[mirror_ubuntu-jammy-kernel.git] / drivers / leds / leds-lm3692x.c

// SPDX-License-Identifier: GPL-2.0
// TI LM3692x LED chip family driver
// Copyright (C) 2017-18 Texas Instruments Incorporated - http://www.ti.com/

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

#define LM36922_MODEL	0
#define LM36923_MODEL	1

#define LM3692X_REV		0x0
#define LM3692X_RESET		0x1
#define LM3692X_EN		0x10
#define LM3692X_BRT_CTRL	0x11
#define LM3692X_PWM_CTRL	0x12
#define LM3692X_BOOST_CTRL	0x13
#define LM3692X_AUTO_FREQ_HI	0x15
#define LM3692X_AUTO_FREQ_LO	0x16
#define LM3692X_BL_ADJ_THRESH	0x17
#define LM3692X_BRT_LSB		0x18
#define LM3692X_BRT_MSB		0x19
#define LM3692X_FAULT_CTRL	0x1e
#define LM3692X_FAULT_FLAGS	0x1f

#define LM3692X_SW_RESET	BIT(0)
#define LM3692X_DEVICE_EN	BIT(0)
#define LM3692X_LED1_EN		BIT(1)
#define LM3692X_LED2_EN		BIT(2)
#define LM36923_LED3_EN		BIT(3)
#define LM3692X_ENABLE_MASK	(LM3692X_DEVICE_EN | LM3692X_LED1_EN | \
				 LM3692X_LED2_EN | LM36923_LED3_EN)

/* Brightness Control Bits */
#define LM3692X_BL_ADJ_POL	BIT(0)
#define LM3692X_RAMP_RATE_125us	0x00
#define LM3692X_RAMP_RATE_250us	BIT(1)
#define LM3692X_RAMP_RATE_500us BIT(2)
#define LM3692X_RAMP_RATE_1ms	(BIT(1) | BIT(2))
#define LM3692X_RAMP_RATE_2ms	BIT(3)
#define LM3692X_RAMP_RATE_4ms	(BIT(3) | BIT(1))
#define LM3692X_RAMP_RATE_8ms	(BIT(2) | BIT(3))
#define LM3692X_RAMP_RATE_16ms	(BIT(1) | BIT(2) | BIT(3))
#define LM3692X_RAMP_EN		BIT(4)
#define LM3692X_BRHT_MODE_REG	0x00
#define LM3692X_BRHT_MODE_PWM	BIT(5)
#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6)
#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) | BIT(6))
#define LM3692X_MAP_MODE_EXP	BIT(7)

/* PWM Register Bits */
#define LM3692X_PWM_FILTER_100	BIT(0)
#define LM3692X_PWM_FILTER_150	BIT(1)
#define LM3692X_PWM_FILTER_200	(BIT(0) | BIT(1))
#define LM3692X_PWM_HYSTER_1LSB BIT(2)
#define LM3692X_PWM_HYSTER_2LSB	BIT(3)
#define LM3692X_PWM_HYSTER_3LSB (BIT(3) | BIT(2))
#define LM3692X_PWM_HYSTER_4LSB BIT(4)
#define LM3692X_PWM_HYSTER_5LSB (BIT(4) | BIT(2))
#define LM3692X_PWM_HYSTER_6LSB (BIT(4) | BIT(3))
#define LM3692X_PWM_POLARITY	BIT(5)
#define LM3692X_PWM_SAMP_4MHZ	BIT(6)
#define LM3692X_PWM_SAMP_24MHZ	BIT(7)

/* Boost Control Bits */
#define LM3692X_OCP_PROT_1A	BIT(0)
#define LM3692X_OCP_PROT_1_25A	BIT(1)
#define LM3692X_OCP_PROT_1_5A	(BIT(0) | BIT(1))
#define LM3692X_OVP_21V		BIT(2)
#define LM3692X_OVP_25V		BIT(3)
#define LM3692X_OVP_29V		(BIT(2) | BIT(3))
#define LM3692X_MIN_IND_22UH	BIT(4)
#define LM3692X_BOOST_SW_1MHZ	BIT(5)
#define LM3692X_BOOST_SW_NO_SHIFT	BIT(6)

/* Fault Control Bits */
#define LM3692X_FAULT_CTRL_OVP BIT(0)
#define LM3692X_FAULT_CTRL_OCP BIT(1)
#define LM3692X_FAULT_CTRL_TSD BIT(2)
#define LM3692X_FAULT_CTRL_OPEN BIT(3)

/* Fault Flag Bits */
#define LM3692X_FAULT_FLAG_OVP BIT(0)
#define LM3692X_FAULT_FLAG_OCP BIT(1)
#define LM3692X_FAULT_FLAG_TSD BIT(2)
#define LM3692X_FAULT_FLAG_SHRT BIT(3)
#define LM3692X_FAULT_FLAG_OPEN BIT(4)

/**
 * struct lm3692x_led -
 * @lock - Lock for reading/writing the device
 * @client - Pointer to the I2C client
 * @led_dev - LED class device pointer
 * @regmap - Devices register map
 * @enable_gpio - VDDIO/EN gpio to enable communication interface
 * @regulator - LED supply regulator pointer
 * @led_enable - LED sync to be enabled
 * @model_id - Current device model ID enumerated
 */
struct lm3692x_led {
	struct mutex lock;
	struct i2c_client *client;
	struct led_classdev led_dev;
	struct regmap *regmap;
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	int led_enable;
	int model_id;
};

static const struct reg_default lm3692x_reg_defs[] = {
	{LM3692X_EN, 0xf},
	{LM3692X_BRT_CTRL, 0x61},
	{LM3692X_PWM_CTRL, 0x73},
	{LM3692X_BOOST_CTRL, 0x6f},
	{LM3692X_AUTO_FREQ_HI, 0x0},
	{LM3692X_AUTO_FREQ_LO, 0x0},
	{LM3692X_BL_ADJ_THRESH, 0x0},
	{LM3692X_BRT_LSB, 0x7},
	{LM3692X_BRT_MSB, 0xff},
	{LM3692X_FAULT_CTRL, 0x7},
};

static const struct regmap_config lm3692x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LM3692X_FAULT_FLAGS,
	.reg_defaults = lm3692x_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs),
	.cache_type = REGCACHE_RBTREE,
};

static int lm3692x_fault_check(struct lm3692x_led *led)
{
	int ret;
	unsigned int read_buf;

	ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
	if (ret)
		return ret;

	if (read_buf)
		dev_err(&led->client->dev, "Detected a fault 0x%X\n", read_buf);

	/* The first read may clear the fault.  Check again to see if the fault
	 * still exits and return that value.
	 */
	regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
	if (read_buf)
		dev_err(&led->client->dev, "Second read of fault flags 0x%X\n",
			read_buf);

	return read_buf;
}

static int lm3692x_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness brt_val)
{
	struct lm3692x_led *led =
			container_of(led_cdev, struct lm3692x_led, led_dev);
	int ret;
	int led_brightness_lsb = (brt_val >> 5);

	mutex_lock(&led->lock);

	ret = lm3692x_fault_check(led);
	if (ret) {
		dev_err(&led->client->dev, "Cannot read/clear faults\n");
		goto out;
	}

	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val);
	if (ret) {
		dev_err(&led->client->dev, "Cannot write MSB\n");
		goto out;
	}

	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb);
	if (ret) {
		dev_err(&led->client->dev, "Cannot write LSB\n");
		goto out;
	}
out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lm3692x_init(struct lm3692x_led *led)
{
	int enable_state;
	int ret;

	if (led->regulator) {
		ret = regulator_enable(led->regulator);
		if (ret) {
			dev_err(&led->client->dev,
				"Failed to enable regulator\n");
			return ret;
		}
	}

	if (led->enable_gpio)
		gpiod_direction_output(led->enable_gpio, 1);

	ret = lm3692x_fault_check(led);
	if (ret) {
		dev_err(&led->client->dev, "Cannot read/clear faults\n");
		goto out;
	}

	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00);
	if (ret)
		goto out;

	/*
	 * For glitch free operation, the following data should
	 * only be written while LEDx enable bits are 0 and the device enable
	 * bit is set to 1.
	 * per Section 7.5.14 of the data sheet
	 */
	ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN);
	if (ret)
		goto out;

	/* Set the brightness to 0 so when enabled the LEDs do not come
	 * on with full brightness.
	 */
	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
		LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
			LM3692X_BRHT_MODE_RAMP_MULTI |
			LM3692X_BL_ADJ_POL |
			LM3692X_RAMP_RATE_250us);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,
			LM3692X_BL_ADJ_POL | LM3692X_PWM_HYSTER_4LSB);
	if (ret)
		goto out;

	switch (led->led_enable) {
	case 0:
	default:
		if (led->model_id == LM36923_MODEL)
			enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN |
			       LM36923_LED3_EN;
		else
			enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN;

		break;
	case 1:
		enable_state = LM3692X_LED1_EN;
		break;
	case 2:
		enable_state = LM3692X_LED2_EN;
		break;

	case 3:
		if (led->model_id == LM36923_MODEL) {
			enable_state = LM36923_LED3_EN;
			break;
		}

		ret = -EINVAL;
		dev_err(&led->client->dev,
			"LED3 sync not available on this device\n");
		goto out;
	}

	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,
				 enable_state | LM3692X_DEVICE_EN);

	return ret;
out:
	dev_err(&led->client->dev, "Fail writing initialization values\n");

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

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

	return ret;
}
static int lm3692x_probe_dt(struct lm3692x_led *led)
{
	struct fwnode_handle *child = NULL;
	struct led_init_data init_data = {};
	int ret;

	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
						   "enable", GPIOD_OUT_LOW);
	if (IS_ERR(led->enable_gpio)) {
		ret = PTR_ERR(led->enable_gpio);
		dev_err(&led->client->dev, "Failed to get enable gpio: %d\n",
			ret);
		return ret;
	}

	led->regulator = devm_regulator_get(&led->client->dev, "vled");
	if (IS_ERR(led->regulator))
		led->regulator = NULL;

	child = device_get_next_child_node(&led->client->dev, child);
	if (!child) {
		dev_err(&led->client->dev, "No LED Child node\n");
		return -ENODEV;
	}

	fwnode_property_read_string(child, "linux,default-trigger",
				    &led->led_dev.default_trigger);

	ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
	if (ret) {
		dev_err(&led->client->dev, "reg DT property missing\n");
		return ret;
	}

	init_data.fwnode = child;
	init_data.devicename = led->client->name;
	init_data.default_label = ":";

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

	return 0;
}

static int lm3692x_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct lm3692x_led *led;
	int ret;

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

	mutex_init(&led->lock);
	led->client = client;
	led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
	led->model_id = id->driver_data;
	i2c_set_clientdata(client, led);

	led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
	if (IS_ERR(led->regmap)) {
		ret = PTR_ERR(led->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = lm3692x_probe_dt(led);
	if (ret)
		return ret;

	ret = lm3692x_init(led);
	if (ret)
		return ret;

	return 0;
}

static int lm3692x_remove(struct i2c_client *client)
{
	struct lm3692x_led *led = i2c_get_clientdata(client);
	int ret;

	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);
	if (ret) {
		dev_err(&led->client->dev, "Failed to disable regulator\n");
		return ret;
	}

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

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

	mutex_destroy(&led->lock);

	return 0;
}

static const struct i2c_device_id lm3692x_id[] = {
	{ "lm36922", LM36922_MODEL },
	{ "lm36923", LM36923_MODEL },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm3692x_id);

static const struct of_device_id of_lm3692x_leds_match[] = {
	{ .compatible = "ti,lm36922", },
	{ .compatible = "ti,lm36923", },
	{},
};
MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match);

static struct i2c_driver lm3692x_driver = {
	.driver = {
		.name	= "lm3692x",
		.of_match_table = of_lm3692x_leds_match,
	},
	.probe		= lm3692x_probe,
	.remove		= lm3692x_remove,
	.id_table	= lm3692x_id,
};
module_i2c_driver(lm3692x_driver);

MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
43d20ff3 DM	1	// SPDX-License-Identifier: GPL-2.0
	2	// TI LM3692x LED chip family driver
	3	// Copyright (C) 2017-18 Texas Instruments Incorporated - http://www.ti.com/
9699cb6b DM	4
	5	#include <linux/gpio/consumer.h>
	6	#include <linux/i2c.h>
	7	#include <linux/init.h>
	8	#include <linux/leds.h>
	9	#include <linux/module.h>
	10	#include <linux/mutex.h>
	11	#include <linux/of.h>
	12	#include <linux/of_gpio.h>
	13	#include <linux/regmap.h>
	14	#include <linux/regulator/consumer.h>
	15	#include <linux/slab.h>
9699cb6b	16
07abd432 DM	17	#define LM36922_MODEL 0
	18	#define LM36923_MODEL 1
	19
9699cb6b DM	20	#define LM3692X_REV 0x0
	21	#define LM3692X_RESET 0x1
	22	#define LM3692X_EN 0x10
	23	#define LM3692X_BRT_CTRL 0x11
	24	#define LM3692X_PWM_CTRL 0x12
	25	#define LM3692X_BOOST_CTRL 0x13
	26	#define LM3692X_AUTO_FREQ_HI 0x15
	27	#define LM3692X_AUTO_FREQ_LO 0x16
	28	#define LM3692X_BL_ADJ_THRESH 0x17
	29	#define LM3692X_BRT_LSB 0x18
	30	#define LM3692X_BRT_MSB 0x19
	31	#define LM3692X_FAULT_CTRL 0x1e
	32	#define LM3692X_FAULT_FLAGS 0x1f
	33
	34	#define LM3692X_SW_RESET BIT(0)
	35	#define LM3692X_DEVICE_EN BIT(0)
	36	#define LM3692X_LED1_EN BIT(1)
	37	#define LM3692X_LED2_EN BIT(2)
07abd432 DM	38	#define LM36923_LED3_EN BIT(3)
	39	#define LM3692X_ENABLE_MASK (LM3692X_DEVICE_EN \| LM3692X_LED1_EN \| \
	40	LM3692X_LED2_EN \| LM36923_LED3_EN)
9699cb6b DM	41
	42	/* Brightness Control Bits */
	43	#define LM3692X_BL_ADJ_POL BIT(0)
	44	#define LM3692X_RAMP_RATE_125us 0x00
	45	#define LM3692X_RAMP_RATE_250us BIT(1)
	46	#define LM3692X_RAMP_RATE_500us BIT(2)
	47	#define LM3692X_RAMP_RATE_1ms (BIT(1) \| BIT(2))
	48	#define LM3692X_RAMP_RATE_2ms BIT(3)
	49	#define LM3692X_RAMP_RATE_4ms (BIT(3) \| BIT(1))
	50	#define LM3692X_RAMP_RATE_8ms (BIT(2) \| BIT(3))
	51	#define LM3692X_RAMP_RATE_16ms (BIT(1) \| BIT(2) \| BIT(3))
	52	#define LM3692X_RAMP_EN BIT(4)
	53	#define LM3692X_BRHT_MODE_REG 0x00
	54	#define LM3692X_BRHT_MODE_PWM BIT(5)
	55	#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6)
	56	#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) \| BIT(6))
	57	#define LM3692X_MAP_MODE_EXP BIT(7)
	58
	59	/* PWM Register Bits */
	60	#define LM3692X_PWM_FILTER_100 BIT(0)
	61	#define LM3692X_PWM_FILTER_150 BIT(1)
	62	#define LM3692X_PWM_FILTER_200 (BIT(0) \| BIT(1))
	63	#define LM3692X_PWM_HYSTER_1LSB BIT(2)
	64	#define LM3692X_PWM_HYSTER_2LSB BIT(3)
	65	#define LM3692X_PWM_HYSTER_3LSB (BIT(3) \| BIT(2))
	66	#define LM3692X_PWM_HYSTER_4LSB BIT(4)
	67	#define LM3692X_PWM_HYSTER_5LSB (BIT(4) \| BIT(2))
	68	#define LM3692X_PWM_HYSTER_6LSB (BIT(4) \| BIT(3))
	69	#define LM3692X_PWM_POLARITY BIT(5)
	70	#define LM3692X_PWM_SAMP_4MHZ BIT(6)
	71	#define LM3692X_PWM_SAMP_24MHZ BIT(7)
	72
	73	/* Boost Control Bits */
	74	#define LM3692X_OCP_PROT_1A BIT(0)
	75	#define LM3692X_OCP_PROT_1_25A BIT(1)
	76	#define LM3692X_OCP_PROT_1_5A (BIT(0) \| BIT(1))
	77	#define LM3692X_OVP_21V BIT(2)
	78	#define LM3692X_OVP_25V BIT(3)
	79	#define LM3692X_OVP_29V (BIT(2) \| BIT(3))
	80	#define LM3692X_MIN_IND_22UH BIT(4)
	81	#define LM3692X_BOOST_SW_1MHZ BIT(5)
	82	#define LM3692X_BOOST_SW_NO_SHIFT BIT(6)
	83
	84	/* Fault Control Bits */
	85	#define LM3692X_FAULT_CTRL_OVP BIT(0)
	86	#define LM3692X_FAULT_CTRL_OCP BIT(1)
	87	#define LM3692X_FAULT_CTRL_TSD BIT(2)
	88	#define LM3692X_FAULT_CTRL_OPEN BIT(3)
	89
	90	/* Fault Flag Bits */
	91	#define LM3692X_FAULT_FLAG_OVP BIT(0)
	92	#define LM3692X_FAULT_FLAG_OCP BIT(1)
	93	#define LM3692X_FAULT_FLAG_TSD BIT(2)
	94	#define LM3692X_FAULT_FLAG_SHRT BIT(3)
	95	#define LM3692X_FAULT_FLAG_OPEN BIT(4)
	96
	97	/**
	98	* struct lm3692x_led -
	99	* @lock - Lock for reading/writing the device
	100	* @client - Pointer to the I2C client
	101	* @led_dev - LED class device pointer
	102	* @regmap - Devices register map
	103	* @enable_gpio - VDDIO/EN gpio to enable communication interface
	104	* @regulator - LED supply regulator pointer
07abd432 DM	105	* @led_enable - LED sync to be enabled
07abd432 DM	106	* @model_id - Current device model ID enumerated
9699cb6b DM	107	*/
	108	struct lm3692x_led {
	109	struct mutex lock;
	110	struct i2c_client *client;
	111	struct led_classdev led_dev;
	112	struct regmap *regmap;
	113	struct gpio_desc *enable_gpio;
	114	struct regulator *regulator;
07abd432 DM	115	int led_enable;
07abd432 DM	116	int model_id;
9699cb6b DM	117	};
	118
	119	static const struct reg_default lm3692x_reg_defs[] = {
	120	{LM3692X_EN, 0xf},
	121	{LM3692X_BRT_CTRL, 0x61},
	122	{LM3692X_PWM_CTRL, 0x73},
	123	{LM3692X_BOOST_CTRL, 0x6f},
	124	{LM3692X_AUTO_FREQ_HI, 0x0},
	125	{LM3692X_AUTO_FREQ_LO, 0x0},
	126	{LM3692X_BL_ADJ_THRESH, 0x0},
	127	{LM3692X_BRT_LSB, 0x7},
	128	{LM3692X_BRT_MSB, 0xff},
	129	{LM3692X_FAULT_CTRL, 0x7},
	130	};
	131
	132	static const struct regmap_config lm3692x_regmap_config = {
	133	.reg_bits = 8,
	134	.val_bits = 8,
	135
	136	.max_register = LM3692X_FAULT_FLAGS,
	137	.reg_defaults = lm3692x_reg_defs,
	138	.num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs),
	139	.cache_type = REGCACHE_RBTREE,
	140	};
	141
	142	static int lm3692x_fault_check(struct lm3692x_led *led)
	143	{
	144	int ret;
	145	unsigned int read_buf;
	146
	147	ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
	148	if (ret)
	149	return ret;
	150
	151	if (read_buf)
	152	dev_err(&led->client->dev, "Detected a fault 0x%X\n", read_buf);
	153
	154	/* The first read may clear the fault. Check again to see if the fault
	155	* still exits and return that value.
	156	*/
	157	regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
	158	if (read_buf)
	159	dev_err(&led->client->dev, "Second read of fault flags 0x%X\n",
	160	read_buf);
	161
	162	return read_buf;
	163	}
	164
	165	static int lm3692x_brightness_set(struct led_classdev *led_cdev,
	166	enum led_brightness brt_val)
	167	{
	168	struct lm3692x_led *led =
	169	container_of(led_cdev, struct lm3692x_led, led_dev);
	170	int ret;
	171	int led_brightness_lsb = (brt_val >> 5);
	172
	173	mutex_lock(&led->lock);
	174
	175	ret = lm3692x_fault_check(led);
	176	if (ret) {
	177	dev_err(&led->client->dev, "Cannot read/clear faults\n");
	178	goto out;
	179	}
	180
181	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val);
182	if (ret) {
183	dev_err(&led->client->dev, "Cannot write MSB\n");
184	goto out;
185	}
186
187	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb);
188	if (ret) {
189	dev_err(&led->client->dev, "Cannot write LSB\n");
190	goto out;
191	}
192	out:
193	mutex_unlock(&led->lock);
194	return ret;
195	}
196
197	static int lm3692x_init(struct lm3692x_led *led)
198	{
07abd432	199	int enable_state;
9699cb6b DM	200	int ret;
	201
	202	if (led->regulator) {
	203	ret = regulator_enable(led->regulator);
	204	if (ret) {
	205	dev_err(&led->client->dev,
	206	"Failed to enable regulator\n");
	207	return ret;
	208	}
	209	}
	210
	211	if (led->enable_gpio)
	212	gpiod_direction_output(led->enable_gpio, 1);
	213
	214	ret = lm3692x_fault_check(led);
	215	if (ret) {
	216	dev_err(&led->client->dev, "Cannot read/clear faults\n");
	217	goto out;
	218	}
	219
	220	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00);
	221	if (ret)
	222	goto out;
	223
	224	/*
	225	* For glitch free operation, the following data should
07abd432 DM	226	* only be written while LEDx enable bits are 0 and the device enable
07abd432 DM	227	* bit is set to 1.
9699cb6b DM	228	* per Section 7.5.14 of the data sheet
9699cb6b DM	229	*/
07abd432 DM	230	ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN);
	231	if (ret)
	232	goto out;
	233
	234	/* Set the brightness to 0 so when enabled the LEDs do not come
	235	* on with full brightness.
	236	*/
	237	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);
	238	if (ret)
	239	goto out;
	240
	241	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);
	242	if (ret)
	243	goto out;
	244
9699cb6b DM	245	ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
	246	LM3692X_PWM_FILTER_100 \| LM3692X_PWM_SAMP_24MHZ);
	247	if (ret)
	248	goto out;
	249
	250	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
	251	LM3692X_BRHT_MODE_RAMP_MULTI \|
	252	LM3692X_BL_ADJ_POL \|
	253	LM3692X_RAMP_RATE_250us);
	254	if (ret)
	255	goto out;
	256
	257	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00);
	258	if (ret)
	259	goto out;
	260
	261	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00);
	262	if (ret)
	263	goto out;
	264
	265	ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00);
	266	if (ret)
	267	goto out;
	268
	269	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,
	270	LM3692X_BL_ADJ_POL \| LM3692X_PWM_HYSTER_4LSB);
	271	if (ret)
	272	goto out;
	273
07abd432 DM	274	switch (led->led_enable) {
	275	case 0:
	276	default:
	277	if (led->model_id == LM36923_MODEL)
	278	enable_state = LM3692X_LED1_EN \| LM3692X_LED2_EN \|
	279	LM36923_LED3_EN;
	280	else
	281	enable_state = LM3692X_LED1_EN \| LM3692X_LED2_EN;
	282
	283	break;
	284	case 1:
	285	enable_state = LM3692X_LED1_EN;
	286	break;
	287	case 2:
	288	enable_state = LM3692X_LED2_EN;
	289	break;
	290
	291	case 3:
	292	if (led->model_id == LM36923_MODEL) {
	293	enable_state = LM36923_LED3_EN;
	294	break;
	295	}
	296
	297	ret = -EINVAL;
	298	dev_err(&led->client->dev,
	299	"LED3 sync not available on this device\n");
	300	goto out;
	301	}
	302
	303	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,
	304	enable_state \| LM3692X_DEVICE_EN);
	305
9699cb6b DM	306	return ret;
	307	out:
	308	dev_err(&led->client->dev, "Fail writing initialization values\n");
	309
	310	if (led->enable_gpio)
	311	gpiod_direction_output(led->enable_gpio, 0);
	312
	313	if (led->regulator) {
	314	ret = regulator_disable(led->regulator);
	315	if (ret)
	316	dev_err(&led->client->dev,
	317	"Failed to disable regulator\n");
	318	}
	319
	320	return ret;
	321	}
07abd432	322	static int lm3692x_probe_dt(struct lm3692x_led *led)
9699cb6b	323	{
9a5c1c64	324	struct fwnode_handle *child = NULL;
a50ff283	325	struct led_init_data init_data = {};
9a5c1c64	326	int ret;
9699cb6b	327
07abd432	328	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
9699cb6b DM	329	"enable", GPIOD_OUT_LOW);
	330	if (IS_ERR(led->enable_gpio)) {
	331	ret = PTR_ERR(led->enable_gpio);
07abd432 DM	332	dev_err(&led->client->dev, "Failed to get enable gpio: %d\n",
07abd432 DM	333	ret);
9699cb6b DM	334	return ret;
	335	}
	336
07abd432	337	led->regulator = devm_regulator_get(&led->client->dev, "vled");
9699cb6b DM	338	if (IS_ERR(led->regulator))
	339	led->regulator = NULL;
	340
9a5c1c64 DM	341	child = device_get_next_child_node(&led->client->dev, child);
	342	if (!child) {
	343	dev_err(&led->client->dev, "No LED Child node\n");
07abd432	344	return -ENODEV;
9a5c1c64 DM	345	}
	346
	347	fwnode_property_read_string(child, "linux,default-trigger",
	348	&led->led_dev.default_trigger);
	349
07abd432 DM	350	ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
	351	if (ret) {
	352	dev_err(&led->client->dev, "reg DT property missing\n");
	353	return ret;
	354	}
	355
a50ff283 JA	356	init_data.fwnode = child;
	357	init_data.devicename = led->client->name;
	358	init_data.default_label = ":";
9a5c1c64	359
a50ff283 JA	360	ret = devm_led_classdev_register_ext(&led->client->dev, &led->led_dev,
a50ff283 JA	361	&init_data);
9699cb6b	362	if (ret) {
07abd432 DM	363	dev_err(&led->client->dev, "led register err: %d\n", ret);
	364	return ret;
	365	}
	366
07abd432 DM	367	return 0;
	368	}
	369
	370	static int lm3692x_probe(struct i2c_client *client,
	371	const struct i2c_device_id *id)
	372	{
	373	struct lm3692x_led *led;
	374	int ret;
	375
	376	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
	377	if (!led)
	378	return -ENOMEM;
	379
	380	mutex_init(&led->lock);
	381	led->client = client;
	382	led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
	383	led->model_id = id->driver_data;
	384	i2c_set_clientdata(client, led);
	385
	386	led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
	387	if (IS_ERR(led->regmap)) {
	388	ret = PTR_ERR(led->regmap);
	389	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	390	ret);
9699cb6b DM	391	return ret;
	392	}
	393
07abd432 DM	394	ret = lm3692x_probe_dt(led);
	395	if (ret)
	396	return ret;
	397
	398	ret = lm3692x_init(led);
	399	if (ret)
	400	return ret;
	401
9699cb6b DM	402	return 0;
	403	}
	404
	405	static int lm3692x_remove(struct i2c_client *client)
	406	{
	407	struct lm3692x_led *led = i2c_get_clientdata(client);
	408	int ret;
	409
07abd432 DM	410	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);
	411	if (ret) {
	412	dev_err(&led->client->dev, "Failed to disable regulator\n");
	413	return ret;
	414	}
	415
9699cb6b DM	416	if (led->enable_gpio)
	417	gpiod_direction_output(led->enable_gpio, 0);
	418
	419	if (led->regulator) {
	420	ret = regulator_disable(led->regulator);
	421	if (ret)
	422	dev_err(&led->client->dev,
	423	"Failed to disable regulator\n");
	424	}
	425
	426	mutex_destroy(&led->lock);
	427
	428	return 0;
	429	}
	430
	431	static const struct i2c_device_id lm3692x_id[] = {
07abd432 DM	432	{ "lm36922", LM36922_MODEL },
07abd432 DM	433	{ "lm36923", LM36923_MODEL },
9699cb6b DM	434	{ }
	435	};
	436	MODULE_DEVICE_TABLE(i2c, lm3692x_id);
	437
	438	static const struct of_device_id of_lm3692x_leds_match[] = {
	439	{ .compatible = "ti,lm36922", },
	440	{ .compatible = "ti,lm36923", },
	441	{},
	442	};
	443	MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match);
	444
	445	static struct i2c_driver lm3692x_driver = {
	446	.driver = {
	447	.name = "lm3692x",
	448	.of_match_table = of_lm3692x_leds_match,
	449	},
	450	.probe = lm3692x_probe,
	451	.remove = lm3692x_remove,
	452	.id_table = lm3692x_id,
	453	};
	454	module_i2c_driver(lm3692x_driver);
	455
	456	MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver");
	457	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
	458	MODULE_LICENSE("GPL v2");