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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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c8f7a62c LB |
28 | #include <linux/init.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/notifier.h> | |
671adbec | 31 | #include <linux/platform_device.h> |
914e2637 | 32 | #include <linux/jiffies.h> |
62a6d7fd | 33 | #include <linux/stddef.h> |
c8f7a62c LB |
34 | #include <acpi/acpi_bus.h> |
35 | #include <acpi/acpi_drivers.h> | |
36 | ||
a192a958 LB |
37 | #define PREFIX "ACPI: " |
38 | ||
7cda93e0 | 39 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
c8f7a62c | 40 | |
f52fd66d | 41 | ACPI_MODULE_NAME("dock"); |
c8f7a62c | 42 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
7cda93e0 | 43 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
44 | MODULE_LICENSE("GPL"); |
45 | ||
a0cd35fd KCA |
46 | static int immediate_undock = 1; |
47 | module_param(immediate_undock, bool, 0644); | |
48 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " | |
49 | "undock immediately when the undock button is pressed, 0 will cause" | |
50 | " the driver to wait for userspace to write the undock sysfs file " | |
51 | " before undocking"); | |
52 | ||
c8f7a62c LB |
53 | static struct atomic_notifier_head dock_notifier_list; |
54 | ||
a340af14 FS |
55 | static const struct acpi_device_id dock_device_ids[] = { |
56 | {"LNXDOCK", 0}, | |
57 | {"", 0}, | |
58 | }; | |
59 | MODULE_DEVICE_TABLE(acpi, dock_device_ids); | |
60 | ||
c8f7a62c LB |
61 | struct dock_station { |
62 | acpi_handle handle; | |
63 | unsigned long last_dock_time; | |
64 | u32 flags; | |
65 | spinlock_t dd_lock; | |
8b0dc866 | 66 | struct mutex hp_lock; |
c8f7a62c LB |
67 | struct list_head dependent_devices; |
68 | struct list_head hotplug_devices; | |
db350b08 | 69 | |
50d716e4 | 70 | struct list_head sibling; |
db350b08 | 71 | struct platform_device *dock_device; |
c8f7a62c | 72 | }; |
db350b08 SL |
73 | static LIST_HEAD(dock_stations); |
74 | static int dock_station_count; | |
c8f7a62c LB |
75 | |
76 | struct dock_dependent_device { | |
77 | struct list_head list; | |
78 | struct list_head hotplug_list; | |
79 | acpi_handle handle; | |
9c8b04be | 80 | const struct acpi_dock_ops *ops; |
c8f7a62c LB |
81 | void *context; |
82 | }; | |
83 | ||
84 | #define DOCK_DOCKING 0x00000001 | |
a0cd35fd | 85 | #define DOCK_UNDOCKING 0x00000002 |
db350b08 SL |
86 | #define DOCK_IS_DOCK 0x00000010 |
87 | #define DOCK_IS_ATA 0x00000020 | |
88 | #define DOCK_IS_BAT 0x00000040 | |
5669021e KCA |
89 | #define DOCK_EVENT 3 |
90 | #define UNDOCK_EVENT 2 | |
c8f7a62c | 91 | |
c8f7a62c LB |
92 | /***************************************************************************** |
93 | * Dock Dependent device functions * | |
94 | *****************************************************************************/ | |
95 | /** | |
f69cfdd2 AC |
96 | * add_dock_dependent_device - associate a device with the dock station |
97 | * @ds: The dock station | |
98 | * @handle: handle of the dependent device | |
c8f7a62c | 99 | * |
f69cfdd2 | 100 | * Add the dependent device to the dock's dependent device list. |
c8f7a62c | 101 | */ |
f69cfdd2 AC |
102 | static int |
103 | add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
c8f7a62c LB |
104 | { |
105 | struct dock_dependent_device *dd; | |
106 | ||
107 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
f69cfdd2 AC |
108 | if (!dd) |
109 | return -ENOMEM; | |
110 | ||
111 | dd->handle = handle; | |
112 | INIT_LIST_HEAD(&dd->list); | |
113 | INIT_LIST_HEAD(&dd->hotplug_list); | |
c8f7a62c | 114 | |
c8f7a62c LB |
115 | spin_lock(&ds->dd_lock); |
116 | list_add_tail(&dd->list, &ds->dependent_devices); | |
117 | spin_unlock(&ds->dd_lock); | |
f69cfdd2 AC |
118 | |
119 | return 0; | |
c8f7a62c LB |
120 | } |
121 | ||
122 | /** | |
123 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
124 | * @ds: The dock station | |
125 | * @dd: The dependent device struct | |
126 | * | |
127 | * Add the dependent device to the dock's hotplug device list | |
128 | */ | |
129 | static void | |
130 | dock_add_hotplug_device(struct dock_station *ds, | |
131 | struct dock_dependent_device *dd) | |
132 | { | |
8b0dc866 | 133 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 134 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
8b0dc866 | 135 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
136 | } |
137 | ||
138 | /** | |
139 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
140 | * @ds: The dock station | |
141 | * @dd: the dependent device struct | |
142 | * | |
143 | * Delete the dependent device from the dock's hotplug device list | |
144 | */ | |
145 | static void | |
146 | dock_del_hotplug_device(struct dock_station *ds, | |
147 | struct dock_dependent_device *dd) | |
148 | { | |
8b0dc866 | 149 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 150 | list_del(&dd->hotplug_list); |
8b0dc866 | 151 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
152 | } |
153 | ||
154 | /** | |
155 | * find_dock_dependent_device - get a device dependent on this dock | |
156 | * @ds: the dock station | |
157 | * @handle: the acpi_handle of the device we want | |
158 | * | |
159 | * iterate over the dependent device list for this dock. If the | |
160 | * dependent device matches the handle, return. | |
161 | */ | |
162 | static struct dock_dependent_device * | |
163 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
164 | { | |
165 | struct dock_dependent_device *dd; | |
166 | ||
167 | spin_lock(&ds->dd_lock); | |
168 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
169 | if (handle == dd->handle) { | |
170 | spin_unlock(&ds->dd_lock); | |
171 | return dd; | |
172 | } | |
173 | } | |
174 | spin_unlock(&ds->dd_lock); | |
175 | return NULL; | |
176 | } | |
177 | ||
178 | /***************************************************************************** | |
179 | * Dock functions * | |
180 | *****************************************************************************/ | |
181 | /** | |
182 | * is_dock - see if a device is a dock station | |
183 | * @handle: acpi handle of the device | |
184 | * | |
185 | * If an acpi object has a _DCK method, then it is by definition a dock | |
186 | * station, so return true. | |
187 | */ | |
188 | static int is_dock(acpi_handle handle) | |
189 | { | |
190 | acpi_status status; | |
191 | acpi_handle tmp; | |
192 | ||
193 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
194 | if (ACPI_FAILURE(status)) | |
195 | return 0; | |
196 | return 1; | |
197 | } | |
198 | ||
db350b08 SL |
199 | static int is_ejectable(acpi_handle handle) |
200 | { | |
201 | acpi_status status; | |
202 | acpi_handle tmp; | |
203 | ||
204 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
205 | if (ACPI_FAILURE(status)) | |
206 | return 0; | |
207 | return 1; | |
208 | } | |
209 | ||
210 | static int is_ata(acpi_handle handle) | |
211 | { | |
212 | acpi_handle tmp; | |
213 | ||
214 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || | |
215 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || | |
216 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || | |
217 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) | |
218 | return 1; | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int is_battery(acpi_handle handle) | |
224 | { | |
225 | struct acpi_device_info *info; | |
db350b08 SL |
226 | int ret = 1; |
227 | ||
15b8dd53 | 228 | if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) |
db350b08 | 229 | return 0; |
db350b08 SL |
230 | if (!(info->valid & ACPI_VALID_HID)) |
231 | ret = 0; | |
232 | else | |
15b8dd53 | 233 | ret = !strcmp("PNP0C0A", info->hardware_id.string); |
db350b08 | 234 | |
15b8dd53 | 235 | kfree(info); |
db350b08 SL |
236 | return ret; |
237 | } | |
238 | ||
239 | static int is_ejectable_bay(acpi_handle handle) | |
240 | { | |
241 | acpi_handle phandle; | |
747479a3 | 242 | |
db350b08 SL |
243 | if (!is_ejectable(handle)) |
244 | return 0; | |
245 | if (is_battery(handle) || is_ata(handle)) | |
246 | return 1; | |
247 | if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) | |
248 | return 1; | |
249 | return 0; | |
250 | } | |
251 | ||
c8f7a62c LB |
252 | /** |
253 | * is_dock_device - see if a device is on a dock station | |
254 | * @handle: acpi handle of the device | |
255 | * | |
256 | * If this device is either the dock station itself, | |
257 | * or is a device dependent on the dock station, then it | |
258 | * is a dock device | |
259 | */ | |
260 | int is_dock_device(acpi_handle handle) | |
261 | { | |
db350b08 SL |
262 | struct dock_station *dock_station; |
263 | ||
264 | if (!dock_station_count) | |
c8f7a62c LB |
265 | return 0; |
266 | ||
db350b08 | 267 | if (is_dock(handle)) |
c8f7a62c | 268 | return 1; |
747479a3 AC |
269 | |
270 | list_for_each_entry(dock_station, &dock_stations, sibling) | |
db350b08 SL |
271 | if (find_dock_dependent_device(dock_station, handle)) |
272 | return 1; | |
c8f7a62c LB |
273 | |
274 | return 0; | |
275 | } | |
c8f7a62c LB |
276 | EXPORT_SYMBOL_GPL(is_dock_device); |
277 | ||
278 | /** | |
279 | * dock_present - see if the dock station is present. | |
280 | * @ds: the dock station | |
281 | * | |
282 | * execute the _STA method. note that present does not | |
283 | * imply that we are docked. | |
284 | */ | |
285 | static int dock_present(struct dock_station *ds) | |
286 | { | |
27663c58 | 287 | unsigned long long sta; |
c8f7a62c LB |
288 | acpi_status status; |
289 | ||
290 | if (ds) { | |
291 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
292 | if (ACPI_SUCCESS(status) && sta) | |
293 | return 1; | |
294 | } | |
295 | return 0; | |
296 | } | |
297 | ||
c8f7a62c LB |
298 | /** |
299 | * dock_create_acpi_device - add new devices to acpi | |
300 | * @handle - handle of the device to add | |
301 | * | |
302 | * This function will create a new acpi_device for the given | |
303 | * handle if one does not exist already. This should cause | |
304 | * acpi to scan for drivers for the given devices, and call | |
305 | * matching driver's add routine. | |
306 | * | |
307 | * Returns a pointer to the acpi_device corresponding to the handle. | |
308 | */ | |
309 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
310 | { | |
747479a3 | 311 | struct acpi_device *device; |
c8f7a62c LB |
312 | struct acpi_device *parent_device; |
313 | acpi_handle parent; | |
314 | int ret; | |
315 | ||
316 | if (acpi_bus_get_device(handle, &device)) { | |
317 | /* | |
318 | * no device created for this object, | |
319 | * so we should create one. | |
320 | */ | |
321 | acpi_get_parent(handle, &parent); | |
322 | if (acpi_bus_get_device(parent, &parent_device)) | |
323 | parent_device = NULL; | |
324 | ||
325 | ret = acpi_bus_add(&device, parent_device, handle, | |
326 | ACPI_BUS_TYPE_DEVICE); | |
327 | if (ret) { | |
747479a3 | 328 | pr_debug("error adding bus, %x\n", -ret); |
c8f7a62c LB |
329 | return NULL; |
330 | } | |
331 | } | |
332 | return device; | |
333 | } | |
334 | ||
335 | /** | |
336 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
337 | * @handle - the handle of the device to remove | |
338 | * | |
339 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
340 | * driver to have it's remove routine called. | |
341 | */ | |
342 | static void dock_remove_acpi_device(acpi_handle handle) | |
343 | { | |
344 | struct acpi_device *device; | |
345 | int ret; | |
346 | ||
347 | if (!acpi_bus_get_device(handle, &device)) { | |
348 | ret = acpi_bus_trim(device, 1); | |
349 | if (ret) | |
350 | pr_debug("error removing bus, %x\n", -ret); | |
351 | } | |
352 | } | |
353 | ||
c8f7a62c LB |
354 | /** |
355 | * hotplug_dock_devices - insert or remove devices on the dock station | |
356 | * @ds: the dock station | |
357 | * @event: either bus check or eject request | |
358 | * | |
359 | * Some devices on the dock station need to have drivers called | |
360 | * to perform hotplug operations after a dock event has occurred. | |
361 | * Traverse the list of dock devices that have registered a | |
362 | * hotplug handler, and call the handler. | |
363 | */ | |
364 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
365 | { | |
366 | struct dock_dependent_device *dd; | |
367 | ||
8b0dc866 | 368 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
369 | |
370 | /* | |
371 | * First call driver specific hotplug functions | |
372 | */ | |
747479a3 | 373 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) |
1253f7aa SL |
374 | if (dd->ops && dd->ops->handler) |
375 | dd->ops->handler(dd->handle, event, dd->context); | |
c8f7a62c LB |
376 | |
377 | /* | |
378 | * Now make sure that an acpi_device is created for each | |
379 | * dependent device, or removed if this is an eject request. | |
380 | * This will cause acpi_drivers to be stopped/started if they | |
381 | * exist | |
382 | */ | |
383 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
384 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
385 | dock_remove_acpi_device(dd->handle); | |
386 | else | |
387 | dock_create_acpi_device(dd->handle); | |
388 | } | |
8b0dc866 | 389 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
390 | } |
391 | ||
392 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
393 | { | |
db350b08 | 394 | struct device *dev = &ds->dock_device->dev; |
66b56821 | 395 | char event_string[13]; |
79a8f70b | 396 | char *envp[] = { event_string, NULL }; |
1253f7aa | 397 | struct dock_dependent_device *dd; |
79a8f70b KCA |
398 | |
399 | if (num == UNDOCK_EVENT) | |
66b56821 | 400 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 401 | else |
66b56821 | 402 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 403 | |
5669021e | 404 | /* |
8ea86e0b KCA |
405 | * Indicate that the status of the dock station has |
406 | * changed. | |
5669021e | 407 | */ |
1253f7aa SL |
408 | if (num == DOCK_EVENT) |
409 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
410 | ||
411 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) | |
412 | if (dd->ops && dd->ops->uevent) | |
413 | dd->ops->uevent(dd->handle, event, dd->context); | |
747479a3 | 414 | |
1253f7aa SL |
415 | if (num != DOCK_EVENT) |
416 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
c8f7a62c LB |
417 | } |
418 | ||
419 | /** | |
420 | * eject_dock - respond to a dock eject request | |
421 | * @ds: the dock station | |
422 | * | |
423 | * This is called after _DCK is called, to execute the dock station's | |
424 | * _EJ0 method. | |
425 | */ | |
426 | static void eject_dock(struct dock_station *ds) | |
427 | { | |
428 | struct acpi_object_list arg_list; | |
429 | union acpi_object arg; | |
430 | acpi_status status; | |
431 | acpi_handle tmp; | |
432 | ||
433 | /* all dock devices should have _EJ0, but check anyway */ | |
434 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
435 | if (ACPI_FAILURE(status)) { | |
436 | pr_debug("No _EJ0 support for dock device\n"); | |
437 | return; | |
438 | } | |
439 | ||
440 | arg_list.count = 1; | |
441 | arg_list.pointer = &arg; | |
442 | arg.type = ACPI_TYPE_INTEGER; | |
443 | arg.integer.value = 1; | |
444 | ||
747479a3 AC |
445 | status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); |
446 | if (ACPI_FAILURE(status)) | |
c8f7a62c LB |
447 | pr_debug("Failed to evaluate _EJ0!\n"); |
448 | } | |
449 | ||
450 | /** | |
451 | * handle_dock - handle a dock event | |
452 | * @ds: the dock station | |
453 | * @dock: to dock, or undock - that is the question | |
454 | * | |
455 | * Execute the _DCK method in response to an acpi event | |
456 | */ | |
457 | static void handle_dock(struct dock_station *ds, int dock) | |
458 | { | |
459 | acpi_status status; | |
460 | struct acpi_object_list arg_list; | |
461 | union acpi_object arg; | |
462 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
463 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c LB |
464 | |
465 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
c8f7a62c | 466 | |
9254bc84 DT |
467 | printk(KERN_INFO PREFIX "%s - %s\n", |
468 | (char *)name_buffer.pointer, dock ? "docking" : "undocking"); | |
c8f7a62c LB |
469 | |
470 | /* _DCK method has one argument */ | |
471 | arg_list.count = 1; | |
472 | arg_list.pointer = &arg; | |
473 | arg.type = ACPI_TYPE_INTEGER; | |
474 | arg.integer.value = dock; | |
475 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 476 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
0a918a94 TR |
477 | ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" |
478 | " _DCK\n", (char *)name_buffer.pointer)); | |
479 | ||
c8f7a62c LB |
480 | kfree(buffer.pointer); |
481 | kfree(name_buffer.pointer); | |
482 | } | |
483 | ||
484 | static inline void dock(struct dock_station *ds) | |
485 | { | |
486 | handle_dock(ds, 1); | |
487 | } | |
488 | ||
489 | static inline void undock(struct dock_station *ds) | |
490 | { | |
491 | handle_dock(ds, 0); | |
492 | } | |
493 | ||
494 | static inline void begin_dock(struct dock_station *ds) | |
495 | { | |
496 | ds->flags |= DOCK_DOCKING; | |
497 | } | |
498 | ||
499 | static inline void complete_dock(struct dock_station *ds) | |
500 | { | |
501 | ds->flags &= ~(DOCK_DOCKING); | |
502 | ds->last_dock_time = jiffies; | |
503 | } | |
504 | ||
a0cd35fd KCA |
505 | static inline void begin_undock(struct dock_station *ds) |
506 | { | |
507 | ds->flags |= DOCK_UNDOCKING; | |
508 | } | |
509 | ||
510 | static inline void complete_undock(struct dock_station *ds) | |
511 | { | |
512 | ds->flags &= ~(DOCK_UNDOCKING); | |
513 | } | |
514 | ||
406f692d SL |
515 | static void dock_lock(struct dock_station *ds, int lock) |
516 | { | |
517 | struct acpi_object_list arg_list; | |
518 | union acpi_object arg; | |
519 | acpi_status status; | |
520 | ||
521 | arg_list.count = 1; | |
522 | arg_list.pointer = &arg; | |
523 | arg.type = ACPI_TYPE_INTEGER; | |
524 | arg.integer.value = !!lock; | |
525 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
526 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
527 | if (lock) | |
528 | printk(KERN_WARNING PREFIX "Locking device failed\n"); | |
529 | else | |
530 | printk(KERN_WARNING PREFIX "Unlocking device failed\n"); | |
531 | } | |
532 | } | |
533 | ||
c8f7a62c LB |
534 | /** |
535 | * dock_in_progress - see if we are in the middle of handling a dock event | |
536 | * @ds: the dock station | |
537 | * | |
538 | * Sometimes while docking, false dock events can be sent to the driver | |
539 | * because good connections aren't made or some other reason. Ignore these | |
540 | * if we are in the middle of doing something. | |
541 | */ | |
542 | static int dock_in_progress(struct dock_station *ds) | |
543 | { | |
544 | if ((ds->flags & DOCK_DOCKING) || | |
545 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
546 | return 1; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /** | |
551 | * register_dock_notifier - add yourself to the dock notifier list | |
552 | * @nb: the callers notifier block | |
553 | * | |
554 | * If a driver wishes to be notified about dock events, they can | |
555 | * use this function to put a notifier block on the dock notifier list. | |
556 | * this notifier call chain will be called after a dock event, but | |
557 | * before hotplugging any new devices. | |
558 | */ | |
559 | int register_dock_notifier(struct notifier_block *nb) | |
560 | { | |
db350b08 | 561 | if (!dock_station_count) |
2548c06b PB |
562 | return -ENODEV; |
563 | ||
c8f7a62c LB |
564 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
565 | } | |
c8f7a62c LB |
566 | EXPORT_SYMBOL_GPL(register_dock_notifier); |
567 | ||
568 | /** | |
569 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
570 | * @nb: the callers notifier block | |
571 | */ | |
572 | void unregister_dock_notifier(struct notifier_block *nb) | |
573 | { | |
db350b08 | 574 | if (!dock_station_count) |
2548c06b PB |
575 | return; |
576 | ||
c8f7a62c LB |
577 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
578 | } | |
c8f7a62c LB |
579 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); |
580 | ||
581 | /** | |
582 | * register_hotplug_dock_device - register a hotplug function | |
583 | * @handle: the handle of the device | |
1253f7aa | 584 | * @ops: handlers to call after docking |
c8f7a62c LB |
585 | * @context: device specific data |
586 | * | |
587 | * If a driver would like to perform a hotplug operation after a dock | |
588 | * event, they can register an acpi_notifiy_handler to be called by | |
589 | * the dock driver after _DCK is executed. | |
590 | */ | |
591 | int | |
9c8b04be | 592 | register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops, |
c8f7a62c LB |
593 | void *context) |
594 | { | |
595 | struct dock_dependent_device *dd; | |
db350b08 | 596 | struct dock_station *dock_station; |
61b83695 | 597 | int ret = -EINVAL; |
c8f7a62c | 598 | |
db350b08 | 599 | if (!dock_station_count) |
c8f7a62c LB |
600 | return -ENODEV; |
601 | ||
602 | /* | |
603 | * make sure this handle is for a device dependent on the dock, | |
604 | * this would include the dock station itself | |
605 | */ | |
50d716e4 | 606 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
61b83695 SL |
607 | /* |
608 | * An ATA bay can be in a dock and itself can be ejected | |
3ad2f3fb | 609 | * separately, so there are two 'dock stations' which need the |
61b83695 SL |
610 | * ops |
611 | */ | |
db350b08 SL |
612 | dd = find_dock_dependent_device(dock_station, handle); |
613 | if (dd) { | |
1253f7aa | 614 | dd->ops = ops; |
db350b08 SL |
615 | dd->context = context; |
616 | dock_add_hotplug_device(dock_station, dd); | |
61b83695 | 617 | ret = 0; |
db350b08 | 618 | } |
c8f7a62c LB |
619 | } |
620 | ||
61b83695 | 621 | return ret; |
c8f7a62c | 622 | } |
c8f7a62c LB |
623 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); |
624 | ||
625 | /** | |
626 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
627 | * @handle: the acpi handle of the device | |
628 | */ | |
629 | void unregister_hotplug_dock_device(acpi_handle handle) | |
630 | { | |
631 | struct dock_dependent_device *dd; | |
db350b08 | 632 | struct dock_station *dock_station; |
c8f7a62c | 633 | |
db350b08 | 634 | if (!dock_station_count) |
c8f7a62c LB |
635 | return; |
636 | ||
50d716e4 | 637 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
db350b08 SL |
638 | dd = find_dock_dependent_device(dock_station, handle); |
639 | if (dd) | |
640 | dock_del_hotplug_device(dock_station, dd); | |
641 | } | |
c8f7a62c | 642 | } |
c8f7a62c LB |
643 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); |
644 | ||
c80fdbe8 | 645 | /** |
646 | * handle_eject_request - handle an undock request checking for error conditions | |
647 | * | |
648 | * Check to make sure the dock device is still present, then undock and | |
649 | * hotremove all the devices that may need removing. | |
650 | */ | |
651 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
652 | { | |
c80fdbe8 | 653 | if (dock_in_progress(ds)) |
654 | return -EBUSY; | |
655 | ||
656 | /* | |
657 | * here we need to generate the undock | |
658 | * event prior to actually doing the undock | |
659 | * so that the device struct still exists. | |
afd7301d HM |
660 | * Also, even send the dock event if the |
661 | * device is not present anymore | |
c80fdbe8 | 662 | */ |
663 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 664 | |
c80fdbe8 | 665 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
666 | undock(ds); | |
406f692d | 667 | dock_lock(ds, 0); |
c80fdbe8 | 668 | eject_dock(ds); |
669 | if (dock_present(ds)) { | |
670 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
671 | return -EBUSY; | |
672 | } | |
a0cd35fd | 673 | complete_undock(ds); |
c80fdbe8 | 674 | return 0; |
675 | } | |
676 | ||
c8f7a62c LB |
677 | /** |
678 | * dock_notify - act upon an acpi dock notification | |
679 | * @handle: the dock station handle | |
680 | * @event: the acpi event | |
681 | * @data: our driver data struct | |
682 | * | |
683 | * If we are notified to dock, then check to see if the dock is | |
684 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 685 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
686 | */ |
687 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
688 | { | |
50dd0969 | 689 | struct dock_station *ds = data; |
8b59560a | 690 | struct acpi_device *tmp; |
db350b08 | 691 | int surprise_removal = 0; |
c8f7a62c | 692 | |
db350b08 SL |
693 | /* |
694 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
695 | * is sent and _DCK is present, it is assumed to mean an undock | |
696 | * request. | |
697 | */ | |
698 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
699 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
700 | ||
701 | /* | |
702 | * dock station: BUS_CHECK - docked or surprise removal | |
703 | * DEVICE_CHECK - undocked | |
704 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
705 | * | |
706 | * To simplify event handling, dock dependent device handler always | |
707 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
708 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
709 | */ | |
c8f7a62c LB |
710 | switch (event) { |
711 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 712 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
713 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
714 | &tmp)) { | |
c8f7a62c LB |
715 | begin_dock(ds); |
716 | dock(ds); | |
717 | if (!dock_present(ds)) { | |
718 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
8b59560a | 719 | complete_dock(ds); |
c8f7a62c LB |
720 | break; |
721 | } | |
722 | atomic_notifier_call_chain(&dock_notifier_list, | |
723 | event, NULL); | |
724 | hotplug_dock_devices(ds, event); | |
725 | complete_dock(ds); | |
726 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 727 | dock_lock(ds, 1); |
3a37898d | 728 | acpi_update_all_gpes(); |
db350b08 | 729 | break; |
c8f7a62c | 730 | } |
db350b08 SL |
731 | if (dock_present(ds) || dock_in_progress(ds)) |
732 | break; | |
733 | /* This is a surprise removal */ | |
734 | surprise_removal = 1; | |
735 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
736 | /* Fall back */ | |
c8f7a62c | 737 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 738 | begin_undock(ds); |
f730ae18 SL |
739 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
740 | || surprise_removal) | |
a0cd35fd KCA |
741 | handle_eject_request(ds, event); |
742 | else | |
743 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
744 | break; |
745 | default: | |
746 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
747 | } | |
748 | } | |
749 | ||
19cd847a ZR |
750 | struct dock_data { |
751 | acpi_handle handle; | |
752 | unsigned long event; | |
753 | struct dock_station *ds; | |
754 | }; | |
755 | ||
756 | static void acpi_dock_deferred_cb(void *context) | |
757 | { | |
747479a3 | 758 | struct dock_data *data = context; |
19cd847a ZR |
759 | |
760 | dock_notify(data->handle, data->event, data->ds); | |
761 | kfree(data); | |
762 | } | |
763 | ||
6bd00a61 SL |
764 | static int acpi_dock_notifier_call(struct notifier_block *this, |
765 | unsigned long event, void *data) | |
766 | { | |
767 | struct dock_station *dock_station; | |
747479a3 | 768 | acpi_handle handle = data; |
6bd00a61 SL |
769 | |
770 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
771 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
772 | return 0; | |
50d716e4 | 773 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
6bd00a61 | 774 | if (dock_station->handle == handle) { |
747479a3 | 775 | struct dock_data *dd; |
19cd847a | 776 | |
747479a3 AC |
777 | dd = kmalloc(sizeof(*dd), GFP_KERNEL); |
778 | if (!dd) | |
19cd847a | 779 | return 0; |
747479a3 AC |
780 | dd->handle = handle; |
781 | dd->event = event; | |
782 | dd->ds = dock_station; | |
783 | acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd); | |
6bd00a61 SL |
784 | return 0 ; |
785 | } | |
786 | } | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static struct notifier_block dock_acpi_notifier = { | |
791 | .notifier_call = acpi_dock_notifier_call, | |
792 | }; | |
793 | ||
c8f7a62c LB |
794 | /** |
795 | * find_dock_devices - find devices on the dock station | |
796 | * @handle: the handle of the device we are examining | |
797 | * @lvl: unused | |
798 | * @context: the dock station private data | |
799 | * @rv: unused | |
800 | * | |
801 | * This function is called by acpi_walk_namespace. It will | |
802 | * check to see if an object has an _EJD method. If it does, then it | |
803 | * will see if it is dependent on the dock station. | |
804 | */ | |
805 | static acpi_status | |
806 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
807 | { | |
808 | acpi_status status; | |
fe9a2f77 | 809 | acpi_handle tmp, parent; |
50dd0969 | 810 | struct dock_station *ds = context; |
c8f7a62c LB |
811 | |
812 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
813 | if (ACPI_FAILURE(status)) { |
814 | /* try the parent device as well */ | |
815 | status = acpi_get_parent(handle, &parent); | |
816 | if (ACPI_FAILURE(status)) | |
817 | goto fdd_out; | |
818 | /* see if parent is dependent on dock */ | |
819 | status = acpi_bus_get_ejd(parent, &tmp); | |
820 | if (ACPI_FAILURE(status)) | |
821 | goto fdd_out; | |
822 | } | |
c8f7a62c | 823 | |
f69cfdd2 AC |
824 | if (tmp == ds->handle) |
825 | add_dock_dependent_device(ds, handle); | |
826 | ||
fe9a2f77 | 827 | fdd_out: |
c8f7a62c LB |
828 | return AE_OK; |
829 | } | |
830 | ||
c80fdbe8 | 831 | /* |
832 | * show_docked - read method for "docked" file in sysfs | |
833 | */ | |
834 | static ssize_t show_docked(struct device *dev, | |
835 | struct device_attribute *attr, char *buf) | |
836 | { | |
fc5a9f88 HM |
837 | struct acpi_device *tmp; |
838 | ||
fe06fba2 | 839 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 840 | |
fc5a9f88 HM |
841 | if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) |
842 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
843 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
c80fdbe8 | 844 | } |
e5685b9d | 845 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 846 | |
a0cd35fd KCA |
847 | /* |
848 | * show_flags - read method for flags file in sysfs | |
849 | */ | |
850 | static ssize_t show_flags(struct device *dev, | |
851 | struct device_attribute *attr, char *buf) | |
852 | { | |
fe06fba2 | 853 | struct dock_station *dock_station = dev->platform_data; |
a0cd35fd KCA |
854 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
855 | ||
856 | } | |
e5685b9d | 857 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 858 | |
c80fdbe8 | 859 | /* |
860 | * write_undock - write method for "undock" file in sysfs | |
861 | */ | |
862 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
863 | const char *buf, size_t count) | |
864 | { | |
865 | int ret; | |
fe06fba2 | 866 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 867 | |
868 | if (!count) | |
869 | return -EINVAL; | |
870 | ||
9171f834 | 871 | begin_undock(dock_station); |
c80fdbe8 | 872 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
873 | return ret ? ret: count; | |
874 | } | |
e5685b9d | 875 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 876 | |
ac122bb6 IVE |
877 | /* |
878 | * show_dock_uid - read method for "uid" file in sysfs | |
879 | */ | |
880 | static ssize_t show_dock_uid(struct device *dev, | |
881 | struct device_attribute *attr, char *buf) | |
882 | { | |
27663c58 | 883 | unsigned long long lbuf; |
fe06fba2 | 884 | struct dock_station *dock_station = dev->platform_data; |
38ff4ffc KCA |
885 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
886 | "_UID", NULL, &lbuf); | |
887 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 888 | return 0; |
38ff4ffc | 889 | |
27663c58 | 890 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
ac122bb6 | 891 | } |
e5685b9d | 892 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 893 | |
8652b00f SL |
894 | static ssize_t show_dock_type(struct device *dev, |
895 | struct device_attribute *attr, char *buf) | |
896 | { | |
fe06fba2 | 897 | struct dock_station *dock_station = dev->platform_data; |
8652b00f SL |
898 | char *type; |
899 | ||
900 | if (dock_station->flags & DOCK_IS_DOCK) | |
901 | type = "dock_station"; | |
902 | else if (dock_station->flags & DOCK_IS_ATA) | |
903 | type = "ata_bay"; | |
904 | else if (dock_station->flags & DOCK_IS_BAT) | |
905 | type = "battery_bay"; | |
906 | else | |
907 | type = "unknown"; | |
908 | ||
909 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
910 | } | |
911 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); | |
912 | ||
5f46c2f2 AC |
913 | static struct attribute *dock_attributes[] = { |
914 | &dev_attr_docked.attr, | |
915 | &dev_attr_flags.attr, | |
916 | &dev_attr_undock.attr, | |
917 | &dev_attr_uid.attr, | |
918 | &dev_attr_type.attr, | |
919 | NULL | |
920 | }; | |
921 | ||
922 | static struct attribute_group dock_attribute_group = { | |
923 | .attrs = dock_attributes | |
924 | }; | |
925 | ||
c8f7a62c LB |
926 | /** |
927 | * dock_add - add a new dock station | |
928 | * @handle: the dock station handle | |
929 | * | |
930 | * allocated and initialize a new dock station device. Find all devices | |
931 | * that are on the dock station, and register for dock event notifications. | |
932 | */ | |
d38a5edf | 933 | static int __init dock_add(acpi_handle handle) |
c8f7a62c | 934 | { |
fe06fba2 AC |
935 | int ret, id; |
936 | struct dock_station ds, *dock_station; | |
747479a3 | 937 | struct platform_device *dd; |
c8f7a62c | 938 | |
fe06fba2 | 939 | id = dock_station_count; |
49c6fb2e | 940 | memset(&ds, 0, sizeof(ds)); |
747479a3 AC |
941 | dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); |
942 | if (IS_ERR(dd)) | |
943 | return PTR_ERR(dd); | |
944 | ||
945 | dock_station = dd->dev.platform_data; | |
c8f7a62c | 946 | |
c8f7a62c | 947 | dock_station->handle = handle; |
747479a3 | 948 | dock_station->dock_device = dd; |
c8f7a62c | 949 | dock_station->last_dock_time = jiffies - HZ; |
747479a3 | 950 | |
8b0dc866 | 951 | mutex_init(&dock_station->hp_lock); |
747479a3 AC |
952 | spin_lock_init(&dock_station->dd_lock); |
953 | INIT_LIST_HEAD(&dock_station->sibling); | |
954 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
07a18684 | 955 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
747479a3 | 956 | INIT_LIST_HEAD(&dock_station->dependent_devices); |
a0cd35fd | 957 | |
9ef2a9a9 | 958 | /* we want the dock device to send uevents */ |
747479a3 | 959 | dev_set_uevent_suppress(&dd->dev, 0); |
9ef2a9a9 | 960 | |
db350b08 SL |
961 | if (is_dock(handle)) |
962 | dock_station->flags |= DOCK_IS_DOCK; | |
963 | if (is_ata(handle)) | |
964 | dock_station->flags |= DOCK_IS_ATA; | |
965 | if (is_battery(handle)) | |
966 | dock_station->flags |= DOCK_IS_BAT; | |
967 | ||
747479a3 | 968 | ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); |
8652b00f | 969 | if (ret) |
5f46c2f2 | 970 | goto err_unregister; |
671adbec | 971 | |
c8f7a62c LB |
972 | /* Find dependent devices */ |
973 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
2263576c LM |
974 | ACPI_UINT32_MAX, find_dock_devices, NULL, |
975 | dock_station, NULL); | |
c8f7a62c LB |
976 | |
977 | /* add the dock station as a device dependent on itself */ | |
f69cfdd2 AC |
978 | ret = add_dock_dependent_device(dock_station, handle); |
979 | if (ret) | |
5f46c2f2 | 980 | goto err_rmgroup; |
c8f7a62c | 981 | |
db350b08 | 982 | dock_station_count++; |
50d716e4 | 983 | list_add(&dock_station->sibling, &dock_stations); |
c8f7a62c LB |
984 | return 0; |
985 | ||
5f46c2f2 | 986 | err_rmgroup: |
747479a3 | 987 | sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); |
5f46c2f2 | 988 | err_unregister: |
747479a3 | 989 | platform_device_unregister(dd); |
5f46c2f2 | 990 | printk(KERN_ERR "%s encountered error %d\n", __func__, ret); |
c8f7a62c LB |
991 | return ret; |
992 | } | |
993 | ||
994 | /** | |
995 | * dock_remove - free up resources related to the dock station | |
996 | */ | |
747479a3 | 997 | static int dock_remove(struct dock_station *ds) |
c8f7a62c LB |
998 | { |
999 | struct dock_dependent_device *dd, *tmp; | |
747479a3 | 1000 | struct platform_device *dock_device = ds->dock_device; |
c8f7a62c | 1001 | |
db350b08 | 1002 | if (!dock_station_count) |
c8f7a62c LB |
1003 | return 0; |
1004 | ||
1005 | /* remove dependent devices */ | |
747479a3 AC |
1006 | list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list) |
1007 | kfree(dd); | |
c8f7a62c | 1008 | |
747479a3 | 1009 | list_del(&ds->sibling); |
c8f7a62c | 1010 | |
671adbec | 1011 | /* cleanup sysfs */ |
5f46c2f2 | 1012 | sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group); |
0f6f2804 | 1013 | platform_device_unregister(dock_device); |
671adbec | 1014 | |
c8f7a62c LB |
1015 | return 0; |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * find_dock - look for a dock station | |
1020 | * @handle: acpi handle of a device | |
1021 | * @lvl: unused | |
1022 | * @context: counter of dock stations found | |
1023 | * @rv: unused | |
1024 | * | |
1025 | * This is called by acpi_walk_namespace to look for dock stations. | |
1026 | */ | |
d38a5edf | 1027 | static __init acpi_status |
c8f7a62c LB |
1028 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) |
1029 | { | |
747479a3 | 1030 | if (is_dock(handle)) |
1ee4d61f | 1031 | dock_add(handle); |
747479a3 | 1032 | |
1ee4d61f | 1033 | return AE_OK; |
c8f7a62c LB |
1034 | } |
1035 | ||
d38a5edf | 1036 | static __init acpi_status |
db350b08 | 1037 | find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) |
c8f7a62c | 1038 | { |
61b83695 SL |
1039 | /* If bay is a dock, it's already handled */ |
1040 | if (is_ejectable_bay(handle) && !is_dock(handle)) | |
db350b08 SL |
1041 | dock_add(handle); |
1042 | return AE_OK; | |
1043 | } | |
c8f7a62c | 1044 | |
db350b08 SL |
1045 | static int __init dock_init(void) |
1046 | { | |
816c2eda LB |
1047 | if (acpi_disabled) |
1048 | return 0; | |
1049 | ||
c8f7a62c LB |
1050 | /* look for a dock station */ |
1051 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
2263576c | 1052 | ACPI_UINT32_MAX, find_dock, NULL, NULL, NULL); |
c8f7a62c | 1053 | |
db350b08 SL |
1054 | /* look for bay */ |
1055 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
2263576c | 1056 | ACPI_UINT32_MAX, find_bay, NULL, NULL, NULL); |
db350b08 SL |
1057 | if (!dock_station_count) { |
1058 | printk(KERN_INFO PREFIX "No dock devices found.\n"); | |
1059 | return 0; | |
1060 | } | |
c8f7a62c | 1061 | |
6bd00a61 | 1062 | register_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1063 | printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
1064 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); | |
c8f7a62c LB |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | static void __exit dock_exit(void) | |
1069 | { | |
747479a3 | 1070 | struct dock_station *tmp, *dock_station; |
db350b08 | 1071 | |
6bd00a61 | 1072 | unregister_acpi_bus_notifier(&dock_acpi_notifier); |
50d716e4 | 1073 | list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling) |
db350b08 | 1074 | dock_remove(dock_station); |
c8f7a62c LB |
1075 | } |
1076 | ||
db350b08 SL |
1077 | /* |
1078 | * Must be called before drivers of devices in dock, otherwise we can't know | |
1079 | * which devices are in a dock | |
1080 | */ | |
1081 | subsys_initcall(dock_init); | |
c8f7a62c | 1082 | module_exit(dock_exit); |