drivers/leds/leds-lp8501.c - linux-mtk - Git at Google

 /*
  * TI LP8501 9 channel LED Driver
  *
  * Copyright (C) 2013 Texas Instruments
  *
  * Author: Milo(Woogyom) Kim <milo.kim@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/delay.h>
 #include <linux/firmware.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_data/leds-lp55xx.h>
 #include <linux/slab.h>

 #include "leds-lp55xx-common.h"

 #define LP8501_PROGRAM_LENGTH		32
 #define LP8501_MAX_LEDS			9

 /* Registers */
 #define LP8501_REG_ENABLE		0x00
 #define LP8501_ENABLE			BIT(6)
 #define LP8501_EXEC_M			0x3F
 #define LP8501_EXEC_ENG1_M		0x30
 #define LP8501_EXEC_ENG2_M		0x0C
 #define LP8501_EXEC_ENG3_M		0x03
 #define LP8501_RUN_ENG1			0x20
 #define LP8501_RUN_ENG2			0x08
 #define LP8501_RUN_ENG3			0x02

 #define LP8501_REG_OP_MODE		0x01
 #define LP8501_MODE_ENG1_M		0x30
 #define LP8501_MODE_ENG2_M		0x0C
 #define LP8501_MODE_ENG3_M		0x03
 #define LP8501_LOAD_ENG1		0x10
 #define LP8501_LOAD_ENG2		0x04
 #define LP8501_LOAD_ENG3		0x01

 #define LP8501_REG_PWR_CONFIG		0x05
 #define LP8501_PWR_CONFIG_M		0x03

 #define LP8501_REG_LED_PWM_BASE		0x16

 #define LP8501_REG_LED_CURRENT_BASE	0x26

 #define LP8501_REG_CONFIG		0x36
 #define LP8501_PWM_PSAVE		BIT(7)
 #define LP8501_AUTO_INC			BIT(6)
 #define LP8501_PWR_SAVE			BIT(5)
 #define LP8501_CP_AUTO			0x18
 #define LP8501_INT_CLK			BIT(0)
 #define LP8501_DEFAULT_CFG	\
 	(LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE | LP8501_CP_AUTO)

 #define LP8501_REG_RESET		0x3D
 #define LP8501_RESET			0xFF

 #define LP8501_REG_PROG_PAGE_SEL	0x4F
 #define LP8501_PAGE_ENG1		0
 #define LP8501_PAGE_ENG2		1
 #define LP8501_PAGE_ENG3		2

 #define LP8501_REG_PROG_MEM		0x50

 #define LP8501_ENG1_IS_LOADING(mode)	\
 	((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
 #define LP8501_ENG2_IS_LOADING(mode)	\
 	((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
 #define LP8501_ENG3_IS_LOADING(mode)	\
 	((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)

 static inline void lp8501_wait_opmode_done(void)
 {
 	usleep_range(1000, 2000);
 }

 static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
 {
 	led->led_current = led_current;
 	lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
 		led_current);
 }

 static int lp8501_post_init_device(struct lp55xx_chip *chip)
 {
 	int ret;
 	u8 val = LP8501_DEFAULT_CFG;

 	ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
 	if (ret)
 		return ret;

 	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 	usleep_range(1000, 2000);

 	if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
 		val |= LP8501_INT_CLK;

 	ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
 	if (ret)
 		return ret;

 	/* Power selection for each output */
 	return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
 				LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
 }

 static void lp8501_load_engine(struct lp55xx_chip *chip)
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
 	static const u8 mask[] = {
 		[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
 		[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
 		[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
 	};

 	static const u8 val[] = {
 		[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
 		[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
 		[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
 	};

 	static const u8 page_sel[] = {
 		[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
 		[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
 		[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
 	};

 	lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);

 	lp8501_wait_opmode_done();

 	lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
 }

 static void lp8501_stop_engine(struct lp55xx_chip *chip)
 {
 	lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
 	lp8501_wait_opmode_done();
 }

 static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
 {
 	int i;

 	for (i = 0; i < LP8501_MAX_LEDS; i++)
 		lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
 }

 static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
 {
 	int ret;
 	u8 mode;
 	u8 exec;

 	/* stop engine */
 	if (!start) {
 		lp8501_stop_engine(chip);
 		lp8501_turn_off_channels(chip);
 		return;
 	}

 	/*
 	 * To run the engine,
 	 * operation mode and enable register should updated at the same time
 	 */

 	ret = lp55xx_read(chip, LP8501_REG_OP_MODE, &mode);
 	if (ret)
 		return;

 	ret = lp55xx_read(chip, LP8501_REG_ENABLE, &exec);
 	if (ret)
 		return;

 	/* change operation mode to RUN only when each engine is loading */
 	if (LP8501_ENG1_IS_LOADING(mode)) {
 		mode = (mode & ~LP8501_MODE_ENG1_M) | LP8501_RUN_ENG1;
 		exec = (exec & ~LP8501_EXEC_ENG1_M) | LP8501_RUN_ENG1;
 	}

 	if (LP8501_ENG2_IS_LOADING(mode)) {
 		mode = (mode & ~LP8501_MODE_ENG2_M) | LP8501_RUN_ENG2;
 		exec = (exec & ~LP8501_EXEC_ENG2_M) | LP8501_RUN_ENG2;
 	}

 	if (LP8501_ENG3_IS_LOADING(mode)) {
 		mode = (mode & ~LP8501_MODE_ENG3_M) | LP8501_RUN_ENG3;
 		exec = (exec & ~LP8501_EXEC_ENG3_M) | LP8501_RUN_ENG3;
 	}

 	lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
 	lp8501_wait_opmode_done();

 	lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
 }

 static int lp8501_update_program_memory(struct lp55xx_chip *chip,
 					const u8 *data, size_t size)
 {
 	u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
 	unsigned cmd;
 	char c[3];
 	int update_size;
 	int nrchars;
 	int offset = 0;
 	int ret;
 	int i;

 	/* clear program memory before updating */
 	for (i = 0; i < LP8501_PROGRAM_LENGTH; i++)
 		lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);

 	i = 0;
 	while ((offset < size - 1) && (i < LP8501_PROGRAM_LENGTH)) {
 		/* separate sscanfs because length is working only for %s */
 		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 		if (ret != 1)
 			goto err;

 		ret = sscanf(c, "%2x", &cmd);
 		if (ret != 1)
 			goto err;

 		pattern[i] = (u8)cmd;
 		offset += nrchars;
 		i++;
 	}

 	/* Each instruction is 16bit long. Check that length is even */
 	if (i % 2)
 		goto err;

 	update_size = i;
 	for (i = 0; i < update_size; i++)
 		lp55xx_write(chip, LP8501_REG_PROG_MEM + i, pattern[i]);

 	return 0;

 err:
 	dev_err(&chip->cl->dev, "wrong pattern format\n");
 	return -EINVAL;
 }

 static void lp8501_firmware_loaded(struct lp55xx_chip *chip)
 {
 	const struct firmware *fw = chip->fw;

 	if (fw->size > LP8501_PROGRAM_LENGTH) {
 		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 			fw->size);
 		return;
 	}

 	/*
 	 * Program memory sequence
 	 *  1) set engine mode to "LOAD"
 	 *  2) write firmware data into program memory
 	 */

 	lp8501_load_engine(chip);
 	lp8501_update_program_memory(chip, fw->data, fw->size);
 }

 static int lp8501_led_brightness(struct lp55xx_led *led)
 {
 	struct lp55xx_chip *chip = led->chip;
 	int ret;

 	mutex_lock(&chip->lock);
 	ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
 		     led->brightness);
 	mutex_unlock(&chip->lock);

 	return ret;
 }

 /* Chip specific configurations */
 static struct lp55xx_device_config lp8501_cfg = {
 	.reset = {
 		.addr = LP8501_REG_RESET,
 		.val  = LP8501_RESET,
 	},
 	.enable = {
 		.addr = LP8501_REG_ENABLE,
 		.val  = LP8501_ENABLE,
 	},
 	.max_channel  = LP8501_MAX_LEDS,
 	.post_init_device   = lp8501_post_init_device,
 	.brightness_fn      = lp8501_led_brightness,
 	.set_led_current    = lp8501_set_led_current,
 	.firmware_cb        = lp8501_firmware_loaded,
 	.run_engine         = lp8501_run_engine,
 };

 static int lp8501_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int ret;
 	struct lp55xx_chip *chip;
 	struct lp55xx_led *led;
 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device_node *np = client->dev.of_node;

 	if (!pdata) {
 		if (np) {
 			pdata = lp55xx_of_populate_pdata(&client->dev, np);
 			if (IS_ERR(pdata))
 				return PTR_ERR(pdata);
 		} else {
 			dev_err(&client->dev, "no platform data\n");
 			return -EINVAL;
 		}
 	}

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

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

 	chip->cl = client;
 	chip->pdata = pdata;
 	chip->cfg = &lp8501_cfg;

 	mutex_init(&chip->lock);

 	i2c_set_clientdata(client, led);

 	ret = lp55xx_init_device(chip);
 	if (ret)
 		goto err_init;

 	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);

 	ret = lp55xx_register_leds(led, chip);
 	if (ret)
 		goto err_register_leds;

 	ret = lp55xx_register_sysfs(chip);
 	if (ret) {
 		dev_err(&client->dev, "registering sysfs failed\n");
 		goto err_register_sysfs;
 	}

 	return 0;

 err_register_sysfs:
 	lp55xx_unregister_leds(led, chip);
 err_register_leds:
 	lp55xx_deinit_device(chip);
 err_init:
 	return ret;
 }

 static int lp8501_remove(struct i2c_client *client)
 {
 	struct lp55xx_led *led = i2c_get_clientdata(client);
 	struct lp55xx_chip *chip = led->chip;

 	lp8501_stop_engine(chip);
 	lp55xx_unregister_sysfs(chip);
 	lp55xx_unregister_leds(led, chip);
 	lp55xx_deinit_device(chip);

 	return 0;
 }

 static const struct i2c_device_id lp8501_id[] = {
 	{ "lp8501",  0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, lp8501_id);

 #ifdef CONFIG_OF
 static const struct of_device_id of_lp8501_leds_match[] = {
 	{ .compatible = "ti,lp8501", },
 	{},
 };

 MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
 #endif

 static struct i2c_driver lp8501_driver = {
 	.driver = {
 		.name	= "lp8501",
 		.of_match_table = of_match_ptr(of_lp8501_leds_match),
 	},
 	.probe		= lp8501_probe,
 	.remove		= lp8501_remove,
 	.id_table	= lp8501_id,
 };

 module_i2c_driver(lp8501_driver);

 MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
 MODULE_AUTHOR("Milo Kim");
 MODULE_LICENSE("GPL");
	/*
	* TI LP8501 9 channel LED Driver
	*
	* Copyright (C) 2013 Texas Instruments
	*
	* Author: Milo(Woogyom) Kim <milo.kim@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/delay.h>
	#include <linux/firmware.h>
	#include <linux/i2c.h>
	#include <linux/init.h>
	#include <linux/leds.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/platform_data/leds-lp55xx.h>
	#include <linux/slab.h>

	#include "leds-lp55xx-common.h"

	#define LP8501_PROGRAM_LENGTH 32
	#define LP8501_MAX_LEDS 9

	/* Registers */
	#define LP8501_REG_ENABLE 0x00
	#define LP8501_ENABLE BIT(6)
	#define LP8501_EXEC_M 0x3F
	#define LP8501_EXEC_ENG1_M 0x30
	#define LP8501_EXEC_ENG2_M 0x0C
	#define LP8501_EXEC_ENG3_M 0x03
	#define LP8501_RUN_ENG1 0x20
	#define LP8501_RUN_ENG2 0x08
	#define LP8501_RUN_ENG3 0x02

	#define LP8501_REG_OP_MODE 0x01
	#define LP8501_MODE_ENG1_M 0x30
	#define LP8501_MODE_ENG2_M 0x0C
	#define LP8501_MODE_ENG3_M 0x03
	#define LP8501_LOAD_ENG1 0x10
	#define LP8501_LOAD_ENG2 0x04
	#define LP8501_LOAD_ENG3 0x01

	#define LP8501_REG_PWR_CONFIG 0x05
	#define LP8501_PWR_CONFIG_M 0x03

	#define LP8501_REG_LED_PWM_BASE 0x16

	#define LP8501_REG_LED_CURRENT_BASE 0x26

	#define LP8501_REG_CONFIG 0x36
	#define LP8501_PWM_PSAVE BIT(7)
	#define LP8501_AUTO_INC BIT(6)
	#define LP8501_PWR_SAVE BIT(5)
	#define LP8501_CP_AUTO 0x18
	#define LP8501_INT_CLK BIT(0)
	#define LP8501_DEFAULT_CFG \
	(LP8501_PWM_PSAVE \| LP8501_AUTO_INC \| LP8501_PWR_SAVE \| LP8501_CP_AUTO)

	#define LP8501_REG_RESET 0x3D
	#define LP8501_RESET 0xFF

	#define LP8501_REG_PROG_PAGE_SEL 0x4F
	#define LP8501_PAGE_ENG1 0
	#define LP8501_PAGE_ENG2 1
	#define LP8501_PAGE_ENG3 2

	#define LP8501_REG_PROG_MEM 0x50

	#define LP8501_ENG1_IS_LOADING(mode) \
	((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
	#define LP8501_ENG2_IS_LOADING(mode) \
	((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
	#define LP8501_ENG3_IS_LOADING(mode) \
	((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)

	static inline void lp8501_wait_opmode_done(void)
	{
	usleep_range(1000, 2000);
	}

	static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
	{
	led->led_current = led_current;
	lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
	led_current);
	}

	static int lp8501_post_init_device(struct lp55xx_chip *chip)
	{
	int ret;
	u8 val = LP8501_DEFAULT_CFG;

	ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
	if (ret)
	return ret;

	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
	usleep_range(1000, 2000);

	if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
	val \|= LP8501_INT_CLK;

	ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
	if (ret)
	return ret;

	/* Power selection for each output */
	return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
	LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
	}

	static void lp8501_load_engine(struct lp55xx_chip *chip)
	{
	enum lp55xx_engine_index idx = chip->engine_idx;
	static const u8 mask[] = {
	[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
	[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
	[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
	};

	static const u8 val[] = {
	[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
	[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
	[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
	};

	static const u8 page_sel[] = {
	[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
	[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
	[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
	};

	lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);

	lp8501_wait_opmode_done();

	lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
	}

	static void lp8501_stop_engine(struct lp55xx_chip *chip)
	{
	lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
	lp8501_wait_opmode_done();
	}

	static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
	{
	int i;

	for (i = 0; i < LP8501_MAX_LEDS; i++)
	lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
	}

	static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
	{
	int ret;
	u8 mode;
	u8 exec;

	/* stop engine */
	if (!start) {
	lp8501_stop_engine(chip);
	lp8501_turn_off_channels(chip);
	return;
	}

	/*
	* To run the engine,
	* operation mode and enable register should updated at the same time
	*/

	ret = lp55xx_read(chip, LP8501_REG_OP_MODE, &mode);
	if (ret)
	return;

	ret = lp55xx_read(chip, LP8501_REG_ENABLE, &exec);
	if (ret)
	return;

	/* change operation mode to RUN only when each engine is loading */
	if (LP8501_ENG1_IS_LOADING(mode)) {
	mode = (mode & ~LP8501_MODE_ENG1_M) \| LP8501_RUN_ENG1;
	exec = (exec & ~LP8501_EXEC_ENG1_M) \| LP8501_RUN_ENG1;
	}

	if (LP8501_ENG2_IS_LOADING(mode)) {
	mode = (mode & ~LP8501_MODE_ENG2_M) \| LP8501_RUN_ENG2;
	exec = (exec & ~LP8501_EXEC_ENG2_M) \| LP8501_RUN_ENG2;
	}

	if (LP8501_ENG3_IS_LOADING(mode)) {
	mode = (mode & ~LP8501_MODE_ENG3_M) \| LP8501_RUN_ENG3;
	exec = (exec & ~LP8501_EXEC_ENG3_M) \| LP8501_RUN_ENG3;
	}

	lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
	lp8501_wait_opmode_done();

	lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
	}

	static int lp8501_update_program_memory(struct lp55xx_chip *chip,
	const u8 *data, size_t size)
	{
	u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
	unsigned cmd;
	char c[3];
	int update_size;
	int nrchars;
	int offset = 0;
	int ret;
	int i;

	/* clear program memory before updating */
	for (i = 0; i < LP8501_PROGRAM_LENGTH; i++)
	lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);

	i = 0;
	while ((offset < size - 1) && (i < LP8501_PROGRAM_LENGTH)) {
	/* separate sscanfs because length is working only for %s */
	ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
	if (ret != 1)
	goto err;

	ret = sscanf(c, "%2x", &cmd);
	if (ret != 1)
	goto err;

	pattern[i] = (u8)cmd;
	offset += nrchars;
	i++;
	}

	/* Each instruction is 16bit long. Check that length is even */
	if (i % 2)
	goto err;

	update_size = i;
	for (i = 0; i < update_size; i++)
	lp55xx_write(chip, LP8501_REG_PROG_MEM + i, pattern[i]);

	return 0;

	err:
	dev_err(&chip->cl->dev, "wrong pattern format\n");
	return -EINVAL;
	}

	static void lp8501_firmware_loaded(struct lp55xx_chip *chip)
	{
	const struct firmware *fw = chip->fw;

	if (fw->size > LP8501_PROGRAM_LENGTH) {
	dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
	fw->size);
	return;
	}

	/*
	* Program memory sequence
	* 1) set engine mode to "LOAD"
	* 2) write firmware data into program memory
	*/

	lp8501_load_engine(chip);
	lp8501_update_program_memory(chip, fw->data, fw->size);
	}

	static int lp8501_led_brightness(struct lp55xx_led *led)
	{
	struct lp55xx_chip *chip = led->chip;
	int ret;

	mutex_lock(&chip->lock);
	ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
	led->brightness);
	mutex_unlock(&chip->lock);

	return ret;
	}

	/* Chip specific configurations */
	static struct lp55xx_device_config lp8501_cfg = {
	.reset = {
	.addr = LP8501_REG_RESET,
	.val = LP8501_RESET,
	},
	.enable = {
	.addr = LP8501_REG_ENABLE,
	.val = LP8501_ENABLE,
	},
	.max_channel = LP8501_MAX_LEDS,
	.post_init_device = lp8501_post_init_device,
	.brightness_fn = lp8501_led_brightness,
	.set_led_current = lp8501_set_led_current,
	.firmware_cb = lp8501_firmware_loaded,
	.run_engine = lp8501_run_engine,
	};

	static int lp8501_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int ret;
	struct lp55xx_chip *chip;
	struct lp55xx_led *led;
	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
	struct device_node *np = client->dev.of_node;

	if (!pdata) {
	if (np) {
	pdata = lp55xx_of_populate_pdata(&client->dev, np);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	} else {
	dev_err(&client->dev, "no platform data\n");
	return -EINVAL;
	}
	}

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

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

	chip->cl = client;
	chip->pdata = pdata;
	chip->cfg = &lp8501_cfg;

	mutex_init(&chip->lock);

	i2c_set_clientdata(client, led);

	ret = lp55xx_init_device(chip);
	if (ret)
	goto err_init;

	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);

	ret = lp55xx_register_leds(led, chip);
	if (ret)
	goto err_register_leds;

	ret = lp55xx_register_sysfs(chip);
	if (ret) {
	dev_err(&client->dev, "registering sysfs failed\n");
	goto err_register_sysfs;
	}

	return 0;

	err_register_sysfs:
	lp55xx_unregister_leds(led, chip);
	err_register_leds:
	lp55xx_deinit_device(chip);
	err_init:
	return ret;
	}

	static int lp8501_remove(struct i2c_client *client)
	{
	struct lp55xx_led *led = i2c_get_clientdata(client);
	struct lp55xx_chip *chip = led->chip;

	lp8501_stop_engine(chip);
	lp55xx_unregister_sysfs(chip);
	lp55xx_unregister_leds(led, chip);
	lp55xx_deinit_device(chip);

	return 0;
	}

	static const struct i2c_device_id lp8501_id[] = {
	{ "lp8501", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, lp8501_id);

	#ifdef CONFIG_OF
	static const struct of_device_id of_lp8501_leds_match[] = {
	{ .compatible = "ti,lp8501", },
	{},
	};

	MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
	#endif

	static struct i2c_driver lp8501_driver = {
	.driver = {
	.name = "lp8501",
	.of_match_table = of_match_ptr(of_lp8501_leds_match),
	},
	.probe = lp8501_probe,
	.remove = lp8501_remove,
	.id_table = lp8501_id,
	};

	module_i2c_driver(lp8501_driver);

	MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
	MODULE_AUTHOR("Milo Kim");
	MODULE_LICENSE("GPL");