pcf8593.h

pcf8593实时时钟的驱动实例 Real Time Clock interface for Linux on CPE with FTRTC010

/*
 *  linux/drivers/char/pcf8593.h
 *
 *  Copyright (C) 2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
struct rtc_tm {
	unsigned char	cs;
	unsigned char	secs;
	unsigned char	mins;
	unsigned char	hours;
	unsigned char	mday;
	unsigned char	mon;
	unsigned char	year_off;
	unsigned char	wday;
};

struct mem {
	unsigned int	loc;
	unsigned int	nr;
	unsigned char	*data;
};

#define RTC_GETDATETIME	0
#define RTC_SETTIME	1
#define RTC_SETDATETIME	2
#define RTC_GETCTRL	3
#define RTC_SETCTRL	4
#define MEM_READ	5
#define MEM_WRITE	6

#define CTRL_STOP	0x80
#define CTRL_HOLD	0x40
#define CTRL_32KHZ	0x00
#define CTRL_MASK	0x08
#define CTRL_ALARMEN	0x04
#define CTRL_ALARM	0x02
#define CTRL_TIMER	0x01
/*add by ljn*/
#define PCF8593_READ_ADDR	0xA3
#define PCF8593_WRITE_ADDR	0xA2
#ifndef BCD_TO_BIN
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
#endif

#ifndef BIN_TO_BCD
#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
#endif