[mirror_ubuntu-bionic-kernel.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
 * @work - Work item used to off load the brightness register writes
 * @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
 * @brightness - Current brightness value requested
 * @label - LED label
**/
struct lp8860_led {
	struct mutex lock;
	struct work_struct work;
	struct i2c_client *client;
	struct led_classdev led_dev;
	struct regmap *regmap;
	struct regmap *eeprom_regmap;
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	enum led_brightness brightness;
	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 void lp8860_led_brightness_work(struct work_struct *work)
{
	struct lp8860_led *led = container_of(work, struct lp8860_led, work);
	int ret;
	int disp_brightness = led->brightness * 255;

	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);
}

static void 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);

	led->brightness = brt_val;
	schedule_work(&led->work);
}

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 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 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 = lp8860_brightness_set;

	mutex_init(&led->lock);
	INIT_WORK(&led->work, lp8860_led_brightness_work);

	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);
	cancel_work_sync(&led->work);

	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
94	* @work - Work item used to off load the brightness register writes
95	* @client - Pointer to the I2C client
96	* @led_dev - led class device pointer
97	* @regmap - Devices register map
98	* @eeprom_regmap - EEPROM register map
99	* @enable_gpio - VDDIO/EN gpio to enable communication interface
100	* @regulator - LED supply regulator pointer
101	* @brightness - Current brightness value requested
102	* @label - LED label
103	**/
104	struct lp8860_led {
105	struct mutex lock;
106	struct work_struct work;
107	struct i2c_client *client;
108	struct led_classdev led_dev;
109	struct regmap *regmap;
110	struct regmap *eeprom_regmap;
111	struct gpio_desc *enable_gpio;
112	struct regulator *regulator;
113	enum led_brightness brightness;
114	const char *label;
115	};
116
117	struct lp8860_eeprom_reg {
118	uint8_t reg;
119	uint8_t value;
120	};
121
122	static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
123	{ LP8860_EEPROM_REG_0, 0xed },
124	{ LP8860_EEPROM_REG_1, 0xdf },
125	{ LP8860_EEPROM_REG_2, 0xdc },
126	{ LP8860_EEPROM_REG_3, 0xf0 },
127	{ LP8860_EEPROM_REG_4, 0xdf },
128	{ LP8860_EEPROM_REG_5, 0xe5 },
129	{ LP8860_EEPROM_REG_6, 0xf2 },
130	{ LP8860_EEPROM_REG_7, 0x77 },
131	{ LP8860_EEPROM_REG_8, 0x77 },
132	{ LP8860_EEPROM_REG_9, 0x71 },
133	{ LP8860_EEPROM_REG_10, 0x3f },
134	{ LP8860_EEPROM_REG_11, 0xb7 },
135	{ LP8860_EEPROM_REG_12, 0x17 },
136	{ LP8860_EEPROM_REG_13, 0xef },
137	{ LP8860_EEPROM_REG_14, 0xb0 },
138	{ LP8860_EEPROM_REG_15, 0x87 },
139	{ LP8860_EEPROM_REG_16, 0xce },
140	{ LP8860_EEPROM_REG_17, 0x72 },
141	{ LP8860_EEPROM_REG_18, 0xe5 },
142	{ LP8860_EEPROM_REG_19, 0xdf },
143	{ LP8860_EEPROM_REG_20, 0x35 },
144	{ LP8860_EEPROM_REG_21, 0x06 },
145	{ LP8860_EEPROM_REG_22, 0xdc },
146	{ LP8860_EEPROM_REG_23, 0x88 },
147	{ LP8860_EEPROM_REG_24, 0x3E },
148	};
149
150	static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
151	{
152	int ret;
153
154	mutex_lock(&led->lock);
155
156	if (lock == LP8860_UNLOCK_EEPROM) {
157	ret = regmap_write(led->regmap,
158	LP8860_EEPROM_UNLOCK,
159	LP8860_EEPROM_CODE_1);
160	if (ret) {
161	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
162	goto out;
163	}
164
165	ret = regmap_write(led->regmap,
166	LP8860_EEPROM_UNLOCK,
167	LP8860_EEPROM_CODE_2);
168	if (ret) {
169	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
170	goto out;
171	}
172	ret = regmap_write(led->regmap,
173	LP8860_EEPROM_UNLOCK,
174	LP8860_EEPROM_CODE_3);
175	if (ret) {
176	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
177	goto out;
178	}
179	} else {
180	ret = regmap_write(led->regmap,
181	LP8860_EEPROM_UNLOCK,
182	LP8860_LOCK_EEPROM);
183	}
184
185	out:
186	mutex_unlock(&led->lock);
187	return ret;
188	}
189
190	static int lp8860_fault_check(struct lp8860_led *led)
191	{
192	int ret, fault;
193	unsigned int read_buf;
194
195	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
196	if (ret)
197	goto out;
198
199	fault = read_buf;
200
201	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
202	if (ret)
203	goto out;
204
205	fault \|= read_buf;
206
207	/* Attempt to clear any faults */
208	if (fault)
209	ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
210	LP8860_CLEAR_FAULTS);
211	out:
212	return ret;
213	}
214
215	static void lp8860_led_brightness_work(struct work_struct *work)
216	{
217	struct lp8860_led *led = container_of(work, struct lp8860_led, work);
218	int ret;
219	int disp_brightness = led->brightness * 255;
220
221	mutex_lock(&led->lock);
222
223	ret = lp8860_fault_check(led);
224	if (ret) {
225	dev_err(&led->client->dev, "Cannot read/clear faults\n");
226	goto out;
227	}
228
229	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
230	(disp_brightness & 0xff00) >> 8);
231	if (ret) {
232	dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
233	goto out;
234	}
235
236	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
237	disp_brightness & 0xff);
238	if (ret) {
239	dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
240	goto out;
241	}
242	out:
243	mutex_unlock(&led->lock);
244	}
245
246	static void lp8860_brightness_set(struct led_classdev *led_cdev,
247	enum led_brightness brt_val)
248	{
249	struct lp8860_led *led =
250	container_of(led_cdev, struct lp8860_led, led_dev);
251
252	led->brightness = brt_val;
253	schedule_work(&led->work);
254	}
255
256	static int lp8860_init(struct lp8860_led *led)
257	{
258	unsigned int read_buf;
259	int ret, i, reg_count;
260
261	if (led->enable_gpio)
262	gpiod_direction_output(led->enable_gpio, 1);
263
264	ret = lp8860_fault_check(led);
265	if (ret)
266	goto out;
267
268	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
269	if (ret)
270	goto out;
271
272	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
273	if (ret) {
274	dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
275	goto out;
276	}
277
278	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
279	for (i = 0; i < reg_count; i++) {
280	ret = regmap_write(led->eeprom_regmap,
281	lp8860_eeprom_disp_regs[i].reg,
282	lp8860_eeprom_disp_regs[i].value);
283	if (ret) {
284	dev_err(&led->client->dev, "Failed writing EEPROM\n");
285	goto out;
286	}
287	}
288
289	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
290	if (ret)
291	goto out;
292
293	ret = regmap_write(led->regmap,
294	LP8860_EEPROM_CNTRL,
295	LP8860_PROGRAM_EEPROM);
296	if (ret)
297	dev_err(&led->client->dev, "Failed programming EEPROM\n");
298	out:
299	if (ret)
300	if (led->enable_gpio)
301	gpiod_direction_output(led->enable_gpio, 0);
302	return ret;
303	}
304
305	static struct reg_default lp8860_reg_defs[] = {
306	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
307	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
308	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
309	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
310	{ LP8860_CL2_BRT_MSB, 0x00},
311	{ LP8860_CL2_BRT_LSB, 0x00},
312	{ LP8860_CL2_CURRENT, 0x00},
313	{ LP8860_CL3_BRT_MSB, 0x00},
314	{ LP8860_CL3_BRT_LSB, 0x00},
315	{ LP8860_CL3_CURRENT, 0x00},
316	{ LP8860_CL4_BRT_MSB, 0x00},
317	{ LP8860_CL4_BRT_LSB, 0x00},
318	{ LP8860_CL4_CURRENT, 0x00},
319	{ LP8860_CONFIG, 0x00},
320	{ LP8860_FAULT_CLEAR, 0x00},
321	{ LP8860_EEPROM_CNTRL, 0x80},
322	{ LP8860_EEPROM_UNLOCK, 0x00},
323	};
324
325	static const struct regmap_config lp8860_regmap_config = {
326	.reg_bits = 8,
327	.val_bits = 8,
328
329	.max_register = LP8860_EEPROM_UNLOCK,
330	.reg_defaults = lp8860_reg_defs,
331	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
332	.cache_type = REGCACHE_NONE,
333	};
334
335	static struct reg_default lp8860_eeprom_defs[] = {
336	{ LP8860_EEPROM_REG_0, 0x00 },
337	{ LP8860_EEPROM_REG_1, 0x00 },
338	{ LP8860_EEPROM_REG_2, 0x00 },
339	{ LP8860_EEPROM_REG_3, 0x00 },
340	{ LP8860_EEPROM_REG_4, 0x00 },
341	{ LP8860_EEPROM_REG_5, 0x00 },
342	{ LP8860_EEPROM_REG_6, 0x00 },
343	{ LP8860_EEPROM_REG_7, 0x00 },
344	{ LP8860_EEPROM_REG_8, 0x00 },
345	{ LP8860_EEPROM_REG_9, 0x00 },
346	{ LP8860_EEPROM_REG_10, 0x00 },
347	{ LP8860_EEPROM_REG_11, 0x00 },
348	{ LP8860_EEPROM_REG_12, 0x00 },
349	{ LP8860_EEPROM_REG_13, 0x00 },
350	{ LP8860_EEPROM_REG_14, 0x00 },
351	{ LP8860_EEPROM_REG_15, 0x00 },
352	{ LP8860_EEPROM_REG_16, 0x00 },
353	{ LP8860_EEPROM_REG_17, 0x00 },
354	{ LP8860_EEPROM_REG_18, 0x00 },
355	{ LP8860_EEPROM_REG_19, 0x00 },
356	{ LP8860_EEPROM_REG_20, 0x00 },
357	{ LP8860_EEPROM_REG_21, 0x00 },
358	{ LP8860_EEPROM_REG_22, 0x00 },
359	{ LP8860_EEPROM_REG_23, 0x00 },
360	{ LP8860_EEPROM_REG_24, 0x00 },
361	};
362
363	static const struct regmap_config lp8860_eeprom_regmap_config = {
364	.reg_bits = 8,
365	.val_bits = 8,
366
367	.max_register = LP8860_EEPROM_REG_24,
368	.reg_defaults = lp8860_eeprom_defs,
369	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
370	.cache_type = REGCACHE_NONE,
371	};
372
373	static int lp8860_probe(struct i2c_client *client,
374	const struct i2c_device_id *id)
375	{
376	int ret;
377	struct lp8860_led *led;
378	struct device_node *np = client->dev.of_node;
379
380	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
381	if (!led)
382	return -ENOMEM;
383
384	led->label = LP8860_DISP_LED_NAME;
385
386	if (client->dev.of_node) {
387	ret = of_property_read_string(np, "label", &led->label);
388	if (ret) {
389	dev_err(&client->dev, "Missing label in dt\n");
390	return -EINVAL;
391	}
392	}
393
eb2294c3 UKK	394	led->enable_gpio = devm_gpiod_get_optional(&client->dev,
	395	"enable", GPIOD_OUT_LOW);
	396	if (IS_ERR(led->enable_gpio)) {
	397	ret = PTR_ERR(led->enable_gpio);
	398	dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
	399	return ret;
	400	}
7a8685ac DM	401
	402	led->regulator = devm_regulator_get(&client->dev, "vled");
	403	if (IS_ERR(led->regulator))
	404	led->regulator = NULL;
	405
	406	led->client = client;
	407	led->led_dev.name = led->label;
	408	led->led_dev.max_brightness = LED_FULL;
	409	led->led_dev.brightness_set = lp8860_brightness_set;
	410
	411	mutex_init(&led->lock);
	412	INIT_WORK(&led->work, lp8860_led_brightness_work);
	413
	414	i2c_set_clientdata(client, led);
	415
	416	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
	417	if (IS_ERR(led->regmap)) {
	418	ret = PTR_ERR(led->regmap);
	419	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	420	ret);
	421	return ret;
	422	}
	423
	424	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
	425	if (IS_ERR(led->eeprom_regmap)) {
	426	ret = PTR_ERR(led->eeprom_regmap);
	427	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	428	ret);
	429	return ret;
	430	}
	431
	432	ret = lp8860_init(led);
	433	if (ret)
	434	return ret;
	435
	436	ret = led_classdev_register(&client->dev, &led->led_dev);
	437	if (ret) {
	438	dev_err(&client->dev, "led register err: %d\n", ret);
	439	return ret;
	440	}
	441
	442	return 0;
	443	}
	444
	445	static int lp8860_remove(struct i2c_client *client)
	446	{
	447	struct lp8860_led *led = i2c_get_clientdata(client);
	448	int ret;
	449
	450	led_classdev_unregister(&led->led_dev);
	451	cancel_work_sync(&led->work);
	452
	453	if (led->enable_gpio)
	454	gpiod_direction_output(led->enable_gpio, 0);
	455
	456	if (led->regulator) {
	457	ret = regulator_disable(led->regulator);
	458	if (ret)
	459	dev_err(&led->client->dev,
	460	"Failed to disable regulator\n");
	461	}
	462
	463	return 0;
	464	}
465
466	static const struct i2c_device_id lp8860_id[] = {
467	{ "lp8860", 0 },
468	{ }
469	};
470	MODULE_DEVICE_TABLE(i2c, lp8860_id);
471
472	#ifdef CONFIG_OF
473	static const struct of_device_id of_lp8860_leds_match[] = {
474	{ .compatible = "ti,lp8860", },
475	{},
476	};
477	MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
478	#endif
479
480	static struct i2c_driver lp8860_driver = {
481	.driver = {
482	.name = "lp8860",
483	.of_match_table = of_match_ptr(of_lp8860_leds_match),
484	},
485	.probe = lp8860_probe,
486	.remove = lp8860_remove,
487	.id_table = lp8860_id,
488	};
489	module_i2c_driver(lp8860_driver);
490
5ee047fb	491	MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");
7a8685ac DM	492	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
7a8685ac DM	493	MODULE_LICENSE("GPL");