Commit | Line | Data |
---|---|---|
0c86edc0 AZ |
1 | /* |
2 | * RTC subsystem, interface functions | |
3 | * | |
4 | * Copyright (C) 2005 Tower Technologies | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * | |
7 | * based on arch/arm/common/rtctime.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/rtc.h> | |
97144c67 | 15 | #include <linux/log2.h> |
0c86edc0 | 16 | |
ab6a2d70 | 17 | int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) |
0c86edc0 AZ |
18 | { |
19 | int err; | |
0c86edc0 AZ |
20 | |
21 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
22 | if (err) | |
b68bb263 | 23 | return err; |
0c86edc0 AZ |
24 | |
25 | if (!rtc->ops) | |
26 | err = -ENODEV; | |
27 | else if (!rtc->ops->read_time) | |
28 | err = -EINVAL; | |
29 | else { | |
30 | memset(tm, 0, sizeof(struct rtc_time)); | |
cd966209 | 31 | err = rtc->ops->read_time(rtc->dev.parent, tm); |
0c86edc0 AZ |
32 | } |
33 | ||
34 | mutex_unlock(&rtc->ops_lock); | |
35 | return err; | |
36 | } | |
37 | EXPORT_SYMBOL_GPL(rtc_read_time); | |
38 | ||
ab6a2d70 | 39 | int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm) |
0c86edc0 AZ |
40 | { |
41 | int err; | |
0c86edc0 AZ |
42 | |
43 | err = rtc_valid_tm(tm); | |
44 | if (err != 0) | |
45 | return err; | |
46 | ||
47 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
48 | if (err) | |
b68bb263 | 49 | return err; |
0c86edc0 AZ |
50 | |
51 | if (!rtc->ops) | |
52 | err = -ENODEV; | |
bbccf83f | 53 | else if (rtc->ops->set_time) |
cd966209 | 54 | err = rtc->ops->set_time(rtc->dev.parent, tm); |
bbccf83f AZ |
55 | else if (rtc->ops->set_mmss) { |
56 | unsigned long secs; | |
57 | err = rtc_tm_to_time(tm, &secs); | |
58 | if (err == 0) | |
59 | err = rtc->ops->set_mmss(rtc->dev.parent, secs); | |
60 | } else | |
61 | err = -EINVAL; | |
0c86edc0 AZ |
62 | |
63 | mutex_unlock(&rtc->ops_lock); | |
64 | return err; | |
65 | } | |
66 | EXPORT_SYMBOL_GPL(rtc_set_time); | |
67 | ||
ab6a2d70 | 68 | int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs) |
0c86edc0 AZ |
69 | { |
70 | int err; | |
0c86edc0 AZ |
71 | |
72 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
73 | if (err) | |
b68bb263 | 74 | return err; |
0c86edc0 AZ |
75 | |
76 | if (!rtc->ops) | |
77 | err = -ENODEV; | |
78 | else if (rtc->ops->set_mmss) | |
cd966209 | 79 | err = rtc->ops->set_mmss(rtc->dev.parent, secs); |
0c86edc0 AZ |
80 | else if (rtc->ops->read_time && rtc->ops->set_time) { |
81 | struct rtc_time new, old; | |
82 | ||
cd966209 | 83 | err = rtc->ops->read_time(rtc->dev.parent, &old); |
0c86edc0 AZ |
84 | if (err == 0) { |
85 | rtc_time_to_tm(secs, &new); | |
86 | ||
87 | /* | |
88 | * avoid writing when we're going to change the day of | |
89 | * the month. We will retry in the next minute. This | |
90 | * basically means that if the RTC must not drift | |
91 | * by more than 1 minute in 11 minutes. | |
92 | */ | |
93 | if (!((old.tm_hour == 23 && old.tm_min == 59) || | |
94 | (new.tm_hour == 23 && new.tm_min == 59))) | |
cd966209 | 95 | err = rtc->ops->set_time(rtc->dev.parent, |
ab6a2d70 | 96 | &new); |
0c86edc0 AZ |
97 | } |
98 | } | |
99 | else | |
100 | err = -EINVAL; | |
101 | ||
102 | mutex_unlock(&rtc->ops_lock); | |
103 | ||
104 | return err; | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(rtc_set_mmss); | |
107 | ||
0e36a9a4 | 108 | static int rtc_read_alarm_internal(struct rtc_device *rtc, struct rtc_wkalrm *alarm) |
0c86edc0 AZ |
109 | { |
110 | int err; | |
0c86edc0 AZ |
111 | |
112 | err = mutex_lock_interruptible(&rtc->ops_lock); | |
113 | if (err) | |
b68bb263 | 114 | return err; |
0c86edc0 AZ |
115 | |
116 | if (rtc->ops == NULL) | |
117 | err = -ENODEV; | |
118 | else if (!rtc->ops->read_alarm) | |
119 | err = -EINVAL; | |
120 | else { | |
121 | memset(alarm, 0, sizeof(struct rtc_wkalrm)); | |
cd966209 | 122 | err = rtc->ops->read_alarm(rtc->dev.parent, alarm); |
0c86edc0 AZ |
123 | } |
124 | ||
125 | mutex_unlock(&rtc->ops_lock); | |
126 | return err; | |
127 | } | |
0e36a9a4 ML |
128 | |
129 | int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) | |
130 | { | |
131 | int err; | |
132 | struct rtc_time before, now; | |
133 | int first_time = 1; | |
a01cc657 DB |
134 | unsigned long t_now, t_alm; |
135 | enum { none, day, month, year } missing = none; | |
136 | unsigned days; | |
0e36a9a4 | 137 | |
a01cc657 DB |
138 | /* The lower level RTC driver may return -1 in some fields, |
139 | * creating invalid alarm->time values, for reasons like: | |
140 | * | |
141 | * - The hardware may not be capable of filling them in; | |
142 | * many alarms match only on time-of-day fields, not | |
143 | * day/month/year calendar data. | |
144 | * | |
145 | * - Some hardware uses illegal values as "wildcard" match | |
146 | * values, which non-Linux firmware (like a BIOS) may try | |
147 | * to set up as e.g. "alarm 15 minutes after each hour". | |
148 | * Linux uses only oneshot alarms. | |
149 | * | |
150 | * When we see that here, we deal with it by using values from | |
151 | * a current RTC timestamp for any missing (-1) values. The | |
152 | * RTC driver prevents "periodic alarm" modes. | |
0e36a9a4 ML |
153 | * |
154 | * But this can be racey, because some fields of the RTC timestamp | |
155 | * may have wrapped in the interval since we read the RTC alarm, | |
156 | * which would lead to us inserting inconsistent values in place | |
157 | * of the -1 fields. | |
158 | * | |
159 | * Reading the alarm and timestamp in the reverse sequence | |
160 | * would have the same race condition, and not solve the issue. | |
161 | * | |
162 | * So, we must first read the RTC timestamp, | |
163 | * then read the RTC alarm value, | |
164 | * and then read a second RTC timestamp. | |
165 | * | |
166 | * If any fields of the second timestamp have changed | |
167 | * when compared with the first timestamp, then we know | |
168 | * our timestamp may be inconsistent with that used by | |
169 | * the low-level rtc_read_alarm_internal() function. | |
170 | * | |
171 | * So, when the two timestamps disagree, we just loop and do | |
172 | * the process again to get a fully consistent set of values. | |
173 | * | |
174 | * This could all instead be done in the lower level driver, | |
175 | * but since more than one lower level RTC implementation needs it, | |
176 | * then it's probably best best to do it here instead of there.. | |
177 | */ | |
178 | ||
179 | /* Get the "before" timestamp */ | |
180 | err = rtc_read_time(rtc, &before); | |
181 | if (err < 0) | |
182 | return err; | |
183 | do { | |
184 | if (!first_time) | |
185 | memcpy(&before, &now, sizeof(struct rtc_time)); | |
186 | first_time = 0; | |
187 | ||
188 | /* get the RTC alarm values, which may be incomplete */ | |
189 | err = rtc_read_alarm_internal(rtc, alarm); | |
190 | if (err) | |
191 | return err; | |
192 | if (!alarm->enabled) | |
193 | return 0; | |
194 | ||
a01cc657 DB |
195 | /* full-function RTCs won't have such missing fields */ |
196 | if (rtc_valid_tm(&alarm->time) == 0) | |
197 | return 0; | |
198 | ||
0e36a9a4 ML |
199 | /* get the "after" timestamp, to detect wrapped fields */ |
200 | err = rtc_read_time(rtc, &now); | |
201 | if (err < 0) | |
202 | return err; | |
203 | ||
204 | /* note that tm_sec is a "don't care" value here: */ | |
205 | } while ( before.tm_min != now.tm_min | |
206 | || before.tm_hour != now.tm_hour | |
207 | || before.tm_mon != now.tm_mon | |
a01cc657 | 208 | || before.tm_year != now.tm_year); |
0e36a9a4 | 209 | |
a01cc657 DB |
210 | /* Fill in the missing alarm fields using the timestamp; we |
211 | * know there's at least one since alarm->time is invalid. | |
212 | */ | |
0e36a9a4 ML |
213 | if (alarm->time.tm_sec == -1) |
214 | alarm->time.tm_sec = now.tm_sec; | |
215 | if (alarm->time.tm_min == -1) | |
216 | alarm->time.tm_min = now.tm_min; | |
217 | if (alarm->time.tm_hour == -1) | |
218 | alarm->time.tm_hour = now.tm_hour; | |
a01cc657 DB |
219 | |
220 | /* For simplicity, only support date rollover for now */ | |
221 | if (alarm->time.tm_mday == -1) { | |
0e36a9a4 | 222 | alarm->time.tm_mday = now.tm_mday; |
a01cc657 DB |
223 | missing = day; |
224 | } | |
225 | if (alarm->time.tm_mon == -1) { | |
0e36a9a4 | 226 | alarm->time.tm_mon = now.tm_mon; |
a01cc657 DB |
227 | if (missing == none) |
228 | missing = month; | |
229 | } | |
230 | if (alarm->time.tm_year == -1) { | |
0e36a9a4 | 231 | alarm->time.tm_year = now.tm_year; |
a01cc657 DB |
232 | if (missing == none) |
233 | missing = year; | |
234 | } | |
235 | ||
236 | /* with luck, no rollover is needed */ | |
237 | rtc_tm_to_time(&now, &t_now); | |
238 | rtc_tm_to_time(&alarm->time, &t_alm); | |
239 | if (t_now < t_alm) | |
240 | goto done; | |
241 | ||
242 | switch (missing) { | |
243 | ||
244 | /* 24 hour rollover ... if it's now 10am Monday, an alarm that | |
245 | * that will trigger at 5am will do so at 5am Tuesday, which | |
246 | * could also be in the next month or year. This is a common | |
247 | * case, especially for PCs. | |
248 | */ | |
249 | case day: | |
250 | dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day"); | |
251 | t_alm += 24 * 60 * 60; | |
252 | rtc_time_to_tm(t_alm, &alarm->time); | |
253 | break; | |
254 | ||
255 | /* Month rollover ... if it's the 31th, an alarm on the 3rd will | |
256 | * be next month. An alarm matching on the 30th, 29th, or 28th | |
257 | * may end up in the month after that! Many newer PCs support | |
258 | * this type of alarm. | |
259 | */ | |
260 | case month: | |
261 | dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month"); | |
262 | do { | |
263 | if (alarm->time.tm_mon < 11) | |
264 | alarm->time.tm_mon++; | |
265 | else { | |
266 | alarm->time.tm_mon = 0; | |
267 | alarm->time.tm_year++; | |
268 | } | |
269 | days = rtc_month_days(alarm->time.tm_mon, | |
270 | alarm->time.tm_year); | |
271 | } while (days < alarm->time.tm_mday); | |
272 | break; | |
273 | ||
274 | /* Year rollover ... easy except for leap years! */ | |
275 | case year: | |
276 | dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year"); | |
277 | do { | |
278 | alarm->time.tm_year++; | |
9e3a4afd | 279 | } while (rtc_valid_tm(&alarm->time) != 0); |
a01cc657 DB |
280 | break; |
281 | ||
282 | default: | |
283 | dev_warn(&rtc->dev, "alarm rollover not handled\n"); | |
284 | } | |
285 | ||
286 | done: | |
0e36a9a4 ML |
287 | return 0; |
288 | } | |
0c86edc0 AZ |
289 | EXPORT_SYMBOL_GPL(rtc_read_alarm); |
290 | ||
ab6a2d70 | 291 | int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) |
0c86edc0 AZ |
292 | { |
293 | int err; | |
0c86edc0 | 294 | |
f8245c26 DB |
295 | err = rtc_valid_tm(&alarm->time); |
296 | if (err != 0) | |
297 | return err; | |
298 | ||
0c86edc0 AZ |
299 | err = mutex_lock_interruptible(&rtc->ops_lock); |
300 | if (err) | |
b68bb263 | 301 | return err; |
0c86edc0 AZ |
302 | |
303 | if (!rtc->ops) | |
304 | err = -ENODEV; | |
305 | else if (!rtc->ops->set_alarm) | |
306 | err = -EINVAL; | |
307 | else | |
cd966209 | 308 | err = rtc->ops->set_alarm(rtc->dev.parent, alarm); |
0c86edc0 AZ |
309 | |
310 | mutex_unlock(&rtc->ops_lock); | |
311 | return err; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(rtc_set_alarm); | |
314 | ||
099e6576 AZ |
315 | int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled) |
316 | { | |
317 | int err = mutex_lock_interruptible(&rtc->ops_lock); | |
318 | if (err) | |
319 | return err; | |
320 | ||
321 | if (!rtc->ops) | |
322 | err = -ENODEV; | |
323 | else if (!rtc->ops->alarm_irq_enable) | |
324 | err = -EINVAL; | |
325 | else | |
326 | err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled); | |
327 | ||
328 | mutex_unlock(&rtc->ops_lock); | |
329 | return err; | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(rtc_alarm_irq_enable); | |
332 | ||
333 | int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) | |
334 | { | |
335 | int err = mutex_lock_interruptible(&rtc->ops_lock); | |
336 | if (err) | |
337 | return err; | |
338 | ||
339 | #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL | |
340 | if (enabled == 0 && rtc->uie_irq_active) { | |
341 | mutex_unlock(&rtc->ops_lock); | |
342 | return rtc_dev_update_irq_enable_emul(rtc, enabled); | |
343 | } | |
344 | #endif | |
345 | ||
346 | if (!rtc->ops) | |
347 | err = -ENODEV; | |
348 | else if (!rtc->ops->update_irq_enable) | |
349 | err = -EINVAL; | |
350 | else | |
351 | err = rtc->ops->update_irq_enable(rtc->dev.parent, enabled); | |
352 | ||
353 | mutex_unlock(&rtc->ops_lock); | |
354 | ||
355 | #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL | |
356 | /* | |
357 | * Enable emulation if the driver did not provide | |
358 | * the update_irq_enable function pointer or if returned | |
359 | * -EINVAL to signal that it has been configured without | |
360 | * interrupts or that are not available at the moment. | |
361 | */ | |
362 | if (err == -EINVAL) | |
363 | err = rtc_dev_update_irq_enable_emul(rtc, enabled); | |
364 | #endif | |
365 | return err; | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(rtc_update_irq_enable); | |
368 | ||
d728b1e6 DB |
369 | /** |
370 | * rtc_update_irq - report RTC periodic, alarm, and/or update irqs | |
ab6a2d70 | 371 | * @rtc: the rtc device |
d728b1e6 DB |
372 | * @num: how many irqs are being reported (usually one) |
373 | * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF | |
374 | * Context: in_interrupt(), irqs blocked | |
375 | */ | |
ab6a2d70 | 376 | void rtc_update_irq(struct rtc_device *rtc, |
0c86edc0 AZ |
377 | unsigned long num, unsigned long events) |
378 | { | |
0c86edc0 AZ |
379 | spin_lock(&rtc->irq_lock); |
380 | rtc->irq_data = (rtc->irq_data + (num << 8)) | events; | |
381 | spin_unlock(&rtc->irq_lock); | |
382 | ||
383 | spin_lock(&rtc->irq_task_lock); | |
384 | if (rtc->irq_task) | |
385 | rtc->irq_task->func(rtc->irq_task->private_data); | |
386 | spin_unlock(&rtc->irq_task_lock); | |
387 | ||
388 | wake_up_interruptible(&rtc->irq_queue); | |
389 | kill_fasync(&rtc->async_queue, SIGIO, POLL_IN); | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(rtc_update_irq); | |
392 | ||
71da8905 DY |
393 | static int __rtc_match(struct device *dev, void *data) |
394 | { | |
395 | char *name = (char *)data; | |
396 | ||
d4afc76c | 397 | if (strcmp(dev_name(dev), name) == 0) |
71da8905 DY |
398 | return 1; |
399 | return 0; | |
400 | } | |
401 | ||
ab6a2d70 | 402 | struct rtc_device *rtc_class_open(char *name) |
0c86edc0 | 403 | { |
cd966209 | 404 | struct device *dev; |
ab6a2d70 | 405 | struct rtc_device *rtc = NULL; |
0c86edc0 | 406 | |
695794ae | 407 | dev = class_find_device(rtc_class, NULL, name, __rtc_match); |
71da8905 DY |
408 | if (dev) |
409 | rtc = to_rtc_device(dev); | |
0c86edc0 | 410 | |
ab6a2d70 DB |
411 | if (rtc) { |
412 | if (!try_module_get(rtc->owner)) { | |
cd966209 | 413 | put_device(dev); |
ab6a2d70 DB |
414 | rtc = NULL; |
415 | } | |
0c86edc0 | 416 | } |
0c86edc0 | 417 | |
ab6a2d70 | 418 | return rtc; |
0c86edc0 AZ |
419 | } |
420 | EXPORT_SYMBOL_GPL(rtc_class_open); | |
421 | ||
ab6a2d70 | 422 | void rtc_class_close(struct rtc_device *rtc) |
0c86edc0 | 423 | { |
ab6a2d70 | 424 | module_put(rtc->owner); |
cd966209 | 425 | put_device(&rtc->dev); |
0c86edc0 AZ |
426 | } |
427 | EXPORT_SYMBOL_GPL(rtc_class_close); | |
428 | ||
ab6a2d70 | 429 | int rtc_irq_register(struct rtc_device *rtc, struct rtc_task *task) |
0c86edc0 AZ |
430 | { |
431 | int retval = -EBUSY; | |
0c86edc0 AZ |
432 | |
433 | if (task == NULL || task->func == NULL) | |
434 | return -EINVAL; | |
435 | ||
d691eb90 | 436 | /* Cannot register while the char dev is in use */ |
372a302e | 437 | if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags)) |
d691eb90 AZ |
438 | return -EBUSY; |
439 | ||
d728b1e6 | 440 | spin_lock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
441 | if (rtc->irq_task == NULL) { |
442 | rtc->irq_task = task; | |
443 | retval = 0; | |
444 | } | |
d728b1e6 | 445 | spin_unlock_irq(&rtc->irq_task_lock); |
0c86edc0 | 446 | |
372a302e | 447 | clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags); |
d691eb90 | 448 | |
0c86edc0 AZ |
449 | return retval; |
450 | } | |
451 | EXPORT_SYMBOL_GPL(rtc_irq_register); | |
452 | ||
ab6a2d70 | 453 | void rtc_irq_unregister(struct rtc_device *rtc, struct rtc_task *task) |
0c86edc0 | 454 | { |
d728b1e6 | 455 | spin_lock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
456 | if (rtc->irq_task == task) |
457 | rtc->irq_task = NULL; | |
d728b1e6 | 458 | spin_unlock_irq(&rtc->irq_task_lock); |
0c86edc0 AZ |
459 | } |
460 | EXPORT_SYMBOL_GPL(rtc_irq_unregister); | |
461 | ||
97144c67 DB |
462 | /** |
463 | * rtc_irq_set_state - enable/disable 2^N Hz periodic IRQs | |
464 | * @rtc: the rtc device | |
465 | * @task: currently registered with rtc_irq_register() | |
466 | * @enabled: true to enable periodic IRQs | |
467 | * Context: any | |
468 | * | |
469 | * Note that rtc_irq_set_freq() should previously have been used to | |
470 | * specify the desired frequency of periodic IRQ task->func() callbacks. | |
471 | */ | |
ab6a2d70 | 472 | int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled) |
0c86edc0 AZ |
473 | { |
474 | int err = 0; | |
475 | unsigned long flags; | |
0c86edc0 | 476 | |
56f10c63 AZ |
477 | if (rtc->ops->irq_set_state == NULL) |
478 | return -ENXIO; | |
479 | ||
0c86edc0 | 480 | spin_lock_irqsave(&rtc->irq_task_lock, flags); |
d691eb90 AZ |
481 | if (rtc->irq_task != NULL && task == NULL) |
482 | err = -EBUSY; | |
0c86edc0 | 483 | if (rtc->irq_task != task) |
d691eb90 | 484 | err = -EACCES; |
0c86edc0 AZ |
485 | spin_unlock_irqrestore(&rtc->irq_task_lock, flags); |
486 | ||
487 | if (err == 0) | |
cd966209 | 488 | err = rtc->ops->irq_set_state(rtc->dev.parent, enabled); |
0c86edc0 AZ |
489 | |
490 | return err; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(rtc_irq_set_state); | |
493 | ||
97144c67 DB |
494 | /** |
495 | * rtc_irq_set_freq - set 2^N Hz periodic IRQ frequency for IRQ | |
496 | * @rtc: the rtc device | |
497 | * @task: currently registered with rtc_irq_register() | |
498 | * @freq: positive frequency with which task->func() will be called | |
499 | * Context: any | |
500 | * | |
501 | * Note that rtc_irq_set_state() is used to enable or disable the | |
502 | * periodic IRQs. | |
503 | */ | |
ab6a2d70 | 504 | int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) |
0c86edc0 | 505 | { |
56f10c63 | 506 | int err = 0; |
0c86edc0 | 507 | unsigned long flags; |
0c86edc0 | 508 | |
56f10c63 AZ |
509 | if (rtc->ops->irq_set_freq == NULL) |
510 | return -ENXIO; | |
0c86edc0 AZ |
511 | |
512 | spin_lock_irqsave(&rtc->irq_task_lock, flags); | |
d691eb90 AZ |
513 | if (rtc->irq_task != NULL && task == NULL) |
514 | err = -EBUSY; | |
0c86edc0 | 515 | if (rtc->irq_task != task) |
d691eb90 | 516 | err = -EACCES; |
0c86edc0 AZ |
517 | spin_unlock_irqrestore(&rtc->irq_task_lock, flags); |
518 | ||
519 | if (err == 0) { | |
cd966209 | 520 | err = rtc->ops->irq_set_freq(rtc->dev.parent, freq); |
0c86edc0 AZ |
521 | if (err == 0) |
522 | rtc->irq_freq = freq; | |
523 | } | |
524 | return err; | |
525 | } | |
2601a464 | 526 | EXPORT_SYMBOL_GPL(rtc_irq_set_freq); |