[linux-2.6-block.git] / drivers / leds / leds-lp8860.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI LP8860 4-Channel LED Driver
 *
 * Copyright (C) 2014 Texas Instruments
 *
 * Author: Dan Murphy <dmurphy@ti.com>
 */

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

#define LP8860_DISP_CL1_BRT_MSB		0x00
#define LP8860_DISP_CL1_BRT_LSB		0x01
#define LP8860_DISP_CL1_CURR_MSB	0x02
#define LP8860_DISP_CL1_CURR_LSB	0x03
#define LP8860_CL2_BRT_MSB		0x04
#define LP8860_CL2_BRT_LSB		0x05
#define LP8860_CL2_CURRENT		0x06
#define LP8860_CL3_BRT_MSB		0x07
#define LP8860_CL3_BRT_LSB		0x08
#define LP8860_CL3_CURRENT		0x09
#define LP8860_CL4_BRT_MSB		0x0a
#define LP8860_CL4_BRT_LSB		0x0b
#define LP8860_CL4_CURRENT		0x0c
#define LP8860_CONFIG			0x0d
#define LP8860_STATUS			0x0e
#define LP8860_FAULT			0x0f
#define LP8860_LED_FAULT		0x10
#define LP8860_FAULT_CLEAR		0x11
#define LP8860_ID			0x12
#define LP8860_TEMP_MSB			0x13
#define LP8860_TEMP_LSB			0x14
#define LP8860_DISP_LED_CURR_MSB	0x15
#define LP8860_DISP_LED_CURR_LSB	0x16
#define LP8860_DISP_LED_PWM_MSB		0x17
#define LP8860_DISP_LED_PWM_LSB		0x18
#define LP8860_EEPROM_CNTRL		0x19
#define LP8860_EEPROM_UNLOCK		0x1a

#define LP8860_EEPROM_REG_0		0x60
#define LP8860_EEPROM_REG_1		0x61
#define LP8860_EEPROM_REG_2		0x62
#define LP8860_EEPROM_REG_3		0x63
#define LP8860_EEPROM_REG_4		0x64
#define LP8860_EEPROM_REG_5		0x65
#define LP8860_EEPROM_REG_6		0x66
#define LP8860_EEPROM_REG_7		0x67
#define LP8860_EEPROM_REG_8		0x68
#define LP8860_EEPROM_REG_9		0x69
#define LP8860_EEPROM_REG_10		0x6a
#define LP8860_EEPROM_REG_11		0x6b
#define LP8860_EEPROM_REG_12		0x6c
#define LP8860_EEPROM_REG_13		0x6d
#define LP8860_EEPROM_REG_14		0x6e
#define LP8860_EEPROM_REG_15		0x6f
#define LP8860_EEPROM_REG_16		0x70
#define LP8860_EEPROM_REG_17		0x71
#define LP8860_EEPROM_REG_18		0x72
#define LP8860_EEPROM_REG_19		0x73
#define LP8860_EEPROM_REG_20		0x74
#define LP8860_EEPROM_REG_21		0x75
#define LP8860_EEPROM_REG_22		0x76
#define LP8860_EEPROM_REG_23		0x77
#define LP8860_EEPROM_REG_24		0x78

#define LP8860_LOCK_EEPROM		0x00
#define LP8860_UNLOCK_EEPROM		0x01
#define LP8860_PROGRAM_EEPROM		0x02
#define LP8860_EEPROM_CODE_1		0x08
#define LP8860_EEPROM_CODE_2		0xba
#define LP8860_EEPROM_CODE_3		0xef

#define LP8860_CLEAR_FAULTS		0x01

/**
 * struct lp8860_led -
 * @lock - Lock for reading/writing the device
 * @client - Pointer to the I2C client
 * @led_dev - led class device pointer
 * @regmap - Devices register map
 * @eeprom_regmap - EEPROM register map
 * @enable_gpio - VDDIO/EN gpio to enable communication interface
 * @regulator - LED supply regulator pointer
 * @label - LED label
 */
struct lp8860_led {
	struct mutex lock;
	struct i2c_client *client;
	struct led_classdev led_dev;
	struct regmap *regmap;
	struct regmap *eeprom_regmap;
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	char label[LED_MAX_NAME_SIZE];
};

struct lp8860_eeprom_reg {
	uint8_t reg;
	uint8_t value;
};

static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
	{ LP8860_EEPROM_REG_0, 0xed },
	{ LP8860_EEPROM_REG_1, 0xdf },
	{ LP8860_EEPROM_REG_2, 0xdc },
	{ LP8860_EEPROM_REG_3, 0xf0 },
	{ LP8860_EEPROM_REG_4, 0xdf },
	{ LP8860_EEPROM_REG_5, 0xe5 },
	{ LP8860_EEPROM_REG_6, 0xf2 },
	{ LP8860_EEPROM_REG_7, 0x77 },
	{ LP8860_EEPROM_REG_8, 0x77 },
	{ LP8860_EEPROM_REG_9, 0x71 },
	{ LP8860_EEPROM_REG_10, 0x3f },
	{ LP8860_EEPROM_REG_11, 0xb7 },
	{ LP8860_EEPROM_REG_12, 0x17 },
	{ LP8860_EEPROM_REG_13, 0xef },
	{ LP8860_EEPROM_REG_14, 0xb0 },
	{ LP8860_EEPROM_REG_15, 0x87 },
	{ LP8860_EEPROM_REG_16, 0xce },
	{ LP8860_EEPROM_REG_17, 0x72 },
	{ LP8860_EEPROM_REG_18, 0xe5 },
	{ LP8860_EEPROM_REG_19, 0xdf },
	{ LP8860_EEPROM_REG_20, 0x35 },
	{ LP8860_EEPROM_REG_21, 0x06 },
	{ LP8860_EEPROM_REG_22, 0xdc },
	{ LP8860_EEPROM_REG_23, 0x88 },
	{ LP8860_EEPROM_REG_24, 0x3E },
};

static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
{
	int ret;

	mutex_lock(&led->lock);

	if (lock == LP8860_UNLOCK_EEPROM) {
		ret = regmap_write(led->regmap,
			LP8860_EEPROM_UNLOCK,
			LP8860_EEPROM_CODE_1);
		if (ret) {
			dev_err(&led->client->dev, "EEPROM Unlock failed\n");
			goto out;
		}

		ret = regmap_write(led->regmap,
			LP8860_EEPROM_UNLOCK,
			LP8860_EEPROM_CODE_2);
		if (ret) {
			dev_err(&led->client->dev, "EEPROM Unlock failed\n");
			goto out;
		}
		ret = regmap_write(led->regmap,
			LP8860_EEPROM_UNLOCK,
			LP8860_EEPROM_CODE_3);
		if (ret) {
			dev_err(&led->client->dev, "EEPROM Unlock failed\n");
			goto out;
		}
	} else {
		ret = regmap_write(led->regmap,
			LP8860_EEPROM_UNLOCK,
			LP8860_LOCK_EEPROM);
	}

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

static int lp8860_fault_check(struct lp8860_led *led)
{
	int ret, fault;
	unsigned int read_buf;

	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
	if (ret)
		goto out;

	fault = read_buf;

	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
	if (ret)
		goto out;

	fault |= read_buf;

	/* Attempt to clear any faults */
	if (fault)
		ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
			LP8860_CLEAR_FAULTS);
out:
	return ret;
}

static int lp8860_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness brt_val)
{
	struct lp8860_led *led =
			container_of(led_cdev, struct lp8860_led, led_dev);
	int disp_brightness = brt_val * 255;
	int ret;

	mutex_lock(&led->lock);

	ret = lp8860_fault_check(led);
	if (ret) {
		dev_err(&led->client->dev, "Cannot read/clear faults\n");
		goto out;
	}

	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
			(disp_brightness & 0xff00) >> 8);
	if (ret) {
		dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
		goto out;
	}

	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
			disp_brightness & 0xff);
	if (ret) {
		dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
		goto out;
	}
out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lp8860_init(struct lp8860_led *led)
{
	unsigned int read_buf;
	int ret, i, reg_count;

	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 = lp8860_fault_check(led);
	if (ret)
		goto out;

	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
	if (ret)
		goto out;

	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
	if (ret) {
		dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
		goto out;
	}

	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
	for (i = 0; i < reg_count; i++) {
		ret = regmap_write(led->eeprom_regmap,
				lp8860_eeprom_disp_regs[i].reg,
				lp8860_eeprom_disp_regs[i].value);
		if (ret) {
			dev_err(&led->client->dev, "Failed writing EEPROM\n");
			goto out;
		}
	}

	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
	if (ret)
		goto out;

	ret = regmap_write(led->regmap,
			LP8860_EEPROM_CNTRL,
			LP8860_PROGRAM_EEPROM);
	if (ret) {
		dev_err(&led->client->dev, "Failed programming EEPROM\n");
		goto out;
	}

	return ret;

out:
	if (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");
	}

	return ret;
}

static const struct reg_default lp8860_reg_defs[] = {
	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
	{ LP8860_CL2_BRT_MSB, 0x00},
	{ LP8860_CL2_BRT_LSB, 0x00},
	{ LP8860_CL2_CURRENT, 0x00},
	{ LP8860_CL3_BRT_MSB, 0x00},
	{ LP8860_CL3_BRT_LSB, 0x00},
	{ LP8860_CL3_CURRENT, 0x00},
	{ LP8860_CL4_BRT_MSB, 0x00},
	{ LP8860_CL4_BRT_LSB, 0x00},
	{ LP8860_CL4_CURRENT, 0x00},
	{ LP8860_CONFIG, 0x00},
	{ LP8860_FAULT_CLEAR, 0x00},
	{ LP8860_EEPROM_CNTRL, 0x80},
	{ LP8860_EEPROM_UNLOCK, 0x00},
};

static const struct regmap_config lp8860_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LP8860_EEPROM_UNLOCK,
	.reg_defaults = lp8860_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
	.cache_type = REGCACHE_NONE,
};

static const struct reg_default lp8860_eeprom_defs[] = {
	{ LP8860_EEPROM_REG_0, 0x00 },
	{ LP8860_EEPROM_REG_1, 0x00 },
	{ LP8860_EEPROM_REG_2, 0x00 },
	{ LP8860_EEPROM_REG_3, 0x00 },
	{ LP8860_EEPROM_REG_4, 0x00 },
	{ LP8860_EEPROM_REG_5, 0x00 },
	{ LP8860_EEPROM_REG_6, 0x00 },
	{ LP8860_EEPROM_REG_7, 0x00 },
	{ LP8860_EEPROM_REG_8, 0x00 },
	{ LP8860_EEPROM_REG_9, 0x00 },
	{ LP8860_EEPROM_REG_10, 0x00 },
	{ LP8860_EEPROM_REG_11, 0x00 },
	{ LP8860_EEPROM_REG_12, 0x00 },
	{ LP8860_EEPROM_REG_13, 0x00 },
	{ LP8860_EEPROM_REG_14, 0x00 },
	{ LP8860_EEPROM_REG_15, 0x00 },
	{ LP8860_EEPROM_REG_16, 0x00 },
	{ LP8860_EEPROM_REG_17, 0x00 },
	{ LP8860_EEPROM_REG_18, 0x00 },
	{ LP8860_EEPROM_REG_19, 0x00 },
	{ LP8860_EEPROM_REG_20, 0x00 },
	{ LP8860_EEPROM_REG_21, 0x00 },
	{ LP8860_EEPROM_REG_22, 0x00 },
	{ LP8860_EEPROM_REG_23, 0x00 },
	{ LP8860_EEPROM_REG_24, 0x00 },
};

static const struct regmap_config lp8860_eeprom_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LP8860_EEPROM_REG_24,
	.reg_defaults = lp8860_eeprom_defs,
	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
	.cache_type = REGCACHE_NONE,
};

static int lp8860_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int ret;
	struct lp8860_led *led;
	struct device_node *np = client->dev.of_node;
	struct device_node *child_node;
	const char *name;

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

	for_each_available_child_of_node(np, child_node) {
		led->led_dev.default_trigger = of_get_property(child_node,
						    "linux,default-trigger",
						    NULL);

		ret = of_property_read_string(child_node, "label", &name);
		if (!ret)
			snprintf(led->label, sizeof(led->label), "%s:%s",
				 id->name, name);
		else
			snprintf(led->label, sizeof(led->label),
				"%s::display_cluster", id->name);
	}

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

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

	led->client = client;
	led->led_dev.name = led->label;
	led->led_dev.brightness_set_blocking = lp8860_brightness_set;

	mutex_init(&led->lock);

	i2c_set_clientdata(client, led);

	led->regmap = devm_regmap_init_i2c(client, &lp8860_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;
	}

	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
	if (IS_ERR(led->eeprom_regmap)) {
		ret = PTR_ERR(led->eeprom_regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = lp8860_init(led);
	if (ret)
		return ret;

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

	return 0;
}

static int lp8860_remove(struct i2c_client *client)
{
	struct lp8860_led *led = i2c_get_clientdata(client);
	int 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 lp8860_id[] = {
	{ "lp8860", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp8860_id);

static const struct of_device_id of_lp8860_leds_match[] = {
	{ .compatible = "ti,lp8860", },
	{},
};
MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);

static struct i2c_driver lp8860_driver = {
	.driver = {
		.name	= "lp8860",
		.of_match_table = of_lp8860_leds_match,
	},
	.probe		= lp8860_probe,
	.remove		= lp8860_remove,
	.id_table	= lp8860_id,
};
module_i2c_driver(lp8860_driver);

MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
7a8685ac DM	2	/*
	3	* TI LP8860 4-Channel LED Driver
	4	*
	5	* Copyright (C) 2014 Texas Instruments
	6	*
	7	* Author: Dan Murphy <dmurphy@ti.com>
7a8685ac DM	8	*/
	9
	10	#include <linux/i2c.h>
	11	#include <linux/init.h>
	12	#include <linux/leds.h>
	13	#include <linux/regmap.h>
	14	#include <linux/regulator/consumer.h>
	15	#include <linux/module.h>
	16	#include <linux/mutex.h>
	17	#include <linux/of.h>
	18	#include <linux/of_gpio.h>
	19	#include <linux/gpio/consumer.h>
	20	#include <linux/slab.h>
c6b218c9	21	#include <uapi/linux/uleds.h>
7a8685ac DM	22
	23	#define LP8860_DISP_CL1_BRT_MSB 0x00
	24	#define LP8860_DISP_CL1_BRT_LSB 0x01
	25	#define LP8860_DISP_CL1_CURR_MSB 0x02
	26	#define LP8860_DISP_CL1_CURR_LSB 0x03
	27	#define LP8860_CL2_BRT_MSB 0x04
	28	#define LP8860_CL2_BRT_LSB 0x05
	29	#define LP8860_CL2_CURRENT 0x06
	30	#define LP8860_CL3_BRT_MSB 0x07
	31	#define LP8860_CL3_BRT_LSB 0x08
	32	#define LP8860_CL3_CURRENT 0x09
	33	#define LP8860_CL4_BRT_MSB 0x0a
	34	#define LP8860_CL4_BRT_LSB 0x0b
	35	#define LP8860_CL4_CURRENT 0x0c
	36	#define LP8860_CONFIG 0x0d
	37	#define LP8860_STATUS 0x0e
	38	#define LP8860_FAULT 0x0f
	39	#define LP8860_LED_FAULT 0x10
	40	#define LP8860_FAULT_CLEAR 0x11
	41	#define LP8860_ID 0x12
	42	#define LP8860_TEMP_MSB 0x13
	43	#define LP8860_TEMP_LSB 0x14
	44	#define LP8860_DISP_LED_CURR_MSB 0x15
	45	#define LP8860_DISP_LED_CURR_LSB 0x16
	46	#define LP8860_DISP_LED_PWM_MSB 0x17
	47	#define LP8860_DISP_LED_PWM_LSB 0x18
	48	#define LP8860_EEPROM_CNTRL 0x19
	49	#define LP8860_EEPROM_UNLOCK 0x1a
	50
	51	#define LP8860_EEPROM_REG_0 0x60
	52	#define LP8860_EEPROM_REG_1 0x61
	53	#define LP8860_EEPROM_REG_2 0x62
	54	#define LP8860_EEPROM_REG_3 0x63
	55	#define LP8860_EEPROM_REG_4 0x64
	56	#define LP8860_EEPROM_REG_5 0x65
	57	#define LP8860_EEPROM_REG_6 0x66
	58	#define LP8860_EEPROM_REG_7 0x67
	59	#define LP8860_EEPROM_REG_8 0x68
	60	#define LP8860_EEPROM_REG_9 0x69
	61	#define LP8860_EEPROM_REG_10 0x6a
	62	#define LP8860_EEPROM_REG_11 0x6b
	63	#define LP8860_EEPROM_REG_12 0x6c
	64	#define LP8860_EEPROM_REG_13 0x6d
	65	#define LP8860_EEPROM_REG_14 0x6e
	66	#define LP8860_EEPROM_REG_15 0x6f
	67	#define LP8860_EEPROM_REG_16 0x70
	68	#define LP8860_EEPROM_REG_17 0x71
	69	#define LP8860_EEPROM_REG_18 0x72
	70	#define LP8860_EEPROM_REG_19 0x73
	71	#define LP8860_EEPROM_REG_20 0x74
	72	#define LP8860_EEPROM_REG_21 0x75
	73	#define LP8860_EEPROM_REG_22 0x76
	74	#define LP8860_EEPROM_REG_23 0x77
	75	#define LP8860_EEPROM_REG_24 0x78
	76
	77	#define LP8860_LOCK_EEPROM 0x00
	78	#define LP8860_UNLOCK_EEPROM 0x01
	79	#define LP8860_PROGRAM_EEPROM 0x02
	80	#define LP8860_EEPROM_CODE_1 0x08
	81	#define LP8860_EEPROM_CODE_2 0xba
	82	#define LP8860_EEPROM_CODE_3 0xef
	83
	84	#define LP8860_CLEAR_FAULTS 0x01
	85
7a8685ac DM	86	/**
	87	* struct lp8860_led -
	88	* @lock - Lock for reading/writing the device
7a8685ac DM	89	* @client - Pointer to the I2C client
	90	* @led_dev - led class device pointer
	91	* @regmap - Devices register map
	92	* @eeprom_regmap - EEPROM register map
	93	* @enable_gpio - VDDIO/EN gpio to enable communication interface
	94	* @regulator - LED supply regulator pointer
7a8685ac	95	* @label - LED label
8a7a76c8	96	*/
7a8685ac DM	97	struct lp8860_led {
7a8685ac DM	98	struct mutex lock;
7a8685ac DM	99	struct i2c_client *client;
	100	struct led_classdev led_dev;
	101	struct regmap *regmap;
	102	struct regmap *eeprom_regmap;
	103	struct gpio_desc *enable_gpio;
	104	struct regulator *regulator;
c6b218c9	105	char label[LED_MAX_NAME_SIZE];
7a8685ac DM	106	};
	107
	108	struct lp8860_eeprom_reg {
	109	uint8_t reg;
	110	uint8_t value;
	111	};
	112
	113	static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
	114	{ LP8860_EEPROM_REG_0, 0xed },
	115	{ LP8860_EEPROM_REG_1, 0xdf },
	116	{ LP8860_EEPROM_REG_2, 0xdc },
	117	{ LP8860_EEPROM_REG_3, 0xf0 },
	118	{ LP8860_EEPROM_REG_4, 0xdf },
	119	{ LP8860_EEPROM_REG_5, 0xe5 },
	120	{ LP8860_EEPROM_REG_6, 0xf2 },
	121	{ LP8860_EEPROM_REG_7, 0x77 },
	122	{ LP8860_EEPROM_REG_8, 0x77 },
	123	{ LP8860_EEPROM_REG_9, 0x71 },
	124	{ LP8860_EEPROM_REG_10, 0x3f },
	125	{ LP8860_EEPROM_REG_11, 0xb7 },
	126	{ LP8860_EEPROM_REG_12, 0x17 },
	127	{ LP8860_EEPROM_REG_13, 0xef },
	128	{ LP8860_EEPROM_REG_14, 0xb0 },
	129	{ LP8860_EEPROM_REG_15, 0x87 },
	130	{ LP8860_EEPROM_REG_16, 0xce },
	131	{ LP8860_EEPROM_REG_17, 0x72 },
	132	{ LP8860_EEPROM_REG_18, 0xe5 },
	133	{ LP8860_EEPROM_REG_19, 0xdf },
	134	{ LP8860_EEPROM_REG_20, 0x35 },
	135	{ LP8860_EEPROM_REG_21, 0x06 },
	136	{ LP8860_EEPROM_REG_22, 0xdc },
	137	{ LP8860_EEPROM_REG_23, 0x88 },
	138	{ LP8860_EEPROM_REG_24, 0x3E },
	139	};
	140
	141	static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
	142	{
	143	int ret;
	144
	145	mutex_lock(&led->lock);
	146
	147	if (lock == LP8860_UNLOCK_EEPROM) {
	148	ret = regmap_write(led->regmap,
	149	LP8860_EEPROM_UNLOCK,
	150	LP8860_EEPROM_CODE_1);
	151	if (ret) {
	152	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	153	goto out;
	154	}
	155
	156	ret = regmap_write(led->regmap,
	157	LP8860_EEPROM_UNLOCK,
	158	LP8860_EEPROM_CODE_2);
	159	if (ret) {
	160	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	161	goto out;
	162	}
	163	ret = regmap_write(led->regmap,
	164	LP8860_EEPROM_UNLOCK,
	165	LP8860_EEPROM_CODE_3);
	166	if (ret) {
	167	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	168	goto out;
	169	}
170	} else {
171	ret = regmap_write(led->regmap,
172	LP8860_EEPROM_UNLOCK,
173	LP8860_LOCK_EEPROM);
174	}
175
176	out:
177	mutex_unlock(&led->lock);
178	return ret;
179	}
180
181	static int lp8860_fault_check(struct lp8860_led *led)
182	{
183	int ret, fault;
184	unsigned int read_buf;
185
186	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
187	if (ret)
188	goto out;
189
190	fault = read_buf;
191
192	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
193	if (ret)
194	goto out;
195
196	fault \|= read_buf;
197
198	/* Attempt to clear any faults */
199	if (fault)
200	ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
201	LP8860_CLEAR_FAULTS);
202	out:
203	return ret;
204	}
205
7c4b10a2 AL	206	static int lp8860_brightness_set(struct led_classdev *led_cdev,
7c4b10a2 AL	207	enum led_brightness brt_val)
7a8685ac	208	{
7c4b10a2 AL	209	struct lp8860_led *led =
	210	container_of(led_cdev, struct lp8860_led, led_dev);
	211	int disp_brightness = brt_val * 255;
7a8685ac	212	int ret;
7a8685ac DM	213
	214	mutex_lock(&led->lock);
	215
	216	ret = lp8860_fault_check(led);
	217	if (ret) {
	218	dev_err(&led->client->dev, "Cannot read/clear faults\n");
	219	goto out;
	220	}
	221
	222	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
	223	(disp_brightness & 0xff00) >> 8);
	224	if (ret) {
	225	dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
	226	goto out;
	227	}
	228
	229	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
	230	disp_brightness & 0xff);
	231	if (ret) {
	232	dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
	233	goto out;
	234	}
	235	out:
	236	mutex_unlock(&led->lock);
7c4b10a2	237	return ret;
7a8685ac DM	238	}
	239
	240	static int lp8860_init(struct lp8860_led *led)
	241	{
	242	unsigned int read_buf;
	243	int ret, i, reg_count;
	244
b12ef03a DM	245	if (led->regulator) {
	246	ret = regulator_enable(led->regulator);
	247	if (ret) {
	248	dev_err(&led->client->dev,
	249	"Failed to enable regulator\n");
	250	return ret;
	251	}
	252	}
	253
7a8685ac DM	254	if (led->enable_gpio)
	255	gpiod_direction_output(led->enable_gpio, 1);
	256
	257	ret = lp8860_fault_check(led);
	258	if (ret)
	259	goto out;
	260
	261	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
	262	if (ret)
	263	goto out;
	264
	265	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
	266	if (ret) {
	267	dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
	268	goto out;
	269	}
	270
	271	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
	272	for (i = 0; i < reg_count; i++) {
	273	ret = regmap_write(led->eeprom_regmap,
	274	lp8860_eeprom_disp_regs[i].reg,
	275	lp8860_eeprom_disp_regs[i].value);
	276	if (ret) {
	277	dev_err(&led->client->dev, "Failed writing EEPROM\n");
	278	goto out;
	279	}
	280	}
	281
	282	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
	283	if (ret)
	284	goto out;
	285
	286	ret = regmap_write(led->regmap,
	287	LP8860_EEPROM_CNTRL,
	288	LP8860_PROGRAM_EEPROM);
b12ef03a	289	if (ret) {
7a8685ac	290	dev_err(&led->client->dev, "Failed programming EEPROM\n");
b12ef03a DM	291	goto out;
	292	}
	293
	294	return ret;
	295
7a8685ac DM	296	out:
	297	if (ret)
	298	if (led->enable_gpio)
	299	gpiod_direction_output(led->enable_gpio, 0);
b12ef03a DM	300
	301	if (led->regulator) {
	302	ret = regulator_disable(led->regulator);
	303	if (ret)
	304	dev_err(&led->client->dev,
	305	"Failed to disable regulator\n");
	306	}
	307
7a8685ac DM	308	return ret;
	309	}
	310
de88e71a	311	static const struct reg_default lp8860_reg_defs[] = {
7a8685ac DM	312	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
	313	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
	314	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
	315	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
	316	{ LP8860_CL2_BRT_MSB, 0x00},
	317	{ LP8860_CL2_BRT_LSB, 0x00},
	318	{ LP8860_CL2_CURRENT, 0x00},
	319	{ LP8860_CL3_BRT_MSB, 0x00},
	320	{ LP8860_CL3_BRT_LSB, 0x00},
	321	{ LP8860_CL3_CURRENT, 0x00},
	322	{ LP8860_CL4_BRT_MSB, 0x00},
	323	{ LP8860_CL4_BRT_LSB, 0x00},
	324	{ LP8860_CL4_CURRENT, 0x00},
	325	{ LP8860_CONFIG, 0x00},
	326	{ LP8860_FAULT_CLEAR, 0x00},
	327	{ LP8860_EEPROM_CNTRL, 0x80},
	328	{ LP8860_EEPROM_UNLOCK, 0x00},
	329	};
	330
	331	static const struct regmap_config lp8860_regmap_config = {
	332	.reg_bits = 8,
	333	.val_bits = 8,
	334
	335	.max_register = LP8860_EEPROM_UNLOCK,
	336	.reg_defaults = lp8860_reg_defs,
	337	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
	338	.cache_type = REGCACHE_NONE,
	339	};
	340
de88e71a	341	static const struct reg_default lp8860_eeprom_defs[] = {
7a8685ac DM	342	{ LP8860_EEPROM_REG_0, 0x00 },
	343	{ LP8860_EEPROM_REG_1, 0x00 },
	344	{ LP8860_EEPROM_REG_2, 0x00 },
	345	{ LP8860_EEPROM_REG_3, 0x00 },
	346	{ LP8860_EEPROM_REG_4, 0x00 },
	347	{ LP8860_EEPROM_REG_5, 0x00 },
	348	{ LP8860_EEPROM_REG_6, 0x00 },
	349	{ LP8860_EEPROM_REG_7, 0x00 },
	350	{ LP8860_EEPROM_REG_8, 0x00 },
	351	{ LP8860_EEPROM_REG_9, 0x00 },
	352	{ LP8860_EEPROM_REG_10, 0x00 },
	353	{ LP8860_EEPROM_REG_11, 0x00 },
	354	{ LP8860_EEPROM_REG_12, 0x00 },
	355	{ LP8860_EEPROM_REG_13, 0x00 },
	356	{ LP8860_EEPROM_REG_14, 0x00 },
	357	{ LP8860_EEPROM_REG_15, 0x00 },
	358	{ LP8860_EEPROM_REG_16, 0x00 },
	359	{ LP8860_EEPROM_REG_17, 0x00 },
	360	{ LP8860_EEPROM_REG_18, 0x00 },
	361	{ LP8860_EEPROM_REG_19, 0x00 },
	362	{ LP8860_EEPROM_REG_20, 0x00 },
	363	{ LP8860_EEPROM_REG_21, 0x00 },
	364	{ LP8860_EEPROM_REG_22, 0x00 },
	365	{ LP8860_EEPROM_REG_23, 0x00 },
	366	{ LP8860_EEPROM_REG_24, 0x00 },
	367	};
	368
	369	static const struct regmap_config lp8860_eeprom_regmap_config = {
	370	.reg_bits = 8,
	371	.val_bits = 8,
	372
	373	.max_register = LP8860_EEPROM_REG_24,
	374	.reg_defaults = lp8860_eeprom_defs,
	375	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
	376	.cache_type = REGCACHE_NONE,
	377	};
	378
	379	static int lp8860_probe(struct i2c_client *client,
	380	const struct i2c_device_id *id)
	381	{
	382	int ret;
	383	struct lp8860_led *led;
	384	struct device_node *np = client->dev.of_node;
c6b218c9 DM	385	struct device_node *child_node;
c6b218c9 DM	386	const char *name;
7a8685ac DM	387
	388	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
	389	if (!led)
	390	return -ENOMEM;
	391
c6b218c9	392	for_each_available_child_of_node(np, child_node) {
50aa46c4 DM	393	led->led_dev.default_trigger = of_get_property(child_node,
	394	"linux,default-trigger",
	395	NULL);
	396
c6b218c9 DM	397	ret = of_property_read_string(child_node, "label", &name);
	398	if (!ret)
	399	snprintf(led->label, sizeof(led->label), "%s:%s",
	400	id->name, name);
	401	else
	402	snprintf(led->label, sizeof(led->label),
	403	"%s::display_cluster", id->name);
7a8685ac DM	404	}
7a8685ac DM	405
eb2294c3 UKK	406	led->enable_gpio = devm_gpiod_get_optional(&client->dev,
	407	"enable", GPIOD_OUT_LOW);
	408	if (IS_ERR(led->enable_gpio)) {
	409	ret = PTR_ERR(led->enable_gpio);
	410	dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
	411	return ret;
	412	}
7a8685ac DM	413
	414	led->regulator = devm_regulator_get(&client->dev, "vled");
	415	if (IS_ERR(led->regulator))
	416	led->regulator = NULL;
	417
	418	led->client = client;
	419	led->led_dev.name = led->label;
7c4b10a2	420	led->led_dev.brightness_set_blocking = lp8860_brightness_set;
7a8685ac DM	421
7a8685ac DM	422	mutex_init(&led->lock);
7a8685ac DM	423
	424	i2c_set_clientdata(client, led);
	425
	426	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
	427	if (IS_ERR(led->regmap)) {
	428	ret = PTR_ERR(led->regmap);
	429	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	430	ret);
	431	return ret;
	432	}
	433
	434	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
	435	if (IS_ERR(led->eeprom_regmap)) {
	436	ret = PTR_ERR(led->eeprom_regmap);
	437	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	438	ret);
	439	return ret;
	440	}
	441
	442	ret = lp8860_init(led);
	443	if (ret)
	444	return ret;
	445
a2169c9b	446	ret = devm_led_classdev_register(&client->dev, &led->led_dev);
7a8685ac DM	447	if (ret) {
	448	dev_err(&client->dev, "led register err: %d\n", ret);
	449	return ret;
	450	}
	451
	452	return 0;
	453	}
	454
	455	static int lp8860_remove(struct i2c_client *client)
	456	{
	457	struct lp8860_led *led = i2c_get_clientdata(client);
	458	int ret;
	459
7a8685ac DM	460	if (led->enable_gpio)
	461	gpiod_direction_output(led->enable_gpio, 0);
	462
	463	if (led->regulator) {
	464	ret = regulator_disable(led->regulator);
	465	if (ret)
	466	dev_err(&led->client->dev,
	467	"Failed to disable regulator\n");
	468	}
	469
a2169c9b DM	470	mutex_destroy(&led->lock);
a2169c9b DM	471
7a8685ac DM	472	return 0;
	473	}
	474
	475	static const struct i2c_device_id lp8860_id[] = {
	476	{ "lp8860", 0 },
	477	{ }
	478	};
	479	MODULE_DEVICE_TABLE(i2c, lp8860_id);
	480
7a8685ac DM	481	static const struct of_device_id of_lp8860_leds_match[] = {
	482	{ .compatible = "ti,lp8860", },
	483	{},
	484	};
	485	MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
7a8685ac DM	486
	487	static struct i2c_driver lp8860_driver = {
	488	.driver = {
	489	.name = "lp8860",
a2169c9b	490	.of_match_table = of_lp8860_leds_match,
7a8685ac DM	491	},
	492	.probe = lp8860_probe,
	493	.remove = lp8860_remove,
	494	.id_table = lp8860_id,
	495	};
	496	module_i2c_driver(lp8860_driver);
	497
5ee047fb	498	MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
7a8685ac	499	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
a2169c9b	500	MODULE_LICENSE("GPL v2");