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(led->nvec, buf, 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(pdev->dev.parent);
42	struct nvec_led *led;
43	int ret = 0;
44
45	led = devm_kzalloc(&pdev->dev, 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, led);
57
58	ret = devm_led_classdev_register(&pdev->dev, &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