TORCH_MAX,
 				       &rt->torch_max_intensity);

 	ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
 				       &rt->max_timeout);
 	if (ret) {
 		rt->max_timeout = RT8515_MAX_TIMEOUT_US;
 		dev_warn(dev,
 			 "flash-max-timeout-us property missing\n");
 	}
 	timer_setup(&rt->powerdown_timer, rt8515_powerdown_timer, 0);
 	rt8515_init_flash_timeout(rt);

 	fled->ops = &rt8515_flash_ops;

 	led->max_brightness = rt->torch_max_intensity;
 	led->brightness_set_blocking = rt8515_led_brightness_set;
 	led->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;

 	mutex_init(&rt->lock);

 	platform_set_drvdata(pdev, rt);

 	ret = devm_led_classdev_flash_register_ext(dev, fled, &init_data);
 	if (ret) {
 		fwnode_handle_put(child);
 		mutex_destroy(&rt->lock);
 		dev_err(dev, "can't register LED %s\n", led->name);
 		return ret;
 	}

 	rt8515_init_v4l2_flash_config(rt, &v4l2_sd_cfg);

 	/* Create a V4L2 Flash device if V4L2 flash is enabled */
 	rt->v4l2_flash = v4l2_flash_init(dev, child, fled, NULL, &v4l2_sd_cfg);
 	if (IS_ERR(rt->v4l2_flash)) {
 		ret = PTR_ERR(rt->v4l2_flash);
 		dev_err(dev, "failed to register V4L2 flash device (%d)\n",
 			ret);
 		/*
 		 * Continue without the V4L2 flash
 		 * (we still have the classdev)
 		 */
 	}

 	fwnode_handle_put(child);
 	return 0;
 }

 static int rt8515_remove(struct platform_device *pdev)
 {
 	struct rt8515 *rt = platform_get_drvdata(pdev);

 	rt8515_v4l2_flash_release(rt);
 	del_timer_sync(&rt->powerdown_timer);
 	mutex_destroy(&rt->lock);

 	return 0;
 }

 static const struct of_device_id rt8515_match[] = {
 	{ .compatible = "richtek,rt8515", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rt8515_match);

 static struct platform_driver rt8515_driver = {
 	.driver = {
 		.name  = "rt8515",
 		.of_match_table = rt8515_match,
 	},
 	.probe  = rt8515_probe,
 	.remove = rt8515_remove,
 };
 module_platform_driver(rt8515_driver);

 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
 MODULE_DESCRIPTION("Richtek RT8515 LED driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* LED driver for Richtek RT8515 flash/torch white LEDs
	* found on some Samsung mobile phones.
	*
	* This is a 1.5A Boost dual channel driver produced around 2011.
	*
	* The component lacks a datasheet, but in the schematic picture
	* from the LG P970 service manual you can see the connections
	* from the RT8515 to the LED, with two resistors connected
	* from the pins "RFS" and "RTS" to ground.
	*
	* On the LG P970:
	* RFS (resistance flash setting?) is 20 kOhm
	* RTS (resistance torch setting?) is 39 kOhm
	*
	* Some sleuthing finds us the RT9387A which we have a datasheet for:
	* https://static5.arrow.com/pdfs/2014/7/27/8/21/12/794/rtt_/manual/94download_ds.jspprt9387a.jspprt9387a.pdf
	* This apparently works the same way so in theory this driver
	* should cover RT9387A as well. This has not been tested, please
	* update the compatibles if you add RT9387A support.
	*
	* Linus Walleij <linus.walleij@linaro.org>
	*/
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/gpio/consumer.h>
	#include <linux/led-class-flash.h>
	#include <linux/mod_devicetable.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/property.h>
	#include <linux/regulator/consumer.h>

	#include <media/v4l2-flash-led-class.h>

	/* We can provide 15-700 mA out to the LED */
	#define RT8515_MIN_IOUT_MA 15
	#define RT8515_MAX_IOUT_MA 700
	/* The maximum intensity is 1-16 for flash and 1-100 for torch */
	#define RT8515_FLASH_MAX 16
	#define RT8515_TORCH_MAX 100

	#define RT8515_TIMEOUT_US 250000U
	#define RT8515_MAX_TIMEOUT_US 300000U

	struct rt8515 {
	struct led_classdev_flash fled;
	struct device *dev;
	struct v4l2_flash *v4l2_flash;
	struct mutex lock;
	struct regulator *reg;
	struct gpio_desc *enable_torch;
	struct gpio_desc *enable_flash;
	struct timer_list powerdown_timer;
	u32 max_timeout; /* Flash max timeout */
	int flash_max_intensity;
	int torch_max_intensity;
	};

	static struct rt8515 to_rt8515(struct led_classdev_flash fled)
	{
	return container_of(fled, struct rt8515, fled);
	}

	static void rt8515_gpio_led_off(struct rt8515 *rt)
	{
	gpiod_set_value(rt->enable_flash, 0);
	gpiod_set_value(rt->enable_torch, 0);
	}

	static void rt8515_gpio_brightness_commit(struct gpio_desc *gpiod,
	int brightness)
	{
	int i;

	/*
	* Toggling a GPIO line with a small delay increases the
	* brightness one step at a time.
	*/
	for (i = 0; i < brightness; i++) {
	gpiod_set_value(gpiod, 0);
	udelay(1);
	gpiod_set_value(gpiod, 1);
	udelay(1);
	}
	}

	/* This is setting the torch light level */
	static int rt8515_led_brightness_set(struct led_classdev *led,
	enum led_brightness brightness)
	{
	struct led_classdev_flash *fled = lcdev_to_flcdev(led);
	struct rt8515 *rt = to_rt8515(fled);

	mutex_lock(&rt->lock);

	if (brightness == LED_OFF) {
	/* Off */
	rt8515_gpio_led_off(rt);
	} else if (brightness < RT8515_TORCH_MAX) {
	/* Step it up to movie mode brightness using the flash pin */
	rt8515_gpio_brightness_commit(rt->enable_torch, brightness);
	} else {
	/* Max torch brightness requested */
	gpiod_set_value(rt->enable_torch, 1);
	}

	mutex_unlock(&rt->lock);

	return 0;
	}

	static int rt8515_led_flash_strobe_set(struct led_classdev_flash *fled,
	bool state)
	{
	struct rt8515 *rt = to_rt8515(fled);
	struct led_flash_setting *timeout = &fled->timeout;
	int brightness = rt->flash_max_intensity;

	mutex_lock(&rt->lock);

	if (state) {
	/* Enable LED flash mode and set brightness */
	rt8515_gpio_brightness_commit(rt->enable_flash, brightness);
	/* Set timeout */
	mod_timer(&rt->powerdown_timer,
	jiffies + usecs_to_jiffies(timeout->val));
	} else {
	del_timer_sync(&rt->powerdown_timer);
	/* Turn the LED off */
	rt8515_gpio_led_off(rt);
	}

	fled->led_cdev.brightness = LED_OFF;
	/* After this the torch LED will be disabled */

	mutex_unlock(&rt->lock);

	return 0;
	}

	static int rt8515_led_flash_strobe_get(struct led_classdev_flash *fled,
	bool *state)
	{
	struct rt8515 *rt = to_rt8515(fled);

	*state = timer_pending(&rt->powerdown_timer);

	return 0;
	}

	static int rt8515_led_flash_timeout_set(struct led_classdev_flash *fled,
	u32 timeout)
	{
	/* The timeout is stored in the led-class-flash core */
	return 0;
	}

	static const struct led_flash_ops rt8515_flash_ops = {
	.strobe_set = rt8515_led_flash_strobe_set,
	.strobe_get = rt8515_led_flash_strobe_get,
	.timeout_set = rt8515_led_flash_timeout_set,
	};

	static void rt8515_powerdown_timer(struct timer_list *t)
	{
	struct rt8515 *rt = from_timer(rt, t, powerdown_timer);

	/* Turn the LED off */
	rt8515_gpio_led_off(rt);
	}

	static void rt8515_init_flash_timeout(struct rt8515 *rt)
	{
	struct led_classdev_flash *fled = &rt->fled;
	struct led_flash_setting *s;

	/* Init flash timeout setting */
	s = &fled->timeout;
	s->min = 1;
	s->max = rt->max_timeout;
	s->step = 1;
	/*
	* Set default timeout to RT8515_TIMEOUT_US except if
	* max_timeout from DT is lower.
	*/
	s->val = min(rt->max_timeout, RT8515_TIMEOUT_US);
	}

	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	/* Configure the V2L2 flash subdevice */
	static void rt8515_init_v4l2_flash_config(struct rt8515 *rt,
	struct v4l2_flash_config *v4l2_sd_cfg)
	{
	struct led_classdev *led = &rt->fled.led_cdev;
	struct led_flash_setting *s;

	strscpy(v4l2_sd_cfg->dev_name, led->dev->kobj.name,
	sizeof(v4l2_sd_cfg->dev_name));

	/*
	* Init flash intensity setting: this is a linear scale
	* capped from the device tree max intensity setting
	* 1..flash_max_intensity
	*/
	s = &v4l2_sd_cfg->intensity;
	s->min = 1;
	s->max = rt->flash_max_intensity;
	s->step = 1;
	s->val = s->max;
	}

	static void rt8515_v4l2_flash_release(struct rt8515 *rt)
	{
	v4l2_flash_release(rt->v4l2_flash);
	}

	#else
	static void rt8515_init_v4l2_flash_config(struct rt8515 *rt,
	struct v4l2_flash_config *v4l2_sd_cfg)
	{
	}

	static void rt8515_v4l2_flash_release(struct rt8515 *rt)
	{
	}
	#endif

	static void rt8515_determine_max_intensity(struct rt8515 *rt,
	struct fwnode_handle *led,
	const char *resistance,
	const char *max_ua_prop, int hw_max,
	int *max_intensity_setting)
	{
	u32 res = 0; /* Can't be 0 so 0 is undefined */
	u32 ua;
	u32 max_ma;
	int max_intensity;
	int ret;

	fwnode_property_read_u32(rt->dev->fwnode, resistance, &res);
	ret = fwnode_property_read_u32(led, max_ua_prop, &ua);

	/* Missing info in DT, OK go with hardware maxima */
	if (ret \|\| res == 0) {
	dev_err(rt->dev,
	"either %s or %s missing from DT, using HW max\n",
	resistance, max_ua_prop);
	max_ma = RT8515_MAX_IOUT_MA;
	max_intensity = hw_max;
	goto out_assign_max;
	}

	/*
	* Formula from the datasheet, this is the maximum current
	* defined by the hardware.
	*/
	max_ma = (5500 * 1000) / res;
	/*
	* Calculate max intensity (linear scaling)
	* Formula is ((ua / 1000) / max_ma) * 100, then simplified
	*/
	max_intensity = (ua / 10) / max_ma;

	dev_info(rt->dev,
	"current restricted from %u to %u mA, max intensity %d/100\n",
	max_ma, (ua / 1000), max_intensity);

	out_assign_max:
	dev_info(rt->dev, "max intensity %d/%d = %d mA\n",
	max_intensity, hw_max, max_ma);
	*max_intensity_setting = max_intensity;
	}

	static int rt8515_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct fwnode_handle *child;
	struct rt8515 *rt;
	struct led_classdev *led;
	struct led_classdev_flash *fled;
	struct led_init_data init_data = {};
	struct v4l2_flash_config v4l2_sd_cfg = {};
	int ret;

	rt = devm_kzalloc(dev, sizeof(*rt), GFP_KERNEL);
	if (!rt)
	return -ENOMEM;

	rt->dev = dev;
	fled = &rt->fled;
	led = &fled->led_cdev;

	/* ENF - Enable Flash line */
	rt->enable_flash = devm_gpiod_get(dev, "enf", GPIOD_OUT_LOW);
	if (IS_ERR(rt->enable_flash))
	return dev_err_probe(dev, PTR_ERR(rt->enable_flash),
	"cannot get ENF (enable flash) GPIO\n");

	/* ENT - Enable Torch line */
	rt->enable_torch = devm_gpiod_get(dev, "ent", GPIOD_OUT_LOW);
	if (IS_ERR(rt->enable_torch))
	return dev_err_probe(dev, PTR_ERR(rt->enable_torch),
	"cannot get ENT (enable torch) GPIO\n");

	child = fwnode_get_next_available_child_node(dev->fwnode, NULL);
	if (!child) {
	dev_err(dev,
	"No fwnode child node found for connected LED.\n");
	return -EINVAL;
	}
	init_data.fwnode = child;

	rt8515_determine_max_intensity(rt, child, "richtek,rfs-ohms",
	"flash-max-microamp",
	RT8515_FLASH_MAX,
	&rt->flash_max_intensity);
	rt8515_determine_max_intensity(rt, child, "richtek,rts-ohms",
	"led-max-microamp",
	RT8515_TORCH_MAX,
	&rt->torch_max_intensity);

	ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
	&rt->max_timeout);
	if (ret) {
	rt->max_timeout = RT8515_MAX_TIMEOUT_US;
	dev_warn(dev,
	"flash-max-timeout-us property missing\n");
	}
	timer_setup(&rt->powerdown_timer, rt8515_powerdown_timer, 0);
	rt8515_init_flash_timeout(rt);

	fled->ops = &rt8515_flash_ops;

	led->max_brightness = rt->torch_max_intensity;
	led->brightness_set_blocking = rt8515_led_brightness_set;
	led->flags \|= LED_CORE_SUSPENDRESUME \| LED_DEV_CAP_FLASH;

	mutex_init(&rt->lock);

	platform_set_drvdata(pdev, rt);

	ret = devm_led_classdev_flash_register_ext(dev, fled, &init_data);
	if (ret) {
	fwnode_handle_put(child);
	mutex_destroy(&rt->lock);
	dev_err(dev, "can't register LED %s\n", led->name);
	return ret;
	}

	rt8515_init_v4l2_flash_config(rt, &v4l2_sd_cfg);

	/* Create a V4L2 Flash device if V4L2 flash is enabled */
	rt->v4l2_flash = v4l2_flash_init(dev, child, fled, NULL, &v4l2_sd_cfg);
	if (IS_ERR(rt->v4l2_flash)) {
	ret = PTR_ERR(rt->v4l2_flash);
	dev_err(dev, "failed to register V4L2 flash device (%d)\n",
	ret);
	/*
	* Continue without the V4L2 flash
	* (we still have the classdev)
	*/
	}

	fwnode_handle_put(child);
	return 0;
	}

	static int rt8515_remove(struct platform_device *pdev)
	{
	struct rt8515 *rt = platform_get_drvdata(pdev);

	rt8515_v4l2_flash_release(rt);
	del_timer_sync(&rt->powerdown_timer);
	mutex_destroy(&rt->lock);

	return 0;
	}

	static const struct of_device_id rt8515_match[] = {
	{ .compatible = "richtek,rt8515", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, rt8515_match);

	static struct platform_driver rt8515_driver = {
	.driver = {
	.name = "rt8515",
	.of_match_table = rt8515_match,
	},
	.probe = rt8515_probe,
	.remove = rt8515_remove,
	};
	module_platform_driver(rt8515_driver);

	MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
	MODULE_DESCRIPTION("Richtek RT8515 LED driver");
	MODULE_LICENSE("GPL");