[deliverable/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 <shreshthakumar.sahu@stericsson.com>
 * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
 */

#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_ZONE_REG		0x40
#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			15

/* 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;
};

static const u8 lm3530_reg[LM3530_REG_MAX] = {
	LM3530_GEN_CONFIG,
	LM3530_ALS_CONFIG,
	LM3530_BRT_RAMP_RATE,
	LM3530_ALS_ZONE_REG,
	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 -1;
}

static int lm3530_init_registers(struct lm3530_data *drvdata)
{
	int ret = 0;
	int i;
	u8 gen_config;
	u8 als_config = 0;
	u8 brt_ramp;
	u8 als_imp_sel = 0;
	u8 brightness;
	u8 reg_val[LM3530_REG_MAX];
	u8 zones[LM3530_ALS_ZB_MAX];
	u32 als_vmin, als_vmax, als_vstep;
	struct lm3530_platform_data *pltfm = drvdata->pdata;
	struct i2c_client *client = drvdata->client;

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

	if (drvdata->mode == LM3530_BL_MODE_MANUAL ||
	    drvdata->mode == LM3530_BL_MODE_ALS)
		gen_config |= (LM3530_ENABLE_I2C);

	if (drvdata->mode == LM3530_BL_MODE_ALS) {
		if (pltfm->als_vmax == 0) {
			pltfm->als_vmin = 0;
			pltfm->als_vmax = LM3530_ALS_WINDOW_mV;
		}

		als_vmin = pltfm->als_vmin;
		als_vmax = pltfm->als_vmax;

		if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
			pltfm->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++)
			zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
					als_vstep + (i * als_vstep)) * LED_FULL)
					/ 1000;

		als_config =
			(pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
			(LM3530_ENABLE_ALS) |
			(pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT);

		als_imp_sel =
			(pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
			(pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);

	}

	if (drvdata->mode == LM3530_BL_MODE_PWM)
		gen_config |= (LM3530_ENABLE_PWM) |
				(pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) |
				(LM3530_ENABLE_PWM_SIMPLE);

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

	if (drvdata->brightness)
		brightness = drvdata->brightness;
	else
		brightness = drvdata->brightness = pltfm->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] = 0x00;		/* LM3530_ALS_ZONE_REG */
	reg_val[4] = als_imp_sel;	/* LM3530_ALS_IMP_SELECT */
	reg_val[5] = brightness;	/* LM3530_BRT_CTRL_REG */
	reg_val[6] = zones[0];		/* LM3530_ALS_ZB0_REG */
	reg_val[7] = zones[1];		/* LM3530_ALS_ZB1_REG */
	reg_val[8] = zones[2];		/* LM3530_ALS_ZB2_REG */
	reg_val[9] = zones[3];		/* LM3530_ALS_ZB3_REG */
	reg_val[10] = LM3530_DEF_ZT_0;	/* LM3530_ALS_Z0T_REG */
	reg_val[11] = LM3530_DEF_ZT_1;	/* LM3530_ALS_Z1T_REG */
	reg_val[12] = LM3530_DEF_ZT_2;	/* LM3530_ALS_Z2T_REG */
	reg_val[13] = LM3530_DEF_ZT_3;	/* LM3530_ALS_Z3T_REG */
	reg_val[14] = 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++) {
		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);

	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:
		break;
	default:
		break;
	}
}

static ssize_t lm3530_mode_get(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = container_of(
					dev->parent, struct i2c_client, dev);
	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	int i, len = 0;

	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)
{
	int err;
	struct i2c_client *client = container_of(
					dev->parent, struct i2c_client, dev);
	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	int mode;

	mode = lm3530_get_mode_from_str(buf);
	if (mode < 0) {
		dev_err(dev, "Invalid mode\n");
		return -EINVAL;
	}

	if (mode == LM3530_BL_MODE_MANUAL)
		drvdata->mode = LM3530_BL_MODE_MANUAL;
	else if (mode == LM3530_BL_MODE_ALS)
		drvdata->mode = LM3530_BL_MODE_ALS;
	else if (mode == LM3530_BL_MODE_PWM) {
		dev_err(dev, "PWM mode not supported\n");
		return -EINVAL;
	}

	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 __devinit 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");
		err = -ENODEV;
		goto err_out;
	}

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

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

	drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL);
	if (drvdata == NULL) {
		err = -ENOMEM;
		goto err_out;
	}

	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 = 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;
		goto err_regulator_get;
	}

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

	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);
err_class_register:
err_reg_init:
	regulator_put(drvdata->regulator);
err_regulator_get:
	kfree(drvdata);
err_out:
	return err;
}

static int __devexit 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);
	regulator_put(drvdata->regulator);
	led_classdev_unregister(&drvdata->led_dev);
	kfree(drvdata);
	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 = __devexit_p(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 <shreshthakumar.sahu@stericsson.com>");
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 <shreshthakumar.sahu@stericsson.com>
	10	* based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
	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
	29	#define LM3530_ALS_ZONE_REG 0x40
	30	#define LM3530_ALS_IMP_SELECT 0x41
	31	#define LM3530_BRT_CTRL_REG 0xA0
	32	#define LM3530_ALS_ZB0_REG 0x60
	33	#define LM3530_ALS_ZB1_REG 0x61
	34	#define LM3530_ALS_ZB2_REG 0x62
	35	#define LM3530_ALS_ZB3_REG 0x63
	36	#define LM3530_ALS_Z0T_REG 0x70
	37	#define LM3530_ALS_Z1T_REG 0x71
	38	#define LM3530_ALS_Z2T_REG 0x72
	39	#define LM3530_ALS_Z3T_REG 0x73
	40	#define LM3530_ALS_Z4T_REG 0x74
	41	#define LM3530_REG_MAX 15
	42
	43	/* General Control Register */
	44	#define LM3530_EN_I2C_SHIFT (0)
	45	#define LM3530_RAMP_LAW_SHIFT (1)
	46	#define LM3530_MAX_CURR_SHIFT (2)
	47	#define LM3530_EN_PWM_SHIFT (5)
	48	#define LM3530_PWM_POL_SHIFT (6)
	49	#define LM3530_EN_PWM_SIMPLE_SHIFT (7)
	50
	51	#define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT)
	52	#define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT)
	53	#define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT)
	54	#define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT)
	55
	56	/* ALS Config Register Options */
	57	#define LM3530_ALS_AVG_TIME_SHIFT (0)
	58	#define LM3530_EN_ALS_SHIFT (3)
	59	#define LM3530_ALS_SEL_SHIFT (5)
	60
	61	#define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT)
	62
	63	/* Brightness Ramp Rate Register */
	64	#define LM3530_BRT_RAMP_FALL_SHIFT (0)
	65	#define LM3530_BRT_RAMP_RISE_SHIFT (3)
	66
	67	/* ALS Resistor Select */
	68	#define LM3530_ALS1_IMP_SHIFT (0)
	69	#define LM3530_ALS2_IMP_SHIFT (4)
	70
	71	/* Zone Boundary Register defaults */
40b1445b SKS	72	#define LM3530_ALS_ZB_MAX (4)
	73	#define LM3530_ALS_WINDOW_mV (1000)
	74	#define LM3530_ALS_OFFSET_mV (4)
b1e6b706 SKS	75
b1e6b706 SKS	76	/* Zone Target Register defaults */
40b1445b SKS	77	#define LM3530_DEF_ZT_0 (0x7F)
40b1445b SKS	78	#define LM3530_DEF_ZT_1 (0x66)
b1e6b706	79	#define LM3530_DEF_ZT_2 (0x4C)
40b1445b SKS	80	#define LM3530_DEF_ZT_3 (0x33)
40b1445b SKS	81	#define LM3530_DEF_ZT_4 (0x19)
b1e6b706	82
bbe64532 KM	83	/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
	84	#define MAX_BRIGHTNESS (127)
	85
b1e6b706 SKS	86	struct lm3530_mode_map {
	87	const char *mode;
	88	enum lm3530_mode mode_val;
	89	};
	90
	91	static struct lm3530_mode_map mode_map[] = {
	92	{ "man", LM3530_BL_MODE_MANUAL },
	93	{ "als", LM3530_BL_MODE_ALS },
	94	{ "pwm", LM3530_BL_MODE_PWM },
	95	};
	96
	97	/**
	98	* struct lm3530_data
	99	* @led_dev: led class device
	100	* @client: i2c client
	101	* @pdata: LM3530 platform data
	102	* @mode: mode of operation - manual, ALS, PWM
9b2da53f SKS	103	* @regulator: regulator
	104	* @brighness: previous brightness value
	105	* @enable: regulator is enabled
b1e6b706 SKS	106	*/
	107	struct lm3530_data {
	108	struct led_classdev led_dev;
	109	struct i2c_client *client;
	110	struct lm3530_platform_data *pdata;
	111	enum lm3530_mode mode;
9b2da53f SKS	112	struct regulator *regulator;
	113	enum led_brightness brightness;
	114	bool enable;
b1e6b706 SKS	115	};
	116
	117	static const u8 lm3530_reg[LM3530_REG_MAX] = {
	118	LM3530_GEN_CONFIG,
	119	LM3530_ALS_CONFIG,
	120	LM3530_BRT_RAMP_RATE,
	121	LM3530_ALS_ZONE_REG,
	122	LM3530_ALS_IMP_SELECT,
	123	LM3530_BRT_CTRL_REG,
	124	LM3530_ALS_ZB0_REG,
	125	LM3530_ALS_ZB1_REG,
	126	LM3530_ALS_ZB2_REG,
	127	LM3530_ALS_ZB3_REG,
	128	LM3530_ALS_Z0T_REG,
	129	LM3530_ALS_Z1T_REG,
	130	LM3530_ALS_Z2T_REG,
	131	LM3530_ALS_Z3T_REG,
	132	LM3530_ALS_Z4T_REG,
	133	};
	134
	135	static int lm3530_get_mode_from_str(const char *str)
	136	{
	137	int i;
	138
	139	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
	140	if (sysfs_streq(str, mode_map[i].mode))
	141	return mode_map[i].mode_val;
	142
	143	return -1;
	144	}
	145
	146	static int lm3530_init_registers(struct lm3530_data *drvdata)
	147	{
	148	int ret = 0;
	149	int i;
	150	u8 gen_config;
	151	u8 als_config = 0;
	152	u8 brt_ramp;
	153	u8 als_imp_sel = 0;
	154	u8 brightness;
	155	u8 reg_val[LM3530_REG_MAX];
40b1445b SKS	156	u8 zones[LM3530_ALS_ZB_MAX];
40b1445b SKS	157	u32 als_vmin, als_vmax, als_vstep;
b1e6b706 SKS	158	struct lm3530_platform_data *pltfm = drvdata->pdata;
	159	struct i2c_client *client = drvdata->client;
	160
	161	gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) \|
	162	((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT);
	163
	164	if (drvdata->mode == LM3530_BL_MODE_MANUAL \|\|
	165	drvdata->mode == LM3530_BL_MODE_ALS)
	166	gen_config \|= (LM3530_ENABLE_I2C);
	167
	168	if (drvdata->mode == LM3530_BL_MODE_ALS) {
40b1445b	169	if (pltfm->als_vmax == 0) {
ec44fd42 AL	170	pltfm->als_vmin = 0;
ec44fd42 AL	171	pltfm->als_vmax = LM3530_ALS_WINDOW_mV;
40b1445b SKS	172	}
	173
	174	als_vmin = pltfm->als_vmin;
	175	als_vmax = pltfm->als_vmax;
	176
	177	if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
	178	pltfm->als_vmax = als_vmax =
	179	als_vmin + LM3530_ALS_WINDOW_mV;
	180
	181	/* n zone boundary makes n+1 zones */
	182	als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
	183
	184	for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
	185	zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
	186	als_vstep + (i * als_vstep)) * LED_FULL)
	187	/ 1000;
	188
b1e6b706 SKS	189	als_config =
	190	(pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) \|
	191	(LM3530_ENABLE_ALS) \|
	192	(pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT);
	193
	194	als_imp_sel =
	195	(pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) \|
	196	(pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
40b1445b	197
b1e6b706 SKS	198	}
	199
	200	if (drvdata->mode == LM3530_BL_MODE_PWM)
	201	gen_config \|= (LM3530_ENABLE_PWM) \|
	202	(pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) \|
	203	(LM3530_ENABLE_PWM_SIMPLE);
	204
	205	brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) \|
	206	(pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
	207
9b2da53f SKS	208	if (drvdata->brightness)
	209	brightness = drvdata->brightness;
	210	else
	211	brightness = drvdata->brightness = pltfm->brt_val;
b1e6b706	212
bbe64532 KM	213	if (brightness > drvdata->led_dev.max_brightness)
	214	brightness = drvdata->led_dev.max_brightness;
	215
b1e6b706 SKS	216	reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
	217	reg_val[1] = als_config; /* LM3530_ALS_CONFIG */
	218	reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
	219	reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */
	220	reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */
	221	reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */
40b1445b SKS	222	reg_val[6] = zones[0]; /* LM3530_ALS_ZB0_REG */
	223	reg_val[7] = zones[1]; /* LM3530_ALS_ZB1_REG */
	224	reg_val[8] = zones[2]; /* LM3530_ALS_ZB2_REG */
	225	reg_val[9] = zones[3]; /* LM3530_ALS_ZB3_REG */
b1e6b706 SKS	226	reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
	227	reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
	228	reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
	229	reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
	230	reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
	231
9b2da53f SKS	232	if (!drvdata->enable) {
	233	ret = regulator_enable(drvdata->regulator);
	234	if (ret) {
	235	dev_err(&drvdata->client->dev,
	236	"Enable regulator failed\n");
	237	return ret;
	238	}
	239	drvdata->enable = true;
	240	}
	241
b1e6b706 SKS	242	for (i = 0; i < LM3530_REG_MAX; i++) {
	243	ret = i2c_smbus_write_byte_data(client,
	244	lm3530_reg[i], reg_val[i]);
	245	if (ret)
	246	break;
	247	}
	248
	249	return ret;
	250	}
	251
	252	static void lm3530_brightness_set(struct led_classdev *led_cdev,
	253	enum led_brightness brt_val)
	254	{
	255	int err;
	256	struct lm3530_data *drvdata =
	257	container_of(led_cdev, struct lm3530_data, led_dev);
	258
	259	switch (drvdata->mode) {
	260	case LM3530_BL_MODE_MANUAL:
	261
9b2da53f SKS	262	if (!drvdata->enable) {
	263	err = lm3530_init_registers(drvdata);
	264	if (err) {
	265	dev_err(&drvdata->client->dev,
	266	"Register Init failed: %d\n", err);
	267	break;
	268	}
	269	}
	270
b1e6b706 SKS	271	/* set the brightness in brightness control register*/
b1e6b706 SKS	272	err = i2c_smbus_write_byte_data(drvdata->client,
bbe64532	273	LM3530_BRT_CTRL_REG, brt_val);
b1e6b706 SKS	274	if (err)
	275	dev_err(&drvdata->client->dev,
	276	"Unable to set brightness: %d\n", err);
9b2da53f	277	else
bbe64532	278	drvdata->brightness = brt_val;
9b2da53f SKS	279
	280	if (brt_val == 0) {
	281	err = regulator_disable(drvdata->regulator);
	282	if (err)
	283	dev_err(&drvdata->client->dev,
	284	"Disable regulator failed\n");
	285	drvdata->enable = false;
	286	}
b1e6b706 SKS	287	break;
	288	case LM3530_BL_MODE_ALS:
	289	break;
	290	case LM3530_BL_MODE_PWM:
	291	break;
	292	default:
	293	break;
	294	}
	295	}
	296
40b1445b SKS	297	static ssize_t lm3530_mode_get(struct device *dev,
	298	struct device_attribute attr, char buf)
	299	{
	300	struct i2c_client *client = container_of(
	301	dev->parent, struct i2c_client, dev);
	302	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	303	int i, len = 0;
	304
	305	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
	306	if (drvdata->mode == mode_map[i].mode_val)
	307	len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
	308	else
	309	len += sprintf(buf + len, "%s ", mode_map[i].mode);
	310
	311	len += sprintf(buf + len, "\n");
	312
	313	return len;
	314	}
b1e6b706 SKS	315
	316	static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
	317	attr, const char buf, size_t size)
	318	{
	319	int err;
	320	struct i2c_client *client = container_of(
	321	dev->parent, struct i2c_client, dev);
	322	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	323	int mode;
	324
	325	mode = lm3530_get_mode_from_str(buf);
	326	if (mode < 0) {
	327	dev_err(dev, "Invalid mode\n");
	328	return -EINVAL;
	329	}
	330
	331	if (mode == LM3530_BL_MODE_MANUAL)
	332	drvdata->mode = LM3530_BL_MODE_MANUAL;
	333	else if (mode == LM3530_BL_MODE_ALS)
	334	drvdata->mode = LM3530_BL_MODE_ALS;
	335	else if (mode == LM3530_BL_MODE_PWM) {
	336	dev_err(dev, "PWM mode not supported\n");
	337	return -EINVAL;
	338	}
	339
	340	err = lm3530_init_registers(drvdata);
	341	if (err) {
	342	dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
	343	return err;
	344	}
	345
	346	return sizeof(drvdata->mode);
	347	}
40b1445b	348	static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);
b1e6b706 SKS	349
	350	static int __devinit lm3530_probe(struct i2c_client *client,
	351	const struct i2c_device_id *id)
	352	{
	353	struct lm3530_platform_data *pdata = client->dev.platform_data;
	354	struct lm3530_data *drvdata;
	355	int err = 0;
	356
	357	if (pdata == NULL) {
	358	dev_err(&client->dev, "platform data required\n");
	359	err = -ENODEV;
	360	goto err_out;
	361	}
	362
	363	/* BL mode */
	364	if (pdata->mode > LM3530_BL_MODE_PWM) {
	365	dev_err(&client->dev, "Illegal Mode request\n");
	366	err = -EINVAL;
	367	goto err_out;
	368	}
	369
	370	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	371	dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
	372	err = -EIO;
	373	goto err_out;
	374	}
	375
	376	drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL);
	377	if (drvdata == NULL) {
	378	err = -ENOMEM;
	379	goto err_out;
	380	}
	381
	382	drvdata->mode = pdata->mode;
	383	drvdata->client = client;
	384	drvdata->pdata = pdata;
9b2da53f SKS	385	drvdata->brightness = LED_OFF;
9b2da53f SKS	386	drvdata->enable = false;
b1e6b706 SKS	387	drvdata->led_dev.name = LM3530_LED_DEV;
b1e6b706 SKS	388	drvdata->led_dev.brightness_set = lm3530_brightness_set;
bbe64532	389	drvdata->led_dev.max_brightness = MAX_BRIGHTNESS;
b1e6b706 SKS	390
	391	i2c_set_clientdata(client, drvdata);
	392
9b2da53f SKS	393	drvdata->regulator = regulator_get(&client->dev, "vin");
	394	if (IS_ERR(drvdata->regulator)) {
	395	dev_err(&client->dev, "regulator get failed\n");
	396	err = PTR_ERR(drvdata->regulator);
	397	drvdata->regulator = NULL;
	398	goto err_regulator_get;
b1e6b706 SKS	399	}
b1e6b706 SKS	400
9b2da53f SKS	401	if (drvdata->pdata->brt_val) {
	402	err = lm3530_init_registers(drvdata);
	403	if (err < 0) {
	404	dev_err(&client->dev,
	405	"Register Init failed: %d\n", err);
	406	err = -ENODEV;
	407	goto err_reg_init;
	408	}
	409	}
	410	err = led_classdev_register(&client->dev, &drvdata->led_dev);
b1e6b706 SKS	411	if (err < 0) {
	412	dev_err(&client->dev, "Register led class failed: %d\n", err);
	413	err = -ENODEV;
	414	goto err_class_register;
	415	}
	416
	417	err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode);
	418	if (err < 0) {
	419	dev_err(&client->dev, "File device creation failed: %d\n", err);
	420	err = -ENODEV;
	421	goto err_create_file;
	422	}
	423
	424	return 0;
	425
	426	err_create_file:
	427	led_classdev_unregister(&drvdata->led_dev);
	428	err_class_register:
	429	err_reg_init:
9b2da53f SKS	430	regulator_put(drvdata->regulator);
9b2da53f SKS	431	err_regulator_get:
b1e6b706 SKS	432	kfree(drvdata);
	433	err_out:
	434	return err;
	435	}
	436
	437	static int __devexit lm3530_remove(struct i2c_client *client)
	438	{
	439	struct lm3530_data *drvdata = i2c_get_clientdata(client);
	440
	441	device_remove_file(drvdata->led_dev.dev, &dev_attr_mode);
9b2da53f SKS	442
	443	if (drvdata->enable)
	444	regulator_disable(drvdata->regulator);
	445	regulator_put(drvdata->regulator);
b1e6b706 SKS	446	led_classdev_unregister(&drvdata->led_dev);
	447	kfree(drvdata);
	448	return 0;
	449	}
	450
	451	static const struct i2c_device_id lm3530_id[] = {
	452	{LM3530_NAME, 0},
	453	{}
	454	};
d5f33d45	455	MODULE_DEVICE_TABLE(i2c, lm3530_id);
b1e6b706 SKS	456
	457	static struct i2c_driver lm3530_i2c_driver = {
	458	.probe = lm3530_probe,
93f53982	459	.remove = __devexit_p(lm3530_remove),
b1e6b706 SKS	460	.id_table = lm3530_id,
	461	.driver = {
	462	.name = LM3530_NAME,
	463	.owner = THIS_MODULE,
	464	},
	465	};
	466
09a0d183	467	module_i2c_driver(lm3530_i2c_driver);
b1e6b706 SKS	468
	469	MODULE_DESCRIPTION("Back Light driver for LM3530");
	470	MODULE_LICENSE("GPL v2");
	471	MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");