/*
 *  linux/include/linux/m41t00.h
 *
 *  Copyright (C) 2002 ABB
 *
 *  Author: Christoph Suter
 *			fels@datacomm.ch
 *
 *	Based on the work of
 *			Gérard Basler
 *          gbasler@ee.ethz.ch
 *
 *	Based on m41t11 driver by George Davis
 *
 *  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.
 */
#define EXPORT_SYMTAB
#define M41T00_DEBUG // turn debug messages on / off
#define M41T00_PATCH_KERNEL
#include <linux/devfs_fs_kernel.h>
#define M41T00_DEBUG

#undef PDEBUG
#if	defined M41T00_DEBUG
#	define	PDEBUG(fmt, args...)	printk(KERN_DEBUG "%s, %s [%d]: " fmt, __FILE__, __FUNCTION__ , __LINE__ , ## args)
#else
#	define	PDEBUG(fmt, args...)
#endif

/* internal definitions not for use in user space programs */
#ifdef __KERNEL__

/* undefined similar functions from other headers... */
#undef BCD_TO_BIN(val)
#define BCD_TO_BIN(val) (((val)&15) + ((val)>>4)*10)

#undef BIN_TO_BCD(val)
#define BIN_TO_BCD(val) ((((val)/10)<<4) + (val)%10)

#undef IS_LOWNIBBLE_BCD(x)
#define IS_LOWNIBBLE_BCD(x) ( (x & 0x0f) < 10 )

#undef IS_BCD(x)
#define IS_BCD(x) ( ( (x & 0x0f) < 10) && ( (x & 0xf0) <10) ) )


#undef DAT(x)
#define DAT(x) ((unsigned int)(x->data)) /* x: i2c_client->data */


#define M41T00_IOC_MAGIC 0xcc

#define CTRL_STOP	0x80

/* structure used for reading */
struct rtc_registers_cs {
	unsigned char 	secs	__attribute__ ((packed));
	unsigned char 	mins 	__attribute__ ((packed));
	unsigned char 	hours 	__attribute__ ((packed));
	unsigned char 	wday	__attribute__ ((packed));
	unsigned char 	mday 	__attribute__ ((packed));
	unsigned char 	mon 	__attribute__ ((packed));
	unsigned char 	year	__attribute__ ((packed));
	unsigned char 	cs		__attribute__ ((packed));
};


/*
 * Function prototypes
 */

static int __init m41t00_init(void);
static void __exit m41t00_exit(void);
static int m41t00_detect_client(struct i2c_adapter *adap, int addr, unsigned short flags, int kind);
static int m41t00_attach(struct i2c_adapter *adap);
static int m41t00_detach(struct i2c_client *client);
static int m41t00_get_datetime(struct i2c_client *client, struct rtc_time *dt);
static int m41t00_set_datetime(struct i2c_client *client, struct rtc_time *dt);
static int checkdate(struct rtc_time *dt);
static int m41t00_command(struct i2c_client *client, unsigned int cmd, void *arg);
static int m41t00_open(struct inode *minode, struct file *mfile);
static int m41t00_release(struct inode *minode, struct file *mfile);
static int m41t00_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_PROC_FS
static int m41t00_proc_output (char *buf);
#endif // CONFIG_PROC_FS
static void m41t00_print_info(struct rtc_registers_cs *rtc);
#ifdef M41T00_DEBUG
static void m41t00_print_content(struct rtc_registers_cs *rtc);
#endif // M41T00_DEBUG
static int m41t00_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data);

static void m41t00_rtc_to_tm(struct rtc_registers_cs *rtc, struct rtc_time *dt);
static void m41t00_tm_to_rtc(struct rtc_time *dt, struct rtc_registers_cs *rtc);

#if defined CONFIG_PPC
static int set_rtc_time_interrupt(unsigned long nowtime);
static void set_rtc_time_task(void *p);
#endif // CONFIG_PPC

#endif // __KERNEL__