nvec_paz00.c

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/*
 * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
 *
 * Copyright (C) 2011 The AC100 Kernel Team <[email protected]>
 *
 * Authors:  Ilya Petrov <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include "nvec.h"

#define to_nvec_led(led_cdev) \
    container_of(led_cdev, struct nvec_led, cdev)

#define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}

#define NVEC_LED_MAX 8

struct nvec_led {
    struct led_classdev cdev;
    struct nvec_chip *nvec;
};

static void nvec_led_brightness_set(struct led_classdev *led_cdev,
                    enum led_brightness value)
{
    struct nvec_led *led = to_nvec_led(led_cdev);
    unsigned char buf[] = NVEC_LED_REQ;
    buf[4] = value;

    nvec_write_async(led->nvec, buf, sizeof(buf));

    led->cdev.brightness = value;

}

static int __devinit nvec_paz00_probe(struct platform_device *pdev)
{
    struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
    struct nvec_led *led;
    int ret = 0;

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

    led->cdev.max_brightness = NVEC_LED_MAX;

    led->cdev.brightness_set = nvec_led_brightness_set;
    led->cdev.name = "paz00-led";
    led->cdev.flags |= LED_CORE_SUSPENDRESUME;
    led->nvec = nvec;

    platform_set_drvdata(pdev, led);

    ret = led_classdev_register(&pdev->dev, &led->cdev);
    if (ret < 0)
        return ret;

    /* to expose the default value to userspace */
    led->cdev.brightness = 0;

    return 0;
}

static int __devexit nvec_paz00_remove(struct platform_device *pdev)
{
    struct nvec_led *led = platform_get_drvdata(pdev);

    led_classdev_unregister(&led->cdev);

    return 0;
}

static struct platform_driver nvec_paz00_driver = {
    .probe  = nvec_paz00_probe,
    .remove = __devexit_p(nvec_paz00_remove),
    .driver = {
        .name  = "nvec-paz00",
        .owner = THIS_MODULE,
    },
};

module_platform_driver(nvec_paz00_driver);

MODULE_AUTHOR("Ilya Petrov <[email protected]>");
MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nvec-paz00");