Linux Kernel  3.7.1
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rtc.h
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1 #ifndef __RTC_H__
2 #define __RTC_H__
3 
4  /* Dallas DS1302 clock/calendar register numbers. */
5 # define RTC_SECONDS 0
6 # define RTC_MINUTES 1
7 # define RTC_HOURS 2
8 # define RTC_DAY_OF_MONTH 3
9 # define RTC_MONTH 4
10 # define RTC_WEEKDAY 5
11 # define RTC_YEAR 6
12 # define RTC_CONTROL 7
13 
14  /* Bits in CONTROL register. */
15 # define RTC_CONTROL_WRITEPROTECT 0x80
16 # define RTC_TRICKLECHARGER 8
17 
18  /* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
19 # define RTC_TCR_PATTERN 0xA0 /* 1010xxxx */
20 # define RTC_TCR_1DIOD 0x04 /* xxxx01xx */
21 # define RTC_TCR_2DIOD 0x08 /* xxxx10xx */
22 # define RTC_TCR_DISABLED 0x00 /* xxxxxx00 Disabled */
23 # define RTC_TCR_2KOHM 0x01 /* xxxxxx01 2KOhm */
24 # define RTC_TCR_4KOHM 0x02 /* xxxxxx10 4kOhm */
25 # define RTC_TCR_8KOHM 0x03 /* xxxxxx11 8kOhm */
26 
27 #ifdef CONFIG_DS1302
28 extern unsigned char ds1302_readreg(int reg);
29 extern void ds1302_writereg(int reg, unsigned char val);
30 extern int ds1302_init(void);
31 # define CMOS_READ(x) ds1302_readreg(x)
32 # define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
33 # define RTC_INIT() ds1302_init()
34 #else
35  /* No RTC configured so we shouldn't try to access any. */
36 # define CMOS_READ(x) 42
37 # define CMOS_WRITE(x,y)
38 # define RTC_INIT() (-1)
39 #endif
40 
41 /*
42  * The struct used to pass data via the following ioctl. Similar to the
43  * struct tm in <time.h>, but it needs to be here so that the kernel
44  * source is self contained, allowing cross-compiles, etc. etc.
45  */
46 struct rtc_time {
47  int tm_sec;
48  int tm_min;
49  int tm_hour;
50  int tm_mday;
51  int tm_mon;
52  int tm_year;
53  int tm_wday;
54  int tm_yday;
55  int tm_isdst;
56 };
57 
58 /* ioctl() calls that are permitted to the /dev/rtc interface. */
59 #define RTC_MAGIC 'p'
60 #define RTC_RD_TIME _IOR(RTC_MAGIC, 0x09, struct rtc_time) /* Read RTC time. */
61 #define RTC_SET_TIME _IOW(RTC_MAGIC, 0x0a, struct rtc_time) /* Set RTC time. */
62 #define RTC_SET_CHARGE _IOW(RTC_MAGIC, 0x0b, int)
63 #define RTC_MAX_IOCTL 0x0b
64 
65 #endif /* __RTC_H__ */