Root/drivers/staging/nvec/nvec_paz00.c

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 __devinit 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 __devexit 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 = __devexit_p(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

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