2 * ADM5120 LED (GPIO) driver
4 * Copyright (C) Jeroen Vreeken (pe1rxq@amsat.org), 2005
7 #include <linux/autoconf.h>
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/miscdevice.h>
14 #define GPIO_IO ((unsigned long *)0xb20000b8)
16 static ssize_t adm5120_led_write(struct file *file, const char __user *data,
17 size_t len, loff_t *ppos)
21 if (!len || get_user(val, data))
23 *GPIO_IO=(*GPIO_IO & 0x00ffffff) | (val<<24);
27 static struct file_operations adm5120_led_fops = {
29 .write = adm5120_led_write,
32 static struct miscdevice adm5120_led_device = {
38 static int __init adm5120_led_init(void)
40 printk(KERN_INFO "ADM5120 LED & GPIO driver\n");
41 if (misc_register(&adm5120_led_device)) {
42 printk(KERN_WARNING "Couldn't register device %d\n", LED_MINOR);
48 static void __exit adm5120_led_exit(void)
50 misc_deregister(&adm5120_led_device);
53 module_init(adm5120_led_init);
54 module_exit(adm5120_led_exit);
56 MODULE_DESCRIPTION("ADM5120 LED and GPIO driver");
57 MODULE_AUTHOR("Jeroen Vreeken");
58 MODULE_LICENSE("GPL");