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我用的是TQ2440開(kāi)發(fā)板,這個(gè)程序是參考韋東山的. 4盞LED燈 以下是驅(qū)動(dòng)程序 - #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/fs.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <asm/uaccess.h>
- #include <asm/irq.h>
- #include <asm/io.h>
- #include <asm/arch/regs-gpio.h>
- #include <asm/hardware.h>
- static struct class *firstdrv_class;
- static struct class_device *firstdrv_class_dev;
- volatile unsigned long *gpbcon = NULL;
- volatile unsigned long *gpbdat = NULL;
- static int first_drv_open(struct inode *inode, struct file *file)
- {
- //printk("first_drv_open\n");
- /* 配置gpb5,6,7,8為輸出 */
- *gpbcon &= ~((0x3<<(5*2)) | (0x3<<(6*2)) | (0x3<<(7*2)) | (0x3<<(8*2)));
- *gpbcon |= ((0x1<<(5*2)) |(0x1<<(6*2)) | (0x1<<(7*2)) | (0x1<<(8*2)));
- return 0;
- }
- static ssize_t first_drv_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
- {
- int val;
- //printk("first_drv_write\n");
- copy_from_user(&val, buf, count); // copy_to_user();
- if (val == 1)
- {
- // 點(diǎn)燈
- *gpbdat &= ~((1<<5) | (1<<6) | (1<<7) | (1<<8));
- }
- else
- {
- // 滅燈
- *gpbdat |= (1<<5) | (1<<6) | (1<<7) | (1<<8);
- }
-
- return 0;
- }
- static struct file_operations first_drv_fops = {
- .owner = THIS_MODULE, /* 這是一個(gè)宏，推向編譯模塊時(shí)自動(dòng)創(chuàng)建的__this_module變量 */
- .open = first_drv_open,
- .write = first_drv_write,
- };
- int major;
- static int first_drv_init(void)
- {
- major = register_chrdev(0, "first_drv", &first_drv_fops); // 注冊(cè), 告訴內(nèi)核
- firstdrv_class = class_create(THIS_MODULE, "firstdrv");
- firstdrv_class_dev = class_device_create(firstdrv_class, NULL, MKDEV(major, 0), NULL, "xyz"); /* /dev/xyz */
- gpbcon = (volatile unsigned long *)ioremap(0x56000010, 16); //0x56000010是的GPIOB的
- gpbdat = gpbcon + 1;
- printk("first_drv_init...\n");
- return 0;
- }
- static void first_drv_exit(void)
- {
- unregister_chrdev(major, "first_drv"); // 卸載
- class_device_unregister(firstdrv_class_dev);
- class_destroy(firstdrv_class);
- iounmap(gpbcon);
- printk("first_drv_exit...\n");
- }
- module_init(first_drv_init);
- module_exit(first_drv_exit);
- MODULE_LICENSE("GPL");
以下是測(cè)試程序 - #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <stdio.h>
- /* firstdrvtest on
- * firstdrvtest off
- */
- int main(int argc, char **argv)
- {
- int fd;
- int val = 1;
- fd = open("/dev/xyz", O_RDWR);
- if (fd < 0)
- {
- printf("can't open!\n");
- }
- if (argc != 2)
- {
- printf("Usage :\n");
- printf("%s <on|off>\n", argv[0]);
- return 0;
- }
- if (strcmp(argv[1], "on") == 0)
- {
- val = 1;
- }
- else
- {
- val = 0;
- }
-
- write(fd, &val, 4);
- return 0;
- }
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