drivers/leds/leds-lm3697.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 // TI LM3697 LED chip family driver
 // Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/

 #include <linux/bits.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/types.h>

 #include <linux/leds-ti-lmu-common.h>

 #define LM3697_REV			0x0
 #define LM3697_RESET			0x1
 #define LM3697_OUTPUT_CONFIG		0x10
 #define LM3697_CTRL_A_RAMP		0x11
 #define LM3697_CTRL_B_RAMP		0x12
 #define LM3697_CTRL_A_B_RT_RAMP		0x13
 #define LM3697_CTRL_A_B_RAMP_CFG	0x14
 #define LM3697_CTRL_A_B_BRT_CFG		0x16
 #define LM3697_CTRL_A_FS_CURR_CFG	0x17
 #define LM3697_CTRL_B_FS_CURR_CFG	0x18
 #define LM3697_PWM_CFG			0x1c
 #define LM3697_CTRL_A_BRT_LSB		0x20
 #define LM3697_CTRL_A_BRT_MSB		0x21
 #define LM3697_CTRL_B_BRT_LSB		0x22
 #define LM3697_CTRL_B_BRT_MSB		0x23
 #define LM3697_CTRL_ENABLE		0x24

 #define LM3697_SW_RESET		BIT(0)

 #define LM3697_CTRL_A_EN	BIT(0)
 #define LM3697_CTRL_B_EN	BIT(1)
 #define LM3697_CTRL_A_B_EN	(LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)

 #define LM3697_MAX_LED_STRINGS	3

 #define LM3697_CONTROL_A	0
 #define LM3697_CONTROL_B	1
 #define LM3697_MAX_CONTROL_BANKS 2

 /**
  * struct lm3697_led -
  * @hvled_strings: Array of LED strings associated with a control bank
  * @label: LED label
  * @led_dev: LED class device
  * @priv: Pointer to the device struct
  * @lmu_data: Register and setting values for common code
  * @control_bank: Control bank the LED is associated to. 0 is control bank A
  *		   1 is control bank B
  * @enabled: LED brightness level (or LED_OFF)
  * @num_leds: Number of LEDs available
  */
 struct lm3697_led {
 	u32 hvled_strings[LM3697_MAX_LED_STRINGS];
 	char label[LED_MAX_NAME_SIZE];
 	struct led_classdev led_dev;
 	struct lm3697 *priv;
 	struct ti_lmu_bank lmu_data;
 	int control_bank;
 	int enabled;
 	int num_leds;
 };

 /**
  * struct lm3697 -
  * @enable_gpio: Hardware enable gpio
  * @regulator: LED supply regulator pointer
  * @client: Pointer to the I2C client
  * @regmap: Devices register map
  * @dev: Pointer to the devices device struct
  * @lock: Lock for reading/writing the device
  * @leds: Array of LED strings
  * @bank_cfg: OUTPUT_CONFIG register values
  * @num_banks: Number of control banks
  */
 struct lm3697 {
 	struct gpio_desc *enable_gpio;
 	struct regulator *regulator;
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct device *dev;
 	struct mutex lock;

 	int bank_cfg;
 	int num_banks;

 	struct lm3697_led leds[] __counted_by(num_banks);
 };

 static const struct reg_default lm3697_reg_defs[] = {
 	{LM3697_OUTPUT_CONFIG, 0x6},
 	{LM3697_CTRL_A_RAMP, 0x0},
 	{LM3697_CTRL_B_RAMP, 0x0},
 	{LM3697_CTRL_A_B_RT_RAMP, 0x0},
 	{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
 	{LM3697_CTRL_A_B_BRT_CFG, 0x0},
 	{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
 	{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
 	{LM3697_PWM_CFG, 0xc},
 	{LM3697_CTRL_A_BRT_LSB, 0x0},
 	{LM3697_CTRL_A_BRT_MSB, 0x0},
 	{LM3697_CTRL_B_BRT_LSB, 0x0},
 	{LM3697_CTRL_B_BRT_MSB, 0x0},
 	{LM3697_CTRL_ENABLE, 0x0},
 };

 static const struct regmap_config lm3697_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = LM3697_CTRL_ENABLE,
 	.reg_defaults = lm3697_reg_defs,
 	.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
 	.cache_type = REGCACHE_FLAT,
 };

 static int lm3697_brightness_set(struct led_classdev *led_cdev,
 				enum led_brightness brt_val)
 {
 	struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
 					      led_dev);
 	int ctrl_en_val = (1 << led->control_bank);
 	struct device *dev = led->priv->dev;
 	int ret;

 	mutex_lock(&led->priv->lock);

 	if (brt_val == LED_OFF) {
 		ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
 					 ctrl_en_val, ~ctrl_en_val);
 		if (ret) {
 			dev_err(dev, "Cannot write ctrl register\n");
 			goto brightness_out;
 		}

 		led->enabled = LED_OFF;
 	} else {
 		ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
 		if (ret) {
 			dev_err(dev, "Cannot write brightness\n");
 			goto brightness_out;
 		}

 		if (!led->enabled) {
 			ret = regmap_update_bits(led->priv->regmap,
 						 LM3697_CTRL_ENABLE,
 						 ctrl_en_val, ctrl_en_val);
 			if (ret) {
 				dev_err(dev, "Cannot enable the device\n");
 				goto brightness_out;
 			}

 			led->enabled = brt_val;
 		}
 	}

 brightness_out:
 	mutex_unlock(&led->priv->lock);
 	return ret;
 }

 static int lm3697_init(struct lm3697 *priv)
 {
 	struct device *dev = priv->dev;
 	struct lm3697_led *led;
 	int i, ret;

 	if (priv->enable_gpio) {
 		gpiod_direction_output(priv->enable_gpio, 1);
 	} else {
 		ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
 		if (ret) {
 			dev_err(dev, "Cannot reset the device\n");
 			goto out;
 		}
 	}

 	ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
 	if (ret) {
 		dev_err(dev, "Cannot write ctrl enable\n");
 		goto out;
 	}

 	ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
 	if (ret)
 		dev_err(dev, "Cannot write OUTPUT config\n");

 	for (i = 0; i < priv->num_banks; i++) {
 		led = &priv->leds[i];
 		ret = ti_lmu_common_set_ramp(&led->lmu_data);
 		if (ret)
 			dev_err(dev, "Setting the ramp rate failed\n");
 	}
 out:
 	return ret;
 }

 static int lm3697_probe_dt(struct lm3697 *priv)
 {
 	struct fwnode_handle *child = NULL;
 	struct device *dev = priv->dev;
 	struct lm3697_led *led;
 	int ret = -EINVAL;
 	int control_bank;
 	size_t i = 0;
 	int j;

 	priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 						    GPIOD_OUT_LOW);
 	if (IS_ERR(priv->enable_gpio))
 		return dev_err_probe(dev, PTR_ERR(priv->enable_gpio),
 					  "Failed to get enable GPIO\n");

 	priv->regulator = devm_regulator_get(dev, "vled");
 	if (IS_ERR(priv->regulator))
 		priv->regulator = NULL;

 	device_for_each_child_node(dev, child) {
 		struct led_init_data init_data = {};

 		ret = fwnode_property_read_u32(child, "reg", &control_bank);
 		if (ret) {
 			dev_err(dev, "reg property missing\n");
 			goto child_out;
 		}

 		if (control_bank > LM3697_CONTROL_B) {
 			dev_err(dev, "reg property is invalid\n");
 			ret = -EINVAL;
 			goto child_out;
 		}

 		led = &priv->leds[i];

 		ret = ti_lmu_common_get_brt_res(dev, child, &led->lmu_data);
 		if (ret)
 			dev_warn(dev,
 				 "brightness resolution property missing\n");

 		led->control_bank = control_bank;
 		led->lmu_data.regmap = priv->regmap;
 		led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
 						 control_bank;
 		led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
 						   led->control_bank * 2;
 		led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
 						   led->control_bank * 2;

 		led->num_leds = fwnode_property_count_u32(child, "led-sources");
 		if (led->num_leds > LM3697_MAX_LED_STRINGS) {
 			dev_err(dev, "Too many LED strings defined\n");
 			continue;
 		}

 		ret = fwnode_property_read_u32_array(child, "led-sources",
 						    led->hvled_strings,
 						    led->num_leds);
 		if (ret) {
 			dev_err(dev, "led-sources property missing\n");
 			goto child_out;
 		}

 		for (j = 0; j < led->num_leds; j++)
 			priv->bank_cfg |=
 				(led->control_bank << led->hvled_strings[j]);

 		ret = ti_lmu_common_get_ramp_params(dev, child, &led->lmu_data);
 		if (ret)
 			dev_warn(dev, "runtime-ramp properties missing\n");

 		init_data.fwnode = child;
 		init_data.devicename = priv->client->name;
 		/* for backwards compatibility if `label` is not present */
 		init_data.default_label = ":";

 		led->priv = priv;
 		led->led_dev.max_brightness = led->lmu_data.max_brightness;
 		led->led_dev.brightness_set_blocking = lm3697_brightness_set;

 		ret = devm_led_classdev_register_ext(dev, &led->led_dev,
 						     &init_data);
 		if (ret) {
 			dev_err(dev, "led register err: %d\n", ret);
 			goto child_out;
 		}

 		i++;
 	}

 	return ret;

 child_out:
 	fwnode_handle_put(child);
 	return ret;
 }

 static int lm3697_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct lm3697 *led;
 	int count;
 	int ret;

 	count = device_get_child_node_count(dev);
 	if (!count || count > LM3697_MAX_CONTROL_BANKS) {
 		dev_err(dev, "Strange device tree!");
 		return -ENODEV;
 	}

 	led = devm_kzalloc(dev, struct_size(led, leds, count), GFP_KERNEL);
 	if (!led)
 		return -ENOMEM;

 	mutex_init(&led->lock);
 	i2c_set_clientdata(client, led);

 	led->client = client;
 	led->dev = dev;
 	led->num_banks = count;
 	led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
 	if (IS_ERR(led->regmap)) {
 		ret = PTR_ERR(led->regmap);
 		dev_err(dev, "Failed to allocate register map: %d\n", ret);
 		return ret;
 	}

 	ret = lm3697_probe_dt(led);
 	if (ret)
 		return ret;

 	return lm3697_init(led);
 }

 static void lm3697_remove(struct i2c_client *client)
 {
 	struct lm3697 *led = i2c_get_clientdata(client);
 	struct device *dev = &led->client->dev;
 	int ret;

 	ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
 				 LM3697_CTRL_A_B_EN, 0);
 	if (ret)
 		dev_err(dev, "Failed to disable the device\n");

 	if (led->enable_gpio)
 		gpiod_direction_output(led->enable_gpio, 0);

 	if (led->regulator) {
 		ret = regulator_disable(led->regulator);
 		if (ret)
 			dev_err(dev, "Failed to disable regulator\n");
 	}

 	mutex_destroy(&led->lock);
 }

 static const struct i2c_device_id lm3697_id[] = {
 	{ "lm3697", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, lm3697_id);

 static const struct of_device_id of_lm3697_leds_match[] = {
 	{ .compatible = "ti,lm3697", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);

 static struct i2c_driver lm3697_driver = {
 	.driver = {
 		.name	= "lm3697",
 		.of_match_table = of_lm3697_leds_match,
 	},
 	.probe		= lm3697_probe,
 	.remove		= lm3697_remove,
 	.id_table	= lm3697_id,
 };
 module_i2c_driver(lm3697_driver);

 MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	// TI LM3697 LED chip family driver
	// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/

	#include <linux/bits.h>
	#include <linux/gpio/consumer.h>
	#include <linux/i2c.h>
	#include <linux/mod_devicetable.h>
	#include <linux/module.h>
	#include <linux/property.h>
	#include <linux/regmap.h>
	#include <linux/regulator/consumer.h>
	#include <linux/types.h>

	#include <linux/leds-ti-lmu-common.h>

	#define LM3697_REV 0x0
	#define LM3697_RESET 0x1
	#define LM3697_OUTPUT_CONFIG 0x10
	#define LM3697_CTRL_A_RAMP 0x11
	#define LM3697_CTRL_B_RAMP 0x12
	#define LM3697_CTRL_A_B_RT_RAMP 0x13
	#define LM3697_CTRL_A_B_RAMP_CFG 0x14
	#define LM3697_CTRL_A_B_BRT_CFG 0x16
	#define LM3697_CTRL_A_FS_CURR_CFG 0x17
	#define LM3697_CTRL_B_FS_CURR_CFG 0x18
	#define LM3697_PWM_CFG 0x1c
	#define LM3697_CTRL_A_BRT_LSB 0x20
	#define LM3697_CTRL_A_BRT_MSB 0x21
	#define LM3697_CTRL_B_BRT_LSB 0x22
	#define LM3697_CTRL_B_BRT_MSB 0x23
	#define LM3697_CTRL_ENABLE 0x24

	#define LM3697_SW_RESET BIT(0)

	#define LM3697_CTRL_A_EN BIT(0)
	#define LM3697_CTRL_B_EN BIT(1)
	#define LM3697_CTRL_A_B_EN (LM3697_CTRL_A_EN \| LM3697_CTRL_B_EN)

	#define LM3697_MAX_LED_STRINGS 3

	#define LM3697_CONTROL_A 0
	#define LM3697_CONTROL_B 1
	#define LM3697_MAX_CONTROL_BANKS 2

	/**
	* struct lm3697_led -
	* @hvled_strings: Array of LED strings associated with a control bank
	* @label: LED label
	* @led_dev: LED class device
	* @priv: Pointer to the device struct
	* @lmu_data: Register and setting values for common code
	* @control_bank: Control bank the LED is associated to. 0 is control bank A
	* 1 is control bank B
	* @enabled: LED brightness level (or LED_OFF)
	* @num_leds: Number of LEDs available
	*/
	struct lm3697_led {
	u32 hvled_strings[LM3697_MAX_LED_STRINGS];
	char label[LED_MAX_NAME_SIZE];
	struct led_classdev led_dev;
	struct lm3697 *priv;
	struct ti_lmu_bank lmu_data;
	int control_bank;
	int enabled;
	int num_leds;
	};

	/**
	* struct lm3697 -
	* @enable_gpio: Hardware enable gpio
	* @regulator: LED supply regulator pointer
	* @client: Pointer to the I2C client
	* @regmap: Devices register map
	* @dev: Pointer to the devices device struct
	* @lock: Lock for reading/writing the device
	* @leds: Array of LED strings
	* @bank_cfg: OUTPUT_CONFIG register values
	* @num_banks: Number of control banks
	*/
	struct lm3697 {
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	struct i2c_client *client;
	struct regmap *regmap;
	struct device *dev;
	struct mutex lock;

	int bank_cfg;
	int num_banks;

	struct lm3697_led leds[] __counted_by(num_banks);
	};

	static const struct reg_default lm3697_reg_defs[] = {
	{LM3697_OUTPUT_CONFIG, 0x6},
	{LM3697_CTRL_A_RAMP, 0x0},
	{LM3697_CTRL_B_RAMP, 0x0},
	{LM3697_CTRL_A_B_RT_RAMP, 0x0},
	{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
	{LM3697_CTRL_A_B_BRT_CFG, 0x0},
	{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
	{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
	{LM3697_PWM_CFG, 0xc},
	{LM3697_CTRL_A_BRT_LSB, 0x0},
	{LM3697_CTRL_A_BRT_MSB, 0x0},
	{LM3697_CTRL_B_BRT_LSB, 0x0},
	{LM3697_CTRL_B_BRT_MSB, 0x0},
	{LM3697_CTRL_ENABLE, 0x0},
	};

	static const struct regmap_config lm3697_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LM3697_CTRL_ENABLE,
	.reg_defaults = lm3697_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
	.cache_type = REGCACHE_FLAT,
	};

	static int lm3697_brightness_set(struct led_classdev *led_cdev,
	enum led_brightness brt_val)
	{
	struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
	led_dev);
	int ctrl_en_val = (1 << led->control_bank);
	struct device *dev = led->priv->dev;
	int ret;

	mutex_lock(&led->priv->lock);

	if (brt_val == LED_OFF) {
	ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
	ctrl_en_val, ~ctrl_en_val);
	if (ret) {
	dev_err(dev, "Cannot write ctrl register\n");
	goto brightness_out;
	}

	led->enabled = LED_OFF;
	} else {
	ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
	if (ret) {
	dev_err(dev, "Cannot write brightness\n");
	goto brightness_out;
	}

	if (!led->enabled) {
	ret = regmap_update_bits(led->priv->regmap,
	LM3697_CTRL_ENABLE,
	ctrl_en_val, ctrl_en_val);
	if (ret) {
	dev_err(dev, "Cannot enable the device\n");
	goto brightness_out;
	}

	led->enabled = brt_val;
	}
	}

	brightness_out:
	mutex_unlock(&led->priv->lock);
	return ret;
	}

	static int lm3697_init(struct lm3697 *priv)
	{
	struct device *dev = priv->dev;
	struct lm3697_led *led;
	int i, ret;

	if (priv->enable_gpio) {
	gpiod_direction_output(priv->enable_gpio, 1);
	} else {
	ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
	if (ret) {
	dev_err(dev, "Cannot reset the device\n");
	goto out;
	}
	}

	ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
	if (ret) {
	dev_err(dev, "Cannot write ctrl enable\n");
	goto out;
	}

	ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
	if (ret)
	dev_err(dev, "Cannot write OUTPUT config\n");

	for (i = 0; i < priv->num_banks; i++) {
	led = &priv->leds[i];
	ret = ti_lmu_common_set_ramp(&led->lmu_data);
	if (ret)
	dev_err(dev, "Setting the ramp rate failed\n");
	}
	out:
	return ret;
	}

	static int lm3697_probe_dt(struct lm3697 *priv)
	{
	struct fwnode_handle *child = NULL;
	struct device *dev = priv->dev;
	struct lm3697_led *led;
	int ret = -EINVAL;
	int control_bank;
	size_t i = 0;
	int j;

	priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
	GPIOD_OUT_LOW);
	if (IS_ERR(priv->enable_gpio))
	return dev_err_probe(dev, PTR_ERR(priv->enable_gpio),
	"Failed to get enable GPIO\n");

	priv->regulator = devm_regulator_get(dev, "vled");
	if (IS_ERR(priv->regulator))
	priv->regulator = NULL;

	device_for_each_child_node(dev, child) {
	struct led_init_data init_data = {};

	ret = fwnode_property_read_u32(child, "reg", &control_bank);
	if (ret) {
	dev_err(dev, "reg property missing\n");
	goto child_out;
	}

	if (control_bank > LM3697_CONTROL_B) {
	dev_err(dev, "reg property is invalid\n");
	ret = -EINVAL;
	goto child_out;
	}

	led = &priv->leds[i];

	ret = ti_lmu_common_get_brt_res(dev, child, &led->lmu_data);
	if (ret)
	dev_warn(dev,
	"brightness resolution property missing\n");

	led->control_bank = control_bank;
	led->lmu_data.regmap = priv->regmap;
	led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
	control_bank;
	led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
	led->control_bank * 2;
	led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
	led->control_bank * 2;

	led->num_leds = fwnode_property_count_u32(child, "led-sources");
	if (led->num_leds > LM3697_MAX_LED_STRINGS) {
	dev_err(dev, "Too many LED strings defined\n");
	continue;
	}

	ret = fwnode_property_read_u32_array(child, "led-sources",
	led->hvled_strings,
	led->num_leds);
	if (ret) {
	dev_err(dev, "led-sources property missing\n");
	goto child_out;
	}

	for (j = 0; j < led->num_leds; j++)
	priv->bank_cfg \|=
	(led->control_bank << led->hvled_strings[j]);

	ret = ti_lmu_common_get_ramp_params(dev, child, &led->lmu_data);
	if (ret)
	dev_warn(dev, "runtime-ramp properties missing\n");

	init_data.fwnode = child;
	init_data.devicename = priv->client->name;
	/* for backwards compatibility if `label` is not present */
	init_data.default_label = ":";

	led->priv = priv;
	led->led_dev.max_brightness = led->lmu_data.max_brightness;
	led->led_dev.brightness_set_blocking = lm3697_brightness_set;

	ret = devm_led_classdev_register_ext(dev, &led->led_dev,
	&init_data);
	if (ret) {
	dev_err(dev, "led register err: %d\n", ret);
	goto child_out;
	}

	i++;
	}

	return ret;

	child_out:
	fwnode_handle_put(child);
	return ret;
	}

	static int lm3697_probe(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct lm3697 *led;
	int count;
	int ret;

	count = device_get_child_node_count(dev);
	if (!count \|\| count > LM3697_MAX_CONTROL_BANKS) {
	dev_err(dev, "Strange device tree!");
	return -ENODEV;
	}

	led = devm_kzalloc(dev, struct_size(led, leds, count), GFP_KERNEL);
	if (!led)
	return -ENOMEM;

	mutex_init(&led->lock);
	i2c_set_clientdata(client, led);

	led->client = client;
	led->dev = dev;
	led->num_banks = count;
	led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
	if (IS_ERR(led->regmap)) {
	ret = PTR_ERR(led->regmap);
	dev_err(dev, "Failed to allocate register map: %d\n", ret);
	return ret;
	}

	ret = lm3697_probe_dt(led);
	if (ret)
	return ret;

	return lm3697_init(led);
	}

	static void lm3697_remove(struct i2c_client *client)
	{
	struct lm3697 *led = i2c_get_clientdata(client);
	struct device *dev = &led->client->dev;
	int ret;

	ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
	LM3697_CTRL_A_B_EN, 0);
	if (ret)
	dev_err(dev, "Failed to disable the device\n");

	if (led->enable_gpio)
	gpiod_direction_output(led->enable_gpio, 0);

	if (led->regulator) {
	ret = regulator_disable(led->regulator);
	if (ret)
	dev_err(dev, "Failed to disable regulator\n");
	}

	mutex_destroy(&led->lock);
	}

	static const struct i2c_device_id lm3697_id[] = {
	{ "lm3697", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, lm3697_id);

	static const struct of_device_id of_lm3697_leds_match[] = {
	{ .compatible = "ti,lm3697", },
	{},
	};
	MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);

	static struct i2c_driver lm3697_driver = {
	.driver = {
	.name = "lm3697",
	.of_match_table = of_lm3697_leds_match,
	},
	.probe = lm3697_probe,
	.remove = lm3697_remove,
	.id_table = lm3697_id,
	};
	module_i2c_driver(lm3697_driver);

	MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
	MODULE_LICENSE("GPL v2");