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1/* $Id: rtc.h,v 1.1.1.1 2004/03/25 04:29:22 hitoshiy Exp $ */
2
3#ifndef __RTC_H__
4#define __RTC_H__
5
6
7#include <linux/config.h>
8
9 /* Dallas DS1302 clock/calendar register numbers. */
10# define RTC_SECONDS 0
11# define RTC_MINUTES 1
12# define RTC_HOURS 2
13# define RTC_DAY_OF_MONTH 3
14# define RTC_MONTH 4
15# define RTC_WEEKDAY 5
16# define RTC_YEAR 6
17# define RTC_CONTROL 7
18
19 /* Bits in CONTROL register. */
20# define RTC_CONTROL_WRITEPROTECT 0x80
21# define RTC_TRICKLECHARGER 8
22
23 /* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
24# define RTC_TCR_PATTERN 0xA0 /* 1010xxxx */
25# define RTC_TCR_1DIOD 0x04 /* xxxx01xx */
26# define RTC_TCR_2DIOD 0x08 /* xxxx10xx */
27# define RTC_TCR_DISABLED 0x00 /* xxxxxx00 Disabled */
28# define RTC_TCR_2KOHM 0x01 /* xxxxxx01 2KOhm */
29# define RTC_TCR_4KOHM 0x02 /* xxxxxx10 4kOhm */
30# define RTC_TCR_8KOHM 0x03 /* xxxxxx11 8kOhm */
31
32#ifdef CONFIG_DS1302
33extern unsigned char ds1302_readreg(int reg);
34extern void ds1302_writereg(int reg, unsigned char val);
35extern int ds1302_init(void);
36# define CMOS_READ(x) ds1302_readreg(x)
37# define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
38# define RTC_INIT() ds1302_init()
39#else
40 /* No RTC configured so we shouldn't try to access any. */
41# define CMOS_READ(x) 42
42# define CMOS_WRITE(x,y)
43# define RTC_INIT() (-1)
44#endif
45
46/*
47 * The struct used to pass data via the following ioctl. Similar to the
48 * struct tm in <time.h>, but it needs to be here so that the kernel
49 * source is self contained, allowing cross-compiles, etc. etc.
50 */
51struct rtc_time {
52 int tm_sec;
53 int tm_min;
54 int tm_hour;
55 int tm_mday;
56 int tm_mon;
57 int tm_year;
58 int tm_wday;
59 int tm_yday;
60 int tm_isdst;
61};
62
63/* ioctl() calls that are permitted to the /dev/rtc interface. */
64#define RTC_MAGIC 'p'
65#define RTC_RD_TIME _IOR(RTC_MAGIC, 0x09, struct rtc_time) /* Read RTC time. */
66#define RTC_SET_TIME _IOW(RTC_MAGIC, 0x0a, struct rtc_time) /* Set RTC time. */
67#define RTC_SET_CHARGE _IOW(RTC_MAGIC, 0x0b, int)
68#define RTC_MAX_IOCTL 0x0b
69
70#endif /* __RTC_H__ */