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1 | /* |
2 | * dock.c - ACPI dock station driver | |
3 | * | |
4 | * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> | |
5 | * | |
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or (at | |
11 | * your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | * | |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <acpi/acpi_bus.h> | |
31 | #include <acpi/acpi_drivers.h> | |
32 | ||
33 | #define ACPI_DOCK_DRIVER_NAME "ACPI Dock Station Driver" | |
34 | ||
35 | ACPI_MODULE_NAME("dock") | |
36 | MODULE_AUTHOR("Kristen Carlson Accardi"); | |
37 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_NAME); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
40 | static struct atomic_notifier_head dock_notifier_list; | |
41 | ||
42 | struct dock_station { | |
43 | acpi_handle handle; | |
44 | unsigned long last_dock_time; | |
45 | u32 flags; | |
46 | spinlock_t dd_lock; | |
47 | spinlock_t hp_lock; | |
48 | struct list_head dependent_devices; | |
49 | struct list_head hotplug_devices; | |
50 | }; | |
51 | ||
52 | struct dock_dependent_device { | |
53 | struct list_head list; | |
54 | struct list_head hotplug_list; | |
55 | acpi_handle handle; | |
56 | acpi_notify_handler handler; | |
57 | void *context; | |
58 | }; | |
59 | ||
60 | #define DOCK_DOCKING 0x00000001 | |
61 | #define DOCK_EVENT KOBJ_DOCK | |
62 | #define UNDOCK_EVENT KOBJ_UNDOCK | |
63 | ||
64 | static struct dock_station *dock_station; | |
65 | ||
66 | /***************************************************************************** | |
67 | * Dock Dependent device functions * | |
68 | *****************************************************************************/ | |
69 | /** | |
70 | * alloc_dock_dependent_device - allocate and init a dependent device | |
71 | * @handle: the acpi_handle of the dependent device | |
72 | * | |
73 | * Allocate memory for a dependent device structure for a device referenced | |
74 | * by the acpi handle | |
75 | */ | |
76 | static struct dock_dependent_device * | |
77 | alloc_dock_dependent_device(acpi_handle handle) | |
78 | { | |
79 | struct dock_dependent_device *dd; | |
80 | ||
81 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
82 | if (dd) { | |
83 | dd->handle = handle; | |
84 | INIT_LIST_HEAD(&dd->list); | |
85 | INIT_LIST_HEAD(&dd->hotplug_list); | |
86 | } | |
87 | return dd; | |
88 | } | |
89 | ||
90 | /** | |
91 | * add_dock_dependent_device - associate a device with the dock station | |
92 | * @ds: The dock station | |
93 | * @dd: The dependent device | |
94 | * | |
95 | * Add the dependent device to the dock's dependent device list. | |
96 | */ | |
97 | static void | |
98 | add_dock_dependent_device(struct dock_station *ds, | |
99 | struct dock_dependent_device *dd) | |
100 | { | |
101 | spin_lock(&ds->dd_lock); | |
102 | list_add_tail(&dd->list, &ds->dependent_devices); | |
103 | spin_unlock(&ds->dd_lock); | |
104 | } | |
105 | ||
106 | /** | |
107 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
108 | * @ds: The dock station | |
109 | * @dd: The dependent device struct | |
110 | * | |
111 | * Add the dependent device to the dock's hotplug device list | |
112 | */ | |
113 | static void | |
114 | dock_add_hotplug_device(struct dock_station *ds, | |
115 | struct dock_dependent_device *dd) | |
116 | { | |
117 | spin_lock(&ds->hp_lock); | |
118 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); | |
119 | spin_unlock(&ds->hp_lock); | |
120 | } | |
121 | ||
122 | /** | |
123 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
124 | * @ds: The dock station | |
125 | * @dd: the dependent device struct | |
126 | * | |
127 | * Delete the dependent device from the dock's hotplug device list | |
128 | */ | |
129 | static void | |
130 | dock_del_hotplug_device(struct dock_station *ds, | |
131 | struct dock_dependent_device *dd) | |
132 | { | |
133 | spin_lock(&ds->hp_lock); | |
134 | list_del(&dd->hotplug_list); | |
135 | spin_unlock(&ds->hp_lock); | |
136 | } | |
137 | ||
138 | /** | |
139 | * find_dock_dependent_device - get a device dependent on this dock | |
140 | * @ds: the dock station | |
141 | * @handle: the acpi_handle of the device we want | |
142 | * | |
143 | * iterate over the dependent device list for this dock. If the | |
144 | * dependent device matches the handle, return. | |
145 | */ | |
146 | static struct dock_dependent_device * | |
147 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
148 | { | |
149 | struct dock_dependent_device *dd; | |
150 | ||
151 | spin_lock(&ds->dd_lock); | |
152 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
153 | if (handle == dd->handle) { | |
154 | spin_unlock(&ds->dd_lock); | |
155 | return dd; | |
156 | } | |
157 | } | |
158 | spin_unlock(&ds->dd_lock); | |
159 | return NULL; | |
160 | } | |
161 | ||
162 | /***************************************************************************** | |
163 | * Dock functions * | |
164 | *****************************************************************************/ | |
165 | /** | |
166 | * is_dock - see if a device is a dock station | |
167 | * @handle: acpi handle of the device | |
168 | * | |
169 | * If an acpi object has a _DCK method, then it is by definition a dock | |
170 | * station, so return true. | |
171 | */ | |
172 | static int is_dock(acpi_handle handle) | |
173 | { | |
174 | acpi_status status; | |
175 | acpi_handle tmp; | |
176 | ||
177 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
178 | if (ACPI_FAILURE(status)) | |
179 | return 0; | |
180 | return 1; | |
181 | } | |
182 | ||
183 | /** | |
184 | * is_dock_device - see if a device is on a dock station | |
185 | * @handle: acpi handle of the device | |
186 | * | |
187 | * If this device is either the dock station itself, | |
188 | * or is a device dependent on the dock station, then it | |
189 | * is a dock device | |
190 | */ | |
191 | int is_dock_device(acpi_handle handle) | |
192 | { | |
193 | if (!dock_station) | |
194 | return 0; | |
195 | ||
196 | if (is_dock(handle) || find_dock_dependent_device(dock_station, handle)) | |
197 | return 1; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | EXPORT_SYMBOL_GPL(is_dock_device); | |
203 | ||
204 | /** | |
205 | * dock_present - see if the dock station is present. | |
206 | * @ds: the dock station | |
207 | * | |
208 | * execute the _STA method. note that present does not | |
209 | * imply that we are docked. | |
210 | */ | |
211 | static int dock_present(struct dock_station *ds) | |
212 | { | |
213 | unsigned long sta; | |
214 | acpi_status status; | |
215 | ||
216 | if (ds) { | |
217 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
218 | if (ACPI_SUCCESS(status) && sta) | |
219 | return 1; | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | ||
225 | ||
226 | /** | |
227 | * dock_create_acpi_device - add new devices to acpi | |
228 | * @handle - handle of the device to add | |
229 | * | |
230 | * This function will create a new acpi_device for the given | |
231 | * handle if one does not exist already. This should cause | |
232 | * acpi to scan for drivers for the given devices, and call | |
233 | * matching driver's add routine. | |
234 | * | |
235 | * Returns a pointer to the acpi_device corresponding to the handle. | |
236 | */ | |
237 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
238 | { | |
239 | struct acpi_device *device = NULL; | |
240 | struct acpi_device *parent_device; | |
241 | acpi_handle parent; | |
242 | int ret; | |
243 | ||
244 | if (acpi_bus_get_device(handle, &device)) { | |
245 | /* | |
246 | * no device created for this object, | |
247 | * so we should create one. | |
248 | */ | |
249 | acpi_get_parent(handle, &parent); | |
250 | if (acpi_bus_get_device(parent, &parent_device)) | |
251 | parent_device = NULL; | |
252 | ||
253 | ret = acpi_bus_add(&device, parent_device, handle, | |
254 | ACPI_BUS_TYPE_DEVICE); | |
255 | if (ret) { | |
256 | pr_debug("error adding bus, %x\n", | |
257 | -ret); | |
258 | return NULL; | |
259 | } | |
260 | } | |
261 | return device; | |
262 | } | |
263 | ||
264 | /** | |
265 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
266 | * @handle - the handle of the device to remove | |
267 | * | |
268 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
269 | * driver to have it's remove routine called. | |
270 | */ | |
271 | static void dock_remove_acpi_device(acpi_handle handle) | |
272 | { | |
273 | struct acpi_device *device; | |
274 | int ret; | |
275 | ||
276 | if (!acpi_bus_get_device(handle, &device)) { | |
277 | ret = acpi_bus_trim(device, 1); | |
278 | if (ret) | |
279 | pr_debug("error removing bus, %x\n", -ret); | |
280 | } | |
281 | } | |
282 | ||
283 | ||
284 | /** | |
285 | * hotplug_dock_devices - insert or remove devices on the dock station | |
286 | * @ds: the dock station | |
287 | * @event: either bus check or eject request | |
288 | * | |
289 | * Some devices on the dock station need to have drivers called | |
290 | * to perform hotplug operations after a dock event has occurred. | |
291 | * Traverse the list of dock devices that have registered a | |
292 | * hotplug handler, and call the handler. | |
293 | */ | |
294 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
295 | { | |
296 | struct dock_dependent_device *dd; | |
297 | ||
298 | spin_lock(&ds->hp_lock); | |
299 | ||
300 | /* | |
301 | * First call driver specific hotplug functions | |
302 | */ | |
303 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { | |
304 | if (dd->handler) | |
305 | dd->handler(dd->handle, event, dd->context); | |
306 | } | |
307 | ||
308 | /* | |
309 | * Now make sure that an acpi_device is created for each | |
310 | * dependent device, or removed if this is an eject request. | |
311 | * This will cause acpi_drivers to be stopped/started if they | |
312 | * exist | |
313 | */ | |
314 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
315 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
316 | dock_remove_acpi_device(dd->handle); | |
317 | else | |
318 | dock_create_acpi_device(dd->handle); | |
319 | } | |
320 | spin_unlock(&ds->hp_lock); | |
321 | } | |
322 | ||
323 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
324 | { | |
325 | struct acpi_device *device; | |
326 | ||
327 | device = dock_create_acpi_device(ds->handle); | |
328 | if (device) | |
329 | kobject_uevent(&device->kobj, num); | |
330 | } | |
331 | ||
332 | /** | |
333 | * eject_dock - respond to a dock eject request | |
334 | * @ds: the dock station | |
335 | * | |
336 | * This is called after _DCK is called, to execute the dock station's | |
337 | * _EJ0 method. | |
338 | */ | |
339 | static void eject_dock(struct dock_station *ds) | |
340 | { | |
341 | struct acpi_object_list arg_list; | |
342 | union acpi_object arg; | |
343 | acpi_status status; | |
344 | acpi_handle tmp; | |
345 | ||
346 | /* all dock devices should have _EJ0, but check anyway */ | |
347 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
348 | if (ACPI_FAILURE(status)) { | |
349 | pr_debug("No _EJ0 support for dock device\n"); | |
350 | return; | |
351 | } | |
352 | ||
353 | arg_list.count = 1; | |
354 | arg_list.pointer = &arg; | |
355 | arg.type = ACPI_TYPE_INTEGER; | |
356 | arg.integer.value = 1; | |
357 | ||
358 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
359 | &arg_list, NULL))) | |
360 | pr_debug("Failed to evaluate _EJ0!\n"); | |
361 | } | |
362 | ||
363 | /** | |
364 | * handle_dock - handle a dock event | |
365 | * @ds: the dock station | |
366 | * @dock: to dock, or undock - that is the question | |
367 | * | |
368 | * Execute the _DCK method in response to an acpi event | |
369 | */ | |
370 | static void handle_dock(struct dock_station *ds, int dock) | |
371 | { | |
372 | acpi_status status; | |
373 | struct acpi_object_list arg_list; | |
374 | union acpi_object arg; | |
375 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
376 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
377 | union acpi_object *obj; | |
378 | ||
379 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
380 | obj = name_buffer.pointer; | |
381 | ||
382 | printk(KERN_INFO PREFIX "%s\n", dock ? "docking" : "undocking"); | |
383 | ||
384 | /* _DCK method has one argument */ | |
385 | arg_list.count = 1; | |
386 | arg_list.pointer = &arg; | |
387 | arg.type = ACPI_TYPE_INTEGER; | |
388 | arg.integer.value = dock; | |
389 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
390 | if (ACPI_FAILURE(status)) | |
391 | pr_debug("%s: failed to execute _DCK\n", obj->string.pointer); | |
392 | kfree(buffer.pointer); | |
393 | kfree(name_buffer.pointer); | |
394 | } | |
395 | ||
396 | static inline void dock(struct dock_station *ds) | |
397 | { | |
398 | handle_dock(ds, 1); | |
399 | } | |
400 | ||
401 | static inline void undock(struct dock_station *ds) | |
402 | { | |
403 | handle_dock(ds, 0); | |
404 | } | |
405 | ||
406 | static inline void begin_dock(struct dock_station *ds) | |
407 | { | |
408 | ds->flags |= DOCK_DOCKING; | |
409 | } | |
410 | ||
411 | static inline void complete_dock(struct dock_station *ds) | |
412 | { | |
413 | ds->flags &= ~(DOCK_DOCKING); | |
414 | ds->last_dock_time = jiffies; | |
415 | } | |
416 | ||
417 | /** | |
418 | * dock_in_progress - see if we are in the middle of handling a dock event | |
419 | * @ds: the dock station | |
420 | * | |
421 | * Sometimes while docking, false dock events can be sent to the driver | |
422 | * because good connections aren't made or some other reason. Ignore these | |
423 | * if we are in the middle of doing something. | |
424 | */ | |
425 | static int dock_in_progress(struct dock_station *ds) | |
426 | { | |
427 | if ((ds->flags & DOCK_DOCKING) || | |
428 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
429 | return 1; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /** | |
434 | * register_dock_notifier - add yourself to the dock notifier list | |
435 | * @nb: the callers notifier block | |
436 | * | |
437 | * If a driver wishes to be notified about dock events, they can | |
438 | * use this function to put a notifier block on the dock notifier list. | |
439 | * this notifier call chain will be called after a dock event, but | |
440 | * before hotplugging any new devices. | |
441 | */ | |
442 | int register_dock_notifier(struct notifier_block *nb) | |
443 | { | |
444 | return atomic_notifier_chain_register(&dock_notifier_list, nb); | |
445 | } | |
446 | ||
447 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
448 | ||
449 | /** | |
450 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
451 | * @nb: the callers notifier block | |
452 | */ | |
453 | void unregister_dock_notifier(struct notifier_block *nb) | |
454 | { | |
455 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); | |
456 | } | |
457 | ||
458 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
459 | ||
460 | /** | |
461 | * register_hotplug_dock_device - register a hotplug function | |
462 | * @handle: the handle of the device | |
463 | * @handler: the acpi_notifier_handler to call after docking | |
464 | * @context: device specific data | |
465 | * | |
466 | * If a driver would like to perform a hotplug operation after a dock | |
467 | * event, they can register an acpi_notifiy_handler to be called by | |
468 | * the dock driver after _DCK is executed. | |
469 | */ | |
470 | int | |
471 | register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler, | |
472 | void *context) | |
473 | { | |
474 | struct dock_dependent_device *dd; | |
475 | ||
476 | if (!dock_station) | |
477 | return -ENODEV; | |
478 | ||
479 | /* | |
480 | * make sure this handle is for a device dependent on the dock, | |
481 | * this would include the dock station itself | |
482 | */ | |
483 | dd = find_dock_dependent_device(dock_station, handle); | |
484 | if (dd) { | |
485 | dd->handler = handler; | |
486 | dd->context = context; | |
487 | dock_add_hotplug_device(dock_station, dd); | |
488 | return 0; | |
489 | } | |
490 | ||
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
495 | ||
496 | /** | |
497 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
498 | * @handle: the acpi handle of the device | |
499 | */ | |
500 | void unregister_hotplug_dock_device(acpi_handle handle) | |
501 | { | |
502 | struct dock_dependent_device *dd; | |
503 | ||
504 | if (!dock_station) | |
505 | return; | |
506 | ||
507 | dd = find_dock_dependent_device(dock_station, handle); | |
508 | if (dd) | |
509 | dock_del_hotplug_device(dock_station, dd); | |
510 | } | |
511 | ||
512 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
513 | ||
514 | /** | |
515 | * dock_notify - act upon an acpi dock notification | |
516 | * @handle: the dock station handle | |
517 | * @event: the acpi event | |
518 | * @data: our driver data struct | |
519 | * | |
520 | * If we are notified to dock, then check to see if the dock is | |
521 | * present and then dock. Notify all drivers of the dock event, | |
522 | * and then hotplug and devices that may need hotplugging. For undock | |
523 | * check to make sure the dock device is still present, then undock | |
524 | * and hotremove all the devices that may need removing. | |
525 | */ | |
526 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
527 | { | |
528 | struct dock_station *ds = (struct dock_station *)data; | |
529 | ||
530 | switch (event) { | |
531 | case ACPI_NOTIFY_BUS_CHECK: | |
532 | if (!dock_in_progress(ds) && dock_present(ds)) { | |
533 | begin_dock(ds); | |
534 | dock(ds); | |
535 | if (!dock_present(ds)) { | |
536 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
537 | break; | |
538 | } | |
539 | atomic_notifier_call_chain(&dock_notifier_list, | |
540 | event, NULL); | |
541 | hotplug_dock_devices(ds, event); | |
542 | complete_dock(ds); | |
543 | dock_event(ds, event, DOCK_EVENT); | |
544 | } | |
545 | break; | |
546 | case ACPI_NOTIFY_DEVICE_CHECK: | |
547 | /* | |
548 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
549 | * is sent and _DCK is present, it is assumed to mean an | |
550 | * undock request. This notify routine will only be called | |
551 | * for objects defining _DCK, so we will fall through to eject | |
552 | * request here. However, we will pass an eject request through | |
553 | * to the driver who wish to hotplug. | |
554 | */ | |
555 | case ACPI_NOTIFY_EJECT_REQUEST: | |
556 | if (!dock_in_progress(ds) && dock_present(ds)) { | |
557 | /* | |
558 | * here we need to generate the undock | |
559 | * event prior to actually doing the undock | |
560 | * so that the device struct still exists. | |
561 | */ | |
562 | dock_event(ds, event, UNDOCK_EVENT); | |
563 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); | |
564 | undock(ds); | |
565 | eject_dock(ds); | |
566 | if (dock_present(ds)) | |
567 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
568 | } | |
569 | break; | |
570 | default: | |
571 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
572 | } | |
573 | } | |
574 | ||
575 | /** | |
576 | * find_dock_devices - find devices on the dock station | |
577 | * @handle: the handle of the device we are examining | |
578 | * @lvl: unused | |
579 | * @context: the dock station private data | |
580 | * @rv: unused | |
581 | * | |
582 | * This function is called by acpi_walk_namespace. It will | |
583 | * check to see if an object has an _EJD method. If it does, then it | |
584 | * will see if it is dependent on the dock station. | |
585 | */ | |
586 | static acpi_status | |
587 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
588 | { | |
589 | acpi_status status; | |
590 | acpi_handle tmp; | |
591 | struct dock_station *ds = (struct dock_station *)context; | |
592 | struct dock_dependent_device *dd; | |
593 | ||
594 | status = acpi_bus_get_ejd(handle, &tmp); | |
595 | if (ACPI_FAILURE(status)) | |
596 | return AE_OK; | |
597 | ||
598 | if (tmp == ds->handle) { | |
599 | dd = alloc_dock_dependent_device(handle); | |
600 | if (dd) | |
601 | add_dock_dependent_device(ds, dd); | |
602 | } | |
603 | ||
604 | return AE_OK; | |
605 | } | |
606 | ||
607 | /** | |
608 | * dock_add - add a new dock station | |
609 | * @handle: the dock station handle | |
610 | * | |
611 | * allocated and initialize a new dock station device. Find all devices | |
612 | * that are on the dock station, and register for dock event notifications. | |
613 | */ | |
614 | static int dock_add(acpi_handle handle) | |
615 | { | |
616 | int ret; | |
617 | acpi_status status; | |
618 | struct dock_dependent_device *dd; | |
619 | ||
620 | /* allocate & initialize the dock_station private data */ | |
621 | dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); | |
622 | if (!dock_station) | |
623 | return -ENOMEM; | |
624 | dock_station->handle = handle; | |
625 | dock_station->last_dock_time = jiffies - HZ; | |
626 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
627 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
628 | spin_lock_init(&dock_station->dd_lock); | |
629 | spin_lock_init(&dock_station->hp_lock); | |
07a18684 | 630 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c LB |
631 | |
632 | /* Find dependent devices */ | |
633 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
634 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
635 | NULL); | |
636 | ||
637 | /* add the dock station as a device dependent on itself */ | |
638 | dd = alloc_dock_dependent_device(handle); | |
639 | if (!dd) { | |
640 | kfree(dock_station); | |
641 | return -ENOMEM; | |
642 | } | |
643 | add_dock_dependent_device(dock_station, dd); | |
644 | ||
645 | /* register for dock events */ | |
646 | status = acpi_install_notify_handler(dock_station->handle, | |
647 | ACPI_SYSTEM_NOTIFY, | |
648 | dock_notify, dock_station); | |
649 | ||
650 | if (ACPI_FAILURE(status)) { | |
651 | printk(KERN_ERR PREFIX "Error installing notify handler\n"); | |
652 | ret = -ENODEV; | |
653 | goto dock_add_err; | |
654 | } | |
655 | ||
656 | printk(KERN_INFO PREFIX "%s \n", ACPI_DOCK_DRIVER_NAME); | |
657 | ||
658 | return 0; | |
659 | ||
660 | dock_add_err: | |
661 | kfree(dock_station); | |
662 | kfree(dd); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | /** | |
667 | * dock_remove - free up resources related to the dock station | |
668 | */ | |
669 | static int dock_remove(void) | |
670 | { | |
671 | struct dock_dependent_device *dd, *tmp; | |
672 | acpi_status status; | |
673 | ||
674 | if (!dock_station) | |
675 | return 0; | |
676 | ||
677 | /* remove dependent devices */ | |
678 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
679 | list) | |
680 | kfree(dd); | |
681 | ||
682 | /* remove dock notify handler */ | |
683 | status = acpi_remove_notify_handler(dock_station->handle, | |
684 | ACPI_SYSTEM_NOTIFY, | |
685 | dock_notify); | |
686 | if (ACPI_FAILURE(status)) | |
687 | printk(KERN_ERR "Error removing notify handler\n"); | |
688 | ||
689 | /* free dock station memory */ | |
690 | kfree(dock_station); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /** | |
695 | * find_dock - look for a dock station | |
696 | * @handle: acpi handle of a device | |
697 | * @lvl: unused | |
698 | * @context: counter of dock stations found | |
699 | * @rv: unused | |
700 | * | |
701 | * This is called by acpi_walk_namespace to look for dock stations. | |
702 | */ | |
703 | static acpi_status | |
704 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
705 | { | |
706 | int *count = (int *)context; | |
707 | acpi_status status = AE_OK; | |
708 | ||
709 | if (is_dock(handle)) { | |
710 | if (dock_add(handle) >= 0) { | |
711 | (*count)++; | |
712 | status = AE_CTRL_TERMINATE; | |
713 | } | |
714 | } | |
715 | return status; | |
716 | } | |
717 | ||
718 | static int __init dock_init(void) | |
719 | { | |
720 | int num = 0; | |
721 | ||
722 | dock_station = NULL; | |
723 | ||
724 | /* look for a dock station */ | |
725 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
726 | ACPI_UINT32_MAX, find_dock, &num, NULL); | |
727 | ||
728 | if (!num) | |
729 | return -ENODEV; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static void __exit dock_exit(void) | |
735 | { | |
736 | dock_remove(); | |
737 | } | |
738 | ||
739 | postcore_initcall(dock_init); | |
740 | module_exit(dock_exit); |