Fix /proc/acpi/alarm BCD alarm encodings
[sfrench/cifs-2.6.git] / drivers / acpi / sleep / proc.c
1 #include <linux/proc_fs.h>
2 #include <linux/seq_file.h>
3 #include <linux/suspend.h>
4 #include <linux/bcd.h>
5 #include <asm/uaccess.h>
6
7 #include <acpi/acpi_bus.h>
8 #include <acpi/acpi_drivers.h>
9
10 #ifdef CONFIG_X86
11 #include <linux/mc146818rtc.h>
12 #endif
13
14 #include "sleep.h"
15
16 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
17
18 /*
19  * this file provides support for:
20  * /proc/acpi/sleep
21  * /proc/acpi/alarm
22  * /proc/acpi/wakeup
23  */
24
25 ACPI_MODULE_NAME("sleep")
26 #ifdef  CONFIG_ACPI_PROCFS
27 static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
28 {
29         int i;
30
31         ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
32
33         for (i = 0; i <= ACPI_STATE_S5; i++) {
34                 if (sleep_states[i]) {
35                         seq_printf(seq, "S%d ", i);
36                 }
37         }
38
39         seq_puts(seq, "\n");
40
41         return 0;
42 }
43
44 static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
45 {
46         return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
47 }
48
49 static ssize_t
50 acpi_system_write_sleep(struct file *file,
51                         const char __user * buffer, size_t count, loff_t * ppos)
52 {
53         char str[12];
54         u32 state = 0;
55         int error = 0;
56
57         if (count > sizeof(str) - 1)
58                 goto Done;
59         memset(str, 0, sizeof(str));
60         if (copy_from_user(str, buffer, count))
61                 return -EFAULT;
62
63         /* Check for S4 bios request */
64         if (!strcmp(str, "4b")) {
65                 error = acpi_suspend(4);
66                 goto Done;
67         }
68         state = simple_strtoul(str, NULL, 0);
69 #ifdef CONFIG_HIBERNATION
70         if (state == 4) {
71                 error = hibernate();
72                 goto Done;
73         }
74 #endif
75         error = acpi_suspend(state);
76       Done:
77         return error ? error : count;
78 }
79 #endif                          /* CONFIG_ACPI_PROCFS */
80
81 #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || !defined(CONFIG_X86)
82 /* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
83 #else
84 #define HAVE_ACPI_LEGACY_ALARM
85 #endif
86
87 #ifdef  HAVE_ACPI_LEGACY_ALARM
88
89 static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
90 {
91         u32 sec, min, hr;
92         u32 day, mo, yr, cent = 0;
93         unsigned char rtc_control = 0;
94         unsigned long flags;
95
96         ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
97
98         spin_lock_irqsave(&rtc_lock, flags);
99
100         sec = CMOS_READ(RTC_SECONDS_ALARM);
101         min = CMOS_READ(RTC_MINUTES_ALARM);
102         hr = CMOS_READ(RTC_HOURS_ALARM);
103         rtc_control = CMOS_READ(RTC_CONTROL);
104
105         /* If we ever get an FACP with proper values... */
106         if (acpi_gbl_FADT.day_alarm)
107                 /* ACPI spec: only low 6 its should be cared */
108                 day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
109         else
110                 day = CMOS_READ(RTC_DAY_OF_MONTH);
111         if (acpi_gbl_FADT.month_alarm)
112                 mo = CMOS_READ(acpi_gbl_FADT.month_alarm);
113         else
114                 mo = CMOS_READ(RTC_MONTH);
115         if (acpi_gbl_FADT.century)
116                 cent = CMOS_READ(acpi_gbl_FADT.century);
117
118         yr = CMOS_READ(RTC_YEAR);
119
120         spin_unlock_irqrestore(&rtc_lock, flags);
121
122         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
123                 BCD_TO_BIN(sec);
124                 BCD_TO_BIN(min);
125                 BCD_TO_BIN(hr);
126                 BCD_TO_BIN(day);
127                 BCD_TO_BIN(mo);
128                 BCD_TO_BIN(yr);
129                 BCD_TO_BIN(cent);
130         }
131
132         /* we're trusting the FADT (see above) */
133         if (!acpi_gbl_FADT.century)
134                 /* If we're not trusting the FADT, we should at least make it
135                  * right for _this_ century... ehm, what is _this_ century?
136                  *
137                  * TBD:
138                  *  ASAP: find piece of code in the kernel, e.g. star tracker driver,
139                  *        which we can trust to determine the century correctly. Atom
140                  *        watch driver would be nice, too...
141                  *
142                  *  if that has not happened, change for first release in 2050:
143                  *        if (yr<50)
144                  *                yr += 2100;
145                  *        else
146                  *                yr += 2000;   // current line of code
147                  *
148                  *  if that has not happened either, please do on 2099/12/31:23:59:59
149                  *        s/2000/2100
150                  *
151                  */
152                 yr += 2000;
153         else
154                 yr += cent * 100;
155
156         seq_printf(seq, "%4.4u-", yr);
157         (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
158         (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
159         (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
160         (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
161         (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
162
163         return 0;
164 }
165
166 static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
167 {
168         return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
169 }
170
171 static int get_date_field(char **p, u32 * value)
172 {
173         char *next = NULL;
174         char *string_end = NULL;
175         int result = -EINVAL;
176
177         /*
178          * Try to find delimeter, only to insert null.  The end of the
179          * string won't have one, but is still valid.
180          */
181         next = strpbrk(*p, "- :");
182         if (next)
183                 *next++ = '\0';
184
185         *value = simple_strtoul(*p, &string_end, 10);
186
187         /* Signal success if we got a good digit */
188         if (string_end != *p)
189                 result = 0;
190
191         if (next)
192                 *p = next;
193
194         return result;
195 }
196
197 /* Read a possibly BCD register, always return binary */
198 static u32 cmos_bcd_read(int offset, int rtc_control)
199 {
200         u32 val = CMOS_READ(offset);
201         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
202                 BCD_TO_BIN(val);
203         return val;
204 }
205
206 /* Write binary value into possibly BCD register */
207 static void cmos_bcd_write(u32 val, int offset, int rtc_control)
208 {
209         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
210                 BIN_TO_BCD(val);
211         CMOS_WRITE(val, offset);
212 }
213
214 static ssize_t
215 acpi_system_write_alarm(struct file *file,
216                         const char __user * buffer, size_t count, loff_t * ppos)
217 {
218         int result = 0;
219         char alarm_string[30] = { '\0' };
220         char *p = alarm_string;
221         u32 sec, min, hr, day, mo, yr;
222         int adjust = 0;
223         unsigned char rtc_control = 0;
224
225         ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
226
227         if (count > sizeof(alarm_string) - 1)
228                 return_VALUE(-EINVAL);
229
230         if (copy_from_user(alarm_string, buffer, count))
231                 return_VALUE(-EFAULT);
232
233         alarm_string[count] = '\0';
234
235         /* check for time adjustment */
236         if (alarm_string[0] == '+') {
237                 p++;
238                 adjust = 1;
239         }
240
241         if ((result = get_date_field(&p, &yr)))
242                 goto end;
243         if ((result = get_date_field(&p, &mo)))
244                 goto end;
245         if ((result = get_date_field(&p, &day)))
246                 goto end;
247         if ((result = get_date_field(&p, &hr)))
248                 goto end;
249         if ((result = get_date_field(&p, &min)))
250                 goto end;
251         if ((result = get_date_field(&p, &sec)))
252                 goto end;
253
254         if (sec > 59) {
255                 min += 1;
256                 sec -= 60;
257         }
258         if (min > 59) {
259                 hr += 1;
260                 min -= 60;
261         }
262         if (hr > 23) {
263                 day += 1;
264                 hr -= 24;
265         }
266         if (day > 31) {
267                 mo += 1;
268                 day -= 31;
269         }
270         if (mo > 12) {
271                 yr += 1;
272                 mo -= 12;
273         }
274
275         spin_lock_irq(&rtc_lock);
276
277         rtc_control = CMOS_READ(RTC_CONTROL);
278
279         if (adjust) {
280                 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
281                 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
282                 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
283                 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
284                 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
285                 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
286         }
287
288         spin_unlock_irq(&rtc_lock);
289
290         if (sec > 59) {
291                 min++;
292                 sec -= 60;
293         }
294         if (min > 59) {
295                 hr++;
296                 min -= 60;
297         }
298         if (hr > 23) {
299                 day++;
300                 hr -= 24;
301         }
302         if (day > 31) {
303                 mo++;
304                 day -= 31;
305         }
306         if (mo > 12) {
307                 yr++;
308                 mo -= 12;
309         }
310
311         spin_lock_irq(&rtc_lock);
312         /*
313          * Disable alarm interrupt before setting alarm timer or else
314          * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
315          */
316         rtc_control &= ~RTC_AIE;
317         CMOS_WRITE(rtc_control, RTC_CONTROL);
318         CMOS_READ(RTC_INTR_FLAGS);
319
320         /* write the fields the rtc knows about */
321         cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
322         cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
323         cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
324
325         /*
326          * If the system supports an enhanced alarm it will have non-zero
327          * offsets into the CMOS RAM here -- which for some reason are pointing
328          * to the RTC area of memory.
329          */
330         if (acpi_gbl_FADT.day_alarm)
331                 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
332         if (acpi_gbl_FADT.month_alarm)
333                 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
334         if (acpi_gbl_FADT.century)
335                 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
336         /* enable the rtc alarm interrupt */
337         rtc_control |= RTC_AIE;
338         CMOS_WRITE(rtc_control, RTC_CONTROL);
339         CMOS_READ(RTC_INTR_FLAGS);
340
341         spin_unlock_irq(&rtc_lock);
342
343         acpi_clear_event(ACPI_EVENT_RTC);
344         acpi_enable_event(ACPI_EVENT_RTC, 0);
345
346         *ppos += count;
347
348         result = 0;
349       end:
350         return_VALUE(result ? result : count);
351 }
352 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
353
354 extern struct list_head acpi_wakeup_device_list;
355 extern spinlock_t acpi_device_lock;
356
357 static int
358 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
359 {
360         struct list_head *node, *next;
361
362         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
363
364         spin_lock(&acpi_device_lock);
365         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
366                 struct acpi_device *dev =
367                     container_of(node, struct acpi_device, wakeup_list);
368                 struct device *ldev;
369
370                 if (!dev->wakeup.flags.valid)
371                         continue;
372                 spin_unlock(&acpi_device_lock);
373
374                 ldev = acpi_get_physical_device(dev->handle);
375                 seq_printf(seq, "%s\t  S%d\t%c%-8s  ",
376                            dev->pnp.bus_id,
377                            (u32) dev->wakeup.sleep_state,
378                            dev->wakeup.flags.run_wake ? '*' : ' ',
379                            dev->wakeup.state.enabled ? "enabled" : "disabled");
380                 if (ldev)
381                         seq_printf(seq, "%s:%s",
382                                    ldev->bus ? ldev->bus->name : "no-bus",
383                                    ldev->bus_id);
384                 seq_printf(seq, "\n");
385                 put_device(ldev);
386
387                 spin_lock(&acpi_device_lock);
388         }
389         spin_unlock(&acpi_device_lock);
390         return 0;
391 }
392
393 static ssize_t
394 acpi_system_write_wakeup_device(struct file *file,
395                                 const char __user * buffer,
396                                 size_t count, loff_t * ppos)
397 {
398         struct list_head *node, *next;
399         char strbuf[5];
400         char str[5] = "";
401         int len = count;
402         struct acpi_device *found_dev = NULL;
403
404         if (len > 4)
405                 len = 4;
406
407         if (copy_from_user(strbuf, buffer, len))
408                 return -EFAULT;
409         strbuf[len] = '\0';
410         sscanf(strbuf, "%s", str);
411
412         spin_lock(&acpi_device_lock);
413         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
414                 struct acpi_device *dev =
415                     container_of(node, struct acpi_device, wakeup_list);
416                 if (!dev->wakeup.flags.valid)
417                         continue;
418
419                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
420                         dev->wakeup.state.enabled =
421                             dev->wakeup.state.enabled ? 0 : 1;
422                         found_dev = dev;
423                         break;
424                 }
425         }
426         if (found_dev) {
427                 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
428                         struct acpi_device *dev = container_of(node,
429                                                                struct
430                                                                acpi_device,
431                                                                wakeup_list);
432
433                         if ((dev != found_dev) &&
434                             (dev->wakeup.gpe_number ==
435                              found_dev->wakeup.gpe_number)
436                             && (dev->wakeup.gpe_device ==
437                                 found_dev->wakeup.gpe_device)) {
438                                 printk(KERN_WARNING
439                                        "ACPI: '%s' and '%s' have the same GPE, "
440                                        "can't disable/enable one seperately\n",
441                                        dev->pnp.bus_id, found_dev->pnp.bus_id);
442                                 dev->wakeup.state.enabled =
443                                     found_dev->wakeup.state.enabled;
444                         }
445                 }
446         }
447         spin_unlock(&acpi_device_lock);
448         return count;
449 }
450
451 static int
452 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
453 {
454         return single_open(file, acpi_system_wakeup_device_seq_show,
455                            PDE(inode)->data);
456 }
457
458 static const struct file_operations acpi_system_wakeup_device_fops = {
459         .open = acpi_system_wakeup_device_open_fs,
460         .read = seq_read,
461         .write = acpi_system_write_wakeup_device,
462         .llseek = seq_lseek,
463         .release = single_release,
464 };
465
466 #ifdef  CONFIG_ACPI_PROCFS
467 static const struct file_operations acpi_system_sleep_fops = {
468         .open = acpi_system_sleep_open_fs,
469         .read = seq_read,
470         .write = acpi_system_write_sleep,
471         .llseek = seq_lseek,
472         .release = single_release,
473 };
474 #endif                          /* CONFIG_ACPI_PROCFS */
475
476 #ifdef  HAVE_ACPI_LEGACY_ALARM
477 static const struct file_operations acpi_system_alarm_fops = {
478         .open = acpi_system_alarm_open_fs,
479         .read = seq_read,
480         .write = acpi_system_write_alarm,
481         .llseek = seq_lseek,
482         .release = single_release,
483 };
484
485 static u32 rtc_handler(void *context)
486 {
487         acpi_clear_event(ACPI_EVENT_RTC);
488         acpi_disable_event(ACPI_EVENT_RTC, 0);
489
490         return ACPI_INTERRUPT_HANDLED;
491 }
492 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
493
494 static int __init acpi_sleep_proc_init(void)
495 {
496         struct proc_dir_entry *entry = NULL;
497
498         if (acpi_disabled)
499                 return 0;
500
501 #ifdef  CONFIG_ACPI_PROCFS
502         /* 'sleep' [R/W] */
503         entry =
504             create_proc_entry("sleep", S_IFREG | S_IRUGO | S_IWUSR,
505                               acpi_root_dir);
506         if (entry)
507                 entry->proc_fops = &acpi_system_sleep_fops;
508 #endif                          /* CONFIG_ACPI_PROCFS */
509
510 #ifdef  HAVE_ACPI_LEGACY_ALARM
511         /* 'alarm' [R/W] */
512         entry =
513             create_proc_entry("alarm", S_IFREG | S_IRUGO | S_IWUSR,
514                               acpi_root_dir);
515         if (entry)
516                 entry->proc_fops = &acpi_system_alarm_fops;
517
518         acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
519 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
520
521         /* 'wakeup device' [R/W] */
522         entry =
523             create_proc_entry("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
524                               acpi_root_dir);
525         if (entry)
526                 entry->proc_fops = &acpi_system_wakeup_device_fops;
527
528         return 0;
529 }
530
531 late_initcall(acpi_sleep_proc_init);