1 #include <linux/miscdevice.h>
  2 #include <linux/delay.h>
  3 #include <asm/irq.h>
  4 #include <mach/regs-gpio.h>
  5 #include <mach/hardware.h>
  6 #include <linux/kernel.h>
  7 #include <linux/module.h>
  8 #include <linux/init.h>
  9 #include <linux/mm.h>
 10 #include <linux/fs.h>
 11 #include <linux/types.h>
 12 #include <linux/delay.h>
 13 #include <linux/moduleparam.h>
 14 #include <linux/slab.h>
 15 #include <linux/errno.h>
 16 #include <linux/ioctl.h>
 17 #include <linux/cdev.h>
 18 #include <linux/string.h>
 19 #include <linux/list.h>
 20 #include <linux/pci.h>
 21 #include <linux/gpio.h>
 22 #include <asm/uaccess.h>
 23 #include <asm/atomic.h>
 24 #include <asm/unistd.h>
 25
 26
 27 #define DEVICE_NAME "leds"
 28
 29 #define IOCTL_LED_ON 1
 30 #define IOCTL_LED_OFF 0
 31
 32 static unsigned long led_table [] =
 33 {
 34 S3C2410_GPB(5),
 35 S3C2410_GPB(6),
 36 S3C2410_GPB(7),
 37 S3C2410_GPB(8),
 38 };
 39
 40 static unsigned int led_cfg_table [] =
 41 {
 42 S3C2410_GPIO_OUTPUT,
 43 S3C2410_GPIO_OUTPUT,
 44 S3C2410_GPIO_OUTPUT,
 45 S3C2410_GPIO_OUTPUT,
 46 };
 47
 48 static int gt2440_leds_ioctl(
 49 // struct inode *inode,
 50 struct file *file,
 51 unsigned int cmd,
 52 unsigned long arg)
 53 {
 54 if (arg > 4)
 55 {
 56 return -EINVAL;
 57 }
 58
 59 switch(cmd)
 60 {
 61 case IOCTL_LED_ON:
 62 // 设置指定引脚的输出电平为0
 63 s3c2410_gpio_setpin(led_table[arg], 0);
 64 return 0;
 65
 66 case IOCTL_LED_OFF:
 67 // 设置指定引脚的输出电平为1
 68 s3c2410_gpio_setpin(led_table[arg], 1);
 69 return 0;
 70
 71 default:
 72 return -EINVAL;
 73 }
 74 }
 75
 76 static struct file_operations dev_fops = {
 77 .owner = THIS_MODULE,
 78 .unlocked_ioctl =  gt2440_leds_ioctl,
 79 };
 80
 81 static struct miscdevice misc = {
 82 .minor = MISC_DYNAMIC_MINOR,
 83 .name = DEVICE_NAME,
 84 .fops = &dev_fops,
 85 };
 86
 87 static int __init dev_init(void)
 88 {
 89 int ret;
 90
 91 int i;
 92 for (i = 0; i < 4; i++)
 93 {
 94 s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);
 95 s3c2410_gpio_setpin(led_table[i], 0);
 96 }
 97
 98 ret = misc_register(&misc);
 99
100 printk (DEVICE_NAME" initialized\n");
101
102 return ret;
103 }
104
105 static void __exit dev_exit(void)
106 {
107 misc_deregister(&misc);
108 }
109
110 module_init(dev_init);
111 module_exit(dev_exit);
112
113 MODULE_LICENSE("GPL");
114 MODULE_AUTHOR("www.e-online.cc");
115 MODULE_DESCRIPTION("LEDS control for GT2440 Board");