Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * DS1286 Real Time Clock interface for Linux | |
3 | * | |
4 | * Copyright (C) 1998, 1999, 2000 Ralf Baechle | |
5 | * | |
6 | * Based on code written by Paul Gortmaker. | |
7 | * | |
8 | * This driver allows use of the real time clock (built into nearly all | |
9 | * computers) from user space. It exports the /dev/rtc interface supporting | |
10 | * various ioctl() and also the /proc/rtc pseudo-file for status | |
11 | * information. | |
12 | * | |
13 | * The ioctls can be used to set the interrupt behaviour and generation rate | |
14 | * from the RTC via IRQ 8. Then the /dev/rtc interface can be used to make | |
15 | * use of these timer interrupts, be they interval or alarm based. | |
16 | * | |
17 | * The /dev/rtc interface will block on reads until an interrupt has been | |
18 | * received. If a RTC interrupt has already happened, it will output an | |
19 | * unsigned long and then block. The output value contains the interrupt | |
20 | * status in the low byte and the number of interrupts since the last read | |
21 | * in the remaining high bytes. The /dev/rtc interface can also be used with | |
22 | * the select(2) call. | |
23 | * | |
24 | * This program is free software; you can redistribute it and/or modify it | |
25 | * under the terms of the GNU General Public License as published by the | |
26 | * Free Software Foundation; either version 2 of the License, or (at your | |
27 | * option) any later version. | |
28 | */ | |
29 | #include <linux/ds1286.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/miscdevice.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/rtc.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/bcd.h> | |
41 | #include <linux/proc_fs.h> | |
ac0e4b7d | 42 | #include <linux/jiffies.h> |
1da177e4 LT |
43 | |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/system.h> | |
46 | ||
47 | #define DS1286_VERSION "1.0" | |
48 | ||
49 | /* | |
50 | * We sponge a minor off of the misc major. No need slurping | |
51 | * up another valuable major dev number for this. If you add | |
52 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
53 | * ioctls. | |
54 | */ | |
55 | ||
56 | static DECLARE_WAIT_QUEUE_HEAD(ds1286_wait); | |
57 | ||
58 | static ssize_t ds1286_read(struct file *file, char *buf, | |
59 | size_t count, loff_t *ppos); | |
60 | ||
61 | static int ds1286_ioctl(struct inode *inode, struct file *file, | |
62 | unsigned int cmd, unsigned long arg); | |
63 | ||
64 | static unsigned int ds1286_poll(struct file *file, poll_table *wait); | |
65 | ||
66 | static void ds1286_get_alm_time (struct rtc_time *alm_tm); | |
67 | static void ds1286_get_time(struct rtc_time *rtc_tm); | |
68 | static int ds1286_set_time(struct rtc_time *rtc_tm); | |
69 | ||
70 | static inline unsigned char ds1286_is_updating(void); | |
71 | ||
72 | static DEFINE_SPINLOCK(ds1286_lock); | |
73 | ||
74 | static int ds1286_read_proc(char *page, char **start, off_t off, | |
75 | int count, int *eof, void *data); | |
76 | ||
77 | /* | |
78 | * Bits in rtc_status. (7 bits of room for future expansion) | |
79 | */ | |
80 | ||
81 | #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ | |
82 | #define RTC_TIMER_ON 0x02 /* missed irq timer active */ | |
83 | ||
84 | static unsigned char ds1286_status; /* bitmapped status byte. */ | |
85 | ||
86 | static unsigned char days_in_mo[] = { | |
87 | 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 | |
88 | }; | |
89 | ||
90 | /* | |
91 | * Now all the various file operations that we export. | |
92 | */ | |
93 | ||
94 | static ssize_t ds1286_read(struct file *file, char *buf, | |
95 | size_t count, loff_t *ppos) | |
96 | { | |
97 | return -EIO; | |
98 | } | |
99 | ||
100 | static int ds1286_ioctl(struct inode *inode, struct file *file, | |
101 | unsigned int cmd, unsigned long arg) | |
102 | { | |
103 | struct rtc_time wtime; | |
104 | ||
105 | switch (cmd) { | |
106 | case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ | |
107 | { | |
c53421b1 | 108 | unsigned long flags; |
1da177e4 LT |
109 | unsigned char val; |
110 | ||
111 | if (!capable(CAP_SYS_TIME)) | |
112 | return -EACCES; | |
113 | ||
114 | spin_lock_irqsave(&ds1286_lock, flags); | |
115 | val = rtc_read(RTC_CMD); | |
116 | val |= RTC_TDM; | |
117 | rtc_write(val, RTC_CMD); | |
118 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | case RTC_AIE_ON: /* Allow alarm interrupts. */ | |
123 | { | |
c53421b1 | 124 | unsigned long flags; |
1da177e4 LT |
125 | unsigned char val; |
126 | ||
127 | if (!capable(CAP_SYS_TIME)) | |
128 | return -EACCES; | |
129 | ||
130 | spin_lock_irqsave(&ds1286_lock, flags); | |
131 | val = rtc_read(RTC_CMD); | |
132 | val &= ~RTC_TDM; | |
133 | rtc_write(val, RTC_CMD); | |
134 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | case RTC_WIE_OFF: /* Mask watchdog int. enab. bit */ | |
139 | { | |
c53421b1 | 140 | unsigned long flags; |
1da177e4 LT |
141 | unsigned char val; |
142 | ||
143 | if (!capable(CAP_SYS_TIME)) | |
144 | return -EACCES; | |
145 | ||
146 | spin_lock_irqsave(&ds1286_lock, flags); | |
147 | val = rtc_read(RTC_CMD); | |
148 | val |= RTC_WAM; | |
149 | rtc_write(val, RTC_CMD); | |
150 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | case RTC_WIE_ON: /* Allow watchdog interrupts. */ | |
155 | { | |
c53421b1 | 156 | unsigned long flags; |
1da177e4 LT |
157 | unsigned char val; |
158 | ||
159 | if (!capable(CAP_SYS_TIME)) | |
160 | return -EACCES; | |
161 | ||
162 | spin_lock_irqsave(&ds1286_lock, flags); | |
163 | val = rtc_read(RTC_CMD); | |
164 | val &= ~RTC_WAM; | |
165 | rtc_write(val, RTC_CMD); | |
166 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | case RTC_ALM_READ: /* Read the present alarm time */ | |
171 | { | |
172 | /* | |
173 | * This returns a struct rtc_time. Reading >= 0xc0 | |
174 | * means "don't care" or "match all". Only the tm_hour, | |
175 | * tm_min, and tm_sec values are filled in. | |
176 | */ | |
177 | ||
178 | memset(&wtime, 0, sizeof(wtime)); | |
179 | ds1286_get_alm_time(&wtime); | |
180 | break; | |
181 | } | |
182 | case RTC_ALM_SET: /* Store a time into the alarm */ | |
183 | { | |
184 | /* | |
185 | * This expects a struct rtc_time. Writing 0xff means | |
186 | * "don't care" or "match all". Only the tm_hour, | |
187 | * tm_min and tm_sec are used. | |
188 | */ | |
189 | unsigned char hrs, min, sec; | |
190 | struct rtc_time alm_tm; | |
191 | ||
192 | if (!capable(CAP_SYS_TIME)) | |
193 | return -EACCES; | |
194 | ||
195 | if (copy_from_user(&alm_tm, (struct rtc_time*)arg, | |
196 | sizeof(struct rtc_time))) | |
197 | return -EFAULT; | |
198 | ||
199 | hrs = alm_tm.tm_hour; | |
200 | min = alm_tm.tm_min; | |
b35692eb | 201 | sec = alm_tm.tm_sec; |
1da177e4 LT |
202 | |
203 | if (hrs >= 24) | |
204 | hrs = 0xff; | |
205 | ||
206 | if (min >= 60) | |
207 | min = 0xff; | |
208 | ||
b35692eb RB |
209 | if (sec != 0) |
210 | return -EINVAL; | |
211 | ||
212 | min = BIN2BCD(min); | |
213 | min = BIN2BCD(hrs); | |
1da177e4 LT |
214 | |
215 | spin_lock(&ds1286_lock); | |
216 | rtc_write(hrs, RTC_HOURS_ALARM); | |
217 | rtc_write(min, RTC_MINUTES_ALARM); | |
218 | spin_unlock(&ds1286_lock); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
223 | { | |
224 | memset(&wtime, 0, sizeof(wtime)); | |
225 | ds1286_get_time(&wtime); | |
226 | break; | |
227 | } | |
228 | case RTC_SET_TIME: /* Set the RTC */ | |
229 | { | |
230 | struct rtc_time rtc_tm; | |
231 | ||
232 | if (!capable(CAP_SYS_TIME)) | |
233 | return -EACCES; | |
234 | ||
235 | if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, | |
236 | sizeof(struct rtc_time))) | |
237 | return -EFAULT; | |
238 | ||
239 | return ds1286_set_time(&rtc_tm); | |
240 | } | |
241 | default: | |
242 | return -EINVAL; | |
243 | } | |
244 | return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; | |
245 | } | |
246 | ||
247 | /* | |
248 | * We enforce only one user at a time here with the open/close. | |
249 | * Also clear the previous interrupt data on an open, and clean | |
250 | * up things on a close. | |
251 | */ | |
252 | ||
253 | static int ds1286_open(struct inode *inode, struct file *file) | |
254 | { | |
255 | spin_lock_irq(&ds1286_lock); | |
256 | ||
257 | if (ds1286_status & RTC_IS_OPEN) | |
258 | goto out_busy; | |
259 | ||
260 | ds1286_status |= RTC_IS_OPEN; | |
261 | ||
262 | spin_unlock_irq(&ds1286_lock); | |
263 | return 0; | |
264 | ||
265 | out_busy: | |
266 | spin_lock_irq(&ds1286_lock); | |
267 | return -EBUSY; | |
268 | } | |
269 | ||
270 | static int ds1286_release(struct inode *inode, struct file *file) | |
271 | { | |
272 | ds1286_status &= ~RTC_IS_OPEN; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static unsigned int ds1286_poll(struct file *file, poll_table *wait) | |
278 | { | |
279 | poll_wait(file, &ds1286_wait, wait); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
285 | * The various file operations we support. | |
286 | */ | |
287 | ||
62322d25 | 288 | static const struct file_operations ds1286_fops = { |
1da177e4 LT |
289 | .llseek = no_llseek, |
290 | .read = ds1286_read, | |
291 | .poll = ds1286_poll, | |
292 | .ioctl = ds1286_ioctl, | |
293 | .open = ds1286_open, | |
294 | .release = ds1286_release, | |
295 | }; | |
296 | ||
297 | static struct miscdevice ds1286_dev= | |
298 | { | |
299 | .minor = RTC_MINOR, | |
300 | .name = "rtc", | |
301 | .fops = &ds1286_fops, | |
302 | }; | |
303 | ||
304 | static int __init ds1286_init(void) | |
305 | { | |
306 | int err; | |
307 | ||
308 | printk(KERN_INFO "DS1286 Real Time Clock Driver v%s\n", DS1286_VERSION); | |
309 | ||
310 | err = misc_register(&ds1286_dev); | |
311 | if (err) | |
312 | goto out; | |
313 | ||
314 | if (!create_proc_read_entry("driver/rtc", 0, 0, ds1286_read_proc, NULL)) { | |
315 | err = -ENOMEM; | |
316 | ||
317 | goto out_deregister; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | ||
322 | out_deregister: | |
323 | misc_deregister(&ds1286_dev); | |
324 | ||
325 | out: | |
326 | return err; | |
327 | } | |
328 | ||
329 | static void __exit ds1286_exit(void) | |
330 | { | |
331 | remove_proc_entry("driver/rtc", NULL); | |
332 | misc_deregister(&ds1286_dev); | |
333 | } | |
334 | ||
335 | static char *days[] = { | |
336 | "***", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" | |
337 | }; | |
338 | ||
339 | /* | |
340 | * Info exported via "/proc/rtc". | |
341 | */ | |
342 | static int ds1286_proc_output(char *buf) | |
343 | { | |
344 | char *p, *s; | |
345 | struct rtc_time tm; | |
346 | unsigned char hundredth, month, cmd, amode; | |
347 | ||
348 | p = buf; | |
349 | ||
350 | ds1286_get_time(&tm); | |
351 | hundredth = rtc_read(RTC_HUNDREDTH_SECOND); | |
352 | BCD_TO_BIN(hundredth); | |
353 | ||
354 | p += sprintf(p, | |
355 | "rtc_time\t: %02d:%02d:%02d.%02d\n" | |
356 | "rtc_date\t: %04d-%02d-%02d\n", | |
357 | tm.tm_hour, tm.tm_min, tm.tm_sec, hundredth, | |
358 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); | |
359 | ||
360 | /* | |
361 | * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will | |
362 | * match any value for that particular field. Values that are | |
363 | * greater than a valid time, but less than 0xc0 shouldn't appear. | |
364 | */ | |
365 | ds1286_get_alm_time(&tm); | |
366 | p += sprintf(p, "alarm\t\t: %s ", days[tm.tm_wday]); | |
367 | if (tm.tm_hour <= 24) | |
368 | p += sprintf(p, "%02d:", tm.tm_hour); | |
369 | else | |
370 | p += sprintf(p, "**:"); | |
371 | ||
372 | if (tm.tm_min <= 59) | |
373 | p += sprintf(p, "%02d\n", tm.tm_min); | |
374 | else | |
375 | p += sprintf(p, "**\n"); | |
376 | ||
377 | month = rtc_read(RTC_MONTH); | |
378 | p += sprintf(p, | |
379 | "oscillator\t: %s\n" | |
380 | "square_wave\t: %s\n", | |
381 | (month & RTC_EOSC) ? "disabled" : "enabled", | |
382 | (month & RTC_ESQW) ? "disabled" : "enabled"); | |
383 | ||
384 | amode = ((rtc_read(RTC_MINUTES_ALARM) & 0x80) >> 5) | | |
385 | ((rtc_read(RTC_HOURS_ALARM) & 0x80) >> 6) | | |
386 | ((rtc_read(RTC_DAY_ALARM) & 0x80) >> 7); | |
387 | if (amode == 7) s = "each minute"; | |
388 | else if (amode == 3) s = "minutes match"; | |
389 | else if (amode == 1) s = "hours and minutes match"; | |
390 | else if (amode == 0) s = "days, hours and minutes match"; | |
391 | else s = "invalid"; | |
392 | p += sprintf(p, "alarm_mode\t: %s\n", s); | |
393 | ||
394 | cmd = rtc_read(RTC_CMD); | |
395 | p += sprintf(p, | |
396 | "alarm_enable\t: %s\n" | |
397 | "wdog_alarm\t: %s\n" | |
398 | "alarm_mask\t: %s\n" | |
399 | "wdog_alarm_mask\t: %s\n" | |
400 | "interrupt_mode\t: %s\n" | |
401 | "INTB_mode\t: %s_active\n" | |
402 | "interrupt_pins\t: %s\n", | |
403 | (cmd & RTC_TDF) ? "yes" : "no", | |
404 | (cmd & RTC_WAF) ? "yes" : "no", | |
405 | (cmd & RTC_TDM) ? "disabled" : "enabled", | |
406 | (cmd & RTC_WAM) ? "disabled" : "enabled", | |
407 | (cmd & RTC_PU_LVL) ? "pulse" : "level", | |
408 | (cmd & RTC_IBH_LO) ? "low" : "high", | |
409 | (cmd & RTC_IPSW) ? "unswapped" : "swapped"); | |
410 | ||
411 | return p - buf; | |
412 | } | |
413 | ||
414 | static int ds1286_read_proc(char *page, char **start, off_t off, | |
415 | int count, int *eof, void *data) | |
416 | { | |
417 | int len = ds1286_proc_output (page); | |
418 | if (len <= off+count) *eof = 1; | |
419 | *start = page + off; | |
420 | len -= off; | |
421 | if (len>count) | |
422 | len = count; | |
423 | if (len<0) | |
424 | len = 0; | |
425 | ||
426 | return len; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Returns true if a clock update is in progress | |
431 | */ | |
432 | static inline unsigned char ds1286_is_updating(void) | |
433 | { | |
434 | return rtc_read(RTC_CMD) & RTC_TE; | |
435 | } | |
436 | ||
437 | ||
438 | static void ds1286_get_time(struct rtc_time *rtc_tm) | |
439 | { | |
440 | unsigned char save_control; | |
c53421b1 | 441 | unsigned long flags; |
1da177e4 LT |
442 | unsigned long uip_watchdog = jiffies; |
443 | ||
444 | /* | |
445 | * read RTC once any update in progress is done. The update | |
446 | * can take just over 2ms. We wait 10 to 20ms. There is no need to | |
447 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. | |
448 | * If you need to know *exactly* when a second has started, enable | |
449 | * periodic update complete interrupts, (via ioctl) and then | |
450 | * immediately read /dev/rtc which will block until you get the IRQ. | |
451 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
452 | */ | |
453 | ||
454 | if (ds1286_is_updating() != 0) | |
ac0e4b7d | 455 | while (time_before(jiffies, uip_watchdog + 2*HZ/100)) |
1da177e4 LT |
456 | barrier(); |
457 | ||
458 | /* | |
459 | * Only the values that we read from the RTC are set. We leave | |
460 | * tm_wday, tm_yday and tm_isdst untouched. Even though the | |
461 | * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated | |
462 | * by the RTC when initially set to a non-zero value. | |
463 | */ | |
464 | spin_lock_irqsave(&ds1286_lock, flags); | |
465 | save_control = rtc_read(RTC_CMD); | |
466 | rtc_write((save_control|RTC_TE), RTC_CMD); | |
467 | ||
468 | rtc_tm->tm_sec = rtc_read(RTC_SECONDS); | |
469 | rtc_tm->tm_min = rtc_read(RTC_MINUTES); | |
470 | rtc_tm->tm_hour = rtc_read(RTC_HOURS) & 0x3f; | |
471 | rtc_tm->tm_mday = rtc_read(RTC_DATE); | |
472 | rtc_tm->tm_mon = rtc_read(RTC_MONTH) & 0x1f; | |
473 | rtc_tm->tm_year = rtc_read(RTC_YEAR); | |
474 | ||
475 | rtc_write(save_control, RTC_CMD); | |
476 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
477 | ||
478 | BCD_TO_BIN(rtc_tm->tm_sec); | |
479 | BCD_TO_BIN(rtc_tm->tm_min); | |
480 | BCD_TO_BIN(rtc_tm->tm_hour); | |
481 | BCD_TO_BIN(rtc_tm->tm_mday); | |
482 | BCD_TO_BIN(rtc_tm->tm_mon); | |
483 | BCD_TO_BIN(rtc_tm->tm_year); | |
484 | ||
485 | /* | |
486 | * Account for differences between how the RTC uses the values | |
487 | * and how they are defined in a struct rtc_time; | |
488 | */ | |
489 | if (rtc_tm->tm_year < 45) | |
490 | rtc_tm->tm_year += 30; | |
491 | if ((rtc_tm->tm_year += 40) < 70) | |
492 | rtc_tm->tm_year += 100; | |
493 | ||
494 | rtc_tm->tm_mon--; | |
495 | } | |
496 | ||
497 | static int ds1286_set_time(struct rtc_time *rtc_tm) | |
498 | { | |
499 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
500 | unsigned char save_control; | |
c53421b1 AD |
501 | unsigned int yrs; |
502 | unsigned long flags; | |
1da177e4 LT |
503 | |
504 | ||
505 | yrs = rtc_tm->tm_year + 1900; | |
506 | mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */ | |
507 | day = rtc_tm->tm_mday; | |
508 | hrs = rtc_tm->tm_hour; | |
509 | min = rtc_tm->tm_min; | |
510 | sec = rtc_tm->tm_sec; | |
511 | ||
512 | if (yrs < 1970) | |
513 | return -EINVAL; | |
514 | ||
515 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
516 | ||
517 | if ((mon > 12) || (day == 0)) | |
518 | return -EINVAL; | |
519 | ||
520 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
521 | return -EINVAL; | |
522 | ||
523 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
524 | return -EINVAL; | |
525 | ||
526 | if ((yrs -= 1940) > 255) /* They are unsigned */ | |
527 | return -EINVAL; | |
528 | ||
529 | if (yrs >= 100) | |
530 | yrs -= 100; | |
531 | ||
532 | BIN_TO_BCD(sec); | |
533 | BIN_TO_BCD(min); | |
534 | BIN_TO_BCD(hrs); | |
535 | BIN_TO_BCD(day); | |
536 | BIN_TO_BCD(mon); | |
537 | BIN_TO_BCD(yrs); | |
538 | ||
539 | spin_lock_irqsave(&ds1286_lock, flags); | |
540 | save_control = rtc_read(RTC_CMD); | |
541 | rtc_write((save_control|RTC_TE), RTC_CMD); | |
542 | ||
543 | rtc_write(yrs, RTC_YEAR); | |
544 | rtc_write(mon, RTC_MONTH); | |
545 | rtc_write(day, RTC_DATE); | |
546 | rtc_write(hrs, RTC_HOURS); | |
547 | rtc_write(min, RTC_MINUTES); | |
548 | rtc_write(sec, RTC_SECONDS); | |
549 | rtc_write(0, RTC_HUNDREDTH_SECOND); | |
550 | ||
551 | rtc_write(save_control, RTC_CMD); | |
552 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static void ds1286_get_alm_time(struct rtc_time *alm_tm) | |
558 | { | |
559 | unsigned char cmd; | |
c53421b1 | 560 | unsigned long flags; |
1da177e4 LT |
561 | |
562 | /* | |
563 | * Only the values that we read from the RTC are set. That | |
564 | * means only tm_wday, tm_hour, tm_min. | |
565 | */ | |
566 | spin_lock_irqsave(&ds1286_lock, flags); | |
567 | alm_tm->tm_min = rtc_read(RTC_MINUTES_ALARM) & 0x7f; | |
568 | alm_tm->tm_hour = rtc_read(RTC_HOURS_ALARM) & 0x1f; | |
569 | alm_tm->tm_wday = rtc_read(RTC_DAY_ALARM) & 0x07; | |
570 | cmd = rtc_read(RTC_CMD); | |
571 | spin_unlock_irqrestore(&ds1286_lock, flags); | |
572 | ||
573 | BCD_TO_BIN(alm_tm->tm_min); | |
574 | BCD_TO_BIN(alm_tm->tm_hour); | |
575 | alm_tm->tm_sec = 0; | |
576 | } | |
577 | ||
578 | module_init(ds1286_init); | |
579 | module_exit(ds1286_exit); | |
580 | ||
581 | MODULE_AUTHOR("Ralf Baechle"); | |
582 | MODULE_LICENSE("GPL"); | |
583 | MODULE_ALIAS_MISCDEV(RTC_MINOR); |