Lines Matching full:rtc
3 * RTC subsystem, base class
15 #include <linux/rtc.h>
21 #include "rtc-core.h"
27 struct rtc_device *rtc = to_rtc_device(dev); in rtc_device_release() local
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()
40 kfree(rtc); in rtc_device_release()
44 /* Result of the last RTC to system clock attempt. */
47 /* IMPORTANT: the RTC only stores whole seconds. It is arbitrary
51 * in an rtc sync function, to read both xtime.tv_sec and
58 static void rtc_hctosys(struct rtc_device *rtc) in rtc_hctosys() argument
66 err = rtc_read_time(rtc, &tm); in rtc_hctosys()
68 dev_err(rtc->dev.parent, in rtc_hctosys()
84 dev_info(rtc->dev.parent, "setting system clock to %ptR UTC (%lld)\n", in rtc_hctosys()
94 * On suspend(), measure the delta between one RTC and the
102 struct rtc_device *rtc = to_rtc_device(dev); in rtc_suspend() local
110 if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0) in rtc_suspend()
113 /* snapshot the current RTC and system time at suspend*/ in rtc_suspend()
114 err = rtc_read_time(rtc, &tm); in rtc_suspend()
116 pr_debug("%s: fail to read rtc time\n", dev_name(&rtc->dev)); in rtc_suspend()
127 * and rtc time stays close to constant. in rtc_suspend()
147 struct rtc_device *rtc = to_rtc_device(dev); in rtc_resume() local
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()
162 err = rtc_read_time(rtc, &tm); 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()
176 /* calculate the RTC time delta (sleep time)*/ in rtc_resume()
180 * Since these RTC suspend/resume handlers are not called in rtc_resume()
202 .name = "rtc",
209 struct rtc_device *rtc; in rtc_allocate_device() local
211 rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); in rtc_allocate_device()
212 if (!rtc) in rtc_allocate_device()
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()
249 return rtc; in rtc_allocate_device()
257 of_id = of_alias_get_id(dev->of_node, "rtc"); in rtc_device_get_id()
259 of_id = of_alias_get_id(dev->parent->of_node, "rtc"); in rtc_device_get_id()
273 static void rtc_device_get_offset(struct rtc_device *rtc) in rtc_device_get_offset() argument
280 * If RTC driver did not implement the range of RTC hardware device, in rtc_device_get_offset()
281 * then we can not expand the RTC range by adding or subtracting one 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()
295 * If user did not implement the start time for RTC driver, then no in rtc_device_get_offset()
296 * need to expand the RTC range. 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()
305 * supported by RTC hardware or the maximum seconds of new expanded 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()
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()
313 * supported by RTC hardware, then there is one region is overlapped in rtc_device_get_offset()
314 * between the original RTC hardware range and the new expanded range, in rtc_device_get_offset()
316 * expanded range due to it is valid for RTC device. So the minimum 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()
325 * rtc->offset_secs = -(rtc->range_max - rtc->range_min + 1); in rtc_device_get_offset()
329 if (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()
342 struct rtc_device *rtc = data; in devm_rtc_unregister_device() local
344 mutex_lock(&rtc->ops_lock); in devm_rtc_unregister_device()
346 * Remove innards of this RTC, then disable it, before in devm_rtc_unregister_device()
349 rtc_proc_del_device(rtc); 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()
358 struct rtc_device *rtc = res; in devm_rtc_release_device() local
360 put_device(&rtc->dev); in devm_rtc_release_device()
365 struct rtc_device *rtc; in devm_rtc_allocate_device() local
372 rtc = rtc_allocate_device(); in devm_rtc_allocate_device()
373 if (!rtc) { in devm_rtc_allocate_device()
378 rtc->id = id; in devm_rtc_allocate_device()
379 rtc->dev.parent = dev; in devm_rtc_allocate_device()
380 err = devm_add_action_or_reset(dev, devm_rtc_release_device, rtc); in devm_rtc_allocate_device()
384 err = dev_set_name(&rtc->dev, "rtc%d", id); in devm_rtc_allocate_device()
388 return rtc; in devm_rtc_allocate_device()
392 int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc) in __devm_rtc_register_device() argument
397 if (!rtc->ops) { in __devm_rtc_register_device()
398 dev_dbg(&rtc->dev, "no ops set\n"); 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()
409 rtc_device_get_offset(rtc); in __devm_rtc_register_device()
412 err = __rtc_read_alarm(rtc, &alrm); in __devm_rtc_register_device()
414 rtc_initialize_alarm(rtc, &alrm); in __devm_rtc_register_device()
416 rtc_dev_prepare(rtc); 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()
428 rtc_proc_add_device(rtc); 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()
435 rtc_hctosys(rtc); in __devm_rtc_register_device()
438 return devm_add_action_or_reset(rtc->dev.parent, in __devm_rtc_register_device()
439 devm_rtc_unregister_device, rtc); in __devm_rtc_register_device()
447 * @ops: the rtc operations structure
450 * @return a struct rtc on success, or an ERR_PTR on error
462 struct rtc_device *rtc; in devm_rtc_device_register() local
465 rtc = devm_rtc_allocate_device(dev); in devm_rtc_device_register()
466 if (IS_ERR(rtc)) in devm_rtc_device_register()
467 return rtc; in devm_rtc_device_register()
469 rtc->ops = ops; in devm_rtc_device_register()
471 err = __devm_rtc_register_device(owner, rtc); in devm_rtc_device_register()
475 return rtc; in devm_rtc_device_register()