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7726942f RB |
1 | /* |
2 | * bios-less APM driver for ARM Linux | |
3 | * Jamey Hicks <jamey@crl.dec.com> | |
4 | * adapted from the APM BIOS driver for Linux by Stephen Rothwell (sfr@linuxcare.com) | |
5 | * | |
6 | * APM 1.2 Reference: | |
7 | * Intel Corporation, Microsoft Corporation. Advanced Power Management | |
8 | * (APM) BIOS Interface Specification, Revision 1.2, February 1996. | |
9 | * | |
10 | * [This document is available from Microsoft at: | |
11 | * http://www.microsoft.com/hwdev/busbios/amp_12.htm] | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/poll.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/miscdevice.h> | |
18 | #include <linux/apm_bios.h> | |
19 | #include <linux/capability.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/pm.h> | |
22 | #include <linux/apm-emulation.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/completion.h> | |
28 | #include <linux/kthread.h> | |
29 | #include <linux/delay.h> | |
30 | ||
31 | #include <asm/system.h> | |
32 | ||
33 | /* | |
34 | * The apm_bios device is one of the misc char devices. | |
35 | * This is its minor number. | |
36 | */ | |
37 | #define APM_MINOR_DEV 134 | |
38 | ||
39 | /* | |
40 | * See Documentation/Config.help for the configuration options. | |
41 | * | |
42 | * Various options can be changed at boot time as follows: | |
43 | * (We allow underscores for compatibility with the modules code) | |
44 | * apm=on/off enable/disable APM | |
45 | */ | |
46 | ||
47 | /* | |
48 | * Maximum number of events stored | |
49 | */ | |
50 | #define APM_MAX_EVENTS 16 | |
51 | ||
52 | struct apm_queue { | |
53 | unsigned int event_head; | |
54 | unsigned int event_tail; | |
55 | apm_event_t events[APM_MAX_EVENTS]; | |
56 | }; | |
57 | ||
58 | /* | |
59 | * The per-file APM data | |
60 | */ | |
61 | struct apm_user { | |
62 | struct list_head list; | |
63 | ||
64 | unsigned int suser: 1; | |
65 | unsigned int writer: 1; | |
66 | unsigned int reader: 1; | |
67 | ||
68 | int suspend_result; | |
69 | unsigned int suspend_state; | |
70 | #define SUSPEND_NONE 0 /* no suspend pending */ | |
71 | #define SUSPEND_PENDING 1 /* suspend pending read */ | |
72 | #define SUSPEND_READ 2 /* suspend read, pending ack */ | |
73 | #define SUSPEND_ACKED 3 /* suspend acked */ | |
74 | #define SUSPEND_WAIT 4 /* waiting for suspend */ | |
75 | #define SUSPEND_DONE 5 /* suspend completed */ | |
76 | ||
77 | struct apm_queue queue; | |
78 | }; | |
79 | ||
80 | /* | |
81 | * Local variables | |
82 | */ | |
83 | static int suspends_pending; | |
84 | static int apm_disabled; | |
85 | static struct task_struct *kapmd_tsk; | |
86 | ||
87 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); | |
88 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); | |
89 | ||
90 | /* | |
91 | * This is a list of everyone who has opened /dev/apm_bios | |
92 | */ | |
93 | static DECLARE_RWSEM(user_list_lock); | |
94 | static LIST_HEAD(apm_user_list); | |
95 | ||
96 | /* | |
97 | * kapmd info. kapmd provides us a process context to handle | |
98 | * "APM" events within - specifically necessary if we're going | |
99 | * to be suspending the system. | |
100 | */ | |
101 | static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait); | |
102 | static DEFINE_SPINLOCK(kapmd_queue_lock); | |
103 | static struct apm_queue kapmd_queue; | |
104 | ||
105 | static DEFINE_MUTEX(state_lock); | |
106 | ||
107 | static const char driver_version[] = "1.13"; /* no spaces */ | |
108 | ||
109 | ||
110 | ||
111 | /* | |
112 | * Compatibility cruft until the IPAQ people move over to the new | |
113 | * interface. | |
114 | */ | |
115 | static void __apm_get_power_status(struct apm_power_info *info) | |
116 | { | |
117 | } | |
118 | ||
119 | /* | |
120 | * This allows machines to provide their own "apm get power status" function. | |
121 | */ | |
122 | void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status; | |
123 | EXPORT_SYMBOL(apm_get_power_status); | |
124 | ||
125 | ||
126 | /* | |
127 | * APM event queue management. | |
128 | */ | |
129 | static inline int queue_empty(struct apm_queue *q) | |
130 | { | |
131 | return q->event_head == q->event_tail; | |
132 | } | |
133 | ||
134 | static inline apm_event_t queue_get_event(struct apm_queue *q) | |
135 | { | |
136 | q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS; | |
137 | return q->events[q->event_tail]; | |
138 | } | |
139 | ||
140 | static void queue_add_event(struct apm_queue *q, apm_event_t event) | |
141 | { | |
142 | q->event_head = (q->event_head + 1) % APM_MAX_EVENTS; | |
143 | if (q->event_head == q->event_tail) { | |
144 | static int notified; | |
145 | ||
146 | if (notified++ == 0) | |
147 | printk(KERN_ERR "apm: an event queue overflowed\n"); | |
148 | q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS; | |
149 | } | |
150 | q->events[q->event_head] = event; | |
151 | } | |
152 | ||
153 | static void queue_event(apm_event_t event) | |
154 | { | |
155 | struct apm_user *as; | |
156 | ||
157 | down_read(&user_list_lock); | |
158 | list_for_each_entry(as, &apm_user_list, list) { | |
159 | if (as->reader) | |
160 | queue_add_event(&as->queue, event); | |
161 | } | |
162 | up_read(&user_list_lock); | |
163 | wake_up_interruptible(&apm_waitqueue); | |
164 | } | |
165 | ||
166 | /* | |
167 | * queue_suspend_event - queue an APM suspend event. | |
168 | * | |
169 | * Check that we're in a state where we can suspend. If not, | |
170 | * return -EBUSY. Otherwise, queue an event to all "writer" | |
171 | * users. If there are no "writer" users, return '1' to | |
172 | * indicate that we can immediately suspend. | |
173 | */ | |
174 | static int queue_suspend_event(apm_event_t event, struct apm_user *sender) | |
175 | { | |
176 | struct apm_user *as; | |
177 | int ret = 1; | |
178 | ||
179 | mutex_lock(&state_lock); | |
180 | down_read(&user_list_lock); | |
181 | ||
182 | /* | |
183 | * If a thread is still processing, we can't suspend, so reject | |
184 | * the request. | |
185 | */ | |
186 | list_for_each_entry(as, &apm_user_list, list) { | |
187 | if (as != sender && as->reader && as->writer && as->suser && | |
188 | as->suspend_state != SUSPEND_NONE) { | |
189 | ret = -EBUSY; | |
190 | goto out; | |
191 | } | |
192 | } | |
193 | ||
194 | list_for_each_entry(as, &apm_user_list, list) { | |
195 | if (as != sender && as->reader && as->writer && as->suser) { | |
196 | as->suspend_state = SUSPEND_PENDING; | |
197 | suspends_pending++; | |
198 | queue_add_event(&as->queue, event); | |
199 | ret = 0; | |
200 | } | |
201 | } | |
202 | out: | |
203 | up_read(&user_list_lock); | |
204 | mutex_unlock(&state_lock); | |
205 | wake_up_interruptible(&apm_waitqueue); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | static void apm_suspend(void) | |
210 | { | |
211 | struct apm_user *as; | |
212 | int err = pm_suspend(PM_SUSPEND_MEM); | |
213 | ||
214 | /* | |
215 | * Anyone on the APM queues will think we're still suspended. | |
216 | * Send a message so everyone knows we're now awake again. | |
217 | */ | |
218 | queue_event(APM_NORMAL_RESUME); | |
219 | ||
220 | /* | |
221 | * Finally, wake up anyone who is sleeping on the suspend. | |
222 | */ | |
223 | mutex_lock(&state_lock); | |
224 | down_read(&user_list_lock); | |
225 | list_for_each_entry(as, &apm_user_list, list) { | |
226 | if (as->suspend_state == SUSPEND_WAIT || | |
227 | as->suspend_state == SUSPEND_ACKED) { | |
228 | as->suspend_result = err; | |
229 | as->suspend_state = SUSPEND_DONE; | |
230 | } | |
231 | } | |
232 | up_read(&user_list_lock); | |
233 | mutex_unlock(&state_lock); | |
234 | ||
235 | wake_up(&apm_suspend_waitqueue); | |
236 | } | |
237 | ||
238 | static ssize_t apm_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) | |
239 | { | |
240 | struct apm_user *as = fp->private_data; | |
241 | apm_event_t event; | |
242 | int i = count, ret = 0; | |
243 | ||
244 | if (count < sizeof(apm_event_t)) | |
245 | return -EINVAL; | |
246 | ||
247 | if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK) | |
248 | return -EAGAIN; | |
249 | ||
250 | wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue)); | |
251 | ||
252 | while ((i >= sizeof(event)) && !queue_empty(&as->queue)) { | |
253 | event = queue_get_event(&as->queue); | |
254 | ||
255 | ret = -EFAULT; | |
256 | if (copy_to_user(buf, &event, sizeof(event))) | |
257 | break; | |
258 | ||
259 | mutex_lock(&state_lock); | |
260 | if (as->suspend_state == SUSPEND_PENDING && | |
261 | (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)) | |
262 | as->suspend_state = SUSPEND_READ; | |
263 | mutex_unlock(&state_lock); | |
264 | ||
265 | buf += sizeof(event); | |
266 | i -= sizeof(event); | |
267 | } | |
268 | ||
269 | if (i < count) | |
270 | ret = count - i; | |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | static unsigned int apm_poll(struct file *fp, poll_table * wait) | |
276 | { | |
277 | struct apm_user *as = fp->private_data; | |
278 | ||
279 | poll_wait(fp, &apm_waitqueue, wait); | |
280 | return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM; | |
281 | } | |
282 | ||
283 | /* | |
284 | * apm_ioctl - handle APM ioctl | |
285 | * | |
286 | * APM_IOC_SUSPEND | |
287 | * This IOCTL is overloaded, and performs two functions. It is used to: | |
288 | * - initiate a suspend | |
289 | * - acknowledge a suspend read from /dev/apm_bios. | |
290 | * Only when everyone who has opened /dev/apm_bios with write permission | |
291 | * has acknowledge does the actual suspend happen. | |
292 | */ | |
293 | static int | |
294 | apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg) | |
295 | { | |
296 | struct apm_user *as = filp->private_data; | |
297 | unsigned long flags; | |
298 | int err = -EINVAL; | |
299 | ||
300 | if (!as->suser || !as->writer) | |
301 | return -EPERM; | |
302 | ||
303 | switch (cmd) { | |
304 | case APM_IOC_SUSPEND: | |
305 | mutex_lock(&state_lock); | |
306 | ||
307 | as->suspend_result = -EINTR; | |
308 | ||
309 | if (as->suspend_state == SUSPEND_READ) { | |
310 | int pending; | |
311 | ||
312 | /* | |
313 | * If we read a suspend command from /dev/apm_bios, | |
314 | * then the corresponding APM_IOC_SUSPEND ioctl is | |
315 | * interpreted as an acknowledge. | |
316 | */ | |
317 | as->suspend_state = SUSPEND_ACKED; | |
318 | suspends_pending--; | |
319 | pending = suspends_pending == 0; | |
320 | mutex_unlock(&state_lock); | |
321 | ||
322 | /* | |
323 | * If there are no further acknowledges required, | |
324 | * suspend the system. | |
325 | */ | |
326 | if (pending) | |
327 | apm_suspend(); | |
328 | ||
329 | /* | |
330 | * Wait for the suspend/resume to complete. If there | |
331 | * are pending acknowledges, we wait here for them. | |
332 | * | |
333 | * Note: we need to ensure that the PM subsystem does | |
334 | * not kick us out of the wait when it suspends the | |
335 | * threads. | |
336 | */ | |
337 | flags = current->flags; | |
338 | current->flags |= PF_NOFREEZE; | |
339 | ||
340 | wait_event(apm_suspend_waitqueue, | |
341 | as->suspend_state == SUSPEND_DONE); | |
342 | } else { | |
343 | as->suspend_state = SUSPEND_WAIT; | |
344 | mutex_unlock(&state_lock); | |
345 | ||
346 | /* | |
347 | * Otherwise it is a request to suspend the system. | |
348 | * Queue an event for all readers, and expect an | |
349 | * acknowledge from all writers who haven't already | |
350 | * acknowledged. | |
351 | */ | |
352 | err = queue_suspend_event(APM_USER_SUSPEND, as); | |
353 | if (err < 0) { | |
354 | /* | |
355 | * Avoid taking the lock here - this | |
356 | * should be fine. | |
357 | */ | |
358 | as->suspend_state = SUSPEND_NONE; | |
359 | break; | |
360 | } | |
361 | ||
362 | if (err > 0) | |
363 | apm_suspend(); | |
364 | ||
365 | /* | |
366 | * Wait for the suspend/resume to complete. If there | |
367 | * are pending acknowledges, we wait here for them. | |
368 | * | |
369 | * Note: we need to ensure that the PM subsystem does | |
370 | * not kick us out of the wait when it suspends the | |
371 | * threads. | |
372 | */ | |
373 | flags = current->flags; | |
374 | current->flags |= PF_NOFREEZE; | |
375 | ||
376 | wait_event_interruptible(apm_suspend_waitqueue, | |
377 | as->suspend_state == SUSPEND_DONE); | |
378 | } | |
379 | ||
380 | current->flags = flags; | |
381 | ||
382 | mutex_lock(&state_lock); | |
383 | err = as->suspend_result; | |
384 | as->suspend_state = SUSPEND_NONE; | |
385 | mutex_unlock(&state_lock); | |
386 | break; | |
387 | } | |
388 | ||
389 | return err; | |
390 | } | |
391 | ||
392 | static int apm_release(struct inode * inode, struct file * filp) | |
393 | { | |
394 | struct apm_user *as = filp->private_data; | |
395 | int pending = 0; | |
396 | ||
397 | filp->private_data = NULL; | |
398 | ||
399 | down_write(&user_list_lock); | |
400 | list_del(&as->list); | |
401 | up_write(&user_list_lock); | |
402 | ||
403 | /* | |
404 | * We are now unhooked from the chain. As far as new | |
405 | * events are concerned, we no longer exist. However, we | |
406 | * need to balance suspends_pending, which means the | |
407 | * possibility of sleeping. | |
408 | */ | |
409 | mutex_lock(&state_lock); | |
410 | if (as->suspend_state != SUSPEND_NONE) { | |
411 | suspends_pending -= 1; | |
412 | pending = suspends_pending == 0; | |
413 | } | |
414 | mutex_unlock(&state_lock); | |
415 | if (pending) | |
416 | apm_suspend(); | |
417 | ||
418 | kfree(as); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int apm_open(struct inode * inode, struct file * filp) | |
423 | { | |
424 | struct apm_user *as; | |
425 | ||
426 | as = kzalloc(sizeof(*as), GFP_KERNEL); | |
427 | if (as) { | |
428 | /* | |
429 | * XXX - this is a tiny bit broken, when we consider BSD | |
430 | * process accounting. If the device is opened by root, we | |
431 | * instantly flag that we used superuser privs. Who knows, | |
432 | * we might close the device immediately without doing a | |
433 | * privileged operation -- cevans | |
434 | */ | |
435 | as->suser = capable(CAP_SYS_ADMIN); | |
436 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; | |
437 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; | |
438 | ||
439 | down_write(&user_list_lock); | |
440 | list_add(&as->list, &apm_user_list); | |
441 | up_write(&user_list_lock); | |
442 | ||
443 | filp->private_data = as; | |
444 | } | |
445 | ||
446 | return as ? 0 : -ENOMEM; | |
447 | } | |
448 | ||
449 | static struct file_operations apm_bios_fops = { | |
450 | .owner = THIS_MODULE, | |
451 | .read = apm_read, | |
452 | .poll = apm_poll, | |
453 | .ioctl = apm_ioctl, | |
454 | .open = apm_open, | |
455 | .release = apm_release, | |
456 | }; | |
457 | ||
458 | static struct miscdevice apm_device = { | |
459 | .minor = APM_MINOR_DEV, | |
460 | .name = "apm_bios", | |
461 | .fops = &apm_bios_fops | |
462 | }; | |
463 | ||
464 | ||
465 | #ifdef CONFIG_PROC_FS | |
466 | /* | |
467 | * Arguments, with symbols from linux/apm_bios.h. | |
468 | * | |
469 | * 0) Linux driver version (this will change if format changes) | |
470 | * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. | |
471 | * 2) APM flags from APM Installation Check (0x00): | |
472 | * bit 0: APM_16_BIT_SUPPORT | |
473 | * bit 1: APM_32_BIT_SUPPORT | |
474 | * bit 2: APM_IDLE_SLOWS_CLOCK | |
475 | * bit 3: APM_BIOS_DISABLED | |
476 | * bit 4: APM_BIOS_DISENGAGED | |
477 | * 3) AC line status | |
478 | * 0x00: Off-line | |
479 | * 0x01: On-line | |
480 | * 0x02: On backup power (BIOS >= 1.1 only) | |
481 | * 0xff: Unknown | |
482 | * 4) Battery status | |
483 | * 0x00: High | |
484 | * 0x01: Low | |
485 | * 0x02: Critical | |
486 | * 0x03: Charging | |
487 | * 0x04: Selected battery not present (BIOS >= 1.2 only) | |
488 | * 0xff: Unknown | |
489 | * 5) Battery flag | |
490 | * bit 0: High | |
491 | * bit 1: Low | |
492 | * bit 2: Critical | |
493 | * bit 3: Charging | |
494 | * bit 7: No system battery | |
495 | * 0xff: Unknown | |
496 | * 6) Remaining battery life (percentage of charge): | |
497 | * 0-100: valid | |
498 | * -1: Unknown | |
499 | * 7) Remaining battery life (time units): | |
500 | * Number of remaining minutes or seconds | |
501 | * -1: Unknown | |
502 | * 8) min = minutes; sec = seconds | |
503 | */ | |
504 | static int apm_get_info(char *buf, char **start, off_t fpos, int length) | |
505 | { | |
506 | struct apm_power_info info; | |
507 | char *units; | |
508 | int ret; | |
509 | ||
510 | info.ac_line_status = 0xff; | |
511 | info.battery_status = 0xff; | |
512 | info.battery_flag = 0xff; | |
513 | info.battery_life = -1; | |
514 | info.time = -1; | |
515 | info.units = -1; | |
516 | ||
517 | if (apm_get_power_status) | |
518 | apm_get_power_status(&info); | |
519 | ||
520 | switch (info.units) { | |
521 | default: units = "?"; break; | |
522 | case 0: units = "min"; break; | |
523 | case 1: units = "sec"; break; | |
524 | } | |
525 | ||
526 | ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", | |
527 | driver_version, APM_32_BIT_SUPPORT, | |
528 | info.ac_line_status, info.battery_status, | |
529 | info.battery_flag, info.battery_life, | |
530 | info.time, units); | |
531 | ||
532 | return ret; | |
533 | } | |
534 | #endif | |
535 | ||
536 | static int kapmd(void *arg) | |
537 | { | |
538 | do { | |
539 | apm_event_t event; | |
540 | int ret; | |
541 | ||
542 | wait_event_interruptible(kapmd_wait, | |
543 | !queue_empty(&kapmd_queue) || kthread_should_stop()); | |
544 | ||
545 | if (kthread_should_stop()) | |
546 | break; | |
547 | ||
548 | spin_lock_irq(&kapmd_queue_lock); | |
549 | event = 0; | |
550 | if (!queue_empty(&kapmd_queue)) | |
551 | event = queue_get_event(&kapmd_queue); | |
552 | spin_unlock_irq(&kapmd_queue_lock); | |
553 | ||
554 | switch (event) { | |
555 | case 0: | |
556 | break; | |
557 | ||
558 | case APM_LOW_BATTERY: | |
559 | case APM_POWER_STATUS_CHANGE: | |
560 | queue_event(event); | |
561 | break; | |
562 | ||
563 | case APM_USER_SUSPEND: | |
564 | case APM_SYS_SUSPEND: | |
565 | ret = queue_suspend_event(event, NULL); | |
566 | if (ret < 0) { | |
567 | /* | |
568 | * We were busy. Try again in 50ms. | |
569 | */ | |
570 | queue_add_event(&kapmd_queue, event); | |
571 | msleep(50); | |
572 | } | |
573 | if (ret > 0) | |
574 | apm_suspend(); | |
575 | break; | |
576 | ||
577 | case APM_CRITICAL_SUSPEND: | |
578 | apm_suspend(); | |
579 | break; | |
580 | } | |
581 | } while (1); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static int __init apm_init(void) | |
587 | { | |
588 | int ret; | |
589 | ||
590 | if (apm_disabled) { | |
591 | printk(KERN_NOTICE "apm: disabled on user request.\n"); | |
592 | return -ENODEV; | |
593 | } | |
594 | ||
595 | kapmd_tsk = kthread_create(kapmd, NULL, "kapmd"); | |
596 | if (IS_ERR(kapmd_tsk)) { | |
597 | ret = PTR_ERR(kapmd_tsk); | |
598 | kapmd_tsk = NULL; | |
599 | return ret; | |
600 | } | |
601 | kapmd_tsk->flags |= PF_NOFREEZE; | |
602 | wake_up_process(kapmd_tsk); | |
603 | ||
604 | #ifdef CONFIG_PROC_FS | |
605 | create_proc_info_entry("apm", 0, NULL, apm_get_info); | |
606 | #endif | |
607 | ||
608 | ret = misc_register(&apm_device); | |
609 | if (ret != 0) { | |
610 | remove_proc_entry("apm", NULL); | |
611 | kthread_stop(kapmd_tsk); | |
612 | } | |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
617 | static void __exit apm_exit(void) | |
618 | { | |
619 | misc_deregister(&apm_device); | |
620 | remove_proc_entry("apm", NULL); | |
621 | ||
622 | kthread_stop(kapmd_tsk); | |
623 | } | |
624 | ||
625 | module_init(apm_init); | |
626 | module_exit(apm_exit); | |
627 | ||
628 | MODULE_AUTHOR("Stephen Rothwell"); | |
629 | MODULE_DESCRIPTION("Advanced Power Management"); | |
630 | MODULE_LICENSE("GPL"); | |
631 | ||
632 | #ifndef MODULE | |
633 | static int __init apm_setup(char *str) | |
634 | { | |
635 | while ((str != NULL) && (*str != '\0')) { | |
636 | if (strncmp(str, "off", 3) == 0) | |
637 | apm_disabled = 1; | |
638 | if (strncmp(str, "on", 2) == 0) | |
639 | apm_disabled = 0; | |
640 | str = strchr(str, ','); | |
641 | if (str != NULL) | |
642 | str += strspn(str, ", \t"); | |
643 | } | |
644 | return 1; | |
645 | } | |
646 | ||
647 | __setup("apm=", apm_setup); | |
648 | #endif | |
649 | ||
650 | /** | |
651 | * apm_queue_event - queue an APM event for kapmd | |
652 | * @event: APM event | |
653 | * | |
654 | * Queue an APM event for kapmd to process and ultimately take the | |
655 | * appropriate action. Only a subset of events are handled: | |
656 | * %APM_LOW_BATTERY | |
657 | * %APM_POWER_STATUS_CHANGE | |
658 | * %APM_USER_SUSPEND | |
659 | * %APM_SYS_SUSPEND | |
660 | * %APM_CRITICAL_SUSPEND | |
661 | */ | |
662 | void apm_queue_event(apm_event_t event) | |
663 | { | |
664 | unsigned long flags; | |
665 | ||
666 | spin_lock_irqsave(&kapmd_queue_lock, flags); | |
667 | queue_add_event(&kapmd_queue, event); | |
668 | spin_unlock_irqrestore(&kapmd_queue_lock, flags); | |
669 | ||
670 | wake_up_interruptible(&kapmd_wait); | |
671 | } | |
672 | EXPORT_SYMBOL(apm_queue_event); |