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7be2c7c9 DB |
1 | /* |
2 | * RTC class driver for "CMOS RTC": PCs, ACPI, etc | |
3 | * | |
4 | * Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c) | |
5 | * Copyright (C) 2006 David Brownell (convert to new framework) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | /* | |
14 | * The original "cmos clock" chip was an MC146818 chip, now obsolete. | |
15 | * That defined the register interface now provided by all PCs, some | |
16 | * non-PC systems, and incorporated into ACPI. Modern PC chipsets | |
17 | * integrate an MC146818 clone in their southbridge, and boards use | |
18 | * that instead of discrete clones like the DS12887 or M48T86. There | |
19 | * are also clones that connect using the LPC bus. | |
20 | * | |
21 | * That register API is also used directly by various other drivers | |
22 | * (notably for integrated NVRAM), infrastructure (x86 has code to | |
23 | * bypass the RTC framework, directly reading the RTC during boot | |
24 | * and updating minutes/seconds for systems using NTP synch) and | |
25 | * utilities (like userspace 'hwclock', if no /dev node exists). | |
26 | * | |
27 | * So **ALL** calls to CMOS_READ and CMOS_WRITE must be done with | |
28 | * interrupts disabled, holding the global rtc_lock, to exclude those | |
29 | * other drivers and utilities on correctly configured systems. | |
30 | */ | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/mod_devicetable.h> | |
38 | ||
39 | /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ | |
40 | #include <asm-generic/rtc.h> | |
41 | ||
42 | ||
43 | struct cmos_rtc { | |
44 | struct rtc_device *rtc; | |
45 | struct device *dev; | |
46 | int irq; | |
47 | struct resource *iomem; | |
48 | ||
49 | u8 suspend_ctrl; | |
50 | ||
51 | /* newer hardware extends the original register set */ | |
52 | u8 day_alrm; | |
53 | u8 mon_alrm; | |
54 | u8 century; | |
55 | }; | |
56 | ||
57 | /* both platform and pnp busses use negative numbers for invalid irqs */ | |
58 | #define is_valid_irq(n) ((n) >= 0) | |
59 | ||
60 | static const char driver_name[] = "rtc_cmos"; | |
61 | ||
62 | /*----------------------------------------------------------------*/ | |
63 | ||
64 | static int cmos_read_time(struct device *dev, struct rtc_time *t) | |
65 | { | |
66 | /* REVISIT: if the clock has a "century" register, use | |
67 | * that instead of the heuristic in get_rtc_time(). | |
68 | * That'll make Y3K compatility (year > 2070) easy! | |
69 | */ | |
70 | get_rtc_time(t); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int cmos_set_time(struct device *dev, struct rtc_time *t) | |
75 | { | |
76 | /* REVISIT: set the "century" register if available | |
77 | * | |
78 | * NOTE: this ignores the issue whereby updating the seconds | |
79 | * takes effect exactly 500ms after we write the register. | |
80 | * (Also queueing and other delays before we get this far.) | |
81 | */ | |
82 | return set_rtc_time(t); | |
83 | } | |
84 | ||
85 | static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
86 | { | |
87 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
88 | unsigned char rtc_control; | |
89 | ||
90 | if (!is_valid_irq(cmos->irq)) | |
91 | return -EIO; | |
92 | ||
93 | /* Basic alarms only support hour, minute, and seconds fields. | |
94 | * Some also support day and month, for alarms up to a year in | |
95 | * the future. | |
96 | */ | |
97 | t->time.tm_mday = -1; | |
98 | t->time.tm_mon = -1; | |
99 | ||
100 | spin_lock_irq(&rtc_lock); | |
101 | t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM); | |
102 | t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM); | |
103 | t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM); | |
104 | ||
105 | if (cmos->day_alrm) { | |
106 | t->time.tm_mday = CMOS_READ(cmos->day_alrm); | |
107 | if (!t->time.tm_mday) | |
108 | t->time.tm_mday = -1; | |
109 | ||
110 | if (cmos->mon_alrm) { | |
111 | t->time.tm_mon = CMOS_READ(cmos->mon_alrm); | |
112 | if (!t->time.tm_mon) | |
113 | t->time.tm_mon = -1; | |
114 | } | |
115 | } | |
116 | ||
117 | rtc_control = CMOS_READ(RTC_CONTROL); | |
118 | spin_unlock_irq(&rtc_lock); | |
119 | ||
120 | /* REVISIT this assumes PC style usage: always BCD */ | |
121 | ||
122 | if (((unsigned)t->time.tm_sec) < 0x60) | |
123 | t->time.tm_sec = BCD2BIN(t->time.tm_sec); | |
124 | else | |
125 | t->time.tm_sec = -1; | |
126 | if (((unsigned)t->time.tm_min) < 0x60) | |
127 | t->time.tm_min = BCD2BIN(t->time.tm_min); | |
128 | else | |
129 | t->time.tm_min = -1; | |
130 | if (((unsigned)t->time.tm_hour) < 0x24) | |
131 | t->time.tm_hour = BCD2BIN(t->time.tm_hour); | |
132 | else | |
133 | t->time.tm_hour = -1; | |
134 | ||
135 | if (cmos->day_alrm) { | |
136 | if (((unsigned)t->time.tm_mday) <= 0x31) | |
137 | t->time.tm_mday = BCD2BIN(t->time.tm_mday); | |
138 | else | |
139 | t->time.tm_mday = -1; | |
140 | if (cmos->mon_alrm) { | |
141 | if (((unsigned)t->time.tm_mon) <= 0x12) | |
142 | t->time.tm_mon = BCD2BIN(t->time.tm_mon) - 1; | |
143 | else | |
144 | t->time.tm_mon = -1; | |
145 | } | |
146 | } | |
147 | t->time.tm_year = -1; | |
148 | ||
149 | t->enabled = !!(rtc_control & RTC_AIE); | |
150 | t->pending = 0; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
156 | { | |
157 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
158 | unsigned char mon, mday, hrs, min, sec; | |
159 | unsigned char rtc_control, rtc_intr; | |
160 | ||
161 | if (!is_valid_irq(cmos->irq)) | |
162 | return -EIO; | |
163 | ||
164 | /* REVISIT this assumes PC style usage: always BCD */ | |
165 | ||
166 | /* Writing 0xff means "don't care" or "match all". */ | |
167 | ||
168 | mon = t->time.tm_mon; | |
169 | mon = (mon < 12) ? BIN2BCD(mon) : 0xff; | |
170 | mon++; | |
171 | ||
172 | mday = t->time.tm_mday; | |
173 | mday = (mday >= 1 && mday <= 31) ? BIN2BCD(mday) : 0xff; | |
174 | ||
175 | hrs = t->time.tm_hour; | |
176 | hrs = (hrs < 24) ? BIN2BCD(hrs) : 0xff; | |
177 | ||
178 | min = t->time.tm_min; | |
179 | min = (min < 60) ? BIN2BCD(min) : 0xff; | |
180 | ||
181 | sec = t->time.tm_sec; | |
182 | sec = (sec < 60) ? BIN2BCD(sec) : 0xff; | |
183 | ||
184 | spin_lock_irq(&rtc_lock); | |
185 | ||
186 | /* next rtc irq must not be from previous alarm setting */ | |
187 | rtc_control = CMOS_READ(RTC_CONTROL); | |
188 | rtc_control &= ~RTC_AIE; | |
189 | CMOS_WRITE(rtc_control, RTC_CONTROL); | |
190 | rtc_intr = CMOS_READ(RTC_INTR_FLAGS); | |
191 | if (rtc_intr) | |
192 | rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr); | |
193 | ||
194 | /* update alarm */ | |
195 | CMOS_WRITE(hrs, RTC_HOURS_ALARM); | |
196 | CMOS_WRITE(min, RTC_MINUTES_ALARM); | |
197 | CMOS_WRITE(sec, RTC_SECONDS_ALARM); | |
198 | ||
199 | /* the system may support an "enhanced" alarm */ | |
200 | if (cmos->day_alrm) { | |
201 | CMOS_WRITE(mday, cmos->day_alrm); | |
202 | if (cmos->mon_alrm) | |
203 | CMOS_WRITE(mon, cmos->mon_alrm); | |
204 | } | |
205 | ||
206 | if (t->enabled) { | |
207 | rtc_control |= RTC_AIE; | |
208 | CMOS_WRITE(rtc_control, RTC_CONTROL); | |
209 | rtc_intr = CMOS_READ(RTC_INTR_FLAGS); | |
210 | if (rtc_intr) | |
211 | rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr); | |
212 | } | |
213 | ||
214 | spin_unlock_irq(&rtc_lock); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static int cmos_set_freq(struct device *dev, int freq) | |
220 | { | |
221 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
222 | int f; | |
223 | unsigned long flags; | |
224 | ||
225 | if (!is_valid_irq(cmos->irq)) | |
226 | return -ENXIO; | |
227 | ||
228 | /* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */ | |
229 | f = ffs(freq); | |
230 | if (f != 0) { | |
231 | if (f-- > 16 || freq != (1 << f)) | |
232 | return -EINVAL; | |
233 | f = 16 - f; | |
234 | } | |
235 | ||
236 | spin_lock_irqsave(&rtc_lock, flags); | |
237 | CMOS_WRITE(RTC_REF_CLCK_32KHZ | f, RTC_FREQ_SELECT); | |
238 | spin_unlock_irqrestore(&rtc_lock, flags); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) | |
244 | ||
245 | static int | |
246 | cmos_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
247 | { | |
248 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
249 | unsigned char rtc_control, rtc_intr; | |
250 | unsigned long flags; | |
251 | ||
252 | switch (cmd) { | |
253 | case RTC_AIE_OFF: | |
254 | case RTC_AIE_ON: | |
255 | case RTC_UIE_OFF: | |
256 | case RTC_UIE_ON: | |
257 | case RTC_PIE_OFF: | |
258 | case RTC_PIE_ON: | |
259 | if (!is_valid_irq(cmos->irq)) | |
260 | return -EINVAL; | |
261 | break; | |
262 | default: | |
263 | return -ENOIOCTLCMD; | |
264 | } | |
265 | ||
266 | spin_lock_irqsave(&rtc_lock, flags); | |
267 | rtc_control = CMOS_READ(RTC_CONTROL); | |
268 | switch (cmd) { | |
269 | case RTC_AIE_OFF: /* alarm off */ | |
270 | rtc_control &= ~RTC_AIE; | |
271 | break; | |
272 | case RTC_AIE_ON: /* alarm on */ | |
273 | rtc_control |= RTC_AIE; | |
274 | break; | |
275 | case RTC_UIE_OFF: /* update off */ | |
276 | rtc_control &= ~RTC_UIE; | |
277 | break; | |
278 | case RTC_UIE_ON: /* update on */ | |
279 | rtc_control |= RTC_UIE; | |
280 | break; | |
281 | case RTC_PIE_OFF: /* periodic off */ | |
282 | rtc_control &= ~RTC_PIE; | |
283 | break; | |
284 | case RTC_PIE_ON: /* periodic on */ | |
285 | rtc_control |= RTC_PIE; | |
286 | break; | |
287 | } | |
288 | CMOS_WRITE(rtc_control, RTC_CONTROL); | |
289 | rtc_intr = CMOS_READ(RTC_INTR_FLAGS); | |
290 | if (rtc_intr) | |
291 | rtc_update_irq(&cmos->rtc->class_dev, 1, rtc_intr); | |
292 | spin_unlock_irqrestore(&rtc_lock, flags); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | #else | |
297 | #define cmos_rtc_ioctl NULL | |
298 | #endif | |
299 | ||
300 | #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) | |
301 | ||
302 | static int cmos_procfs(struct device *dev, struct seq_file *seq) | |
303 | { | |
304 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
305 | unsigned char rtc_control, valid; | |
306 | ||
307 | spin_lock_irq(&rtc_lock); | |
308 | rtc_control = CMOS_READ(RTC_CONTROL); | |
309 | valid = CMOS_READ(RTC_VALID); | |
310 | spin_unlock_irq(&rtc_lock); | |
311 | ||
312 | /* NOTE: at least ICH6 reports battery status using a different | |
313 | * (non-RTC) bit; and SQWE is ignored on many current systems. | |
314 | */ | |
315 | return seq_printf(seq, | |
316 | "periodic_IRQ\t: %s\n" | |
317 | "update_IRQ\t: %s\n" | |
318 | // "square_wave\t: %s\n" | |
319 | // "BCD\t\t: %s\n" | |
320 | "DST_enable\t: %s\n" | |
321 | "periodic_freq\t: %d\n" | |
322 | "batt_status\t: %s\n", | |
323 | (rtc_control & RTC_PIE) ? "yes" : "no", | |
324 | (rtc_control & RTC_UIE) ? "yes" : "no", | |
325 | // (rtc_control & RTC_SQWE) ? "yes" : "no", | |
326 | // (rtc_control & RTC_DM_BINARY) ? "no" : "yes", | |
327 | (rtc_control & RTC_DST_EN) ? "yes" : "no", | |
328 | cmos->rtc->irq_freq, | |
329 | (valid & RTC_VRT) ? "okay" : "dead"); | |
330 | } | |
331 | ||
332 | #else | |
333 | #define cmos_procfs NULL | |
334 | #endif | |
335 | ||
336 | static const struct rtc_class_ops cmos_rtc_ops = { | |
337 | .ioctl = cmos_rtc_ioctl, | |
338 | .read_time = cmos_read_time, | |
339 | .set_time = cmos_set_time, | |
340 | .read_alarm = cmos_read_alarm, | |
341 | .set_alarm = cmos_set_alarm, | |
342 | .proc = cmos_procfs, | |
343 | .irq_set_freq = cmos_set_freq, | |
344 | }; | |
345 | ||
346 | /*----------------------------------------------------------------*/ | |
347 | ||
348 | static struct cmos_rtc cmos_rtc; | |
349 | ||
350 | static irqreturn_t cmos_interrupt(int irq, void *p) | |
351 | { | |
352 | u8 irqstat; | |
353 | ||
354 | spin_lock(&rtc_lock); | |
355 | irqstat = CMOS_READ(RTC_INTR_FLAGS); | |
356 | spin_unlock(&rtc_lock); | |
357 | ||
358 | if (irqstat) { | |
359 | /* NOTE: irqstat may have e.g. RTC_PF set | |
360 | * even when RTC_PIE is clear... | |
361 | */ | |
362 | rtc_update_irq(p, 1, irqstat); | |
363 | return IRQ_HANDLED; | |
364 | } else | |
365 | return IRQ_NONE; | |
366 | } | |
367 | ||
368 | #ifdef CONFIG_PNPACPI | |
369 | #define is_pnpacpi() 1 | |
370 | #define INITSECTION | |
371 | ||
372 | #else | |
373 | #define is_pnpacpi() 0 | |
374 | #define INITSECTION __init | |
375 | #endif | |
376 | ||
377 | static int INITSECTION | |
378 | cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) | |
379 | { | |
380 | struct cmos_rtc_board_info *info = dev->platform_data; | |
381 | int retval = 0; | |
382 | unsigned char rtc_control; | |
383 | ||
384 | /* there can be only one ... */ | |
385 | if (cmos_rtc.dev) | |
386 | return -EBUSY; | |
387 | ||
388 | if (!ports) | |
389 | return -ENODEV; | |
390 | ||
391 | cmos_rtc.irq = rtc_irq; | |
392 | cmos_rtc.iomem = ports; | |
393 | ||
394 | /* For ACPI systems the info comes from the FADT. On others, | |
395 | * board specific setup provides it as appropriate. | |
396 | */ | |
397 | if (info) { | |
398 | cmos_rtc.day_alrm = info->rtc_day_alarm; | |
399 | cmos_rtc.mon_alrm = info->rtc_mon_alarm; | |
400 | cmos_rtc.century = info->rtc_century; | |
401 | } | |
402 | ||
403 | cmos_rtc.rtc = rtc_device_register(driver_name, dev, | |
404 | &cmos_rtc_ops, THIS_MODULE); | |
405 | if (IS_ERR(cmos_rtc.rtc)) | |
406 | return PTR_ERR(cmos_rtc.rtc); | |
407 | ||
408 | cmos_rtc.dev = dev; | |
409 | dev_set_drvdata(dev, &cmos_rtc); | |
410 | ||
411 | /* platform and pnp busses handle resources incompatibly. | |
412 | * | |
413 | * REVISIT for non-x86 systems we may need to handle io memory | |
414 | * resources: ioremap them, and request_mem_region(). | |
415 | */ | |
416 | if (is_pnpacpi()) { | |
417 | retval = request_resource(&ioport_resource, ports); | |
418 | if (retval < 0) { | |
419 | dev_dbg(dev, "i/o registers already in use\n"); | |
420 | goto cleanup0; | |
421 | } | |
422 | } | |
423 | rename_region(ports, cmos_rtc.rtc->class_dev.class_id); | |
424 | ||
425 | spin_lock_irq(&rtc_lock); | |
426 | ||
427 | /* force periodic irq to CMOS reset default of 1024Hz; | |
428 | * | |
429 | * REVISIT it's been reported that at least one x86_64 ALI mobo | |
430 | * doesn't use 32KHz here ... for portability we might need to | |
431 | * do something about other clock frequencies. | |
432 | */ | |
433 | CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT); | |
434 | cmos_rtc.rtc->irq_freq = 1024; | |
435 | ||
436 | /* disable irqs. | |
437 | * | |
438 | * NOTE after changing RTC_xIE bits we always read INTR_FLAGS; | |
439 | * allegedly some older rtcs need that to handle irqs properly | |
440 | */ | |
441 | rtc_control = CMOS_READ(RTC_CONTROL); | |
442 | rtc_control &= ~(RTC_PIE | RTC_AIE | RTC_UIE); | |
443 | CMOS_WRITE(rtc_control, RTC_CONTROL); | |
444 | CMOS_READ(RTC_INTR_FLAGS); | |
445 | ||
446 | spin_unlock_irq(&rtc_lock); | |
447 | ||
448 | /* FIXME teach the alarm code how to handle binary mode; | |
449 | * <asm-generic/rtc.h> doesn't know 12-hour mode either. | |
450 | */ | |
451 | if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) { | |
452 | dev_dbg(dev, "only 24-hr BCD mode supported\n"); | |
453 | retval = -ENXIO; | |
454 | goto cleanup1; | |
455 | } | |
456 | ||
457 | if (is_valid_irq(rtc_irq)) | |
458 | retval = request_irq(rtc_irq, cmos_interrupt, IRQF_DISABLED, | |
459 | cmos_rtc.rtc->class_dev.class_id, | |
460 | &cmos_rtc.rtc->class_dev); | |
461 | if (retval < 0) { | |
462 | dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq); | |
463 | goto cleanup1; | |
464 | } | |
465 | ||
466 | /* REVISIT optionally make 50 or 114 bytes NVRAM available, | |
467 | * like rtc-ds1553, rtc-ds1742 ... this will often include | |
468 | * registers for century, and day/month alarm. | |
469 | */ | |
470 | ||
471 | pr_info("%s: alarms up to one %s%s\n", | |
472 | cmos_rtc.rtc->class_dev.class_id, | |
473 | is_valid_irq(rtc_irq) | |
474 | ? (cmos_rtc.mon_alrm | |
475 | ? "year" | |
476 | : (cmos_rtc.day_alrm | |
477 | ? "month" : "day")) | |
478 | : "no", | |
479 | cmos_rtc.century ? ", y3k" : "" | |
480 | ); | |
481 | ||
482 | return 0; | |
483 | ||
484 | cleanup1: | |
485 | rename_region(ports, NULL); | |
486 | cleanup0: | |
487 | rtc_device_unregister(cmos_rtc.rtc); | |
488 | return retval; | |
489 | } | |
490 | ||
491 | static void cmos_do_shutdown(void) | |
492 | { | |
493 | unsigned char rtc_control; | |
494 | ||
495 | spin_lock_irq(&rtc_lock); | |
496 | rtc_control = CMOS_READ(RTC_CONTROL); | |
497 | rtc_control &= ~(RTC_PIE|RTC_AIE|RTC_UIE); | |
498 | CMOS_WRITE(rtc_control, RTC_CONTROL); | |
499 | CMOS_READ(RTC_INTR_FLAGS); | |
500 | spin_unlock_irq(&rtc_lock); | |
501 | } | |
502 | ||
503 | static void __exit cmos_do_remove(struct device *dev) | |
504 | { | |
505 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
506 | ||
507 | cmos_do_shutdown(); | |
508 | ||
509 | if (is_pnpacpi()) | |
510 | release_resource(cmos->iomem); | |
511 | rename_region(cmos->iomem, NULL); | |
512 | ||
513 | if (is_valid_irq(cmos->irq)) | |
514 | free_irq(cmos->irq, &cmos_rtc.rtc->class_dev); | |
515 | ||
516 | rtc_device_unregister(cmos_rtc.rtc); | |
517 | ||
518 | cmos_rtc.dev = NULL; | |
519 | dev_set_drvdata(dev, NULL); | |
520 | } | |
521 | ||
522 | #ifdef CONFIG_PM | |
523 | ||
524 | static int cmos_suspend(struct device *dev, pm_message_t mesg) | |
525 | { | |
526 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
527 | int do_wake = device_may_wakeup(dev); | |
528 | unsigned char tmp, irqstat; | |
529 | ||
530 | /* only the alarm might be a wakeup event source */ | |
531 | spin_lock_irq(&rtc_lock); | |
532 | cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL); | |
533 | if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) { | |
534 | if (do_wake) | |
535 | tmp &= ~(RTC_PIE|RTC_UIE); | |
536 | else | |
537 | tmp &= ~(RTC_PIE|RTC_AIE|RTC_UIE); | |
538 | CMOS_WRITE(tmp, RTC_CONTROL); | |
539 | irqstat = CMOS_READ(RTC_INTR_FLAGS); | |
540 | } else | |
541 | irqstat = 0; | |
542 | spin_unlock_irq(&rtc_lock); | |
543 | ||
544 | if (irqstat) | |
545 | rtc_update_irq(&cmos->rtc->class_dev, 1, irqstat); | |
546 | ||
547 | /* ACPI HOOK: enable ACPI_EVENT_RTC when (tmp & RTC_AIE) | |
548 | * ... it'd be best if we could do that under rtc_lock. | |
549 | */ | |
550 | ||
551 | pr_debug("%s: suspend%s, ctrl %02x\n", | |
552 | cmos_rtc.rtc->class_dev.class_id, | |
553 | (tmp & RTC_AIE) ? ", alarm may wake" : "", | |
554 | tmp); | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | static int cmos_resume(struct device *dev) | |
560 | { | |
561 | struct cmos_rtc *cmos = dev_get_drvdata(dev); | |
562 | unsigned char tmp = cmos->suspend_ctrl; | |
563 | ||
564 | /* REVISIT: a mechanism to resync the system clock (jiffies) | |
565 | * on resume should be portable between platforms ... | |
566 | */ | |
567 | ||
568 | /* re-enable any irqs previously active */ | |
569 | if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) { | |
570 | ||
571 | /* ACPI HOOK: disable ACPI_EVENT_RTC when (tmp & RTC_AIE) */ | |
572 | ||
573 | spin_lock_irq(&rtc_lock); | |
574 | CMOS_WRITE(tmp, RTC_CONTROL); | |
575 | tmp = CMOS_READ(RTC_INTR_FLAGS); | |
576 | spin_unlock_irq(&rtc_lock); | |
577 | if (tmp) | |
578 | rtc_update_irq(&cmos->rtc->class_dev, 1, tmp); | |
579 | } | |
580 | ||
581 | pr_debug("%s: resume, ctrl %02x\n", | |
582 | cmos_rtc.rtc->class_dev.class_id, | |
583 | cmos->suspend_ctrl); | |
584 | ||
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | #else | |
590 | #define cmos_suspend NULL | |
591 | #define cmos_resume NULL | |
592 | #endif | |
593 | ||
594 | /*----------------------------------------------------------------*/ | |
595 | ||
596 | /* The "CMOS" RTC normally lives on the platform_bus. On ACPI systems, | |
597 | * the device node may alternatively be created as a PNP device. | |
598 | */ | |
599 | ||
600 | #ifdef CONFIG_PNPACPI | |
601 | ||
602 | #include <linux/pnp.h> | |
603 | ||
604 | static int __devinit | |
605 | cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) | |
606 | { | |
607 | /* REVISIT paranoia argues for a shutdown notifier, since PNP | |
608 | * drivers can't provide shutdown() methods to disable IRQs. | |
609 | * Or better yet, fix PNP to allow those methods... | |
610 | */ | |
611 | return cmos_do_probe(&pnp->dev, | |
612 | &pnp->res.port_resource[0], | |
613 | pnp->res.irq_resource[0].start); | |
614 | } | |
615 | ||
616 | static void __exit cmos_pnp_remove(struct pnp_dev *pnp) | |
617 | { | |
618 | cmos_do_remove(&pnp->dev); | |
619 | } | |
620 | ||
621 | #ifdef CONFIG_PM | |
622 | ||
623 | static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg) | |
624 | { | |
625 | return cmos_suspend(&pnp->dev, mesg); | |
626 | } | |
627 | ||
628 | static int cmos_pnp_resume(struct pnp_dev *pnp) | |
629 | { | |
630 | return cmos_resume(&pnp->dev); | |
631 | } | |
632 | ||
633 | #else | |
634 | #define cmos_pnp_suspend NULL | |
635 | #define cmos_pnp_resume NULL | |
636 | #endif | |
637 | ||
638 | ||
639 | static const struct pnp_device_id rtc_ids[] = { | |
640 | { .id = "PNP0b00", }, | |
641 | { .id = "PNP0b01", }, | |
642 | { .id = "PNP0b02", }, | |
643 | { }, | |
644 | }; | |
645 | MODULE_DEVICE_TABLE(pnp, rtc_ids); | |
646 | ||
647 | static struct pnp_driver cmos_pnp_driver = { | |
648 | .name = (char *) driver_name, | |
649 | .id_table = rtc_ids, | |
650 | .probe = cmos_pnp_probe, | |
651 | .remove = __exit_p(cmos_pnp_remove), | |
652 | ||
653 | /* flag ensures resume() gets called, and stops syslog spam */ | |
654 | .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, | |
655 | .suspend = cmos_pnp_suspend, | |
656 | .resume = cmos_pnp_resume, | |
657 | }; | |
658 | ||
659 | static int __init cmos_init(void) | |
660 | { | |
661 | return pnp_register_driver(&cmos_pnp_driver); | |
662 | } | |
663 | module_init(cmos_init); | |
664 | ||
665 | static void __exit cmos_exit(void) | |
666 | { | |
667 | pnp_unregister_driver(&cmos_pnp_driver); | |
668 | } | |
669 | module_exit(cmos_exit); | |
670 | ||
671 | #else /* no PNPACPI */ | |
672 | ||
673 | /*----------------------------------------------------------------*/ | |
674 | ||
675 | /* Platform setup should have set up an RTC device, when PNPACPI is | |
676 | * unavailable ... this is the normal case, common even on PCs. | |
677 | */ | |
678 | ||
679 | static int __init cmos_platform_probe(struct platform_device *pdev) | |
680 | { | |
681 | return cmos_do_probe(&pdev->dev, | |
682 | platform_get_resource(pdev, IORESOURCE_IO, 0), | |
683 | platform_get_irq(pdev, 0)); | |
684 | } | |
685 | ||
686 | static int __exit cmos_platform_remove(struct platform_device *pdev) | |
687 | { | |
688 | cmos_do_remove(&pdev->dev); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static void cmos_platform_shutdown(struct platform_device *pdev) | |
693 | { | |
694 | cmos_do_shutdown(); | |
695 | } | |
696 | ||
697 | static struct platform_driver cmos_platform_driver = { | |
698 | .remove = __exit_p(cmos_platform_remove), | |
699 | .shutdown = cmos_platform_shutdown, | |
700 | .driver = { | |
701 | .name = (char *) driver_name, | |
702 | .suspend = cmos_suspend, | |
703 | .resume = cmos_resume, | |
704 | } | |
705 | }; | |
706 | ||
707 | static int __init cmos_init(void) | |
708 | { | |
709 | return platform_driver_probe(&cmos_platform_driver, | |
710 | cmos_platform_probe); | |
711 | } | |
712 | module_init(cmos_init); | |
713 | ||
714 | static void __exit cmos_exit(void) | |
715 | { | |
716 | platform_driver_unregister(&cmos_platform_driver); | |
717 | } | |
718 | module_exit(cmos_exit); | |
719 | ||
720 | ||
721 | #endif /* !PNPACPI */ | |
722 | ||
723 | MODULE_AUTHOR("David Brownell"); | |
724 | MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs"); | |
725 | MODULE_LICENSE("GPL"); |