用混雜設備實現的Mini6410 LED驅動程序:
- #include <linux/miscdevice.h>
- #include <linux/delay.h>
- #include <asm/irq.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("muge0913");
僅供技術交流學習,請勿商用。