LXR linux/drivers/staging/nvec/nvec

   1/*
   2 * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
   3 *
   4 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
   5 *
   6 * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
   7 *
   8 * This file is subject to the terms and conditions of the GNU General Public
   9 * License.  See the file "COPYING" in the main directory of this archive
  10 * for more details.
  11 *
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/err.h>
  16#include <linux/slab.h>
  17#include <linux/leds.h>
  18#include <linux/platform_device.h>
  19#include "nvec.h"
  20
  21#define to_nvec_led(led_cdev) \
  22        container_of(led_cdev, struct nvec_led, cdev)
  23
  24#define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
  25
  26#define NVEC_LED_MAX 8
  27
  28struct nvec_led {
  29        struct led_classdev cdev;
  30        struct nvec_chip *nvec;
  31};
  32
  33static void nvec_led_brightness_set(struct led_classdev *led_cdev,
  34                                    enum led_brightness value)
  35{
  36        struct nvec_led *led = to_nvec_led(led_cdev);
  37        unsigned char buf[] = NVEC_LED_REQ;
  38        buf[4] = value;
  39
  40        nvec_write_async(led->nvec, buf, sizeof(buf));
  41
  42        led->cdev.brightness = value;
  43
  44}
  45
  46static int nvec_paz00_probe(struct platform_device *pdev)
  47{
  48        struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
  49        struct nvec_led *led;
  50        int ret = 0;
  51
  52        led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
  53        if (led == NULL)
  54                return -ENOMEM;
  55
  56        led->cdev.max_brightness = NVEC_LED_MAX;
  57
  58        led->cdev.brightness_set = nvec_led_brightness_set;
  59        led->cdev.name = "paz00-led";
  60        led->cdev.flags |= LED_CORE_SUSPENDRESUME;
  61        led->nvec = nvec;
  62
  63        platform_set_drvdata(pdev, led);
  64
  65        ret = led_classdev_register(&pdev->dev, &led->cdev);
  66        if (ret < 0)
  67                return ret;
  68
  69        /* to expose the default value to userspace */
  70        led->cdev.brightness = 0;
  71
  72        return 0;
  73}
  74
  75static int nvec_paz00_remove(struct platform_device *pdev)
  76{
  77        struct nvec_led *led = platform_get_drvdata(pdev);
  78
  79        led_classdev_unregister(&led->cdev);
  80
  81        return 0;
  82}
  83
  84static struct platform_driver nvec_paz00_driver = {
  85        .probe  = nvec_paz00_probe,
  86        .remove = nvec_paz00_remove,
  87        .driver = {
  88                .name  = "nvec-paz00",
  89                .owner = THIS_MODULE,
  90        },
  91};
  92
  93module_platform_driver(nvec_paz00_driver);
  94
  95MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
  96MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
  97MODULE_LICENSE("GPL");
  98MODULE_ALIAS("platform:nvec-paz00");
  99