[linux.git] / drivers / leds / leds-lm3530.c

/*
 * Copyright (C) 2011 ST-Ericsson SA.
 * Copyright (C) 2009 Motorola, Inc.
 *
 * License Terms: GNU General Public License v2
 *
 * Simple driver for National Semiconductor LM3530 Backlight driver chip
 *
 * Author: Shreshtha Kumar SAHU <[email protected]>
 * based on leds-lm3530.c by Dan Murphy <[email protected]>
 */

#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/led-lm3530.h>
#include <linux/types.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>

#define LM3530_LED_DEV "lcd-backlight"
#define LM3530_NAME "lm3530-led"

#define LM3530_GEN_CONFIG		0x10
#define LM3530_ALS_CONFIG		0x20
#define LM3530_BRT_RAMP_RATE		0x30
#define LM3530_ALS_IMP_SELECT		0x41
#define LM3530_BRT_CTRL_REG		0xA0
#define LM3530_ALS_ZB0_REG		0x60
#define LM3530_ALS_ZB1_REG		0x61
#define LM3530_ALS_ZB2_REG		0x62
#define LM3530_ALS_ZB3_REG		0x63
#define LM3530_ALS_Z0T_REG		0x70
#define LM3530_ALS_Z1T_REG		0x71
#define LM3530_ALS_Z2T_REG		0x72
#define LM3530_ALS_Z3T_REG		0x73
#define LM3530_ALS_Z4T_REG		0x74
#define LM3530_REG_MAX			14

/* General Control Register */
#define LM3530_EN_I2C_SHIFT		(0)
#define LM3530_RAMP_LAW_SHIFT		(1)
#define LM3530_MAX_CURR_SHIFT		(2)
#define LM3530_EN_PWM_SHIFT		(5)
#define LM3530_PWM_POL_SHIFT		(6)
#define LM3530_EN_PWM_SIMPLE_SHIFT	(7)

#define LM3530_ENABLE_I2C		(1 << LM3530_EN_I2C_SHIFT)
#define LM3530_ENABLE_PWM		(1 << LM3530_EN_PWM_SHIFT)
#define LM3530_POL_LOW			(1 << LM3530_PWM_POL_SHIFT)
#define LM3530_ENABLE_PWM_SIMPLE	(1 << LM3530_EN_PWM_SIMPLE_SHIFT)

/* ALS Config Register Options */
#define LM3530_ALS_AVG_TIME_SHIFT	(0)
#define LM3530_EN_ALS_SHIFT		(3)
#define LM3530_ALS_SEL_SHIFT		(5)

#define LM3530_ENABLE_ALS		(3 << LM3530_EN_ALS_SHIFT)

/* Brightness Ramp Rate Register */
#define LM3530_BRT_RAMP_FALL_SHIFT	(0)
#define LM3530_BRT_RAMP_RISE_SHIFT	(3)

/* ALS Resistor Select */
#define LM3530_ALS1_IMP_SHIFT		(0)
#define LM3530_ALS2_IMP_SHIFT		(4)

/* Zone Boundary Register defaults */
#define LM3530_ALS_ZB_MAX		(4)
#define LM3530_ALS_WINDOW_mV		(1000)
#define LM3530_ALS_OFFSET_mV		(4)

/* Zone Target Register defaults */
#define LM3530_DEF_ZT_0			(0x7F)
#define LM3530_DEF_ZT_1			(0x66)
#define LM3530_DEF_ZT_2			(0x4C)
#define LM3530_DEF_ZT_3			(0x33)
#define LM3530_DEF_ZT_4			(0x19)

/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
#define MAX_BRIGHTNESS			(127)

struct lm3530_mode_map {
	const char *mode;
	enum lm3530_mode mode_val;
};

static struct lm3530_mode_map mode_map[] = {
	{ "man", LM3530_BL_MODE_MANUAL },
	{ "als", LM3530_BL_MODE_ALS },
	{ "pwm", LM3530_BL_MODE_PWM },
};

/**
 * struct lm3530_data
 * @led_dev: led class device
 * @client: i2c client
 * @pdata: LM3530 platform data
 * @mode: mode of operation - manual, ALS, PWM
 * @regulator: regulator
 * @brighness: previous brightness value
 * @enable: regulator is enabled
 */
struct lm3530_data {
	struct led_classdev led_dev;
	struct i2c_client *client;
	struct lm3530_platform_data *pdata;
	enum lm3530_mode mode;
	struct regulator *regulator;
	enum led_brightness brightness;
	bool enable;
};

/*
 * struct lm3530_als_data
 * @config  : value of ALS configuration register
 * @imp_sel : value of ALS resistor select register
 * @zone    : values of ALS ZB(Zone Boundary) registers
 */
struct lm3530_als_data {
	u8 config;
	u8 imp_sel;
	u8 zones[LM3530_ALS_ZB_MAX];
};

static const u8 lm3530_reg[LM3530_REG_MAX] = {
	LM3530_GEN_CONFIG,
	LM3530_ALS_CONFIG,
	LM3530_BRT_RAMP_RATE,
	LM3530_ALS_IMP_SELECT,
	LM3530_BRT_CTRL_REG,
	LM3530_ALS_ZB0_REG,
	LM3530_ALS_ZB1_REG,
	LM3530_ALS_ZB2_REG,
	LM3530_ALS_ZB3_REG,
	LM3530_ALS_Z0T_REG,
	LM3530_ALS_Z1T_REG,
	LM3530_ALS_Z2T_REG,
	LM3530_ALS_Z3T_REG,
	LM3530_ALS_Z4T_REG,
};

static int lm3530_get_mode_from_str(const char *str)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
		if (sysfs_streq(str, mode_map[i].mode))
			return mode_map[i].mode_val;

	return -EINVAL;
}

static void lm3530_als_configure(struct lm3530_platform_data *pdata,
				struct lm3530_als_data *als)
{
	int i;
	u32 als_vmin, als_vmax, als_vstep;

	if (pdata->als_vmax == 0) {
		pdata->als_vmin = 0;
		pdata->als_vmax = LM3530_ALS_WINDOW_mV;
	}

	als_vmin = pdata->als_vmin;
	als_vmax = pdata->als_vmax;

	if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
		pdata->als_vmax = als_vmax = als_vmin + LM3530_ALS_WINDOW_mV;

	/* n zone boundary makes n+1 zones */
	als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);

	for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
		als->zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
			als_vstep + (i * als_vstep)) * LED_FULL) / 1000;

	als->config =
		(pdata->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
		(LM3530_ENABLE_ALS) |
		(pdata->als_input_mode << LM3530_ALS_SEL_SHIFT);

	als->imp_sel =
		(pdata->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
		(pdata->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
}

static int lm3530_init_registers(struct lm3530_data *drvdata)
{
	int ret = 0;
	int i;
	u8 gen_config;
	u8 brt_ramp;
	u8 brightness;
	u8 reg_val[LM3530_REG_MAX];
	struct lm3530_platform_data *pdata = drvdata->pdata;
	struct i2c_client *client = drvdata->client;
	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
	struct lm3530_als_data als;

	memset(&als, 0, sizeof(struct lm3530_als_data));

	gen_config = (pdata->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
			((pdata->max_current & 7) << LM3530_MAX_CURR_SHIFT);

	switch (drvdata->mode) {
	case LM3530_BL_MODE_MANUAL:
		gen_config |= LM3530_ENABLE_I2C;
		break;
	case LM3530_BL_MODE_ALS:
		gen_config |= LM3530_ENABLE_I2C;
		lm3530_als_configure(pdata, &als);
		break;
	case LM3530_BL_MODE_PWM:
		gen_config |= LM3530_ENABLE_PWM | LM3530_ENABLE_PWM_SIMPLE |
			      (pdata->pwm_pol_hi << LM3530_PWM_POL_SHIFT);
		break;
	}

	brt_ramp = (pdata->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
			(pdata->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);

	if (drvdata->brightness)
		brightness = drvdata->brightness;
	else
		brightness = drvdata->brightness = pdata->brt_val;

	if (brightness > drvdata->led_dev.max_brightness)
		brightness = drvdata->led_dev.max_brightness;

	reg_val[0] = gen_config;	/* LM3530_GEN_CONFIG */
	reg_val[1] = als.config;	/* LM3530_ALS_CONFIG */
	reg_val[2] = brt_ramp;		/* LM3530_BRT_RAMP_RATE */
	reg_val[3] = als.imp_sel;	/* LM3530_ALS_IMP_SELECT */
	reg_val[4] = brightness;	/* LM3530_BRT_CTRL_REG */
	reg_val[5] = als.zones[0];	/* LM3530_ALS_ZB0_REG */
	reg_val[6] = als.zones[1];	/* LM3530_ALS_ZB1_REG */
	reg_val[7] = als.zones[2];	/* LM3530_ALS_ZB2_REG */
	reg_val[8] = als.zones[3];	/* LM3530_ALS_ZB3_REG */
	reg_val[9] = LM3530_DEF_ZT_0;	/* LM3530_ALS_Z0T_REG */
	reg_val[10] = LM3530_DEF_ZT_1;	/* LM3530_ALS_Z1T_REG */
	reg_val[11] = LM3530_DEF_ZT_2;	/* LM3530_ALS_Z2T_REG */
	reg_val[12] = LM3530_DEF_ZT_3;	/* LM3530_ALS_Z3T_REG */
	reg_val[13] = LM3530_DEF_ZT_4;	/* LM3530_ALS_Z4T_REG */

	if (!drvdata->enable) {
		ret = regulator_enable(drvdata->regulator);
		if (ret) {
			dev_err(&drvdata->client->dev,
					"Enable regulator failed\n");
			return ret;
		}
		drvdata->enable = true;
	}

	for (i = 0; i < LM3530_REG_MAX; i++) {
		/* do not update brightness register when pwm mode */
		if (lm3530_reg[i] == LM3530_BRT_CTRL_REG &&
		    drvdata->mode == LM3530_BL_MODE_PWM) {
			if (pwm->pwm_set_intensity)
				pwm->pwm_set_intensity(reg_val[i],
					drvdata->led_dev.max_brightness);
			continue;
		}

		ret = i2c_smbus_write_byte_data(client,
				lm3530_reg[i], reg_val[i]);
		if (ret)
			break;
	}

	return ret;
}

static void lm3530_brightness_set(struct led_classdev *led_cdev,
				     enum led_brightness brt_val)
{
	int err;
	struct lm3530_data *drvdata =
	    container_of(led_cdev, struct lm3530_data, led_dev);
	struct lm3530_platform_data *pdata = drvdata->pdata;
	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
	u8 max_brightness = led_cdev->max_brightness;

	switch (drvdata->mode) {
	case LM3530_BL_MODE_MANUAL:

		if (!drvdata->enable) {
			err = lm3530_init_registers(drvdata);
			if (err) {
				dev_err(&drvdata->client->dev,
					"Register Init failed: %d\n", err);
				break;
			}
		}

		/* set the brightness in brightness control register*/
		err = i2c_smbus_write_byte_data(drvdata->client,
				LM3530_BRT_CTRL_REG, brt_val);
		if (err)
			dev_err(&drvdata->client->dev,
				"Unable to set brightness: %d\n", err);
		else
			drvdata->brightness = brt_val;

		if (brt_val == 0) {
			err = regulator_disable(drvdata->regulator);
			if (err)
				dev_err(&drvdata->client->dev,
					"Disable regulator failed\n");
			drvdata->enable = false;
		}
		break;
	case LM3530_BL_MODE_ALS:
		break;
	case LM3530_BL_MODE_PWM:
		if (pwm->pwm_set_intensity)
			pwm->pwm_set_intensity(brt_val, max_brightness);
		break;
	default:
		break;
	}
}

static ssize_t lm3530_mode_get(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3530_data *drvdata;
	int i, len = 0;

	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
		if (drvdata->mode == mode_map[i].mode_val)
			len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
		else
			len += sprintf(buf + len, "%s ", mode_map[i].mode);

	len += sprintf(buf + len, "\n");

	return len;
}

static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
				   *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3530_data *drvdata;
	struct lm3530_pwm_data *pwm;
	u8 max_brightness;
	int mode, err;

	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
	pwm = &drvdata->pdata->pwm_data;
	max_brightness = led_cdev->max_brightness;
	mode = lm3530_get_mode_from_str(buf);
	if (mode < 0) {
		dev_err(dev, "Invalid mode\n");
		return mode;
	}

	drvdata->mode = mode;

	/* set pwm to low if unnecessary */
	if (mode != LM3530_BL_MODE_PWM && pwm->pwm_set_intensity)
		pwm->pwm_set_intensity(0, max_brightness);

	err = lm3530_init_registers(drvdata);
	if (err) {
		dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
		return err;
	}

	return sizeof(drvdata->mode);
}
static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);

static int lm3530_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct lm3530_platform_data *pdata = client->dev.platform_data;
	struct lm3530_data *drvdata;
	int err = 0;

	if (pdata == NULL) {
		dev_err(&client->dev, "platform data required\n");
		return -ENODEV;
	}

	/* BL mode */
	if (pdata->mode > LM3530_BL_MODE_PWM) {
		dev_err(&client->dev, "Illegal Mode request\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
		return -EIO;
	}

	drvdata = devm_kzalloc(&client->dev, sizeof(struct lm3530_data),
				GFP_KERNEL);
	if (drvdata == NULL)
		return -ENOMEM;

	drvdata->mode = pdata->mode;
	drvdata->client = client;
	drvdata->pdata = pdata;
	drvdata->brightness = LED_OFF;
	drvdata->enable = false;
	drvdata->led_dev.name = LM3530_LED_DEV;
	drvdata->led_dev.brightness_set = lm3530_brightness_set;
	drvdata->led_dev.max_brightness = MAX_BRIGHTNESS;

	i2c_set_clientdata(client, drvdata);

	drvdata->regulator = devm_regulator_get(&client->dev, "vin");
	if (IS_ERR(drvdata->regulator)) {
		dev_err(&client->dev, "regulator get failed\n");
		err = PTR_ERR(drvdata->regulator);
		drvdata->regulator = NULL;
		return err;
	}

	if (drvdata->pdata->brt_val) {
		err = lm3530_init_registers(drvdata);
		if (err < 0) {
			dev_err(&client->dev,
				"Register Init failed: %d\n", err);
			return err;
		}
	}
	err = led_classdev_register(&client->dev, &drvdata->led_dev);
	if (err < 0) {
		dev_err(&client->dev, "Register led class failed: %d\n", err);
		return err;
	}

	err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode);
	if (err < 0) {
		dev_err(&client->dev, "File device creation failed: %d\n", err);
		err = -ENODEV;
		goto err_create_file;
	}

	return 0;

err_create_file:
	led_classdev_unregister(&drvdata->led_dev);
	return err;
}

static int lm3530_remove(struct i2c_client *client)
{
	struct lm3530_data *drvdata = i2c_get_clientdata(client);

	device_remove_file(drvdata->led_dev.dev, &dev_attr_mode);

	if (drvdata->enable)
		regulator_disable(drvdata->regulator);
	led_classdev_unregister(&drvdata->led_dev);
	return 0;
}

static const struct i2c_device_id lm3530_id[] = {
	{LM3530_NAME, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, lm3530_id);

static struct i2c_driver lm3530_i2c_driver = {
	.probe = lm3530_probe,
	.remove = lm3530_remove,
	.id_table = lm3530_id,
	.driver = {
		.name = LM3530_NAME,
		.owner = THIS_MODULE,
	},
};

module_i2c_driver(lm3530_i2c_driver);

MODULE_DESCRIPTION("Back Light driver for LM3530");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Shreshtha Kumar SAHU <[email protected]>");
Commit	Line	Data
b1e6b706 SKS	1	/*
	2	* Copyright (C) 2011 ST-Ericsson SA.
	3	* Copyright (C) 2009 Motorola, Inc.
	4	*
	5	* License Terms: GNU General Public License v2
	6	*
	7	* Simple driver for National Semiconductor LM3530 Backlight driver chip
	8	*
	9	* Author: Shreshtha Kumar SAHU <[email protected]>
	10	* based on leds-lm3530.c by Dan Murphy <[email protected]>
	11	*/
	12
	13	#include <linux/i2c.h>
	14	#include <linux/leds.h>
	15	#include <linux/slab.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/input.h>
	18	#include <linux/led-lm3530.h>
	19	#include <linux/types.h>
9b2da53f	20	#include <linux/regulator/consumer.h>
54f4dedb	21	#include <linux/module.h>
b1e6b706 SKS	22
	23	#define LM3530_LED_DEV "lcd-backlight"
	24	#define LM3530_NAME "lm3530-led"
	25
	26	#define LM3530_GEN_CONFIG 0x10
	27	#define LM3530_ALS_CONFIG 0x20
	28	#define LM3530_BRT_RAMP_RATE 0x30
b1e6b706 SKS	29	#define LM3530_ALS_IMP_SELECT 0x41
	30	#define LM3530_BRT_CTRL_REG 0xA0
	31	#define LM3530_ALS_ZB0_REG 0x60
	32	#define LM3530_ALS_ZB1_REG 0x61
	33	#define LM3530_ALS_ZB2_REG 0x62
	34	#define LM3530_ALS_ZB3_REG 0x63
	35	#define LM3530_ALS_Z0T_REG 0x70
	36	#define LM3530_ALS_Z1T_REG 0x71
	37	#define LM3530_ALS_Z2T_REG 0x72
	38	#define LM3530_ALS_Z3T_REG 0x73
	39	#define LM3530_ALS_Z4T_REG 0x74
8544d0e3	40	#define LM3530_REG_MAX 14
b1e6b706 SKS	41
	42	/* General Control Register */
	43	#define LM3530_EN_I2C_SHIFT (0)
	44	#define LM3530_RAMP_LAW_SHIFT (1)
	45	#define LM3530_MAX_CURR_SHIFT (2)
	46	#define LM3530_EN_PWM_SHIFT (5)
	47	#define LM3530_PWM_POL_SHIFT (6)
	48	#define LM3530_EN_PWM_SIMPLE_SHIFT (7)
	49
	50	#define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT)
	51	#define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT)
	52	#define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT)
	53	#define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT)
	54
	55	/* ALS Config Register Options */
	56	#define LM3530_ALS_AVG_TIME_SHIFT (0)
	57	#define LM3530_EN_ALS_SHIFT (3)
	58	#define LM3530_ALS_SEL_SHIFT (5)
	59
	60	#define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT)
	61
	62	/* Brightness Ramp Rate Register */
	63	#define LM3530_BRT_RAMP_FALL_SHIFT (0)
	64	#define LM3530_BRT_RAMP_RISE_SHIFT (3)
	65
	66	/* ALS Resistor Select */
	67	#define LM3530_ALS1_IMP_SHIFT (0)
	68	#define LM3530_ALS2_IMP_SHIFT (4)
	69
	70	/* Zone Boundary Register defaults */
40b1445b SKS	71	#define LM3530_ALS_ZB_MAX (4)
	72	#define LM3530_ALS_WINDOW_mV (1000)
	73	#define LM3530_ALS_OFFSET_mV (4)
b1e6b706 SKS	74
b1e6b706 SKS	75	/* Zone Target Register defaults */
40b1445b SKS	76	#define LM3530_DEF_ZT_0 (0x7F)
40b1445b SKS	77	#define LM3530_DEF_ZT_1 (0x66)
b1e6b706	78	#define LM3530_DEF_ZT_2 (0x4C)
40b1445b SKS	79	#define LM3530_DEF_ZT_3 (0x33)
40b1445b SKS	80	#define LM3530_DEF_ZT_4 (0x19)
b1e6b706	81
bbe64532 KM	82	/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
	83	#define MAX_BRIGHTNESS (127)
	84
b1e6b706 SKS	85	struct lm3530_mode_map {
	86	const char *mode;
	87	enum lm3530_mode mode_val;
	88	};
	89
	90	static struct lm3530_mode_map mode_map[] = {
	91	{ "man", LM3530_BL_MODE_MANUAL },
	92	{ "als", LM3530_BL_MODE_ALS },
	93	{ "pwm", LM3530_BL_MODE_PWM },
	94	};
	95
	96	/**
	97	* struct lm3530_data
	98	* @led_dev: led class device
	99	* @client: i2c client
	100	* @pdata: LM3530 platform data
	101	* @mode: mode of operation - manual, ALS, PWM
9b2da53f SKS	102	* @regulator: regulator
	103	* @brighness: previous brightness value
	104	* @enable: regulator is enabled
b1e6b706 SKS	105	*/
	106	struct lm3530_data {
	107	struct led_classdev led_dev;
	108	struct i2c_client *client;
	109	struct lm3530_platform_data *pdata;
	110	enum lm3530_mode mode;
9b2da53f SKS	111	struct regulator *regulator;
	112	enum led_brightness brightness;
	113	bool enable;
b1e6b706 SKS	114	};
b1e6b706 SKS	115
6335f8fa KM	116	/*
	117	* struct lm3530_als_data
	118	* @config : value of ALS configuration register
	119	* @imp_sel : value of ALS resistor select register
	120	* @zone : values of ALS ZB(Zone Boundary) registers
	121	*/
	122	struct lm3530_als_data {
	123	u8 config;
	124	u8 imp_sel;
	125	u8 zones[LM3530_ALS_ZB_MAX];
	126	};
	127
b1e6b706 SKS	128	static const u8 lm3530_reg[LM3530_REG_MAX] = {
	129	LM3530_GEN_CONFIG,
	130	LM3530_ALS_CONFIG,
	131	LM3530_BRT_RAMP_RATE,
b1e6b706 SKS	132	LM3530_ALS_IMP_SELECT,
	133	LM3530_BRT_CTRL_REG,
	134	LM3530_ALS_ZB0_REG,
	135	LM3530_ALS_ZB1_REG,
	136	LM3530_ALS_ZB2_REG,
	137	LM3530_ALS_ZB3_REG,
	138	LM3530_ALS_Z0T_REG,
	139	LM3530_ALS_Z1T_REG,
	140	LM3530_ALS_Z2T_REG,
	141	LM3530_ALS_Z3T_REG,
	142	LM3530_ALS_Z4T_REG,
	143	};
	144
	145	static int lm3530_get_mode_from_str(const char *str)
	146	{
	147	int i;
	148
	149	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
	150	if (sysfs_streq(str, mode_map[i].mode))
	151	return mode_map[i].mode_val;
	152
e0e02160	153	return -EINVAL;
b1e6b706 SKS	154	}
b1e6b706 SKS	155
6335f8fa KM	156	static void lm3530_als_configure(struct lm3530_platform_data *pdata,
	157	struct lm3530_als_data *als)
	158	{
	159	int i;
	160	u32 als_vmin, als_vmax, als_vstep;
	161
	162	if (pdata->als_vmax == 0) {
	163	pdata->als_vmin = 0;
	164	pdata->als_vmax = LM3530_ALS_WINDOW_mV;
	165	}
	166
	167	als_vmin = pdata->als_vmin;
	168	als_vmax = pdata->als_vmax;
	169
	170	if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
	171	pdata->als_vmax = als_vmax = als_vmin + LM3530_ALS_WINDOW_mV;
	172
	173	/* n zone boundary makes n+1 zones */
	174	als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
	175
	176	for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
	177	als->zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
	178	als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
	179
	180	als->config =
	181	(pdata->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) \|
	182	(LM3530_ENABLE_ALS) \|
	183	(pdata->als_input_mode << LM3530_ALS_SEL_SHIFT);
	184
	185	als->imp_sel =
	186	(pdata->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) \|
	187	(pdata->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
	188	}
	189
b1e6b706 SKS	190	static int lm3530_init_registers(struct lm3530_data *drvdata)
	191	{
	192	int ret = 0;
	193	int i;
	194	u8 gen_config;
b1e6b706	195	u8 brt_ramp;
b1e6b706 SKS	196	u8 brightness;
b1e6b706 SKS	197	u8 reg_val[LM3530_REG_MAX];
99ad98d2	198	struct lm3530_platform_data *pdata = drvdata->pdata;
b1e6b706	199	struct i2c_client *client = drvdata->client;
99ad98d2	200	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
6335f8fa KM	201	struct lm3530_als_data als;
	202
	203	memset(&als, 0, sizeof(struct lm3530_als_data));
b1e6b706	204
99ad98d2 KM	205	gen_config = (pdata->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) \|
99ad98d2 KM	206	((pdata->max_current & 7) << LM3530_MAX_CURR_SHIFT);
b1e6b706	207
cea694ca AL	208	switch (drvdata->mode) {
cea694ca AL	209	case LM3530_BL_MODE_MANUAL:
6335f8fa KM	210	gen_config \|= LM3530_ENABLE_I2C;
6335f8fa KM	211	break;
cea694ca AL	212	case LM3530_BL_MODE_ALS:
cea694ca AL	213	gen_config \|= LM3530_ENABLE_I2C;
6335f8fa	214	lm3530_als_configure(pdata, &als);
cea694ca AL	215	break;
	216	case LM3530_BL_MODE_PWM:
	217	gen_config \|= LM3530_ENABLE_PWM \| LM3530_ENABLE_PWM_SIMPLE \|
	218	(pdata->pwm_pol_hi << LM3530_PWM_POL_SHIFT);
	219	break;
	220	}
b1e6b706	221
99ad98d2 KM	222	brt_ramp = (pdata->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) \|
99ad98d2 KM	223	(pdata->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
b1e6b706	224
9b2da53f SKS	225	if (drvdata->brightness)
	226	brightness = drvdata->brightness;
	227	else
99ad98d2	228	brightness = drvdata->brightness = pdata->brt_val;
b1e6b706	229
bbe64532 KM	230	if (brightness > drvdata->led_dev.max_brightness)
	231	brightness = drvdata->led_dev.max_brightness;
	232
b1e6b706	233	reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
6335f8fa	234	reg_val[1] = als.config; /* LM3530_ALS_CONFIG */
b1e6b706	235	reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
6335f8fa	236	reg_val[3] = als.imp_sel; /* LM3530_ALS_IMP_SELECT */
8544d0e3	237	reg_val[4] = brightness; /* LM3530_BRT_CTRL_REG */
6335f8fa KM	238	reg_val[5] = als.zones[0]; /* LM3530_ALS_ZB0_REG */
	239	reg_val[6] = als.zones[1]; /* LM3530_ALS_ZB1_REG */
	240	reg_val[7] = als.zones[2]; /* LM3530_ALS_ZB2_REG */
	241	reg_val[8] = als.zones[3]; /* LM3530_ALS_ZB3_REG */
8544d0e3 KM	242	reg_val[9] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
	243	reg_val[10] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
	244	reg_val[11] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
	245	reg_val[12] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
	246	reg_val[13] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
b1e6b706	247
9b2da53f SKS	248	if (!drvdata->enable) {
	249	ret = regulator_enable(drvdata->regulator);
	250	if (ret) {
	251	dev_err(&drvdata->client->dev,
	252	"Enable regulator failed\n");
	253	return ret;
	254	}
	255	drvdata->enable = true;
	256	}
	257
b1e6b706	258	for (i = 0; i < LM3530_REG_MAX; i++) {
bb982009 KM	259	/* do not update brightness register when pwm mode */
	260	if (lm3530_reg[i] == LM3530_BRT_CTRL_REG &&
	261	drvdata->mode == LM3530_BL_MODE_PWM) {
	262	if (pwm->pwm_set_intensity)
	263	pwm->pwm_set_intensity(reg_val[i],
	264	drvdata->led_dev.max_brightness);
	265	continue;
	266	}
	267
b1e6b706 SKS	268	ret = i2c_smbus_write_byte_data(client,
	269	lm3530_reg[i], reg_val[i]);
	270	if (ret)
	271	break;
	272	}
	273
	274	return ret;
	275	}
	276
	277	static void lm3530_brightness_set(struct led_classdev *led_cdev,
	278	enum led_brightness brt_val)
	279	{
	280	int err;
	281	struct lm3530_data *drvdata =
	282	container_of(led_cdev, struct lm3530_data, led_dev);
bb982009 KM	283	struct lm3530_platform_data *pdata = drvdata->pdata;
	284	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
	285	u8 max_brightness = led_cdev->max_brightness;
b1e6b706 SKS	286
	287	switch (drvdata->mode) {
	288	case LM3530_BL_MODE_MANUAL:
	289
9b2da53f SKS	290	if (!drvdata->enable) {
	291	err = lm3530_init_registers(drvdata);
	292	if (err) {
	293	dev_err(&drvdata->client->dev,
	294	"Register Init failed: %d\n", err);
	295	break;
	296	}
	297	}
	298
b1e6b706 SKS	299	/* set the brightness in brightness control register*/
b1e6b706 SKS	300	err = i2c_smbus_write_byte_data(drvdata->client,
bbe64532	301	LM3530_BRT_CTRL_REG, brt_val);
b1e6b706 SKS	302	if (err)
	303	dev_err(&drvdata->client->dev,
	304	"Unable to set brightness: %d\n", err);
9b2da53f	305	else
bbe64532	306	drvdata->brightness = brt_val;
9b2da53f SKS	307
	308	if (brt_val == 0) {
	309	err = regulator_disable(drvdata->regulator);
	310	if (err)
	311	dev_err(&drvdata->client->dev,
	312	"Disable regulator failed\n");
	313	drvdata->enable = false;
	314	}
b1e6b706 SKS	315	break;
	316	case LM3530_BL_MODE_ALS:
	317	break;
	318	case LM3530_BL_MODE_PWM:
bb982009 KM	319	if (pwm->pwm_set_intensity)
bb982009 KM	320	pwm->pwm_set_intensity(brt_val, max_brightness);
b1e6b706 SKS	321	break;
	322	default:
	323	break;
	324	}
	325	}
	326
40b1445b SKS	327	static ssize_t lm3530_mode_get(struct device *dev,
	328	struct device_attribute attr, char buf)
	329	{
e13d9786 KM	330	struct led_classdev *led_cdev = dev_get_drvdata(dev);
e13d9786 KM	331	struct lm3530_data *drvdata;
40b1445b SKS	332	int i, len = 0;
40b1445b SKS	333
e13d9786	334	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
40b1445b SKS	335	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
	336	if (drvdata->mode == mode_map[i].mode_val)
	337	len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
	338	else
	339	len += sprintf(buf + len, "%s ", mode_map[i].mode);
	340
	341	len += sprintf(buf + len, "\n");
	342
	343	return len;
	344	}
b1e6b706 SKS	345
	346	static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
	347	attr, const char buf, size_t size)
	348	{
e13d9786 KM	349	struct led_classdev *led_cdev = dev_get_drvdata(dev);
e13d9786 KM	350	struct lm3530_data *drvdata;
bb982009 KM	351	struct lm3530_pwm_data *pwm;
bb982009 KM	352	u8 max_brightness;
e13d9786	353	int mode, err;
b1e6b706	354
e13d9786	355	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
bb982009 KM	356	pwm = &drvdata->pdata->pwm_data;
bb982009 KM	357	max_brightness = led_cdev->max_brightness;
b1e6b706 SKS	358	mode = lm3530_get_mode_from_str(buf);
	359	if (mode < 0) {
	360	dev_err(dev, "Invalid mode\n");
e0e02160	361	return mode;
b1e6b706 SKS	362	}
b1e6b706 SKS	363
bb982009 KM	364	drvdata->mode = mode;
	365
	366	/* set pwm to low if unnecessary */
	367	if (mode != LM3530_BL_MODE_PWM && pwm->pwm_set_intensity)
	368	pwm->pwm_set_intensity(0, max_brightness);
b1e6b706 SKS	369
	370	err = lm3530_init_registers(drvdata);
	371	if (err) {
	372	dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
	373	return err;
	374	}
	375
	376	return sizeof(drvdata->mode);
	377	}
40b1445b	378	static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);
b1e6b706	379
98ea1ea2	380	static int lm3530_probe(struct i2c_client *client,
b1e6b706 SKS	381	const struct i2c_device_id *id)
	382	{
	383	struct lm3530_platform_data *pdata = client->dev.platform_data;
	384	struct lm3530_data *drvdata;
	385	int err = 0;
	386
	387	if (pdata == NULL) {
	388	dev_err(&client->dev, "platform data required\n");
0b873f3d	389	return -ENODEV;
b1e6b706 SKS	390	}
	391
	392	/* BL mode */
	393	if (pdata->mode > LM3530_BL_MODE_PWM) {
	394	dev_err(&client->dev, "Illegal Mode request\n");
0b873f3d	395	return -EINVAL;
b1e6b706 SKS	396	}
	397
	398	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	399	dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
0b873f3d	400	return -EIO;
b1e6b706 SKS	401	}
b1e6b706 SKS	402
0b873f3d BW	403	drvdata = devm_kzalloc(&client->dev, sizeof(struct lm3530_data),
	404	GFP_KERNEL);
	405	if (drvdata == NULL)
	406	return -ENOMEM;
b1e6b706 SKS	407
	408	drvdata->mode = pdata->mode;
	409	drvdata->client = client;
	410	drvdata->pdata = pdata;
9b2da53f SKS	411	drvdata->brightness = LED_OFF;
9b2da53f SKS	412	drvdata->enable = false;
b1e6b706 SKS	413	drvdata->led_dev.name = LM3530_LED_DEV;
b1e6b706 SKS	414	drvdata->led_dev.brightness_set = lm3530_brightness_set;
bbe64532	415	drvdata->led_dev.max_brightness = MAX_BRIGHTNESS;
b1e6b706 SKS	416
	417	i2c_set_clientdata(client, drvdata);
	418
a47df97c	419	drvdata->regulator = devm_regulator_get(&client->dev, "vin");
9b2da53f SKS	420	if (IS_ERR(drvdata->regulator)) {
	421	dev_err(&client->dev, "regulator get failed\n");
	422	err = PTR_ERR(drvdata->regulator);
	423	drvdata->regulator = NULL;
0b873f3d	424	return err;
b1e6b706 SKS	425	}
b1e6b706 SKS	426
9b2da53f SKS	427	if (drvdata->pdata->brt_val) {
	428	err = lm3530_init_registers(drvdata);
	429	if (err < 0) {
	430	dev_err(&client->dev,
	431	"Register Init failed: %d\n", err);
e0e02160	432	return err;
9b2da53f SKS	433	}
	434	}
	435	err = led_classdev_register(&client->dev, &drvdata->led_dev);
b1e6b706 SKS	436	if (err < 0) {
b1e6b706 SKS	437	dev_err(&client->dev, "Register led class failed: %d\n", err);
e0e02160	438	return err;
b1e6b706 SKS	439	}
	440
	441	err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode);
	442	if (err < 0) {
	443	dev_err(&client->dev, "File device creation failed: %d\n", err);
	444	err = -ENODEV;
	445	goto err_create_file;
	446	}
	447
	448	return 0;
	449
	450	err_create_file:
	451	led_classdev_unregister(&drvdata->led_dev);
b1e6b706 SKS	452	return err;
	453	}
	454
678e8a6b	455	static int lm3530_remove(struct i2c_client *client)
b1e6b706 SKS	456	{
	457	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	458
	459	device_remove_file(drvdata->led_dev.dev, &dev_attr_mode);
9b2da53f SKS	460
	461	if (drvdata->enable)
	462	regulator_disable(drvdata->regulator);
b1e6b706	463	led_classdev_unregister(&drvdata->led_dev);
b1e6b706 SKS	464	return 0;
	465	}
	466
	467	static const struct i2c_device_id lm3530_id[] = {
	468	{LM3530_NAME, 0},
	469	{}
	470	};
d5f33d45	471	MODULE_DEVICE_TABLE(i2c, lm3530_id);
b1e6b706 SKS	472
	473	static struct i2c_driver lm3530_i2c_driver = {
	474	.probe = lm3530_probe,
df07cf81	475	.remove = lm3530_remove,
b1e6b706 SKS	476	.id_table = lm3530_id,
	477	.driver = {
	478	.name = LM3530_NAME,
	479	.owner = THIS_MODULE,
	480	},
	481	};
	482
09a0d183	483	module_i2c_driver(lm3530_i2c_driver);
b1e6b706 SKS	484
	485	MODULE_DESCRIPTION("Back Light driver for LM3530");
	486	MODULE_LICENSE("GPL v2");
	487	MODULE_AUTHOR("Shreshtha Kumar SAHU <[email protected]>");