leds-lm3533.c

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/*
 * leds-lm3533.c -- LM3533 LED driver
 *
 * Copyright (C) 2011-2012 Texas Instruments
 *
 * Author: Johan Hovold <[email protected]>
 *
 * 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/init.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/workqueue.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;

    struct work_struct work;
    u8 new_brightness;
};


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 void lm3533_led_work(struct work_struct *work)
{
    struct lm3533_led *led = container_of(work, struct lm3533_led, work);

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

    if (led->new_brightness == 0)
        lm3533_led_pattern_enable(led, 0);  /* disable blink */

    lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
}

static void 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);

    led->new_brightness = value;
    schedule_work(&led->work);
}

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 int __devinit 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 __devinit 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 = pdev->dev.platform_data;
    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 = lm3533_led_set;
    led->cdev.brightness_get = lm3533_led_get;
    led->cdev.blink_set = lm3533_led_blink_set;
    led->cdev.brightness = LED_OFF;
    led->id = pdev->id;

    mutex_init(&led->mutex);
    INIT_WORK(&led->work, lm3533_led_work);

    /* 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 = sysfs_create_group(&led->cdev.dev->kobj,
                        &lm3533_led_attribute_group);
    if (ret < 0) {
        dev_err(&pdev->dev, "failed to create sysfs attributes\n");
        goto err_unregister;
    }

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

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

    return 0;

err_sysfs_remove:
    sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
err_unregister:
    led_classdev_unregister(&led->cdev);
    flush_work(&led->work);

    return ret;
}

static int __devexit 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);
    sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
    led_classdev_unregister(&led->cdev);
    flush_work(&led->work);

    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 */
    flush_work(&led->work);
}

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

MODULE_AUTHOR("Johan Hovold <[email protected]>");
MODULE_DESCRIPTION("LM3533 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-leds");