drivers/rtc/ds1337.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * (C) Copyright 2001-2008
9  * Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
10  * DS1337 Real Time Clock (RTC).
67  * Get the current time from the RTC
72 	uchar sec, min, hour, mday, wday, mon_cent, year, control, status;  in rtc_get()  local
76 	sec = rtc_read (RTC_SEC_REG_ADDR);  in rtc_get()
90 		"hr: %02x min: %02x sec: %02x control: %02x status: %02x\n",  in rtc_get()
91 		year, mon_cent, mday, wday, hour, min, sec, control, status);  in rtc_get()
98 		rel = -1;  in rtc_get()
101 	tmp->tm_sec  = bcd2bin (sec & 0x7F);  in rtc_get()
102 	tmp->tm_min  = bcd2bin (min & 0x7F);  in rtc_get()
103 	tmp->tm_hour = bcd2bin (hour & 0x3F);  in rtc_get()
104 	tmp->tm_mday = bcd2bin (mday & 0x3F);  in rtc_get()
105 	tmp->tm_mon  = bcd2bin (mon_cent & 0x1F);  in rtc_get()
106 	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);  in rtc_get()
107 	tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);  in rtc_get()
108 	tmp->tm_yday = 0;  in rtc_get()
109 	tmp->tm_isdst= 0;  in rtc_get()
111 	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_get()
112 		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_get()
113 		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_get()
126 	debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_set()
127 		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_set()
128 		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_set()
130 	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));  in rtc_set()
132 	century = (tmp->tm_year >= 2000) ? 0x80 : 0;  in rtc_set()
133 	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon) | century);  in rtc_set()
135 	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));  in rtc_set()
136 	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));  in rtc_set()
137 	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));  in rtc_set()
138 	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));  in rtc_set()
139 	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));  in rtc_set()
146  * Reset the RTC.  We also enable the oscillator output on the