leds-da903x.c

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/*
 * LEDs driver for Dialog Semiconductor DA9030/DA9034
 *
 * Copyright (C) 2008 Compulab, Ltd.
 *  Mike Rapoport <[email protected]>
 *
 * Copyright (C) 2006-2008 Marvell International Ltd.
 *  Eric Miao <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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/da903x.h>
#include <linux/slab.h>

#define DA9030_LED1_CONTROL 0x20
#define DA9030_LED2_CONTROL 0x21
#define DA9030_LED3_CONTROL 0x22
#define DA9030_LED4_CONTROL 0x23
#define DA9030_LEDPC_CONTROL    0x24
#define DA9030_MISC_CONTROL_A   0x26    /* Vibrator Control */

#define DA9034_LED1_CONTROL 0x35
#define DA9034_LED2_CONTROL 0x36
#define DA9034_VIBRA        0x40

struct da903x_led {
    struct led_classdev cdev;
    struct work_struct  work;
    struct device       *master;
    enum led_brightness new_brightness;
    int         id;
    int         flags;
};

#define DA9030_LED_OFFSET(id)   ((id) - DA9030_ID_LED_1)
#define DA9034_LED_OFFSET(id)   ((id) - DA9034_ID_LED_1)

static void da903x_led_work(struct work_struct *work)
{
    struct da903x_led *led = container_of(work, struct da903x_led, work);
    uint8_t val;
    int offset;

    switch (led->id) {
    case DA9030_ID_LED_1:
    case DA9030_ID_LED_2:
    case DA9030_ID_LED_3:
    case DA9030_ID_LED_4:
    case DA9030_ID_LED_PC:
        offset = DA9030_LED_OFFSET(led->id);
        val = led->flags & ~0x87;
        val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
        val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
        da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
        break;
    case DA9030_ID_VIBRA:
        val = led->flags & ~0x80;
        val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
        da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
        break;
    case DA9034_ID_LED_1:
    case DA9034_ID_LED_2:
        offset = DA9034_LED_OFFSET(led->id);
        val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
        val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
        da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
        break;
    case DA9034_ID_VIBRA:
        val = led->new_brightness & 0xfe;
        da903x_write(led->master, DA9034_VIBRA, val);
        break;
    }
}

static void da903x_led_set(struct led_classdev *led_cdev,
               enum led_brightness value)
{
    struct da903x_led *led;
    
    led = container_of(led_cdev, struct da903x_led, cdev);
    led->new_brightness = value;
    schedule_work(&led->work);
}

static int __devinit da903x_led_probe(struct platform_device *pdev)
{
    struct led_info *pdata = pdev->dev.platform_data;
    struct da903x_led *led;
    int id, ret;

    if (pdata == NULL)
        return 0;

    id = pdev->id;

    if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
          (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
        dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
        return -EINVAL;
    }

    led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
    if (led == NULL) {
        dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
        return -ENOMEM;
    }

    led->cdev.name = pdata->name;
    led->cdev.default_trigger = pdata->default_trigger;
    led->cdev.brightness_set = da903x_led_set;
    led->cdev.brightness = LED_OFF;

    led->id = id;
    led->flags = pdata->flags;
    led->master = pdev->dev.parent;
    led->new_brightness = LED_OFF;

    INIT_WORK(&led->work, da903x_led_work);

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

    platform_set_drvdata(pdev, led);
    return 0;
}

static int __devexit da903x_led_remove(struct platform_device *pdev)
{
    struct da903x_led *led = platform_get_drvdata(pdev);

    led_classdev_unregister(&led->cdev);
    return 0;
}

static struct platform_driver da903x_led_driver = {
    .driver = {
        .name   = "da903x-led",
        .owner  = THIS_MODULE,
    },
    .probe      = da903x_led_probe,
    .remove     = __devexit_p(da903x_led_remove),
};

module_platform_driver(da903x_led_driver);

MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
MODULE_AUTHOR("Eric Miao <[email protected]>"
          "Mike Rapoport <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da903x-led");