1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* $Id$
*
* Driver for LEDs connected to GPIO lines
*
* Copyright (C) 2007 OpenWrt.org
* Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
*
* This file was derived from:
* /drivers/led/leds-s3c24xx.c
* (c) 2006 Simtec Electronics, Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/gpio_leds.h>
#include <asm/io.h>
#include <asm/gpio.h>
#define DRV_NAME "gpio-led"
#define DRV_DESC "GPIO LEDs driver"
struct gpio_led_device {
struct led_classdev cdev;
struct gpio_led_platform_data *pdata;
};
static inline struct gpio_led_device *pdev_to_led(struct platform_device *dev)
{
return platform_get_drvdata(dev);
}
static inline struct gpio_led_device *class_to_led(struct led_classdev *led_cdev)
{
return container_of(led_cdev, struct gpio_led_device, cdev);
}
static void gpio_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct gpio_led_device *led;
struct gpio_led_platform_data *pdata;
led = class_to_led(led_cdev);
pdata = led->pdata;
switch (brightness) {
case LED_OFF:
gpio_direction_output(pdata->gpio, pdata->value_off);
break;
default:
gpio_direction_output(pdata->gpio, pdata->value_on);
break;
}
}
static int __devinit gpio_led_probe(struct platform_device *dev)
{
struct gpio_led_platform_data *pdata;
struct gpio_led_device *led;
int ret;
pdata = dev->dev.platform_data;
if (pdata == NULL) {
dev_err(&dev->dev, "no platform data, id=%d\n", dev->id);
ret = -EINVAL;
goto err;
}
if (pdata->name == NULL) {
dev_err(&dev->dev, "no led name specified\n");
ret = -EINVAL;
goto err;
}
ret = gpio_request(pdata->gpio, pdata->name);
if (ret) {
dev_err(&dev->dev, "gpio_request failed\n");
goto err;
}
led = kzalloc(sizeof(*led), GFP_KERNEL);
if (led == NULL) {
dev_err(&dev->dev, "no memory for device");
ret = -ENOMEM;
goto err_free_gpio;
}
platform_set_drvdata(dev, led);
led->pdata = pdata;
led->cdev.name = pdata->name;
led->cdev.brightness_set = gpio_led_set;
#ifdef CONFIG_LEDS_TRIGGERS
led->cdev.default_trigger = pdata->trigger;
#endif
ret = led_classdev_register(&dev->dev, &led->cdev);
if (ret < 0) {
dev_err(&dev->dev, "led_classdev_register failed");
goto err_free_led;
}
return 0;
err_free_led:
kfree(led);
err_free_gpio:
gpio_free(pdata->gpio);
err:
return ret;
}
static int __devexit gpio_led_remove(struct platform_device *dev)
{
struct gpio_led_device *led;
struct gpio_led_platform_data *pdata;
pdata = dev->dev.platform_data;
led = pdev_to_led(dev);
led_classdev_unregister(&led->cdev);
kfree(led);
gpio_free(pdata->gpio);
return 0;
}
#ifdef CONFIG_PM
static int gpio_led_suspend(struct platform_device *dev,
pm_message_t state)
{
struct gpio_led_device *led;
led = pdev_to_led(dev);
led_classdev_suspend(&led->cdev);
return 0;
}
static int gpio_led_resume(struct platform_device *dev)
{
struct gpio_led_device *led;
led = pdev_to_led(dev);
led_classdev_resume(&led->cdev);
return 0;
}
#endif /* CONFIG_PM */
static struct platform_driver gpio_led_driver = {
.probe = gpio_led_probe,
.remove = __devexit_p(gpio_led_remove),
#ifdef CONFIG_PM
.suspend = gpio_led_suspend,
.resume = gpio_led_resume,
#endif
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init gpio_led_init(void)
{
int ret;
ret = platform_driver_register(&gpio_led_driver);
if (ret)
printk(KERN_ALERT DRV_DESC " register failed\n");
else
printk(KERN_INFO DRV_DESC " registered\n");
return ret;
}
static void __exit gpio_led_exit(void)
{
platform_driver_unregister(&gpio_led_driver);
}
module_init(gpio_led_init);
module_exit(gpio_led_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg@freemail.hu>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");
|
