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

/*
 * TI LP8860 4-Channel LED Driver
 *
 * Copyright (C) 2014 Texas Instruments
 *
 * Author: Dan Murphy <dmurphy@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 */

#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>

#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

#define LP8860_DISP_LED_NAME		"display_cluster"

/**
 * 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;
	const char *label;
};

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->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");
out:
	if (ret)
		if (led->enable_gpio)
			gpiod_direction_output(led->enable_gpio, 0);
	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;

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

	led->label = LP8860_DISP_LED_NAME;

	if (client->dev.of_node) {
		ret = of_property_read_string(np, "label", &led->label);
		if (ret) {
			dev_err(&client->dev, "Missing label in dt\n");
			return -EINVAL;
		}
	}

	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.max_brightness = LED_FULL;
	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 = 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;

	led_classdev_unregister(&led->led_dev);

	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 0;
}

static const struct i2c_device_id lp8860_id[] = {
	{ "lp8860", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp8860_id);

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

static struct i2c_driver lp8860_driver = {
	.driver = {
		.name	= "lp8860",
		.of_match_table = of_match_ptr(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");
Commit	Line	Data
7a8685ac DM	1	/*
	2	* TI LP8860 4-Channel LED Driver
	3	*
	4	* Copyright (C) 2014 Texas Instruments
	5	*
	6	* Author: Dan Murphy <dmurphy@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/i2c.h>
	15	#include <linux/init.h>
	16	#include <linux/leds.h>
	17	#include <linux/regmap.h>
	18	#include <linux/regulator/consumer.h>
	19	#include <linux/module.h>
	20	#include <linux/mutex.h>
	21	#include <linux/of.h>
	22	#include <linux/of_gpio.h>
	23	#include <linux/gpio/consumer.h>
	24	#include <linux/slab.h>
	25
	26	#define LP8860_DISP_CL1_BRT_MSB 0x00
	27	#define LP8860_DISP_CL1_BRT_LSB 0x01
	28	#define LP8860_DISP_CL1_CURR_MSB 0x02
	29	#define LP8860_DISP_CL1_CURR_LSB 0x03
	30	#define LP8860_CL2_BRT_MSB 0x04
	31	#define LP8860_CL2_BRT_LSB 0x05
	32	#define LP8860_CL2_CURRENT 0x06
	33	#define LP8860_CL3_BRT_MSB 0x07
	34	#define LP8860_CL3_BRT_LSB 0x08
	35	#define LP8860_CL3_CURRENT 0x09
	36	#define LP8860_CL4_BRT_MSB 0x0a
	37	#define LP8860_CL4_BRT_LSB 0x0b
	38	#define LP8860_CL4_CURRENT 0x0c
	39	#define LP8860_CONFIG 0x0d
	40	#define LP8860_STATUS 0x0e
	41	#define LP8860_FAULT 0x0f
	42	#define LP8860_LED_FAULT 0x10
	43	#define LP8860_FAULT_CLEAR 0x11
	44	#define LP8860_ID 0x12
	45	#define LP8860_TEMP_MSB 0x13
	46	#define LP8860_TEMP_LSB 0x14
	47	#define LP8860_DISP_LED_CURR_MSB 0x15
	48	#define LP8860_DISP_LED_CURR_LSB 0x16
	49	#define LP8860_DISP_LED_PWM_MSB 0x17
	50	#define LP8860_DISP_LED_PWM_LSB 0x18
	51	#define LP8860_EEPROM_CNTRL 0x19
	52	#define LP8860_EEPROM_UNLOCK 0x1a
	53
	54	#define LP8860_EEPROM_REG_0 0x60
	55	#define LP8860_EEPROM_REG_1 0x61
	56	#define LP8860_EEPROM_REG_2 0x62
	57	#define LP8860_EEPROM_REG_3 0x63
	58	#define LP8860_EEPROM_REG_4 0x64
	59	#define LP8860_EEPROM_REG_5 0x65
	60	#define LP8860_EEPROM_REG_6 0x66
	61	#define LP8860_EEPROM_REG_7 0x67
	62	#define LP8860_EEPROM_REG_8 0x68
	63	#define LP8860_EEPROM_REG_9 0x69
	64	#define LP8860_EEPROM_REG_10 0x6a
65	#define LP8860_EEPROM_REG_11 0x6b
66	#define LP8860_EEPROM_REG_12 0x6c
67	#define LP8860_EEPROM_REG_13 0x6d
68	#define LP8860_EEPROM_REG_14 0x6e
69	#define LP8860_EEPROM_REG_15 0x6f
70	#define LP8860_EEPROM_REG_16 0x70
71	#define LP8860_EEPROM_REG_17 0x71
72	#define LP8860_EEPROM_REG_18 0x72
73	#define LP8860_EEPROM_REG_19 0x73
74	#define LP8860_EEPROM_REG_20 0x74
75	#define LP8860_EEPROM_REG_21 0x75
76	#define LP8860_EEPROM_REG_22 0x76
77	#define LP8860_EEPROM_REG_23 0x77
78	#define LP8860_EEPROM_REG_24 0x78
79
80	#define LP8860_LOCK_EEPROM 0x00
81	#define LP8860_UNLOCK_EEPROM 0x01
82	#define LP8860_PROGRAM_EEPROM 0x02
83	#define LP8860_EEPROM_CODE_1 0x08
84	#define LP8860_EEPROM_CODE_2 0xba
85	#define LP8860_EEPROM_CODE_3 0xef
86
87	#define LP8860_CLEAR_FAULTS 0x01
88
89	#define LP8860_DISP_LED_NAME "display_cluster"
90
91	/**
92	* struct lp8860_led -
93	* @lock - Lock for reading/writing the device
7a8685ac DM	94	* @client - Pointer to the I2C client
	95	* @led_dev - led class device pointer
	96	* @regmap - Devices register map
	97	* @eeprom_regmap - EEPROM register map
	98	* @enable_gpio - VDDIO/EN gpio to enable communication interface
	99	* @regulator - LED supply regulator pointer
7a8685ac DM	100	* @label - LED label
	101	**/
	102	struct lp8860_led {
	103	struct mutex lock;
7a8685ac DM	104	struct i2c_client *client;
	105	struct led_classdev led_dev;
	106	struct regmap *regmap;
	107	struct regmap *eeprom_regmap;
	108	struct gpio_desc *enable_gpio;
	109	struct regulator *regulator;
7a8685ac DM	110	const char *label;
	111	};
	112
	113	struct lp8860_eeprom_reg {
	114	uint8_t reg;
	115	uint8_t value;
	116	};
	117
	118	static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
	119	{ LP8860_EEPROM_REG_0, 0xed },
	120	{ LP8860_EEPROM_REG_1, 0xdf },
	121	{ LP8860_EEPROM_REG_2, 0xdc },
	122	{ LP8860_EEPROM_REG_3, 0xf0 },
	123	{ LP8860_EEPROM_REG_4, 0xdf },
	124	{ LP8860_EEPROM_REG_5, 0xe5 },
	125	{ LP8860_EEPROM_REG_6, 0xf2 },
	126	{ LP8860_EEPROM_REG_7, 0x77 },
	127	{ LP8860_EEPROM_REG_8, 0x77 },
	128	{ LP8860_EEPROM_REG_9, 0x71 },
	129	{ LP8860_EEPROM_REG_10, 0x3f },
	130	{ LP8860_EEPROM_REG_11, 0xb7 },
	131	{ LP8860_EEPROM_REG_12, 0x17 },
	132	{ LP8860_EEPROM_REG_13, 0xef },
	133	{ LP8860_EEPROM_REG_14, 0xb0 },
	134	{ LP8860_EEPROM_REG_15, 0x87 },
	135	{ LP8860_EEPROM_REG_16, 0xce },
	136	{ LP8860_EEPROM_REG_17, 0x72 },
	137	{ LP8860_EEPROM_REG_18, 0xe5 },
	138	{ LP8860_EEPROM_REG_19, 0xdf },
	139	{ LP8860_EEPROM_REG_20, 0x35 },
	140	{ LP8860_EEPROM_REG_21, 0x06 },
	141	{ LP8860_EEPROM_REG_22, 0xdc },
	142	{ LP8860_EEPROM_REG_23, 0x88 },
	143	{ LP8860_EEPROM_REG_24, 0x3E },
	144	};
	145
	146	static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
	147	{
	148	int ret;
	149
	150	mutex_lock(&led->lock);
	151
	152	if (lock == LP8860_UNLOCK_EEPROM) {
	153	ret = regmap_write(led->regmap,
	154	LP8860_EEPROM_UNLOCK,
	155	LP8860_EEPROM_CODE_1);
	156	if (ret) {
	157	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	158	goto out;
	159	}
	160
	161	ret = regmap_write(led->regmap,
	162	LP8860_EEPROM_UNLOCK,
	163	LP8860_EEPROM_CODE_2);
	164	if (ret) {
	165	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	166	goto out;
	167	}
	168	ret = regmap_write(led->regmap,
	169	LP8860_EEPROM_UNLOCK,
	170	LP8860_EEPROM_CODE_3);
	171	if (ret) {
	172	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	173	goto out;
174	}
175	} else {
176	ret = regmap_write(led->regmap,
177	LP8860_EEPROM_UNLOCK,
178	LP8860_LOCK_EEPROM);
179	}
180
181	out:
182	mutex_unlock(&led->lock);
183	return ret;
184	}
185
186	static int lp8860_fault_check(struct lp8860_led *led)
187	{
188	int ret, fault;
189	unsigned int read_buf;
190
191	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
192	if (ret)
193	goto out;
194
195	fault = read_buf;
196
197	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
198	if (ret)
199	goto out;
200
201	fault \|= read_buf;
202
203	/* Attempt to clear any faults */
204	if (fault)
205	ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
206	LP8860_CLEAR_FAULTS);
207	out:
208	return ret;
209	}
210
7c4b10a2 AL	211	static int lp8860_brightness_set(struct led_classdev *led_cdev,
7c4b10a2 AL	212	enum led_brightness brt_val)
7a8685ac	213	{
7c4b10a2 AL	214	struct lp8860_led *led =
	215	container_of(led_cdev, struct lp8860_led, led_dev);
	216	int disp_brightness = brt_val * 255;
7a8685ac	217	int ret;
7a8685ac DM	218
	219	mutex_lock(&led->lock);
	220
	221	ret = lp8860_fault_check(led);
	222	if (ret) {
	223	dev_err(&led->client->dev, "Cannot read/clear faults\n");
	224	goto out;
	225	}
	226
	227	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
	228	(disp_brightness & 0xff00) >> 8);
	229	if (ret) {
	230	dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
	231	goto out;
	232	}
	233
	234	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
	235	disp_brightness & 0xff);
	236	if (ret) {
	237	dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
	238	goto out;
	239	}
	240	out:
	241	mutex_unlock(&led->lock);
7c4b10a2	242	return ret;
7a8685ac DM	243	}
	244
	245	static int lp8860_init(struct lp8860_led *led)
	246	{
	247	unsigned int read_buf;
	248	int ret, i, reg_count;
	249
	250	if (led->enable_gpio)
	251	gpiod_direction_output(led->enable_gpio, 1);
	252
	253	ret = lp8860_fault_check(led);
	254	if (ret)
	255	goto out;
	256
	257	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
	258	if (ret)
	259	goto out;
	260
	261	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
	262	if (ret) {
	263	dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
	264	goto out;
	265	}
	266
	267	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
	268	for (i = 0; i < reg_count; i++) {
	269	ret = regmap_write(led->eeprom_regmap,
	270	lp8860_eeprom_disp_regs[i].reg,
	271	lp8860_eeprom_disp_regs[i].value);
	272	if (ret) {
	273	dev_err(&led->client->dev, "Failed writing EEPROM\n");
	274	goto out;
	275	}
	276	}
	277
	278	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
	279	if (ret)
	280	goto out;
	281
	282	ret = regmap_write(led->regmap,
	283	LP8860_EEPROM_CNTRL,
	284	LP8860_PROGRAM_EEPROM);
	285	if (ret)
	286	dev_err(&led->client->dev, "Failed programming EEPROM\n");
	287	out:
	288	if (ret)
	289	if (led->enable_gpio)
	290	gpiod_direction_output(led->enable_gpio, 0);
	291	return ret;
	292	}
	293
de88e71a	294	static const struct reg_default lp8860_reg_defs[] = {
7a8685ac DM	295	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
	296	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
	297	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
	298	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
	299	{ LP8860_CL2_BRT_MSB, 0x00},
	300	{ LP8860_CL2_BRT_LSB, 0x00},
	301	{ LP8860_CL2_CURRENT, 0x00},
	302	{ LP8860_CL3_BRT_MSB, 0x00},
	303	{ LP8860_CL3_BRT_LSB, 0x00},
	304	{ LP8860_CL3_CURRENT, 0x00},
	305	{ LP8860_CL4_BRT_MSB, 0x00},
	306	{ LP8860_CL4_BRT_LSB, 0x00},
	307	{ LP8860_CL4_CURRENT, 0x00},
	308	{ LP8860_CONFIG, 0x00},
	309	{ LP8860_FAULT_CLEAR, 0x00},
	310	{ LP8860_EEPROM_CNTRL, 0x80},
	311	{ LP8860_EEPROM_UNLOCK, 0x00},
	312	};
	313
	314	static const struct regmap_config lp8860_regmap_config = {
	315	.reg_bits = 8,
	316	.val_bits = 8,
	317
	318	.max_register = LP8860_EEPROM_UNLOCK,
	319	.reg_defaults = lp8860_reg_defs,
	320	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
	321	.cache_type = REGCACHE_NONE,
	322	};
	323
de88e71a	324	static const struct reg_default lp8860_eeprom_defs[] = {
7a8685ac DM	325	{ LP8860_EEPROM_REG_0, 0x00 },
	326	{ LP8860_EEPROM_REG_1, 0x00 },
	327	{ LP8860_EEPROM_REG_2, 0x00 },
	328	{ LP8860_EEPROM_REG_3, 0x00 },
	329	{ LP8860_EEPROM_REG_4, 0x00 },
	330	{ LP8860_EEPROM_REG_5, 0x00 },
	331	{ LP8860_EEPROM_REG_6, 0x00 },
	332	{ LP8860_EEPROM_REG_7, 0x00 },
	333	{ LP8860_EEPROM_REG_8, 0x00 },
	334	{ LP8860_EEPROM_REG_9, 0x00 },
	335	{ LP8860_EEPROM_REG_10, 0x00 },
	336	{ LP8860_EEPROM_REG_11, 0x00 },
	337	{ LP8860_EEPROM_REG_12, 0x00 },
	338	{ LP8860_EEPROM_REG_13, 0x00 },
	339	{ LP8860_EEPROM_REG_14, 0x00 },
	340	{ LP8860_EEPROM_REG_15, 0x00 },
	341	{ LP8860_EEPROM_REG_16, 0x00 },
	342	{ LP8860_EEPROM_REG_17, 0x00 },
	343	{ LP8860_EEPROM_REG_18, 0x00 },
	344	{ LP8860_EEPROM_REG_19, 0x00 },
	345	{ LP8860_EEPROM_REG_20, 0x00 },
	346	{ LP8860_EEPROM_REG_21, 0x00 },
	347	{ LP8860_EEPROM_REG_22, 0x00 },
	348	{ LP8860_EEPROM_REG_23, 0x00 },
	349	{ LP8860_EEPROM_REG_24, 0x00 },
	350	};
	351
	352	static const struct regmap_config lp8860_eeprom_regmap_config = {
	353	.reg_bits = 8,
	354	.val_bits = 8,
	355
	356	.max_register = LP8860_EEPROM_REG_24,
	357	.reg_defaults = lp8860_eeprom_defs,
	358	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
	359	.cache_type = REGCACHE_NONE,
	360	};
	361
	362	static int lp8860_probe(struct i2c_client *client,
	363	const struct i2c_device_id *id)
	364	{
	365	int ret;
	366	struct lp8860_led *led;
	367	struct device_node *np = client->dev.of_node;
	368
	369	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
	370	if (!led)
	371	return -ENOMEM;
	372
	373	led->label = LP8860_DISP_LED_NAME;
	374
	375	if (client->dev.of_node) {
	376	ret = of_property_read_string(np, "label", &led->label);
	377	if (ret) {
	378	dev_err(&client->dev, "Missing label in dt\n");
	379	return -EINVAL;
	380	}
	381	}
	382
eb2294c3 UKK	383	led->enable_gpio = devm_gpiod_get_optional(&client->dev,
	384	"enable", GPIOD_OUT_LOW);
	385	if (IS_ERR(led->enable_gpio)) {
	386	ret = PTR_ERR(led->enable_gpio);
	387	dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
	388	return ret;
	389	}
7a8685ac DM	390
	391	led->regulator = devm_regulator_get(&client->dev, "vled");
	392	if (IS_ERR(led->regulator))
	393	led->regulator = NULL;
	394
	395	led->client = client;
	396	led->led_dev.name = led->label;
	397	led->led_dev.max_brightness = LED_FULL;
7c4b10a2	398	led->led_dev.brightness_set_blocking = lp8860_brightness_set;
7a8685ac DM	399
7a8685ac DM	400	mutex_init(&led->lock);
7a8685ac DM	401
	402	i2c_set_clientdata(client, led);
	403
	404	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
	405	if (IS_ERR(led->regmap)) {
	406	ret = PTR_ERR(led->regmap);
	407	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	408	ret);
	409	return ret;
	410	}
	411
	412	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
	413	if (IS_ERR(led->eeprom_regmap)) {
	414	ret = PTR_ERR(led->eeprom_regmap);
	415	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	416	ret);
	417	return ret;
	418	}
	419
	420	ret = lp8860_init(led);
	421	if (ret)
	422	return ret;
	423
	424	ret = led_classdev_register(&client->dev, &led->led_dev);
	425	if (ret) {
	426	dev_err(&client->dev, "led register err: %d\n", ret);
	427	return ret;
	428	}
	429
	430	return 0;
	431	}
	432
	433	static int lp8860_remove(struct i2c_client *client)
	434	{
	435	struct lp8860_led *led = i2c_get_clientdata(client);
	436	int ret;
	437
	438	led_classdev_unregister(&led->led_dev);
7a8685ac DM	439
	440	if (led->enable_gpio)
	441	gpiod_direction_output(led->enable_gpio, 0);
	442
	443	if (led->regulator) {
	444	ret = regulator_disable(led->regulator);
	445	if (ret)
	446	dev_err(&led->client->dev,
	447	"Failed to disable regulator\n");
	448	}
	449
	450	return 0;
	451	}
	452
	453	static const struct i2c_device_id lp8860_id[] = {
	454	{ "lp8860", 0 },
	455	{ }
	456	};
	457	MODULE_DEVICE_TABLE(i2c, lp8860_id);
	458
	459	#ifdef CONFIG_OF
	460	static const struct of_device_id of_lp8860_leds_match[] = {
	461	{ .compatible = "ti,lp8860", },
	462	{},
	463	};
	464	MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
	465	#endif
	466
	467	static struct i2c_driver lp8860_driver = {
	468	.driver = {
	469	.name = "lp8860",
	470	.of_match_table = of_match_ptr(of_lp8860_leds_match),
	471	},
	472	.probe = lp8860_probe,
	473	.remove = lp8860_remove,
	474	.id_table = lp8860_id,
	475	};
	476	module_i2c_driver(lp8860_driver);
	477
5ee047fb	478	MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
7a8685ac DM	479	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
7a8685ac DM	480	MODULE_LICENSE("GPL");