drivers/leds/leds-aw2013.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 // Driver for Awinic AW2013 3-channel LED driver

 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/regulator/consumer.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/regmap.h>

 #define AW2013_MAX_LEDS 3

 /* Reset and ID register */
 #define AW2013_RSTR 0x00
 #define AW2013_RSTR_RESET 0x55
 #define AW2013_RSTR_CHIP_ID 0x33

 /* Global control register */
 #define AW2013_GCR 0x01
 #define AW2013_GCR_ENABLE BIT(0)

 /* LED channel enable register */
 #define AW2013_LCTR 0x30
 #define AW2013_LCTR_LE(x) BIT((x))

 /* LED channel control registers */
 #define AW2013_LCFG(x) (0x31 + (x))
 #define AW2013_LCFG_IMAX_MASK (BIT(0) | BIT(1)) // Should be 0-3
 #define AW2013_LCFG_MD BIT(4)
 #define AW2013_LCFG_FI BIT(5)
 #define AW2013_LCFG_FO BIT(6)

 /* LED channel PWM registers */
 #define AW2013_REG_PWM(x) (0x34 + (x))

 /* LED channel timing registers */
 #define AW2013_LEDT0(x) (0x37 + (x) * 3)
 #define AW2013_LEDT0_T1(x) ((x) << 4) // Should be 0-7
 #define AW2013_LEDT0_T2(x) (x) // Should be 0-5

 #define AW2013_LEDT1(x) (0x38 + (x) * 3)
 #define AW2013_LEDT1_T3(x) ((x) << 4) // Should be 0-7
 #define AW2013_LEDT1_T4(x) (x) // Should be 0-7

 #define AW2013_LEDT2(x) (0x39 + (x) * 3)
 #define AW2013_LEDT2_T0(x) ((x) << 4) // Should be 0-8
 #define AW2013_LEDT2_REPEAT(x) (x) // Should be 0-15

 #define AW2013_REG_MAX 0x77

 #define AW2013_TIME_STEP 130 /* ms */

 struct aw2013;

 struct aw2013_led {
 	struct aw2013 *chip;
 	struct led_classdev cdev;
 	u32 num;
 	unsigned int imax;
 };

 struct aw2013 {
 	struct mutex mutex; /* held when writing to registers */
 	struct regulator *vcc_regulator;
 	struct i2c_client *client;
 	struct aw2013_led leds[AW2013_MAX_LEDS];
 	struct regmap *regmap;
 	int num_leds;
 	bool enabled;
 };

 static int aw2013_chip_init(struct aw2013 *chip)
 {
 	int i, ret;

 	ret = regmap_write(chip->regmap, AW2013_GCR, AW2013_GCR_ENABLE);
 	if (ret) {
 		dev_err(&chip->client->dev, "Failed to enable the chip: %d\n",
 			ret);
 		return ret;
 	}

 	for (i = 0; i < chip->num_leds; i++) {
 		ret = regmap_update_bits(chip->regmap,
 					 AW2013_LCFG(chip->leds[i].num),
 					 AW2013_LCFG_IMAX_MASK,
 					 chip->leds[i].imax);
 		if (ret) {
 			dev_err(&chip->client->dev,
 				"Failed to set maximum current for led %d: %d\n",
 				chip->leds[i].num, ret);
 			return ret;
 		}
 	}

 	return ret;
 }

 static void aw2013_chip_disable(struct aw2013 *chip)
 {
 	int ret;

 	if (!chip->enabled)
 		return;

 	regmap_write(chip->regmap, AW2013_GCR, 0);

 	ret = regulator_disable(chip->vcc_regulator);
 	if (ret) {
 		dev_err(&chip->client->dev,
 			"Failed to disable regulator: %d\n", ret);
 		return;
 	}

 	chip->enabled = false;
 }

 static int aw2013_chip_enable(struct aw2013 *chip)
 {
 	int ret;

 	if (chip->enabled)
 		return 0;

 	ret = regulator_enable(chip->vcc_regulator);
 	if (ret) {
 		dev_err(&chip->client->dev,
 			"Failed to enable regulator: %d\n", ret);
 		return ret;
 	}
 	chip->enabled = true;

 	ret = aw2013_chip_init(chip);
 	if (ret)
 		aw2013_chip_disable(chip);

 	return ret;
 }

 static bool aw2013_chip_in_use(struct aw2013 *chip)
 {
 	int i;

 	for (i = 0; i < chip->num_leds; i++)
 		if (chip->leds[i].cdev.brightness)
 			return true;

 	return false;
 }

 static int aw2013_brightness_set(struct led_classdev *cdev,
 				 enum led_brightness brightness)
 {
 	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
 	int ret, num;

 	mutex_lock(&led->chip->mutex);

 	if (aw2013_chip_in_use(led->chip)) {
 		ret = aw2013_chip_enable(led->chip);
 		if (ret)
 			goto error;
 	}

 	num = led->num;

 	ret = regmap_write(led->chip->regmap, AW2013_REG_PWM(num), brightness);
 	if (ret)
 		goto error;

 	if (brightness) {
 		ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
 					 AW2013_LCTR_LE(num), 0xFF);
 	} else {
 		ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
 					 AW2013_LCTR_LE(num), 0);
 		if (ret)
 			goto error;
 		ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
 					 AW2013_LCFG_MD, 0);
 	}
 	if (ret)
 		goto error;

 	if (!aw2013_chip_in_use(led->chip))
 		aw2013_chip_disable(led->chip);

 error:
 	mutex_unlock(&led->chip->mutex);

 	return ret;
 }

 static int aw2013_blink_set(struct led_classdev *cdev,
 			    unsigned long *delay_on, unsigned long *delay_off)
 {
 	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
 	int ret, num = led->num;
 	unsigned long off = 0, on = 0;

 	/* If no blink specified, default to 1 Hz. */
 	if (!*delay_off && !*delay_on) {
 		*delay_off = 500;
 		*delay_on = 500;
 	}

 	if (!led->cdev.brightness) {
 		led->cdev.brightness = LED_FULL;
 		ret = aw2013_brightness_set(&led->cdev, led->cdev.brightness);
 		if (ret)
 			return ret;
 	}

 	/* Never on - just set to off */
 	if (!*delay_on) {
 		led->cdev.brightness = LED_OFF;
 		return aw2013_brightness_set(&led->cdev, LED_OFF);
 	}

 	mutex_lock(&led->chip->mutex);

 	/* Never off - brightness is already set, disable blinking */
 	if (!*delay_off) {
 		ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
 					 AW2013_LCFG_MD, 0);
 		goto out;
 	}

 	/* Convert into values the HW will understand. */
 	off = min(5, ilog2((*delay_off - 1) / AW2013_TIME_STEP) + 1);
 	on = min(7, ilog2((*delay_on - 1) / AW2013_TIME_STEP) + 1);

 	*delay_off = BIT(off) * AW2013_TIME_STEP;
 	*delay_on = BIT(on) * AW2013_TIME_STEP;

 	/* Set timings */
 	ret = regmap_write(led->chip->regmap,
 			   AW2013_LEDT0(num), AW2013_LEDT0_T2(on));
 	if (ret)
 		goto out;
 	ret = regmap_write(led->chip->regmap,
 			   AW2013_LEDT1(num), AW2013_LEDT1_T4(off));
 	if (ret)
 		goto out;

 	/* Finally, enable the LED */
 	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
 				 AW2013_LCFG_MD, 0xFF);
 	if (ret)
 		goto out;

 	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
 				 AW2013_LCTR_LE(num), 0xFF);

 out:
 	mutex_unlock(&led->chip->mutex);

 	return ret;
 }

 static int aw2013_probe_dt(struct aw2013 *chip)
 {
 	struct device_node *np = dev_of_node(&chip->client->dev), *child;
 	int count, ret = 0, i = 0;
 	struct aw2013_led *led;

 	count = of_get_available_child_count(np);
 	if (!count || count > AW2013_MAX_LEDS)
 		return -EINVAL;

 	regmap_write(chip->regmap, AW2013_RSTR, AW2013_RSTR_RESET);

 	for_each_available_child_of_node(np, child) {
 		struct led_init_data init_data = {};
 		u32 source;
 		u32 imax;

 		ret = of_property_read_u32(child, "reg", &source);
 		if (ret != 0 || source >= AW2013_MAX_LEDS) {
 			dev_err(&chip->client->dev,
 				"Couldn't read LED address: %d\n", ret);
 			count--;
 			continue;
 		}

 		led = &chip->leds[i];
 		led->num = source;
 		led->chip = chip;
 		init_data.fwnode = of_fwnode_handle(child);

 		if (!of_property_read_u32(child, "led-max-microamp", &imax)) {
 			led->imax = min_t(u32, imax / 5000, 3);
 		} else {
 			led->imax = 1; // 5mA
 			dev_info(&chip->client->dev,
 				 "DT property led-max-microamp is missing\n");
 		}

 		led->cdev.brightness_set_blocking = aw2013_brightness_set;
 		led->cdev.blink_set = aw2013_blink_set;

 		ret = devm_led_classdev_register_ext(&chip->client->dev,
 						     &led->cdev, &init_data);
 		if (ret < 0) {
 			of_node_put(child);
 			return ret;
 		}

 		i++;
 	}

 	if (!count)
 		return -EINVAL;

 	chip->num_leds = i;

 	return 0;
 }

 static const struct regmap_config aw2013_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = AW2013_REG_MAX,
 };

 static int aw2013_probe(struct i2c_client *client)
 {
 	struct aw2013 *chip;
 	int ret;
 	unsigned int chipid;

 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	mutex_init(&chip->mutex);
 	mutex_lock(&chip->mutex);

 	chip->client = client;
 	i2c_set_clientdata(client, chip);

 	chip->regmap = devm_regmap_init_i2c(client, &aw2013_regmap_config);
 	if (IS_ERR(chip->regmap)) {
 		ret = PTR_ERR(chip->regmap);
 		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 			ret);
 		goto error;
 	}

 	chip->vcc_regulator = devm_regulator_get(&client->dev, "vcc");
 	ret = PTR_ERR_OR_ZERO(chip->vcc_regulator);
 	if (ret) {
 		if (ret != -EPROBE_DEFER)
 			dev_err(&client->dev,
 				"Failed to request regulator: %d\n", ret);
 		goto error;
 	}

 	ret = regulator_enable(chip->vcc_regulator);
 	if (ret) {
 		dev_err(&client->dev,
 			"Failed to enable regulator: %d\n", ret);
 		goto error;
 	}

 	ret = regmap_read(chip->regmap, AW2013_RSTR, &chipid);
 	if (ret) {
 		dev_err(&client->dev, "Failed to read chip ID: %d\n",
 			ret);
 		goto error_reg;
 	}

 	if (chipid != AW2013_RSTR_CHIP_ID) {
 		dev_err(&client->dev, "Chip reported wrong ID: %x\n",
 			chipid);
 		ret = -ENODEV;
 		goto error_reg;
 	}

 	ret = aw2013_probe_dt(chip);
 	if (ret < 0)
 		goto error_reg;

 	ret = regulator_disable(chip->vcc_regulator);
 	if (ret) {
 		dev_err(&client->dev,
 			"Failed to disable regulator: %d\n", ret);
 		goto error;
 	}

 	mutex_unlock(&chip->mutex);

 	return 0;

 error_reg:
 	regulator_disable(chip->vcc_regulator);

 error:
 	mutex_destroy(&chip->mutex);
 	return ret;
 }

 static int aw2013_remove(struct i2c_client *client)
 {
 	struct aw2013 *chip = i2c_get_clientdata(client);

 	aw2013_chip_disable(chip);

 	mutex_destroy(&chip->mutex);

 	return 0;
 }

 static const struct of_device_id aw2013_match_table[] = {
 	{ .compatible = "awinic,aw2013", },
 	{ /* sentinel */ },
 };

 MODULE_DEVICE_TABLE(of, aw2013_match_table);

 static struct i2c_driver aw2013_driver = {
 	.driver = {
 		.name = "leds-aw2013",
 		.of_match_table = of_match_ptr(aw2013_match_table),
 	},
 	.probe_new = aw2013_probe,
 	.remove = aw2013_remove,
 };

 module_i2c_driver(aw2013_driver);

 MODULE_AUTHOR("Nikita Travkin <nikitos.tr@gmail.com>");
 MODULE_DESCRIPTION("AW2013 LED driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+
	// Driver for Awinic AW2013 3-channel LED driver

	#include <linux/i2c.h>
	#include <linux/leds.h>
	#include <linux/module.h>
	#include <linux/regulator/consumer.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/regmap.h>

	#define AW2013_MAX_LEDS 3

	/* Reset and ID register */
	#define AW2013_RSTR 0x00
	#define AW2013_RSTR_RESET 0x55
	#define AW2013_RSTR_CHIP_ID 0x33

	/* Global control register */
	#define AW2013_GCR 0x01
	#define AW2013_GCR_ENABLE BIT(0)

	/* LED channel enable register */
	#define AW2013_LCTR 0x30
	#define AW2013_LCTR_LE(x) BIT((x))

	/* LED channel control registers */
	#define AW2013_LCFG(x) (0x31 + (x))
	#define AW2013_LCFG_IMAX_MASK (BIT(0) \| BIT(1)) // Should be 0-3
	#define AW2013_LCFG_MD BIT(4)
	#define AW2013_LCFG_FI BIT(5)
	#define AW2013_LCFG_FO BIT(6)

	/* LED channel PWM registers */
	#define AW2013_REG_PWM(x) (0x34 + (x))

	/* LED channel timing registers */
	#define AW2013_LEDT0(x) (0x37 + (x) * 3)
	#define AW2013_LEDT0_T1(x) ((x) << 4) // Should be 0-7
	#define AW2013_LEDT0_T2(x) (x) // Should be 0-5

	#define AW2013_LEDT1(x) (0x38 + (x) * 3)
	#define AW2013_LEDT1_T3(x) ((x) << 4) // Should be 0-7
	#define AW2013_LEDT1_T4(x) (x) // Should be 0-7

	#define AW2013_LEDT2(x) (0x39 + (x) * 3)
	#define AW2013_LEDT2_T0(x) ((x) << 4) // Should be 0-8
	#define AW2013_LEDT2_REPEAT(x) (x) // Should be 0-15

	#define AW2013_REG_MAX 0x77

	#define AW2013_TIME_STEP 130 /* ms */

	struct aw2013;

	struct aw2013_led {
	struct aw2013 *chip;
	struct led_classdev cdev;
	u32 num;
	unsigned int imax;
	};

	struct aw2013 {
	struct mutex mutex; /* held when writing to registers */
	struct regulator *vcc_regulator;
	struct i2c_client *client;
	struct aw2013_led leds[AW2013_MAX_LEDS];
	struct regmap *regmap;
	int num_leds;
	bool enabled;
	};

	static int aw2013_chip_init(struct aw2013 *chip)
	{
	int i, ret;

	ret = regmap_write(chip->regmap, AW2013_GCR, AW2013_GCR_ENABLE);
	if (ret) {
	dev_err(&chip->client->dev, "Failed to enable the chip: %d\n",
	ret);
	return ret;
	}

	for (i = 0; i < chip->num_leds; i++) {
	ret = regmap_update_bits(chip->regmap,
	AW2013_LCFG(chip->leds[i].num),
	AW2013_LCFG_IMAX_MASK,
	chip->leds[i].imax);
	if (ret) {
	dev_err(&chip->client->dev,
	"Failed to set maximum current for led %d: %d\n",
	chip->leds[i].num, ret);
	return ret;
	}
	}

	return ret;
	}

	static void aw2013_chip_disable(struct aw2013 *chip)
	{
	int ret;

	if (!chip->enabled)
	return;

	regmap_write(chip->regmap, AW2013_GCR, 0);

	ret = regulator_disable(chip->vcc_regulator);
	if (ret) {
	dev_err(&chip->client->dev,
	"Failed to disable regulator: %d\n", ret);
	return;
	}

	chip->enabled = false;
	}

	static int aw2013_chip_enable(struct aw2013 *chip)
	{
	int ret;

	if (chip->enabled)
	return 0;

	ret = regulator_enable(chip->vcc_regulator);
	if (ret) {
	dev_err(&chip->client->dev,
	"Failed to enable regulator: %d\n", ret);
	return ret;
	}
	chip->enabled = true;

	ret = aw2013_chip_init(chip);
	if (ret)
	aw2013_chip_disable(chip);

	return ret;
	}

	static bool aw2013_chip_in_use(struct aw2013 *chip)
	{
	int i;

	for (i = 0; i < chip->num_leds; i++)
	if (chip->leds[i].cdev.brightness)
	return true;

	return false;
	}

	static int aw2013_brightness_set(struct led_classdev *cdev,
	enum led_brightness brightness)
	{
	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
	int ret, num;

	mutex_lock(&led->chip->mutex);

	if (aw2013_chip_in_use(led->chip)) {
	ret = aw2013_chip_enable(led->chip);
	if (ret)
	goto error;
	}

	num = led->num;

	ret = regmap_write(led->chip->regmap, AW2013_REG_PWM(num), brightness);
	if (ret)
	goto error;

	if (brightness) {
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
	AW2013_LCTR_LE(num), 0xFF);
	} else {
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
	AW2013_LCTR_LE(num), 0);
	if (ret)
	goto error;
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
	AW2013_LCFG_MD, 0);
	}
	if (ret)
	goto error;

	if (!aw2013_chip_in_use(led->chip))
	aw2013_chip_disable(led->chip);

	error:
	mutex_unlock(&led->chip->mutex);

	return ret;
	}

	static int aw2013_blink_set(struct led_classdev *cdev,
	unsigned long delay_on, unsigned long delay_off)
	{
	struct aw2013_led *led = container_of(cdev, struct aw2013_led, cdev);
	int ret, num = led->num;
	unsigned long off = 0, on = 0;

	/* If no blink specified, default to 1 Hz. */
	if (!delay_off && !delay_on) {
	*delay_off = 500;
	*delay_on = 500;
	}

	if (!led->cdev.brightness) {
	led->cdev.brightness = LED_FULL;
	ret = aw2013_brightness_set(&led->cdev, led->cdev.brightness);
	if (ret)
	return ret;
	}

	/* Never on - just set to off */
	if (!*delay_on) {
	led->cdev.brightness = LED_OFF;
	return aw2013_brightness_set(&led->cdev, LED_OFF);
	}

	mutex_lock(&led->chip->mutex);

	/* Never off - brightness is already set, disable blinking */
	if (!*delay_off) {
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
	AW2013_LCFG_MD, 0);
	goto out;
	}

	/* Convert into values the HW will understand. */
	off = min(5, ilog2((*delay_off - 1) / AW2013_TIME_STEP) + 1);
	on = min(7, ilog2((*delay_on - 1) / AW2013_TIME_STEP) + 1);

	delay_off = BIT(off) AW2013_TIME_STEP;
	delay_on = BIT(on) AW2013_TIME_STEP;

	/* Set timings */
	ret = regmap_write(led->chip->regmap,
	AW2013_LEDT0(num), AW2013_LEDT0_T2(on));
	if (ret)
	goto out;
	ret = regmap_write(led->chip->regmap,
	AW2013_LEDT1(num), AW2013_LEDT1_T4(off));
	if (ret)
	goto out;

	/* Finally, enable the LED */
	ret = regmap_update_bits(led->chip->regmap, AW2013_LCFG(num),
	AW2013_LCFG_MD, 0xFF);
	if (ret)
	goto out;

	ret = regmap_update_bits(led->chip->regmap, AW2013_LCTR,
	AW2013_LCTR_LE(num), 0xFF);

	out:
	mutex_unlock(&led->chip->mutex);

	return ret;
	}

	static int aw2013_probe_dt(struct aw2013 *chip)
	{
	struct device_node np = dev_of_node(&chip->client->dev), child;
	int count, ret = 0, i = 0;
	struct aw2013_led *led;

	count = of_get_available_child_count(np);
	if (!count \|\| count > AW2013_MAX_LEDS)
	return -EINVAL;

	regmap_write(chip->regmap, AW2013_RSTR, AW2013_RSTR_RESET);

	for_each_available_child_of_node(np, child) {
	struct led_init_data init_data = {};
	u32 source;
	u32 imax;

	ret = of_property_read_u32(child, "reg", &source);
	if (ret != 0 \|\| source >= AW2013_MAX_LEDS) {
	dev_err(&chip->client->dev,
	"Couldn't read LED address: %d\n", ret);
	count--;
	continue;
	}

	led = &chip->leds[i];
	led->num = source;
	led->chip = chip;
	init_data.fwnode = of_fwnode_handle(child);

	if (!of_property_read_u32(child, "led-max-microamp", &imax)) {
	led->imax = min_t(u32, imax / 5000, 3);
	} else {
	led->imax = 1; // 5mA
	dev_info(&chip->client->dev,
	"DT property led-max-microamp is missing\n");
	}

	led->cdev.brightness_set_blocking = aw2013_brightness_set;
	led->cdev.blink_set = aw2013_blink_set;

	ret = devm_led_classdev_register_ext(&chip->client->dev,
	&led->cdev, &init_data);
	if (ret < 0) {
	of_node_put(child);
	return ret;
	}

	i++;
	}

	if (!count)
	return -EINVAL;

	chip->num_leds = i;

	return 0;
	}

	static const struct regmap_config aw2013_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = AW2013_REG_MAX,
	};

	static int aw2013_probe(struct i2c_client *client)
	{
	struct aw2013 *chip;
	int ret;
	unsigned int chipid;

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	mutex_init(&chip->mutex);
	mutex_lock(&chip->mutex);

	chip->client = client;
	i2c_set_clientdata(client, chip);

	chip->regmap = devm_regmap_init_i2c(client, &aw2013_regmap_config);
	if (IS_ERR(chip->regmap)) {
	ret = PTR_ERR(chip->regmap);
	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	ret);
	goto error;
	}

	chip->vcc_regulator = devm_regulator_get(&client->dev, "vcc");
	ret = PTR_ERR_OR_ZERO(chip->vcc_regulator);
	if (ret) {
	if (ret != -EPROBE_DEFER)
	dev_err(&client->dev,
	"Failed to request regulator: %d\n", ret);
	goto error;
	}

	ret = regulator_enable(chip->vcc_regulator);
	if (ret) {
	dev_err(&client->dev,
	"Failed to enable regulator: %d\n", ret);
	goto error;
	}

	ret = regmap_read(chip->regmap, AW2013_RSTR, &chipid);
	if (ret) {
	dev_err(&client->dev, "Failed to read chip ID: %d\n",
	ret);
	goto error_reg;
	}

	if (chipid != AW2013_RSTR_CHIP_ID) {
	dev_err(&client->dev, "Chip reported wrong ID: %x\n",
	chipid);
	ret = -ENODEV;
	goto error_reg;
	}

	ret = aw2013_probe_dt(chip);
	if (ret < 0)
	goto error_reg;

	ret = regulator_disable(chip->vcc_regulator);
	if (ret) {
	dev_err(&client->dev,
	"Failed to disable regulator: %d\n", ret);
	goto error;
	}

	mutex_unlock(&chip->mutex);

	return 0;

	error_reg:
	regulator_disable(chip->vcc_regulator);

	error:
	mutex_destroy(&chip->mutex);
	return ret;
	}

	static int aw2013_remove(struct i2c_client *client)
	{
	struct aw2013 *chip = i2c_get_clientdata(client);

	aw2013_chip_disable(chip);

	mutex_destroy(&chip->mutex);

	return 0;
	}

	static const struct of_device_id aw2013_match_table[] = {
	{ .compatible = "awinic,aw2013", },
	{ /* sentinel */ },
	};

	MODULE_DEVICE_TABLE(of, aw2013_match_table);

	static struct i2c_driver aw2013_driver = {
	.driver = {
	.name = "leds-aw2013",
	.of_match_table = of_match_ptr(aw2013_match_table),
	},
	.probe_new = aw2013_probe,
	.remove = aw2013_remove,
	};

	module_i2c_driver(aw2013_driver);

	MODULE_AUTHOR("Nikita Travkin <nikitos.tr@gmail.com>");
	MODULE_DESCRIPTION("AW2013 LED driver");
	MODULE_LICENSE("GPL v2");