acpi: fix oops in acpi_system_wakeup_device_seq_show
[linux-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                 sec = bcd2bin(sec);
124                 min = bcd2bin(min);
125                 hr = bcd2bin(hr);
126                 day = bcd2bin(day);
127                 mo = bcd2bin(mo);
128                 yr = bcd2bin(yr);
129                 cent = bcd2bin(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         if (*p == NULL)
182                 return result;
183
184         next = strpbrk(*p, "- :");
185         if (next)
186                 *next++ = '\0';
187
188         *value = simple_strtoul(*p, &string_end, 10);
189
190         /* Signal success if we got a good digit */
191         if (string_end != *p)
192                 result = 0;
193
194         if (next)
195                 *p = next;
196         else
197                 *p = NULL;
198
199         return result;
200 }
201
202 /* Read a possibly BCD register, always return binary */
203 static u32 cmos_bcd_read(int offset, int rtc_control)
204 {
205         u32 val = CMOS_READ(offset);
206         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
207                 val = bcd2bin(val);
208         return val;
209 }
210
211 /* Write binary value into possibly BCD register */
212 static void cmos_bcd_write(u32 val, int offset, int rtc_control)
213 {
214         if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
215                 val = bin2bcd(val);
216         CMOS_WRITE(val, offset);
217 }
218
219 static ssize_t
220 acpi_system_write_alarm(struct file *file,
221                         const char __user * buffer, size_t count, loff_t * ppos)
222 {
223         int result = 0;
224         char alarm_string[30] = { '\0' };
225         char *p = alarm_string;
226         u32 sec, min, hr, day, mo, yr;
227         int adjust = 0;
228         unsigned char rtc_control = 0;
229
230         ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
231
232         if (count > sizeof(alarm_string) - 1)
233                 return_VALUE(-EINVAL);
234
235         if (copy_from_user(alarm_string, buffer, count))
236                 return_VALUE(-EFAULT);
237
238         alarm_string[count] = '\0';
239
240         /* check for time adjustment */
241         if (alarm_string[0] == '+') {
242                 p++;
243                 adjust = 1;
244         }
245
246         if ((result = get_date_field(&p, &yr)))
247                 goto end;
248         if ((result = get_date_field(&p, &mo)))
249                 goto end;
250         if ((result = get_date_field(&p, &day)))
251                 goto end;
252         if ((result = get_date_field(&p, &hr)))
253                 goto end;
254         if ((result = get_date_field(&p, &min)))
255                 goto end;
256         if ((result = get_date_field(&p, &sec)))
257                 goto end;
258
259         spin_lock_irq(&rtc_lock);
260
261         rtc_control = CMOS_READ(RTC_CONTROL);
262
263         if (adjust) {
264                 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
265                 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
266                 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
267                 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
268                 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
269                 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
270         }
271
272         spin_unlock_irq(&rtc_lock);
273
274         if (sec > 59) {
275                 min += sec/60;
276                 sec = sec%60;
277         }
278         if (min > 59) {
279                 hr += min/60;
280                 min = min%60;
281         }
282         if (hr > 23) {
283                 day += hr/24;
284                 hr = hr%24;
285         }
286         if (day > 31) {
287                 mo += day/32;
288                 day = day%32;
289         }
290         if (mo > 12) {
291                 yr += mo/13;
292                 mo = mo%13;
293         }
294
295         spin_lock_irq(&rtc_lock);
296         /*
297          * Disable alarm interrupt before setting alarm timer or else
298          * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
299          */
300         rtc_control &= ~RTC_AIE;
301         CMOS_WRITE(rtc_control, RTC_CONTROL);
302         CMOS_READ(RTC_INTR_FLAGS);
303
304         /* write the fields the rtc knows about */
305         cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
306         cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
307         cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
308
309         /*
310          * If the system supports an enhanced alarm it will have non-zero
311          * offsets into the CMOS RAM here -- which for some reason are pointing
312          * to the RTC area of memory.
313          */
314         if (acpi_gbl_FADT.day_alarm)
315                 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
316         if (acpi_gbl_FADT.month_alarm)
317                 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
318         if (acpi_gbl_FADT.century) {
319                 if (adjust)
320                         yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
321                 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
322         }
323         /* enable the rtc alarm interrupt */
324         rtc_control |= RTC_AIE;
325         CMOS_WRITE(rtc_control, RTC_CONTROL);
326         CMOS_READ(RTC_INTR_FLAGS);
327
328         spin_unlock_irq(&rtc_lock);
329
330         acpi_clear_event(ACPI_EVENT_RTC);
331         acpi_enable_event(ACPI_EVENT_RTC, 0);
332
333         *ppos += count;
334
335         result = 0;
336       end:
337         return_VALUE(result ? result : count);
338 }
339 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
340
341 extern struct list_head acpi_wakeup_device_list;
342 extern spinlock_t acpi_device_lock;
343
344 static int
345 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
346 {
347         struct list_head *node, *next;
348
349         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
350
351         spin_lock(&acpi_device_lock);
352         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
353                 struct acpi_device *dev =
354                     container_of(node, struct acpi_device, wakeup_list);
355                 struct device *ldev;
356
357                 if (!dev->wakeup.flags.valid)
358                         continue;
359                 spin_unlock(&acpi_device_lock);
360
361                 ldev = acpi_get_physical_device(dev->handle);
362                 seq_printf(seq, "%s\t  S%d\t%c%-8s  ",
363                            dev->pnp.bus_id,
364                            (u32) dev->wakeup.sleep_state,
365                            dev->wakeup.flags.run_wake ? '*' : ' ',
366                            dev->wakeup.state.enabled ? "enabled" : "disabled");
367                 if (ldev)
368                         seq_printf(seq, "%s:%s",
369                                    ldev->bus ? ldev->bus->name : "no-bus",
370                                    dev_name(ldev));
371                 seq_printf(seq, "\n");
372                 put_device(ldev);
373
374                 spin_lock(&acpi_device_lock);
375         }
376         spin_unlock(&acpi_device_lock);
377         return 0;
378 }
379
380 static void physical_device_enable_wakeup(struct acpi_device *adev)
381 {
382         struct device *dev = acpi_get_physical_device(adev->handle);
383
384         if (dev && device_can_wakeup(dev))
385                 device_set_wakeup_enable(dev, adev->wakeup.state.enabled);
386 }
387
388 static ssize_t
389 acpi_system_write_wakeup_device(struct file *file,
390                                 const char __user * buffer,
391                                 size_t count, loff_t * ppos)
392 {
393         struct list_head *node, *next;
394         char strbuf[5];
395         char str[5] = "";
396         int len = count;
397         struct acpi_device *found_dev = NULL;
398
399         if (len > 4)
400                 len = 4;
401
402         if (copy_from_user(strbuf, buffer, len))
403                 return -EFAULT;
404         strbuf[len] = '\0';
405         sscanf(strbuf, "%s", str);
406
407         spin_lock(&acpi_device_lock);
408         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
409                 struct acpi_device *dev =
410                     container_of(node, struct acpi_device, wakeup_list);
411                 if (!dev->wakeup.flags.valid)
412                         continue;
413
414                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
415                         dev->wakeup.state.enabled =
416                             dev->wakeup.state.enabled ? 0 : 1;
417                         found_dev = dev;
418                         break;
419                 }
420         }
421         if (found_dev) {
422                 physical_device_enable_wakeup(found_dev);
423                 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
424                         struct acpi_device *dev = container_of(node,
425                                                                struct
426                                                                acpi_device,
427                                                                wakeup_list);
428
429                         if ((dev != found_dev) &&
430                             (dev->wakeup.gpe_number ==
431                              found_dev->wakeup.gpe_number)
432                             && (dev->wakeup.gpe_device ==
433                                 found_dev->wakeup.gpe_device)) {
434                                 printk(KERN_WARNING
435                                        "ACPI: '%s' and '%s' have the same GPE, "
436                                        "can't disable/enable one seperately\n",
437                                        dev->pnp.bus_id, found_dev->pnp.bus_id);
438                                 dev->wakeup.state.enabled =
439                                     found_dev->wakeup.state.enabled;
440                                 physical_device_enable_wakeup(dev);
441                         }
442                 }
443         }
444         spin_unlock(&acpi_device_lock);
445         return count;
446 }
447
448 static int
449 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
450 {
451         return single_open(file, acpi_system_wakeup_device_seq_show,
452                            PDE(inode)->data);
453 }
454
455 static const struct file_operations acpi_system_wakeup_device_fops = {
456         .owner = THIS_MODULE,
457         .open = acpi_system_wakeup_device_open_fs,
458         .read = seq_read,
459         .write = acpi_system_write_wakeup_device,
460         .llseek = seq_lseek,
461         .release = single_release,
462 };
463
464 #ifdef  CONFIG_ACPI_PROCFS
465 static const struct file_operations acpi_system_sleep_fops = {
466         .owner = THIS_MODULE,
467         .open = acpi_system_sleep_open_fs,
468         .read = seq_read,
469         .write = acpi_system_write_sleep,
470         .llseek = seq_lseek,
471         .release = single_release,
472 };
473 #endif                          /* CONFIG_ACPI_PROCFS */
474
475 #ifdef  HAVE_ACPI_LEGACY_ALARM
476 static const struct file_operations acpi_system_alarm_fops = {
477         .owner = THIS_MODULE,
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         if (acpi_disabled)
497                 return 0;
498
499 #ifdef  CONFIG_ACPI_PROCFS
500         /* 'sleep' [R/W] */
501         proc_create("sleep", S_IFREG | S_IRUGO | S_IWUSR,
502                     acpi_root_dir, &acpi_system_sleep_fops);
503 #endif                          /* CONFIG_ACPI_PROCFS */
504
505 #ifdef  HAVE_ACPI_LEGACY_ALARM
506         /* 'alarm' [R/W] */
507         proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
508                     acpi_root_dir, &acpi_system_alarm_fops);
509
510         acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
511         /*
512          * Disable the RTC event after installing RTC handler.
513          * Only when RTC alarm is set will it be enabled.
514          */
515         acpi_clear_event(ACPI_EVENT_RTC);
516         acpi_disable_event(ACPI_EVENT_RTC, 0);
517 #endif                          /* HAVE_ACPI_LEGACY_ALARM */
518
519         /* 'wakeup device' [R/W] */
520         proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
521                     acpi_root_dir, &acpi_system_wakeup_device_fops);
522
523         return 0;
524 }
525
526 late_initcall(acpi_sleep_proc_init);