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c8f7a62c LB |
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> | |
671adbec | 30 | #include <linux/platform_device.h> |
914e2637 | 31 | #include <linux/jiffies.h> |
62a6d7fd | 32 | #include <linux/stddef.h> |
c8f7a62c LB |
33 | #include <acpi/acpi_bus.h> |
34 | #include <acpi/acpi_drivers.h> | |
35 | ||
a192a958 LB |
36 | #define PREFIX "ACPI: " |
37 | ||
7cda93e0 | 38 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
c8f7a62c | 39 | |
f52fd66d | 40 | ACPI_MODULE_NAME("dock"); |
c8f7a62c | 41 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
7cda93e0 | 42 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
43 | MODULE_LICENSE("GPL"); |
44 | ||
a0cd35fd KCA |
45 | static int immediate_undock = 1; |
46 | module_param(immediate_undock, bool, 0644); | |
47 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " | |
48 | "undock immediately when the undock button is pressed, 0 will cause" | |
49 | " the driver to wait for userspace to write the undock sysfs file " | |
50 | " before undocking"); | |
51 | ||
c8f7a62c LB |
52 | static struct atomic_notifier_head dock_notifier_list; |
53 | ||
a340af14 FS |
54 | static const struct acpi_device_id dock_device_ids[] = { |
55 | {"LNXDOCK", 0}, | |
56 | {"", 0}, | |
57 | }; | |
58 | MODULE_DEVICE_TABLE(acpi, dock_device_ids); | |
59 | ||
c8f7a62c LB |
60 | struct dock_station { |
61 | acpi_handle handle; | |
62 | unsigned long last_dock_time; | |
63 | u32 flags; | |
64 | spinlock_t dd_lock; | |
8b0dc866 | 65 | struct mutex hp_lock; |
c8f7a62c LB |
66 | struct list_head dependent_devices; |
67 | struct list_head hotplug_devices; | |
db350b08 | 68 | |
50d716e4 | 69 | struct list_head sibling; |
db350b08 | 70 | struct platform_device *dock_device; |
c8f7a62c | 71 | }; |
db350b08 SL |
72 | static LIST_HEAD(dock_stations); |
73 | static int dock_station_count; | |
c8f7a62c LB |
74 | |
75 | struct dock_dependent_device { | |
76 | struct list_head list; | |
77 | struct list_head hotplug_list; | |
78 | acpi_handle handle; | |
1253f7aa | 79 | struct acpi_dock_ops *ops; |
c8f7a62c LB |
80 | void *context; |
81 | }; | |
82 | ||
83 | #define DOCK_DOCKING 0x00000001 | |
a0cd35fd | 84 | #define DOCK_UNDOCKING 0x00000002 |
db350b08 SL |
85 | #define DOCK_IS_DOCK 0x00000010 |
86 | #define DOCK_IS_ATA 0x00000020 | |
87 | #define DOCK_IS_BAT 0x00000040 | |
5669021e KCA |
88 | #define DOCK_EVENT 3 |
89 | #define UNDOCK_EVENT 2 | |
c8f7a62c | 90 | |
c8f7a62c LB |
91 | /***************************************************************************** |
92 | * Dock Dependent device functions * | |
93 | *****************************************************************************/ | |
94 | /** | |
f69cfdd2 AC |
95 | * add_dock_dependent_device - associate a device with the dock station |
96 | * @ds: The dock station | |
97 | * @handle: handle of the dependent device | |
c8f7a62c | 98 | * |
f69cfdd2 | 99 | * Add the dependent device to the dock's dependent device list. |
c8f7a62c | 100 | */ |
f69cfdd2 AC |
101 | static int |
102 | add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
c8f7a62c LB |
103 | { |
104 | struct dock_dependent_device *dd; | |
105 | ||
106 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
f69cfdd2 AC |
107 | if (!dd) |
108 | return -ENOMEM; | |
109 | ||
110 | dd->handle = handle; | |
111 | INIT_LIST_HEAD(&dd->list); | |
112 | INIT_LIST_HEAD(&dd->hotplug_list); | |
c8f7a62c | 113 | |
c8f7a62c LB |
114 | spin_lock(&ds->dd_lock); |
115 | list_add_tail(&dd->list, &ds->dependent_devices); | |
116 | spin_unlock(&ds->dd_lock); | |
f69cfdd2 AC |
117 | |
118 | return 0; | |
c8f7a62c LB |
119 | } |
120 | ||
121 | /** | |
122 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
123 | * @ds: The dock station | |
124 | * @dd: The dependent device struct | |
125 | * | |
126 | * Add the dependent device to the dock's hotplug device list | |
127 | */ | |
128 | static void | |
129 | dock_add_hotplug_device(struct dock_station *ds, | |
130 | struct dock_dependent_device *dd) | |
131 | { | |
8b0dc866 | 132 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 133 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
8b0dc866 | 134 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
135 | } |
136 | ||
137 | /** | |
138 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
139 | * @ds: The dock station | |
140 | * @dd: the dependent device struct | |
141 | * | |
142 | * Delete the dependent device from the dock's hotplug device list | |
143 | */ | |
144 | static void | |
145 | dock_del_hotplug_device(struct dock_station *ds, | |
146 | struct dock_dependent_device *dd) | |
147 | { | |
8b0dc866 | 148 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 149 | list_del(&dd->hotplug_list); |
8b0dc866 | 150 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
151 | } |
152 | ||
153 | /** | |
154 | * find_dock_dependent_device - get a device dependent on this dock | |
155 | * @ds: the dock station | |
156 | * @handle: the acpi_handle of the device we want | |
157 | * | |
158 | * iterate over the dependent device list for this dock. If the | |
159 | * dependent device matches the handle, return. | |
160 | */ | |
161 | static struct dock_dependent_device * | |
162 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
163 | { | |
164 | struct dock_dependent_device *dd; | |
165 | ||
166 | spin_lock(&ds->dd_lock); | |
167 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
168 | if (handle == dd->handle) { | |
169 | spin_unlock(&ds->dd_lock); | |
170 | return dd; | |
171 | } | |
172 | } | |
173 | spin_unlock(&ds->dd_lock); | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | /***************************************************************************** | |
178 | * Dock functions * | |
179 | *****************************************************************************/ | |
180 | /** | |
181 | * is_dock - see if a device is a dock station | |
182 | * @handle: acpi handle of the device | |
183 | * | |
184 | * If an acpi object has a _DCK method, then it is by definition a dock | |
185 | * station, so return true. | |
186 | */ | |
187 | static int is_dock(acpi_handle handle) | |
188 | { | |
189 | acpi_status status; | |
190 | acpi_handle tmp; | |
191 | ||
192 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
193 | if (ACPI_FAILURE(status)) | |
194 | return 0; | |
195 | return 1; | |
196 | } | |
197 | ||
db350b08 SL |
198 | static int is_ejectable(acpi_handle handle) |
199 | { | |
200 | acpi_status status; | |
201 | acpi_handle tmp; | |
202 | ||
203 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
204 | if (ACPI_FAILURE(status)) | |
205 | return 0; | |
206 | return 1; | |
207 | } | |
208 | ||
209 | static int is_ata(acpi_handle handle) | |
210 | { | |
211 | acpi_handle tmp; | |
212 | ||
213 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || | |
214 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || | |
215 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || | |
216 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) | |
217 | return 1; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int is_battery(acpi_handle handle) | |
223 | { | |
224 | struct acpi_device_info *info; | |
db350b08 SL |
225 | int ret = 1; |
226 | ||
15b8dd53 | 227 | if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) |
db350b08 | 228 | return 0; |
db350b08 SL |
229 | if (!(info->valid & ACPI_VALID_HID)) |
230 | ret = 0; | |
231 | else | |
15b8dd53 | 232 | ret = !strcmp("PNP0C0A", info->hardware_id.string); |
db350b08 | 233 | |
15b8dd53 | 234 | kfree(info); |
db350b08 SL |
235 | return ret; |
236 | } | |
237 | ||
238 | static int is_ejectable_bay(acpi_handle handle) | |
239 | { | |
240 | acpi_handle phandle; | |
241 | if (!is_ejectable(handle)) | |
242 | return 0; | |
243 | if (is_battery(handle) || is_ata(handle)) | |
244 | return 1; | |
245 | if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) | |
246 | return 1; | |
247 | return 0; | |
248 | } | |
249 | ||
c8f7a62c LB |
250 | /** |
251 | * is_dock_device - see if a device is on a dock station | |
252 | * @handle: acpi handle of the device | |
253 | * | |
254 | * If this device is either the dock station itself, | |
255 | * or is a device dependent on the dock station, then it | |
256 | * is a dock device | |
257 | */ | |
258 | int is_dock_device(acpi_handle handle) | |
259 | { | |
db350b08 SL |
260 | struct dock_station *dock_station; |
261 | ||
262 | if (!dock_station_count) | |
c8f7a62c LB |
263 | return 0; |
264 | ||
db350b08 | 265 | if (is_dock(handle)) |
c8f7a62c | 266 | return 1; |
50d716e4 | 267 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
db350b08 SL |
268 | if (find_dock_dependent_device(dock_station, handle)) |
269 | return 1; | |
270 | } | |
c8f7a62c LB |
271 | |
272 | return 0; | |
273 | } | |
274 | ||
275 | EXPORT_SYMBOL_GPL(is_dock_device); | |
276 | ||
277 | /** | |
278 | * dock_present - see if the dock station is present. | |
279 | * @ds: the dock station | |
280 | * | |
281 | * execute the _STA method. note that present does not | |
282 | * imply that we are docked. | |
283 | */ | |
284 | static int dock_present(struct dock_station *ds) | |
285 | { | |
27663c58 | 286 | unsigned long long sta; |
c8f7a62c LB |
287 | acpi_status status; |
288 | ||
289 | if (ds) { | |
290 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
291 | if (ACPI_SUCCESS(status) && sta) | |
292 | return 1; | |
293 | } | |
294 | return 0; | |
295 | } | |
296 | ||
297 | ||
298 | ||
299 | /** | |
300 | * dock_create_acpi_device - add new devices to acpi | |
301 | * @handle - handle of the device to add | |
302 | * | |
303 | * This function will create a new acpi_device for the given | |
304 | * handle if one does not exist already. This should cause | |
305 | * acpi to scan for drivers for the given devices, and call | |
306 | * matching driver's add routine. | |
307 | * | |
308 | * Returns a pointer to the acpi_device corresponding to the handle. | |
309 | */ | |
310 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
311 | { | |
312 | struct acpi_device *device = NULL; | |
313 | struct acpi_device *parent_device; | |
314 | acpi_handle parent; | |
315 | int ret; | |
316 | ||
317 | if (acpi_bus_get_device(handle, &device)) { | |
318 | /* | |
319 | * no device created for this object, | |
320 | * so we should create one. | |
321 | */ | |
322 | acpi_get_parent(handle, &parent); | |
323 | if (acpi_bus_get_device(parent, &parent_device)) | |
324 | parent_device = NULL; | |
325 | ||
326 | ret = acpi_bus_add(&device, parent_device, handle, | |
327 | ACPI_BUS_TYPE_DEVICE); | |
328 | if (ret) { | |
329 | pr_debug("error adding bus, %x\n", | |
330 | -ret); | |
331 | return NULL; | |
332 | } | |
333 | } | |
334 | return device; | |
335 | } | |
336 | ||
337 | /** | |
338 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
339 | * @handle - the handle of the device to remove | |
340 | * | |
341 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
342 | * driver to have it's remove routine called. | |
343 | */ | |
344 | static void dock_remove_acpi_device(acpi_handle handle) | |
345 | { | |
346 | struct acpi_device *device; | |
347 | int ret; | |
348 | ||
349 | if (!acpi_bus_get_device(handle, &device)) { | |
350 | ret = acpi_bus_trim(device, 1); | |
351 | if (ret) | |
352 | pr_debug("error removing bus, %x\n", -ret); | |
353 | } | |
354 | } | |
355 | ||
356 | ||
357 | /** | |
358 | * hotplug_dock_devices - insert or remove devices on the dock station | |
359 | * @ds: the dock station | |
360 | * @event: either bus check or eject request | |
361 | * | |
362 | * Some devices on the dock station need to have drivers called | |
363 | * to perform hotplug operations after a dock event has occurred. | |
364 | * Traverse the list of dock devices that have registered a | |
365 | * hotplug handler, and call the handler. | |
366 | */ | |
367 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
368 | { | |
369 | struct dock_dependent_device *dd; | |
370 | ||
8b0dc866 | 371 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
372 | |
373 | /* | |
374 | * First call driver specific hotplug functions | |
375 | */ | |
376 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { | |
1253f7aa SL |
377 | if (dd->ops && dd->ops->handler) |
378 | dd->ops->handler(dd->handle, event, dd->context); | |
c8f7a62c LB |
379 | } |
380 | ||
381 | /* | |
382 | * Now make sure that an acpi_device is created for each | |
383 | * dependent device, or removed if this is an eject request. | |
384 | * This will cause acpi_drivers to be stopped/started if they | |
385 | * exist | |
386 | */ | |
387 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
388 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
389 | dock_remove_acpi_device(dd->handle); | |
390 | else | |
391 | dock_create_acpi_device(dd->handle); | |
392 | } | |
8b0dc866 | 393 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
394 | } |
395 | ||
396 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
397 | { | |
db350b08 | 398 | struct device *dev = &ds->dock_device->dev; |
66b56821 | 399 | char event_string[13]; |
79a8f70b | 400 | char *envp[] = { event_string, NULL }; |
1253f7aa | 401 | struct dock_dependent_device *dd; |
79a8f70b KCA |
402 | |
403 | if (num == UNDOCK_EVENT) | |
66b56821 | 404 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 405 | else |
66b56821 | 406 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 407 | |
5669021e | 408 | /* |
8ea86e0b KCA |
409 | * Indicate that the status of the dock station has |
410 | * changed. | |
5669021e | 411 | */ |
1253f7aa SL |
412 | if (num == DOCK_EVENT) |
413 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
414 | ||
415 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) | |
416 | if (dd->ops && dd->ops->uevent) | |
417 | dd->ops->uevent(dd->handle, event, dd->context); | |
418 | if (num != DOCK_EVENT) | |
419 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
c8f7a62c LB |
420 | } |
421 | ||
422 | /** | |
423 | * eject_dock - respond to a dock eject request | |
424 | * @ds: the dock station | |
425 | * | |
426 | * This is called after _DCK is called, to execute the dock station's | |
427 | * _EJ0 method. | |
428 | */ | |
429 | static void eject_dock(struct dock_station *ds) | |
430 | { | |
431 | struct acpi_object_list arg_list; | |
432 | union acpi_object arg; | |
433 | acpi_status status; | |
434 | acpi_handle tmp; | |
435 | ||
436 | /* all dock devices should have _EJ0, but check anyway */ | |
437 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
438 | if (ACPI_FAILURE(status)) { | |
439 | pr_debug("No _EJ0 support for dock device\n"); | |
440 | return; | |
441 | } | |
442 | ||
443 | arg_list.count = 1; | |
444 | arg_list.pointer = &arg; | |
445 | arg.type = ACPI_TYPE_INTEGER; | |
446 | arg.integer.value = 1; | |
447 | ||
448 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
449 | &arg_list, NULL))) | |
450 | pr_debug("Failed to evaluate _EJ0!\n"); | |
451 | } | |
452 | ||
453 | /** | |
454 | * handle_dock - handle a dock event | |
455 | * @ds: the dock station | |
456 | * @dock: to dock, or undock - that is the question | |
457 | * | |
458 | * Execute the _DCK method in response to an acpi event | |
459 | */ | |
460 | static void handle_dock(struct dock_station *ds, int dock) | |
461 | { | |
462 | acpi_status status; | |
463 | struct acpi_object_list arg_list; | |
464 | union acpi_object arg; | |
465 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
466 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c LB |
467 | |
468 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
c8f7a62c | 469 | |
9254bc84 DT |
470 | printk(KERN_INFO PREFIX "%s - %s\n", |
471 | (char *)name_buffer.pointer, dock ? "docking" : "undocking"); | |
c8f7a62c LB |
472 | |
473 | /* _DCK method has one argument */ | |
474 | arg_list.count = 1; | |
475 | arg_list.pointer = &arg; | |
476 | arg.type = ACPI_TYPE_INTEGER; | |
477 | arg.integer.value = dock; | |
478 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 479 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
0a918a94 TR |
480 | ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" |
481 | " _DCK\n", (char *)name_buffer.pointer)); | |
482 | ||
c8f7a62c LB |
483 | kfree(buffer.pointer); |
484 | kfree(name_buffer.pointer); | |
485 | } | |
486 | ||
487 | static inline void dock(struct dock_station *ds) | |
488 | { | |
489 | handle_dock(ds, 1); | |
490 | } | |
491 | ||
492 | static inline void undock(struct dock_station *ds) | |
493 | { | |
494 | handle_dock(ds, 0); | |
495 | } | |
496 | ||
497 | static inline void begin_dock(struct dock_station *ds) | |
498 | { | |
499 | ds->flags |= DOCK_DOCKING; | |
500 | } | |
501 | ||
502 | static inline void complete_dock(struct dock_station *ds) | |
503 | { | |
504 | ds->flags &= ~(DOCK_DOCKING); | |
505 | ds->last_dock_time = jiffies; | |
506 | } | |
507 | ||
a0cd35fd KCA |
508 | static inline void begin_undock(struct dock_station *ds) |
509 | { | |
510 | ds->flags |= DOCK_UNDOCKING; | |
511 | } | |
512 | ||
513 | static inline void complete_undock(struct dock_station *ds) | |
514 | { | |
515 | ds->flags &= ~(DOCK_UNDOCKING); | |
516 | } | |
517 | ||
406f692d SL |
518 | static void dock_lock(struct dock_station *ds, int lock) |
519 | { | |
520 | struct acpi_object_list arg_list; | |
521 | union acpi_object arg; | |
522 | acpi_status status; | |
523 | ||
524 | arg_list.count = 1; | |
525 | arg_list.pointer = &arg; | |
526 | arg.type = ACPI_TYPE_INTEGER; | |
527 | arg.integer.value = !!lock; | |
528 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
529 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
530 | if (lock) | |
531 | printk(KERN_WARNING PREFIX "Locking device failed\n"); | |
532 | else | |
533 | printk(KERN_WARNING PREFIX "Unlocking device failed\n"); | |
534 | } | |
535 | } | |
536 | ||
c8f7a62c LB |
537 | /** |
538 | * dock_in_progress - see if we are in the middle of handling a dock event | |
539 | * @ds: the dock station | |
540 | * | |
541 | * Sometimes while docking, false dock events can be sent to the driver | |
542 | * because good connections aren't made or some other reason. Ignore these | |
543 | * if we are in the middle of doing something. | |
544 | */ | |
545 | static int dock_in_progress(struct dock_station *ds) | |
546 | { | |
547 | if ((ds->flags & DOCK_DOCKING) || | |
548 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
549 | return 1; | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /** | |
554 | * register_dock_notifier - add yourself to the dock notifier list | |
555 | * @nb: the callers notifier block | |
556 | * | |
557 | * If a driver wishes to be notified about dock events, they can | |
558 | * use this function to put a notifier block on the dock notifier list. | |
559 | * this notifier call chain will be called after a dock event, but | |
560 | * before hotplugging any new devices. | |
561 | */ | |
562 | int register_dock_notifier(struct notifier_block *nb) | |
563 | { | |
db350b08 | 564 | if (!dock_station_count) |
2548c06b PB |
565 | return -ENODEV; |
566 | ||
c8f7a62c LB |
567 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
568 | } | |
569 | ||
570 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
571 | ||
572 | /** | |
573 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
574 | * @nb: the callers notifier block | |
575 | */ | |
576 | void unregister_dock_notifier(struct notifier_block *nb) | |
577 | { | |
db350b08 | 578 | if (!dock_station_count) |
2548c06b PB |
579 | return; |
580 | ||
c8f7a62c LB |
581 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
582 | } | |
583 | ||
584 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
585 | ||
586 | /** | |
587 | * register_hotplug_dock_device - register a hotplug function | |
588 | * @handle: the handle of the device | |
1253f7aa | 589 | * @ops: handlers to call after docking |
c8f7a62c LB |
590 | * @context: device specific data |
591 | * | |
592 | * If a driver would like to perform a hotplug operation after a dock | |
593 | * event, they can register an acpi_notifiy_handler to be called by | |
594 | * the dock driver after _DCK is executed. | |
595 | */ | |
596 | int | |
1253f7aa | 597 | register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, |
c8f7a62c LB |
598 | void *context) |
599 | { | |
600 | struct dock_dependent_device *dd; | |
db350b08 | 601 | struct dock_station *dock_station; |
61b83695 | 602 | int ret = -EINVAL; |
c8f7a62c | 603 | |
db350b08 | 604 | if (!dock_station_count) |
c8f7a62c LB |
605 | return -ENODEV; |
606 | ||
607 | /* | |
608 | * make sure this handle is for a device dependent on the dock, | |
609 | * this would include the dock station itself | |
610 | */ | |
50d716e4 | 611 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
61b83695 SL |
612 | /* |
613 | * An ATA bay can be in a dock and itself can be ejected | |
614 | * seperately, so there are two 'dock stations' which need the | |
615 | * ops | |
616 | */ | |
db350b08 SL |
617 | dd = find_dock_dependent_device(dock_station, handle); |
618 | if (dd) { | |
1253f7aa | 619 | dd->ops = ops; |
db350b08 SL |
620 | dd->context = context; |
621 | dock_add_hotplug_device(dock_station, dd); | |
61b83695 | 622 | ret = 0; |
db350b08 | 623 | } |
c8f7a62c LB |
624 | } |
625 | ||
61b83695 | 626 | return ret; |
c8f7a62c LB |
627 | } |
628 | ||
629 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
630 | ||
631 | /** | |
632 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
633 | * @handle: the acpi handle of the device | |
634 | */ | |
635 | void unregister_hotplug_dock_device(acpi_handle handle) | |
636 | { | |
637 | struct dock_dependent_device *dd; | |
db350b08 | 638 | struct dock_station *dock_station; |
c8f7a62c | 639 | |
db350b08 | 640 | if (!dock_station_count) |
c8f7a62c LB |
641 | return; |
642 | ||
50d716e4 | 643 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
db350b08 SL |
644 | dd = find_dock_dependent_device(dock_station, handle); |
645 | if (dd) | |
646 | dock_del_hotplug_device(dock_station, dd); | |
647 | } | |
c8f7a62c LB |
648 | } |
649 | ||
650 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
651 | ||
c80fdbe8 | 652 | /** |
653 | * handle_eject_request - handle an undock request checking for error conditions | |
654 | * | |
655 | * Check to make sure the dock device is still present, then undock and | |
656 | * hotremove all the devices that may need removing. | |
657 | */ | |
658 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
659 | { | |
c80fdbe8 | 660 | if (dock_in_progress(ds)) |
661 | return -EBUSY; | |
662 | ||
663 | /* | |
664 | * here we need to generate the undock | |
665 | * event prior to actually doing the undock | |
666 | * so that the device struct still exists. | |
afd7301d HM |
667 | * Also, even send the dock event if the |
668 | * device is not present anymore | |
c80fdbe8 | 669 | */ |
670 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 671 | |
c80fdbe8 | 672 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
673 | undock(ds); | |
406f692d | 674 | dock_lock(ds, 0); |
c80fdbe8 | 675 | eject_dock(ds); |
676 | if (dock_present(ds)) { | |
677 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
678 | return -EBUSY; | |
679 | } | |
a0cd35fd | 680 | complete_undock(ds); |
c80fdbe8 | 681 | return 0; |
682 | } | |
683 | ||
c8f7a62c LB |
684 | /** |
685 | * dock_notify - act upon an acpi dock notification | |
686 | * @handle: the dock station handle | |
687 | * @event: the acpi event | |
688 | * @data: our driver data struct | |
689 | * | |
690 | * If we are notified to dock, then check to see if the dock is | |
691 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 692 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
693 | */ |
694 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
695 | { | |
50dd0969 | 696 | struct dock_station *ds = data; |
8b59560a | 697 | struct acpi_device *tmp; |
db350b08 | 698 | int surprise_removal = 0; |
c8f7a62c | 699 | |
db350b08 SL |
700 | /* |
701 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
702 | * is sent and _DCK is present, it is assumed to mean an undock | |
703 | * request. | |
704 | */ | |
705 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
706 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
707 | ||
708 | /* | |
709 | * dock station: BUS_CHECK - docked or surprise removal | |
710 | * DEVICE_CHECK - undocked | |
711 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
712 | * | |
713 | * To simplify event handling, dock dependent device handler always | |
714 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
715 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
716 | */ | |
c8f7a62c LB |
717 | switch (event) { |
718 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 719 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
720 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
721 | &tmp)) { | |
c8f7a62c LB |
722 | begin_dock(ds); |
723 | dock(ds); | |
724 | if (!dock_present(ds)) { | |
725 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
8b59560a | 726 | complete_dock(ds); |
c8f7a62c LB |
727 | break; |
728 | } | |
729 | atomic_notifier_call_chain(&dock_notifier_list, | |
730 | event, NULL); | |
731 | hotplug_dock_devices(ds, event); | |
732 | complete_dock(ds); | |
733 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 734 | dock_lock(ds, 1); |
db350b08 | 735 | break; |
c8f7a62c | 736 | } |
db350b08 SL |
737 | if (dock_present(ds) || dock_in_progress(ds)) |
738 | break; | |
739 | /* This is a surprise removal */ | |
740 | surprise_removal = 1; | |
741 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
742 | /* Fall back */ | |
c8f7a62c | 743 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 744 | begin_undock(ds); |
f730ae18 SL |
745 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
746 | || surprise_removal) | |
a0cd35fd KCA |
747 | handle_eject_request(ds, event); |
748 | else | |
749 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
750 | break; |
751 | default: | |
752 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
753 | } | |
754 | } | |
755 | ||
19cd847a ZR |
756 | struct dock_data { |
757 | acpi_handle handle; | |
758 | unsigned long event; | |
759 | struct dock_station *ds; | |
760 | }; | |
761 | ||
762 | static void acpi_dock_deferred_cb(void *context) | |
763 | { | |
764 | struct dock_data *data = (struct dock_data *)context; | |
765 | ||
766 | dock_notify(data->handle, data->event, data->ds); | |
767 | kfree(data); | |
768 | } | |
769 | ||
6bd00a61 SL |
770 | static int acpi_dock_notifier_call(struct notifier_block *this, |
771 | unsigned long event, void *data) | |
772 | { | |
773 | struct dock_station *dock_station; | |
774 | acpi_handle handle = (acpi_handle)data; | |
775 | ||
776 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
777 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
778 | return 0; | |
50d716e4 | 779 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
6bd00a61 | 780 | if (dock_station->handle == handle) { |
19cd847a ZR |
781 | struct dock_data *dock_data; |
782 | ||
783 | dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL); | |
784 | if (!dock_data) | |
785 | return 0; | |
786 | dock_data->handle = handle; | |
787 | dock_data->event = event; | |
788 | dock_data->ds = dock_station; | |
789 | acpi_os_hotplug_execute(acpi_dock_deferred_cb, | |
790 | dock_data); | |
6bd00a61 SL |
791 | return 0 ; |
792 | } | |
793 | } | |
794 | return 0; | |
795 | } | |
796 | ||
797 | static struct notifier_block dock_acpi_notifier = { | |
798 | .notifier_call = acpi_dock_notifier_call, | |
799 | }; | |
800 | ||
c8f7a62c LB |
801 | /** |
802 | * find_dock_devices - find devices on the dock station | |
803 | * @handle: the handle of the device we are examining | |
804 | * @lvl: unused | |
805 | * @context: the dock station private data | |
806 | * @rv: unused | |
807 | * | |
808 | * This function is called by acpi_walk_namespace. It will | |
809 | * check to see if an object has an _EJD method. If it does, then it | |
810 | * will see if it is dependent on the dock station. | |
811 | */ | |
812 | static acpi_status | |
813 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
814 | { | |
815 | acpi_status status; | |
fe9a2f77 | 816 | acpi_handle tmp, parent; |
50dd0969 | 817 | struct dock_station *ds = context; |
c8f7a62c LB |
818 | |
819 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
820 | if (ACPI_FAILURE(status)) { |
821 | /* try the parent device as well */ | |
822 | status = acpi_get_parent(handle, &parent); | |
823 | if (ACPI_FAILURE(status)) | |
824 | goto fdd_out; | |
825 | /* see if parent is dependent on dock */ | |
826 | status = acpi_bus_get_ejd(parent, &tmp); | |
827 | if (ACPI_FAILURE(status)) | |
828 | goto fdd_out; | |
829 | } | |
c8f7a62c | 830 | |
f69cfdd2 AC |
831 | if (tmp == ds->handle) |
832 | add_dock_dependent_device(ds, handle); | |
833 | ||
fe9a2f77 | 834 | fdd_out: |
c8f7a62c LB |
835 | return AE_OK; |
836 | } | |
837 | ||
c80fdbe8 | 838 | /* |
839 | * show_docked - read method for "docked" file in sysfs | |
840 | */ | |
841 | static ssize_t show_docked(struct device *dev, | |
842 | struct device_attribute *attr, char *buf) | |
843 | { | |
fc5a9f88 HM |
844 | struct acpi_device *tmp; |
845 | ||
fe06fba2 | 846 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 847 | |
fc5a9f88 HM |
848 | if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) |
849 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
850 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
c80fdbe8 | 851 | } |
e5685b9d | 852 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 853 | |
a0cd35fd KCA |
854 | /* |
855 | * show_flags - read method for flags file in sysfs | |
856 | */ | |
857 | static ssize_t show_flags(struct device *dev, | |
858 | struct device_attribute *attr, char *buf) | |
859 | { | |
fe06fba2 | 860 | struct dock_station *dock_station = dev->platform_data; |
a0cd35fd KCA |
861 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
862 | ||
863 | } | |
e5685b9d | 864 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 865 | |
c80fdbe8 | 866 | /* |
867 | * write_undock - write method for "undock" file in sysfs | |
868 | */ | |
869 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
870 | const char *buf, size_t count) | |
871 | { | |
872 | int ret; | |
fe06fba2 | 873 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 874 | |
875 | if (!count) | |
876 | return -EINVAL; | |
877 | ||
9171f834 | 878 | begin_undock(dock_station); |
c80fdbe8 | 879 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
880 | return ret ? ret: count; | |
881 | } | |
e5685b9d | 882 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 883 | |
ac122bb6 IVE |
884 | /* |
885 | * show_dock_uid - read method for "uid" file in sysfs | |
886 | */ | |
887 | static ssize_t show_dock_uid(struct device *dev, | |
888 | struct device_attribute *attr, char *buf) | |
889 | { | |
27663c58 | 890 | unsigned long long lbuf; |
fe06fba2 | 891 | struct dock_station *dock_station = dev->platform_data; |
38ff4ffc KCA |
892 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
893 | "_UID", NULL, &lbuf); | |
894 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 895 | return 0; |
38ff4ffc | 896 | |
27663c58 | 897 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
ac122bb6 | 898 | } |
e5685b9d | 899 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 900 | |
8652b00f SL |
901 | static ssize_t show_dock_type(struct device *dev, |
902 | struct device_attribute *attr, char *buf) | |
903 | { | |
fe06fba2 | 904 | struct dock_station *dock_station = dev->platform_data; |
8652b00f SL |
905 | char *type; |
906 | ||
907 | if (dock_station->flags & DOCK_IS_DOCK) | |
908 | type = "dock_station"; | |
909 | else if (dock_station->flags & DOCK_IS_ATA) | |
910 | type = "ata_bay"; | |
911 | else if (dock_station->flags & DOCK_IS_BAT) | |
912 | type = "battery_bay"; | |
913 | else | |
914 | type = "unknown"; | |
915 | ||
916 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
917 | } | |
918 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); | |
919 | ||
5f46c2f2 AC |
920 | static struct attribute *dock_attributes[] = { |
921 | &dev_attr_docked.attr, | |
922 | &dev_attr_flags.attr, | |
923 | &dev_attr_undock.attr, | |
924 | &dev_attr_uid.attr, | |
925 | &dev_attr_type.attr, | |
926 | NULL | |
927 | }; | |
928 | ||
929 | static struct attribute_group dock_attribute_group = { | |
930 | .attrs = dock_attributes | |
931 | }; | |
932 | ||
c8f7a62c LB |
933 | /** |
934 | * dock_add - add a new dock station | |
935 | * @handle: the dock station handle | |
936 | * | |
937 | * allocated and initialize a new dock station device. Find all devices | |
938 | * that are on the dock station, and register for dock event notifications. | |
939 | */ | |
940 | static int dock_add(acpi_handle handle) | |
941 | { | |
fe06fba2 AC |
942 | int ret, id; |
943 | struct dock_station ds, *dock_station; | |
db350b08 | 944 | struct platform_device *dock_device; |
c8f7a62c | 945 | |
fe06fba2 | 946 | id = dock_station_count; |
9751cb72 | 947 | dock_device = |
fe06fba2 AC |
948 | platform_device_register_data(NULL, "dock", |
949 | id, &ds, sizeof(ds)); | |
9751cb72 AC |
950 | if (IS_ERR(dock_device)) |
951 | return PTR_ERR(dock_device); | |
952 | ||
fe06fba2 | 953 | dock_station = dock_device->dev.platform_data; |
c8f7a62c | 954 | dock_station->handle = handle; |
9751cb72 | 955 | dock_station->dock_device = dock_device; |
c8f7a62c LB |
956 | dock_station->last_dock_time = jiffies - HZ; |
957 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
958 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
50d716e4 | 959 | INIT_LIST_HEAD(&dock_station->sibling); |
c8f7a62c | 960 | spin_lock_init(&dock_station->dd_lock); |
8b0dc866 | 961 | mutex_init(&dock_station->hp_lock); |
07a18684 | 962 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c | 963 | |
9ef2a9a9 | 964 | /* we want the dock device to send uevents */ |
f67f129e | 965 | dev_set_uevent_suppress(&dock_device->dev, 0); |
9ef2a9a9 | 966 | |
db350b08 SL |
967 | if (is_dock(handle)) |
968 | dock_station->flags |= DOCK_IS_DOCK; | |
969 | if (is_ata(handle)) | |
970 | dock_station->flags |= DOCK_IS_ATA; | |
971 | if (is_battery(handle)) | |
972 | dock_station->flags |= DOCK_IS_BAT; | |
973 | ||
5f46c2f2 | 974 | ret = sysfs_create_group(&dock_device->dev.kobj, &dock_attribute_group); |
8652b00f | 975 | if (ret) |
5f46c2f2 | 976 | goto err_unregister; |
671adbec | 977 | |
c8f7a62c LB |
978 | /* Find dependent devices */ |
979 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
980 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
981 | NULL); | |
982 | ||
983 | /* add the dock station as a device dependent on itself */ | |
f69cfdd2 AC |
984 | ret = add_dock_dependent_device(dock_station, handle); |
985 | if (ret) | |
5f46c2f2 | 986 | goto err_rmgroup; |
c8f7a62c | 987 | |
db350b08 | 988 | dock_station_count++; |
50d716e4 | 989 | list_add(&dock_station->sibling, &dock_stations); |
c8f7a62c LB |
990 | return 0; |
991 | ||
5f46c2f2 AC |
992 | err_rmgroup: |
993 | sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group); | |
994 | err_unregister: | |
0f6f2804 | 995 | platform_device_unregister(dock_device); |
5f46c2f2 | 996 | printk(KERN_ERR "%s encountered error %d\n", __func__, ret); |
c8f7a62c LB |
997 | return ret; |
998 | } | |
999 | ||
1000 | /** | |
1001 | * dock_remove - free up resources related to the dock station | |
1002 | */ | |
db350b08 | 1003 | static int dock_remove(struct dock_station *dock_station) |
c8f7a62c LB |
1004 | { |
1005 | struct dock_dependent_device *dd, *tmp; | |
db350b08 | 1006 | struct platform_device *dock_device = dock_station->dock_device; |
c8f7a62c | 1007 | |
db350b08 | 1008 | if (!dock_station_count) |
c8f7a62c LB |
1009 | return 0; |
1010 | ||
1011 | /* remove dependent devices */ | |
1012 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
1013 | list) | |
1014 | kfree(dd); | |
1015 | ||
fe06fba2 AC |
1016 | list_del(&dock_station->sibling); |
1017 | ||
671adbec | 1018 | /* cleanup sysfs */ |
5f46c2f2 | 1019 | sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group); |
0f6f2804 | 1020 | platform_device_unregister(dock_device); |
671adbec | 1021 | |
c8f7a62c LB |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * find_dock - look for a dock station | |
1027 | * @handle: acpi handle of a device | |
1028 | * @lvl: unused | |
1029 | * @context: counter of dock stations found | |
1030 | * @rv: unused | |
1031 | * | |
1032 | * This is called by acpi_walk_namespace to look for dock stations. | |
1033 | */ | |
1034 | static acpi_status | |
1035 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
1036 | { | |
c8f7a62c LB |
1037 | acpi_status status = AE_OK; |
1038 | ||
1039 | if (is_dock(handle)) { | |
1040 | if (dock_add(handle) >= 0) { | |
c8f7a62c LB |
1041 | status = AE_CTRL_TERMINATE; |
1042 | } | |
1043 | } | |
1044 | return status; | |
1045 | } | |
1046 | ||
db350b08 SL |
1047 | static acpi_status |
1048 | find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) | |
c8f7a62c | 1049 | { |
61b83695 SL |
1050 | /* If bay is a dock, it's already handled */ |
1051 | if (is_ejectable_bay(handle) && !is_dock(handle)) | |
db350b08 SL |
1052 | dock_add(handle); |
1053 | return AE_OK; | |
1054 | } | |
c8f7a62c | 1055 | |
db350b08 SL |
1056 | static int __init dock_init(void) |
1057 | { | |
816c2eda LB |
1058 | if (acpi_disabled) |
1059 | return 0; | |
1060 | ||
c8f7a62c LB |
1061 | /* look for a dock station */ |
1062 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
db350b08 | 1063 | ACPI_UINT32_MAX, find_dock, NULL, NULL); |
c8f7a62c | 1064 | |
db350b08 SL |
1065 | /* look for bay */ |
1066 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1067 | ACPI_UINT32_MAX, find_bay, NULL, NULL); | |
1068 | if (!dock_station_count) { | |
1069 | printk(KERN_INFO PREFIX "No dock devices found.\n"); | |
1070 | return 0; | |
1071 | } | |
c8f7a62c | 1072 | |
6bd00a61 | 1073 | register_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1074 | printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
1075 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); | |
c8f7a62c LB |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | static void __exit dock_exit(void) | |
1080 | { | |
db350b08 | 1081 | struct dock_station *dock_station; |
f2407298 | 1082 | struct dock_station *tmp; |
db350b08 | 1083 | |
6bd00a61 | 1084 | unregister_acpi_bus_notifier(&dock_acpi_notifier); |
50d716e4 | 1085 | list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling) |
db350b08 | 1086 | dock_remove(dock_station); |
c8f7a62c LB |
1087 | } |
1088 | ||
db350b08 SL |
1089 | /* |
1090 | * Must be called before drivers of devices in dock, otherwise we can't know | |
1091 | * which devices are in a dock | |
1092 | */ | |
1093 | subsys_initcall(dock_init); | |
c8f7a62c | 1094 | module_exit(dock_exit); |