leds-adp5520.c

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/*
 * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
 *
 * Copyright 2009 Analog Devices Inc.
 *
 * Loosely derived from leds-da903x:
 * Copyright (C) 2008 Compulab, Ltd.
 *  Mike Rapoport <[email protected]>
 *
 * Copyright (C) 2006-2008 Marvell International Ltd.
 *  Eric Miao <[email protected]>
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/mfd/adp5520.h>
#include <linux/slab.h>

struct adp5520_led {
    struct led_classdev cdev;
    struct work_struct  work;
    struct device       *master;
    enum led_brightness new_brightness;
    int         id;
    int         flags;
};

static void adp5520_led_work(struct work_struct *work)
{
    struct adp5520_led *led = container_of(work, struct adp5520_led, work);
    adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
             led->new_brightness >> 2);
}

static void adp5520_led_set(struct led_classdev *led_cdev,
               enum led_brightness value)
{
    struct adp5520_led *led;

    led = container_of(led_cdev, struct adp5520_led, cdev);
    led->new_brightness = value;
    schedule_work(&led->work);
}

static int adp5520_led_setup(struct adp5520_led *led)
{
    struct device *dev = led->master;
    int flags = led->flags;
    int ret = 0;

    switch (led->id) {
    case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
        ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
                    (flags >> ADP5520_FLAG_OFFT_SHIFT) &
                    ADP5520_FLAG_OFFT_MASK);
        ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
                    ADP5520_LED1_EN);
        break;
    case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
        ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
                    ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
                    ADP5520_FLAG_OFFT_MASK) << 2);
        ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
                     ADP5520_R3_MODE);
        ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
                    ADP5520_LED2_EN);
        break;
    case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
        ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
                    ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
                    ADP5520_FLAG_OFFT_MASK) << 4);
        ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
                    ADP5520_C3_MODE);
        ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
                    ADP5520_LED3_EN);
        break;
    }

    return ret;
}

static int __devinit adp5520_led_prepare(struct platform_device *pdev)
{
    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
    struct device *dev = pdev->dev.parent;
    int ret = 0;

    ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
    ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
    ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
    ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
    ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
         pdata->fade_out));

    return ret;
}

static int __devinit adp5520_led_probe(struct platform_device *pdev)
{
    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
    struct adp5520_led *led, *led_dat;
    struct led_info *cur_led;
    int ret, i;

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

    if (pdata->num_leds > ADP5520_01_MAXLEDS) {
        dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
                 ADP5520_01_MAXLEDS);
        return -EFAULT;
    }

    led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
                GFP_KERNEL);
    if (led == NULL) {
        dev_err(&pdev->dev, "failed to alloc memory\n");
        return -ENOMEM;
    }

    ret = adp5520_led_prepare(pdev);

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

    for (i = 0; i < pdata->num_leds; ++i) {
        cur_led = &pdata->leds[i];
        led_dat = &led[i];

        led_dat->cdev.name = cur_led->name;
        led_dat->cdev.default_trigger = cur_led->default_trigger;
        led_dat->cdev.brightness_set = adp5520_led_set;
        led_dat->cdev.brightness = LED_OFF;

        if (cur_led->flags & ADP5520_FLAG_LED_MASK)
            led_dat->flags = cur_led->flags;
        else
            led_dat->flags = i + 1;

        led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;

        led_dat->master = pdev->dev.parent;
        led_dat->new_brightness = LED_OFF;

        INIT_WORK(&led_dat->work, adp5520_led_work);

        ret = led_classdev_register(led_dat->master, &led_dat->cdev);
        if (ret) {
            dev_err(&pdev->dev, "failed to register LED %d\n",
                led_dat->id);
            goto err;
        }

        ret = adp5520_led_setup(led_dat);
        if (ret) {
            dev_err(&pdev->dev, "failed to write\n");
            i++;
            goto err;
        }
    }

    platform_set_drvdata(pdev, led);
    return 0;

err:
    if (i > 0) {
        for (i = i - 1; i >= 0; i--) {
            led_classdev_unregister(&led[i].cdev);
            cancel_work_sync(&led[i].work);
        }
    }

    return ret;
}

static int __devexit adp5520_led_remove(struct platform_device *pdev)
{
    struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
    struct adp5520_led *led;
    int i;

    led = platform_get_drvdata(pdev);

    adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
         ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);

    for (i = 0; i < pdata->num_leds; i++) {
        led_classdev_unregister(&led[i].cdev);
        cancel_work_sync(&led[i].work);
    }

    return 0;
}

static struct platform_driver adp5520_led_driver = {
    .driver = {
        .name   = "adp5520-led",
        .owner  = THIS_MODULE,
    },
    .probe      = adp5520_led_probe,
    .remove     = __devexit_p(adp5520_led_remove),
};

module_platform_driver(adp5520_led_driver);

MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-led");