1// SPDX-License-Identifier: GPL-2.0
2/*
3 * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
4 *
5 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
6 *
7 * Authors: Ilya Petrov <ilya.muromec@gmail.com>
8 */
9
10#include <linux/module.h>
11#include <linux/err.h>
12#include <linux/slab.h>
13#include <linux/leds.h>
14#include <linux/platform_device.h>
15#include "nvec.h"
16
17#define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
18
19#define NVEC_LED_MAX 8
20
21struct nvec_led {
22 struct led_classdev cdev;
23 struct nvec_chip *nvec;
24};
25
26static void nvec_led_brightness_set(struct led_classdev *led_cdev,
27 enum led_brightness value)
28{
29 struct nvec_led *led = container_of(led_cdev, struct nvec_led, cdev);
30 unsigned char buf[] = NVEC_LED_REQ;
31
32 buf[4] = value;
33
34 nvec_write_async(nvec: led->nvec, data: buf, size: sizeof(buf));
35
36 led->cdev.brightness = value;
37}
38
39static int nvec_paz00_probe(struct platform_device *pdev)
40{
41 struct nvec_chip *nvec = dev_get_drvdata(dev: pdev->dev.parent);
42 struct nvec_led *led;
43 int ret = 0;
44
45 led = devm_kzalloc(dev: &pdev->dev, size: sizeof(*led), GFP_KERNEL);
46 if (!led)
47 return -ENOMEM;
48
49 led->cdev.max_brightness = NVEC_LED_MAX;
50
51 led->cdev.brightness_set = nvec_led_brightness_set;
52 led->cdev.name = "paz00-led";
53 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
54 led->nvec = nvec;
55
56 platform_set_drvdata(pdev, data: led);
57
58 ret = devm_led_classdev_register(parent: &pdev->dev, led_cdev: &led->cdev);
59 if (ret < 0)
60 return ret;
61
62 /* to expose the default value to userspace */
63 led->cdev.brightness = 0;
64
65 return 0;
66}
67
68static struct platform_driver nvec_paz00_driver = {
69 .probe = nvec_paz00_probe,
70 .driver = {
71 .name = "nvec-paz00",
72 },
73};
74
75module_platform_driver(nvec_paz00_driver);
76
77MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
78MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
79MODULE_LICENSE("GPL");
80MODULE_ALIAS("platform:nvec-paz00");
81

source code of linux/drivers/staging/nvec/nvec_paz00.c