1 #include <linux/proc_fs.h>
2 #include <linux/seq_file.h>
3 #include <linux/suspend.h>
5 #include <asm/uaccess.h>
7 #include <acpi/acpi_bus.h>
8 #include <acpi/acpi_drivers.h>
11 #include <linux/mc146818rtc.h>
16 #define _COMPONENT ACPI_SYSTEM_COMPONENT
17 ACPI_MODULE_NAME("sleep")
18 #ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
19 static int acpi_system_sleep_seq_show(struct seq_file
*seq
, void *offset
)
23 ACPI_FUNCTION_TRACE("acpi_system_sleep_seq_show");
25 for (i
= 0; i
<= ACPI_STATE_S5
; i
++) {
26 if (sleep_states
[i
]) {
27 seq_printf(seq
, "S%d ", i
);
36 static int acpi_system_sleep_open_fs(struct inode
*inode
, struct file
*file
)
38 return single_open(file
, acpi_system_sleep_seq_show
, PDE(inode
)->data
);
42 acpi_system_write_sleep(struct file
*file
,
43 const char __user
* buffer
, size_t count
, loff_t
* ppos
)
49 if (count
> sizeof(str
) - 1)
51 memset(str
, 0, sizeof(str
));
52 if (copy_from_user(str
, buffer
, count
))
55 /* Check for S4 bios request */
56 if (!strcmp(str
, "4b")) {
57 error
= acpi_suspend(4);
60 state
= simple_strtoul(str
, NULL
, 0);
61 #ifdef CONFIG_SOFTWARE_SUSPEND
67 error
= acpi_suspend(state
);
69 return error
? error
: count
;
71 #endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
73 #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
74 /* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
76 #define HAVE_ACPI_LEGACY_ALARM
79 #ifdef HAVE_ACPI_LEGACY_ALARM
81 static int acpi_system_alarm_seq_show(struct seq_file
*seq
, void *offset
)
84 u32 day
, mo
, yr
, cent
= 0;
85 unsigned char rtc_control
= 0;
88 ACPI_FUNCTION_TRACE("acpi_system_alarm_seq_show");
90 spin_lock_irqsave(&rtc_lock
, flags
);
92 sec
= CMOS_READ(RTC_SECONDS_ALARM
);
93 min
= CMOS_READ(RTC_MINUTES_ALARM
);
94 hr
= CMOS_READ(RTC_HOURS_ALARM
);
95 rtc_control
= CMOS_READ(RTC_CONTROL
);
97 /* If we ever get an FACP with proper values... */
98 if (acpi_gbl_FADT
.day_alarm
)
99 /* ACPI spec: only low 6 its should be cared */
100 day
= CMOS_READ(acpi_gbl_FADT
.day_alarm
) & 0x3F;
102 day
= CMOS_READ(RTC_DAY_OF_MONTH
);
103 if (acpi_gbl_FADT
.month_alarm
)
104 mo
= CMOS_READ(acpi_gbl_FADT
.month_alarm
);
106 mo
= CMOS_READ(RTC_MONTH
);
107 if (acpi_gbl_FADT
.century
)
108 cent
= CMOS_READ(acpi_gbl_FADT
.century
);
110 yr
= CMOS_READ(RTC_YEAR
);
112 spin_unlock_irqrestore(&rtc_lock
, flags
);
114 if (!(rtc_control
& RTC_DM_BINARY
) || RTC_ALWAYS_BCD
) {
124 /* we're trusting the FADT (see above) */
125 if (!acpi_gbl_FADT
.century
)
126 /* If we're not trusting the FADT, we should at least make it
127 * right for _this_ century... ehm, what is _this_ century?
130 * ASAP: find piece of code in the kernel, e.g. star tracker driver,
131 * which we can trust to determine the century correctly. Atom
132 * watch driver would be nice, too...
134 * if that has not happened, change for first release in 2050:
138 * yr += 2000; // current line of code
140 * if that has not happened either, please do on 2099/12/31:23:59:59
148 seq_printf(seq
, "%4.4u-", yr
);
149 (mo
> 12) ? seq_puts(seq
, "**-") : seq_printf(seq
, "%2.2u-", mo
);
150 (day
> 31) ? seq_puts(seq
, "** ") : seq_printf(seq
, "%2.2u ", day
);
151 (hr
> 23) ? seq_puts(seq
, "**:") : seq_printf(seq
, "%2.2u:", hr
);
152 (min
> 59) ? seq_puts(seq
, "**:") : seq_printf(seq
, "%2.2u:", min
);
153 (sec
> 59) ? seq_puts(seq
, "**\n") : seq_printf(seq
, "%2.2u\n", sec
);
158 static int acpi_system_alarm_open_fs(struct inode
*inode
, struct file
*file
)
160 return single_open(file
, acpi_system_alarm_seq_show
, PDE(inode
)->data
);
163 static int get_date_field(char **p
, u32
* value
)
166 char *string_end
= NULL
;
167 int result
= -EINVAL
;
170 * Try to find delimeter, only to insert null. The end of the
171 * string won't have one, but is still valid.
173 next
= strpbrk(*p
, "- :");
177 *value
= simple_strtoul(*p
, &string_end
, 10);
179 /* Signal success if we got a good digit */
180 if (string_end
!= *p
)
190 acpi_system_write_alarm(struct file
*file
,
191 const char __user
* buffer
, size_t count
, loff_t
* ppos
)
194 char alarm_string
[30] = { '\0' };
195 char *p
= alarm_string
;
196 u32 sec
, min
, hr
, day
, mo
, yr
;
198 unsigned char rtc_control
= 0;
200 ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
202 if (count
> sizeof(alarm_string
) - 1)
203 return_VALUE(-EINVAL
);
205 if (copy_from_user(alarm_string
, buffer
, count
))
206 return_VALUE(-EFAULT
);
208 alarm_string
[count
] = '\0';
210 /* check for time adjustment */
211 if (alarm_string
[0] == '+') {
216 if ((result
= get_date_field(&p
, &yr
)))
218 if ((result
= get_date_field(&p
, &mo
)))
220 if ((result
= get_date_field(&p
, &day
)))
222 if ((result
= get_date_field(&p
, &hr
)))
224 if ((result
= get_date_field(&p
, &min
)))
226 if ((result
= get_date_field(&p
, &sec
)))
250 spin_lock_irq(&rtc_lock
);
252 rtc_control
= CMOS_READ(RTC_CONTROL
);
253 if (!(rtc_control
& RTC_DM_BINARY
) || RTC_ALWAYS_BCD
) {
263 yr
+= CMOS_READ(RTC_YEAR
);
264 mo
+= CMOS_READ(RTC_MONTH
);
265 day
+= CMOS_READ(RTC_DAY_OF_MONTH
);
266 hr
+= CMOS_READ(RTC_HOURS
);
267 min
+= CMOS_READ(RTC_MINUTES
);
268 sec
+= CMOS_READ(RTC_SECONDS
);
271 spin_unlock_irq(&rtc_lock
);
273 if (!(rtc_control
& RTC_DM_BINARY
) || RTC_ALWAYS_BCD
) {
302 if (!(rtc_control
& RTC_DM_BINARY
) || RTC_ALWAYS_BCD
) {
311 spin_lock_irq(&rtc_lock
);
313 * Disable alarm interrupt before setting alarm timer or else
314 * when ACPI_EVENT_RTC is enabled, a spurious ACPI interrupt occurs
316 rtc_control
&= ~RTC_AIE
;
317 CMOS_WRITE(rtc_control
, RTC_CONTROL
);
318 CMOS_READ(RTC_INTR_FLAGS
);
320 /* write the fields the rtc knows about */
321 CMOS_WRITE(hr
, RTC_HOURS_ALARM
);
322 CMOS_WRITE(min
, RTC_MINUTES_ALARM
);
323 CMOS_WRITE(sec
, RTC_SECONDS_ALARM
);
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.
330 if (acpi_gbl_FADT
.day_alarm
)
331 CMOS_WRITE(day
, acpi_gbl_FADT
.day_alarm
);
332 if (acpi_gbl_FADT
.month_alarm
)
333 CMOS_WRITE(mo
, acpi_gbl_FADT
.month_alarm
);
334 if (acpi_gbl_FADT
.century
)
335 CMOS_WRITE(yr
/ 100, acpi_gbl_FADT
.century
);
336 /* enable the rtc alarm interrupt */
337 rtc_control
|= RTC_AIE
;
338 CMOS_WRITE(rtc_control
, RTC_CONTROL
);
339 CMOS_READ(RTC_INTR_FLAGS
);
341 spin_unlock_irq(&rtc_lock
);
343 acpi_clear_event(ACPI_EVENT_RTC
);
344 acpi_enable_event(ACPI_EVENT_RTC
, 0);
350 return_VALUE(result
? result
: count
);
352 #endif /* HAVE_ACPI_LEGACY_ALARM */
355 extern struct list_head acpi_wakeup_device_list
;
356 extern spinlock_t acpi_device_lock
;
359 acpi_system_wakeup_device_seq_show(struct seq_file
*seq
, void *offset
)
361 struct list_head
*node
, *next
;
363 seq_printf(seq
, "Device\tS-state\t Status Sysfs node\n");
365 spin_lock(&acpi_device_lock
);
366 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
367 struct acpi_device
*dev
=
368 container_of(node
, struct acpi_device
, wakeup_list
);
371 if (!dev
->wakeup
.flags
.valid
)
373 spin_unlock(&acpi_device_lock
);
375 ldev
= acpi_get_physical_device(dev
->handle
);
376 seq_printf(seq
, "%s\t S%d\t%c%-8s ",
378 (u32
) dev
->wakeup
.sleep_state
,
379 dev
->wakeup
.flags
.run_wake
? '*' : ' ',
380 dev
->wakeup
.state
.enabled
? "enabled" : "disabled");
382 seq_printf(seq
, "%s:%s",
383 ldev
->bus
? ldev
->bus
->name
: "no-bus",
385 seq_printf(seq
, "\n");
388 spin_lock(&acpi_device_lock
);
390 spin_unlock(&acpi_device_lock
);
395 acpi_system_write_wakeup_device(struct file
*file
,
396 const char __user
* buffer
,
397 size_t count
, loff_t
* ppos
)
399 struct list_head
*node
, *next
;
403 struct acpi_device
*found_dev
= NULL
;
408 if (copy_from_user(strbuf
, buffer
, len
))
411 sscanf(strbuf
, "%s", str
);
413 spin_lock(&acpi_device_lock
);
414 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
415 struct acpi_device
*dev
=
416 container_of(node
, struct acpi_device
, wakeup_list
);
417 if (!dev
->wakeup
.flags
.valid
)
420 if (!strncmp(dev
->pnp
.bus_id
, str
, 4)) {
421 dev
->wakeup
.state
.enabled
=
422 dev
->wakeup
.state
.enabled
? 0 : 1;
428 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
429 struct acpi_device
*dev
= container_of(node
,
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
)) {
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
;
448 spin_unlock(&acpi_device_lock
);
453 acpi_system_wakeup_device_open_fs(struct inode
*inode
, struct file
*file
)
455 return single_open(file
, acpi_system_wakeup_device_seq_show
,
459 static const struct file_operations acpi_system_wakeup_device_fops
= {
460 .open
= acpi_system_wakeup_device_open_fs
,
462 .write
= acpi_system_write_wakeup_device
,
464 .release
= single_release
,
467 #ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
468 static const struct file_operations acpi_system_sleep_fops
= {
469 .open
= acpi_system_sleep_open_fs
,
471 .write
= acpi_system_write_sleep
,
473 .release
= single_release
,
475 #endif /* CONFIG_ACPI_SLEEP_PROC_SLEEP */
477 #ifdef HAVE_ACPI_LEGACY_ALARM
478 static const struct file_operations acpi_system_alarm_fops
= {
479 .open
= acpi_system_alarm_open_fs
,
481 .write
= acpi_system_write_alarm
,
483 .release
= single_release
,
486 static u32
rtc_handler(void *context
)
488 acpi_clear_event(ACPI_EVENT_RTC
);
489 acpi_disable_event(ACPI_EVENT_RTC
, 0);
491 return ACPI_INTERRUPT_HANDLED
;
493 #endif /* HAVE_ACPI_LEGACY_ALARM */
495 static int __init
acpi_sleep_proc_init(void)
497 struct proc_dir_entry
*entry
= NULL
;
502 #ifdef CONFIG_ACPI_SLEEP_PROC_SLEEP
505 create_proc_entry("sleep", S_IFREG
| S_IRUGO
| S_IWUSR
,
508 entry
->proc_fops
= &acpi_system_sleep_fops
;
511 #ifdef HAVE_ACPI_LEGACY_ALARM
514 create_proc_entry("alarm", S_IFREG
| S_IRUGO
| S_IWUSR
,
517 entry
->proc_fops
= &acpi_system_alarm_fops
;
519 acpi_install_fixed_event_handler(ACPI_EVENT_RTC
, rtc_handler
, NULL
);
520 #endif /* HAVE_ACPI_LEGACY_ALARM */
522 /* 'wakeup device' [R/W] */
524 create_proc_entry("wakeup", S_IFREG
| S_IRUGO
| S_IWUSR
,
527 entry
->proc_fops
= &acpi_system_wakeup_device_fops
;
532 late_initcall(acpi_sleep_proc_init
);