dac_driver.h

来自「S3C2410 DAC驱动程序」· C头文件 代码 · 共 36 行

#ifndef _DAC_H_
#define _DAC_H_

/********************************************************
 * Macros to help debugging
 ********************************************************/
#undef PDEBUG             /* undef it, just in case */
#ifdef DAC_DEBUG
#ifdef __KERNEL__
#	define PDEBUG(fmt, args...) printk( KERN_DEBUG "DAC: " fmt, ## args)
#else
#	define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
#endif
#else
#	define PDEBUG(fmt, args...) /* not debugging: nothing */
#endif

#undef PDEBUGG
#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */

#define DAC_MAJOR 226
#define DAC_MINOR 0

struct dac_dev 
{
	struct cdev cdev; /* Char device structure		*/
};

ssize_t dac_read(struct file *filp, char __user *buf, size_t count,
                   loff_t *f_pos);
ssize_t dac_write(struct file *filp, const char __user *buf, size_t count,
                    loff_t *f_pos);


#endif /* _DAC_H_ */