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