字元裝置驅動之LED 混雜裝置驅動（misc）

misc_led.c

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

static volatile unsigned long * gpfcon; // = (volatile unsigned long *)0x56000050;

static volatile unsigned long * gpfdat; // = (volatile unsigned long *)0x56000054;

int led_open(struct inode *inode, struct file *file)

ssize_t led_write(struct file *file, const char __user *buf, size_t size, loff_t *offset)

copy_from_user(ker_buf, buf, 2);

if (ker_buf[0] < 0 || ker_buf[0] > 3)

return -einval;

if ((ker_buf[1] != 0) && (ker_buf[1] != 1))

return -einval;

if (ker_buf[1])

else

return 2;

}/* buf[0] - led1,0亮, 1滅 */

/* buf[1] - led2,0亮, 1滅 */

/* buf[2] - led3,0亮, 1滅 */

/* buf[3] - led4,0亮, 1滅 */

ssize_t led_read(struct file *file, char __user *buf, size_t size, loff_t *offset)

static const struct file_operations led_fops = ;

staticstruct miscdeviceled_misc = ;

int led_init(void)

void led_exit(void)

module_init(led_init);

module_exit(led_exit);

module_license("gpl");

test.c

#include

#include

#include

#include

#include

/* led_test

*  led_test r

*/void print_usage(char *str)

int main(int argc, char **argv)

fd = open("/dev/led", o_rdwr);

if (fd < 0)

if (argc == 3)

else

ret = write(fd, buf, 2);

if (ret != 2)

}else}}

return 0;

} 

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