[linux-block.git] / drivers / leds / leds-lp8501.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI LP8501 9 channel LED Driver
 *
 * Copyright (C) 2013 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 */

#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 = dev_of_node(&client->dev);

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

	chip->cfg = &lp8501_cfg;

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

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

	chip->cl = client;
	chip->pdata = pdata;

	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_out;

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

	return 0;

err_out:
	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_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");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
33b3a561 KM	2	/*
	3	* TI LP8501 9 channel LED Driver
	4	*
	5	* Copyright (C) 2013 Texas Instruments
	6	*
	7	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
33b3a561 KM	8	*/
	9
	10	#include <linux/delay.h>
	11	#include <linux/firmware.h>
	12	#include <linux/i2c.h>
	13	#include <linux/init.h>
	14	#include <linux/leds.h>
	15	#include <linux/module.h>
	16	#include <linux/mutex.h>
c68f46dd	17	#include <linux/of.h>
33b3a561 KM	18	#include <linux/platform_data/leds-lp55xx.h>
	19	#include <linux/slab.h>
	20
	21	#include "leds-lp55xx-common.h"
	22
	23	#define LP8501_PROGRAM_LENGTH 32
	24	#define LP8501_MAX_LEDS 9
	25
	26	/* Registers */
	27	#define LP8501_REG_ENABLE 0x00
	28	#define LP8501_ENABLE BIT(6)
	29	#define LP8501_EXEC_M 0x3F
	30	#define LP8501_EXEC_ENG1_M 0x30
	31	#define LP8501_EXEC_ENG2_M 0x0C
	32	#define LP8501_EXEC_ENG3_M 0x03
	33	#define LP8501_RUN_ENG1 0x20
	34	#define LP8501_RUN_ENG2 0x08
	35	#define LP8501_RUN_ENG3 0x02
	36
	37	#define LP8501_REG_OP_MODE 0x01
	38	#define LP8501_MODE_ENG1_M 0x30
	39	#define LP8501_MODE_ENG2_M 0x0C
	40	#define LP8501_MODE_ENG3_M 0x03
	41	#define LP8501_LOAD_ENG1 0x10
	42	#define LP8501_LOAD_ENG2 0x04
	43	#define LP8501_LOAD_ENG3 0x01
	44
	45	#define LP8501_REG_PWR_CONFIG 0x05
	46	#define LP8501_PWR_CONFIG_M 0x03
	47
	48	#define LP8501_REG_LED_PWM_BASE 0x16
	49
	50	#define LP8501_REG_LED_CURRENT_BASE 0x26
	51
	52	#define LP8501_REG_CONFIG 0x36
	53	#define LP8501_PWM_PSAVE BIT(7)
	54	#define LP8501_AUTO_INC BIT(6)
	55	#define LP8501_PWR_SAVE BIT(5)
	56	#define LP8501_CP_AUTO 0x18
	57	#define LP8501_INT_CLK BIT(0)
	58	#define LP8501_DEFAULT_CFG \
	59	(LP8501_PWM_PSAVE \| LP8501_AUTO_INC \| LP8501_PWR_SAVE \| LP8501_CP_AUTO)
	60
	61	#define LP8501_REG_RESET 0x3D
	62	#define LP8501_RESET 0xFF
	63
	64	#define LP8501_REG_PROG_PAGE_SEL 0x4F
	65	#define LP8501_PAGE_ENG1 0
	66	#define LP8501_PAGE_ENG2 1
	67	#define LP8501_PAGE_ENG3 2
	68
	69	#define LP8501_REG_PROG_MEM 0x50
	70
	71	#define LP8501_ENG1_IS_LOADING(mode) \
	72	((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
	73	#define LP8501_ENG2_IS_LOADING(mode) \
	74	((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
	75	#define LP8501_ENG3_IS_LOADING(mode) \
	76	((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)
	77
	78	static inline void lp8501_wait_opmode_done(void)
	79	{
	80	usleep_range(1000, 2000);
	81	}
82
83	static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
84	{
85	led->led_current = led_current;
86	lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
87	led_current);
88	}
89
90	static int lp8501_post_init_device(struct lp55xx_chip *chip)
91	{
92	int ret;
93	u8 val = LP8501_DEFAULT_CFG;
94
95	ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
96	if (ret)
97	return ret;
98
99	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
100	usleep_range(1000, 2000);
101
102	if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
103	val \|= LP8501_INT_CLK;
104
105	ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
106	if (ret)
107	return ret;
108
109	/* Power selection for each output */
110	return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
111	LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
112	}
113
114	static void lp8501_load_engine(struct lp55xx_chip *chip)
115	{
116	enum lp55xx_engine_index idx = chip->engine_idx;
34b558a5	117	static const u8 mask[] = {
33b3a561 KM	118	[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
	119	[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
	120	[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
	121	};
	122
34b558a5	123	static const u8 val[] = {
33b3a561 KM	124	[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
	125	[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
	126	[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
	127	};
	128
34b558a5	129	static const u8 page_sel[] = {
33b3a561 KM	130	[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
	131	[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
	132	[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
	133	};
	134
	135	lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);
	136
	137	lp8501_wait_opmode_done();
	138
	139	lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
	140	}
	141
	142	static void lp8501_stop_engine(struct lp55xx_chip *chip)
	143	{
	144	lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
	145	lp8501_wait_opmode_done();
	146	}
	147
	148	static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
	149	{
	150	int i;
	151
	152	for (i = 0; i < LP8501_MAX_LEDS; i++)
	153	lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
	154	}
	155
	156	static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
	157	{
	158	int ret;
	159	u8 mode;
	160	u8 exec;
	161
	162	/* stop engine */
	163	if (!start) {
	164	lp8501_stop_engine(chip);
	165	lp8501_turn_off_channels(chip);
	166	return;
	167	}
	168
	169	/*
	170	* To run the engine,
	171	* operation mode and enable register should updated at the same time
	172	*/
	173
	174	ret = lp55xx_read(chip, LP8501_REG_OP_MODE, &mode);
	175	if (ret)
	176	return;
	177
	178	ret = lp55xx_read(chip, LP8501_REG_ENABLE, &exec);
	179	if (ret)
	180	return;
	181
	182	/* change operation mode to RUN only when each engine is loading */
	183	if (LP8501_ENG1_IS_LOADING(mode)) {
	184	mode = (mode & ~LP8501_MODE_ENG1_M) \| LP8501_RUN_ENG1;
	185	exec = (exec & ~LP8501_EXEC_ENG1_M) \| LP8501_RUN_ENG1;
	186	}
	187
	188	if (LP8501_ENG2_IS_LOADING(mode)) {
	189	mode = (mode & ~LP8501_MODE_ENG2_M) \| LP8501_RUN_ENG2;
	190	exec = (exec & ~LP8501_EXEC_ENG2_M) \| LP8501_RUN_ENG2;
	191	}
	192
	193	if (LP8501_ENG3_IS_LOADING(mode)) {
194	mode = (mode & ~LP8501_MODE_ENG3_M) \| LP8501_RUN_ENG3;
195	exec = (exec & ~LP8501_EXEC_ENG3_M) \| LP8501_RUN_ENG3;
196	}
197
198	lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
199	lp8501_wait_opmode_done();
200
201	lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
202	}
203
204	static int lp8501_update_program_memory(struct lp55xx_chip *chip,
205	const u8 *data, size_t size)
206	{
207	u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
208	unsigned cmd;
209	char c[3];
210	int update_size;
211	int nrchars;
212	int offset = 0;
213	int ret;
214	int i;
215
216	/* clear program memory before updating */
217	for (i = 0; i < LP8501_PROGRAM_LENGTH; i++)
218	lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);
219
220	i = 0;
221	while ((offset < size - 1) && (i < LP8501_PROGRAM_LENGTH)) {
222	/* separate sscanfs because length is working only for %s */
223	ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
224	if (ret != 1)
225	goto err;
226
227	ret = sscanf(c, "%2x", &cmd);
228	if (ret != 1)
229	goto err;
230
231	pattern[i] = (u8)cmd;
232	offset += nrchars;
233	i++;
234	}
235
236	/* Each instruction is 16bit long. Check that length is even */
237	if (i % 2)
238	goto err;
239
240	update_size = i;
241	for (i = 0; i < update_size; i++)
242	lp55xx_write(chip, LP8501_REG_PROG_MEM + i, pattern[i]);
243
244	return 0;
245
246	err:
247	dev_err(&chip->cl->dev, "wrong pattern format\n");
248	return -EINVAL;
249	}
250
251	static void lp8501_firmware_loaded(struct lp55xx_chip *chip)
252	{
253	const struct firmware *fw = chip->fw;
254
255	if (fw->size > LP8501_PROGRAM_LENGTH) {
256	dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
257	fw->size);
258	return;
259	}
260
261	/*
bfb18d82	262	* Program memory sequence
33b3a561 KM	263	* 1) set engine mode to "LOAD"
	264	* 2) write firmware data into program memory
	265	*/
	266
	267	lp8501_load_engine(chip);
	268	lp8501_update_program_memory(chip, fw->data, fw->size);
	269	}
	270
95b2af63	271	static int lp8501_led_brightness(struct lp55xx_led *led)
33b3a561	272	{
33b3a561	273	struct lp55xx_chip *chip = led->chip;
95b2af63	274	int ret;
33b3a561 KM	275
33b3a561 KM	276	mutex_lock(&chip->lock);
95b2af63	277	ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
33b3a561 KM	278	led->brightness);
33b3a561 KM	279	mutex_unlock(&chip->lock);
95b2af63 AL	280
95b2af63 AL	281	return ret;
33b3a561 KM	282	}
	283
	284	/* Chip specific configurations */
	285	static struct lp55xx_device_config lp8501_cfg = {
	286	.reset = {
	287	.addr = LP8501_REG_RESET,
	288	.val = LP8501_RESET,
	289	},
	290	.enable = {
	291	.addr = LP8501_REG_ENABLE,
	292	.val = LP8501_ENABLE,
	293	},
	294	.max_channel = LP8501_MAX_LEDS,
	295	.post_init_device = lp8501_post_init_device,
95b2af63	296	.brightness_fn = lp8501_led_brightness,
33b3a561 KM	297	.set_led_current = lp8501_set_led_current,
	298	.firmware_cb = lp8501_firmware_loaded,
	299	.run_engine = lp8501_run_engine,
	300	};
	301
	302	static int lp8501_probe(struct i2c_client *client,
	303	const struct i2c_device_id *id)
	304	{
	305	int ret;
	306	struct lp55xx_chip *chip;
	307	struct lp55xx_led *led;
ed133352	308	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
8853c95e	309	struct device_node *np = dev_of_node(&client->dev);
33b3a561	310
92a81562 DM	311	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	312	if (!chip)
	313	return -ENOMEM;
	314
	315	chip->cfg = &lp8501_cfg;
	316
ed133352	317	if (!pdata) {
33b3a561	318	if (np) {
92a81562 DM	319	pdata = lp55xx_of_populate_pdata(&client->dev, np,
92a81562 DM	320	chip);
ed133352 MK	321	if (IS_ERR(pdata))
ed133352 MK	322	return PTR_ERR(pdata);
33b3a561 KM	323	} else {
	324	dev_err(&client->dev, "no platform data\n");
	325	return -EINVAL;
	326	}
	327	}
33b3a561	328
a86854d0 KC	329	led = devm_kcalloc(&client->dev,
a86854d0 KC	330	pdata->num_channels, sizeof(*led), GFP_KERNEL);
33b3a561 KM	331	if (!led)
	332	return -ENOMEM;
	333
	334	chip->cl = client;
	335	chip->pdata = pdata;
33b3a561 KM	336
	337	mutex_init(&chip->lock);
	338
	339	i2c_set_clientdata(client, led);
	340
	341	ret = lp55xx_init_device(chip);
	342	if (ret)
	343	goto err_init;
	344
	345	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
	346
	347	ret = lp55xx_register_leds(led, chip);
	348	if (ret)
c732eaf0	349	goto err_out;
33b3a561 KM	350
	351	ret = lp55xx_register_sysfs(chip);
	352	if (ret) {
	353	dev_err(&client->dev, "registering sysfs failed\n");
c732eaf0	354	goto err_out;
33b3a561 KM	355	}
	356
	357	return 0;
	358
c732eaf0	359	err_out:
33b3a561 KM	360	lp55xx_deinit_device(chip);
	361	err_init:
	362	return ret;
	363	}
	364
	365	static int lp8501_remove(struct i2c_client *client)
	366	{
	367	struct lp55xx_led *led = i2c_get_clientdata(client);
	368	struct lp55xx_chip *chip = led->chip;
	369
	370	lp8501_stop_engine(chip);
	371	lp55xx_unregister_sysfs(chip);
33b3a561 KM	372	lp55xx_deinit_device(chip);
	373
	374	return 0;
	375	}
	376
	377	static const struct i2c_device_id lp8501_id[] = {
	378	{ "lp8501", 0 },
	379	{ }
	380	};
	381	MODULE_DEVICE_TABLE(i2c, lp8501_id);
	382
	383	#ifdef CONFIG_OF
	384	static const struct of_device_id of_lp8501_leds_match[] = {
	385	{ .compatible = "ti,lp8501", },
	386	{},
	387	};
	388
	389	MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
	390	#endif
	391
	392	static struct i2c_driver lp8501_driver = {
	393	.driver = {
	394	.name = "lp8501",
	395	.of_match_table = of_match_ptr(of_lp8501_leds_match),
	396	},
	397	.probe = lp8501_probe,
	398	.remove = lp8501_remove,
	399	.id_table = lp8501_id,
	400	};
	401
	402	module_i2c_driver(lp8501_driver);
	403
336af37e	404	MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
33b3a561 KM	405	MODULE_AUTHOR("Milo Kim");
33b3a561 KM	406	MODULE_LICENSE("GPL");