[linux-2.6-block.git] / drivers / leds / leds-lm3533.c

/*
 * 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 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 = devm_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)
		return ret;

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

	return 0;
}

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);

	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");
Commit	Line	Data
401dea7f JH	1	/*
	2	* leds-lm3533.c -- LM3533 LED driver
	3	*
	4	* Copyright (C) 2011-2012 Texas Instruments
	5	*
	6	* Author: Johan Hovold <jhovold@gmail.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/module.h>
401dea7f JH	15	#include <linux/leds.h>
	16	#include <linux/mfd/core.h>
	17	#include <linux/mutex.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/slab.h>
401dea7f JH	20
	21	#include <linux/mfd/lm3533.h>
	22
	23
	24	#define LM3533_LVCTRLBANK_MIN 2
	25	#define LM3533_LVCTRLBANK_MAX 5
	26	#define LM3533_LVCTRLBANK_COUNT 4
	27	#define LM3533_RISEFALLTIME_MAX 7
	28	#define LM3533_ALS_CHANNEL_LV_MIN 1
	29	#define LM3533_ALS_CHANNEL_LV_MAX 2
	30
	31	#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
	32	#define LM3533_REG_PATTERN_ENABLE 0x28
	33	#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
	34	#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
	35	#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
	36	#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75
	37
	38	#define LM3533_REG_PATTERN_STEP 0x10
	39
	40	#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
	41	#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02
	42	#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01
	43
	44	#define LM3533_LED_FLAG_PATTERN_ENABLE 1
	45
	46
	47	struct lm3533_led {
	48	struct lm3533 *lm3533;
	49	struct lm3533_ctrlbank cb;
	50	struct led_classdev cdev;
	51	int id;
	52
	53	struct mutex mutex;
	54	unsigned long flags;
401dea7f JH	55	};
	56
	57
	58	static inline struct lm3533_led to_lm3533_led(struct led_classdev cdev)
	59	{
	60	return container_of(cdev, struct lm3533_led, cdev);
	61	}
	62
	63	static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
	64	{
	65	return led->id + 2;
	66	}
	67
	68	static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
	69	{
	70	return base + led->id;
	71	}
	72
	73	static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
	74	{
	75	return led->id;
	76	}
	77
	78	static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
	79	u8 base)
	80	{
	81	return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
	82	}
	83
	84	static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
	85	{
	86	u8 mask;
	87	u8 val;
	88	int pattern;
	89	int state;
	90	int ret = 0;
	91
	92	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
	93
	94	mutex_lock(&led->mutex);
	95
	96	state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
	97	if ((enable && state) \|\| (!enable && !state))
	98	goto out;
	99
	100	pattern = lm3533_led_get_pattern(led);
	101	mask = 1 << (2 * pattern);
	102
	103	if (enable)
	104	val = mask;
	105	else
	106	val = 0;
	107
	108	ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
	109	if (ret) {
	110	dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
	111	pattern, enable);
	112	goto out;
	113	}
	114
	115	__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
	116	out:
	117	mutex_unlock(&led->mutex);
	118
119	return ret;
120	}
121
a478851c	122	static int lm3533_led_set(struct led_classdev *cdev,
401dea7f JH	123	enum led_brightness value)
	124	{
	125	struct lm3533_led *led = to_lm3533_led(cdev);
	126
	127	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
	128
a478851c AL	129	if (value == 0)
	130	lm3533_led_pattern_enable(led, 0); /* disable blink */
	131
	132	return lm3533_ctrlbank_set_brightness(&led->cb, value);
401dea7f JH	133	}
	134
	135	static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
	136	{
	137	struct lm3533_led *led = to_lm3533_led(cdev);
	138	u8 val;
	139	int ret;
	140
	141	ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
	142	if (ret)
	143	return ret;
	144
	145	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
	146
	147	return val;
	148	}
	149
	150	/* Pattern generator defines (delays in us). */
	151	#define LM3533_LED_DELAY1_VMIN 0x00
	152	#define LM3533_LED_DELAY2_VMIN 0x3d
	153	#define LM3533_LED_DELAY3_VMIN 0x80
	154
	155	#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1)
	156	#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1)
	157	#define LM3533_LED_DELAY3_VMAX 0xff
	158
	159	#define LM3533_LED_DELAY1_TMIN 16384U
	160	#define LM3533_LED_DELAY2_TMIN 1130496U
	161	#define LM3533_LED_DELAY3_TMIN 10305536U
	162
	163	#define LM3533_LED_DELAY1_TMAX 999424U
	164	#define LM3533_LED_DELAY2_TMAX 9781248U
	165	#define LM3533_LED_DELAY3_TMAX 76890112U
	166
	167	/* t_step = (t_max - t_min) / (v_max - v_min) */
	168	#define LM3533_LED_DELAY1_TSTEP 16384
	169	#define LM3533_LED_DELAY2_TSTEP 131072
	170	#define LM3533_LED_DELAY3_TSTEP 524288
	171
	172	/* Delay limits for hardware accelerated blinking (in ms). */
	173	#define LM3533_LED_DELAY_ON_MAX \
	174	((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
	175	#define LM3533_LED_DELAY_OFF_MAX \
	176	((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
	177
	178	/*
	179	* Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
	180	* size of t_step, where
	181	*
	182	* t_step = (t_max - t_min) / (v_max - v_min)
	183	*
	184	* and updates *t to reflect the mapped value.
	185	*/
	186	static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
	187	u8 v_min, u8 v_max)
	188	{
	189	unsigned val;
	190
	191	val = (*t + t_step / 2 - t_min) / t_step + v_min;
	192
	193	t = t_step (val - v_min) + t_min;
	194
	195	return (u8)val;
	196	}
197
198	/*
199	* Returns time code corresponding to delay (in ms) and updates delay to
200	* reflect actual hardware delay.
201	*
202	* Hardware supports 256 discrete delay times, divided into three groups with
203	* the following ranges and step-sizes:
204	*
205	* [ 16, 999] [0x00, 0x3e] step 16 ms
206	* [ 1130, 9781] [0x3d, 0x7f] step 131 ms
207	* [10306, 76890] [0x80, 0xff] step 524 ms
208	*
209	* Note that delay group 3 is only available for delay_off.
210	*/
211	static u8 lm3533_led_get_hw_delay(unsigned *delay)
212	{
213	unsigned t;
214	u8 val;
215
216	t = delay 1000;
217
218	if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
219	t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
220	val = time_to_val(&t, LM3533_LED_DELAY3_TMIN,
221	LM3533_LED_DELAY3_TSTEP,
222	LM3533_LED_DELAY3_VMIN,
223	LM3533_LED_DELAY3_VMAX);
224	} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
225	t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
226	val = time_to_val(&t, LM3533_LED_DELAY2_TMIN,
227	LM3533_LED_DELAY2_TSTEP,
228	LM3533_LED_DELAY2_VMIN,
229	LM3533_LED_DELAY2_VMAX);
230	} else {
231	t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
232	val = time_to_val(&t, LM3533_LED_DELAY1_TMIN,
233	LM3533_LED_DELAY1_TSTEP,
234	LM3533_LED_DELAY1_VMIN,
235	LM3533_LED_DELAY1_VMAX);
236	}
237
238	*delay = (t + 500) / 1000;
239
240	return val;
241	}
242
243	/*
244	* Set delay register base to delay (in ms) and update delay to reflect
245	* actual hardware delay used.
246	*/
247	static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
248	unsigned long *delay)
249	{
250	unsigned t;
251	u8 val;
252	u8 reg;
253	int ret;
254
255	t = (unsigned)*delay;
256
257	/* Delay group 3 is only available for low time (delay off). */
258	if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
259	t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
260
261	val = lm3533_led_get_hw_delay(&t);
262
263	dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
264	*delay, t, val);
265	reg = lm3533_led_get_pattern_reg(led, base);
266	ret = lm3533_write(led->lm3533, reg, val);
267	if (ret)
268	dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
269
270	*delay = t;
271
272	return ret;
273	}
274
275	static int lm3533_led_delay_on_set(struct lm3533_led led, unsigned long t)
276	{
277	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
278	}
279
280	static int lm3533_led_delay_off_set(struct lm3533_led led, unsigned long t)
281	{
282	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
283	}
284
285	static int lm3533_led_blink_set(struct led_classdev *cdev,
286	unsigned long *delay_on,
287	unsigned long *delay_off)
288	{
289	struct lm3533_led *led = to_lm3533_led(cdev);
290	int ret;
291
292	dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
293	delay_on, delay_off);
294
295	if (*delay_on > LM3533_LED_DELAY_ON_MAX \|\|
296	*delay_off > LM3533_LED_DELAY_OFF_MAX)
297	return -EINVAL;
298
299	if (delay_on == 0 && delay_off == 0) {
300	*delay_on = 500;
301	*delay_off = 500;
302	}
303
304	ret = lm3533_led_delay_on_set(led, delay_on);
305	if (ret)
306	return ret;
307
308	ret = lm3533_led_delay_off_set(led, delay_off);
309	if (ret)
310	return ret;
311
312	return lm3533_led_pattern_enable(led, 1);
313	}
314
315	static ssize_t show_id(struct device *dev,
316	struct device_attribute attr, char buf)
317	{
318	struct led_classdev *led_cdev = dev_get_drvdata(dev);
319	struct lm3533_led *led = to_lm3533_led(led_cdev);
320
321	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
322	}
323
324	/*
325	* Pattern generator rise/fall times:
326	*
327	* 0 - 2048 us (default)
328	* 1 - 262 ms
329	* 2 - 524 ms
330	* 3 - 1.049 s
331	* 4 - 2.097 s
332	* 5 - 4.194 s
333	* 6 - 8.389 s
334	* 7 - 16.78 s
335	*/
336	static ssize_t show_risefalltime(struct device *dev,
337	struct device_attribute *attr,
338	char *buf, u8 base)
339	{
340	struct led_classdev *led_cdev = dev_get_drvdata(dev);
341	struct lm3533_led *led = to_lm3533_led(led_cdev);
342	ssize_t ret;
343	u8 reg;
344	u8 val;
345
346	reg = lm3533_led_get_pattern_reg(led, base);
347	ret = lm3533_read(led->lm3533, reg, &val);
348	if (ret)
349	return ret;
350
351	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
352	}
353
354	static ssize_t show_risetime(struct device *dev,
355	struct device_attribute attr, char buf)
356	{
357	return show_risefalltime(dev, attr, buf,
358	LM3533_REG_PATTERN_RISETIME_BASE);
359	}
360
361	static ssize_t show_falltime(struct device *dev,
362	struct device_attribute attr, char buf)
363	{
364	return show_risefalltime(dev, attr, buf,
365	LM3533_REG_PATTERN_FALLTIME_BASE);
366	}
367
368	static ssize_t store_risefalltime(struct device *dev,
369	struct device_attribute *attr,
370	const char *buf, size_t len, u8 base)
371	{
372	struct led_classdev *led_cdev = dev_get_drvdata(dev);
373	struct lm3533_led *led = to_lm3533_led(led_cdev);
374	u8 val;
375	u8 reg;
376	int ret;
377
378	if (kstrtou8(buf, 0, &val) \|\| val > LM3533_RISEFALLTIME_MAX)
379	return -EINVAL;
380
381	reg = lm3533_led_get_pattern_reg(led, base);
382	ret = lm3533_write(led->lm3533, reg, val);
383	if (ret)
384	return ret;
385
386	return len;
387	}
388
389	static ssize_t store_risetime(struct device *dev,
390	struct device_attribute *attr,
391	const char *buf, size_t len)
392	{
393	return store_risefalltime(dev, attr, buf, len,
394	LM3533_REG_PATTERN_RISETIME_BASE);
395	}
396
397	static ssize_t store_falltime(struct device *dev,
398	struct device_attribute *attr,
399	const char *buf, size_t len)
400	{
401	return store_risefalltime(dev, attr, buf, len,
402	LM3533_REG_PATTERN_FALLTIME_BASE);
403	}
404
405	static ssize_t show_als_channel(struct device *dev,
406	struct device_attribute attr, char buf)
407	{
408	struct led_classdev *led_cdev = dev_get_drvdata(dev);
409	struct lm3533_led *led = to_lm3533_led(led_cdev);
410	unsigned channel;
411	u8 reg;
412	u8 val;
413	int ret;
414
415	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
416	ret = lm3533_read(led->lm3533, reg, &val);
417	if (ret)
418	return ret;
419
420	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
421
422	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
423	}
424
425	static ssize_t store_als_channel(struct device *dev,
426	struct device_attribute *attr,
427	const char *buf, size_t len)
428	{
429	struct led_classdev *led_cdev = dev_get_drvdata(dev);
430	struct lm3533_led *led = to_lm3533_led(led_cdev);
431	unsigned channel;
432	u8 reg;
433	u8 val;
434	u8 mask;
435	int ret;
436
437	if (kstrtouint(buf, 0, &channel))
438	return -EINVAL;
439
440	if (channel < LM3533_ALS_CHANNEL_LV_MIN \|\|
441	channel > LM3533_ALS_CHANNEL_LV_MAX)
442	return -EINVAL;
443
444	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
445	mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
446	val = channel - 1;
447
448	ret = lm3533_update(led->lm3533, reg, val, mask);
449	if (ret)
450	return ret;
451
452	return len;
453	}
454
455	static ssize_t show_als_en(struct device *dev,
456	struct device_attribute attr, char buf)
457	{
458	struct led_classdev *led_cdev = dev_get_drvdata(dev);
459	struct lm3533_led *led = to_lm3533_led(led_cdev);
460	bool enable;
461	u8 reg;
462	u8 val;
463	int ret;
464
465	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
466	ret = lm3533_read(led->lm3533, reg, &val);
467	if (ret)
468	return ret;
469
470	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
471
472	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
473	}
474
475	static ssize_t store_als_en(struct device *dev,
476	struct device_attribute *attr,
477	const char *buf, size_t len)
478	{
479	struct led_classdev *led_cdev = dev_get_drvdata(dev);
480	struct lm3533_led *led = to_lm3533_led(led_cdev);
481	unsigned enable;
482	u8 reg;
483	u8 mask;
484	u8 val;
485	int ret;
486
487	if (kstrtouint(buf, 0, &enable))
488	return -EINVAL;
489
490	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
491	mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
492
493	if (enable)
494	val = mask;
495	else
496	val = 0;
497
498	ret = lm3533_update(led->lm3533, reg, val, mask);
499	if (ret)
500	return ret;
501
502	return len;
503	}
504
505	static ssize_t show_linear(struct device *dev,
506	struct device_attribute attr, char buf)
507	{
508	struct led_classdev *led_cdev = dev_get_drvdata(dev);
509	struct lm3533_led *led = to_lm3533_led(led_cdev);
510	u8 reg;
511	u8 val;
512	int linear;
513	int ret;
514
515	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
516	ret = lm3533_read(led->lm3533, reg, &val);
517	if (ret)
518	return ret;
519
520	if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
521	linear = 1;
522	else
523	linear = 0;
524
525	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
526	}
527
528	static ssize_t store_linear(struct device *dev,
529	struct device_attribute *attr,
530	const char *buf, size_t len)
531	{
532	struct led_classdev *led_cdev = dev_get_drvdata(dev);
533	struct lm3533_led *led = to_lm3533_led(led_cdev);
534	unsigned long linear;
535	u8 reg;
536	u8 mask;
537	u8 val;
538	int ret;
539
540	if (kstrtoul(buf, 0, &linear))
541	return -EINVAL;
542
543	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
544	mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
545
546	if (linear)
547	val = mask;
548	else
549	val = 0;
550
551	ret = lm3533_update(led->lm3533, reg, val, mask);
552	if (ret)
553	return ret;
554
555	return len;
556	}
557
558	static ssize_t show_pwm(struct device *dev,
559	struct device_attribute *attr,
560	char *buf)
561	{
562	struct led_classdev *led_cdev = dev_get_drvdata(dev);
563	struct lm3533_led *led = to_lm3533_led(led_cdev);
564	u8 val;
565	int ret;
566
567	ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
568	if (ret)
569	return ret;
570
571	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
572	}
573
574	static ssize_t store_pwm(struct device *dev,
575	struct device_attribute *attr,
576	const char *buf, size_t len)
577	{
578	struct led_classdev *led_cdev = dev_get_drvdata(dev);
579	struct lm3533_led *led = to_lm3533_led(led_cdev);
580	u8 val;
581	int ret;
582
583	if (kstrtou8(buf, 0, &val))
584	return -EINVAL;
585
586	ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
587	if (ret)
588	return ret;
589
590	return len;
591	}
592
593	static LM3533_ATTR_RW(als_channel);
594	static LM3533_ATTR_RW(als_en);
595	static LM3533_ATTR_RW(falltime);
596	static LM3533_ATTR_RO(id);
597	static LM3533_ATTR_RW(linear);
598	static LM3533_ATTR_RW(pwm);
599	static LM3533_ATTR_RW(risetime);
600
601	static struct attribute *lm3533_led_attributes[] = {
602	&dev_attr_als_channel.attr,
603	&dev_attr_als_en.attr,
604	&dev_attr_falltime.attr,
605	&dev_attr_id.attr,
606	&dev_attr_linear.attr,
607	&dev_attr_pwm.attr,
608	&dev_attr_risetime.attr,
609	NULL,
610	};
611
612	static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
613	struct attribute *attr, int n)
614	{
615	struct device *dev = container_of(kobj, struct device, kobj);
616	struct led_classdev *led_cdev = dev_get_drvdata(dev);
617	struct lm3533_led *led = to_lm3533_led(led_cdev);
618	umode_t mode = attr->mode;
619
620	if (attr == &dev_attr_als_channel.attr \|\|
621	attr == &dev_attr_als_en.attr) {
622	if (!led->lm3533->have_als)
623	mode = 0;
624	}
625
626	return mode;
627	};
628
629	static struct attribute_group lm3533_led_attribute_group = {
630	.is_visible = lm3533_led_attr_is_visible,
631	.attrs = lm3533_led_attributes
632	};
633
9db93860 JH	634	static const struct attribute_group *lm3533_led_attribute_groups[] = {
	635	&lm3533_led_attribute_group,
	636	NULL
	637	};
	638
98ea1ea2	639	static int lm3533_led_setup(struct lm3533_led *led,
401dea7f JH	640	struct lm3533_led_platform_data *pdata)
	641	{
	642	int ret;
	643
	644	ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
	645	if (ret)
	646	return ret;
	647
	648	return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
	649	}
	650
98ea1ea2	651	static int lm3533_led_probe(struct platform_device *pdev)
401dea7f JH	652	{
	653	struct lm3533 *lm3533;
	654	struct lm3533_led_platform_data *pdata;
	655	struct lm3533_led *led;
	656	int ret;
	657
	658	dev_dbg(&pdev->dev, "%s\n", __func__);
	659
	660	lm3533 = dev_get_drvdata(pdev->dev.parent);
	661	if (!lm3533)
	662	return -EINVAL;
	663
87aae1ea	664	pdata = dev_get_platdata(&pdev->dev);
401dea7f JH	665	if (!pdata) {
	666	dev_err(&pdev->dev, "no platform data\n");
	667	return -EINVAL;
	668	}
	669
	670	if (pdev->id < 0 \|\| pdev->id >= LM3533_LVCTRLBANK_COUNT) {
	671	dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
	672	return -EINVAL;
	673	}
	674
	675	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
	676	if (!led)
	677	return -ENOMEM;
	678
	679	led->lm3533 = lm3533;
	680	led->cdev.name = pdata->name;
	681	led->cdev.default_trigger = pdata->default_trigger;
a478851c	682	led->cdev.brightness_set_blocking = lm3533_led_set;
401dea7f JH	683	led->cdev.brightness_get = lm3533_led_get;
	684	led->cdev.blink_set = lm3533_led_blink_set;
	685	led->cdev.brightness = LED_OFF;
9db93860	686	led->cdev.groups = lm3533_led_attribute_groups,
401dea7f JH	687	led->id = pdev->id;
	688
	689	mutex_init(&led->mutex);
401dea7f JH	690
	691	/* The class framework makes a callback to get brightness during
	692	* registration so use parent device (for error reporting) until
	693	* registered.
	694	*/
	695	led->cb.lm3533 = lm3533;
	696	led->cb.id = lm3533_led_get_ctrlbank_id(led);
	697	led->cb.dev = lm3533->dev;
	698
	699	platform_set_drvdata(pdev, led);
	700
50154e29	701	ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev);
401dea7f JH	702	if (ret) {
	703	dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
	704	return ret;
	705	}
	706
	707	led->cb.dev = led->cdev.dev;
	708
401dea7f JH	709	ret = lm3533_led_setup(led, pdata);
401dea7f JH	710	if (ret)
50154e29	711	return ret;
401dea7f JH	712
	713	ret = lm3533_ctrlbank_enable(&led->cb);
	714	if (ret)
50154e29	715	return ret;
401dea7f JH	716
401dea7f JH	717	return 0;
401dea7f JH	718	}
401dea7f JH	719
678e8a6b	720	static int lm3533_led_remove(struct platform_device *pdev)
401dea7f JH	721	{
	722	struct lm3533_led *led = platform_get_drvdata(pdev);
	723
	724	dev_dbg(&pdev->dev, "%s\n", __func__);
	725
	726	lm3533_ctrlbank_disable(&led->cb);
401dea7f JH	727
	728	return 0;
	729	}
	730
	731	static void lm3533_led_shutdown(struct platform_device *pdev)
	732	{
	733
	734	struct lm3533_led *led = platform_get_drvdata(pdev);
	735
	736	dev_dbg(&pdev->dev, "%s\n", __func__);
	737
	738	lm3533_ctrlbank_disable(&led->cb);
	739	lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */
401dea7f JH	740	}
	741
	742	static struct platform_driver lm3533_led_driver = {
	743	.driver = {
	744	.name = "lm3533-leds",
401dea7f JH	745	},
401dea7f JH	746	.probe = lm3533_led_probe,
df07cf81	747	.remove = lm3533_led_remove,
401dea7f JH	748	.shutdown = lm3533_led_shutdown,
	749	};
	750	module_platform_driver(lm3533_led_driver);
	751
	752	MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
	753	MODULE_DESCRIPTION("LM3533 LED driver");
	754	MODULE_LICENSE("GPL");
	755	MODULE_ALIAS("platform:lm3533-leds");