Lines Matching full:rtc
2 * RTC subsystem, base class
18 #include <linux/rtc.h>
24 #include "rtc-core.h"
32 struct rtc_device *rtc = to_rtc_device(dev); in rtc_device_release() local
33 ida_simple_remove(&rtc_ida, rtc->id); in rtc_device_release()
34 kfree(rtc); in rtc_device_release()
38 /* Result of the last RTC to system clock attempt. */
44 * On suspend(), measure the delta between one RTC and the
53 struct rtc_device *rtc = to_rtc_device(dev); in rtc_suspend() local
61 if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0) in rtc_suspend()
64 /* snapshot the current RTC and system time at suspend*/ in rtc_suspend()
65 err = rtc_read_time(rtc, &tm); in rtc_suspend()
67 pr_debug("%s: fail to read rtc time\n", dev_name(&rtc->dev)); in rtc_suspend()
79 * and rtc time stays close to constant. in rtc_suspend()
99 struct rtc_device *rtc = to_rtc_device(dev); in rtc_resume() local
109 if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0) in rtc_resume()
112 /* snapshot the current rtc and system time at resume */ in rtc_resume()
114 err = rtc_read_time(rtc, &tm); in rtc_resume()
116 pr_debug("%s: fail to read rtc time\n", dev_name(&rtc->dev)); in rtc_resume()
124 pr_debug("%s: time travel!\n", dev_name(&rtc->dev)); in rtc_resume()
128 /* calculate the RTC time delta (sleep time)*/ in rtc_resume()
132 * Since these RTC suspend/resume handlers are not called in rtc_resume()
156 struct rtc_device *rtc; in rtc_allocate_device() local
158 rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); in rtc_allocate_device()
159 if (!rtc) in rtc_allocate_device()
162 device_initialize(&rtc->dev); in rtc_allocate_device()
165 rtc->set_offset_nsec = NSEC_PER_SEC / 2; in rtc_allocate_device()
167 rtc->irq_freq = 1; in rtc_allocate_device()
168 rtc->max_user_freq = 64; in rtc_allocate_device()
169 rtc->dev.class = rtc_class; in rtc_allocate_device()
170 rtc->dev.groups = rtc_get_dev_attribute_groups(); in rtc_allocate_device()
171 rtc->dev.release = rtc_device_release; in rtc_allocate_device()
173 mutex_init(&rtc->ops_lock); in rtc_allocate_device()
174 spin_lock_init(&rtc->irq_lock); in rtc_allocate_device()
175 init_waitqueue_head(&rtc->irq_queue); in rtc_allocate_device()
178 timerqueue_init_head(&rtc->timerqueue); in rtc_allocate_device()
179 INIT_WORK(&rtc->irqwork, rtc_timer_do_work); in rtc_allocate_device()
181 rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc); in rtc_allocate_device()
183 rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc); in rtc_allocate_device()
185 hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); in rtc_allocate_device()
186 rtc->pie_timer.function = rtc_pie_update_irq; in rtc_allocate_device()
187 rtc->pie_enabled = 0; in rtc_allocate_device()
189 return rtc; in rtc_allocate_device()
197 of_id = of_alias_get_id(dev->of_node, "rtc"); in rtc_device_get_id()
199 of_id = of_alias_get_id(dev->parent->of_node, "rtc"); in rtc_device_get_id()
213 static void rtc_device_get_offset(struct rtc_device *rtc) in rtc_device_get_offset() argument
220 * If RTC driver did not implement the range of RTC hardware device, in rtc_device_get_offset()
221 * then we can not expand the RTC range by adding or subtracting one in rtc_device_get_offset()
224 if (rtc->range_min == rtc->range_max) in rtc_device_get_offset()
227 ret = device_property_read_u32(rtc->dev.parent, "start-year", in rtc_device_get_offset()
230 rtc->start_secs = mktime64(start_year, 1, 1, 0, 0, 0); in rtc_device_get_offset()
231 rtc->set_start_time = true; in rtc_device_get_offset()
235 * If user did not implement the start time for RTC driver, then no in rtc_device_get_offset()
236 * need to expand the RTC range. in rtc_device_get_offset()
238 if (!rtc->set_start_time) in rtc_device_get_offset()
241 range_secs = rtc->range_max - rtc->range_min + 1; in rtc_device_get_offset()
244 * If the start_secs is larger than the maximum seconds (rtc->range_max) in rtc_device_get_offset()
245 * supported by RTC hardware or the maximum seconds of new expanded in rtc_device_get_offset()
246 * range (start_secs + rtc->range_max - rtc->range_min) is less than in rtc_device_get_offset()
247 * rtc->range_min, which means the minimum seconds (rtc->range_min) of in rtc_device_get_offset()
248 * RTC hardware will be mapped to start_secs by adding one offset, so in rtc_device_get_offset()
250 * rtc->offset_secs = rtc->start_secs - rtc->range_min; in rtc_device_get_offset()
252 * If the start_secs is larger than the minimum seconds (rtc->range_min) in rtc_device_get_offset()
253 * supported by RTC hardware, then there is one region is overlapped in rtc_device_get_offset()
254 * between the original RTC hardware range and the new expanded range, in rtc_device_get_offset()
256 * expanded range due to it is valid for RTC device. So the minimum in rtc_device_get_offset()
257 * seconds of RTC hardware (rtc->range_min) should be mapped to in rtc_device_get_offset()
258 * rtc->range_max + 1, then the offset seconds formula should be: in rtc_device_get_offset()
259 * rtc->offset_secs = rtc->range_max - rtc->range_min + 1; in rtc_device_get_offset()
261 * If the start_secs is less than the minimum seconds (rtc->range_min), in rtc_device_get_offset()
263 * start_secs + rtc->range_max - rtc->range_min + 1, then the in rtc_device_get_offset()
265 * rtc->offset_secs = -(rtc->range_max - rtc->range_min + 1); in rtc_device_get_offset()
269 if (rtc->start_secs > rtc->range_max || in rtc_device_get_offset()
270 rtc->start_secs + range_secs - 1 < rtc->range_min) in rtc_device_get_offset()
271 rtc->offset_secs = rtc->start_secs - rtc->range_min; in rtc_device_get_offset()
272 else if (rtc->start_secs > rtc->range_min) in rtc_device_get_offset()
273 rtc->offset_secs = range_secs; in rtc_device_get_offset()
274 else if (rtc->start_secs < rtc->range_min) in rtc_device_get_offset()
275 rtc->offset_secs = -range_secs; in rtc_device_get_offset()
277 rtc->offset_secs = 0; in rtc_device_get_offset()
281 * rtc_device_register - register w/ RTC class
293 struct rtc_device *rtc; in rtc_device_register() local
303 rtc = rtc_allocate_device(); in rtc_device_register()
304 if (!rtc) { in rtc_device_register()
309 rtc->id = id; in rtc_device_register()
310 rtc->ops = ops; in rtc_device_register()
311 rtc->owner = owner; in rtc_device_register()
312 rtc->dev.parent = dev; in rtc_device_register()
314 dev_set_name(&rtc->dev, "rtc%d", id); in rtc_device_register()
316 rtc_device_get_offset(rtc); in rtc_device_register()
319 err = __rtc_read_alarm(rtc, &alrm); in rtc_device_register()
322 rtc_initialize_alarm(rtc, &alrm); in rtc_device_register()
324 rtc_dev_prepare(rtc); in rtc_device_register()
326 err = cdev_device_add(&rtc->char_dev, &rtc->dev); in rtc_device_register()
328 dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n", in rtc_device_register()
329 name, MAJOR(rtc->dev.devt), rtc->id); in rtc_device_register()
332 put_device(&rtc->dev); in rtc_device_register()
335 dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", name, in rtc_device_register()
336 MAJOR(rtc->dev.devt), rtc->id); in rtc_device_register()
339 rtc_proc_add_device(rtc); in rtc_device_register()
341 dev_info(dev, "rtc core: registered %s as %s\n", in rtc_device_register()
342 name, dev_name(&rtc->dev)); in rtc_device_register()
344 return rtc; in rtc_device_register()
350 dev_err(dev, "rtc core: unable to register %s, err = %d\n", in rtc_device_register()
358 * rtc_device_unregister - removes the previously registered RTC class device
360 * @rtc: the RTC class device to destroy
362 void rtc_device_unregister(struct rtc_device *rtc) in rtc_device_unregister() argument
364 mutex_lock(&rtc->ops_lock); in rtc_device_unregister()
366 * Remove innards of this RTC, then disable it, before in rtc_device_unregister()
369 rtc_proc_del_device(rtc); in rtc_device_unregister()
370 cdev_device_del(&rtc->char_dev, &rtc->dev); in rtc_device_unregister()
371 rtc->ops = NULL; in rtc_device_unregister()
372 mutex_unlock(&rtc->ops_lock); in rtc_device_unregister()
373 put_device(&rtc->dev); in rtc_device_unregister()
379 struct rtc_device *rtc = *(struct rtc_device **)res; in devm_rtc_device_release() local
381 rtc_nvmem_unregister(rtc); in devm_rtc_device_release()
382 rtc_device_unregister(rtc); in devm_rtc_device_release()
387 struct rtc **r = res; in devm_rtc_device_match()
396 * @ops: the rtc operations structure
399 * @return a struct rtc on success, or an ERR_PTR on error
411 struct rtc_device **ptr, *rtc; in devm_rtc_device_register() local
417 rtc = rtc_device_register(name, dev, ops, owner); in devm_rtc_device_register()
418 if (!IS_ERR(rtc)) { in devm_rtc_device_register()
419 *ptr = rtc; in devm_rtc_device_register()
425 return rtc; in devm_rtc_device_register()
432 * @rtc: the RTC class device to unregister
434 * Deallocated a rtc allocated with devm_rtc_device_register(). Normally this
438 void devm_rtc_device_unregister(struct device *dev, struct rtc_device *rtc) in devm_rtc_device_unregister() argument
443 devm_rtc_device_match, rtc); in devm_rtc_device_unregister()
450 struct rtc_device *rtc = *(struct rtc_device **)res; in devm_rtc_release_device() local
452 rtc_nvmem_unregister(rtc); in devm_rtc_release_device()
454 if (rtc->registered) in devm_rtc_release_device()
455 rtc_device_unregister(rtc); in devm_rtc_release_device()
457 put_device(&rtc->dev); in devm_rtc_release_device()
462 struct rtc_device **ptr, *rtc; in devm_rtc_allocate_device() local
475 rtc = rtc_allocate_device(); in devm_rtc_allocate_device()
476 if (!rtc) { in devm_rtc_allocate_device()
481 *ptr = rtc; in devm_rtc_allocate_device()
484 rtc->id = id; in devm_rtc_allocate_device()
485 rtc->dev.parent = dev; in devm_rtc_allocate_device()
486 dev_set_name(&rtc->dev, "rtc%d", id); in devm_rtc_allocate_device()
488 return rtc; in devm_rtc_allocate_device()
498 int __rtc_register_device(struct module *owner, struct rtc_device *rtc) in __rtc_register_device() argument
503 if (!rtc->ops) in __rtc_register_device()
506 rtc->owner = owner; in __rtc_register_device()
507 rtc_device_get_offset(rtc); in __rtc_register_device()
510 err = __rtc_read_alarm(rtc, &alrm); in __rtc_register_device()
512 rtc_initialize_alarm(rtc, &alrm); in __rtc_register_device()
514 rtc_dev_prepare(rtc); in __rtc_register_device()
516 err = cdev_device_add(&rtc->char_dev, &rtc->dev); in __rtc_register_device()
518 dev_warn(rtc->dev.parent, "failed to add char device %d:%d\n", in __rtc_register_device()
519 MAJOR(rtc->dev.devt), rtc->id); in __rtc_register_device()
521 dev_dbg(rtc->dev.parent, "char device (%d:%d)\n", in __rtc_register_device()
522 MAJOR(rtc->dev.devt), rtc->id); in __rtc_register_device()
524 rtc_proc_add_device(rtc); in __rtc_register_device()
526 rtc->registered = true; in __rtc_register_device()
527 dev_info(rtc->dev.parent, "registered as %s\n", in __rtc_register_device()
528 dev_name(&rtc->dev)); in __rtc_register_device()
536 rtc_class = class_create(THIS_MODULE, "rtc"); in rtc_init()