Commit 82fd53b7 authored by Michael Hennerich's avatar Michael Hennerich Committed by Richard Purdie
Browse files

backlight: new driver for the ADP8860 backlight parts 



The ADP8860 combines a programmable backlight LED charge pump driver with
automatic phototransistor control.

Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent 9844ce05

drivers/video/backlight/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -264,6 +264,18 @@ config BACKLIGHT_ADP5520 
	  To compile this driver as a module, choose M here: the module will

	  be called adp5520_bl.



config BACKLIGHT_ADP8860

	tristate "Backlight Driver for ADP8860 using WLED"

	depends on BACKLIGHT_CLASS_DEVICE && I2C

	select NEW_LEDS

	select LEDS_CLASS

	help

	  If you have a LCD backlight connected to the ADP8860,

	  say Y here to enable this driver.



	  To compile this driver as a module, choose M here: the module will

	  be called adp8860_bl.



config BACKLIGHT_88PM860X

	tristate "Backlight Driver for 88PM8606 using WLED"

	depends on MFD_88PM860X

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -30,5 +30,6 @@ obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o 
obj-$(CONFIG_BACKLIGHT_WM831X)	+= wm831x_bl.o

obj-$(CONFIG_BACKLIGHT_ADX)    += adx_bl.o

obj-$(CONFIG_BACKLIGHT_ADP5520)	+= adp5520_bl.o

obj-$(CONFIG_BACKLIGHT_ADP8860)	+= adp8860_bl.o

obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o

drivers/video/backlight/adp8860_bl.c

0 → 100644
+809 −0
Original line number Diff line number Diff line 
/*

 * Backlight driver for Analog Devices ADP8860 Backlight Devices

 *

 * Copyright 2009-2010 Analog Devices Inc.

 *

 * Licensed under the GPL-2 or later.

 */



#include <linux/module.h>

#include <linux/version.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/pm.h>

#include <linux/platform_device.h>

#include <linux/i2c.h>

#include <linux/fb.h>

#include <linux/backlight.h>

#include <linux/leds.h>

#include <linux/workqueue.h>



#include <linux/i2c/adp8860.h>

#define ADP8860_EXT_FEATURES

#define ADP8860_USE_LEDS



#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */

#define ADP8860_MDCR 0x01 /* Device mode and status */

#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */

#define ADP8860_INTR_EN 0x03 /* Interrupts enable */

#define ADP8860_CFGR 0x04 /* Configuration register */

#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */

#define ADP8860_BLOFF 0x06 /* Backlight off timeout */

#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */

#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */

#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */

#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */

#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */

#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */

#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */

#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */

#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */

#define ADP8860_ISCC 0x10 /* Independent sink current control register */

#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */

#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */

#define ADP8860_ISCF 0x13 /* Independent sink current fade register */

#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */

#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */

#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */

#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */

#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */

#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */

#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */

#define ADP8860_CCFG 0x1B /* Comparator configuration */

#define ADP8860_CCFG2 0x1C /* Second comparator configuration */

#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */

#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */

#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */

#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */

#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */

#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */

#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */

#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */



#define ADP8860_MANUFID		0x0  /* Analog Devices ADP8860 Manufacturer ID */

#define ADP8860_DEVICEID	0x7  /* Analog Devices ADP8860 Device ID */

#define ADP8860_DEVID(x)	((x) & 0xF)

#define ADP8860_MANID(x)	((x) >> 4)



/* MDCR Device mode and status */

#define INT_CFG			(1 << 6)

#define NSTBY			(1 << 5)

#define DIM_EN			(1 << 4)

#define SIS_EN			(1 << 2)

#define CMP_AUTOEN		(1 << 1)

#define BLEN			(1 << 0)



/* ADP8860_CCFG Main ALS comparator level enable */

#define L3_EN			(1 << 1)

#define L2_EN			(1 << 0)



#define CFGR_BLV_SHIFT		3

#define CFGR_BLV_MASK		0x3

#define ADP8860_FLAG_LED_MASK	0xFF



#define FADE_VAL(in, out)	((0xF & (in)) | ((0xF & (out)) << 4))

#define BL_CFGR_VAL(law, blv)	((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))

#define ALS_CCFG_VAL(filt)	((0x7 & filt) << 5)



struct adp8860_led {

	struct led_classdev	cdev;

	struct work_struct	work;

	struct i2c_client	*client;

	enum led_brightness	new_brightness;

	int			id;

	int			flags;

};



struct adp8860_bl {

	struct i2c_client *client;

	struct backlight_device *bl;

	struct adp8860_led *led;

	struct adp8860_backlight_platform_data *pdata;

	struct mutex lock;

	unsigned long cached_daylight_max;

	int id;

	int revid;

	int current_brightness;

};



static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)

{

	int ret;



	ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0) {

		dev_err(&client->dev, "failed reading at 0x%02x\n", reg);

		return ret;

	}



	*val = (uint8_t)ret;

	return 0;

}





static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)

{

	return i2c_smbus_write_byte_data(client, reg, val);

}



static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)

{

	struct adp8860_bl *data = i2c_get_clientdata(client);

	uint8_t reg_val;

	int ret;



	mutex_lock(&data->lock);



	ret = adp8860_read(client, reg, &reg_val);



	if (!ret && ((reg_val & bit_mask) == 0)) {

		reg_val |= bit_mask;

		ret = adp8860_write(client, reg, reg_val);

	}



	mutex_unlock(&data->lock);

	return ret;

}



static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)

{

	struct adp8860_bl *data = i2c_get_clientdata(client);

	uint8_t reg_val;

	int ret;



	mutex_lock(&data->lock);



	ret = adp8860_read(client, reg, &reg_val);



	if (!ret && (reg_val & bit_mask)) {

		reg_val &= ~bit_mask;

		ret = adp8860_write(client, reg, reg_val);

	}



	mutex_unlock(&data->lock);

	return ret;

}



/*

 * Independent sink / LED

 */

#if defined(ADP8860_USE_LEDS)

static void adp8860_led_work(struct work_struct *work)

{

	struct adp8860_led *led = container_of(work, struct adp8860_led, work);

	adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,

			 led->new_brightness >> 1);

}



static void adp8860_led_set(struct led_classdev *led_cdev,

			   enum led_brightness value)

{

	struct adp8860_led *led;



	led = container_of(led_cdev, struct adp8860_led, cdev);

	led->new_brightness = value;

	schedule_work(&led->work);

}



static int adp8860_led_setup(struct adp8860_led *led)

{

	struct i2c_client *client = led->client;

	int ret = 0;



	ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);

	ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));



	if (led->id > 4)

		ret |= adp8860_set_bits(client, ADP8860_ISCT1,

				(led->flags & 0x3) << ((led->id - 5) * 2));

	else

		ret |= adp8860_set_bits(client, ADP8860_ISCT2,

				(led->flags & 0x3) << ((led->id - 1) * 2));



	return ret;

}



static int __devinit adp8860_led_probe(struct i2c_client *client)

{

	struct adp8860_backlight_platform_data *pdata =

		client->dev.platform_data;

	struct adp8860_bl *data = i2c_get_clientdata(client);

	struct adp8860_led *led, *led_dat;

	struct led_info *cur_led;

	int ret, i;



	led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);

	if (led == NULL) {

		dev_err(&client->dev, "failed to alloc memory\n");

		return -ENOMEM;

	}



	ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);

	ret = adp8860_write(client, ADP8860_ISCT1,

			(pdata->led_on_time & 0x3) << 6);

	ret |= adp8860_write(client, ADP8860_ISCF,

			FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));



	if (ret) {

		dev_err(&client->dev, "failed to write\n");

		goto err_free;

	}



	for (i = 0; i < pdata->num_leds; ++i) {

		cur_led = &pdata->leds[i];

		led_dat = &led[i];



		led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;



		if (led_dat->id > 7 || led_dat->id < 1) {

			dev_err(&client->dev, "Invalid LED ID %d\n",

				led_dat->id);

			goto err;

		}



		if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {

			dev_err(&client->dev, "LED %d used by Backlight\n",

				led_dat->id);

			goto err;

		}



		led_dat->cdev.name = cur_led->name;

		led_dat->cdev.default_trigger = cur_led->default_trigger;

		led_dat->cdev.brightness_set = adp8860_led_set;

		led_dat->cdev.brightness = LED_OFF;

		led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;

		led_dat->client = client;

		led_dat->new_brightness = LED_OFF;

		INIT_WORK(&led_dat->work, adp8860_led_work);



		ret = led_classdev_register(&client->dev, &led_dat->cdev);

		if (ret) {

			dev_err(&client->dev, "failed to register LED %d\n",

				led_dat->id);

			goto err;

		}



		ret = adp8860_led_setup(led_dat);

		if (ret) {

			dev_err(&client->dev, "failed to write\n");

			i++;

			goto err;

		}

	}



	data->led = led;



	return 0;



 err:

	for (i = i - 1; i >= 0; --i) {

		led_classdev_unregister(&led[i].cdev);

		cancel_work_sync(&led[i].work);

	}



 err_free:

	kfree(led);



	return ret;

}



static int __devexit adp8860_led_remove(struct i2c_client *client)

{

	struct adp8860_backlight_platform_data *pdata =

		client->dev.platform_data;

	struct adp8860_bl *data = i2c_get_clientdata(client);

	int i;



	for (i = 0; i < pdata->num_leds; i++) {

		led_classdev_unregister(&data->led[i].cdev);

		cancel_work_sync(&data->led[i].work);

	}



	kfree(data->led);

	return 0;

}

#else

static int __devinit adp8860_led_probe(struct i2c_client *client)

{

	return 0;

}



static int __devexit adp8860_led_remove(struct i2c_client *client)

{

	return 0;

}

#endif



static int adp8860_bl_set(struct backlight_device *bl, int brightness)

{

	struct adp8860_bl *data = bl_get_data(bl);

	struct i2c_client *client = data->client;

	int ret = 0;



	if (data->pdata->en_ambl_sens) {

		if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {

			/* Disable Ambient Light auto adjust */

			ret |= adp8860_clr_bits(client, ADP8860_MDCR,

					CMP_AUTOEN);

			ret |= adp8860_write(client, ADP8860_BLMX1, brightness);

		} else {

			/*

			 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust

			 * restore daylight l1 sysfs brightness

			 */

			ret |= adp8860_write(client, ADP8860_BLMX1,

					 data->cached_daylight_max);

			ret |= adp8860_set_bits(client, ADP8860_MDCR,

					 CMP_AUTOEN);

		}

	} else

		ret |= adp8860_write(client, ADP8860_BLMX1, brightness);



	if (data->current_brightness && brightness == 0)

		ret |= adp8860_set_bits(client,

				ADP8860_MDCR, DIM_EN);

	else if (data->current_brightness == 0 && brightness)

		ret |= adp8860_clr_bits(client,

				ADP8860_MDCR, DIM_EN);



	if (!ret)

		data->current_brightness = brightness;



	return ret;

}



static int adp8860_bl_update_status(struct backlight_device *bl)

{

	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)

		brightness = 0;



	if (bl->props.fb_blank != FB_BLANK_UNBLANK)

		brightness = 0;



	return adp8860_bl_set(bl, brightness);

}



static int adp8860_bl_get_brightness(struct backlight_device *bl)

{

	struct adp8860_bl *data = bl_get_data(bl);



	return data->current_brightness;

}



static const struct backlight_ops adp8860_bl_ops = {

	.update_status	= adp8860_bl_update_status,

	.get_brightness	= adp8860_bl_get_brightness,

};



static int adp8860_bl_setup(struct backlight_device *bl)

{

	struct adp8860_bl *data = bl_get_data(bl);

	struct i2c_client *client = data->client;

	struct adp8860_backlight_platform_data *pdata = data->pdata;

	int ret = 0;



	ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);

	ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);

	ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);



	if (pdata->en_ambl_sens) {

		data->cached_daylight_max = pdata->l1_daylight_max;

		ret |= adp8860_write(client, ADP8860_BLMX2,

						pdata->l2_office_max);

		ret |= adp8860_write(client, ADP8860_BLDM2,

						pdata->l2_office_dim);

		ret |= adp8860_write(client, ADP8860_BLMX3,

						pdata->l3_dark_max);

		ret |= adp8860_write(client, ADP8860_BLDM3,

						pdata->l3_dark_dim);



		ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);

		ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);

		ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);

		ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);

		ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |

						ALS_CCFG_VAL(pdata->abml_filt));

	}



	ret |= adp8860_write(client, ADP8860_CFGR,

			BL_CFGR_VAL(pdata->bl_fade_law, 0));



	ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,

			pdata->bl_fade_out));



	ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY);



	return ret;

}



static ssize_t adp8860_show(struct device *dev, char *buf, int reg)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);

	int error;

	uint8_t reg_val;



	mutex_lock(&data->lock);

	error = adp8860_read(data->client, reg, &reg_val);

	mutex_unlock(&data->lock);



	if (error < 0)

		return error;



	return sprintf(buf, "%u\n", reg_val);

}



static ssize_t adp8860_store(struct device *dev, const char *buf,

			 size_t count, int reg)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);

	unsigned long val;

	int ret;



	ret = strict_strtoul(buf, 10, &val);

	if (ret)

		return ret;



	mutex_lock(&data->lock);

	adp8860_write(data->client, reg, val);

	mutex_unlock(&data->lock);



	return count;

}



static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLMX3);

}



static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	return adp8860_store(dev, buf, count, ADP8860_BLMX3);

}



static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,

			adp8860_bl_l3_dark_max_store);



static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLMX2);

}



static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	return adp8860_store(dev, buf, count, ADP8860_BLMX2);

}

static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,

			adp8860_bl_l2_office_max_store);



static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLMX1);

}



static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);



	strict_strtoul(buf, 10, &data->cached_daylight_max);

	return adp8860_store(dev, buf, count, ADP8860_BLMX1);

}

static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,

			adp8860_bl_l1_daylight_max_store);



static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLDM3);

}



static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,

				     struct device_attribute *attr,

				     const char *buf, size_t count)

{

	return adp8860_store(dev, buf, count, ADP8860_BLDM3);

}

static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,

			adp8860_bl_l3_dark_dim_store);



static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLDM2);

}



static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,

				     struct device_attribute *attr,

				     const char *buf, size_t count)

{

	return adp8860_store(dev, buf, count, ADP8860_BLDM2);

}

static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,

			adp8860_bl_l2_office_dim_store);



static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	return adp8860_show(dev, buf, ADP8860_BLDM1);

}



static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,

				     struct device_attribute *attr,

				     const char *buf, size_t count)

{

	return adp8860_store(dev, buf, count, ADP8860_BLDM1);

}

static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,

			adp8860_bl_l1_daylight_dim_store);



#ifdef ADP8860_EXT_FEATURES

static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);

	int error;

	uint8_t reg_val;

	uint16_t ret_val;



	mutex_lock(&data->lock);

	error = adp8860_read(data->client, ADP8860_PH1LEVL, &reg_val);

	ret_val = reg_val;

	error |= adp8860_read(data->client, ADP8860_PH1LEVH, &reg_val);

	mutex_unlock(&data->lock);



	if (error < 0)

		return error;



	/* Return 13-bit conversion value for the first light sensor */

	ret_val += (reg_val & 0x1F) << 8;



	return sprintf(buf, "%u\n", ret_val);

}

static DEVICE_ATTR(ambient_light_level, 0444,

		adp8860_bl_ambient_light_level_show, NULL);



static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,

				     struct device_attribute *attr, char *buf)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);

	int error;

	uint8_t reg_val;



	mutex_lock(&data->lock);

	error = adp8860_read(data->client, ADP8860_CFGR, &reg_val);

	mutex_unlock(&data->lock);



	if (error < 0)

		return error;



	return sprintf(buf, "%u\n",

		((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);

}



static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,

				     struct device_attribute *attr,

				     const char *buf, size_t count)

{

	struct adp8860_bl *data = dev_get_drvdata(dev);

	unsigned long val;

	uint8_t reg_val;

	int ret;



	ret = strict_strtoul(buf, 10, &val);

	if (ret)

		return ret;



	if (val == 0) {

		/* Enable automatic ambient light sensing */

		adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);

	} else if ((val > 0) && (val < 6)) {

		/* Disable automatic ambient light sensing */

		adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);



		/* Set user supplied ambient light zone */

		mutex_lock(&data->lock);

		adp8860_read(data->client, ADP8860_CFGR, &reg_val);

		reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);

		reg_val |= val << CFGR_BLV_SHIFT;

		adp8860_write(data->client, ADP8860_CFGR, reg_val);

		mutex_unlock(&data->lock);

	}



	return count;

}

static DEVICE_ATTR(ambient_light_zone, 0664,

		adp8860_bl_ambient_light_zone_show,

		adp8860_bl_ambient_light_zone_store);

#endif



static struct attribute *adp8860_bl_attributes[] = {

	&dev_attr_l3_dark_max.attr,

	&dev_attr_l3_dark_dim.attr,

	&dev_attr_l2_office_max.attr,

	&dev_attr_l2_office_dim.attr,

	&dev_attr_l1_daylight_max.attr,

	&dev_attr_l1_daylight_dim.attr,

#ifdef ADP8860_EXT_FEATURES

	&dev_attr_ambient_light_level.attr,

	&dev_attr_ambient_light_zone.attr,

#endif

	NULL

};



static const struct attribute_group adp8860_bl_attr_group = {

	.attrs = adp8860_bl_attributes,

};



static int __devinit adp8860_probe(struct i2c_client *client,

					const struct i2c_device_id *id)

{

	struct backlight_device *bl;

	struct adp8860_bl *data;

	struct adp8860_backlight_platform_data *pdata =

		client->dev.platform_data;

	uint8_t reg_val;

	int ret;



	if (!i2c_check_functionality(client->adapter,

					I2C_FUNC_SMBUS_BYTE_DATA)) {

		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");

		return -EIO;

	}



	if (!pdata) {

		dev_err(&client->dev, "no platform data?\n");

		return -EINVAL;

	}



	ret = adp8860_read(client, ADP8860_MFDVID, &reg_val);

	if (ret < 0)

		return -EIO;



	if (ADP8860_MANID(reg_val) != ADP8860_MANUFID) {

		dev_err(&client->dev, "failed to probe\n");

		return -ENODEV;

	}



	data = kzalloc(sizeof(*data), GFP_KERNEL);

	if (data == NULL)

		return -ENOMEM;



	/* It's confirmed that the DEVID field is actually a REVID */



	data->revid = ADP8860_DEVID(reg_val);

	data->client = client;

	data->pdata = pdata;

	data->id = id->driver_data;

	data->current_brightness = 0;

	i2c_set_clientdata(client, data);



	mutex_init(&data->lock);



	bl = backlight_device_register(dev_driver_string(&client->dev),

			&client->dev, data, &adp8860_bl_ops);

	if (IS_ERR(bl)) {

		dev_err(&client->dev, "failed to register backlight\n");

		ret = PTR_ERR(bl);

		goto out2;

	}



	bl->props.max_brightness =

		bl->props.brightness = ADP8860_MAX_BRIGHTNESS;



	data->bl = bl;



	if (pdata->en_ambl_sens)

		ret = sysfs_create_group(&bl->dev.kobj,

			&adp8860_bl_attr_group);



	if (ret) {

		dev_err(&client->dev, "failed to register sysfs\n");

		goto out1;

	}



	ret = adp8860_bl_setup(bl);

	if (ret) {

		ret = -EIO;

		goto out;

	}



	backlight_update_status(bl);



	dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);



	if (pdata->num_leds)

		adp8860_led_probe(client);



	return 0;



out:

	if (data->pdata->en_ambl_sens)

		sysfs_remove_group(&data->bl->dev.kobj,

			&adp8860_bl_attr_group);

out1:

	backlight_device_unregister(bl);

out2:

	i2c_set_clientdata(client, NULL);

	kfree(data);



	return ret;

}



static int __devexit adp8860_remove(struct i2c_client *client)

{

	struct adp8860_bl *data = i2c_get_clientdata(client);



	adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);



	if (data->led)

		adp8860_led_remove(client);



	if (data->pdata->en_ambl_sens)

		sysfs_remove_group(&data->bl->dev.kobj,

			&adp8860_bl_attr_group);



	backlight_device_unregister(data->bl);

	i2c_set_clientdata(client, NULL);

	kfree(data);



	return 0;

}



#ifdef CONFIG_PM

static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message)

{

	adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);



	return 0;

}



static int adp8860_i2c_resume(struct i2c_client *client)

{

	adp8860_set_bits(client, ADP8860_MDCR, NSTBY);



	return 0;

}

#else

#define adp8860_i2c_suspend NULL

#define adp8860_i2c_resume NULL

#endif



static const struct i2c_device_id adp8860_id[] = {

	{ "adp8860", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, adp8860_id);



static struct i2c_driver adp8860_driver = {

	.driver = {

		.name = KBUILD_MODNAME,

	},

	.probe    = adp8860_probe,

	.remove   = __devexit_p(adp8860_remove),

	.suspend = adp8860_i2c_suspend,

	.resume  = adp8860_i2c_resume,

	.id_table = adp8860_id,

};



static int __init adp8860_init(void)

{

	return i2c_add_driver(&adp8860_driver);

}

module_init(adp8860_init);



static void __exit adp8860_exit(void)

{

	i2c_del_driver(&adp8860_driver);

}

module_exit(adp8860_exit);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");

MODULE_DESCRIPTION("ADP8860 Backlight driver");

MODULE_ALIAS("i2c:adp8860-backlight");

include/linux/i2c/adp8860.h

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