[linux-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>

#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_NAME			"lp8860"

/**
 * 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
 */
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;
};

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 = dev_of_node(&client->dev);
	struct device_node *child_node;
	struct led_init_data init_data = {};

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

	child_node = of_get_next_available_child(np, NULL);
	if (!child_node)
		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.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;

	init_data.fwnode = of_fwnode_handle(child_node);
	init_data.devicename = LP8860_NAME;
	init_data.default_label = ":display_cluster";

	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,
					     &init_data);
	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>
	21
	22	#define LP8860_DISP_CL1_BRT_MSB 0x00
	23	#define LP8860_DISP_CL1_BRT_LSB 0x01
	24	#define LP8860_DISP_CL1_CURR_MSB 0x02
	25	#define LP8860_DISP_CL1_CURR_LSB 0x03
	26	#define LP8860_CL2_BRT_MSB 0x04
	27	#define LP8860_CL2_BRT_LSB 0x05
	28	#define LP8860_CL2_CURRENT 0x06
	29	#define LP8860_CL3_BRT_MSB 0x07
	30	#define LP8860_CL3_BRT_LSB 0x08
	31	#define LP8860_CL3_CURRENT 0x09
	32	#define LP8860_CL4_BRT_MSB 0x0a
	33	#define LP8860_CL4_BRT_LSB 0x0b
	34	#define LP8860_CL4_CURRENT 0x0c
	35	#define LP8860_CONFIG 0x0d
	36	#define LP8860_STATUS 0x0e
	37	#define LP8860_FAULT 0x0f
	38	#define LP8860_LED_FAULT 0x10
	39	#define LP8860_FAULT_CLEAR 0x11
	40	#define LP8860_ID 0x12
	41	#define LP8860_TEMP_MSB 0x13
	42	#define LP8860_TEMP_LSB 0x14
	43	#define LP8860_DISP_LED_CURR_MSB 0x15
	44	#define LP8860_DISP_LED_CURR_LSB 0x16
	45	#define LP8860_DISP_LED_PWM_MSB 0x17
	46	#define LP8860_DISP_LED_PWM_LSB 0x18
	47	#define LP8860_EEPROM_CNTRL 0x19
	48	#define LP8860_EEPROM_UNLOCK 0x1a
	49
	50	#define LP8860_EEPROM_REG_0 0x60
	51	#define LP8860_EEPROM_REG_1 0x61
	52	#define LP8860_EEPROM_REG_2 0x62
	53	#define LP8860_EEPROM_REG_3 0x63
	54	#define LP8860_EEPROM_REG_4 0x64
	55	#define LP8860_EEPROM_REG_5 0x65
	56	#define LP8860_EEPROM_REG_6 0x66
	57	#define LP8860_EEPROM_REG_7 0x67
	58	#define LP8860_EEPROM_REG_8 0x68
	59	#define LP8860_EEPROM_REG_9 0x69
	60	#define LP8860_EEPROM_REG_10 0x6a
	61	#define LP8860_EEPROM_REG_11 0x6b
	62	#define LP8860_EEPROM_REG_12 0x6c
	63	#define LP8860_EEPROM_REG_13 0x6d
	64	#define LP8860_EEPROM_REG_14 0x6e
	65	#define LP8860_EEPROM_REG_15 0x6f
	66	#define LP8860_EEPROM_REG_16 0x70
	67	#define LP8860_EEPROM_REG_17 0x71
	68	#define LP8860_EEPROM_REG_18 0x72
	69	#define LP8860_EEPROM_REG_19 0x73
	70	#define LP8860_EEPROM_REG_20 0x74
	71	#define LP8860_EEPROM_REG_21 0x75
72	#define LP8860_EEPROM_REG_22 0x76
73	#define LP8860_EEPROM_REG_23 0x77
74	#define LP8860_EEPROM_REG_24 0x78
75
76	#define LP8860_LOCK_EEPROM 0x00
77	#define LP8860_UNLOCK_EEPROM 0x01
78	#define LP8860_PROGRAM_EEPROM 0x02
79	#define LP8860_EEPROM_CODE_1 0x08
80	#define LP8860_EEPROM_CODE_2 0xba
81	#define LP8860_EEPROM_CODE_3 0xef
82
83	#define LP8860_CLEAR_FAULTS 0x01
84
99ca0ea5 JA	85	#define LP8860_NAME "lp8860"
99ca0ea5 JA	86
7a8685ac	87	/**
46cc5941 LJ	88	* struct lp8860_led
	89	* @lock: Lock for reading/writing the device
	90	* @client: Pointer to the I2C client
	91	* @led_dev: led class device pointer
	92	* @regmap: Devices register map
	93	* @eeprom_regmap: EEPROM register map
	94	* @enable_gpio: VDDIO/EN gpio to enable communication interface
	95	* @regulator: LED supply regulator pointer
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;
7a8685ac DM	105	};
	106
	107	struct lp8860_eeprom_reg {
	108	uint8_t reg;
	109	uint8_t value;
	110	};
	111
	112	static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = {
	113	{ LP8860_EEPROM_REG_0, 0xed },
	114	{ LP8860_EEPROM_REG_1, 0xdf },
	115	{ LP8860_EEPROM_REG_2, 0xdc },
	116	{ LP8860_EEPROM_REG_3, 0xf0 },
	117	{ LP8860_EEPROM_REG_4, 0xdf },
	118	{ LP8860_EEPROM_REG_5, 0xe5 },
	119	{ LP8860_EEPROM_REG_6, 0xf2 },
	120	{ LP8860_EEPROM_REG_7, 0x77 },
	121	{ LP8860_EEPROM_REG_8, 0x77 },
	122	{ LP8860_EEPROM_REG_9, 0x71 },
	123	{ LP8860_EEPROM_REG_10, 0x3f },
	124	{ LP8860_EEPROM_REG_11, 0xb7 },
	125	{ LP8860_EEPROM_REG_12, 0x17 },
	126	{ LP8860_EEPROM_REG_13, 0xef },
	127	{ LP8860_EEPROM_REG_14, 0xb0 },
	128	{ LP8860_EEPROM_REG_15, 0x87 },
	129	{ LP8860_EEPROM_REG_16, 0xce },
	130	{ LP8860_EEPROM_REG_17, 0x72 },
	131	{ LP8860_EEPROM_REG_18, 0xe5 },
	132	{ LP8860_EEPROM_REG_19, 0xdf },
	133	{ LP8860_EEPROM_REG_20, 0x35 },
	134	{ LP8860_EEPROM_REG_21, 0x06 },
	135	{ LP8860_EEPROM_REG_22, 0xdc },
	136	{ LP8860_EEPROM_REG_23, 0x88 },
	137	{ LP8860_EEPROM_REG_24, 0x3E },
	138	};
	139
	140	static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)
	141	{
	142	int ret;
	143
	144	mutex_lock(&led->lock);
	145
	146	if (lock == LP8860_UNLOCK_EEPROM) {
	147	ret = regmap_write(led->regmap,
	148	LP8860_EEPROM_UNLOCK,
	149	LP8860_EEPROM_CODE_1);
	150	if (ret) {
	151	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	152	goto out;
	153	}
	154
	155	ret = regmap_write(led->regmap,
	156	LP8860_EEPROM_UNLOCK,
	157	LP8860_EEPROM_CODE_2);
	158	if (ret) {
	159	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	160	goto out;
	161	}
	162	ret = regmap_write(led->regmap,
	163	LP8860_EEPROM_UNLOCK,
	164	LP8860_EEPROM_CODE_3);
	165	if (ret) {
	166	dev_err(&led->client->dev, "EEPROM Unlock failed\n");
	167	goto out;
	168	}
169	} else {
170	ret = regmap_write(led->regmap,
171	LP8860_EEPROM_UNLOCK,
172	LP8860_LOCK_EEPROM);
173	}
174
175	out:
176	mutex_unlock(&led->lock);
177	return ret;
178	}
179
180	static int lp8860_fault_check(struct lp8860_led *led)
181	{
182	int ret, fault;
183	unsigned int read_buf;
184
185	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);
186	if (ret)
187	goto out;
188
189	fault = read_buf;
190
191	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);
192	if (ret)
193	goto out;
194
195	fault \|= read_buf;
196
197	/* Attempt to clear any faults */
198	if (fault)
199	ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,
200	LP8860_CLEAR_FAULTS);
201	out:
202	return ret;
203	}
204
7c4b10a2 AL	205	static int lp8860_brightness_set(struct led_classdev *led_cdev,
7c4b10a2 AL	206	enum led_brightness brt_val)
7a8685ac	207	{
7c4b10a2 AL	208	struct lp8860_led *led =
	209	container_of(led_cdev, struct lp8860_led, led_dev);
	210	int disp_brightness = brt_val * 255;
7a8685ac	211	int ret;
7a8685ac DM	212
	213	mutex_lock(&led->lock);
	214
	215	ret = lp8860_fault_check(led);
	216	if (ret) {
	217	dev_err(&led->client->dev, "Cannot read/clear faults\n");
	218	goto out;
	219	}
	220
	221	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,
	222	(disp_brightness & 0xff00) >> 8);
	223	if (ret) {
	224	dev_err(&led->client->dev, "Cannot write CL1 MSB\n");
	225	goto out;
	226	}
	227
	228	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,
	229	disp_brightness & 0xff);
	230	if (ret) {
	231	dev_err(&led->client->dev, "Cannot write CL1 LSB\n");
	232	goto out;
	233	}
	234	out:
	235	mutex_unlock(&led->lock);
7c4b10a2	236	return ret;
7a8685ac DM	237	}
	238
	239	static int lp8860_init(struct lp8860_led *led)
	240	{
	241	unsigned int read_buf;
	242	int ret, i, reg_count;
	243
b12ef03a DM	244	if (led->regulator) {
	245	ret = regulator_enable(led->regulator);
	246	if (ret) {
	247	dev_err(&led->client->dev,
	248	"Failed to enable regulator\n");
	249	return ret;
	250	}
	251	}
	252
7a8685ac DM	253	if (led->enable_gpio)
	254	gpiod_direction_output(led->enable_gpio, 1);
	255
	256	ret = lp8860_fault_check(led);
	257	if (ret)
	258	goto out;
	259
	260	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);
	261	if (ret)
	262	goto out;
	263
	264	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);
	265	if (ret) {
	266	dev_err(&led->client->dev, "Failed unlocking EEPROM\n");
	267	goto out;
	268	}
	269
	270	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);
	271	for (i = 0; i < reg_count; i++) {
	272	ret = regmap_write(led->eeprom_regmap,
	273	lp8860_eeprom_disp_regs[i].reg,
	274	lp8860_eeprom_disp_regs[i].value);
	275	if (ret) {
	276	dev_err(&led->client->dev, "Failed writing EEPROM\n");
	277	goto out;
	278	}
	279	}
	280
	281	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);
	282	if (ret)
	283	goto out;
	284
	285	ret = regmap_write(led->regmap,
	286	LP8860_EEPROM_CNTRL,
	287	LP8860_PROGRAM_EEPROM);
b12ef03a	288	if (ret) {
7a8685ac	289	dev_err(&led->client->dev, "Failed programming EEPROM\n");
b12ef03a DM	290	goto out;
	291	}
	292
	293	return ret;
	294
7a8685ac DM	295	out:
	296	if (ret)
	297	if (led->enable_gpio)
	298	gpiod_direction_output(led->enable_gpio, 0);
b12ef03a DM	299
	300	if (led->regulator) {
	301	ret = regulator_disable(led->regulator);
	302	if (ret)
	303	dev_err(&led->client->dev,
	304	"Failed to disable regulator\n");
	305	}
	306
7a8685ac DM	307	return ret;
	308	}
	309
de88e71a	310	static const struct reg_default lp8860_reg_defs[] = {
7a8685ac DM	311	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
	312	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
	313	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
	314	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
	315	{ LP8860_CL2_BRT_MSB, 0x00},
	316	{ LP8860_CL2_BRT_LSB, 0x00},
	317	{ LP8860_CL2_CURRENT, 0x00},
	318	{ LP8860_CL3_BRT_MSB, 0x00},
	319	{ LP8860_CL3_BRT_LSB, 0x00},
	320	{ LP8860_CL3_CURRENT, 0x00},
	321	{ LP8860_CL4_BRT_MSB, 0x00},
	322	{ LP8860_CL4_BRT_LSB, 0x00},
	323	{ LP8860_CL4_CURRENT, 0x00},
	324	{ LP8860_CONFIG, 0x00},
	325	{ LP8860_FAULT_CLEAR, 0x00},
	326	{ LP8860_EEPROM_CNTRL, 0x80},
	327	{ LP8860_EEPROM_UNLOCK, 0x00},
	328	};
	329
	330	static const struct regmap_config lp8860_regmap_config = {
	331	.reg_bits = 8,
	332	.val_bits = 8,
	333
	334	.max_register = LP8860_EEPROM_UNLOCK,
	335	.reg_defaults = lp8860_reg_defs,
	336	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
	337	.cache_type = REGCACHE_NONE,
	338	};
	339
de88e71a	340	static const struct reg_default lp8860_eeprom_defs[] = {
7a8685ac DM	341	{ LP8860_EEPROM_REG_0, 0x00 },
	342	{ LP8860_EEPROM_REG_1, 0x00 },
	343	{ LP8860_EEPROM_REG_2, 0x00 },
	344	{ LP8860_EEPROM_REG_3, 0x00 },
	345	{ LP8860_EEPROM_REG_4, 0x00 },
	346	{ LP8860_EEPROM_REG_5, 0x00 },
	347	{ LP8860_EEPROM_REG_6, 0x00 },
	348	{ LP8860_EEPROM_REG_7, 0x00 },
	349	{ LP8860_EEPROM_REG_8, 0x00 },
	350	{ LP8860_EEPROM_REG_9, 0x00 },
	351	{ LP8860_EEPROM_REG_10, 0x00 },
	352	{ LP8860_EEPROM_REG_11, 0x00 },
	353	{ LP8860_EEPROM_REG_12, 0x00 },
	354	{ LP8860_EEPROM_REG_13, 0x00 },
	355	{ LP8860_EEPROM_REG_14, 0x00 },
	356	{ LP8860_EEPROM_REG_15, 0x00 },
	357	{ LP8860_EEPROM_REG_16, 0x00 },
	358	{ LP8860_EEPROM_REG_17, 0x00 },
	359	{ LP8860_EEPROM_REG_18, 0x00 },
	360	{ LP8860_EEPROM_REG_19, 0x00 },
	361	{ LP8860_EEPROM_REG_20, 0x00 },
	362	{ LP8860_EEPROM_REG_21, 0x00 },
	363	{ LP8860_EEPROM_REG_22, 0x00 },
	364	{ LP8860_EEPROM_REG_23, 0x00 },
	365	{ LP8860_EEPROM_REG_24, 0x00 },
	366	};
	367
	368	static const struct regmap_config lp8860_eeprom_regmap_config = {
	369	.reg_bits = 8,
	370	.val_bits = 8,
	371
	372	.max_register = LP8860_EEPROM_REG_24,
	373	.reg_defaults = lp8860_eeprom_defs,
	374	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
	375	.cache_type = REGCACHE_NONE,
	376	};
	377
	378	static int lp8860_probe(struct i2c_client *client,
	379	const struct i2c_device_id *id)
	380	{
	381	int ret;
	382	struct lp8860_led *led;
8853c95e	383	struct device_node *np = dev_of_node(&client->dev);
c6b218c9	384	struct device_node *child_node;
99ca0ea5	385	struct led_init_data init_data = {};
7a8685ac DM	386
	387	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
	388	if (!led)
	389	return -ENOMEM;
	390
99ca0ea5 JA	391	child_node = of_get_next_available_child(np, NULL);
	392	if (!child_node)
	393	return -EINVAL;
	394
eb2294c3 UKK	395	led->enable_gpio = devm_gpiod_get_optional(&client->dev,
	396	"enable", GPIOD_OUT_LOW);
	397	if (IS_ERR(led->enable_gpio)) {
	398	ret = PTR_ERR(led->enable_gpio);
	399	dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
	400	return ret;
	401	}
7a8685ac DM	402
	403	led->regulator = devm_regulator_get(&client->dev, "vled");
	404	if (IS_ERR(led->regulator))
	405	led->regulator = NULL;
	406
	407	led->client = client;
7c4b10a2	408	led->led_dev.brightness_set_blocking = lp8860_brightness_set;
7a8685ac DM	409
7a8685ac DM	410	mutex_init(&led->lock);
7a8685ac DM	411
	412	i2c_set_clientdata(client, led);
	413
	414	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
	415	if (IS_ERR(led->regmap)) {
	416	ret = PTR_ERR(led->regmap);
	417	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	418	ret);
	419	return ret;
	420	}
	421
	422	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);
	423	if (IS_ERR(led->eeprom_regmap)) {
	424	ret = PTR_ERR(led->eeprom_regmap);
	425	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	426	ret);
	427	return ret;
	428	}
	429
	430	ret = lp8860_init(led);
	431	if (ret)
	432	return ret;
	433
99ca0ea5 JA	434	init_data.fwnode = of_fwnode_handle(child_node);
	435	init_data.devicename = LP8860_NAME;
	436	init_data.default_label = ":display_cluster";
	437
	438	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,
	439	&init_data);
7a8685ac DM	440	if (ret) {
	441	dev_err(&client->dev, "led register err: %d\n", ret);
	442	return ret;
	443	}
	444
	445	return 0;
	446	}
	447
	448	static int lp8860_remove(struct i2c_client *client)
	449	{
	450	struct lp8860_led *led = i2c_get_clientdata(client);
	451	int ret;
	452
7a8685ac DM	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
a2169c9b DM	463	mutex_destroy(&led->lock);
a2169c9b DM	464
7a8685ac DM	465	return 0;
	466	}
	467
	468	static const struct i2c_device_id lp8860_id[] = {
	469	{ "lp8860", 0 },
	470	{ }
	471	};
	472	MODULE_DEVICE_TABLE(i2c, lp8860_id);
	473
7a8685ac DM	474	static const struct of_device_id of_lp8860_leds_match[] = {
	475	{ .compatible = "ti,lp8860", },
	476	{},
	477	};
	478	MODULE_DEVICE_TABLE(of, of_lp8860_leds_match);
7a8685ac DM	479
	480	static struct i2c_driver lp8860_driver = {
	481	.driver = {
	482	.name = "lp8860",
a2169c9b	483	.of_match_table = of_lp8860_leds_match,
7a8685ac DM	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	492	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
a2169c9b	493	MODULE_LICENSE("GPL v2");