linux-imx

/*

 * MSI GT683R led driver

 *

 * Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

​

#include <linux/device.h>

#include <linux/hid.h>

#include <linux/kernel.h>

#include <linux/leds.h>

#include <linux/module.h>

​

#include "hid-ids.h"

​

#define GT683R_BUFFER_SIZE          8

​

/*

 * GT683R_LED_OFF: all LEDs are off

 * GT683R_LED_AUDIO: LEDs brightness depends on sound level

 * GT683R_LED_BREATHING: LEDs brightness varies at human breathing rate

 * GT683R_LED_NORMAL: LEDs are fully on when enabled

 */

enum gt683r_led_mode {

    GT683R_LED_OFF = 0,

    GT683R_LED_AUDIO = 2,

    GT683R_LED_BREATHING = 3,

    GT683R_LED_NORMAL = 5

};

​

enum gt683r_panels {

    GT683R_LED_BACK = 0,

    GT683R_LED_SIDE = 1,

    GT683R_LED_FRONT = 2,

    GT683R_LED_COUNT,

};

​

static const char * const gt683r_panel_names[] = {

    "back",

    "side",

    "front",

};

​

struct gt683r_led {

    struct hid_device *hdev;

    struct led_classdev led_devs[GT683R_LED_COUNT];

    struct mutex lock;

    struct work_struct work;

    enum led_brightness brightnesses[GT683R_LED_COUNT];

    enum gt683r_led_mode mode;

};

​

static const struct hid_device_id gt683r_led_id[] = {

    { HID_USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },

    { }

};

​

static void gt683r_brightness_set(struct led_classdev *led_cdev,

                enum led_brightness brightness)

{

    int i;

    struct device *dev = led_cdev->dev->parent;

    struct hid_device *hdev = to_hid_device(dev);

    struct gt683r_led *led = hid_get_drvdata(hdev);

​

    for (i = 0; i < GT683R_LED_COUNT; i++) {

        if (led_cdev == &led->led_devs[i])

            break;

    }

​

    if (i < GT683R_LED_COUNT) {

        led->brightnesses[i] = brightness;

        schedule_work(&led->work);

    }

}

​

static ssize_t mode_show(struct device *dev,

                struct device_attribute *attr,

                char *buf)

{

    u8 sysfs_mode;

    struct hid_device *hdev = to_hid_device(dev->parent);