1 // SPDX-License-Identifier: GPL-2.0-only
6  *  Copyright (C) 2003 - 2007 Paul Mundt
25 #define RTC_ADDR_TCR	0x08		/* Address of trickle charge register */
58 	*bp++ = bin2bcd(time->tm_sec);  in ds1302_rtc_set_time()
59 	*bp++ = bin2bcd(time->tm_min);  in ds1302_rtc_set_time()
60 	*bp++ = bin2bcd(time->tm_hour);  in ds1302_rtc_set_time()
61 	*bp++ = bin2bcd(time->tm_mday);  in ds1302_rtc_set_time()
62 	*bp++ = bin2bcd(time->tm_mon + 1);  in ds1302_rtc_set_time()
63 	*bp++ = time->tm_wday + 1;  in ds1302_rtc_set_time()
64 	*bp++ = bin2bcd(time->tm_year % 100);  in ds1302_rtc_set_time()
67 	/* use write-then-read since dma from stack is nonportable */  in ds1302_rtc_set_time()
76 	u8		buf[RTC_CLCK_LEN - 1];  in ds1302_rtc_get_time()
79 	/* Use write-then-read to get all the date/time registers  in ds1302_rtc_get_time()
88 	time->tm_sec = bcd2bin(buf[RTC_ADDR_SEC]);  in ds1302_rtc_get_time()
89 	time->tm_min = bcd2bin(buf[RTC_ADDR_MIN]);  in ds1302_rtc_get_time()
90 	time->tm_hour = bcd2bin(buf[RTC_ADDR_HOUR]);  in ds1302_rtc_get_time()
91 	time->tm_wday = buf[RTC_ADDR_DAY] - 1;  in ds1302_rtc_get_time()
92 	time->tm_mday = bcd2bin(buf[RTC_ADDR_DATE]);  in ds1302_rtc_get_time()
93 	time->tm_mon = bcd2bin(buf[RTC_ADDR_MON]) - 1;  in ds1302_rtc_get_time()
94 	time->tm_year = bcd2bin(buf[RTC_ADDR_YEAR]) + 100;  in ds1302_rtc_get_time()
116 	if (spi->bits_per_word && (spi->bits_per_word != 8)) {  in ds1302_probe()
117 		dev_err(&spi->dev, "bad word length\n");  in ds1302_probe()
118 		return -EINVAL;  in ds1302_probe()
119 	} else if (spi->max_speed_hz > 2000000) {  in ds1302_probe()
120 		dev_err(&spi->dev, "speed is too high\n");  in ds1302_probe()
121 		return -EINVAL;  in ds1302_probe()
122 	} else if (spi->mode & SPI_CPHA) {  in ds1302_probe()
123 		dev_err(&spi->dev, "bad mode\n");  in ds1302_probe()
124 		return -EINVAL;  in ds1302_probe()
130 		dev_err(&spi->dev, "control register read error %d\n",  in ds1302_probe()
138 			dev_err(&spi->dev, "control register read error %d\n",  in ds1302_probe()
144 			dev_err(&spi->dev, "junk in control register\n");  in ds1302_probe()
145 			return -ENODEV;  in ds1302_probe()
155 			dev_err(&spi->dev, "control register write error %d\n",  in ds1302_probe()
163 			dev_err(&spi->dev,  in ds1302_probe()
170 			dev_err(&spi->dev, "failed to detect chip\n");  in ds1302_probe()
171 			return -ENODEV;  in ds1302_probe()
177 	rtc = devm_rtc_device_register(&spi->dev, "ds1302",  in ds1302_probe()
181 		dev_err(&spi->dev, "error %d registering rtc\n", status);  in ds1302_probe()
203 	.driver.name	= "rtc-ds1302",