1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* (C) Copyright 2001
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Generic RTC interface.
*/
#ifndef _RTC_H_
#define _RTC_H_
/* bcd<->bin functions are needed by almost all the RTC drivers, let's include
* it there instead of in evey single driver */
#include <bcd.h>
/*
* The struct used to pass data from the generic interface code to
* the hardware dependend low-level code ande vice versa. Identical
* to struct rtc_time used by the Linux kernel.
*
* Note that there are small but significant differences to the
* common "struct time":
*
* struct time: struct rtc_time:
* tm_mon 0 ... 11 1 ... 12
* tm_year years since 1900 years since 0
*/
struct rtc_time {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
int rtc_get (struct rtc_time *);
int rtc_set (struct rtc_time *);
void rtc_reset (void);
/**
* rtc_read8() - Read an 8-bit register
*
* @reg: Register to read
* @return value read
*/
int rtc_read8(int reg);
/**
* rtc_write8() - Write an 8-bit register
*
* @reg: Register to write
* @value: Value to write
*/
void rtc_write8(int reg, uchar val);
/**
* rtc_read32() - Read a 32-bit value from the RTC
*
* @reg: Offset to start reading from
* @return value read
*/
u32 rtc_read32(int reg);
/**
* rtc_write32() - Write a 32-bit value to the RTC
*
* @reg: Register to start writing to
* @value: Value to write
*/
void rtc_write32(int reg, u32 value);
/**
* rtc_init() - Set up the real time clock ready for use
*/
void rtc_init(void);
/**
* rtc_calc_weekday() - Work out the weekday from a time
*
* This only works for the Gregorian calendar - i.e. after 1752 (in the UK).
* It sets time->tm_wdaay to the correct day of the week.
*
* @time: Time to inspect. tm_wday is updated
* @return 0 if OK, -EINVAL if the weekday could not be determined
*/
int rtc_calc_weekday(struct rtc_time *time);
/**
* rtc_to_tm() - Convert a time_t value into a broken-out time
*
* The following fields are set up by this function:
* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday
*
* Note that tm_yday and tm_isdst are set to 0.
*
* @time_t: Number of seconds since 1970-01-01 00:00:00
* @time: Place to put the broken-out time
* @return 0 if OK, -EINVAL if the weekday could not be determined
*/
int rtc_to_tm(int time_t, struct rtc_time *time);
/**
* rtc_mktime() - Convert a broken-out time into a time_t value
*
* The following fields need to be valid for this function to work:
* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year
*
* Note that tm_wday and tm_yday are ignored.
*
* @time: Broken-out time to convert
* @return corresponding time_t value, seconds since 1970-01-01 00:00:00
*/
unsigned long rtc_mktime(const struct rtc_time *time);
#endif /* _RTC_H_ */
|
