conn rcv_lock converted to spinlock, struct cor_sock created, kernel_packet skb_clone...
[cor_2_6_31.git] / drivers / acpi / proc.c
blobd0d550d22a6d43a14ccecec6658e9fb2773d6b70
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>
7 #include <acpi/acpi_bus.h>
8 #include <acpi/acpi_drivers.h>
10 #ifdef CONFIG_X86
11 #include <linux/mc146818rtc.h>
12 #endif
14 #include "sleep.h"
16 #define _COMPONENT ACPI_SYSTEM_COMPONENT
19 * this file provides support for:
20 * /proc/acpi/sleep
21 * /proc/acpi/alarm
22 * /proc/acpi/wakeup
25 ACPI_MODULE_NAME("sleep")
26 #ifdef CONFIG_ACPI_PROCFS
27 static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
29 int i;
31 for (i = 0; i <= ACPI_STATE_S5; i++) {
32 if (sleep_states[i]) {
33 seq_printf(seq, "S%d ", i);
37 seq_puts(seq, "\n");
39 return 0;
42 static int acpi_system_sleep_open_fs(struct inode *inode, struct file *file)
44 return single_open(file, acpi_system_sleep_seq_show, PDE(inode)->data);
47 static ssize_t
48 acpi_system_write_sleep(struct file *file,
49 const char __user * buffer, size_t count, loff_t * ppos)
51 char str[12];
52 u32 state = 0;
53 int error = 0;
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;
61 /* Check for S4 bios request */
62 if (!strcmp(str, "4b")) {
63 error = acpi_suspend(4);
64 goto Done;
66 state = simple_strtoul(str, NULL, 0);
67 #ifdef CONFIG_HIBERNATION
68 if (state == 4) {
69 error = hibernate();
70 goto Done;
72 #endif
73 error = acpi_suspend(state);
74 Done:
75 return error ? error : count;
77 #endif /* CONFIG_ACPI_PROCFS */
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
85 #ifdef HAVE_ACPI_LEGACY_ALARM
87 static u32 cmos_bcd_read(int offset, int rtc_control);
89 static int acpi_system_alarm_seq_show(struct seq_file *seq, void *offset)
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;
97 spin_lock_irqsave(&rtc_lock, flags);
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);
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);
118 if (acpi_gbl_FADT.century)
119 cent = cmos_bcd_read(acpi_gbl_FADT.century, rtc_control);
121 yr = cmos_bcd_read(RTC_YEAR, rtc_control);
123 spin_unlock_irqrestore(&rtc_lock, flags);
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?
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...
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
141 * if that has not happened either, please do on 2099/12/31:23:59:59
142 * s/2000/2100
145 yr += 2000;
146 else
147 yr += cent * 100;
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.
154 if (day < today) {
155 if (mo < 12) {
156 mo += 1;
157 } else {
158 mo = 1;
159 yr += 1;
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);
170 return 0;
173 static int acpi_system_alarm_open_fs(struct inode *inode, struct file *file)
175 return single_open(file, acpi_system_alarm_seq_show, PDE(inode)->data);
178 static int get_date_field(char **p, u32 * value)
180 char *next = NULL;
181 char *string_end = NULL;
182 int result = -EINVAL;
185 * Try to find delimeter, only to insert null. The end of the
186 * string won't have one, but is still valid.
188 if (*p == NULL)
189 return result;
191 next = strpbrk(*p, "- :");
192 if (next)
193 *next++ = '\0';
195 *value = simple_strtoul(*p, &string_end, 10);
197 /* Signal success if we got a good digit */
198 if (string_end != *p)
199 result = 0;
201 if (next)
202 *p = next;
203 else
204 *p = NULL;
206 return result;
209 /* Read a possibly BCD register, always return binary */
210 static u32 cmos_bcd_read(int offset, int rtc_control)
212 u32 val = CMOS_READ(offset);
213 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
214 val = bcd2bin(val);
215 return val;
218 /* Write binary value into possibly BCD register */
219 static void cmos_bcd_write(u32 val, int offset, int rtc_control)
221 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
222 val = bin2bcd(val);
223 CMOS_WRITE(val, offset);
226 static ssize_t
227 acpi_system_write_alarm(struct file *file,
228 const char __user * buffer, size_t count, loff_t * ppos)
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;
237 if (count > sizeof(alarm_string) - 1)
238 return -EINVAL;
240 if (copy_from_user(alarm_string, buffer, count))
241 return -EFAULT;
243 alarm_string[count] = '\0';
245 /* check for time adjustment */
246 if (alarm_string[0] == '+') {
247 p++;
248 adjust = 1;
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;
264 spin_lock_irq(&rtc_lock);
266 rtc_control = CMOS_READ(RTC_CONTROL);
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);
277 spin_unlock_irq(&rtc_lock);
279 if (sec > 59) {
280 min += sec/60;
281 sec = sec%60;
283 if (min > 59) {
284 hr += min/60;
285 min = min%60;
287 if (hr > 23) {
288 day += hr/24;
289 hr = hr%24;
291 if (day > 31) {
292 mo += day/32;
293 day = day%32;
295 if (mo > 12) {
296 yr += mo/13;
297 mo = mo%13;
300 spin_lock_irq(&rtc_lock);
302 * Disable alarm interrupt before setting alarm timer or else
303 * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
305 rtc_control &= ~RTC_AIE;
306 CMOS_WRITE(rtc_control, RTC_CONTROL);
307 CMOS_READ(RTC_INTR_FLAGS);
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);
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.
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);
328 /* enable the rtc alarm interrupt */
329 rtc_control |= RTC_AIE;
330 CMOS_WRITE(rtc_control, RTC_CONTROL);
331 CMOS_READ(RTC_INTR_FLAGS);
333 spin_unlock_irq(&rtc_lock);
335 acpi_clear_event(ACPI_EVENT_RTC);
336 acpi_enable_event(ACPI_EVENT_RTC, 0);
338 *ppos += count;
340 result = 0;
341 end:
342 return result ? result : count;
344 #endif /* HAVE_ACPI_LEGACY_ALARM */
346 static int
347 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
349 struct list_head *node, *next;
351 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
353 mutex_lock(&acpi_device_lock);
354 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
355 struct acpi_device *dev =
356 container_of(node, struct acpi_device, wakeup_list);
357 struct device *ldev;
359 if (!dev->wakeup.flags.valid)
360 continue;
362 ldev = acpi_get_physical_device(dev->handle);
363 seq_printf(seq, "%s\t S%d\t%c%-8s ",
364 dev->pnp.bus_id,
365 (u32) dev->wakeup.sleep_state,
366 dev->wakeup.flags.run_wake ? '*' : ' ',
367 dev->wakeup.state.enabled ? "enabled" : "disabled");
368 if (ldev)
369 seq_printf(seq, "%s:%s",
370 ldev->bus ? ldev->bus->name : "no-bus",
371 dev_name(ldev));
372 seq_printf(seq, "\n");
373 put_device(ldev);
376 mutex_unlock(&acpi_device_lock);
377 return 0;
380 static void physical_device_enable_wakeup(struct acpi_device *adev)
382 struct device *dev = acpi_get_physical_device(adev->handle);
384 if (dev && device_can_wakeup(dev))
385 device_set_wakeup_enable(dev, adev->wakeup.state.enabled);
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)
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;
399 if (len > 4)
400 len = 4;
402 if (copy_from_user(strbuf, buffer, len))
403 return -EFAULT;
404 strbuf[len] = '\0';
405 sscanf(strbuf, "%s", str);
407 mutex_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;
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;
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);
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);
444 mutex_unlock(&acpi_device_lock);
445 return count;
448 static int
449 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
451 return single_open(file, acpi_system_wakeup_device_seq_show,
452 PDE(inode)->data);
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,
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,
473 #endif /* CONFIG_ACPI_PROCFS */
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,
485 static u32 rtc_handler(void *context)
487 acpi_clear_event(ACPI_EVENT_RTC);
488 acpi_disable_event(ACPI_EVENT_RTC, 0);
490 return ACPI_INTERRUPT_HANDLED;
492 #endif /* HAVE_ACPI_LEGACY_ALARM */
494 int __init acpi_sleep_proc_init(void)
496 #ifdef CONFIG_ACPI_PROCFS
497 /* 'sleep' [R/W] */
498 proc_create("sleep", S_IFREG | S_IRUGO | S_IWUSR,
499 acpi_root_dir, &acpi_system_sleep_fops);
500 #endif /* CONFIG_ACPI_PROCFS */
502 #ifdef HAVE_ACPI_LEGACY_ALARM
503 /* 'alarm' [R/W] */
504 proc_create("alarm", S_IFREG | S_IRUGO | S_IWUSR,
505 acpi_root_dir, &acpi_system_alarm_fops);
507 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
509 * Disable the RTC event after installing RTC handler.
510 * Only when RTC alarm is set will it be enabled.
512 acpi_clear_event(ACPI_EVENT_RTC);
513 acpi_disable_event(ACPI_EVENT_RTC, 0);
514 #endif /* HAVE_ACPI_LEGACY_ALARM */
516 /* 'wakeup device' [R/W] */
517 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
518 acpi_root_dir, &acpi_system_wakeup_device_fops);
520 return 0;