[deliverable/linux.git] / drivers / leds / leds-lp5521.c

/*
 * LP5521 LED chip driver.
 *
 * Copyright (C) 2010 Nokia Corporation
 * Copyright (C) 2012 Texas Instruments
 *
 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
 *          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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#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/platform_data/leds-lp55xx.h>
#include <linux/slab.h>
#include <linux/of.h>

#include "leds-lp55xx-common.h"

#define LP5521_PROGRAM_LENGTH		32
#define LP5521_MAX_LEDS			3
#define LP5521_CMD_DIRECT		0x3F

/* Registers */
#define LP5521_REG_ENABLE		0x00
#define LP5521_REG_OP_MODE		0x01
#define LP5521_REG_R_PWM		0x02
#define LP5521_REG_G_PWM		0x03
#define LP5521_REG_B_PWM		0x04
#define LP5521_REG_R_CURRENT		0x05
#define LP5521_REG_G_CURRENT		0x06
#define LP5521_REG_B_CURRENT		0x07
#define LP5521_REG_CONFIG		0x08
#define LP5521_REG_STATUS		0x0C
#define LP5521_REG_RESET		0x0D
#define LP5521_REG_R_PROG_MEM		0x10
#define LP5521_REG_G_PROG_MEM		0x30
#define LP5521_REG_B_PROG_MEM		0x50

/* Base register to set LED current */
#define LP5521_REG_LED_CURRENT_BASE	LP5521_REG_R_CURRENT
/* Base register to set the brightness */
#define LP5521_REG_LED_PWM_BASE		LP5521_REG_R_PWM

/* Bits in ENABLE register */
#define LP5521_MASTER_ENABLE		0x40	/* Chip master enable */
#define LP5521_LOGARITHMIC_PWM		0x80	/* Logarithmic PWM adjustment */
#define LP5521_EXEC_RUN			0x2A
#define LP5521_ENABLE_DEFAULT	\
	(LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
#define LP5521_ENABLE_RUN_PROGRAM	\
	(LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)

/* CONFIG register */
#define LP5521_PWM_HF			0x40	/* PWM: 0 = 256Hz, 1 = 558Hz */
#define LP5521_PWRSAVE_EN		0x20	/* 1 = Power save mode */
#define LP5521_CP_MODE_OFF		0	/* Charge pump (CP) off */
#define LP5521_CP_MODE_BYPASS		8	/* CP forced to bypass mode */
#define LP5521_CP_MODE_1X5		0x10	/* CP forced to 1.5x mode */
#define LP5521_CP_MODE_AUTO		0x18	/* Automatic mode selection */
#define LP5521_R_TO_BATT		0x04	/* R out: 0 = CP, 1 = Vbat */
#define LP5521_CLK_INT			0x01	/* Internal clock */
#define LP5521_DEFAULT_CFG		\
	(LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)

/* Status */
#define LP5521_EXT_CLK_USED		0x08

/* default R channel current register value */
#define LP5521_REG_R_CURR_DEFAULT	0xAF

/* Reset register value */
#define LP5521_RESET			0xFF

/* Program Memory Operations */
#define LP5521_MODE_R_M			0x30	/* Operation Mode Register */
#define LP5521_MODE_G_M			0x0C
#define LP5521_MODE_B_M			0x03
#define LP5521_LOAD_R			0x10
#define LP5521_LOAD_G			0x04
#define LP5521_LOAD_B			0x01

#define LP5521_R_IS_LOADING(mode)	\
	((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
#define LP5521_G_IS_LOADING(mode)	\
	((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
#define LP5521_B_IS_LOADING(mode)	\
	((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)

#define LP5521_EXEC_R_M			0x30	/* Enable Register */
#define LP5521_EXEC_G_M			0x0C
#define LP5521_EXEC_B_M			0x03
#define LP5521_EXEC_M			0x3F
#define LP5521_RUN_R			0x20
#define LP5521_RUN_G			0x08
#define LP5521_RUN_B			0x02

static inline void lp5521_wait_opmode_done(void)
{
	/* operation mode change needs to be longer than 153 us */
	usleep_range(200, 300);
}

static inline void lp5521_wait_enable_done(void)
{
	/* it takes more 488 us to update ENABLE register */
	usleep_range(500, 600);
}

static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
{
	led->led_current = led_current;
	lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
		led_current);
}

static void lp5521_load_engine(struct lp55xx_chip *chip)
{
	enum lp55xx_engine_index idx = chip->engine_idx;
	u8 mask[] = {
		[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
		[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
		[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
	};

	u8 val[] = {
		[LP55XX_ENGINE_1] = LP5521_LOAD_R,
		[LP55XX_ENGINE_2] = LP5521_LOAD_G,
		[LP55XX_ENGINE_3] = LP5521_LOAD_B,
	};

	lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);

	lp5521_wait_opmode_done();
}

static void lp5521_stop_engine(struct lp55xx_chip *chip)
{
	lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
	lp5521_wait_opmode_done();
}

static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
{
	int ret;
	u8 mode;
	u8 exec;

	/* stop engine */
	if (!start) {
		lp5521_stop_engine(chip);
		lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
		lp5521_wait_opmode_done();
		return;
	}

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

	ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
	if (ret)
		return;

	ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
	if (ret)
		return;

	/* change operation mode to RUN only when each engine is loading */
	if (LP5521_R_IS_LOADING(mode)) {
		mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
		exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
	}

	if (LP5521_G_IS_LOADING(mode)) {
		mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
		exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
	}

	if (LP5521_B_IS_LOADING(mode)) {
		mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
		exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
	}

	lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
	lp5521_wait_opmode_done();

	lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
	lp5521_wait_enable_done();
}

static int lp5521_update_program_memory(struct lp55xx_chip *chip,
					const u8 *data, size_t size)
{
	enum lp55xx_engine_index idx = chip->engine_idx;
	u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
	u8 addr[] = {
		[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
		[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
		[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
	};
	unsigned cmd;
	char c[3];
	int program_size;
	int nrchars;
	int offset = 0;
	int ret;
	int i;

	/* clear program memory before updating */
	for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
		lp55xx_write(chip, addr[idx] + i, 0);

	i = 0;
	while ((offset < size - 1) && (i < LP5521_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;

	program_size = i;
	for (i = 0; i < program_size; i++)
		lp55xx_write(chip, addr[idx] + i, pattern[i]);

	return 0;

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

static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
{
	const struct firmware *fw = chip->fw;

	if (fw->size > LP5521_PROGRAM_LENGTH) {
		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
			fw->size);
		return;
	}

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

	lp5521_load_engine(chip);
	lp5521_update_program_memory(chip, fw->data, fw->size);
}

static int lp5521_post_init_device(struct lp55xx_chip *chip)
{
	int ret;
	u8 val;

	/*
	 * Make sure that the chip is reset by reading back the r channel
	 * current reg. This is dummy read is required on some platforms -
	 * otherwise further access to the R G B channels in the
	 * LP5521_REG_ENABLE register will not have any effect - strange!
	 */
	ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
	if (ret) {
		dev_err(&chip->cl->dev, "error in resetting chip\n");
		return ret;
	}
	if (val != LP5521_REG_R_CURR_DEFAULT) {
		dev_err(&chip->cl->dev,
			"unexpected data in register (expected 0x%x got 0x%x)\n",
			LP5521_REG_R_CURR_DEFAULT, val);
		ret = -EINVAL;
		return ret;
	}
	usleep_range(10000, 20000);

	/* Set all PWMs to direct control mode */
	ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);

	/* Update configuration for the clock setting */
	val = LP5521_DEFAULT_CFG;
	if (!lp55xx_is_extclk_used(chip))
		val |= LP5521_CLK_INT;

	ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
	if (ret)
		return ret;

	/* Initialize all channels PWM to zero -> leds off */
	lp55xx_write(chip, LP5521_REG_R_PWM, 0);
	lp55xx_write(chip, LP5521_REG_G_PWM, 0);
	lp55xx_write(chip, LP5521_REG_B_PWM, 0);

	/* Set engines are set to run state when OP_MODE enables engines */
	ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
	if (ret)
		return ret;

	lp5521_wait_enable_done();

	return 0;
}

static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
{
	struct lp55xx_platform_data *pdata = chip->pdata;
	int ret;
	u8 status;

	ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
	if (ret < 0)
		return ret;

	if (pdata->clock_mode != LP55XX_CLOCK_EXT)
		return 0;

	/* Check that ext clock is really in use if requested */
	if  ((status & LP5521_EXT_CLK_USED) == 0)
		return -EIO;

	return 0;
}

static void lp5521_led_brightness_work(struct work_struct *work)
{
	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
					      brightness_work);
	struct lp55xx_chip *chip = led->chip;

	mutex_lock(&chip->lock);
	lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
		led->brightness);
	mutex_unlock(&chip->lock);
}

static ssize_t lp5521_selftest(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;
	int ret;

	mutex_lock(&chip->lock);
	ret = lp5521_run_selftest(chip, buf);
	mutex_unlock(&chip->lock);

	return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
}

/* device attributes */
static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);

static struct attribute *lp5521_attributes[] = {
	&dev_attr_selftest.attr,
	NULL
};

static const struct attribute_group lp5521_group = {
	.attrs = lp5521_attributes,
};

/* Chip specific configurations */
static struct lp55xx_device_config lp5521_cfg = {
	.reset = {
		.addr = LP5521_REG_RESET,
		.val  = LP5521_RESET,
	},
	.enable = {
		.addr = LP5521_REG_ENABLE,
		.val  = LP5521_ENABLE_DEFAULT,
	},
	.max_channel  = LP5521_MAX_LEDS,
	.post_init_device   = lp5521_post_init_device,
	.brightness_work_fn = lp5521_led_brightness_work,
	.set_led_current    = lp5521_set_led_current,
	.firmware_cb        = lp5521_firmware_loaded,
	.run_engine         = lp5521_run_engine,
	.dev_attr_group     = &lp5521_group,
};

static int lp5521_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;
	struct device_node *np = client->dev.of_node;

	if (!client->dev.platform_data) {
		if (np) {
			ret = lp55xx_of_populate_pdata(&client->dev, np);
			if (ret < 0)
				return ret;
		} else {
			dev_err(&client->dev, "no platform data\n");
			return -EINVAL;
		}
	}
	pdata = client->dev.platform_data;

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

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

	chip->cl = client;
	chip->pdata = pdata;
	chip->cfg = &lp5521_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 lp5521_remove(struct i2c_client *client)
{
	struct lp55xx_led *led = i2c_get_clientdata(client);
	struct lp55xx_chip *chip = led->chip;

	lp5521_stop_engine(chip);
	lp55xx_unregister_sysfs(chip);
	lp55xx_unregister_leds(led, chip);
	lp55xx_deinit_device(chip);

	return 0;
}

static const struct i2c_device_id lp5521_id[] = {
	{ "lp5521", 0 }, /* Three channel chip */
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp5521_id);

#ifdef CONFIG_OF
static const struct of_device_id of_lp5521_leds_match[] = {
	{ .compatible = "national,lp5521", },
	{},
};

MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
#endif
static struct i2c_driver lp5521_driver = {
	.driver = {
		.name	= "lp5521",
		.of_match_table = of_match_ptr(of_lp5521_leds_match),
	},
	.probe		= lp5521_probe,
	.remove		= lp5521_remove,
	.id_table	= lp5521_id,
};

module_i2c_driver(lp5521_driver);

MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP5521 LED engine");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
500fe141 SO	1	/*
	2	* LP5521 LED chip driver.
	3	*
	4	* Copyright (C) 2010 Nokia Corporation
a2387cb9	5	* Copyright (C) 2012 Texas Instruments
500fe141 SO	6	*
500fe141 SO	7	* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
a2387cb9	8	* Milo(Woogyom) Kim <milo.kim@ti.com>
500fe141 SO	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* version 2 as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	22	* 02110-1301 USA
	23	*/
	24
500fe141	25	#include <linux/delay.h>
79bcc10b MWK	26	#include <linux/firmware.h>
	27	#include <linux/i2c.h>
	28	#include <linux/init.h>
500fe141	29	#include <linux/leds.h>
79bcc10b MWK	30	#include <linux/module.h>
79bcc10b MWK	31	#include <linux/mutex.h>
6a0c9a47	32	#include <linux/platform_data/leds-lp55xx.h>
79bcc10b	33	#include <linux/slab.h>
7542a04b	34	#include <linux/of.h>
6a0c9a47 MWK	35
6a0c9a47 MWK	36	#include "leds-lp55xx-common.h"
500fe141	37
12f022d2 MWK	38	#define LP5521_PROGRAM_LENGTH 32
	39	#define LP5521_MAX_LEDS 3
	40	#define LP5521_CMD_DIRECT 0x3F
500fe141 SO	41
	42	/* Registers */
	43	#define LP5521_REG_ENABLE 0x00
	44	#define LP5521_REG_OP_MODE 0x01
	45	#define LP5521_REG_R_PWM 0x02
	46	#define LP5521_REG_G_PWM 0x03
	47	#define LP5521_REG_B_PWM 0x04
	48	#define LP5521_REG_R_CURRENT 0x05
	49	#define LP5521_REG_G_CURRENT 0x06
	50	#define LP5521_REG_B_CURRENT 0x07
	51	#define LP5521_REG_CONFIG 0x08
500fe141 SO	52	#define LP5521_REG_STATUS 0x0C
500fe141 SO	53	#define LP5521_REG_RESET 0x0D
500fe141 SO	54	#define LP5521_REG_R_PROG_MEM 0x10
	55	#define LP5521_REG_G_PROG_MEM 0x30
	56	#define LP5521_REG_B_PROG_MEM 0x50
	57
500fe141 SO	58	/* Base register to set LED current */
500fe141 SO	59	#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
500fe141 SO	60	/* Base register to set the brightness */
	61	#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
	62
	63	/* Bits in ENABLE register */
	64	#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
	65	#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
	66	#define LP5521_EXEC_RUN 0x2A
32a2f747 KM	67	#define LP5521_ENABLE_DEFAULT \
	68	(LP5521_MASTER_ENABLE \| LP5521_LOGARITHMIC_PWM)
	69	#define LP5521_ENABLE_RUN_PROGRAM \
	70	(LP5521_ENABLE_DEFAULT \| LP5521_EXEC_RUN)
500fe141	71
81f2a5b4 KM	72	/* CONFIG register */
	73	#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
	74	#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
	75	#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
	76	#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
	77	#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
	78	#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
	79	#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
	80	#define LP5521_CLK_INT 0x01 /* Internal clock */
	81	#define LP5521_DEFAULT_CFG \
	82	(LP5521_PWM_HF \| LP5521_PWRSAVE_EN \| LP5521_CP_MODE_AUTO)
	83
500fe141 SO	84	/* Status */
	85	#define LP5521_EXT_CLK_USED 0x08
	86
b3c49c05 SK	87	/* default R channel current register value */
	88	#define LP5521_REG_R_CURR_DEFAULT 0xAF
	89
48068d5d MWK	90	/* Reset register value */
	91	#define LP5521_RESET 0xFF
	92
9ce7cb17 MWK	93	/* Program Memory Operations */
	94	#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
	95	#define LP5521_MODE_G_M 0x0C
	96	#define LP5521_MODE_B_M 0x03
	97	#define LP5521_LOAD_R 0x10
	98	#define LP5521_LOAD_G 0x04
	99	#define LP5521_LOAD_B 0x01
	100
	101	#define LP5521_R_IS_LOADING(mode) \
	102	((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
	103	#define LP5521_G_IS_LOADING(mode) \
	104	((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
	105	#define LP5521_B_IS_LOADING(mode) \
	106	((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
	107
	108	#define LP5521_EXEC_R_M 0x30 /* Enable Register */
	109	#define LP5521_EXEC_G_M 0x0C
	110	#define LP5521_EXEC_B_M 0x03
	111	#define LP5521_EXEC_M 0x3F
	112	#define LP5521_RUN_R 0x20
	113	#define LP5521_RUN_G 0x08
	114	#define LP5521_RUN_B 0x02
500fe141	115
9ce7cb17 MWK	116	static inline void lp5521_wait_opmode_done(void)
	117	{
	118	/* operation mode change needs to be longer than 153 us */
	119	usleep_range(200, 300);
	120	}
	121
94482174 MWK	122	static inline void lp5521_wait_enable_done(void)
	123	{
	124	/* it takes more 488 us to update ENABLE register */
	125	usleep_range(500, 600);
	126	}
	127
a96bfa13 MWK	128	static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
	129	{
	130	led->led_current = led_current;
	131	lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
	132	led_current);
	133	}
	134
9ce7cb17	135	static void lp5521_load_engine(struct lp55xx_chip *chip)
500fe141	136	{
9ce7cb17 MWK	137	enum lp55xx_engine_index idx = chip->engine_idx;
	138	u8 mask[] = {
	139	[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
	140	[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
	141	[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
	142	};
500fe141	143
9ce7cb17 MWK	144	u8 val[] = {
	145	[LP55XX_ENGINE_1] = LP5521_LOAD_R,
	146	[LP55XX_ENGINE_2] = LP5521_LOAD_G,
	147	[LP55XX_ENGINE_3] = LP5521_LOAD_B,
	148	};
500fe141	149
9ce7cb17	150	lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
500fe141	151
9ce7cb17 MWK	152	lp5521_wait_opmode_done();
9ce7cb17 MWK	153	}
500fe141	154
9ce7cb17 MWK	155	static void lp5521_stop_engine(struct lp55xx_chip *chip)
	156	{
	157	lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
	158	lp5521_wait_opmode_done();
500fe141 SO	159	}
500fe141 SO	160
9ce7cb17	161	static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
500fe141	162	{
500fe141	163	int ret;
500fe141	164	u8 mode;
9ce7cb17	165	u8 exec;
500fe141	166
9ce7cb17 MWK	167	/* stop engine */
	168	if (!start) {
	169	lp5521_stop_engine(chip);
	170	lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
	171	lp5521_wait_opmode_done();
	172	return;
	173	}
	174
	175	/*
	176	* To run the engine,
	177	* operation mode and enable register should updated at the same time
	178	*/
	179
	180	ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
5bc9ad77	181	if (ret)
9ce7cb17	182	return;
5bc9ad77	183
9ce7cb17	184	ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
5bc9ad77	185	if (ret)
9ce7cb17 MWK	186	return;
	187
	188	/* change operation mode to RUN only when each engine is loading */
	189	if (LP5521_R_IS_LOADING(mode)) {
	190	mode = (mode & ~LP5521_MODE_R_M) \| LP5521_RUN_R;
	191	exec = (exec & ~LP5521_EXEC_R_M) \| LP5521_RUN_R;
	192	}
	193
	194	if (LP5521_G_IS_LOADING(mode)) {
	195	mode = (mode & ~LP5521_MODE_G_M) \| LP5521_RUN_G;
	196	exec = (exec & ~LP5521_EXEC_G_M) \| LP5521_RUN_G;
	197	}
	198
	199	if (LP5521_B_IS_LOADING(mode)) {
	200	mode = (mode & ~LP5521_MODE_B_M) \| LP5521_RUN_B;
	201	exec = (exec & ~LP5521_EXEC_B_M) \| LP5521_RUN_B;
	202	}
	203
	204	lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
	205	lp5521_wait_opmode_done();
	206
	207	lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
	208	lp5521_wait_enable_done();
	209	}
	210
	211	static int lp5521_update_program_memory(struct lp55xx_chip *chip,
	212	const u8 *data, size_t size)
	213	{
	214	enum lp55xx_engine_index idx = chip->engine_idx;
	215	u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
	216	u8 addr[] = {
	217	[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
	218	[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
	219	[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
	220	};
	221	unsigned cmd;
	222	char c[3];
	223	int program_size;
	224	int nrchars;
	225	int offset = 0;
	226	int ret;
	227	int i;
	228
	229	/* clear program memory before updating */
	230	for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
	231	lp55xx_write(chip, addr[idx] + i, 0);
	232
	233	i = 0;
	234	while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
	235	/* separate sscanfs because length is working only for %s */
	236	ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
	237	if (ret != 1)
	238	goto err;
	239
	240	ret = sscanf(c, "%2x", &cmd);
	241	if (ret != 1)
	242	goto err;
	243
	244	pattern[i] = (u8)cmd;
	245	offset += nrchars;
	246	i++;
	247	}
	248
	249	/* Each instruction is 16bit long. Check that length is even */
250	if (i % 2)
251	goto err;
252
253	program_size = i;
254	for (i = 0; i < program_size; i++)
255	lp55xx_write(chip, addr[idx] + i, pattern[i]);
256
257	return 0;
258
259	err:
260	dev_err(&chip->cl->dev, "wrong pattern format\n");
261	return -EINVAL;
262	}
263
264	static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
265	{
266	const struct firmware *fw = chip->fw;
267
268	if (fw->size > LP5521_PROGRAM_LENGTH) {
269	dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
270	fw->size);
271	return;
272	}
500fe141	273
9ce7cb17 MWK	274	/*
	275	* Program momery sequence
	276	* 1) set engine mode to "LOAD"
	277	* 2) write firmware data into program memory
	278	*/
	279
	280	lp5521_load_engine(chip);
	281	lp5521_update_program_memory(chip, fw->data, fw->size);
500fe141 SO	282	}
500fe141 SO	283
ffbdccdb	284	static int lp5521_post_init_device(struct lp55xx_chip *chip)
500fe141	285	{
500fe141	286	int ret;
94482174	287	u8 val;
500fe141	288
94482174 MWK	289	/*
	290	* Make sure that the chip is reset by reading back the r channel
	291	* current reg. This is dummy read is required on some platforms -
	292	* otherwise further access to the R G B channels in the
	293	* LP5521_REG_ENABLE register will not have any effect - strange!
	294	*/
ffbdccdb	295	ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
94482174	296	if (ret) {
ffbdccdb	297	dev_err(&chip->cl->dev, "error in resetting chip\n");
94482174 MWK	298	return ret;
	299	}
	300	if (val != LP5521_REG_R_CURR_DEFAULT) {
ffbdccdb	301	dev_err(&chip->cl->dev,
94482174 MWK	302	"unexpected data in register (expected 0x%x got 0x%x)\n",
	303	LP5521_REG_R_CURR_DEFAULT, val);
	304	ret = -EINVAL;
	305	return ret;
	306	}
	307	usleep_range(10000, 20000);
500fe141	308
500fe141	309	/* Set all PWMs to direct control mode */
ffbdccdb	310	ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
500fe141	311
81f2a5b4 KM	312	/* Update configuration for the clock setting */
	313	val = LP5521_DEFAULT_CFG;
	314	if (!lp55xx_is_extclk_used(chip))
	315	val \|= LP5521_CLK_INT;
	316
ffbdccdb	317	ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
94482174 MWK	318	if (ret)
94482174 MWK	319	return ret;
500fe141 SO	320
500fe141 SO	321	/* Initialize all channels PWM to zero -> leds off */
ffbdccdb MWK	322	lp55xx_write(chip, LP5521_REG_R_PWM, 0);
	323	lp55xx_write(chip, LP5521_REG_G_PWM, 0);
	324	lp55xx_write(chip, LP5521_REG_B_PWM, 0);
500fe141 SO	325
500fe141 SO	326	/* Set engines are set to run state when OP_MODE enables engines */
ffbdccdb	327	ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
94482174 MWK	328	if (ret)
94482174 MWK	329	return ret;
500fe141	330
94482174 MWK	331	lp5521_wait_enable_done();
	332
	333	return 0;
500fe141 SO	334	}
500fe141 SO	335
9ca3bd80	336	static int lp5521_run_selftest(struct lp55xx_chip chip, char buf)
500fe141	337	{
9ca3bd80	338	struct lp55xx_platform_data *pdata = chip->pdata;
500fe141 SO	339	int ret;
	340	u8 status;
	341
9ca3bd80	342	ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
500fe141 SO	343	if (ret < 0)
	344	return ret;
	345
9ca3bd80 MWK	346	if (pdata->clock_mode != LP55XX_CLOCK_EXT)
	347	return 0;
	348
500fe141	349	/* Check that ext clock is really in use if requested */
9ca3bd80 MWK	350	if ((status & LP5521_EXT_CLK_USED) == 0)
	351	return -EIO;
	352
500fe141 SO	353	return 0;
	354	}
	355
500fe141 SO	356	static void lp5521_led_brightness_work(struct work_struct *work)
500fe141 SO	357	{
a6e4679a	358	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
500fe141	359	brightness_work);
a6e4679a	360	struct lp55xx_chip *chip = led->chip;
500fe141 SO	361
500fe141 SO	362	mutex_lock(&chip->lock);
a6e4679a	363	lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
500fe141 SO	364	led->brightness);
	365	mutex_unlock(&chip->lock);
	366	}
	367
500fe141 SO	368	static ssize_t lp5521_selftest(struct device *dev,
	369	struct device_attribute *attr,
	370	char *buf)
	371	{
9ca3bd80 MWK	372	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
9ca3bd80 MWK	373	struct lp55xx_chip *chip = led->chip;
500fe141 SO	374	int ret;
	375
	376	mutex_lock(&chip->lock);
	377	ret = lp5521_run_selftest(chip, buf);
	378	mutex_unlock(&chip->lock);
24d32128 KM	379
24d32128 KM	380	return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
500fe141 SO	381	}
500fe141 SO	382
500fe141	383	/* device attributes */
500fe141 SO	384	static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
	385
	386	static struct attribute *lp5521_attributes[] = {
500fe141	387	&dev_attr_selftest.attr,
500fe141 SO	388	NULL
	389	};
	390
	391	static const struct attribute_group lp5521_group = {
	392	.attrs = lp5521_attributes,
	393	};
	394
48068d5d MWK	395	/* Chip specific configurations */
	396	static struct lp55xx_device_config lp5521_cfg = {
	397	.reset = {
	398	.addr = LP5521_REG_RESET,
	399	.val = LP5521_RESET,
	400	},
e3a700d8 MWK	401	.enable = {
	402	.addr = LP5521_REG_ENABLE,
	403	.val = LP5521_ENABLE_DEFAULT,
	404	},
0e202346	405	.max_channel = LP5521_MAX_LEDS,
ffbdccdb	406	.post_init_device = lp5521_post_init_device,
a6e4679a	407	.brightness_work_fn = lp5521_led_brightness_work,
a96bfa13	408	.set_led_current = lp5521_set_led_current,
9ce7cb17 MWK	409	.firmware_cb = lp5521_firmware_loaded,
9ce7cb17 MWK	410	.run_engine = lp5521_run_engine,
e73c0ce6	411	.dev_attr_group = &lp5521_group,
48068d5d MWK	412	};
48068d5d MWK	413
98ea1ea2	414	static int lp5521_probe(struct i2c_client *client,
500fe141 SO	415	const struct i2c_device_id *id)
500fe141 SO	416	{
1904f83d	417	int ret;
6a0c9a47 MWK	418	struct lp55xx_chip *chip;
6a0c9a47 MWK	419	struct lp55xx_led *led;
7542a04b LW	420	struct lp55xx_platform_data *pdata;
	421	struct device_node *np = client->dev.of_node;
	422
	423	if (!client->dev.platform_data) {
	424	if (np) {
	425	ret = lp55xx_of_populate_pdata(&client->dev, np);
	426	if (ret < 0)
	427	return ret;
	428	} else {
	429	dev_err(&client->dev, "no platform data\n");
	430	return -EINVAL;
	431	}
500fe141	432	}
7542a04b	433	pdata = client->dev.platform_data;
500fe141	434
6a0c9a47 MWK	435	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	436	if (!chip)
	437	return -ENOMEM;
	438
	439	led = devm_kzalloc(&client->dev,
	440	sizeof(led) pdata->num_channels, GFP_KERNEL);
	441	if (!led)
	442	return -ENOMEM;
	443
	444	chip->cl = client;
	445	chip->pdata = pdata;
48068d5d	446	chip->cfg = &lp5521_cfg;
6a0c9a47 MWK	447
6a0c9a47 MWK	448	mutex_init(&chip->lock);
500fe141	449
6a0c9a47	450	i2c_set_clientdata(client, led);
500fe141	451
22ebeb48	452	ret = lp55xx_init_device(chip);
944f7b1d	453	if (ret)
f6c64c6f	454	goto err_init;
500fe141 SO	455
	456	dev_info(&client->dev, "%s programmable led chip found\n", id->name);
	457
9e9b3db1	458	ret = lp55xx_register_leds(led, chip);
f6524808	459	if (ret)
9e9b3db1	460	goto err_register_leds;
500fe141	461
e73c0ce6	462	ret = lp55xx_register_sysfs(chip);
500fe141 SO	463	if (ret) {
500fe141 SO	464	dev_err(&client->dev, "registering sysfs failed\n");
e73c0ce6	465	goto err_register_sysfs;
500fe141	466	}
e73c0ce6 MWK	467
	468	return 0;
	469
	470	err_register_sysfs:
c3a68ebf	471	lp55xx_unregister_leds(led, chip);
9e9b3db1	472	err_register_leds:
6ce61762	473	lp55xx_deinit_device(chip);
f6c64c6f	474	err_init:
500fe141 SO	475	return ret;
	476	}
	477
678e8a6b	478	static int lp5521_remove(struct i2c_client *client)
500fe141	479	{
6ce61762 MWK	480	struct lp55xx_led *led = i2c_get_clientdata(client);
6ce61762 MWK	481	struct lp55xx_chip *chip = led->chip;
500fe141	482
87cc4bde MWK	483	lp5521_stop_engine(chip);
87cc4bde MWK	484	lp55xx_unregister_sysfs(chip);
c3a68ebf	485	lp55xx_unregister_leds(led, chip);
6ce61762	486	lp55xx_deinit_device(chip);
500fe141	487
500fe141 SO	488	return 0;
	489	}
	490
	491	static const struct i2c_device_id lp5521_id[] = {
	492	{ "lp5521", 0 }, /* Three channel chip */
	493	{ }
	494	};
	495	MODULE_DEVICE_TABLE(i2c, lp5521_id);
	496
b548a34b AL	497	#ifdef CONFIG_OF
	498	static const struct of_device_id of_lp5521_leds_match[] = {
	499	{ .compatible = "national,lp5521", },
	500	{},
	501	};
	502
	503	MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
	504	#endif
500fe141 SO	505	static struct i2c_driver lp5521_driver = {
	506	.driver = {
	507	.name = "lp5521",
b548a34b	508	.of_match_table = of_match_ptr(of_lp5521_leds_match),
500fe141 SO	509	},
500fe141 SO	510	.probe = lp5521_probe,
df07cf81	511	.remove = lp5521_remove,
500fe141 SO	512	.id_table = lp5521_id,
	513	};
	514
09a0d183	515	module_i2c_driver(lp5521_driver);
500fe141 SO	516
500fe141 SO	517	MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
a2387cb9	518	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
500fe141 SO	519	MODULE_DESCRIPTION("LP5521 LED engine");
500fe141 SO	520	MODULE_LICENSE("GPL v2");