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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 | ||
7cda93e0 | 36 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
c8f7a62c | 37 | |
f52fd66d | 38 | ACPI_MODULE_NAME("dock"); |
c8f7a62c | 39 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
7cda93e0 | 40 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
41 | MODULE_LICENSE("GPL"); |
42 | ||
a0cd35fd KCA |
43 | static int immediate_undock = 1; |
44 | module_param(immediate_undock, bool, 0644); | |
45 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " | |
46 | "undock immediately when the undock button is pressed, 0 will cause" | |
47 | " the driver to wait for userspace to write the undock sysfs file " | |
48 | " before undocking"); | |
49 | ||
c8f7a62c | 50 | static struct atomic_notifier_head dock_notifier_list; |
671adbec | 51 | static char dock_device_name[] = "dock"; |
c8f7a62c | 52 | |
a340af14 FS |
53 | static const struct acpi_device_id dock_device_ids[] = { |
54 | {"LNXDOCK", 0}, | |
55 | {"", 0}, | |
56 | }; | |
57 | MODULE_DEVICE_TABLE(acpi, dock_device_ids); | |
58 | ||
c8f7a62c LB |
59 | struct dock_station { |
60 | acpi_handle handle; | |
61 | unsigned long last_dock_time; | |
62 | u32 flags; | |
63 | spinlock_t dd_lock; | |
8b0dc866 | 64 | struct mutex hp_lock; |
c8f7a62c LB |
65 | struct list_head dependent_devices; |
66 | struct list_head hotplug_devices; | |
db350b08 SL |
67 | |
68 | struct list_head sibiling; | |
69 | struct platform_device *dock_device; | |
c8f7a62c | 70 | }; |
db350b08 SL |
71 | static LIST_HEAD(dock_stations); |
72 | static int dock_station_count; | |
c8f7a62c LB |
73 | |
74 | struct dock_dependent_device { | |
75 | struct list_head list; | |
76 | struct list_head hotplug_list; | |
77 | acpi_handle handle; | |
78 | acpi_notify_handler handler; | |
79 | void *context; | |
80 | }; | |
81 | ||
82 | #define DOCK_DOCKING 0x00000001 | |
a0cd35fd | 83 | #define DOCK_UNDOCKING 0x00000002 |
db350b08 SL |
84 | #define DOCK_IS_DOCK 0x00000010 |
85 | #define DOCK_IS_ATA 0x00000020 | |
86 | #define DOCK_IS_BAT 0x00000040 | |
5669021e KCA |
87 | #define DOCK_EVENT 3 |
88 | #define UNDOCK_EVENT 2 | |
c8f7a62c | 89 | |
c8f7a62c LB |
90 | /***************************************************************************** |
91 | * Dock Dependent device functions * | |
92 | *****************************************************************************/ | |
93 | /** | |
94 | * alloc_dock_dependent_device - allocate and init a dependent device | |
95 | * @handle: the acpi_handle of the dependent device | |
96 | * | |
97 | * Allocate memory for a dependent device structure for a device referenced | |
98 | * by the acpi handle | |
99 | */ | |
100 | static struct dock_dependent_device * | |
101 | alloc_dock_dependent_device(acpi_handle handle) | |
102 | { | |
103 | struct dock_dependent_device *dd; | |
104 | ||
105 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
106 | if (dd) { | |
107 | dd->handle = handle; | |
108 | INIT_LIST_HEAD(&dd->list); | |
109 | INIT_LIST_HEAD(&dd->hotplug_list); | |
110 | } | |
111 | return dd; | |
112 | } | |
113 | ||
114 | /** | |
115 | * add_dock_dependent_device - associate a device with the dock station | |
116 | * @ds: The dock station | |
117 | * @dd: The dependent device | |
118 | * | |
119 | * Add the dependent device to the dock's dependent device list. | |
120 | */ | |
121 | static void | |
122 | add_dock_dependent_device(struct dock_station *ds, | |
123 | struct dock_dependent_device *dd) | |
124 | { | |
125 | spin_lock(&ds->dd_lock); | |
126 | list_add_tail(&dd->list, &ds->dependent_devices); | |
127 | spin_unlock(&ds->dd_lock); | |
128 | } | |
129 | ||
130 | /** | |
131 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
132 | * @ds: The dock station | |
133 | * @dd: The dependent device struct | |
134 | * | |
135 | * Add the dependent device to the dock's hotplug device list | |
136 | */ | |
137 | static void | |
138 | dock_add_hotplug_device(struct dock_station *ds, | |
139 | struct dock_dependent_device *dd) | |
140 | { | |
8b0dc866 | 141 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 142 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
8b0dc866 | 143 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
144 | } |
145 | ||
146 | /** | |
147 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
148 | * @ds: The dock station | |
149 | * @dd: the dependent device struct | |
150 | * | |
151 | * Delete the dependent device from the dock's hotplug device list | |
152 | */ | |
153 | static void | |
154 | dock_del_hotplug_device(struct dock_station *ds, | |
155 | struct dock_dependent_device *dd) | |
156 | { | |
8b0dc866 | 157 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 158 | list_del(&dd->hotplug_list); |
8b0dc866 | 159 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
160 | } |
161 | ||
162 | /** | |
163 | * find_dock_dependent_device - get a device dependent on this dock | |
164 | * @ds: the dock station | |
165 | * @handle: the acpi_handle of the device we want | |
166 | * | |
167 | * iterate over the dependent device list for this dock. If the | |
168 | * dependent device matches the handle, return. | |
169 | */ | |
170 | static struct dock_dependent_device * | |
171 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
172 | { | |
173 | struct dock_dependent_device *dd; | |
174 | ||
175 | spin_lock(&ds->dd_lock); | |
176 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
177 | if (handle == dd->handle) { | |
178 | spin_unlock(&ds->dd_lock); | |
179 | return dd; | |
180 | } | |
181 | } | |
182 | spin_unlock(&ds->dd_lock); | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | /***************************************************************************** | |
187 | * Dock functions * | |
188 | *****************************************************************************/ | |
189 | /** | |
190 | * is_dock - see if a device is a dock station | |
191 | * @handle: acpi handle of the device | |
192 | * | |
193 | * If an acpi object has a _DCK method, then it is by definition a dock | |
194 | * station, so return true. | |
195 | */ | |
196 | static int is_dock(acpi_handle handle) | |
197 | { | |
198 | acpi_status status; | |
199 | acpi_handle tmp; | |
200 | ||
201 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
202 | if (ACPI_FAILURE(status)) | |
203 | return 0; | |
204 | return 1; | |
205 | } | |
206 | ||
db350b08 SL |
207 | static int is_ejectable(acpi_handle handle) |
208 | { | |
209 | acpi_status status; | |
210 | acpi_handle tmp; | |
211 | ||
212 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
213 | if (ACPI_FAILURE(status)) | |
214 | return 0; | |
215 | return 1; | |
216 | } | |
217 | ||
218 | static int is_ata(acpi_handle handle) | |
219 | { | |
220 | acpi_handle tmp; | |
221 | ||
222 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || | |
223 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || | |
224 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || | |
225 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) | |
226 | return 1; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int is_battery(acpi_handle handle) | |
232 | { | |
233 | struct acpi_device_info *info; | |
234 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
235 | int ret = 1; | |
236 | ||
237 | if (!ACPI_SUCCESS(acpi_get_object_info(handle, &buffer))) | |
238 | return 0; | |
239 | info = buffer.pointer; | |
240 | if (!(info->valid & ACPI_VALID_HID)) | |
241 | ret = 0; | |
242 | else | |
243 | ret = !strcmp("PNP0C0A", info->hardware_id.value); | |
244 | ||
245 | kfree(buffer.pointer); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | static int is_ejectable_bay(acpi_handle handle) | |
250 | { | |
251 | acpi_handle phandle; | |
252 | if (!is_ejectable(handle)) | |
253 | return 0; | |
254 | if (is_battery(handle) || is_ata(handle)) | |
255 | return 1; | |
256 | if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) | |
257 | return 1; | |
258 | return 0; | |
259 | } | |
260 | ||
c8f7a62c LB |
261 | /** |
262 | * is_dock_device - see if a device is on a dock station | |
263 | * @handle: acpi handle of the device | |
264 | * | |
265 | * If this device is either the dock station itself, | |
266 | * or is a device dependent on the dock station, then it | |
267 | * is a dock device | |
268 | */ | |
269 | int is_dock_device(acpi_handle handle) | |
270 | { | |
db350b08 SL |
271 | struct dock_station *dock_station; |
272 | ||
273 | if (!dock_station_count) | |
c8f7a62c LB |
274 | return 0; |
275 | ||
db350b08 | 276 | if (is_dock(handle)) |
c8f7a62c | 277 | return 1; |
db350b08 SL |
278 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
279 | if (find_dock_dependent_device(dock_station, handle)) | |
280 | return 1; | |
281 | } | |
c8f7a62c LB |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
286 | EXPORT_SYMBOL_GPL(is_dock_device); | |
287 | ||
288 | /** | |
289 | * dock_present - see if the dock station is present. | |
290 | * @ds: the dock station | |
291 | * | |
292 | * execute the _STA method. note that present does not | |
293 | * imply that we are docked. | |
294 | */ | |
295 | static int dock_present(struct dock_station *ds) | |
296 | { | |
297 | unsigned long sta; | |
298 | acpi_status status; | |
299 | ||
300 | if (ds) { | |
301 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
302 | if (ACPI_SUCCESS(status) && sta) | |
303 | return 1; | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
308 | ||
309 | ||
310 | /** | |
311 | * dock_create_acpi_device - add new devices to acpi | |
312 | * @handle - handle of the device to add | |
313 | * | |
314 | * This function will create a new acpi_device for the given | |
315 | * handle if one does not exist already. This should cause | |
316 | * acpi to scan for drivers for the given devices, and call | |
317 | * matching driver's add routine. | |
318 | * | |
319 | * Returns a pointer to the acpi_device corresponding to the handle. | |
320 | */ | |
321 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
322 | { | |
323 | struct acpi_device *device = NULL; | |
324 | struct acpi_device *parent_device; | |
325 | acpi_handle parent; | |
326 | int ret; | |
327 | ||
328 | if (acpi_bus_get_device(handle, &device)) { | |
329 | /* | |
330 | * no device created for this object, | |
331 | * so we should create one. | |
332 | */ | |
333 | acpi_get_parent(handle, &parent); | |
334 | if (acpi_bus_get_device(parent, &parent_device)) | |
335 | parent_device = NULL; | |
336 | ||
337 | ret = acpi_bus_add(&device, parent_device, handle, | |
338 | ACPI_BUS_TYPE_DEVICE); | |
339 | if (ret) { | |
340 | pr_debug("error adding bus, %x\n", | |
341 | -ret); | |
342 | return NULL; | |
343 | } | |
344 | } | |
345 | return device; | |
346 | } | |
347 | ||
348 | /** | |
349 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
350 | * @handle - the handle of the device to remove | |
351 | * | |
352 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
353 | * driver to have it's remove routine called. | |
354 | */ | |
355 | static void dock_remove_acpi_device(acpi_handle handle) | |
356 | { | |
357 | struct acpi_device *device; | |
358 | int ret; | |
359 | ||
360 | if (!acpi_bus_get_device(handle, &device)) { | |
361 | ret = acpi_bus_trim(device, 1); | |
362 | if (ret) | |
363 | pr_debug("error removing bus, %x\n", -ret); | |
364 | } | |
365 | } | |
366 | ||
367 | ||
368 | /** | |
369 | * hotplug_dock_devices - insert or remove devices on the dock station | |
370 | * @ds: the dock station | |
371 | * @event: either bus check or eject request | |
372 | * | |
373 | * Some devices on the dock station need to have drivers called | |
374 | * to perform hotplug operations after a dock event has occurred. | |
375 | * Traverse the list of dock devices that have registered a | |
376 | * hotplug handler, and call the handler. | |
377 | */ | |
378 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
379 | { | |
380 | struct dock_dependent_device *dd; | |
381 | ||
8b0dc866 | 382 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
383 | |
384 | /* | |
385 | * First call driver specific hotplug functions | |
386 | */ | |
387 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { | |
388 | if (dd->handler) | |
389 | dd->handler(dd->handle, event, dd->context); | |
390 | } | |
391 | ||
392 | /* | |
393 | * Now make sure that an acpi_device is created for each | |
394 | * dependent device, or removed if this is an eject request. | |
395 | * This will cause acpi_drivers to be stopped/started if they | |
396 | * exist | |
397 | */ | |
398 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
399 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
400 | dock_remove_acpi_device(dd->handle); | |
401 | else | |
402 | dock_create_acpi_device(dd->handle); | |
403 | } | |
8b0dc866 | 404 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
405 | } |
406 | ||
407 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
408 | { | |
db350b08 | 409 | struct device *dev = &ds->dock_device->dev; |
66b56821 | 410 | char event_string[13]; |
79a8f70b KCA |
411 | char *envp[] = { event_string, NULL }; |
412 | ||
413 | if (num == UNDOCK_EVENT) | |
66b56821 | 414 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 415 | else |
66b56821 | 416 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 417 | |
5669021e | 418 | /* |
8ea86e0b KCA |
419 | * Indicate that the status of the dock station has |
420 | * changed. | |
5669021e | 421 | */ |
79a8f70b | 422 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
c8f7a62c LB |
423 | } |
424 | ||
425 | /** | |
426 | * eject_dock - respond to a dock eject request | |
427 | * @ds: the dock station | |
428 | * | |
429 | * This is called after _DCK is called, to execute the dock station's | |
430 | * _EJ0 method. | |
431 | */ | |
432 | static void eject_dock(struct dock_station *ds) | |
433 | { | |
434 | struct acpi_object_list arg_list; | |
435 | union acpi_object arg; | |
436 | acpi_status status; | |
437 | acpi_handle tmp; | |
438 | ||
439 | /* all dock devices should have _EJ0, but check anyway */ | |
440 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
441 | if (ACPI_FAILURE(status)) { | |
442 | pr_debug("No _EJ0 support for dock device\n"); | |
443 | return; | |
444 | } | |
445 | ||
446 | arg_list.count = 1; | |
447 | arg_list.pointer = &arg; | |
448 | arg.type = ACPI_TYPE_INTEGER; | |
449 | arg.integer.value = 1; | |
450 | ||
451 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
452 | &arg_list, NULL))) | |
453 | pr_debug("Failed to evaluate _EJ0!\n"); | |
454 | } | |
455 | ||
456 | /** | |
457 | * handle_dock - handle a dock event | |
458 | * @ds: the dock station | |
459 | * @dock: to dock, or undock - that is the question | |
460 | * | |
461 | * Execute the _DCK method in response to an acpi event | |
462 | */ | |
463 | static void handle_dock(struct dock_station *ds, int dock) | |
464 | { | |
465 | acpi_status status; | |
466 | struct acpi_object_list arg_list; | |
467 | union acpi_object arg; | |
468 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
469 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c LB |
470 | |
471 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
c8f7a62c | 472 | |
9254bc84 DT |
473 | printk(KERN_INFO PREFIX "%s - %s\n", |
474 | (char *)name_buffer.pointer, dock ? "docking" : "undocking"); | |
c8f7a62c LB |
475 | |
476 | /* _DCK method has one argument */ | |
477 | arg_list.count = 1; | |
478 | arg_list.pointer = &arg; | |
479 | arg.type = ACPI_TYPE_INTEGER; | |
480 | arg.integer.value = dock; | |
481 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 482 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
9254bc84 DT |
483 | printk(KERN_ERR PREFIX "%s - failed to execute _DCK\n", |
484 | (char *)name_buffer.pointer); | |
c8f7a62c LB |
485 | kfree(buffer.pointer); |
486 | kfree(name_buffer.pointer); | |
487 | } | |
488 | ||
489 | static inline void dock(struct dock_station *ds) | |
490 | { | |
491 | handle_dock(ds, 1); | |
492 | } | |
493 | ||
494 | static inline void undock(struct dock_station *ds) | |
495 | { | |
496 | handle_dock(ds, 0); | |
497 | } | |
498 | ||
499 | static inline void begin_dock(struct dock_station *ds) | |
500 | { | |
501 | ds->flags |= DOCK_DOCKING; | |
502 | } | |
503 | ||
504 | static inline void complete_dock(struct dock_station *ds) | |
505 | { | |
506 | ds->flags &= ~(DOCK_DOCKING); | |
507 | ds->last_dock_time = jiffies; | |
508 | } | |
509 | ||
a0cd35fd KCA |
510 | static inline void begin_undock(struct dock_station *ds) |
511 | { | |
512 | ds->flags |= DOCK_UNDOCKING; | |
513 | } | |
514 | ||
515 | static inline void complete_undock(struct dock_station *ds) | |
516 | { | |
517 | ds->flags &= ~(DOCK_UNDOCKING); | |
518 | } | |
519 | ||
406f692d SL |
520 | static void dock_lock(struct dock_station *ds, int lock) |
521 | { | |
522 | struct acpi_object_list arg_list; | |
523 | union acpi_object arg; | |
524 | acpi_status status; | |
525 | ||
526 | arg_list.count = 1; | |
527 | arg_list.pointer = &arg; | |
528 | arg.type = ACPI_TYPE_INTEGER; | |
529 | arg.integer.value = !!lock; | |
530 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
531 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
532 | if (lock) | |
533 | printk(KERN_WARNING PREFIX "Locking device failed\n"); | |
534 | else | |
535 | printk(KERN_WARNING PREFIX "Unlocking device failed\n"); | |
536 | } | |
537 | } | |
538 | ||
c8f7a62c LB |
539 | /** |
540 | * dock_in_progress - see if we are in the middle of handling a dock event | |
541 | * @ds: the dock station | |
542 | * | |
543 | * Sometimes while docking, false dock events can be sent to the driver | |
544 | * because good connections aren't made or some other reason. Ignore these | |
545 | * if we are in the middle of doing something. | |
546 | */ | |
547 | static int dock_in_progress(struct dock_station *ds) | |
548 | { | |
549 | if ((ds->flags & DOCK_DOCKING) || | |
550 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
551 | return 1; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | /** | |
556 | * register_dock_notifier - add yourself to the dock notifier list | |
557 | * @nb: the callers notifier block | |
558 | * | |
559 | * If a driver wishes to be notified about dock events, they can | |
560 | * use this function to put a notifier block on the dock notifier list. | |
561 | * this notifier call chain will be called after a dock event, but | |
562 | * before hotplugging any new devices. | |
563 | */ | |
564 | int register_dock_notifier(struct notifier_block *nb) | |
565 | { | |
db350b08 | 566 | if (!dock_station_count) |
2548c06b PB |
567 | return -ENODEV; |
568 | ||
c8f7a62c LB |
569 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
570 | } | |
571 | ||
572 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
573 | ||
574 | /** | |
575 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
576 | * @nb: the callers notifier block | |
577 | */ | |
578 | void unregister_dock_notifier(struct notifier_block *nb) | |
579 | { | |
db350b08 | 580 | if (!dock_station_count) |
2548c06b PB |
581 | return; |
582 | ||
c8f7a62c LB |
583 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
584 | } | |
585 | ||
586 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
587 | ||
588 | /** | |
589 | * register_hotplug_dock_device - register a hotplug function | |
590 | * @handle: the handle of the device | |
591 | * @handler: the acpi_notifier_handler to call after docking | |
592 | * @context: device specific data | |
593 | * | |
594 | * If a driver would like to perform a hotplug operation after a dock | |
595 | * event, they can register an acpi_notifiy_handler to be called by | |
596 | * the dock driver after _DCK is executed. | |
597 | */ | |
598 | int | |
599 | register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler, | |
600 | void *context) | |
601 | { | |
602 | struct dock_dependent_device *dd; | |
db350b08 | 603 | struct dock_station *dock_station; |
c8f7a62c | 604 | |
db350b08 | 605 | if (!dock_station_count) |
c8f7a62c LB |
606 | return -ENODEV; |
607 | ||
608 | /* | |
609 | * make sure this handle is for a device dependent on the dock, | |
610 | * this would include the dock station itself | |
611 | */ | |
db350b08 SL |
612 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
613 | dd = find_dock_dependent_device(dock_station, handle); | |
614 | if (dd) { | |
615 | dd->handler = handler; | |
616 | dd->context = context; | |
617 | dock_add_hotplug_device(dock_station, dd); | |
618 | return 0; | |
619 | } | |
c8f7a62c LB |
620 | } |
621 | ||
622 | return -EINVAL; | |
623 | } | |
624 | ||
625 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
626 | ||
627 | /** | |
628 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
629 | * @handle: the acpi handle of the device | |
630 | */ | |
631 | void unregister_hotplug_dock_device(acpi_handle handle) | |
632 | { | |
633 | struct dock_dependent_device *dd; | |
db350b08 | 634 | struct dock_station *dock_station; |
c8f7a62c | 635 | |
db350b08 | 636 | if (!dock_station_count) |
c8f7a62c LB |
637 | return; |
638 | ||
db350b08 SL |
639 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
640 | dd = find_dock_dependent_device(dock_station, handle); | |
641 | if (dd) | |
642 | dock_del_hotplug_device(dock_station, dd); | |
643 | } | |
c8f7a62c LB |
644 | } |
645 | ||
646 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
647 | ||
c80fdbe8 | 648 | /** |
649 | * handle_eject_request - handle an undock request checking for error conditions | |
650 | * | |
651 | * Check to make sure the dock device is still present, then undock and | |
652 | * hotremove all the devices that may need removing. | |
653 | */ | |
654 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
655 | { | |
c80fdbe8 | 656 | if (dock_in_progress(ds)) |
657 | return -EBUSY; | |
658 | ||
659 | /* | |
660 | * here we need to generate the undock | |
661 | * event prior to actually doing the undock | |
662 | * so that the device struct still exists. | |
afd7301d HM |
663 | * Also, even send the dock event if the |
664 | * device is not present anymore | |
c80fdbe8 | 665 | */ |
666 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 667 | |
c80fdbe8 | 668 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
669 | undock(ds); | |
406f692d | 670 | dock_lock(ds, 0); |
c80fdbe8 | 671 | eject_dock(ds); |
672 | if (dock_present(ds)) { | |
673 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
674 | return -EBUSY; | |
675 | } | |
a0cd35fd | 676 | complete_undock(ds); |
c80fdbe8 | 677 | return 0; |
678 | } | |
679 | ||
c8f7a62c LB |
680 | /** |
681 | * dock_notify - act upon an acpi dock notification | |
682 | * @handle: the dock station handle | |
683 | * @event: the acpi event | |
684 | * @data: our driver data struct | |
685 | * | |
686 | * If we are notified to dock, then check to see if the dock is | |
687 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 688 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
689 | */ |
690 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
691 | { | |
50dd0969 | 692 | struct dock_station *ds = data; |
8b59560a | 693 | struct acpi_device *tmp; |
db350b08 | 694 | int surprise_removal = 0; |
c8f7a62c | 695 | |
db350b08 SL |
696 | /* |
697 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
698 | * is sent and _DCK is present, it is assumed to mean an undock | |
699 | * request. | |
700 | */ | |
701 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
702 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
703 | ||
704 | /* | |
705 | * dock station: BUS_CHECK - docked or surprise removal | |
706 | * DEVICE_CHECK - undocked | |
707 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
708 | * | |
709 | * To simplify event handling, dock dependent device handler always | |
710 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
711 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
712 | */ | |
c8f7a62c LB |
713 | switch (event) { |
714 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 715 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
716 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
717 | &tmp)) { | |
c8f7a62c LB |
718 | begin_dock(ds); |
719 | dock(ds); | |
720 | if (!dock_present(ds)) { | |
721 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
8b59560a | 722 | complete_dock(ds); |
c8f7a62c LB |
723 | break; |
724 | } | |
725 | atomic_notifier_call_chain(&dock_notifier_list, | |
726 | event, NULL); | |
727 | hotplug_dock_devices(ds, event); | |
728 | complete_dock(ds); | |
729 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 730 | dock_lock(ds, 1); |
db350b08 | 731 | break; |
c8f7a62c | 732 | } |
db350b08 SL |
733 | if (dock_present(ds) || dock_in_progress(ds)) |
734 | break; | |
735 | /* This is a surprise removal */ | |
736 | surprise_removal = 1; | |
737 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
738 | /* Fall back */ | |
c8f7a62c | 739 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 740 | begin_undock(ds); |
f730ae18 SL |
741 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
742 | || surprise_removal) | |
a0cd35fd KCA |
743 | handle_eject_request(ds, event); |
744 | else | |
745 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
746 | break; |
747 | default: | |
748 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
749 | } | |
750 | } | |
751 | ||
19cd847a ZR |
752 | struct dock_data { |
753 | acpi_handle handle; | |
754 | unsigned long event; | |
755 | struct dock_station *ds; | |
756 | }; | |
757 | ||
758 | static void acpi_dock_deferred_cb(void *context) | |
759 | { | |
760 | struct dock_data *data = (struct dock_data *)context; | |
761 | ||
762 | dock_notify(data->handle, data->event, data->ds); | |
763 | kfree(data); | |
764 | } | |
765 | ||
6bd00a61 SL |
766 | static int acpi_dock_notifier_call(struct notifier_block *this, |
767 | unsigned long event, void *data) | |
768 | { | |
769 | struct dock_station *dock_station; | |
770 | acpi_handle handle = (acpi_handle)data; | |
771 | ||
772 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
773 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
774 | return 0; | |
775 | list_for_each_entry(dock_station, &dock_stations, sibiling) { | |
776 | if (dock_station->handle == handle) { | |
19cd847a ZR |
777 | struct dock_data *dock_data; |
778 | ||
779 | dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL); | |
780 | if (!dock_data) | |
781 | return 0; | |
782 | dock_data->handle = handle; | |
783 | dock_data->event = event; | |
784 | dock_data->ds = dock_station; | |
785 | acpi_os_hotplug_execute(acpi_dock_deferred_cb, | |
786 | dock_data); | |
6bd00a61 SL |
787 | return 0 ; |
788 | } | |
789 | } | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static struct notifier_block dock_acpi_notifier = { | |
794 | .notifier_call = acpi_dock_notifier_call, | |
795 | }; | |
796 | ||
c8f7a62c LB |
797 | /** |
798 | * find_dock_devices - find devices on the dock station | |
799 | * @handle: the handle of the device we are examining | |
800 | * @lvl: unused | |
801 | * @context: the dock station private data | |
802 | * @rv: unused | |
803 | * | |
804 | * This function is called by acpi_walk_namespace. It will | |
805 | * check to see if an object has an _EJD method. If it does, then it | |
806 | * will see if it is dependent on the dock station. | |
807 | */ | |
808 | static acpi_status | |
809 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
810 | { | |
811 | acpi_status status; | |
fe9a2f77 | 812 | acpi_handle tmp, parent; |
50dd0969 | 813 | struct dock_station *ds = context; |
c8f7a62c LB |
814 | struct dock_dependent_device *dd; |
815 | ||
816 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
817 | if (ACPI_FAILURE(status)) { |
818 | /* try the parent device as well */ | |
819 | status = acpi_get_parent(handle, &parent); | |
820 | if (ACPI_FAILURE(status)) | |
821 | goto fdd_out; | |
822 | /* see if parent is dependent on dock */ | |
823 | status = acpi_bus_get_ejd(parent, &tmp); | |
824 | if (ACPI_FAILURE(status)) | |
825 | goto fdd_out; | |
826 | } | |
c8f7a62c LB |
827 | |
828 | if (tmp == ds->handle) { | |
829 | dd = alloc_dock_dependent_device(handle); | |
830 | if (dd) | |
831 | add_dock_dependent_device(ds, dd); | |
832 | } | |
fe9a2f77 | 833 | fdd_out: |
c8f7a62c LB |
834 | return AE_OK; |
835 | } | |
836 | ||
c80fdbe8 | 837 | /* |
838 | * show_docked - read method for "docked" file in sysfs | |
839 | */ | |
840 | static ssize_t show_docked(struct device *dev, | |
841 | struct device_attribute *attr, char *buf) | |
842 | { | |
db350b08 SL |
843 | struct dock_station *dock_station = *((struct dock_station **) |
844 | dev->platform_data); | |
c80fdbe8 | 845 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station)); |
846 | ||
847 | } | |
e5685b9d | 848 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 849 | |
a0cd35fd KCA |
850 | /* |
851 | * show_flags - read method for flags file in sysfs | |
852 | */ | |
853 | static ssize_t show_flags(struct device *dev, | |
854 | struct device_attribute *attr, char *buf) | |
855 | { | |
db350b08 SL |
856 | struct dock_station *dock_station = *((struct dock_station **) |
857 | dev->platform_data); | |
a0cd35fd KCA |
858 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
859 | ||
860 | } | |
e5685b9d | 861 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 862 | |
c80fdbe8 | 863 | /* |
864 | * write_undock - write method for "undock" file in sysfs | |
865 | */ | |
866 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
867 | const char *buf, size_t count) | |
868 | { | |
869 | int ret; | |
db350b08 SL |
870 | struct dock_station *dock_station = *((struct dock_station **) |
871 | dev->platform_data); | |
c80fdbe8 | 872 | |
873 | if (!count) | |
874 | return -EINVAL; | |
875 | ||
9171f834 | 876 | begin_undock(dock_station); |
c80fdbe8 | 877 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
878 | return ret ? ret: count; | |
879 | } | |
e5685b9d | 880 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 881 | |
ac122bb6 IVE |
882 | /* |
883 | * show_dock_uid - read method for "uid" file in sysfs | |
884 | */ | |
885 | static ssize_t show_dock_uid(struct device *dev, | |
886 | struct device_attribute *attr, char *buf) | |
887 | { | |
888 | unsigned long lbuf; | |
db350b08 SL |
889 | struct dock_station *dock_station = *((struct dock_station **) |
890 | dev->platform_data); | |
38ff4ffc KCA |
891 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
892 | "_UID", NULL, &lbuf); | |
893 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 894 | return 0; |
38ff4ffc | 895 | |
ac122bb6 IVE |
896 | return snprintf(buf, PAGE_SIZE, "%lx\n", lbuf); |
897 | } | |
e5685b9d | 898 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 899 | |
c8f7a62c LB |
900 | /** |
901 | * dock_add - add a new dock station | |
902 | * @handle: the dock station handle | |
903 | * | |
904 | * allocated and initialize a new dock station device. Find all devices | |
905 | * that are on the dock station, and register for dock event notifications. | |
906 | */ | |
907 | static int dock_add(acpi_handle handle) | |
908 | { | |
909 | int ret; | |
c8f7a62c | 910 | struct dock_dependent_device *dd; |
db350b08 SL |
911 | struct dock_station *dock_station; |
912 | struct platform_device *dock_device; | |
c8f7a62c LB |
913 | |
914 | /* allocate & initialize the dock_station private data */ | |
915 | dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); | |
916 | if (!dock_station) | |
917 | return -ENOMEM; | |
918 | dock_station->handle = handle; | |
919 | dock_station->last_dock_time = jiffies - HZ; | |
920 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
921 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
db350b08 | 922 | INIT_LIST_HEAD(&dock_station->sibiling); |
c8f7a62c | 923 | spin_lock_init(&dock_station->dd_lock); |
8b0dc866 | 924 | mutex_init(&dock_station->hp_lock); |
07a18684 | 925 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c | 926 | |
671adbec | 927 | /* initialize platform device stuff */ |
db350b08 SL |
928 | dock_station->dock_device = |
929 | platform_device_register_simple(dock_device_name, | |
930 | dock_station_count, NULL, 0); | |
931 | dock_device = dock_station->dock_device; | |
0f6f2804 | 932 | if (IS_ERR(dock_device)) { |
671adbec | 933 | kfree(dock_station); |
22fe4c21 | 934 | dock_station = NULL; |
0f6f2804 | 935 | return PTR_ERR(dock_device); |
671adbec | 936 | } |
db350b08 SL |
937 | platform_device_add_data(dock_device, &dock_station, |
938 | sizeof(struct dock_station *)); | |
a0cd35fd | 939 | |
9ef2a9a9 KCA |
940 | /* we want the dock device to send uevents */ |
941 | dock_device->dev.uevent_suppress = 0; | |
942 | ||
db350b08 SL |
943 | if (is_dock(handle)) |
944 | dock_station->flags |= DOCK_IS_DOCK; | |
945 | if (is_ata(handle)) | |
946 | dock_station->flags |= DOCK_IS_ATA; | |
947 | if (is_battery(handle)) | |
948 | dock_station->flags |= DOCK_IS_BAT; | |
949 | ||
0f6f2804 | 950 | ret = device_create_file(&dock_device->dev, &dev_attr_docked); |
c80fdbe8 | 951 | if (ret) { |
952 | printk("Error %d adding sysfs file\n", ret); | |
0f6f2804 | 953 | platform_device_unregister(dock_device); |
c80fdbe8 | 954 | kfree(dock_station); |
22fe4c21 | 955 | dock_station = NULL; |
c80fdbe8 | 956 | return ret; |
957 | } | |
0f6f2804 | 958 | ret = device_create_file(&dock_device->dev, &dev_attr_undock); |
c80fdbe8 | 959 | if (ret) { |
960 | printk("Error %d adding sysfs file\n", ret); | |
0f6f2804 KCA |
961 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
962 | platform_device_unregister(dock_device); | |
c80fdbe8 | 963 | kfree(dock_station); |
22fe4c21 | 964 | dock_station = NULL; |
c80fdbe8 | 965 | return ret; |
966 | } | |
0f6f2804 | 967 | ret = device_create_file(&dock_device->dev, &dev_attr_uid); |
ac122bb6 IVE |
968 | if (ret) { |
969 | printk("Error %d adding sysfs file\n", ret); | |
0f6f2804 KCA |
970 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
971 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
972 | platform_device_unregister(dock_device); | |
ac122bb6 | 973 | kfree(dock_station); |
22fe4c21 | 974 | dock_station = NULL; |
ac122bb6 IVE |
975 | return ret; |
976 | } | |
a0cd35fd KCA |
977 | ret = device_create_file(&dock_device->dev, &dev_attr_flags); |
978 | if (ret) { | |
979 | printk("Error %d adding sysfs file\n", ret); | |
980 | device_remove_file(&dock_device->dev, &dev_attr_docked); | |
981 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
982 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
983 | platform_device_unregister(dock_device); | |
984 | kfree(dock_station); | |
985 | dock_station = NULL; | |
986 | return ret; | |
987 | } | |
671adbec | 988 | |
c8f7a62c LB |
989 | /* Find dependent devices */ |
990 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
991 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
992 | NULL); | |
993 | ||
994 | /* add the dock station as a device dependent on itself */ | |
995 | dd = alloc_dock_dependent_device(handle); | |
996 | if (!dd) { | |
997 | kfree(dock_station); | |
22fe4c21 | 998 | dock_station = NULL; |
671adbec KCA |
999 | ret = -ENOMEM; |
1000 | goto dock_add_err_unregister; | |
c8f7a62c LB |
1001 | } |
1002 | add_dock_dependent_device(dock_station, dd); | |
1003 | ||
db350b08 SL |
1004 | dock_station_count++; |
1005 | list_add(&dock_station->sibiling, &dock_stations); | |
c8f7a62c LB |
1006 | return 0; |
1007 | ||
671adbec | 1008 | dock_add_err_unregister: |
0f6f2804 KCA |
1009 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1010 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1011 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1012 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1013 | platform_device_unregister(dock_device); |
671adbec | 1014 | kfree(dock_station); |
22fe4c21 | 1015 | dock_station = NULL; |
c8f7a62c LB |
1016 | return ret; |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * dock_remove - free up resources related to the dock station | |
1021 | */ | |
db350b08 | 1022 | static int dock_remove(struct dock_station *dock_station) |
c8f7a62c LB |
1023 | { |
1024 | struct dock_dependent_device *dd, *tmp; | |
db350b08 | 1025 | struct platform_device *dock_device = dock_station->dock_device; |
c8f7a62c | 1026 | |
db350b08 | 1027 | if (!dock_station_count) |
c8f7a62c LB |
1028 | return 0; |
1029 | ||
1030 | /* remove dependent devices */ | |
1031 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
1032 | list) | |
1033 | kfree(dd); | |
1034 | ||
671adbec | 1035 | /* cleanup sysfs */ |
0f6f2804 KCA |
1036 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1037 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1038 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1039 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1040 | platform_device_unregister(dock_device); |
671adbec | 1041 | |
c8f7a62c LB |
1042 | /* free dock station memory */ |
1043 | kfree(dock_station); | |
22fe4c21 | 1044 | dock_station = NULL; |
c8f7a62c LB |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * find_dock - look for a dock station | |
1050 | * @handle: acpi handle of a device | |
1051 | * @lvl: unused | |
1052 | * @context: counter of dock stations found | |
1053 | * @rv: unused | |
1054 | * | |
1055 | * This is called by acpi_walk_namespace to look for dock stations. | |
1056 | */ | |
1057 | static acpi_status | |
1058 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
1059 | { | |
c8f7a62c LB |
1060 | acpi_status status = AE_OK; |
1061 | ||
1062 | if (is_dock(handle)) { | |
1063 | if (dock_add(handle) >= 0) { | |
c8f7a62c LB |
1064 | status = AE_CTRL_TERMINATE; |
1065 | } | |
1066 | } | |
1067 | return status; | |
1068 | } | |
1069 | ||
db350b08 SL |
1070 | static acpi_status |
1071 | find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) | |
c8f7a62c | 1072 | { |
db350b08 SL |
1073 | /* If bay is in a dock, it's already handled */ |
1074 | if (is_ejectable_bay(handle) && !is_dock_device(handle)) | |
1075 | dock_add(handle); | |
1076 | return AE_OK; | |
1077 | } | |
c8f7a62c | 1078 | |
db350b08 SL |
1079 | static int __init dock_init(void) |
1080 | { | |
816c2eda LB |
1081 | if (acpi_disabled) |
1082 | return 0; | |
1083 | ||
c8f7a62c LB |
1084 | /* look for a dock station */ |
1085 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
db350b08 | 1086 | ACPI_UINT32_MAX, find_dock, NULL, NULL); |
c8f7a62c | 1087 | |
db350b08 SL |
1088 | /* look for bay */ |
1089 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1090 | ACPI_UINT32_MAX, find_bay, NULL, NULL); | |
1091 | if (!dock_station_count) { | |
1092 | printk(KERN_INFO PREFIX "No dock devices found.\n"); | |
1093 | return 0; | |
1094 | } | |
c8f7a62c | 1095 | |
6bd00a61 | 1096 | register_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1097 | printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
1098 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); | |
c8f7a62c LB |
1099 | return 0; |
1100 | } | |
1101 | ||
1102 | static void __exit dock_exit(void) | |
1103 | { | |
db350b08 SL |
1104 | struct dock_station *dock_station; |
1105 | ||
6bd00a61 | 1106 | unregister_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1107 | list_for_each_entry(dock_station, &dock_stations, sibiling) |
1108 | dock_remove(dock_station); | |
c8f7a62c LB |
1109 | } |
1110 | ||
db350b08 SL |
1111 | /* |
1112 | * Must be called before drivers of devices in dock, otherwise we can't know | |
1113 | * which devices are in a dock | |
1114 | */ | |
1115 | subsys_initcall(dock_init); | |
c8f7a62c | 1116 | module_exit(dock_exit); |