drivers/leds/leds-lm3533.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * leds-lm3533.c -- LM3533 LED driver
  *
  * Copyright (C) 2011-2012 Texas Instruments
  *
  * Author: Johan Hovold <jhovold@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under  the terms of the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the License, or (at your
  * option) any later version.
  */

 #include <linux/module.h>
 #include <linux/leds.h>
 #include <linux/mfd/core.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>

 #include <linux/mfd/lm3533.h>


 #define LM3533_LVCTRLBANK_MIN		2
 #define LM3533_LVCTRLBANK_MAX		5
 #define LM3533_LVCTRLBANK_COUNT		4
 #define LM3533_RISEFALLTIME_MAX		7
 #define LM3533_ALS_CHANNEL_LV_MIN	1
 #define LM3533_ALS_CHANNEL_LV_MAX	2

 #define LM3533_REG_CTRLBANK_BCONF_BASE		0x1b
 #define LM3533_REG_PATTERN_ENABLE		0x28
 #define LM3533_REG_PATTERN_LOW_TIME_BASE	0x71
 #define LM3533_REG_PATTERN_HIGH_TIME_BASE	0x72
 #define LM3533_REG_PATTERN_RISETIME_BASE	0x74
 #define LM3533_REG_PATTERN_FALLTIME_BASE	0x75

 #define LM3533_REG_PATTERN_STEP			0x10

 #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK		0x04
 #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK		0x02
 #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK	0x01

 #define LM3533_LED_FLAG_PATTERN_ENABLE		1


 struct lm3533_led {
 	struct lm3533 *lm3533;
 	struct lm3533_ctrlbank cb;
 	struct led_classdev cdev;
 	int id;

 	struct mutex mutex;
 	unsigned long flags;
 };


 static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
 {
 	return container_of(cdev, struct lm3533_led, cdev);
 }

 static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
 {
 	return led->id + 2;
 }

 static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
 {
 	return base + led->id;
 }

 static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
 {
 	return led->id;
 }

 static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
 								u8 base)
 {
 	return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
 }

 static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
 {
 	u8 mask;
 	u8 val;
 	int pattern;
 	int state;
 	int ret = 0;

 	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);

 	mutex_lock(&led->mutex);

 	state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 	if ((enable && state) || (!enable && !state))
 		goto out;

 	pattern = lm3533_led_get_pattern(led);
 	mask = 1 << (2 * pattern);

 	if (enable)
 		val = mask;
 	else
 		val = 0;

 	ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
 	if (ret) {
 		dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
 							pattern, enable);
 		goto out;
 	}

 	__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
 out:
 	mutex_unlock(&led->mutex);

 	return ret;
 }

 static int lm3533_led_set(struct led_classdev *cdev,
 						enum led_brightness value)
 {
 	struct lm3533_led *led = to_lm3533_led(cdev);

 	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);

 	if (value == 0)
 		lm3533_led_pattern_enable(led, 0);	/* disable blink */

 	return lm3533_ctrlbank_set_brightness(&led->cb, value);
 }

 static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
 {
 	struct lm3533_led *led = to_lm3533_led(cdev);
 	u8 val;
 	int ret;

 	ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
 	if (ret)
 		return ret;

 	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);

 	return val;
 }

 /* Pattern generator defines (delays in us). */
 #define LM3533_LED_DELAY1_VMIN	0x00
 #define LM3533_LED_DELAY2_VMIN	0x3d
 #define LM3533_LED_DELAY3_VMIN	0x80

 #define LM3533_LED_DELAY1_VMAX	(LM3533_LED_DELAY2_VMIN - 1)
 #define LM3533_LED_DELAY2_VMAX	(LM3533_LED_DELAY3_VMIN - 1)
 #define LM3533_LED_DELAY3_VMAX	0xff

 #define LM3533_LED_DELAY1_TMIN	16384U
 #define LM3533_LED_DELAY2_TMIN	1130496U
 #define LM3533_LED_DELAY3_TMIN	10305536U

 #define LM3533_LED_DELAY1_TMAX	999424U
 #define LM3533_LED_DELAY2_TMAX	9781248U
 #define LM3533_LED_DELAY3_TMAX	76890112U

 /* t_step = (t_max - t_min) / (v_max - v_min) */
 #define LM3533_LED_DELAY1_TSTEP	16384
 #define LM3533_LED_DELAY2_TSTEP	131072
 #define LM3533_LED_DELAY3_TSTEP	524288

 /* Delay limits for hardware accelerated blinking (in ms). */
 #define LM3533_LED_DELAY_ON_MAX \
 	((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
 #define LM3533_LED_DELAY_OFF_MAX \
 	((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)

 /*
  * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
  * size of t_step, where
  *
  *	t_step = (t_max - t_min) / (v_max - v_min)
  *
  * and updates *t to reflect the mapped value.
  */
 static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
 							u8 v_min, u8 v_max)
 {
 	unsigned val;

 	val = (*t + t_step / 2 - t_min) / t_step + v_min;

 	*t = t_step * (val - v_min) + t_min;

 	return (u8)val;
 }

 /*
  * Returns time code corresponding to *delay (in ms) and updates *delay to
  * reflect actual hardware delay.
  *
  * Hardware supports 256 discrete delay times, divided into three groups with
  * the following ranges and step-sizes:
  *
  *	[   16,   999]	[0x00, 0x3e]	step  16 ms
  *	[ 1130,  9781]	[0x3d, 0x7f]	step 131 ms
  *	[10306, 76890]	[0x80, 0xff]	step 524 ms
  *
  * Note that delay group 3 is only available for delay_off.
  */
 static u8 lm3533_led_get_hw_delay(unsigned *delay)
 {
 	unsigned t;
 	u8 val;

 	t = *delay * 1000;

 	if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
 		t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
 		val = time_to_val(&t,	LM3533_LED_DELAY3_TMIN,
 					LM3533_LED_DELAY3_TSTEP,
 					LM3533_LED_DELAY3_VMIN,
 					LM3533_LED_DELAY3_VMAX);
 	} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
 		t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
 		val = time_to_val(&t,	LM3533_LED_DELAY2_TMIN,
 					LM3533_LED_DELAY2_TSTEP,
 					LM3533_LED_DELAY2_VMIN,
 					LM3533_LED_DELAY2_VMAX);
 	} else {
 		t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
 		val = time_to_val(&t,	LM3533_LED_DELAY1_TMIN,
 					LM3533_LED_DELAY1_TSTEP,
 					LM3533_LED_DELAY1_VMIN,
 					LM3533_LED_DELAY1_VMAX);
 	}

 	*delay = (t + 500) / 1000;

 	return val;
 }

 /*
  * Set delay register base to *delay (in ms) and update *delay to reflect
  * actual hardware delay used.
  */
 static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
 							unsigned long *delay)
 {
 	unsigned t;
 	u8 val;
 	u8 reg;
 	int ret;

 	t = (unsigned)*delay;

 	/* Delay group 3 is only available for low time (delay off). */
 	if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
 		t = min(t, LM3533_LED_DELAY2_TMAX / 1000);

 	val = lm3533_led_get_hw_delay(&t);

 	dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
 							*delay, t, val);
 	reg = lm3533_led_get_pattern_reg(led, base);
 	ret = lm3533_write(led->lm3533, reg, val);
 	if (ret)
 		dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);

 	*delay = t;

 	return ret;
 }

 static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
 {
 	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
 }

 static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
 {
 	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
 }

 static int lm3533_led_blink_set(struct led_classdev *cdev,
 				unsigned long *delay_on,
 				unsigned long *delay_off)
 {
 	struct lm3533_led *led = to_lm3533_led(cdev);
 	int ret;

 	dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
 							*delay_on, *delay_off);

 	if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
 					*delay_off > LM3533_LED_DELAY_OFF_MAX)
 		return -EINVAL;

 	if (*delay_on == 0 && *delay_off == 0) {
 		*delay_on = 500;
 		*delay_off = 500;
 	}

 	ret = lm3533_led_delay_on_set(led, delay_on);
 	if (ret)
 		return ret;

 	ret = lm3533_led_delay_off_set(led, delay_off);
 	if (ret)
 		return ret;

 	return lm3533_led_pattern_enable(led, 1);
 }

 static ssize_t show_id(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);

 	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
 }

 /*
  * Pattern generator rise/fall times:
  *
  *   0 - 2048 us (default)
  *   1 - 262 ms
  *   2 - 524 ms
  *   3 - 1.049 s
  *   4 - 2.097 s
  *   5 - 4.194 s
  *   6 - 8.389 s
  *   7 - 16.78 s
  */
 static ssize_t show_risefalltime(struct device *dev,
 					struct device_attribute *attr,
 					char *buf, u8 base)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	ssize_t ret;
 	u8 reg;
 	u8 val;

 	reg = lm3533_led_get_pattern_reg(led, base);
 	ret = lm3533_read(led->lm3533, reg, &val);
 	if (ret)
 		return ret;

 	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
 }

 static ssize_t show_risetime(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	return show_risefalltime(dev, attr, buf,
 					LM3533_REG_PATTERN_RISETIME_BASE);
 }

 static ssize_t show_falltime(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	return show_risefalltime(dev, attr, buf,
 					LM3533_REG_PATTERN_FALLTIME_BASE);
 }

 static ssize_t store_risefalltime(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len, u8 base)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	u8 val;
 	u8 reg;
 	int ret;

 	if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
 		return -EINVAL;

 	reg = lm3533_led_get_pattern_reg(led, base);
 	ret = lm3533_write(led->lm3533, reg, val);
 	if (ret)
 		return ret;

 	return len;
 }

 static ssize_t store_risetime(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	return store_risefalltime(dev, attr, buf, len,
 					LM3533_REG_PATTERN_RISETIME_BASE);
 }

 static ssize_t store_falltime(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	return store_risefalltime(dev, attr, buf, len,
 					LM3533_REG_PATTERN_FALLTIME_BASE);
 }

 static ssize_t show_als_channel(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	unsigned channel;
 	u8 reg;
 	u8 val;
 	int ret;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	ret = lm3533_read(led->lm3533, reg, &val);
 	if (ret)
 		return ret;

 	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;

 	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
 }

 static ssize_t store_als_channel(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	unsigned channel;
 	u8 reg;
 	u8 val;
 	u8 mask;
 	int ret;

 	if (kstrtouint(buf, 0, &channel))
 		return -EINVAL;

 	if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
 					channel > LM3533_ALS_CHANNEL_LV_MAX)
 		return -EINVAL;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
 	val = channel - 1;

 	ret = lm3533_update(led->lm3533, reg, val, mask);
 	if (ret)
 		return ret;

 	return len;
 }

 static ssize_t show_als_en(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	bool enable;
 	u8 reg;
 	u8 val;
 	int ret;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	ret = lm3533_read(led->lm3533, reg, &val);
 	if (ret)
 		return ret;

 	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

 	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
 }

 static ssize_t store_als_en(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	unsigned enable;
 	u8 reg;
 	u8 mask;
 	u8 val;
 	int ret;

 	if (kstrtouint(buf, 0, &enable))
 		return -EINVAL;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

 	if (enable)
 		val = mask;
 	else
 		val = 0;

 	ret = lm3533_update(led->lm3533, reg, val, mask);
 	if (ret)
 		return ret;

 	return len;
 }

 static ssize_t show_linear(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	u8 reg;
 	u8 val;
 	int linear;
 	int ret;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	ret = lm3533_read(led->lm3533, reg, &val);
 	if (ret)
 		return ret;

 	if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
 		linear = 1;
 	else
 		linear = 0;

 	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
 }

 static ssize_t store_linear(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	unsigned long linear;
 	u8 reg;
 	u8 mask;
 	u8 val;
 	int ret;

 	if (kstrtoul(buf, 0, &linear))
 		return -EINVAL;

 	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
 	mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;

 	if (linear)
 		val = mask;
 	else
 		val = 0;

 	ret = lm3533_update(led->lm3533, reg, val, mask);
 	if (ret)
 		return ret;

 	return len;
 }

 static ssize_t show_pwm(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	u8 val;
 	int ret;

 	ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
 	if (ret)
 		return ret;

 	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 }

 static ssize_t store_pwm(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	u8 val;
 	int ret;

 	if (kstrtou8(buf, 0, &val))
 		return -EINVAL;

 	ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
 	if (ret)
 		return ret;

 	return len;
 }

 static LM3533_ATTR_RW(als_channel);
 static LM3533_ATTR_RW(als_en);
 static LM3533_ATTR_RW(falltime);
 static LM3533_ATTR_RO(id);
 static LM3533_ATTR_RW(linear);
 static LM3533_ATTR_RW(pwm);
 static LM3533_ATTR_RW(risetime);

 static struct attribute *lm3533_led_attributes[] = {
 	&dev_attr_als_channel.attr,
 	&dev_attr_als_en.attr,
 	&dev_attr_falltime.attr,
 	&dev_attr_id.attr,
 	&dev_attr_linear.attr,
 	&dev_attr_pwm.attr,
 	&dev_attr_risetime.attr,
 	NULL,
 };

 static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct lm3533_led *led = to_lm3533_led(led_cdev);
 	umode_t mode = attr->mode;

 	if (attr == &dev_attr_als_channel.attr ||
 					attr == &dev_attr_als_en.attr) {
 		if (!led->lm3533->have_als)
 			mode = 0;
 	}

 	return mode;
 };

 static const struct attribute_group lm3533_led_attribute_group = {
 	.is_visible	= lm3533_led_attr_is_visible,
 	.attrs		= lm3533_led_attributes
 };

 static const struct attribute_group *lm3533_led_attribute_groups[] = {
 	&lm3533_led_attribute_group,
 	NULL
 };

 static int lm3533_led_setup(struct lm3533_led *led,
 					struct lm3533_led_platform_data *pdata)
 {
 	int ret;

 	ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
 	if (ret)
 		return ret;

 	return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
 }

 static int lm3533_led_probe(struct platform_device *pdev)
 {
 	struct lm3533 *lm3533;
 	struct lm3533_led_platform_data *pdata;
 	struct lm3533_led *led;
 	int ret;

 	dev_dbg(&pdev->dev, "%s\n", __func__);

 	lm3533 = dev_get_drvdata(pdev->dev.parent);
 	if (!lm3533)
 		return -EINVAL;

 	pdata = dev_get_platdata(&pdev->dev);
 	if (!pdata) {
 		dev_err(&pdev->dev, "no platform data\n");
 		return -EINVAL;
 	}

 	if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
 		dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
 		return -EINVAL;
 	}

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

 	led->lm3533 = lm3533;
 	led->cdev.name = pdata->name;
 	led->cdev.default_trigger = pdata->default_trigger;
 	led->cdev.brightness_set_blocking = lm3533_led_set;
 	led->cdev.brightness_get = lm3533_led_get;
 	led->cdev.blink_set = lm3533_led_blink_set;
 	led->cdev.brightness = LED_OFF;
 	led->cdev.groups = lm3533_led_attribute_groups,
 	led->id = pdev->id;

 	mutex_init(&led->mutex);

 	/* The class framework makes a callback to get brightness during
 	 * registration so use parent device (for error reporting) until
 	 * registered.
 	 */
 	led->cb.lm3533 = lm3533;
 	led->cb.id = lm3533_led_get_ctrlbank_id(led);
 	led->cb.dev = lm3533->dev;

 	platform_set_drvdata(pdev, led);

 	ret = led_classdev_register(pdev->dev.parent, &led->cdev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
 		return ret;
 	}

 	led->cb.dev = led->cdev.dev;

 	ret = lm3533_led_setup(led, pdata);
 	if (ret)
 		goto err_deregister;

 	ret = lm3533_ctrlbank_enable(&led->cb);
 	if (ret)
 		goto err_deregister;

 	return 0;

 err_deregister:
 	led_classdev_unregister(&led->cdev);

 	return ret;
 }

 static int lm3533_led_remove(struct platform_device *pdev)
 {
 	struct lm3533_led *led = platform_get_drvdata(pdev);

 	dev_dbg(&pdev->dev, "%s\n", __func__);

 	lm3533_ctrlbank_disable(&led->cb);
 	led_classdev_unregister(&led->cdev);

 	return 0;
 }

 static void lm3533_led_shutdown(struct platform_device *pdev)
 {

 	struct lm3533_led *led = platform_get_drvdata(pdev);

 	dev_dbg(&pdev->dev, "%s\n", __func__);

 	lm3533_ctrlbank_disable(&led->cb);
 	lm3533_led_set(&led->cdev, LED_OFF);		/* disable blink */
 }

 static struct platform_driver lm3533_led_driver = {
 	.driver = {
 		.name = "lm3533-leds",
 	},
 	.probe		= lm3533_led_probe,
 	.remove		= lm3533_led_remove,
 	.shutdown	= lm3533_led_shutdown,
 };
 module_platform_driver(lm3533_led_driver);

 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 MODULE_DESCRIPTION("LM3533 LED driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:lm3533-leds");
	/*
	* leds-lm3533.c -- LM3533 LED driver
	*
	* Copyright (C) 2011-2012 Texas Instruments
	*
	* Author: Johan Hovold <jhovold@gmail.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*/

	#include <linux/module.h>
	#include <linux/leds.h>
	#include <linux/mfd/core.h>
	#include <linux/mutex.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>

	#include <linux/mfd/lm3533.h>


	#define LM3533_LVCTRLBANK_MIN 2
	#define LM3533_LVCTRLBANK_MAX 5
	#define LM3533_LVCTRLBANK_COUNT 4
	#define LM3533_RISEFALLTIME_MAX 7
	#define LM3533_ALS_CHANNEL_LV_MIN 1
	#define LM3533_ALS_CHANNEL_LV_MAX 2

	#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
	#define LM3533_REG_PATTERN_ENABLE 0x28
	#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
	#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
	#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
	#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75

	#define LM3533_REG_PATTERN_STEP 0x10

	#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
	#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02
	#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01

	#define LM3533_LED_FLAG_PATTERN_ENABLE 1


	struct lm3533_led {
	struct lm3533 *lm3533;
	struct lm3533_ctrlbank cb;
	struct led_classdev cdev;
	int id;

	struct mutex mutex;
	unsigned long flags;
	};


	static inline struct lm3533_led to_lm3533_led(struct led_classdev cdev)
	{
	return container_of(cdev, struct lm3533_led, cdev);
	}

	static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
	{
	return led->id + 2;
	}

	static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
	{
	return base + led->id;
	}

	static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
	{
	return led->id;
	}

	static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
	u8 base)
	{
	return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
	}

	static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
	{
	u8 mask;
	u8 val;
	int pattern;
	int state;
	int ret = 0;

	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);

	mutex_lock(&led->mutex);

	state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
	if ((enable && state) \|\| (!enable && !state))
	goto out;

	pattern = lm3533_led_get_pattern(led);
	mask = 1 << (2 * pattern);

	if (enable)
	val = mask;
	else
	val = 0;

	ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
	if (ret) {
	dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
	pattern, enable);
	goto out;
	}

	__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
	out:
	mutex_unlock(&led->mutex);

	return ret;
	}

	static int lm3533_led_set(struct led_classdev *cdev,
	enum led_brightness value)
	{
	struct lm3533_led *led = to_lm3533_led(cdev);

	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);

	if (value == 0)
	lm3533_led_pattern_enable(led, 0); /* disable blink */

	return lm3533_ctrlbank_set_brightness(&led->cb, value);
	}

	static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
	{
	struct lm3533_led *led = to_lm3533_led(cdev);
	u8 val;
	int ret;

	ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
	if (ret)
	return ret;

	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);

	return val;
	}

	/* Pattern generator defines (delays in us). */
	#define LM3533_LED_DELAY1_VMIN 0x00
	#define LM3533_LED_DELAY2_VMIN 0x3d
	#define LM3533_LED_DELAY3_VMIN 0x80

	#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1)
	#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1)
	#define LM3533_LED_DELAY3_VMAX 0xff

	#define LM3533_LED_DELAY1_TMIN 16384U
	#define LM3533_LED_DELAY2_TMIN 1130496U
	#define LM3533_LED_DELAY3_TMIN 10305536U

	#define LM3533_LED_DELAY1_TMAX 999424U
	#define LM3533_LED_DELAY2_TMAX 9781248U
	#define LM3533_LED_DELAY3_TMAX 76890112U

	/* t_step = (t_max - t_min) / (v_max - v_min) */
	#define LM3533_LED_DELAY1_TSTEP 16384
	#define LM3533_LED_DELAY2_TSTEP 131072
	#define LM3533_LED_DELAY3_TSTEP 524288

	/* Delay limits for hardware accelerated blinking (in ms). */
	#define LM3533_LED_DELAY_ON_MAX \
	((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
	#define LM3533_LED_DELAY_OFF_MAX \
	((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)

	/*
	* Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
	* size of t_step, where
	*
	* t_step = (t_max - t_min) / (v_max - v_min)
	*
	* and updates *t to reflect the mapped value.
	*/
	static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
	u8 v_min, u8 v_max)
	{
	unsigned val;

	val = (*t + t_step / 2 - t_min) / t_step + v_min;

	t = t_step (val - v_min) + t_min;

	return (u8)val;
	}

	/*
	* Returns time code corresponding to delay (in ms) and updates delay to
	* reflect actual hardware delay.
	*
	* Hardware supports 256 discrete delay times, divided into three groups with
	* the following ranges and step-sizes:
	*
	* [ 16, 999] [0x00, 0x3e] step 16 ms
	* [ 1130, 9781] [0x3d, 0x7f] step 131 ms
	* [10306, 76890] [0x80, 0xff] step 524 ms
	*
	* Note that delay group 3 is only available for delay_off.
	*/
	static u8 lm3533_led_get_hw_delay(unsigned *delay)
	{
	unsigned t;
	u8 val;

	t = delay 1000;

	if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
	t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
	val = time_to_val(&t, LM3533_LED_DELAY3_TMIN,
	LM3533_LED_DELAY3_TSTEP,
	LM3533_LED_DELAY3_VMIN,
	LM3533_LED_DELAY3_VMAX);
	} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
	t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
	val = time_to_val(&t, LM3533_LED_DELAY2_TMIN,
	LM3533_LED_DELAY2_TSTEP,
	LM3533_LED_DELAY2_VMIN,
	LM3533_LED_DELAY2_VMAX);
	} else {
	t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
	val = time_to_val(&t, LM3533_LED_DELAY1_TMIN,
	LM3533_LED_DELAY1_TSTEP,
	LM3533_LED_DELAY1_VMIN,
	LM3533_LED_DELAY1_VMAX);
	}

	*delay = (t + 500) / 1000;

	return val;
	}

	/*
	* Set delay register base to delay (in ms) and update delay to reflect
	* actual hardware delay used.
	*/
	static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
	unsigned long *delay)
	{
	unsigned t;
	u8 val;
	u8 reg;
	int ret;

	t = (unsigned)*delay;

	/* Delay group 3 is only available for low time (delay off). */
	if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
	t = min(t, LM3533_LED_DELAY2_TMAX / 1000);

	val = lm3533_led_get_hw_delay(&t);

	dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
	*delay, t, val);
	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_write(led->lm3533, reg, val);
	if (ret)
	dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);

	*delay = t;

	return ret;
	}

	static int lm3533_led_delay_on_set(struct lm3533_led led, unsigned long t)
	{
	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
	}

	static int lm3533_led_delay_off_set(struct lm3533_led led, unsigned long t)
	{
	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
	}

	static int lm3533_led_blink_set(struct led_classdev *cdev,
	unsigned long *delay_on,
	unsigned long *delay_off)
	{
	struct lm3533_led *led = to_lm3533_led(cdev);
	int ret;

	dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
	delay_on, delay_off);

	if (*delay_on > LM3533_LED_DELAY_ON_MAX \|\|
	*delay_off > LM3533_LED_DELAY_OFF_MAX)
	return -EINVAL;

	if (delay_on == 0 && delay_off == 0) {
	*delay_on = 500;
	*delay_off = 500;
	}

	ret = lm3533_led_delay_on_set(led, delay_on);
	if (ret)
	return ret;

	ret = lm3533_led_delay_off_set(led, delay_off);
	if (ret)
	return ret;

	return lm3533_led_pattern_enable(led, 1);
	}

	static ssize_t show_id(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);

	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
	}

	/*
	* Pattern generator rise/fall times:
	*
	* 0 - 2048 us (default)
	* 1 - 262 ms
	* 2 - 524 ms
	* 3 - 1.049 s
	* 4 - 2.097 s
	* 5 - 4.194 s
	* 6 - 8.389 s
	* 7 - 16.78 s
	*/
	static ssize_t show_risefalltime(struct device *dev,
	struct device_attribute *attr,
	char *buf, u8 base)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	ssize_t ret;
	u8 reg;
	u8 val;

	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
	return ret;

	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
	}

	static ssize_t show_risetime(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return show_risefalltime(dev, attr, buf,
	LM3533_REG_PATTERN_RISETIME_BASE);
	}

	static ssize_t show_falltime(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return show_risefalltime(dev, attr, buf,
	LM3533_REG_PATTERN_FALLTIME_BASE);
	}

	static ssize_t store_risefalltime(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len, u8 base)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	u8 reg;
	int ret;

	if (kstrtou8(buf, 0, &val) \|\| val > LM3533_RISEFALLTIME_MAX)
	return -EINVAL;

	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_write(led->lm3533, reg, val);
	if (ret)
	return ret;

	return len;
	}

	static ssize_t store_risetime(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_risefalltime(dev, attr, buf, len,
	LM3533_REG_PATTERN_RISETIME_BASE);
	}

	static ssize_t store_falltime(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_risefalltime(dev, attr, buf, len,
	LM3533_REG_PATTERN_FALLTIME_BASE);
	}

	static ssize_t show_als_channel(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned channel;
	u8 reg;
	u8 val;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
	return ret;

	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;

	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
	}

	static ssize_t store_als_channel(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned channel;
	u8 reg;
	u8 val;
	u8 mask;
	int ret;

	if (kstrtouint(buf, 0, &channel))
	return -EINVAL;

	if (channel < LM3533_ALS_CHANNEL_LV_MIN \|\|
	channel > LM3533_ALS_CHANNEL_LV_MAX)
	return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
	val = channel - 1;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
	return ret;

	return len;
	}

	static ssize_t show_als_en(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	bool enable;
	u8 reg;
	u8 val;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
	return ret;

	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
	}

	static ssize_t store_als_en(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned enable;
	u8 reg;
	u8 mask;
	u8 val;
	int ret;

	if (kstrtouint(buf, 0, &enable))
	return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

	if (enable)
	val = mask;
	else
	val = 0;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
	return ret;

	return len;
	}

	static ssize_t show_linear(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 reg;
	u8 val;
	int linear;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
	return ret;

	if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
	linear = 1;
	else
	linear = 0;

	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
	}

	static ssize_t store_linear(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned long linear;
	u8 reg;
	u8 mask;
	u8 val;
	int ret;

	if (kstrtoul(buf, 0, &linear))
	return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;

	if (linear)
	val = mask;
	else
	val = 0;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
	return ret;

	return len;
	}

	static ssize_t show_pwm(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	int ret;

	ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
	if (ret)
	return ret;

	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
	}

	static ssize_t store_pwm(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	int ret;

	if (kstrtou8(buf, 0, &val))
	return -EINVAL;

	ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
	if (ret)
	return ret;

	return len;
	}

	static LM3533_ATTR_RW(als_channel);
	static LM3533_ATTR_RW(als_en);
	static LM3533_ATTR_RW(falltime);
	static LM3533_ATTR_RO(id);
	static LM3533_ATTR_RW(linear);
	static LM3533_ATTR_RW(pwm);
	static LM3533_ATTR_RW(risetime);

	static struct attribute *lm3533_led_attributes[] = {
	&dev_attr_als_channel.attr,
	&dev_attr_als_en.attr,
	&dev_attr_falltime.attr,
	&dev_attr_id.attr,
	&dev_attr_linear.attr,
	&dev_attr_pwm.attr,
	&dev_attr_risetime.attr,
	NULL,
	};

	static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
	struct attribute *attr, int n)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	umode_t mode = attr->mode;

	if (attr == &dev_attr_als_channel.attr \|\|
	attr == &dev_attr_als_en.attr) {
	if (!led->lm3533->have_als)
	mode = 0;
	}

	return mode;
	};

	static const struct attribute_group lm3533_led_attribute_group = {
	.is_visible = lm3533_led_attr_is_visible,
	.attrs = lm3533_led_attributes
	};

	static const struct attribute_group *lm3533_led_attribute_groups[] = {
	&lm3533_led_attribute_group,
	NULL
	};

	static int lm3533_led_setup(struct lm3533_led *led,
	struct lm3533_led_platform_data *pdata)
	{
	int ret;

	ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
	if (ret)
	return ret;

	return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
	}

	static int lm3533_led_probe(struct platform_device *pdev)
	{
	struct lm3533 *lm3533;
	struct lm3533_led_platform_data *pdata;
	struct lm3533_led *led;
	int ret;

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533 = dev_get_drvdata(pdev->dev.parent);
	if (!lm3533)
	return -EINVAL;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata) {
	dev_err(&pdev->dev, "no platform data\n");
	return -EINVAL;
	}

	if (pdev->id < 0 \|\| pdev->id >= LM3533_LVCTRLBANK_COUNT) {
	dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
	return -EINVAL;
	}

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

	led->lm3533 = lm3533;
	led->cdev.name = pdata->name;
	led->cdev.default_trigger = pdata->default_trigger;
	led->cdev.brightness_set_blocking = lm3533_led_set;
	led->cdev.brightness_get = lm3533_led_get;
	led->cdev.blink_set = lm3533_led_blink_set;
	led->cdev.brightness = LED_OFF;
	led->cdev.groups = lm3533_led_attribute_groups,
	led->id = pdev->id;

	mutex_init(&led->mutex);

	/* The class framework makes a callback to get brightness during
	* registration so use parent device (for error reporting) until
	* registered.
	*/
	led->cb.lm3533 = lm3533;
	led->cb.id = lm3533_led_get_ctrlbank_id(led);
	led->cb.dev = lm3533->dev;

	platform_set_drvdata(pdev, led);

	ret = led_classdev_register(pdev->dev.parent, &led->cdev);
	if (ret) {
	dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
	return ret;
	}

	led->cb.dev = led->cdev.dev;

	ret = lm3533_led_setup(led, pdata);
	if (ret)
	goto err_deregister;

	ret = lm3533_ctrlbank_enable(&led->cb);
	if (ret)
	goto err_deregister;

	return 0;

	err_deregister:
	led_classdev_unregister(&led->cdev);

	return ret;
	}

	static int lm3533_led_remove(struct platform_device *pdev)
	{
	struct lm3533_led *led = platform_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533_ctrlbank_disable(&led->cb);
	led_classdev_unregister(&led->cdev);

	return 0;
	}

	static void lm3533_led_shutdown(struct platform_device *pdev)
	{

	struct lm3533_led *led = platform_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533_ctrlbank_disable(&led->cb);
	lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */
	}

	static struct platform_driver lm3533_led_driver = {
	.driver = {
	.name = "lm3533-leds",
	},
	.probe = lm3533_led_probe,
	.remove = lm3533_led_remove,
	.shutdown = lm3533_led_shutdown,
	};
	module_platform_driver(lm3533_led_driver);

	MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
	MODULE_DESCRIPTION("LM3533 LED driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:lm3533-leds");