66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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#ifndef __RTC_H__
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#define __RTC_H__
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/* Dallas DS1302 clock/calendar register numbers. */
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# define RTC_SECONDS 0
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# define RTC_MINUTES 1
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# define RTC_HOURS 2
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# define RTC_DAY_OF_MONTH 3
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# define RTC_MONTH 4
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# define RTC_WEEKDAY 5
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# define RTC_YEAR 6
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# define RTC_CONTROL 7
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/* Bits in CONTROL register. */
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# define RTC_CONTROL_WRITEPROTECT 0x80
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# define RTC_TRICKLECHARGER 8
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/* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
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# define RTC_TCR_PATTERN 0xA0 /* 1010xxxx */
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# define RTC_TCR_1DIOD 0x04 /* xxxx01xx */
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# define RTC_TCR_2DIOD 0x08 /* xxxx10xx */
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# define RTC_TCR_DISABLED 0x00 /* xxxxxx00 Disabled */
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# define RTC_TCR_2KOHM 0x01 /* xxxxxx01 2KOhm */
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# define RTC_TCR_4KOHM 0x02 /* xxxxxx10 4kOhm */
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# define RTC_TCR_8KOHM 0x03 /* xxxxxx11 8kOhm */
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#ifdef CONFIG_DS1302
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extern unsigned char ds1302_readreg(int reg);
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extern void ds1302_writereg(int reg, unsigned char val);
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extern int ds1302_init(void);
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# define CMOS_READ(x) ds1302_readreg(x)
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# define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
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# define RTC_INIT() ds1302_init()
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#else
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/* No RTC configured so we shouldn't try to access any. */
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# define CMOS_READ(x) 42
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# define CMOS_WRITE(x,y)
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# define RTC_INIT() (-1)
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#endif
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/*
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* The struct used to pass data via the following ioctl. Similar to the
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* struct tm in <time.h>, but it needs to be here so that the kernel
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* source is self contained, allowing cross-compiles, etc. etc.
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*/
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struct rtc_time {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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};
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/* ioctl() calls that are permitted to the /dev/rtc interface. */
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#define RTC_MAGIC 'p'
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#define RTC_RD_TIME _IOR(RTC_MAGIC, 0x09, struct rtc_time) /* Read RTC time. */
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#define RTC_SET_TIME _IOW(RTC_MAGIC, 0x0a, struct rtc_time) /* Set RTC time. */
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#define RTC_SET_CHARGE _IOW(RTC_MAGIC, 0x0b, int)
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#define RTC_MAX_IOCTL 0x0b
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#endif /* __RTC_H__ */
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