1 // SPDX-License-Identifier: GPL-2.0-only
3  * Micro Crystal RV-3029 / RV-3049 rtc class driver
5  * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
19 #include <linux/hwmon-sysfs.h>
106 #define RV3029_CONTROL_E2P_XOFFS_SIGN	BIT(7) /* Sign: 1->pos, 0->neg */
127 	for (i = 100; i > 0; i--) {  in rv3029_eeprom_busywait()
128 		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);  in rv3029_eeprom_busywait()
136 		dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");  in rv3029_eeprom_busywait()
137 		return -ETIMEDOUT;  in rv3029_eeprom_busywait()
145 	/* Re-enable eeprom refresh */  in rv3029_eeprom_exit()
146 	return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,  in rv3029_eeprom_exit()
157 	ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);  in rv3029_eeprom_enter()
161 		return -ENODEV;  in rv3029_eeprom_enter()
166 		ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,  in rv3029_eeprom_enter()
171 		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);  in rv3029_eeprom_enter()
175 			dev_err(rv3029->dev,  in rv3029_eeprom_enter()
176 				"Supply voltage is too low to safely access the EEPROM.\n");  in rv3029_eeprom_enter()
177 			return -ENODEV;  in rv3029_eeprom_enter()
182 	ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,  in rv3029_eeprom_enter()
204 	ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);  in rv3029_eeprom_read()
225 		ret = regmap_read(rv3029->regmap, reg, &tmp);  in rv3029_eeprom_write()
230 			ret = regmap_write(rv3029->regmap, reg, tmp);  in rv3029_eeprom_write()
272 	rtc_lock(rv3029->rtc);  in rv3029_handle_irq()
274 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);  in rv3029_handle_irq()
277 		rtc_unlock(rv3029->rtc);  in rv3029_handle_irq()
281 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);  in rv3029_handle_irq()
284 		rtc_unlock(rv3029->rtc);  in rv3029_handle_irq()
295 		rtc_update_irq(rv3029->rtc, 1, events);  in rv3029_handle_irq()
296 		regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);  in rv3029_handle_irq()
297 		regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);  in rv3029_handle_irq()
299 	rtc_unlock(rv3029->rtc);  in rv3029_handle_irq()
311 	ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);  in rv3029_read_time()
316 		return -EINVAL;  in rv3029_read_time()
318 	ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,  in rv3029_read_time()
323 	tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);  in rv3029_read_time()
324 	tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);  in rv3029_read_time()
328 		const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];  in rv3029_read_time()
332 			tm->tm_hour = bcd2bin(_hr & 0x1f);  in rv3029_read_time()
334 				tm->tm_hour += 12;  in rv3029_read_time()
336 			tm->tm_hour = bcd2bin(_hr & 0x3f);  in rv3029_read_time()
339 	tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);  in rv3029_read_time()
340 	tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;  in rv3029_read_time()
341 	tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;  in rv3029_read_time()
342 	tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;  in rv3029_read_time()
350 	struct rtc_time *const tm = &alarm->time;  in rv3029_read_alarm()
355 	ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,  in rv3029_read_alarm()
360 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);  in rv3029_read_alarm()
364 	ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);  in rv3029_read_alarm()
368 	tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);  in rv3029_read_alarm()
369 	tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);  in rv3029_read_alarm()
370 	tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);  in rv3029_read_alarm()
371 	tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);  in rv3029_read_alarm()
372 	tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;  in rv3029_read_alarm()
373 	tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;  in rv3029_read_alarm()
374 	tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;  in rv3029_read_alarm()
376 	alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);  in rv3029_read_alarm()
377 	alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;  in rv3029_read_alarm()
386 	return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,  in rv3029_alarm_irq_enable()
394 	struct rtc_time *const tm = &alarm->time;  in rv3029_set_alarm()
399 	regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;  in rv3029_set_alarm()
400 	regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;  in rv3029_set_alarm()
401 	regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)  in rv3029_set_alarm()
403 	regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)  in rv3029_set_alarm()
405 	regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)  in rv3029_set_alarm()
407 	regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)  in rv3029_set_alarm()
409 	regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))  in rv3029_set_alarm()
413 	ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,  in rv3029_set_alarm()
418 	return rv3029_alarm_irq_enable(dev, alarm->enabled);  in rv3029_set_alarm()
427 	regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);  in rv3029_set_time()
428 	regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);  in rv3029_set_time()
429 	regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);  in rv3029_set_time()
430 	regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);  in rv3029_set_time()
431 	regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);  in rv3029_set_time()
432 	regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;  in rv3029_set_time()
433 	regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);  in rv3029_set_time()
435 	ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,  in rv3029_set_time()
441 	return regmap_update_bits(rv3029->regmap, RV3029_STATUS,  in rv3029_set_time()
448 	unsigned long vl = 0;  in rv3029_ioctl()  local
453 		ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);  in rv3029_ioctl()
458 			vl = RTC_VL_ACCURACY_LOW;  in rv3029_ioctl()
461 			vl |= RTC_VL_DATA_INVALID;  in rv3029_ioctl()
463 		return put_user(vl, (unsigned int __user *)arg);  in rv3029_ioctl()
466 		return regmap_update_bits(rv3029->regmap, RV3029_STATUS,  in rv3029_ioctl()
470 		return -ENOIOCTLCMD;  in rv3029_ioctl()
546 	struct device_node *of_node = dev->of_node;  in rv3029_trickle_config()
556 	err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);  in rv3029_trickle_config()
564 			if (elem->r >= ohms)  in rv3029_trickle_config()
567 		trickle_set_bits = elem->conf;  in rv3029_trickle_config()
570 			 elem->r);  in rv3029_trickle_config()
586 	ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);  in rv3029_read_temp()
590 	*temp_mC = ((int)temp - 60) * 1000;  in rv3029_read_temp()
722 		return -ENOMEM;  in rv3029_probe()
724 	rv3029->regmap = regmap;  in rv3029_probe()
725 	rv3029->irq = irq;  in rv3029_probe()
726 	rv3029->dev = dev;  in rv3029_probe()
732 	rv3029->rtc = devm_rtc_allocate_device(dev);  in rv3029_probe()
733 	if (IS_ERR(rv3029->rtc))  in rv3029_probe()
734 		return PTR_ERR(rv3029->rtc);  in rv3029_probe()
736 	if (rv3029->irq > 0) {  in rv3029_probe()
737 		rc = devm_request_threaded_irq(dev, rv3029->irq,  in rv3029_probe()
743 			rv3029->irq = 0;  in rv3029_probe()
746 	if (!rv3029->irq)  in rv3029_probe()
747 		clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);  in rv3029_probe()
749 	rv3029->rtc->ops = &rv3029_rtc_ops;  in rv3029_probe()
750 	rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;  in rv3029_probe()
751 	rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;  in rv3029_probe()
753 	rc = devm_rtc_register_device(rv3029->rtc);  in rv3029_probe()
757 	nvmem_cfg.priv = rv3029->regmap;  in rv3029_probe()
758 	devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);  in rv3029_probe()
790 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |  in rv3029_i2c_probe()
792 		dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");  in rv3029_i2c_probe()
793 		return -ENODEV;  in rv3029_i2c_probe()
800 	return rv3029_probe(&client->dev, regmap, client->irq, client->name);  in rv3029_i2c_probe()
858 	return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");  in rv3049_probe()
914 MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");