1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) ST-Ericsson SA 2010
69 	/* Request a data read */  in ab8500_rtc_read_time()
135 	/* Request a data write */  in ab8500_rtc_set_time()
154 		alarm->enabled = 1;  in ab8500_rtc_read_alarm()
156 		alarm->enabled = 0;  in ab8500_rtc_read_alarm()
158 	alarm->pending = 0;  in ab8500_rtc_read_alarm()
171 	rtc_time64_to_tm(secs, &alarm->time);  in ab8500_rtc_read_alarm()
191 	secs = rtc_tm_to_time64(&alarm->time);  in ab8500_rtc_set_alarm()
196 	 * return -EINVAL, so UIE EMUL can take it up, incase of UIE_ON  in ab8500_rtc_set_alarm()
200 	if ((secs - cursec) < 59) {  in ab8500_rtc_set_alarm()
202 		return -EINVAL;  in ab8500_rtc_set_alarm()
219 	return ab8500_rtc_irq_enable(dev, alarm->enabled);  in ab8500_rtc_set_alarm()
222 static int ab8500_rtc_set_calibration(struct device *dev, int calibration)  in ab8500_rtc_set_calibration()  argument
228 	 * Check that the calibration value (which is in units of 0.5  in ab8500_rtc_set_calibration()
229 	 * parts-per-million) is in the AB8500's range for RtcCalibration  in ab8500_rtc_set_calibration()
230 	 * register. -128 (0x80) is not permitted because the AB8500 uses  in ab8500_rtc_set_calibration()
231 	 * a sign-bit rather than two's complement, so 0x80 is just another  in ab8500_rtc_set_calibration()
234 	if ((calibration < -127) || (calibration > 127)) {  in ab8500_rtc_set_calibration()
236 		return -EINVAL;  in ab8500_rtc_set_calibration()
240 	 * The AB8500 uses sign (in bit7) and magnitude (in bits0-7)  in ab8500_rtc_set_calibration()
244 	if (calibration >= 0)  in ab8500_rtc_set_calibration()
245 		rtccal = 0x7F & calibration;  in ab8500_rtc_set_calibration()
247 		rtccal = ~(calibration - 1) | 0x80;  in ab8500_rtc_set_calibration()
255 static int ab8500_rtc_get_calibration(struct device *dev, int *calibration)  in ab8500_rtc_get_calibration()  argument
264 		 * The AB8500 uses sign (in bit7) and magnitude (in bits0-7)  in ab8500_rtc_get_calibration()
269 			*calibration = 0 - (rtccal & 0x7F);  in ab8500_rtc_get_calibration()
271 			*calibration = 0x7F & rtccal;  in ab8500_rtc_get_calibration()
282 	int calibration = 0;  in ab8500_sysfs_store_rtc_calibration()  local
284 	if (sscanf(buf, " %i ", &calibration) != 1) {  in ab8500_sysfs_store_rtc_calibration()
285 		dev_err(dev, "Failed to store RTC calibration attribute\n");  in ab8500_sysfs_store_rtc_calibration()
286 		return -EINVAL;  in ab8500_sysfs_store_rtc_calibration()
289 	retval = ab8500_rtc_set_calibration(dev, calibration);  in ab8500_sysfs_store_rtc_calibration()
298 	int  calibration = 0;  in ab8500_sysfs_show_rtc_calibration()  local
300 	retval = ab8500_rtc_get_calibration(dev, &calibration);  in ab8500_sysfs_show_rtc_calibration()
302 		dev_err(dev, "Failed to read RTC calibration attribute\n");  in ab8500_sysfs_show_rtc_calibration()
307 	return sprintf(buf, "%d\n", calibration);  in ab8500_sysfs_show_rtc_calibration()
323 static irqreturn_t rtc_alarm_handler(int irq, void *data)  in rtc_alarm_handler()  argument
325 	struct rtc_device *rtc = data;  in rtc_alarm_handler()
328 	dev_dbg(&rtc->dev, "%s\n", __func__);  in rtc_alarm_handler()
343 	{ "ab8500-rtc", (kernel_ulong_t)&ab8500_rtc_ops, },
361 	err = abx500_mask_and_set_register_interruptible(&pdev->dev, AB8500_RTC,  in ab8500_rtc_probe()
369 	err = abx500_get_register_interruptible(&pdev->dev, AB8500_RTC,  in ab8500_rtc_probe()
376 		dev_err(&pdev->dev, "RTC supply failure\n");  in ab8500_rtc_probe()
377 		return -ENODEV;  in ab8500_rtc_probe()
380 	device_init_wakeup(&pdev->dev, true);  in ab8500_rtc_probe()
382 	rtc = devm_rtc_allocate_device(&pdev->dev);  in ab8500_rtc_probe()
386 	rtc->ops = (struct rtc_class_ops *)platid->driver_data;  in ab8500_rtc_probe()
388 	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,  in ab8500_rtc_probe()
390 			"ab8500-rtc", rtc);  in ab8500_rtc_probe()
394 	dev_pm_set_wake_irq(&pdev->dev, irq);  in ab8500_rtc_probe()
397 	rtc->uie_unsupported = 1;  in ab8500_rtc_probe()
399 	rtc->range_max = (1ULL << 24) * 60 - 1; // 24-bit minutes + 59 secs  in ab8500_rtc_probe()
400 	rtc->start_secs = RTC_TIMESTAMP_BEGIN_2000;  in ab8500_rtc_probe()
401 	rtc->set_start_time = true;  in ab8500_rtc_probe()
412 	dev_pm_clear_wake_irq(&pdev->dev);  in ab8500_rtc_remove()
413 	device_init_wakeup(&pdev->dev, false);  in ab8500_rtc_remove()
420 		.name = "ab8500-rtc",