ARM11 linux LED驱动程序

#include <linux/miscdevice.h> #include <linux/delay.h> #include <asm/irq.h> //#include <mach/regs-gpio.h> #include <mach/hardware.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/ioctl.h> #include <linux/cdev.h> #include <linux/string.h> #include <linux/list.h> #include <linux/pci.h> #include <asm/uaccess.h> #include <asm/atomic.h> #include <asm/unistd.h> #include <mach/map.h> #include <mach/regs-clock.h> #include <mach/regs-gpio.h> #include <plat/gpio-cfg.h> #include <mach/gpio-bank-e.h> #include <mach/gpio-bank-k.h> #define DEVICE_NAME "leds" static long sbc2440_leds_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { switch(cmd) { unsigned tmp; case 0: case 1: if (arg > 4) { return -EINVAL; } tmp = readl(S3C64XX_GPKDAT); tmp &= ~(1 << (4 + arg)); tmp |= ( (!cmd) << (4 + arg) ); writel(tmp, S3C64XX_GPKDAT); //printk (DEVICE_NAME": %d %d\n", arg, cmd); return 0; default: return -EINVAL; } } static struct file_operations dev_fops = { .owner = THIS_MODULE, .unlocked_ioctl = sbc2440_leds_ioctl, }; static struct miscdevice misc = { .minor = MISC_DYNAMIC_MINOR, .name = DEVICE_NAME, .fops = &dev_fops, }; static int __init dev_init(void) { int ret; { unsigned tmp; tmp = readl(S3C64XX_GPKCON); tmp = (tmp & ~(0xffffU<<16))|(0x1111U<<16); writel(tmp, S3C64XX_GPKCON); tmp = readl(S3C64XX_GPKDAT); tmp |= (0xF << 4); writel(tmp, S3C64XX_GPKDAT); } ret = misc_register(&misc); printk (DEVICE_NAME"\tinitialized\n"); return ret; } static void __exit dev_exit(void) { misc_deregister(&misc); } module_init(dev_init); module_exit(dev_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("FriendlyARM Inc.");