1 // SPDX-License-Identifier: GPL-2.0-only
8  * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)
9  * Copyright 2005-06 Tower Technologies
68  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
79 	 * time and date then re-read the "update flag". If the update flag  in rx8581_rtc_read_time()
83 	err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);  in rx8581_rtc_read_time()
90 		return -EINVAL;  in rx8581_rtc_read_time()
96 			err = regmap_write(rx8581->regmap, RX8581_REG_FLAG,  in rx8581_rtc_read_time()
103 		err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date,  in rx8581_rtc_read_time()
109 		err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);  in rx8581_rtc_read_time()
119 	tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F);  in rx8581_rtc_read_time()
120 	tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F);  in rx8581_rtc_read_time()
121 	tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */  in rx8581_rtc_read_time()
122 	tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);  in rx8581_rtc_read_time()
123 	tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);  in rx8581_rtc_read_time()
124 	tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */  in rx8581_rtc_read_time()
125 	tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100;  in rx8581_rtc_read_time()
127 	dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "  in rx8581_rtc_read_time()
130 		tm->tm_sec, tm->tm_min, tm->tm_hour,  in rx8581_rtc_read_time()
131 		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);  in rx8581_rtc_read_time()
143 	dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "  in rx8581_rtc_set_time()
146 		tm->tm_sec, tm->tm_min, tm->tm_hour,  in rx8581_rtc_set_time()
147 		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);  in rx8581_rtc_set_time()
149 	/* hours, minutes and seconds */  in rx8581_rtc_set_time()
150 	buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec);  in rx8581_rtc_set_time()
151 	buf[RX8581_REG_MN] = bin2bcd(tm->tm_min);  in rx8581_rtc_set_time()
152 	buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour);  in rx8581_rtc_set_time()
154 	buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday);  in rx8581_rtc_set_time()
156 	/* month, 1 - 12 */  in rx8581_rtc_set_time()
157 	buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);  in rx8581_rtc_set_time()
160 	buf[RX8581_REG_YR] = bin2bcd(tm->tm_year - 100);  in rx8581_rtc_set_time()
161 	buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);  in rx8581_rtc_set_time()
164 	err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,  in rx8581_rtc_set_time()
170 	err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC,  in rx8581_rtc_set_time()
176 	err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG,  in rx8581_rtc_set_time()
182 	return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,  in rx8581_rtc_set_time()
196 	return regmap_bulk_read(rx8581->regmap, RX8571_USER_RAM + offset,  in rx8571_nvram_read()
205 	return regmap_bulk_write(rx8581->regmap, RX8571_USER_RAM + offset,  in rx8571_nvram_write()
216 	ret = regmap_read(rx8581->regmap, RX8581_REG_RAM, &tmp_val);  in rx85x1_nvram_read()
229 	return regmap_write(rx8581->regmap, RX8581_REG_RAM,  in rx85x1_nvram_write()
255 	const void *data = of_device_get_match_data(&client->dev);  in rx8581_probe()
258 			.name = "rx85x1-",  in rx8581_probe()
265 			.name = "rx8571-",  in rx8581_probe()
275 	dev_dbg(&client->dev, "%s\n", __func__);  in rx8581_probe()
280 	rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);  in rx8581_probe()
282 		return -ENOMEM;  in rx8581_probe()
286 	rx8581->regmap = devm_regmap_init_i2c(client, &config->regmap);  in rx8581_probe()
287 	if (IS_ERR(rx8581->regmap))  in rx8581_probe()
288 		return PTR_ERR(rx8581->regmap);  in rx8581_probe()
290 	rx8581->rtc = devm_rtc_allocate_device(&client->dev);  in rx8581_probe()
291 	if (IS_ERR(rx8581->rtc))  in rx8581_probe()
292 		return PTR_ERR(rx8581->rtc);  in rx8581_probe()
294 	rx8581->rtc->ops = &rx8581_rtc_ops;  in rx8581_probe()
295 	rx8581->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;  in rx8581_probe()
296 	rx8581->rtc->range_max = RTC_TIMESTAMP_END_2099;  in rx8581_probe()
297 	rx8581->rtc->start_secs = 0;  in rx8581_probe()
298 	rx8581->rtc->set_start_time = true;  in rx8581_probe()
300 	ret = devm_rtc_register_device(rx8581->rtc);  in rx8581_probe()
302 	for (i = 0; i < config->num_nvram; i++) {  in rx8581_probe()
304 		devm_rtc_nvmem_register(rx8581->rtc, &nvmem_cfg[i]);  in rx8581_probe()
325 		.name	= "rtc-rx8581",
335 MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver");