1 /*
2 * LEDs driver for PCEngines WRAP
3 *
4 * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
5 *
6 * Based on leds-net48xx.c
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/leds.h>
17 #include <linux/err.h>
18 #include <asm/io.h>
19 #include <linux/scx200_gpio.h>
20 #include <linux/module.h>
21
22 #define DRVNAME "wrap-led"
23 #define WRAP_POWER_LED_GPIO 2
24 #define WRAP_ERROR_LED_GPIO 3
25 #define WRAP_EXTRA_LED_GPIO 18
26
27 static struct platform_device *pdev;
28
wrap_power_led_set(struct led_classdev * led_cdev,enum led_brightness value)29 static void wrap_power_led_set(struct led_classdev *led_cdev,
30 enum led_brightness value)
31 {
32 if (value)
33 scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
34 else
35 scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
36 }
37
wrap_error_led_set(struct led_classdev * led_cdev,enum led_brightness value)38 static void wrap_error_led_set(struct led_classdev *led_cdev,
39 enum led_brightness value)
40 {
41 if (value)
42 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
43 else
44 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
45 }
46
wrap_extra_led_set(struct led_classdev * led_cdev,enum led_brightness value)47 static void wrap_extra_led_set(struct led_classdev *led_cdev,
48 enum led_brightness value)
49 {
50 if (value)
51 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
52 else
53 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
54 }
55
56 static struct led_classdev wrap_power_led = {
57 .name = "wrap::power",
58 .brightness_set = wrap_power_led_set,
59 .default_trigger = "default-on",
60 .flags = LED_CORE_SUSPENDRESUME,
61 };
62
63 static struct led_classdev wrap_error_led = {
64 .name = "wrap::error",
65 .brightness_set = wrap_error_led_set,
66 .flags = LED_CORE_SUSPENDRESUME,
67 };
68
69 static struct led_classdev wrap_extra_led = {
70 .name = "wrap::extra",
71 .brightness_set = wrap_extra_led_set,
72 .flags = LED_CORE_SUSPENDRESUME,
73 };
74
wrap_led_probe(struct platform_device * pdev)75 static int wrap_led_probe(struct platform_device *pdev)
76 {
77 int ret;
78
79 ret = led_classdev_register(&pdev->dev, &wrap_power_led);
80 if (ret < 0)
81 return ret;
82
83 ret = led_classdev_register(&pdev->dev, &wrap_error_led);
84 if (ret < 0)
85 goto err1;
86
87 ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
88 if (ret < 0)
89 goto err2;
90
91 return ret;
92
93 err2:
94 led_classdev_unregister(&wrap_error_led);
95 err1:
96 led_classdev_unregister(&wrap_power_led);
97
98 return ret;
99 }
100
wrap_led_remove(struct platform_device * pdev)101 static int wrap_led_remove(struct platform_device *pdev)
102 {
103 led_classdev_unregister(&wrap_power_led);
104 led_classdev_unregister(&wrap_error_led);
105 led_classdev_unregister(&wrap_extra_led);
106 return 0;
107 }
108
109 static struct platform_driver wrap_led_driver = {
110 .probe = wrap_led_probe,
111 .remove = wrap_led_remove,
112 .driver = {
113 .name = DRVNAME,
114 .owner = THIS_MODULE,
115 },
116 };
117
wrap_led_init(void)118 static int __init wrap_led_init(void)
119 {
120 int ret;
121
122 if (!scx200_gpio_present()) {
123 ret = -ENODEV;
124 goto out;
125 }
126
127 ret = platform_driver_register(&wrap_led_driver);
128 if (ret < 0)
129 goto out;
130
131 pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
132 if (IS_ERR(pdev)) {
133 ret = PTR_ERR(pdev);
134 platform_driver_unregister(&wrap_led_driver);
135 goto out;
136 }
137
138 out:
139 return ret;
140 }
141
wrap_led_exit(void)142 static void __exit wrap_led_exit(void)
143 {
144 platform_device_unregister(pdev);
145 platform_driver_unregister(&wrap_led_driver);
146 }
147
148 module_init(wrap_led_init);
149 module_exit(wrap_led_exit);
150
151 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
152 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
153 MODULE_LICENSE("GPL");
154
155