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-rw-r--r--drivers/acpi/proc.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
new file mode 100644
index 000000000000..1c4851ff2657
--- /dev/null
+++ b/drivers/acpi/proc.c
@@ -0,0 +1,520 @@
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 int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
88{
89 u32 sec, min, hr;
90 u32 day, mo, yr, cent = 0;
91 unsigned char rtc_control = 0;
92 unsigned long flags;
93
94 spin_lock_irqsave(&rtc_lock, flags);
95
96 sec = CMOS_READ(RTC_SECONDS_ALARM);
97 min = CMOS_READ(RTC_MINUTES_ALARM);
98 hr = CMOS_READ(RTC_HOURS_ALARM);
99 rtc_control = CMOS_READ(RTC_CONTROL);
100
101 /* If we ever get an FACP with proper values... */
102 if (acpi_gbl_FADT.day_alarm)
103 /* ACPI spec: only low 6 its should be cared */
104 day = CMOS_READ(acpi_gbl_FADT.day_alarm) & 0x3F;
105 else
106 day = CMOS_READ(RTC_DAY_OF_MONTH);
107 if (acpi_gbl_FADT.month_alarm)
108 mo = CMOS_READ(acpi_gbl_FADT.month_alarm);
109 else
110 mo = CMOS_READ(RTC_MONTH);
111 if (acpi_gbl_FADT.century)
112 cent = CMOS_READ(acpi_gbl_FADT.century);
113
114 yr = CMOS_READ(RTC_YEAR);
115
116 spin_unlock_irqrestore(&rtc_lock, flags);
117
118 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
119 sec = bcd2bin(sec);
120 min = bcd2bin(min);
121 hr = bcd2bin(hr);
122 day = bcd2bin(day);
123 mo = bcd2bin(mo);
124 yr = bcd2bin(yr);
125 cent = bcd2bin(cent);
126 }
127
128 /* we're trusting the FADT (see above) */
129 if (!acpi_gbl_FADT.century)
130 /* If we're not trusting the FADT, we should at least make it
131 * right for _this_ century... ehm, what is _this_ century?
132 *
133 * TBD:
134 * ASAP: find piece of code in the kernel, e.g. star tracker driver,
135 * which we can trust to determine the century correctly. Atom
136 * watch driver would be nice, too...
137 *
138 * if that has not happened, change for first release in 2050:
139 * if (yr<50)
140 * yr += 2100;
141 * else
142 * yr += 2000; // current line of code
143 *
144 * if that has not happened either, please do on 2099/12/31:23:59:59
145 * s/2000/2100
146 *
147 */
148 yr += 2000;
149 else
150 yr += cent * 100;
151
152 seq_printf(seq, "%4.4u-", yr);
153 (mo > 12) ? seq_puts(seq, "**-") : seq_printf(seq, "%2.2u-", mo);
154 (day > 31) ? seq_puts(seq, "** ") : seq_printf(seq, "%2.2u ", day);
155 (hr > 23) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", hr);
156 (min > 59) ? seq_puts(seq, "**:") : seq_printf(seq, "%2.2u:", min);
157 (sec > 59) ? seq_puts(seq, "**\n") : seq_printf(seq, "%2.2u\n", sec);
158
159 return 0;
160}
161
162static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
163{
164 return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
165}
166
167static int get_date_field(char **p, u32 * value)
168{
169 char *next = NULL;
170 char *string_end = NULL;
171 int result = -EINVAL;
172
173 /*
174 * Try to find delimeter, only to insert null. The end of the
175 * string won't have one, but is still valid.
176 */
177 if (*p == NULL)
178 return result;
179
180 next = strpbrk(*p, "- :");
181 if (next)
182 *next++ = '\0';
183
184 *value = simple_strtoul(*p, &string_end, 10);
185
186 /* Signal success if we got a good digit */
187 if (string_end != *p)
188 result = 0;
189
190 if (next)
191 *p = next;
192 else
193 *p = NULL;
194
195 return result;
196}
197
198/* Read a possibly BCD register, always return binary */
199static u32 cmos_bcd_read(int offset, int rtc_control)
200{
201 u32 val = CMOS_READ(offset);
202 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
203 val = bcd2bin(val);
204 return val;
205}
206
207/* Write binary value into possibly BCD register */
208static void cmos_bcd_write(u32 val, int offset, int rtc_control)
209{
210 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
211 val = bin2bcd(val);
212 CMOS_WRITE(val, offset);
213}
214
215static ssize_t
216acpi_system_write_alarm(struct file *file,
217 const char __user * buffer, size_t count, loff_t * ppos)
218{
219 int result = 0;
220 char alarm_string[30] = { '\0' };
221 char *p = alarm_string;
222 u32 sec, min, hr, day, mo, yr;
223 int adjust = 0;
224 unsigned char rtc_control = 0;
225
226 if (count > sizeof(alarm_string) - 1)
227 return -EINVAL;
228
229 if (copy_from_user(alarm_string, buffer, count))
230 return -EFAULT;
231
232 alarm_string[count] = '\0';
233
234 /* check for time adjustment */
235 if (alarm_string[0] == '+') {
236 p++;
237 adjust = 1;
238 }
239
240 if ((result = get_date_field(&p, &yr)))
241 goto end;
242 if ((result = get_date_field(&p, &mo)))
243 goto end;
244 if ((result = get_date_field(&p, &day)))
245 goto end;
246 if ((result = get_date_field(&p, &hr)))
247 goto end;
248 if ((result = get_date_field(&p, &min)))
249 goto end;
250 if ((result = get_date_field(&p, &sec)))
251 goto end;
252
253 spin_lock_irq(&rtc_lock);
254
255 rtc_control = CMOS_READ(RTC_CONTROL);
256
257 if (adjust) {
258 yr += cmos_bcd_read(RTC_YEAR, rtc_control);
259 mo += cmos_bcd_read(RTC_MONTH, rtc_control);
260 day += cmos_bcd_read(RTC_DAY_OF_MONTH, rtc_control);
261 hr += cmos_bcd_read(RTC_HOURS, rtc_control);
262 min += cmos_bcd_read(RTC_MINUTES, rtc_control);
263 sec += cmos_bcd_read(RTC_SECONDS, rtc_control);
264 }
265
266 spin_unlock_irq(&rtc_lock);
267
268 if (sec > 59) {
269 min += sec/60;
270 sec = sec%60;
271 }
272 if (min > 59) {
273 hr += min/60;
274 min = min%60;
275 }
276 if (hr > 23) {
277 day += hr/24;
278 hr = hr%24;
279 }
280 if (day > 31) {
281 mo += day/32;
282 day = day%32;
283 }
284 if (mo > 12) {
285 yr += mo/13;
286 mo = mo%13;
287 }
288
289 spin_lock_irq(&rtc_lock);
290 /*
291 * Disable alarm interrupt before setting alarm timer or else
292 * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
293 */
294 rtc_control &= ~RTC_AIE;
295 CMOS_WRITE(rtc_control, RTC_CONTROL);
296 CMOS_READ(RTC_INTR_FLAGS);
297
298 /* write the fields the rtc knows about */
299 cmos_bcd_write(hr, RTC_HOURS_ALARM, rtc_control);
300 cmos_bcd_write(min, RTC_MINUTES_ALARM, rtc_control);
301 cmos_bcd_write(sec, RTC_SECONDS_ALARM, rtc_control);
302
303 /*
304 * If the system supports an enhanced alarm it will have non-zero
305 * offsets into the CMOS RAM here -- which for some reason are pointing
306 * to the RTC area of memory.
307 */
308 if (acpi_gbl_FADT.day_alarm)
309 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
310 if (acpi_gbl_FADT.month_alarm)
311 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
312 if (acpi_gbl_FADT.century) {
313 if (adjust)
314 yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
315 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
316 }
317 /* enable the rtc alarm interrupt */
318 rtc_control |= RTC_AIE;
319 CMOS_WRITE(rtc_control, RTC_CONTROL);
320 CMOS_READ(RTC_INTR_FLAGS);
321
322 spin_unlock_irq(&rtc_lock);
323
324 acpi_clear_event(ACPI_EVENT_RTC);
325 acpi_enable_event(ACPI_EVENT_RTC, 0);
326
327 *ppos += count;
328
329 result = 0;
330 end:
331 return result ? result : count;
332}
333#endif /* HAVE_ACPI_LEGACY_ALARM */
334
335extern struct list_head acpi_wakeup_device_list;
336extern spinlock_t acpi_device_lock;
337
338static int
339acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
340{
341 struct list_head *node, *next;
342
343 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
344
345 spin_lock(&acpi_device_lock);
346 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
347 struct acpi_device *dev =
348 container_of(node, struct acpi_device, wakeup_list);
349 struct device *ldev;
350
351 if (!dev->wakeup.flags.valid)
352 continue;
353 spin_unlock(&acpi_device_lock);
354
355 ldev = acpi_get_physical_device(dev->handle);
356 seq_printf(seq, "%s\t S%d\t%c%-8s ",
357 dev->pnp.bus_id,
358 (u32) dev->wakeup.sleep_state,
359 dev->wakeup.flags.run_wake ? '*' : ' ',
360 dev->wakeup.state.enabled ? "enabled" : "disabled");
361 if (ldev)
362 seq_printf(seq, "%s:%s",
363 ldev->bus ? ldev->bus->name : "no-bus",
364 dev_name(ldev));
365 seq_printf(seq, "\n");
366 put_device(ldev);
367
368 spin_lock(&acpi_device_lock);
369 }
370 spin_unlock(&acpi_device_lock);
371 return 0;
372}
373
374static void physical_device_enable_wakeup(struct acpi_device *adev)
375{
376 struct device *dev = acpi_get_physical_device(adev->handle);
377
378 if (dev && device_can_wakeup(dev))
379 device_set_wakeup_enable(dev, adev->wakeup.state.enabled);
380}
381
382static ssize_t
383acpi_system_write_wakeup_device(struct file *file,
384 const char __user * buffer,
385 size_t count, loff_t * ppos)
386{
387 struct list_head *node, *next;
388 char strbuf[5];
389 char str[5] = "";
390 int len = count;
391 struct acpi_device *found_dev = NULL;
392
393 if (len > 4)
394 len = 4;
395
396 if (copy_from_user(strbuf, buffer, len))
397 return -EFAULT;
398 strbuf[len] = '\0';
399 sscanf(strbuf, "%s", str);
400
401 spin_lock(&acpi_device_lock);
402 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
403 struct acpi_device *dev =
404 container_of(node, struct acpi_device, wakeup_list);
405 if (!dev->wakeup.flags.valid)
406 continue;
407
408 if (!strncmp(dev->pnp.bus_id, str, 4)) {
409 dev->wakeup.state.enabled =
410 dev->wakeup.state.enabled ? 0 : 1;
411 found_dev = dev;
412 break;
413 }
414 }
415 if (found_dev) {
416 physical_device_enable_wakeup(found_dev);
417 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
418 struct acpi_device *dev = container_of(node,
419 struct
420 acpi_device,
421 wakeup_list);
422
423 if ((dev != found_dev) &&
424 (dev->wakeup.gpe_number ==
425 found_dev->wakeup.gpe_number)
426 && (dev->wakeup.gpe_device ==
427 found_dev->wakeup.gpe_device)) {
428 printk(KERN_WARNING
429 "ACPI: '%s' and '%s' have the same GPE, "
430 "can't disable/enable one seperately\n",
431 dev->pnp.bus_id, found_dev->pnp.bus_id);
432 dev->wakeup.state.enabled =
433 found_dev->wakeup.state.enabled;
434 physical_device_enable_wakeup(dev);
435 }
436 }
437 }
438 spin_unlock(&acpi_device_lock);
439 return count;
440}
441
442static int
443acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
444{
445 return single_open(file, acpi_system_wakeup_device_seq_show,
446 PDE(inode)->data);
447}
448
449static const struct file_operations acpi_system_wakeup_device_fops = {
450 .owner = THIS_MODULE,
451 .open = acpi_system_wakeup_device_open_fs,
452 .read = seq_read,
453 .write = acpi_system_write_wakeup_device,
454 .llseek = seq_lseek,
455 .release = single_release,
456};
457
458#ifdef CONFIG_ACPI_PROCFS
459static const struct file_operations acpi_system_sleep_fops = {
460 .owner = THIS_MODULE,
461 .open = acpi_system_sleep_open_fs,
462 .read = seq_read,
463 .write = acpi_system_write_sleep,
464 .llseek = seq_lseek,
465 .release = single_release,
466};
467#endif /* CONFIG_ACPI_PROCFS */
468
469#ifdef HAVE_ACPI_LEGACY_ALARM
470static const struct file_operations acpi_system_alarm_fops = {
471 .owner = THIS_MODULE,
472 .open = acpi_system_alarm_open_fs,
473 .read = seq_read,
474 .write = acpi_system_write_alarm,
475 .llseek = seq_lseek,
476 .release = single_release,
477};
478
479static u32 rtc_handler(void *context)
480{
481 acpi_clear_event(ACPI_EVENT_RTC);
482 acpi_disable_event(ACPI_EVENT_RTC, 0);
483
484 return ACPI_INTERRUPT_HANDLED;
485}
486#endif /* HAVE_ACPI_LEGACY_ALARM */
487
488static int __init acpi_sleep_proc_init(void)
489{
490 if (acpi_disabled)
491 return 0;
492
493#ifdef CONFIG_ACPI_PROCFS
494 /* 'sleep' [R/W] */
495 proc_create("sleep", S_IFREG | S_IRUGO | S_IWUSR,
496 acpi_root_dir, &acpi_system_sleep_fops);
497#endif /* CONFIG_ACPI_PROCFS */
498
499#ifdef HAVE_ACPI_LEGACY_ALARM
500 /* 'alarm' [R/W] */
501 proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
502 acpi_root_dir, &acpi_system_alarm_fops);
503
504 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
505 /*
506 * Disable the RTC event after installing RTC handler.
507 * Only when RTC alarm is set will it be enabled.
508 */
509 acpi_clear_event(ACPI_EVENT_RTC);
510 acpi_disable_event(ACPI_EVENT_RTC, 0);
511#endif /* HAVE_ACPI_LEGACY_ALARM */
512
513 /* 'wakeup device' [R/W] */
514 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
515 acpi_root_dir, &acpi_system_wakeup_device_fops);
516
517 return 0;
518}
519
520late_initcall(acpi_sleep_proc_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 14:13:22 -0400