drivers/video/backlight/adp5520_bl.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
  *
  * Copyright 2009 Analog Devices Inc.
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/fb.h>
 #include <linux/backlight.h>
 #include <linux/mfd/adp5520.h>
 #include <linux/slab.h>
 #include <linux/module.h>

 struct adp5520_bl {
 	struct device *master;
 	struct adp5520_backlight_platform_data *pdata;
 	struct mutex lock;
 	unsigned long cached_daylight_max;
 	int id;
 	int current_brightness;
 };

 static int adp5520_bl_set(struct backlight_device *bl, int brightness)
 {
 	struct adp5520_bl *data = bl_get_data(bl);
 	struct device *master = data->master;
 	int ret = 0;

 	if (data->pdata->en_ambl_sens) {
 		if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
 			/* Disable Ambient Light auto adjust */
 			ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
 					ADP5520_BL_AUTO_ADJ);
 			ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
 					brightness);
 		} else {
 			/*
 			 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
 			 * restore daylight l3 sysfs brightness
 			 */
 			ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
 					 data->cached_daylight_max);
 			ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
 					 ADP5520_BL_AUTO_ADJ);
 		}
 	} else {
 		ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
 	}

 	if (data->current_brightness && brightness == 0)
 		ret |= adp5520_set_bits(master,
 				ADP5520_MODE_STATUS, ADP5520_DIM_EN);
 	else if (data->current_brightness == 0 && brightness)
 		ret |= adp5520_clr_bits(master,
 				ADP5520_MODE_STATUS, ADP5520_DIM_EN);

 	if (!ret)
 		data->current_brightness = brightness;

 	return ret;
 }

 static int adp5520_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 adp5520_bl_set(bl, brightness);
 }

 static int adp5520_bl_get_brightness(struct backlight_device *bl)
 {
 	struct adp5520_bl *data = bl_get_data(bl);
 	int error;
 	uint8_t reg_val;

 	error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);

 	return error ? data->current_brightness : reg_val;
 }

 static const struct backlight_ops adp5520_bl_ops = {
 	.update_status	= adp5520_bl_update_status,
 	.get_brightness	= adp5520_bl_get_brightness,
 };

 static int adp5520_bl_setup(struct backlight_device *bl)
 {
 	struct adp5520_bl *data = bl_get_data(bl);
 	struct device *master = data->master;
 	struct adp5520_backlight_platform_data *pdata = data->pdata;
 	int ret = 0;

 	ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
 				pdata->l1_daylight_max);
 	ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
 				pdata->l1_daylight_dim);

 	if (pdata->en_ambl_sens) {
 		data->cached_daylight_max = pdata->l1_daylight_max;
 		ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
 				pdata->l2_office_max);
 		ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
 				pdata->l2_office_dim);
 		ret |= adp5520_write(master, ADP5520_DARK_MAX,
 				pdata->l3_dark_max);
 		ret |= adp5520_write(master, ADP5520_DARK_DIM,
 				pdata->l3_dark_dim);
 		ret |= adp5520_write(master, ADP5520_L2_TRIP,
 				pdata->l2_trip);
 		ret |= adp5520_write(master, ADP5520_L2_HYS,
 				pdata->l2_hyst);
 		ret |= adp5520_write(master, ADP5520_L3_TRIP,
 				 pdata->l3_trip);
 		ret |= adp5520_write(master, ADP5520_L3_HYS,
 				pdata->l3_hyst);
 		ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
 				ALS_CMPR_CFG_VAL(pdata->abml_filt,
 				ADP5520_L3_EN));
 	}

 	ret |= adp5520_write(master, ADP5520_BL_CONTROL,
 			BL_CTRL_VAL(pdata->fade_led_law,
 					pdata->en_ambl_sens));

 	ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
 			pdata->fade_out));

 	ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
 			ADP5520_BL_EN | ADP5520_DIM_EN);

 	return ret;
 }

 static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
 {
 	struct adp5520_bl *data = dev_get_drvdata(dev);
 	int ret;
 	uint8_t reg_val;

 	mutex_lock(&data->lock);
 	ret = adp5520_read(data->master, reg, &reg_val);
 	mutex_unlock(&data->lock);

 	if (ret < 0)
 		return ret;

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

 static ssize_t adp5520_store(struct device *dev, const char *buf,
 			 size_t count, int reg)
 {
 	struct adp5520_bl *data = dev_get_drvdata(dev);
 	unsigned long val;
 	int ret;

 	ret = kstrtoul(buf, 10, &val);
 	if (ret)
 		return ret;

 	mutex_lock(&data->lock);
 	adp5520_write(data->master, reg, val);
 	mutex_unlock(&data->lock);

 	return count;
 }

 static ssize_t adp5520_bl_dark_max_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_DARK_MAX);
 }

 static ssize_t adp5520_bl_dark_max_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
 }
 static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
 			adp5520_bl_dark_max_store);

 static ssize_t adp5520_bl_office_max_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
 }

 static ssize_t adp5520_bl_office_max_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
 }
 static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
 			adp5520_bl_office_max_store);

 static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
 }

 static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	struct adp5520_bl *data = dev_get_drvdata(dev);
 	int ret;

 	ret = kstrtoul(buf, 10, &data->cached_daylight_max);
 	if (ret < 0)
 		return ret;

 	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
 }
 static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
 			adp5520_bl_daylight_max_store);

 static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_DARK_DIM);
 }

 static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
 }
 static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
 			adp5520_bl_dark_dim_store);

 static ssize_t adp5520_bl_office_dim_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
 }

 static ssize_t adp5520_bl_office_dim_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
 }
 static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
 			adp5520_bl_office_dim_store);

 static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
 }

 static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
 			struct device_attribute *attr,
 			const char *buf, size_t count)
 {
 	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
 }
 static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
 			adp5520_bl_daylight_dim_store);

 static struct attribute *adp5520_bl_attributes[] = {
 	&dev_attr_dark_max.attr,
 	&dev_attr_dark_dim.attr,
 	&dev_attr_office_max.attr,
 	&dev_attr_office_dim.attr,
 	&dev_attr_daylight_max.attr,
 	&dev_attr_daylight_dim.attr,
 	NULL
 };

 static const struct attribute_group adp5520_bl_attr_group = {
 	.attrs = adp5520_bl_attributes,
 };

 static int adp5520_bl_probe(struct platform_device *pdev)
 {
 	struct backlight_properties props;
 	struct backlight_device *bl;
 	struct adp5520_bl *data;
 	int ret = 0;

 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;

 	data->master = pdev->dev.parent;
 	data->pdata = dev_get_platdata(&pdev->dev);

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

 	data->id = pdev->id;
 	data->current_brightness = 0;

 	mutex_init(&data->lock);

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = ADP5020_MAX_BRIGHTNESS;
 	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
 					data->master, data, &adp5520_bl_ops,
 					&props);
 	if (IS_ERR(bl)) {
 		dev_err(&pdev->dev, "failed to register backlight\n");
 		return PTR_ERR(bl);
 	}

 	bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
 	if (data->pdata->en_ambl_sens)
 		ret = sysfs_create_group(&bl->dev.kobj,
 			&adp5520_bl_attr_group);

 	if (ret) {
 		dev_err(&pdev->dev, "failed to register sysfs\n");
 		return ret;
 	}

 	platform_set_drvdata(pdev, bl);
 	ret = adp5520_bl_setup(bl);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup\n");
 		if (data->pdata->en_ambl_sens)
 			sysfs_remove_group(&bl->dev.kobj,
 					&adp5520_bl_attr_group);
 		return ret;
 	}

 	backlight_update_status(bl);

 	return 0;
 }

 static int adp5520_bl_remove(struct platform_device *pdev)
 {
 	struct backlight_device *bl = platform_get_drvdata(pdev);
 	struct adp5520_bl *data = bl_get_data(bl);

 	adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);

 	if (data->pdata->en_ambl_sens)
 		sysfs_remove_group(&bl->dev.kobj,
 				&adp5520_bl_attr_group);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int adp5520_bl_suspend(struct device *dev)
 {
 	struct backlight_device *bl = dev_get_drvdata(dev);

 	return adp5520_bl_set(bl, 0);
 }

 static int adp5520_bl_resume(struct device *dev)
 {
 	struct backlight_device *bl = dev_get_drvdata(dev);

 	backlight_update_status(bl);
 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
 			adp5520_bl_resume);

 static struct platform_driver adp5520_bl_driver = {
 	.driver		= {
 		.name	= "adp5520-backlight",
 		.pm	= &adp5520_bl_pm_ops,
 	},
 	.probe		= adp5520_bl_probe,
 	.remove		= adp5520_bl_remove,
 };

 module_platform_driver(adp5520_bl_driver);

 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:adp5520-backlight");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
	*
	* Copyright 2009 Analog Devices Inc.
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/fb.h>
	#include <linux/backlight.h>
	#include <linux/mfd/adp5520.h>
	#include <linux/slab.h>
	#include <linux/module.h>

	struct adp5520_bl {
	struct device *master;
	struct adp5520_backlight_platform_data *pdata;
	struct mutex lock;
	unsigned long cached_daylight_max;
	int id;
	int current_brightness;
	};

	static int adp5520_bl_set(struct backlight_device *bl, int brightness)
	{
	struct adp5520_bl *data = bl_get_data(bl);
	struct device *master = data->master;
	int ret = 0;

	if (data->pdata->en_ambl_sens) {
	if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
	/* Disable Ambient Light auto adjust */
	ret \|= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
	ADP5520_BL_AUTO_ADJ);
	ret \|= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
	brightness);
	} else {
	/*
	* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
	* restore daylight l3 sysfs brightness
	*/
	ret \|= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
	data->cached_daylight_max);
	ret \|= adp5520_set_bits(master, ADP5520_BL_CONTROL,
	ADP5520_BL_AUTO_ADJ);
	}
	} else {
	ret \|= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
	}

	if (data->current_brightness && brightness == 0)
	ret \|= adp5520_set_bits(master,
	ADP5520_MODE_STATUS, ADP5520_DIM_EN);
	else if (data->current_brightness == 0 && brightness)
	ret \|= adp5520_clr_bits(master,
	ADP5520_MODE_STATUS, ADP5520_DIM_EN);

	if (!ret)
	data->current_brightness = brightness;

	return ret;
	}

	static int adp5520_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 adp5520_bl_set(bl, brightness);
	}

	static int adp5520_bl_get_brightness(struct backlight_device *bl)
	{
	struct adp5520_bl *data = bl_get_data(bl);
	int error;
	uint8_t reg_val;

	error = adp5520_read(data->master, ADP5520_BL_VALUE, &reg_val);

	return error ? data->current_brightness : reg_val;
	}

	static const struct backlight_ops adp5520_bl_ops = {
	.update_status = adp5520_bl_update_status,
	.get_brightness = adp5520_bl_get_brightness,
	};

	static int adp5520_bl_setup(struct backlight_device *bl)
	{
	struct adp5520_bl *data = bl_get_data(bl);
	struct device *master = data->master;
	struct adp5520_backlight_platform_data *pdata = data->pdata;
	int ret = 0;

	ret \|= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
	pdata->l1_daylight_max);
	ret \|= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
	pdata->l1_daylight_dim);

	if (pdata->en_ambl_sens) {
	data->cached_daylight_max = pdata->l1_daylight_max;
	ret \|= adp5520_write(master, ADP5520_OFFICE_MAX,
	pdata->l2_office_max);
	ret \|= adp5520_write(master, ADP5520_OFFICE_DIM,
	pdata->l2_office_dim);
	ret \|= adp5520_write(master, ADP5520_DARK_MAX,
	pdata->l3_dark_max);
	ret \|= adp5520_write(master, ADP5520_DARK_DIM,
	pdata->l3_dark_dim);
	ret \|= adp5520_write(master, ADP5520_L2_TRIP,
	pdata->l2_trip);
	ret \|= adp5520_write(master, ADP5520_L2_HYS,
	pdata->l2_hyst);
	ret \|= adp5520_write(master, ADP5520_L3_TRIP,
	pdata->l3_trip);
	ret \|= adp5520_write(master, ADP5520_L3_HYS,
	pdata->l3_hyst);
	ret \|= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
	ALS_CMPR_CFG_VAL(pdata->abml_filt,
	ADP5520_L3_EN));
	}

	ret \|= adp5520_write(master, ADP5520_BL_CONTROL,
	BL_CTRL_VAL(pdata->fade_led_law,
	pdata->en_ambl_sens));

	ret \|= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
	pdata->fade_out));

	ret \|= adp5520_set_bits(master, ADP5520_MODE_STATUS,
	ADP5520_BL_EN \| ADP5520_DIM_EN);

	return ret;
	}

	static ssize_t adp5520_show(struct device dev, char buf, int reg)
	{
	struct adp5520_bl *data = dev_get_drvdata(dev);
	int ret;
	uint8_t reg_val;

	mutex_lock(&data->lock);
	ret = adp5520_read(data->master, reg, &reg_val);
	mutex_unlock(&data->lock);

	if (ret < 0)
	return ret;

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

	static ssize_t adp5520_store(struct device dev, const char buf,
	size_t count, int reg)
	{
	struct adp5520_bl *data = dev_get_drvdata(dev);
	unsigned long val;
	int ret;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
	return ret;

	mutex_lock(&data->lock);
	adp5520_write(data->master, reg, val);
	mutex_unlock(&data->lock);

	return count;
	}

	static ssize_t adp5520_bl_dark_max_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_DARK_MAX);
	}

	static ssize_t adp5520_bl_dark_max_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
	}
	static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
	adp5520_bl_dark_max_store);

	static ssize_t adp5520_bl_office_max_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
	}

	static ssize_t adp5520_bl_office_max_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
	}
	static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
	adp5520_bl_office_max_store);

	static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
	}

	static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct adp5520_bl *data = dev_get_drvdata(dev);
	int ret;

	ret = kstrtoul(buf, 10, &data->cached_daylight_max);
	if (ret < 0)
	return ret;

	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
	}
	static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
	adp5520_bl_daylight_max_store);

	static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_DARK_DIM);
	}

	static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
	}
	static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
	adp5520_bl_dark_dim_store);

	static ssize_t adp5520_bl_office_dim_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
	}

	static ssize_t adp5520_bl_office_dim_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
	}
	static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
	adp5520_bl_office_dim_store);

	static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
	}

	static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
	}
	static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
	adp5520_bl_daylight_dim_store);

	static struct attribute *adp5520_bl_attributes[] = {
	&dev_attr_dark_max.attr,
	&dev_attr_dark_dim.attr,
	&dev_attr_office_max.attr,
	&dev_attr_office_dim.attr,
	&dev_attr_daylight_max.attr,
	&dev_attr_daylight_dim.attr,
	NULL
	};

	static const struct attribute_group adp5520_bl_attr_group = {
	.attrs = adp5520_bl_attributes,
	};

	static int adp5520_bl_probe(struct platform_device *pdev)
	{
	struct backlight_properties props;
	struct backlight_device *bl;
	struct adp5520_bl *data;
	int ret = 0;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;

	data->master = pdev->dev.parent;
	data->pdata = dev_get_platdata(&pdev->dev);

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

	data->id = pdev->id;
	data->current_brightness = 0;

	mutex_init(&data->lock);

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = ADP5020_MAX_BRIGHTNESS;
	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
	data->master, data, &adp5520_bl_ops,
	&props);
	if (IS_ERR(bl)) {
	dev_err(&pdev->dev, "failed to register backlight\n");
	return PTR_ERR(bl);
	}

	bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
	if (data->pdata->en_ambl_sens)
	ret = sysfs_create_group(&bl->dev.kobj,
	&adp5520_bl_attr_group);

	if (ret) {
	dev_err(&pdev->dev, "failed to register sysfs\n");
	return ret;
	}

	platform_set_drvdata(pdev, bl);
	ret = adp5520_bl_setup(bl);
	if (ret) {
	dev_err(&pdev->dev, "failed to setup\n");
	if (data->pdata->en_ambl_sens)
	sysfs_remove_group(&bl->dev.kobj,
	&adp5520_bl_attr_group);
	return ret;
	}

	backlight_update_status(bl);

	return 0;
	}

	static int adp5520_bl_remove(struct platform_device *pdev)
	{
	struct backlight_device *bl = platform_get_drvdata(pdev);
	struct adp5520_bl *data = bl_get_data(bl);

	adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);

	if (data->pdata->en_ambl_sens)
	sysfs_remove_group(&bl->dev.kobj,
	&adp5520_bl_attr_group);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int adp5520_bl_suspend(struct device *dev)
	{
	struct backlight_device *bl = dev_get_drvdata(dev);

	return adp5520_bl_set(bl, 0);
	}

	static int adp5520_bl_resume(struct device *dev)
	{
	struct backlight_device *bl = dev_get_drvdata(dev);

	backlight_update_status(bl);
	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
	adp5520_bl_resume);

	static struct platform_driver adp5520_bl_driver = {
	.driver = {
	.name = "adp5520-backlight",
	.pm = &adp5520_bl_pm_ops,
	},
	.probe = adp5520_bl_probe,
	.remove = adp5520_bl_remove,
	};

	module_platform_driver(adp5520_bl_driver);

	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:adp5520-backlight");