1 // SPDX-License-Identifier: GPL-2.0
21 #include "rtc-core.h"
28 	struct timerqueue_head *head = &rtc->timerqueue;  in rtc_device_release()
31 	mutex_lock(&rtc->ops_lock);  in rtc_device_release()
34 	mutex_unlock(&rtc->ops_lock);  in rtc_device_release()
36 	cancel_work_sync(&rtc->irqwork);  in rtc_device_release()
38 	ida_free(&rtc_ida, rtc->id);  in rtc_device_release()
39 	mutex_destroy(&rtc->ops_lock);  in rtc_device_release()
45 int rtc_hctosys_ret = -ENODEV;
68 		dev_err(rtc->dev.parent,  in rtc_hctosys()
77 		err = -ERANGE;  in rtc_hctosys()
84 	dev_info(rtc->dev.parent, "setting system clock to %ptR UTC (%lld)\n",  in rtc_hctosys()
95  * system's wall clock; restore it on resume().
110 	if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)  in rtc_suspend()
116 		pr_debug("%s:  fail to read rtc time\n", dev_name(&rtc->dev));  in rtc_suspend()
131 	if (delta_delta.tv_sec < -2 || delta_delta.tv_sec >= 2) {  in rtc_suspend()
156 	rtc_hctosys_ret = -ENODEV;  in rtc_resume()
157 	if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)  in rtc_resume()
160 	/* snapshot the current rtc and system time at resume */  in rtc_resume()
164 		pr_debug("%s:  fail to read rtc time\n", dev_name(&rtc->dev));  in rtc_resume()
172 		pr_debug("%s:  time travel!\n", dev_name(&rtc->dev));  in rtc_resume()
180 	 * Since these RTC suspend/resume handlers are not called  in rtc_resume()
181 	 * at the very end of suspend or the start of resume,  in rtc_resume()
182 	 * some run-time may pass on either sides of the sleep time  in rtc_resume()
183 	 * so subtract kernel run-time between rtc_suspend to rtc_resume  in rtc_resume()
215 	device_initialize(&rtc->dev);  in rtc_allocate_device()
223 	rtc->set_offset_nsec = NSEC_PER_SEC + 5 * NSEC_PER_MSEC;  in rtc_allocate_device()
225 	rtc->irq_freq = 1;  in rtc_allocate_device()
226 	rtc->max_user_freq = 64;  in rtc_allocate_device()
227 	rtc->dev.class = &rtc_class;  in rtc_allocate_device()
228 	rtc->dev.groups = rtc_get_dev_attribute_groups();  in rtc_allocate_device()
229 	rtc->dev.release = rtc_device_release;  in rtc_allocate_device()
231 	mutex_init(&rtc->ops_lock);  in rtc_allocate_device()
232 	spin_lock_init(&rtc->irq_lock);  in rtc_allocate_device()
233 	init_waitqueue_head(&rtc->irq_queue);  in rtc_allocate_device()
236 	timerqueue_init_head(&rtc->timerqueue);  in rtc_allocate_device()
237 	INIT_WORK(&rtc->irqwork, rtc_timer_do_work);  in rtc_allocate_device()
239 	rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, rtc);  in rtc_allocate_device()
241 	rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, rtc);  in rtc_allocate_device()
243 	hrtimer_setup(&rtc->pie_timer, rtc_pie_update_irq, CLOCK_MONOTONIC, HRTIMER_MODE_REL);  in rtc_allocate_device()
244 	rtc->pie_enabled = 0;  in rtc_allocate_device()
246 	set_bit(RTC_FEATURE_ALARM, rtc->features);  in rtc_allocate_device()
247 	set_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);  in rtc_allocate_device()
254 	int of_id = -1, id = -1;  in rtc_device_get_id()
256 	if (dev->of_node)  in rtc_device_get_id()
257 		of_id = of_alias_get_id(dev->of_node, "rtc");  in rtc_device_get_id()
258 	else if (dev->parent && dev->parent->of_node)  in rtc_device_get_id()
259 		of_id = of_alias_get_id(dev->parent->of_node, "rtc");  in rtc_device_get_id()
282 	 * offset.  in rtc_device_get_offset()
284 	if (rtc->range_min == rtc->range_max)  in rtc_device_get_offset()
287 	ret = device_property_read_u32(rtc->dev.parent, "start-year",  in rtc_device_get_offset()
290 		rtc->start_secs = mktime64(start_year, 1, 1, 0, 0, 0);  in rtc_device_get_offset()
291 		rtc->set_start_time = true;  in rtc_device_get_offset()
298 	if (!rtc->set_start_time)  in rtc_device_get_offset()
301 	range_secs = rtc->range_max - rtc->range_min + 1;  in rtc_device_get_offset()
304 	 * If the start_secs is larger than the maximum seconds (rtc->range_max)  in rtc_device_get_offset()
306 	 * range (start_secs + rtc->range_max - rtc->range_min) is less than  in rtc_device_get_offset()
307 	 * rtc->range_min, which means the minimum seconds (rtc->range_min) of  in rtc_device_get_offset()
308 	 * RTC hardware will be mapped to start_secs by adding one offset, so  in rtc_device_get_offset()
309 	 * the offset seconds calculation formula should be:  in rtc_device_get_offset()
310 	 * rtc->offset_secs = rtc->start_secs - rtc->range_min;  in rtc_device_get_offset()
312 	 * If the start_secs is larger than the minimum seconds (rtc->range_min)  in rtc_device_get_offset()
317 	 * seconds of RTC hardware (rtc->range_min) should be mapped to  in rtc_device_get_offset()
318 	 * rtc->range_max + 1, then the offset seconds formula should be:  in rtc_device_get_offset()
319 	 * rtc->offset_secs = rtc->range_max - rtc->range_min + 1;  in rtc_device_get_offset()
321 	 * If the start_secs is less than the minimum seconds (rtc->range_min),  in rtc_device_get_offset()
323 	 * start_secs + rtc->range_max - rtc->range_min + 1, then the  in rtc_device_get_offset()
324 	 * offset seconds formula should be:  in rtc_device_get_offset()
325 	 * rtc->offset_secs = -(rtc->range_max - rtc->range_min + 1);  in rtc_device_get_offset()
327 	 * Otherwise the offset seconds should be 0.  in rtc_device_get_offset()
329 	if ((rtc->start_secs >= 0 && rtc->start_secs > rtc->range_max) ||  in rtc_device_get_offset()
330 	    rtc->start_secs + range_secs - 1 < rtc->range_min)  in rtc_device_get_offset()
331 		rtc->offset_secs = rtc->start_secs - rtc->range_min;  in rtc_device_get_offset()
332 	else if (rtc->start_secs > rtc->range_min)  in rtc_device_get_offset()
333 		rtc->offset_secs = range_secs;  in rtc_device_get_offset()
334 	else if (rtc->start_secs < rtc->range_min)  in rtc_device_get_offset()
335 		rtc->offset_secs = -range_secs;  in rtc_device_get_offset()
337 		rtc->offset_secs = 0;  in rtc_device_get_offset()
344 	mutex_lock(&rtc->ops_lock);  in devm_rtc_unregister_device()
350 	if (!test_bit(RTC_NO_CDEV, &rtc->flags))  in devm_rtc_unregister_device()
351 		cdev_device_del(&rtc->char_dev, &rtc->dev);  in devm_rtc_unregister_device()
352 	rtc->ops = NULL;  in devm_rtc_unregister_device()
353 	mutex_unlock(&rtc->ops_lock);  in devm_rtc_unregister_device()
360 	put_device(&rtc->dev);  in devm_rtc_release_device()
375 		return ERR_PTR(-ENOMEM);  in devm_rtc_allocate_device()
378 	rtc->id = id;  in devm_rtc_allocate_device()
379 	rtc->dev.parent = dev;  in devm_rtc_allocate_device()
384 	err = dev_set_name(&rtc->dev, "rtc%d", id);  in devm_rtc_allocate_device()
397 	if (!rtc->ops) {  in __devm_rtc_register_device()
398 		dev_dbg(&rtc->dev, "no ops set\n");  in __devm_rtc_register_device()
399 		return -EINVAL;  in __devm_rtc_register_device()
402 	if (!rtc->ops->set_alarm)  in __devm_rtc_register_device()
403 		clear_bit(RTC_FEATURE_ALARM, rtc->features);  in __devm_rtc_register_device()
405 	if (rtc->ops->set_offset)  in __devm_rtc_register_device()
406 		set_bit(RTC_FEATURE_CORRECTION, rtc->features);  in __devm_rtc_register_device()
408 	rtc->owner = owner;  in __devm_rtc_register_device()
418 	err = cdev_device_add(&rtc->char_dev, &rtc->dev);  in __devm_rtc_register_device()
420 		set_bit(RTC_NO_CDEV, &rtc->flags);  in __devm_rtc_register_device()
421 		dev_warn(rtc->dev.parent, "failed to add char device %d:%d\n",  in __devm_rtc_register_device()
422 			 MAJOR(rtc->dev.devt), rtc->id);  in __devm_rtc_register_device()
424 		dev_dbg(rtc->dev.parent, "char device (%d:%d)\n",  in __devm_rtc_register_device()
425 			MAJOR(rtc->dev.devt), rtc->id);  in __devm_rtc_register_device()
430 	dev_info(rtc->dev.parent, "registered as %s\n",  in __devm_rtc_register_device()
431 		 dev_name(&rtc->dev));  in __devm_rtc_register_device()
434 	if (!strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE))  in __devm_rtc_register_device()
438 	return devm_add_action_or_reset(rtc->dev.parent,  in __devm_rtc_register_device()
444  * devm_rtc_device_register - resource managed rtc_device_register()
469 	rtc->ops = ops;  in devm_rtc_device_register()