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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/whdc/archive/amp_12.mspx |
12 | */ |
13 | #include <linux/module.h> |
14 | #include <linux/poll.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/mutex.h> |
17 | #include <linux/proc_fs.h> |
18 | #include <linux/seq_file.h> |
19 | #include <linux/miscdevice.h> |
20 | #include <linux/apm_bios.h> |
21 | #include <linux/capability.h> |
22 | #include <linux/sched.h> |
23 | #include <linux/suspend.h> |
24 | #include <linux/apm-emulation.h> |
25 | #include <linux/freezer.h> |
26 | #include <linux/device.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/list.h> |
29 | #include <linux/init.h> |
30 | #include <linux/completion.h> |
31 | #include <linux/kthread.h> |
32 | #include <linux/delay.h> |
33 | |
34 | |
35 | /* |
36 | * The apm_bios device is one of the misc char devices. |
37 | * This is its minor number. |
38 | */ |
39 | #define APM_MINOR_DEV 134 |
40 | |
41 | /* |
42 | * One option can be changed at boot time as follows: |
43 | * apm=on/off enable/disable APM |
44 | */ |
45 | |
46 | /* |
47 | * Maximum number of events stored |
48 | */ |
49 | #define APM_MAX_EVENTS 16 |
50 | |
51 | struct apm_queue { |
52 | unsigned int event_head; |
53 | unsigned int event_tail; |
54 | apm_event_t events[APM_MAX_EVENTS]; |
55 | }; |
56 | |
57 | /* |
58 | * thread states (for threads using a writable /dev/apm_bios fd): |
59 | * |
60 | * SUSPEND_NONE: nothing happening |
61 | * SUSPEND_PENDING: suspend event queued for thread and pending to be read |
62 | * SUSPEND_READ: suspend event read, pending acknowledgement |
63 | * SUSPEND_ACKED: acknowledgement received from thread (via ioctl), |
64 | * waiting for resume |
65 | * SUSPEND_ACKTO: acknowledgement timeout |
66 | * SUSPEND_DONE: thread had acked suspend and is now notified of |
67 | * resume |
68 | * |
69 | * SUSPEND_WAIT: this thread invoked suspend and is waiting for resume |
70 | * |
71 | * A thread migrates in one of three paths: |
72 | * NONE -1-> PENDING -2-> READ -3-> ACKED -4-> DONE -5-> NONE |
73 | * -6-> ACKTO -7-> NONE |
74 | * NONE -8-> WAIT -9-> NONE |
75 | * |
76 | * While in PENDING or READ, the thread is accounted for in the |
77 | * suspend_acks_pending counter. |
78 | * |
79 | * The transitions are invoked as follows: |
80 | * 1: suspend event is signalled from the core PM code |
81 | * 2: the suspend event is read from the fd by the userspace thread |
82 | * 3: userspace thread issues the APM_IOC_SUSPEND ioctl (as ack) |
83 | * 4: core PM code signals that we have resumed |
84 | * 5: APM_IOC_SUSPEND ioctl returns |
85 | * |
86 | * 6: the notifier invoked from the core PM code timed out waiting |
87 | * for all relevant threds to enter ACKED state and puts those |
88 | * that haven't into ACKTO |
89 | * 7: those threads issue APM_IOC_SUSPEND ioctl too late, |
90 | * get an error |
91 | * |
92 | * 8: userspace thread issues the APM_IOC_SUSPEND ioctl (to suspend), |
93 | * ioctl code invokes pm_suspend() |
94 | * 9: pm_suspend() returns indicating resume |
95 | */ |
96 | enum apm_suspend_state { |
97 | SUSPEND_NONE, |
98 | SUSPEND_PENDING, |
99 | SUSPEND_READ, |
100 | SUSPEND_ACKED, |
101 | SUSPEND_ACKTO, |
102 | SUSPEND_WAIT, |
103 | SUSPEND_DONE, |
104 | }; |
105 | |
106 | /* |
107 | * The per-file APM data |
108 | */ |
109 | struct apm_user { |
110 | struct list_head list; |
111 | |
112 | unsigned int suser: 1; |
113 | unsigned int writer: 1; |
114 | unsigned int reader: 1; |
115 | |
116 | int suspend_result; |
117 | enum apm_suspend_state suspend_state; |
118 | |
119 | struct apm_queue queue; |
120 | }; |
121 | |
122 | /* |
123 | * Local variables |
124 | */ |
125 | static atomic_t suspend_acks_pending = ATOMIC_INIT(0); |
126 | static atomic_t userspace_notification_inhibit = ATOMIC_INIT(0); |
127 | static int apm_disabled; |
128 | static struct task_struct *kapmd_tsk; |
129 | |
130 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); |
131 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); |
132 | |
133 | /* |
134 | * This is a list of everyone who has opened /dev/apm_bios |
135 | */ |
136 | static DECLARE_RWSEM(user_list_lock); |
137 | static LIST_HEAD(apm_user_list); |
138 | |
139 | /* |
140 | * kapmd info. kapmd provides us a process context to handle |
141 | * "APM" events within - specifically necessary if we're going |
142 | * to be suspending the system. |
143 | */ |
144 | static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait); |
145 | static DEFINE_SPINLOCK(kapmd_queue_lock); |
146 | static struct apm_queue kapmd_queue; |
147 | |
148 | static DEFINE_MUTEX(state_lock); |
149 | |
150 | static const char driver_version[] = "1.13"; /* no spaces */ |
151 | |
152 | |
153 | |
154 | /* |
155 | * Compatibility cruft until the IPAQ people move over to the new |
156 | * interface. |
157 | */ |
158 | static void __apm_get_power_status(struct apm_power_info *info) |
159 | { |
160 | } |
161 | |
162 | /* |
163 | * This allows machines to provide their own "apm get power status" function. |
164 | */ |
165 | void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status; |
166 | EXPORT_SYMBOL(apm_get_power_status); |
167 | |
168 | |
169 | /* |
170 | * APM event queue management. |
171 | */ |
172 | static inline int queue_empty(struct apm_queue *q) |
173 | { |
174 | return q->event_head == q->event_tail; |
175 | } |
176 | |
177 | static inline apm_event_t queue_get_event(struct apm_queue *q) |
178 | { |
179 | q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS; |
180 | return q->events[q->event_tail]; |
181 | } |
182 | |
183 | static void queue_add_event(struct apm_queue *q, apm_event_t event) |
184 | { |
185 | q->event_head = (q->event_head + 1) % APM_MAX_EVENTS; |
186 | if (q->event_head == q->event_tail) { |
187 | static int notified; |
188 | |
189 | if (notified++ == 0) |
190 | printk(KERN_ERR "apm: an event queue overflowed\n"); |
191 | q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS; |
192 | } |
193 | q->events[q->event_head] = event; |
194 | } |
195 | |
196 | static void queue_event(apm_event_t event) |
197 | { |
198 | struct apm_user *as; |
199 | |
200 | down_read(&user_list_lock); |
201 | list_for_each_entry(as, &apm_user_list, list) { |
202 | if (as->reader) |
203 | queue_add_event(&as->queue, event); |
204 | } |
205 | up_read(&user_list_lock); |
206 | wake_up_interruptible(&apm_waitqueue); |
207 | } |
208 | |
209 | static ssize_t apm_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) |
210 | { |
211 | struct apm_user *as = fp->private_data; |
212 | apm_event_t event; |
213 | int i = count, ret = 0; |
214 | |
215 | if (count < sizeof(apm_event_t)) |
216 | return -EINVAL; |
217 | |
218 | if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK) |
219 | return -EAGAIN; |
220 | |
221 | wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue)); |
222 | |
223 | while ((i >= sizeof(event)) && !queue_empty(&as->queue)) { |
224 | event = queue_get_event(&as->queue); |
225 | |
226 | ret = -EFAULT; |
227 | if (copy_to_user(buf, &event, sizeof(event))) |
228 | break; |
229 | |
230 | mutex_lock(&state_lock); |
231 | if (as->suspend_state == SUSPEND_PENDING && |
232 | (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)) |
233 | as->suspend_state = SUSPEND_READ; |
234 | mutex_unlock(&state_lock); |
235 | |
236 | buf += sizeof(event); |
237 | i -= sizeof(event); |
238 | } |
239 | |
240 | if (i < count) |
241 | ret = count - i; |
242 | |
243 | return ret; |
244 | } |
245 | |
246 | static unsigned int apm_poll(struct file *fp, poll_table * wait) |
247 | { |
248 | struct apm_user *as = fp->private_data; |
249 | |
250 | poll_wait(fp, &apm_waitqueue, wait); |
251 | return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM; |
252 | } |
253 | |
254 | /* |
255 | * apm_ioctl - handle APM ioctl |
256 | * |
257 | * APM_IOC_SUSPEND |
258 | * This IOCTL is overloaded, and performs two functions. It is used to: |
259 | * - initiate a suspend |
260 | * - acknowledge a suspend read from /dev/apm_bios. |
261 | * Only when everyone who has opened /dev/apm_bios with write permission |
262 | * has acknowledge does the actual suspend happen. |
263 | */ |
264 | static long |
265 | apm_ioctl(struct file *filp, u_int cmd, u_long arg) |
266 | { |
267 | struct apm_user *as = filp->private_data; |
268 | int err = -EINVAL; |
269 | |
270 | if (!as->suser || !as->writer) |
271 | return -EPERM; |
272 | |
273 | switch (cmd) { |
274 | case APM_IOC_SUSPEND: |
275 | mutex_lock(&state_lock); |
276 | |
277 | as->suspend_result = -EINTR; |
278 | |
279 | switch (as->suspend_state) { |
280 | case SUSPEND_READ: |
281 | /* |
282 | * If we read a suspend command from /dev/apm_bios, |
283 | * then the corresponding APM_IOC_SUSPEND ioctl is |
284 | * interpreted as an acknowledge. |
285 | */ |
286 | as->suspend_state = SUSPEND_ACKED; |
287 | atomic_dec(&suspend_acks_pending); |
288 | mutex_unlock(&state_lock); |
289 | |
290 | /* |
291 | * suspend_acks_pending changed, the notifier needs to |
292 | * be woken up for this |
293 | */ |
294 | wake_up(&apm_suspend_waitqueue); |
295 | |
296 | /* |
297 | * Wait for the suspend/resume to complete. If there |
298 | * are pending acknowledges, we wait here for them. |
299 | * wait_event_freezable() is interruptible and pending |
300 | * signal can cause busy looping. We aren't doing |
301 | * anything critical, chill a bit on each iteration. |
302 | */ |
303 | while (wait_event_freezable(apm_suspend_waitqueue, |
304 | as->suspend_state != SUSPEND_ACKED)) |
305 | msleep(10); |
306 | break; |
307 | case SUSPEND_ACKTO: |
308 | as->suspend_result = -ETIMEDOUT; |
309 | mutex_unlock(&state_lock); |
310 | break; |
311 | default: |
312 | as->suspend_state = SUSPEND_WAIT; |
313 | mutex_unlock(&state_lock); |
314 | |
315 | /* |
316 | * Otherwise it is a request to suspend the system. |
317 | * Just invoke pm_suspend(), we'll handle it from |
318 | * there via the notifier. |
319 | */ |
320 | as->suspend_result = pm_suspend(PM_SUSPEND_MEM); |
321 | } |
322 | |
323 | mutex_lock(&state_lock); |
324 | err = as->suspend_result; |
325 | as->suspend_state = SUSPEND_NONE; |
326 | mutex_unlock(&state_lock); |
327 | break; |
328 | } |
329 | |
330 | return err; |
331 | } |
332 | |
333 | static int apm_release(struct inode * inode, struct file * filp) |
334 | { |
335 | struct apm_user *as = filp->private_data; |
336 | |
337 | filp->private_data = NULL; |
338 | |
339 | down_write(&user_list_lock); |
340 | list_del(&as->list); |
341 | up_write(&user_list_lock); |
342 | |
343 | /* |
344 | * We are now unhooked from the chain. As far as new |
345 | * events are concerned, we no longer exist. |
346 | */ |
347 | mutex_lock(&state_lock); |
348 | if (as->suspend_state == SUSPEND_PENDING || |
349 | as->suspend_state == SUSPEND_READ) |
350 | atomic_dec(&suspend_acks_pending); |
351 | mutex_unlock(&state_lock); |
352 | |
353 | wake_up(&apm_suspend_waitqueue); |
354 | |
355 | kfree(as); |
356 | return 0; |
357 | } |
358 | |
359 | static int apm_open(struct inode * inode, struct file * filp) |
360 | { |
361 | struct apm_user *as; |
362 | |
363 | as = kzalloc(sizeof(*as), GFP_KERNEL); |
364 | if (as) { |
365 | /* |
366 | * XXX - this is a tiny bit broken, when we consider BSD |
367 | * process accounting. If the device is opened by root, we |
368 | * instantly flag that we used superuser privs. Who knows, |
369 | * we might close the device immediately without doing a |
370 | * privileged operation -- cevans |
371 | */ |
372 | as->suser = capable(CAP_SYS_ADMIN); |
373 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; |
374 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; |
375 | |
376 | down_write(&user_list_lock); |
377 | list_add(&as->list, &apm_user_list); |
378 | up_write(&user_list_lock); |
379 | |
380 | filp->private_data = as; |
381 | } |
382 | |
383 | return as ? 0 : -ENOMEM; |
384 | } |
385 | |
386 | static const struct file_operations apm_bios_fops = { |
387 | .owner = THIS_MODULE, |
388 | .read = apm_read, |
389 | .poll = apm_poll, |
390 | .unlocked_ioctl = apm_ioctl, |
391 | .open = apm_open, |
392 | .release = apm_release, |
393 | .llseek = noop_llseek, |
394 | }; |
395 | |
396 | static struct miscdevice apm_device = { |
397 | .minor = APM_MINOR_DEV, |
398 | .name = "apm_bios", |
399 | .fops = &apm_bios_fops |
400 | }; |
401 | |
402 | |
403 | #ifdef CONFIG_PROC_FS |
404 | /* |
405 | * Arguments, with symbols from linux/apm_bios.h. |
406 | * |
407 | * 0) Linux driver version (this will change if format changes) |
408 | * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. |
409 | * 2) APM flags from APM Installation Check (0x00): |
410 | * bit 0: APM_16_BIT_SUPPORT |
411 | * bit 1: APM_32_BIT_SUPPORT |
412 | * bit 2: APM_IDLE_SLOWS_CLOCK |
413 | * bit 3: APM_BIOS_DISABLED |
414 | * bit 4: APM_BIOS_DISENGAGED |
415 | * 3) AC line status |
416 | * 0x00: Off-line |
417 | * 0x01: On-line |
418 | * 0x02: On backup power (BIOS >= 1.1 only) |
419 | * 0xff: Unknown |
420 | * 4) Battery status |
421 | * 0x00: High |
422 | * 0x01: Low |
423 | * 0x02: Critical |
424 | * 0x03: Charging |
425 | * 0x04: Selected battery not present (BIOS >= 1.2 only) |
426 | * 0xff: Unknown |
427 | * 5) Battery flag |
428 | * bit 0: High |
429 | * bit 1: Low |
430 | * bit 2: Critical |
431 | * bit 3: Charging |
432 | * bit 7: No system battery |
433 | * 0xff: Unknown |
434 | * 6) Remaining battery life (percentage of charge): |
435 | * 0-100: valid |
436 | * -1: Unknown |
437 | * 7) Remaining battery life (time units): |
438 | * Number of remaining minutes or seconds |
439 | * -1: Unknown |
440 | * 8) min = minutes; sec = seconds |
441 | */ |
442 | static int proc_apm_show(struct seq_file *m, void *v) |
443 | { |
444 | struct apm_power_info info; |
445 | char *units; |
446 | |
447 | info.ac_line_status = 0xff; |
448 | info.battery_status = 0xff; |
449 | info.battery_flag = 0xff; |
450 | info.battery_life = -1; |
451 | info.time = -1; |
452 | info.units = -1; |
453 | |
454 | if (apm_get_power_status) |
455 | apm_get_power_status(&info); |
456 | |
457 | switch (info.units) { |
458 | default: units = "?"; break; |
459 | case 0: units = "min"; break; |
460 | case 1: units = "sec"; break; |
461 | } |
462 | |
463 | seq_printf(m, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", |
464 | driver_version, APM_32_BIT_SUPPORT, |
465 | info.ac_line_status, info.battery_status, |
466 | info.battery_flag, info.battery_life, |
467 | info.time, units); |
468 | |
469 | return 0; |
470 | } |
471 | |
472 | static int proc_apm_open(struct inode *inode, struct file *file) |
473 | { |
474 | return single_open(file, proc_apm_show, NULL); |
475 | } |
476 | |
477 | static const struct file_operations apm_proc_fops = { |
478 | .owner = THIS_MODULE, |
479 | .open = proc_apm_open, |
480 | .read = seq_read, |
481 | .llseek = seq_lseek, |
482 | .release = single_release, |
483 | }; |
484 | #endif |
485 | |
486 | static int kapmd(void *arg) |
487 | { |
488 | do { |
489 | apm_event_t event; |
490 | |
491 | wait_event_interruptible(kapmd_wait, |
492 | !queue_empty(&kapmd_queue) || kthread_should_stop()); |
493 | |
494 | if (kthread_should_stop()) |
495 | break; |
496 | |
497 | spin_lock_irq(&kapmd_queue_lock); |
498 | event = 0; |
499 | if (!queue_empty(&kapmd_queue)) |
500 | event = queue_get_event(&kapmd_queue); |
501 | spin_unlock_irq(&kapmd_queue_lock); |
502 | |
503 | switch (event) { |
504 | case 0: |
505 | break; |
506 | |
507 | case APM_LOW_BATTERY: |
508 | case APM_POWER_STATUS_CHANGE: |
509 | queue_event(event); |
510 | break; |
511 | |
512 | case APM_USER_SUSPEND: |
513 | case APM_SYS_SUSPEND: |
514 | pm_suspend(PM_SUSPEND_MEM); |
515 | break; |
516 | |
517 | case APM_CRITICAL_SUSPEND: |
518 | atomic_inc(&userspace_notification_inhibit); |
519 | pm_suspend(PM_SUSPEND_MEM); |
520 | atomic_dec(&userspace_notification_inhibit); |
521 | break; |
522 | } |
523 | } while (1); |
524 | |
525 | return 0; |
526 | } |
527 | |
528 | static int apm_suspend_notifier(struct notifier_block *nb, |
529 | unsigned long event, |
530 | void *dummy) |
531 | { |
532 | struct apm_user *as; |
533 | int err; |
534 | |
535 | /* short-cut emergency suspends */ |
536 | if (atomic_read(&userspace_notification_inhibit)) |
537 | return NOTIFY_DONE; |
538 | |
539 | switch (event) { |
540 | case PM_SUSPEND_PREPARE: |
541 | /* |
542 | * Queue an event to all "writer" users that we want |
543 | * to suspend and need their ack. |
544 | */ |
545 | mutex_lock(&state_lock); |
546 | down_read(&user_list_lock); |
547 | |
548 | list_for_each_entry(as, &apm_user_list, list) { |
549 | if (as->suspend_state != SUSPEND_WAIT && as->reader && |
550 | as->writer && as->suser) { |
551 | as->suspend_state = SUSPEND_PENDING; |
552 | atomic_inc(&suspend_acks_pending); |
553 | queue_add_event(&as->queue, APM_USER_SUSPEND); |
554 | } |
555 | } |
556 | |
557 | up_read(&user_list_lock); |
558 | mutex_unlock(&state_lock); |
559 | wake_up_interruptible(&apm_waitqueue); |
560 | |
561 | /* |
562 | * Wait for the the suspend_acks_pending variable to drop to |
563 | * zero, meaning everybody acked the suspend event (or the |
564 | * process was killed.) |
565 | * |
566 | * If the app won't answer within a short while we assume it |
567 | * locked up and ignore it. |
568 | */ |
569 | err = wait_event_interruptible_timeout( |
570 | apm_suspend_waitqueue, |
571 | atomic_read(&suspend_acks_pending) == 0, |
572 | 5*HZ); |
573 | |
574 | /* timed out */ |
575 | if (err == 0) { |
576 | /* |
577 | * Move anybody who timed out to "ack timeout" state. |
578 | * |
579 | * We could time out and the userspace does the ACK |
580 | * right after we time out but before we enter the |
581 | * locked section here, but that's fine. |
582 | */ |
583 | mutex_lock(&state_lock); |
584 | down_read(&user_list_lock); |
585 | list_for_each_entry(as, &apm_user_list, list) { |
586 | if (as->suspend_state == SUSPEND_PENDING || |
587 | as->suspend_state == SUSPEND_READ) { |
588 | as->suspend_state = SUSPEND_ACKTO; |
589 | atomic_dec(&suspend_acks_pending); |
590 | } |
591 | } |
592 | up_read(&user_list_lock); |
593 | mutex_unlock(&state_lock); |
594 | } |
595 | |
596 | /* let suspend proceed */ |
597 | if (err >= 0) |
598 | return NOTIFY_OK; |
599 | |
600 | /* interrupted by signal */ |
601 | return notifier_from_errno(err); |
602 | |
603 | case PM_POST_SUSPEND: |
604 | /* |
605 | * Anyone on the APM queues will think we're still suspended. |
606 | * Send a message so everyone knows we're now awake again. |
607 | */ |
608 | queue_event(APM_NORMAL_RESUME); |
609 | |
610 | /* |
611 | * Finally, wake up anyone who is sleeping on the suspend. |
612 | */ |
613 | mutex_lock(&state_lock); |
614 | down_read(&user_list_lock); |
615 | list_for_each_entry(as, &apm_user_list, list) { |
616 | if (as->suspend_state == SUSPEND_ACKED) { |
617 | /* |
618 | * TODO: maybe grab error code, needs core |
619 | * changes to push the error to the notifier |
620 | * chain (could use the second parameter if |
621 | * implemented) |
622 | */ |
623 | as->suspend_result = 0; |
624 | as->suspend_state = SUSPEND_DONE; |
625 | } |
626 | } |
627 | up_read(&user_list_lock); |
628 | mutex_unlock(&state_lock); |
629 | |
630 | wake_up(&apm_suspend_waitqueue); |
631 | return NOTIFY_OK; |
632 | |
633 | default: |
634 | return NOTIFY_DONE; |
635 | } |
636 | } |
637 | |
638 | static struct notifier_block apm_notif_block = { |
639 | .notifier_call = apm_suspend_notifier, |
640 | }; |
641 | |
642 | static int __init apm_init(void) |
643 | { |
644 | int ret; |
645 | |
646 | if (apm_disabled) { |
647 | printk(KERN_NOTICE "apm: disabled on user request.\n"); |
648 | return -ENODEV; |
649 | } |
650 | |
651 | kapmd_tsk = kthread_create(kapmd, NULL, "kapmd"); |
652 | if (IS_ERR(kapmd_tsk)) { |
653 | ret = PTR_ERR(kapmd_tsk); |
654 | kapmd_tsk = NULL; |
655 | goto out; |
656 | } |
657 | wake_up_process(kapmd_tsk); |
658 | |
659 | #ifdef CONFIG_PROC_FS |
660 | proc_create("apm", 0, NULL, &apm_proc_fops); |
661 | #endif |
662 | |
663 | ret = misc_register(&apm_device); |
664 | if (ret) |
665 | goto out_stop; |
666 | |
667 | ret = register_pm_notifier(&apm_notif_block); |
668 | if (ret) |
669 | goto out_unregister; |
670 | |
671 | return 0; |
672 | |
673 | out_unregister: |
674 | misc_deregister(&apm_device); |
675 | out_stop: |
676 | remove_proc_entry("apm", NULL); |
677 | kthread_stop(kapmd_tsk); |
678 | out: |
679 | return ret; |
680 | } |
681 | |
682 | static void __exit apm_exit(void) |
683 | { |
684 | unregister_pm_notifier(&apm_notif_block); |
685 | misc_deregister(&apm_device); |
686 | remove_proc_entry("apm", NULL); |
687 | |
688 | kthread_stop(kapmd_tsk); |
689 | } |
690 | |
691 | module_init(apm_init); |
692 | module_exit(apm_exit); |
693 | |
694 | MODULE_AUTHOR("Stephen Rothwell"); |
695 | MODULE_DESCRIPTION("Advanced Power Management"); |
696 | MODULE_LICENSE("GPL"); |
697 | |
698 | #ifndef MODULE |
699 | static int __init apm_setup(char *str) |
700 | { |
701 | while ((str != NULL) && (*str != '\0')) { |
702 | if (strncmp(str, "off", 3) == 0) |
703 | apm_disabled = 1; |
704 | if (strncmp(str, "on", 2) == 0) |
705 | apm_disabled = 0; |
706 | str = strchr(str, ','); |
707 | if (str != NULL) |
708 | str += strspn(str, ", \t"); |
709 | } |
710 | return 1; |
711 | } |
712 | |
713 | __setup("apm=", apm_setup); |
714 | #endif |
715 | |
716 | /** |
717 | * apm_queue_event - queue an APM event for kapmd |
718 | * @event: APM event |
719 | * |
720 | * Queue an APM event for kapmd to process and ultimately take the |
721 | * appropriate action. Only a subset of events are handled: |
722 | * %APM_LOW_BATTERY |
723 | * %APM_POWER_STATUS_CHANGE |
724 | * %APM_USER_SUSPEND |
725 | * %APM_SYS_SUSPEND |
726 | * %APM_CRITICAL_SUSPEND |
727 | */ |
728 | void apm_queue_event(apm_event_t event) |
729 | { |
730 | unsigned long flags; |
731 | |
732 | spin_lock_irqsave(&kapmd_queue_lock, flags); |
733 | queue_add_event(&kapmd_queue, event); |
734 | spin_unlock_irqrestore(&kapmd_queue_lock, flags); |
735 | |
736 | wake_up_interruptible(&kapmd_wait); |
737 | } |
738 | EXPORT_SYMBOL(apm_queue_event); |
739 |
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