Linux kernel mirror (for testing)
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1/* $Id: rtc.h,v 1.7 2002/11/04 07:32:09 starvik Exp $ */
2
3#ifndef __RTC_H__
4#define __RTC_H__
5
6
7#include <linux/config.h>
8
9#ifdef CONFIG_ETRAX_DS1302
10 /* Dallas DS1302 clock/calendar register numbers. */
11# define RTC_SECONDS 0
12# define RTC_MINUTES 1
13# define RTC_HOURS 2
14# define RTC_DAY_OF_MONTH 3
15# define RTC_MONTH 4
16# define RTC_WEEKDAY 5
17# define RTC_YEAR 6
18# define RTC_CONTROL 7
19
20 /* Bits in CONTROL register. */
21# define RTC_CONTROL_WRITEPROTECT 0x80
22# define RTC_TRICKLECHARGER 8
23
24 /* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
25# define RTC_TCR_PATTERN 0xA0 /* 1010xxxx */
26# define RTC_TCR_1DIOD 0x04 /* xxxx01xx */
27# define RTC_TCR_2DIOD 0x08 /* xxxx10xx */
28# define RTC_TCR_DISABLED 0x00 /* xxxxxx00 Disabled */
29# define RTC_TCR_2KOHM 0x01 /* xxxxxx01 2KOhm */
30# define RTC_TCR_4KOHM 0x02 /* xxxxxx10 4kOhm */
31# define RTC_TCR_8KOHM 0x03 /* xxxxxx11 8kOhm */
32
33#elif defined(CONFIG_ETRAX_PCF8563)
34 /* I2C bus slave registers. */
35# define RTC_I2C_READ 0xa3
36# define RTC_I2C_WRITE 0xa2
37
38 /* Phillips PCF8563 registers. */
39# define RTC_CONTROL1 0x00 /* Control/Status register 1. */
40# define RTC_CONTROL2 0x01 /* Control/Status register 2. */
41# define RTC_CLOCKOUT_FREQ 0x0d /* CLKOUT frequency. */
42# define RTC_TIMER_CONTROL 0x0e /* Timer control. */
43# define RTC_TIMER_CNTDOWN 0x0f /* Timer countdown. */
44
45 /* BCD encoded clock registers. */
46# define RTC_SECONDS 0x02
47# define RTC_MINUTES 0x03
48# define RTC_HOURS 0x04
49# define RTC_DAY_OF_MONTH 0x05
50# define RTC_WEEKDAY 0x06 /* Not coded in BCD! */
51# define RTC_MONTH 0x07
52# define RTC_YEAR 0x08
53# define RTC_MINUTE_ALARM 0x09
54# define RTC_HOUR_ALARM 0x0a
55# define RTC_DAY_ALARM 0x0b
56# define RTC_WEEKDAY_ALARM 0x0c
57
58#endif
59
60#ifdef CONFIG_ETRAX_DS1302
61extern unsigned char ds1302_readreg(int reg);
62extern void ds1302_writereg(int reg, unsigned char val);
63extern int ds1302_init(void);
64# define CMOS_READ(x) ds1302_readreg(x)
65# define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
66# define RTC_INIT() ds1302_init()
67#elif defined(CONFIG_ETRAX_PCF8563)
68extern unsigned char pcf8563_readreg(int reg);
69extern void pcf8563_writereg(int reg, unsigned char val);
70extern int pcf8563_init(void);
71# define CMOS_READ(x) pcf8563_readreg(x)
72# define CMOS_WRITE(val,reg) pcf8563_writereg(reg,val)
73# define RTC_INIT() pcf8563_init()
74#else
75 /* No RTC configured so we shouldn't try to access any. */
76# define CMOS_READ(x) 42
77# define CMOS_WRITE(x,y)
78# define RTC_INIT() (-1)
79#endif
80
81/*
82 * The struct used to pass data via the following ioctl. Similar to the
83 * struct tm in <time.h>, but it needs to be here so that the kernel
84 * source is self contained, allowing cross-compiles, etc. etc.
85 */
86struct rtc_time {
87 int tm_sec;
88 int tm_min;
89 int tm_hour;
90 int tm_mday;
91 int tm_mon;
92 int tm_year;
93 int tm_wday;
94 int tm_yday;
95 int tm_isdst;
96};
97
98/* ioctl() calls that are permitted to the /dev/rtc interface. */
99#define RTC_MAGIC 'p'
100#define RTC_RD_TIME _IOR(RTC_MAGIC, 0x09, struct rtc_time) /* Read RTC time. */
101#define RTC_SET_TIME _IOW(RTC_MAGIC, 0x0a, struct rtc_time) /* Set RTC time. */
102#define RTC_SET_CHARGE _IOW(RTC_MAGIC, 0x0b, int)
103#define RTC_VLOW_RD _IOR(RTC_MAGIC, 0x11, int) /* Voltage Low detector */
104#define RTC_VLOW_SET _IO(RTC_MAGIC, 0x12) /* Clear voltage low information */
105#define RTC_MAX_IOCTL 0x12
106
107#endif /* __RTC_H__ */