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-rw-r--r--drivers/acpi/proc.c531
1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
new file mode 100644
index 000000000000..428c911dba08
--- /dev/null
+++ b/drivers/acpi/proc.c
@@ -0,0 +1,531 @@
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
25ACPI_MODULE_NAME("sleep")
26#ifdef CONFIG_ACPI_PROCFS
27static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
28{
29 int i;
30
31 for (i = 0; i <= ACPI_STATE_S5; i++) {
32 if (sleep_states[i]) {
33 seq_printf(seq, "S%d ", i);
34 }
35 }
36
37 seq_puts(seq, "\n");
38
39 return 0;
40}
41
42static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
43{
44 return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
45}
46
47static ssize_t
48acpi_system_write_sleep(struct file *file,
49 const char __user * buffer, size_t count, loff_t * ppos)
50{
51 char str[12];
52 u32 state = 0;
53 int error = 0;
54
55 if (count > sizeof(str) - 1)
56 goto Done;
57 memset(str, 0, sizeof(str));
58 if (copy_from_user(str, buffer, count))
59 return -EFAULT;
60
61 /* Check for S4 bios request */
62 if (!strcmp(str, "4b")) {
63 error = acpi_suspend(4);
64 goto Done;
65 }
66 state = simple_strtoul(str, NULL, 0);
67#ifdef CONFIG_HIBERNATION
68 if (state == 4) {
69 error = hibernate();
70 goto Done;
71 }
72#endif
73 error = acpi_suspend(state);
74 Done:
75 return error ? error : count;
76}
77#endif /* CONFIG_ACPI_PROCFS */
78
79#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || !defined(CONFIG_X86)
80/* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
81#else
82#define HAVE_ACPI_LEGACY_ALARM
83#endif
84
85#ifdef HAVE_ACPI_LEGACY_ALARM
86
87static u32 cmos_bcd_read(int offset, int rtc_control);
88
89static 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 u32 today = 0;
94 unsigned char rtc_control = 0;
95 unsigned long flags;
96
97 spin_lock_irqsave(&rtc_lock, flags);
98
99 rtc_control = CMOS_READ(RTC_CONTROL);
100 sec = cmos_bcd_read(RTC_SECONDS_ALARM, rtc_control);
101 min = cmos_bcd_read(RTC_MINUTES_ALARM, rtc_control);
102 hr = cmos_bcd_read(RTC_HOURS_ALARM, rtc_control);
103
104 /* If we ever get an FACP with proper values... */
105 if (acpi_gbl_FADT.day_alarm) {
106 /* ACPI spec: only low 6 its should be cared */
107 day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
108 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
109 day = bcd2bin(day);
110 } else
111 day = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
112 if (acpi_gbl_FADT.month_alarm)
113 mo = cmos_bcd_read(acpi_gbl_FADT.month_alarm, rtc_control);
114 else {
115 mo = cmos_bcd_read(RTC_MONTH, rtc_control);
116 today = cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
117 }
118 if (acpi_gbl_FADT.century)
119 cent = cmos_bcd_read(acpi_gbl_FADT.century, rtc_control);
120
121 yr = cmos_bcd_read(RTC_YEAR, rtc_control);
122
123 spin_unlock_irqrestore(&rtc_lock, flags);
124
125 /* we're trusting the FADT (see above) */
126 if (!acpi_gbl_FADT.century)
127 /* If we're not trusting the FADT, we should at least make it
128 * right for _this_ century... ehm, what is _this_ century?
129 *
130 * TBD:
131 * ASAP: find piece of code in the kernel, e.g. star tracker driver,
132 * which we can trust to determine the century correctly. Atom
133 * watch driver would be nice, too...
134 *
135 * if that has not happened, change for first release in 2050:
136 * if (yr<50)
137 * yr += 2100;
138 * else
139 * yr += 2000; // current line of code
140 *
141 * if that has not happened either, please do on 2099/12/31:23:59:59
142 * s/2000/2100
143 *
144 */
145 yr += 2000;
146 else
147 yr += cent * 100;
148
149 /*
150 * Show correct dates for alarms up to a month into the future.
151 * This solves issues for nearly all situations with the common
152 * 30-day alarm clocks in PC hardware.
153 */
154 if (day < today) {
155 if (mo < 12) {
156 mo += 1;
157 } else {
158 mo = 1;
159 yr += 1;
160 }
161 }
162
163 seq_printf(seq, "%4.4u-", yr);
164 (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
165 (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
166 (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
167 (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
168 (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
169
170 return 0;
171}
172
173static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
174{
175 return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
176}
177
178static int get_date_field(char **p, u32 * value)
179{
180 char *next = NULL;
181 char *string_end = NULL;
182 int result = -EINVAL;
183
184 /*
185 * Try to find delimeter, only to insert null. The end of the
186 * string won't have one, but is still valid.
187 */
188 if (*p == NULL)
189 return result;
190
191 next = strpbrk(*p, "- :");
192 if (next)
193 *next++ = '\0';
194
195 *value = simple_strtoul(*p, &string_end, 10);
196
197 /* Signal success if we got a good digit */
198 if (string_end != *p)
199 result = 0;
200
201 if (next)
202 *p = next;
203 else
204 *p = NULL;
205
206 return result;
207}
208
209/* Read a possibly BCD register, always return binary */
210static u32 cmos_bcd_read(int offset, int rtc_control)
211{
212 u32 val = CMOS_READ(offset);
213 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
214 val = bcd2bin(val);
215 return val;
216}
217
218/* Write binary value into possibly BCD register */
219static void cmos_bcd_write(u32 val, int offset, int rtc_control)
220{
221 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
222 val = bin2bcd(val);
223 CMOS_WRITE(val, offset);
224}
225
226static ssize_t
227acpi_system_write_alarm(struct file *file,
228 const char __user * buffer, size_t count, loff_t * ppos)
229{
230 int result = 0;
231 char alarm_string[30] = { '\0' };
232 char *p = alarm_string;
233 u32 sec, min, hr, day, mo, yr;
234 int adjust = 0;
235 unsigned char rtc_control = 0;
236
237 if (count > sizeof(alarm_string) - 1)
238 return -EINVAL;
239
240 if (copy_from_user(alarm_string, buffer, count))
241 return -EFAULT;
242
243 alarm_string[count] = '\0';
244
245 /* check for time adjustment */
246 if (alarm_string[0] == '+') {
247 p++;
248 adjust = 1;
249 }
250
251 if ((result = get_date_field(&p, &yr)))
252 goto end;
253 if ((result = get_date_field(&p, &mo)))
254 goto end;
255 if ((result = get_date_field(&p, &day)))
256 goto end;
257 if ((result = get_date_field(&p, &hr)))
258 goto end;
259 if ((result = get_date_field(&p, &min)))
260 goto end;
261 if ((result = get_date_field(&p, &sec)))
262 goto end;
263
264 spin_lock_irq(&rtc_lock);
265
266 rtc_control = CMOS_READ(RTC_CONTROL);
267
268 if (adjust) {
269 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
270 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
271 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
272 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
273 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
274 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
275 }
276
277 spin_unlock_irq(&rtc_lock);
278
279 if (sec > 59) {
280 min += sec/60;
281 sec = sec%60;
282 }
283 if (min > 59) {
284 hr += min/60;
285 min = min%60;
286 }
287 if (hr > 23) {
288 day += hr/24;
289 hr = hr%24;
290 }
291 if (day > 31) {
292 mo += day/32;
293 day = day%32;
294 }
295 if (mo > 12) {
296 yr += mo/13;
297 mo = mo%13;
298 }
299
300 spin_lock_irq(&rtc_lock);
301 /*
302 * Disable alarm interrupt before setting alarm timer or else
303 * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
304 */
305 rtc_control &= ~RTC_AIE;
306 CMOS_WRITE(rtc_control, RTC_CONTROL);
307 CMOS_READ(RTC_INTR_FLAGS);
308
309 /* write the fields the rtc knows about */
310 cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
311 cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
312 cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
313
314 /*
315 * If the system supports an enhanced alarm it will have non-zero
316 * offsets into the CMOS RAM here -- which for some reason are pointing
317 * to the RTC area of memory.
318 */
319 if (acpi_gbl_FADT.day_alarm)
320 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
321 if (acpi_gbl_FADT.month_alarm)
322 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
323 if (acpi_gbl_FADT.century) {
324 if (adjust)
325 yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
326 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
327 }
328 /* enable the rtc alarm interrupt */
329 rtc_control |= RTC_AIE;
330 CMOS_WRITE(rtc_control, RTC_CONTROL);
331 CMOS_READ(RTC_INTR_FLAGS);
332
333 spin_unlock_irq(&rtc_lock);
334
335 acpi_clear_event(ACPI_EVENT_RTC);
336 acpi_enable_event(ACPI_EVENT_RTC, 0);
337
338 *ppos += count;
339
340 result = 0;
341 end:
342 return result ? result : count;
343}
344#endif /* HAVE_ACPI_LEGACY_ALARM */
345
346extern struct list_head acpi_wakeup_device_list;
347extern spinlock_t acpi_device_lock;
348
349static int
350acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
351{
352 struct list_head *node, *next;
353
354 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
355
356 spin_lock(&acpi_device_lock);
357 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
358 struct acpi_device *dev =
359 container_of(node, struct acpi_device, wakeup_list);
360 struct device *ldev;
361
362 if (!dev->wakeup.flags.valid)
363 continue;
364 spin_unlock(&acpi_device_lock);
365
366 ldev = acpi_get_physical_device(dev->handle);
367 seq_printf(seq, "%s\t S%d\t%c%-8s ",
368 dev->pnp.bus_id,
369 (u32) dev->wakeup.sleep_state,
370 dev->wakeup.flags.run_wake ? '*' : ' ',
371 dev->wakeup.state.enabled ? "enabled" : "disabled");
372 if (ldev)
373 seq_printf(seq, "%s:%s",
374 ldev->bus ? ldev->bus->name : "no-bus",
375 dev_name(ldev));
376 seq_printf(seq, "\n");
377 put_device(ldev);
378
379 spin_lock(&acpi_device_lock);
380 }
381 spin_unlock(&acpi_device_lock);
382 return 0;
383}
384
385static void physical_device_enable_wakeup(struct acpi_device *adev)
386{
387 struct device *dev = acpi_get_physical_device(adev->handle);
388
389 if (dev && device_can_wakeup(dev))
390 device_set_wakeup_enable(dev, adev->wakeup.state.enabled);
391}
392
393static ssize_t
394acpi_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 physical_device_enable_wakeup(found_dev);
428 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
429 struct acpi_device *dev = container_of(node,
430 struct
431 acpi_device,
432 wakeup_list);
433
434 if ((dev != found_dev) &&
435 (dev->wakeup.gpe_number ==
436 found_dev->wakeup.gpe_number)
437 && (dev->wakeup.gpe_device ==
438 found_dev->wakeup.gpe_device)) {
439 printk(KERN_WARNING
440 "ACPI: '%s' and '%s' have the same GPE, "
441 "can't disable/enable one seperately\n",
442 dev->pnp.bus_id, found_dev->pnp.bus_id);
443 dev->wakeup.state.enabled =
444 found_dev->wakeup.state.enabled;
445 physical_device_enable_wakeup(dev);
446 }
447 }
448 }
449 spin_unlock(&acpi_device_lock);
450 return count;
451}
452
453static int
454acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
455{
456 return single_open(file, acpi_system_wakeup_device_seq_show,
457 PDE(inode)->data);
458}
459
460static const struct file_operations acpi_system_wakeup_device_fops = {
461 .owner = THIS_MODULE,
462 .open = acpi_system_wakeup_device_open_fs,
463 .read = seq_read,
464 .write = acpi_system_write_wakeup_device,
465 .llseek = seq_lseek,
466 .release = single_release,
467};
468
469#ifdef CONFIG_ACPI_PROCFS
470static const struct file_operations acpi_system_sleep_fops = {
471 .owner = THIS_MODULE,
472 .open = acpi_system_sleep_open_fs,
473 .read = seq_read,
474 .write = acpi_system_write_sleep,
475 .llseek = seq_lseek,
476 .release = single_release,
477};
478#endif /* CONFIG_ACPI_PROCFS */
479
480#ifdef HAVE_ACPI_LEGACY_ALARM
481static const struct file_operations acpi_system_alarm_fops = {
482 .owner = THIS_MODULE,
483 .open = acpi_system_alarm_open_fs,
484 .read = seq_read,
485 .write = acpi_system_write_alarm,
486 .llseek = seq_lseek,
487 .release = single_release,
488};
489
490static u32 rtc_handler(void *context)
491{
492 acpi_clear_event(ACPI_EVENT_RTC);
493 acpi_disable_event(ACPI_EVENT_RTC, 0);
494
495 return ACPI_INTERRUPT_HANDLED;
496}
497#endif /* HAVE_ACPI_LEGACY_ALARM */
498
499static int __init acpi_sleep_proc_init(void)
500{
501 if (acpi_disabled)
502 return 0;
503
504#ifdef CONFIG_ACPI_PROCFS
505 /* 'sleep' [R/W] */
506 proc_create("sleep", S_IFREG | S_IRUGO | S_IWUSR,
507 acpi_root_dir, &acpi_system_sleep_fops);
508#endif /* CONFIG_ACPI_PROCFS */
509
510#ifdef HAVE_ACPI_LEGACY_ALARM
511 /* 'alarm' [R/W] */
512 proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
513 acpi_root_dir, &acpi_system_alarm_fops);
514
515 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
516 /*
517 * Disable the RTC event after installing RTC handler.
518 * Only when RTC alarm is set will it be enabled.
519 */
520 acpi_clear_event(ACPI_EVENT_RTC);
521 acpi_disable_event(ACPI_EVENT_RTC, 0);
522#endif /* HAVE_ACPI_LEGACY_ALARM */
523
524 /* 'wakeup device' [R/W] */
525 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
526 acpi_root_dir, &acpi_system_wakeup_device_fops);
527
528 return 0;
529}
530
531late_initcall(acpi_sleep_proc_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-19 06:13:19 -0500