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
28 struct nvec_led {
29 struct led_classdev cdev;
30 struct nvec_chip *nvec;
31 };
32
nvec_led_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)33 static 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
nvec_paz00_probe(struct platform_device * pdev)46 static 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
nvec_paz00_remove(struct platform_device * pdev)75 static 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
84 static 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
93 module_platform_driver(nvec_paz00_driver);
94
95 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
96 MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
97 MODULE_LICENSE("GPL");
98 MODULE_ALIAS("platform:nvec-paz00");
99