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__ */ 66