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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; | |
1253f7aa | 78 | struct acpi_dock_ops *ops; |
c8f7a62c LB |
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 | { | |
27663c58 | 297 | unsigned long long sta; |
c8f7a62c LB |
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) { | |
1253f7aa SL |
388 | if (dd->ops && dd->ops->handler) |
389 | dd->ops->handler(dd->handle, event, dd->context); | |
c8f7a62c LB |
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 | 411 | char *envp[] = { event_string, NULL }; |
1253f7aa | 412 | struct dock_dependent_device *dd; |
79a8f70b KCA |
413 | |
414 | if (num == UNDOCK_EVENT) | |
66b56821 | 415 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 416 | else |
66b56821 | 417 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 418 | |
5669021e | 419 | /* |
8ea86e0b KCA |
420 | * Indicate that the status of the dock station has |
421 | * changed. | |
5669021e | 422 | */ |
1253f7aa SL |
423 | if (num == DOCK_EVENT) |
424 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
425 | ||
426 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) | |
427 | if (dd->ops && dd->ops->uevent) | |
428 | dd->ops->uevent(dd->handle, event, dd->context); | |
429 | if (num != DOCK_EVENT) | |
430 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
c8f7a62c LB |
431 | } |
432 | ||
433 | /** | |
434 | * eject_dock - respond to a dock eject request | |
435 | * @ds: the dock station | |
436 | * | |
437 | * This is called after _DCK is called, to execute the dock station's | |
438 | * _EJ0 method. | |
439 | */ | |
440 | static void eject_dock(struct dock_station *ds) | |
441 | { | |
442 | struct acpi_object_list arg_list; | |
443 | union acpi_object arg; | |
444 | acpi_status status; | |
445 | acpi_handle tmp; | |
446 | ||
447 | /* all dock devices should have _EJ0, but check anyway */ | |
448 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
449 | if (ACPI_FAILURE(status)) { | |
450 | pr_debug("No _EJ0 support for dock device\n"); | |
451 | return; | |
452 | } | |
453 | ||
454 | arg_list.count = 1; | |
455 | arg_list.pointer = &arg; | |
456 | arg.type = ACPI_TYPE_INTEGER; | |
457 | arg.integer.value = 1; | |
458 | ||
459 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
460 | &arg_list, NULL))) | |
461 | pr_debug("Failed to evaluate _EJ0!\n"); | |
462 | } | |
463 | ||
464 | /** | |
465 | * handle_dock - handle a dock event | |
466 | * @ds: the dock station | |
467 | * @dock: to dock, or undock - that is the question | |
468 | * | |
469 | * Execute the _DCK method in response to an acpi event | |
470 | */ | |
471 | static void handle_dock(struct dock_station *ds, int dock) | |
472 | { | |
473 | acpi_status status; | |
474 | struct acpi_object_list arg_list; | |
475 | union acpi_object arg; | |
476 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
477 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c LB |
478 | |
479 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
c8f7a62c | 480 | |
9254bc84 DT |
481 | printk(KERN_INFO PREFIX "%s - %s\n", |
482 | (char *)name_buffer.pointer, dock ? "docking" : "undocking"); | |
c8f7a62c LB |
483 | |
484 | /* _DCK method has one argument */ | |
485 | arg_list.count = 1; | |
486 | arg_list.pointer = &arg; | |
487 | arg.type = ACPI_TYPE_INTEGER; | |
488 | arg.integer.value = dock; | |
489 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 490 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
0a918a94 TR |
491 | ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" |
492 | " _DCK\n", (char *)name_buffer.pointer)); | |
493 | ||
c8f7a62c LB |
494 | kfree(buffer.pointer); |
495 | kfree(name_buffer.pointer); | |
496 | } | |
497 | ||
498 | static inline void dock(struct dock_station *ds) | |
499 | { | |
500 | handle_dock(ds, 1); | |
501 | } | |
502 | ||
503 | static inline void undock(struct dock_station *ds) | |
504 | { | |
505 | handle_dock(ds, 0); | |
506 | } | |
507 | ||
508 | static inline void begin_dock(struct dock_station *ds) | |
509 | { | |
510 | ds->flags |= DOCK_DOCKING; | |
511 | } | |
512 | ||
513 | static inline void complete_dock(struct dock_station *ds) | |
514 | { | |
515 | ds->flags &= ~(DOCK_DOCKING); | |
516 | ds->last_dock_time = jiffies; | |
517 | } | |
518 | ||
a0cd35fd KCA |
519 | static inline void begin_undock(struct dock_station *ds) |
520 | { | |
521 | ds->flags |= DOCK_UNDOCKING; | |
522 | } | |
523 | ||
524 | static inline void complete_undock(struct dock_station *ds) | |
525 | { | |
526 | ds->flags &= ~(DOCK_UNDOCKING); | |
527 | } | |
528 | ||
406f692d SL |
529 | static void dock_lock(struct dock_station *ds, int lock) |
530 | { | |
531 | struct acpi_object_list arg_list; | |
532 | union acpi_object arg; | |
533 | acpi_status status; | |
534 | ||
535 | arg_list.count = 1; | |
536 | arg_list.pointer = &arg; | |
537 | arg.type = ACPI_TYPE_INTEGER; | |
538 | arg.integer.value = !!lock; | |
539 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
540 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
541 | if (lock) | |
542 | printk(KERN_WARNING PREFIX "Locking device failed\n"); | |
543 | else | |
544 | printk(KERN_WARNING PREFIX "Unlocking device failed\n"); | |
545 | } | |
546 | } | |
547 | ||
c8f7a62c LB |
548 | /** |
549 | * dock_in_progress - see if we are in the middle of handling a dock event | |
550 | * @ds: the dock station | |
551 | * | |
552 | * Sometimes while docking, false dock events can be sent to the driver | |
553 | * because good connections aren't made or some other reason. Ignore these | |
554 | * if we are in the middle of doing something. | |
555 | */ | |
556 | static int dock_in_progress(struct dock_station *ds) | |
557 | { | |
558 | if ((ds->flags & DOCK_DOCKING) || | |
559 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
560 | return 1; | |
561 | return 0; | |
562 | } | |
563 | ||
564 | /** | |
565 | * register_dock_notifier - add yourself to the dock notifier list | |
566 | * @nb: the callers notifier block | |
567 | * | |
568 | * If a driver wishes to be notified about dock events, they can | |
569 | * use this function to put a notifier block on the dock notifier list. | |
570 | * this notifier call chain will be called after a dock event, but | |
571 | * before hotplugging any new devices. | |
572 | */ | |
573 | int register_dock_notifier(struct notifier_block *nb) | |
574 | { | |
db350b08 | 575 | if (!dock_station_count) |
2548c06b PB |
576 | return -ENODEV; |
577 | ||
c8f7a62c LB |
578 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
579 | } | |
580 | ||
581 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
582 | ||
583 | /** | |
584 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
585 | * @nb: the callers notifier block | |
586 | */ | |
587 | void unregister_dock_notifier(struct notifier_block *nb) | |
588 | { | |
db350b08 | 589 | if (!dock_station_count) |
2548c06b PB |
590 | return; |
591 | ||
c8f7a62c LB |
592 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
593 | } | |
594 | ||
595 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
596 | ||
597 | /** | |
598 | * register_hotplug_dock_device - register a hotplug function | |
599 | * @handle: the handle of the device | |
1253f7aa | 600 | * @ops: handlers to call after docking |
c8f7a62c LB |
601 | * @context: device specific data |
602 | * | |
603 | * If a driver would like to perform a hotplug operation after a dock | |
604 | * event, they can register an acpi_notifiy_handler to be called by | |
605 | * the dock driver after _DCK is executed. | |
606 | */ | |
607 | int | |
1253f7aa | 608 | register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, |
c8f7a62c LB |
609 | void *context) |
610 | { | |
611 | struct dock_dependent_device *dd; | |
db350b08 | 612 | struct dock_station *dock_station; |
61b83695 | 613 | int ret = -EINVAL; |
c8f7a62c | 614 | |
db350b08 | 615 | if (!dock_station_count) |
c8f7a62c LB |
616 | return -ENODEV; |
617 | ||
618 | /* | |
619 | * make sure this handle is for a device dependent on the dock, | |
620 | * this would include the dock station itself | |
621 | */ | |
db350b08 | 622 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
61b83695 SL |
623 | /* |
624 | * An ATA bay can be in a dock and itself can be ejected | |
625 | * seperately, so there are two 'dock stations' which need the | |
626 | * ops | |
627 | */ | |
db350b08 SL |
628 | dd = find_dock_dependent_device(dock_station, handle); |
629 | if (dd) { | |
1253f7aa | 630 | dd->ops = ops; |
db350b08 SL |
631 | dd->context = context; |
632 | dock_add_hotplug_device(dock_station, dd); | |
61b83695 | 633 | ret = 0; |
db350b08 | 634 | } |
c8f7a62c LB |
635 | } |
636 | ||
61b83695 | 637 | return ret; |
c8f7a62c LB |
638 | } |
639 | ||
640 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
641 | ||
642 | /** | |
643 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
644 | * @handle: the acpi handle of the device | |
645 | */ | |
646 | void unregister_hotplug_dock_device(acpi_handle handle) | |
647 | { | |
648 | struct dock_dependent_device *dd; | |
db350b08 | 649 | struct dock_station *dock_station; |
c8f7a62c | 650 | |
db350b08 | 651 | if (!dock_station_count) |
c8f7a62c LB |
652 | return; |
653 | ||
db350b08 SL |
654 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
655 | dd = find_dock_dependent_device(dock_station, handle); | |
656 | if (dd) | |
657 | dock_del_hotplug_device(dock_station, dd); | |
658 | } | |
c8f7a62c LB |
659 | } |
660 | ||
661 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
662 | ||
c80fdbe8 | 663 | /** |
664 | * handle_eject_request - handle an undock request checking for error conditions | |
665 | * | |
666 | * Check to make sure the dock device is still present, then undock and | |
667 | * hotremove all the devices that may need removing. | |
668 | */ | |
669 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
670 | { | |
c80fdbe8 | 671 | if (dock_in_progress(ds)) |
672 | return -EBUSY; | |
673 | ||
674 | /* | |
675 | * here we need to generate the undock | |
676 | * event prior to actually doing the undock | |
677 | * so that the device struct still exists. | |
afd7301d HM |
678 | * Also, even send the dock event if the |
679 | * device is not present anymore | |
c80fdbe8 | 680 | */ |
681 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 682 | |
c80fdbe8 | 683 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
684 | undock(ds); | |
406f692d | 685 | dock_lock(ds, 0); |
c80fdbe8 | 686 | eject_dock(ds); |
687 | if (dock_present(ds)) { | |
688 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
689 | return -EBUSY; | |
690 | } | |
a0cd35fd | 691 | complete_undock(ds); |
c80fdbe8 | 692 | return 0; |
693 | } | |
694 | ||
c8f7a62c LB |
695 | /** |
696 | * dock_notify - act upon an acpi dock notification | |
697 | * @handle: the dock station handle | |
698 | * @event: the acpi event | |
699 | * @data: our driver data struct | |
700 | * | |
701 | * If we are notified to dock, then check to see if the dock is | |
702 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 703 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
704 | */ |
705 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
706 | { | |
50dd0969 | 707 | struct dock_station *ds = data; |
8b59560a | 708 | struct acpi_device *tmp; |
db350b08 | 709 | int surprise_removal = 0; |
c8f7a62c | 710 | |
db350b08 SL |
711 | /* |
712 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
713 | * is sent and _DCK is present, it is assumed to mean an undock | |
714 | * request. | |
715 | */ | |
716 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
717 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
718 | ||
719 | /* | |
720 | * dock station: BUS_CHECK - docked or surprise removal | |
721 | * DEVICE_CHECK - undocked | |
722 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
723 | * | |
724 | * To simplify event handling, dock dependent device handler always | |
725 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
726 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
727 | */ | |
c8f7a62c LB |
728 | switch (event) { |
729 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 730 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
731 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
732 | &tmp)) { | |
c8f7a62c LB |
733 | begin_dock(ds); |
734 | dock(ds); | |
735 | if (!dock_present(ds)) { | |
736 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
8b59560a | 737 | complete_dock(ds); |
c8f7a62c LB |
738 | break; |
739 | } | |
740 | atomic_notifier_call_chain(&dock_notifier_list, | |
741 | event, NULL); | |
742 | hotplug_dock_devices(ds, event); | |
743 | complete_dock(ds); | |
744 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 745 | dock_lock(ds, 1); |
db350b08 | 746 | break; |
c8f7a62c | 747 | } |
db350b08 SL |
748 | if (dock_present(ds) || dock_in_progress(ds)) |
749 | break; | |
750 | /* This is a surprise removal */ | |
751 | surprise_removal = 1; | |
752 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
753 | /* Fall back */ | |
c8f7a62c | 754 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 755 | begin_undock(ds); |
f730ae18 SL |
756 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
757 | || surprise_removal) | |
a0cd35fd KCA |
758 | handle_eject_request(ds, event); |
759 | else | |
760 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
761 | break; |
762 | default: | |
763 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
764 | } | |
765 | } | |
766 | ||
19cd847a ZR |
767 | struct dock_data { |
768 | acpi_handle handle; | |
769 | unsigned long event; | |
770 | struct dock_station *ds; | |
771 | }; | |
772 | ||
773 | static void acpi_dock_deferred_cb(void *context) | |
774 | { | |
775 | struct dock_data *data = (struct dock_data *)context; | |
776 | ||
777 | dock_notify(data->handle, data->event, data->ds); | |
778 | kfree(data); | |
779 | } | |
780 | ||
6bd00a61 SL |
781 | static int acpi_dock_notifier_call(struct notifier_block *this, |
782 | unsigned long event, void *data) | |
783 | { | |
784 | struct dock_station *dock_station; | |
785 | acpi_handle handle = (acpi_handle)data; | |
786 | ||
787 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
788 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
789 | return 0; | |
790 | list_for_each_entry(dock_station, &dock_stations, sibiling) { | |
791 | if (dock_station->handle == handle) { | |
19cd847a ZR |
792 | struct dock_data *dock_data; |
793 | ||
794 | dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL); | |
795 | if (!dock_data) | |
796 | return 0; | |
797 | dock_data->handle = handle; | |
798 | dock_data->event = event; | |
799 | dock_data->ds = dock_station; | |
800 | acpi_os_hotplug_execute(acpi_dock_deferred_cb, | |
801 | dock_data); | |
6bd00a61 SL |
802 | return 0 ; |
803 | } | |
804 | } | |
805 | return 0; | |
806 | } | |
807 | ||
808 | static struct notifier_block dock_acpi_notifier = { | |
809 | .notifier_call = acpi_dock_notifier_call, | |
810 | }; | |
811 | ||
c8f7a62c LB |
812 | /** |
813 | * find_dock_devices - find devices on the dock station | |
814 | * @handle: the handle of the device we are examining | |
815 | * @lvl: unused | |
816 | * @context: the dock station private data | |
817 | * @rv: unused | |
818 | * | |
819 | * This function is called by acpi_walk_namespace. It will | |
820 | * check to see if an object has an _EJD method. If it does, then it | |
821 | * will see if it is dependent on the dock station. | |
822 | */ | |
823 | static acpi_status | |
824 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
825 | { | |
826 | acpi_status status; | |
fe9a2f77 | 827 | acpi_handle tmp, parent; |
50dd0969 | 828 | struct dock_station *ds = context; |
c8f7a62c LB |
829 | struct dock_dependent_device *dd; |
830 | ||
831 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
832 | if (ACPI_FAILURE(status)) { |
833 | /* try the parent device as well */ | |
834 | status = acpi_get_parent(handle, &parent); | |
835 | if (ACPI_FAILURE(status)) | |
836 | goto fdd_out; | |
837 | /* see if parent is dependent on dock */ | |
838 | status = acpi_bus_get_ejd(parent, &tmp); | |
839 | if (ACPI_FAILURE(status)) | |
840 | goto fdd_out; | |
841 | } | |
c8f7a62c LB |
842 | |
843 | if (tmp == ds->handle) { | |
844 | dd = alloc_dock_dependent_device(handle); | |
845 | if (dd) | |
846 | add_dock_dependent_device(ds, dd); | |
847 | } | |
fe9a2f77 | 848 | fdd_out: |
c8f7a62c LB |
849 | return AE_OK; |
850 | } | |
851 | ||
c80fdbe8 | 852 | /* |
853 | * show_docked - read method for "docked" file in sysfs | |
854 | */ | |
855 | static ssize_t show_docked(struct device *dev, | |
856 | struct device_attribute *attr, char *buf) | |
857 | { | |
fc5a9f88 HM |
858 | struct acpi_device *tmp; |
859 | ||
db350b08 SL |
860 | struct dock_station *dock_station = *((struct dock_station **) |
861 | dev->platform_data); | |
c80fdbe8 | 862 | |
fc5a9f88 HM |
863 | if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) |
864 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
865 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
c80fdbe8 | 866 | } |
e5685b9d | 867 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 868 | |
a0cd35fd KCA |
869 | /* |
870 | * show_flags - read method for flags file in sysfs | |
871 | */ | |
872 | static ssize_t show_flags(struct device *dev, | |
873 | struct device_attribute *attr, char *buf) | |
874 | { | |
db350b08 SL |
875 | struct dock_station *dock_station = *((struct dock_station **) |
876 | dev->platform_data); | |
a0cd35fd KCA |
877 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
878 | ||
879 | } | |
e5685b9d | 880 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 881 | |
c80fdbe8 | 882 | /* |
883 | * write_undock - write method for "undock" file in sysfs | |
884 | */ | |
885 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
886 | const char *buf, size_t count) | |
887 | { | |
888 | int ret; | |
db350b08 SL |
889 | struct dock_station *dock_station = *((struct dock_station **) |
890 | dev->platform_data); | |
c80fdbe8 | 891 | |
892 | if (!count) | |
893 | return -EINVAL; | |
894 | ||
9171f834 | 895 | begin_undock(dock_station); |
c80fdbe8 | 896 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
897 | return ret ? ret: count; | |
898 | } | |
e5685b9d | 899 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 900 | |
ac122bb6 IVE |
901 | /* |
902 | * show_dock_uid - read method for "uid" file in sysfs | |
903 | */ | |
904 | static ssize_t show_dock_uid(struct device *dev, | |
905 | struct device_attribute *attr, char *buf) | |
906 | { | |
27663c58 | 907 | unsigned long long lbuf; |
db350b08 SL |
908 | struct dock_station *dock_station = *((struct dock_station **) |
909 | dev->platform_data); | |
38ff4ffc KCA |
910 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
911 | "_UID", NULL, &lbuf); | |
912 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 913 | return 0; |
38ff4ffc | 914 | |
27663c58 | 915 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
ac122bb6 | 916 | } |
e5685b9d | 917 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 918 | |
8652b00f SL |
919 | static ssize_t show_dock_type(struct device *dev, |
920 | struct device_attribute *attr, char *buf) | |
921 | { | |
922 | struct dock_station *dock_station = *((struct dock_station **) | |
923 | dev->platform_data); | |
924 | char *type; | |
925 | ||
926 | if (dock_station->flags & DOCK_IS_DOCK) | |
927 | type = "dock_station"; | |
928 | else if (dock_station->flags & DOCK_IS_ATA) | |
929 | type = "ata_bay"; | |
930 | else if (dock_station->flags & DOCK_IS_BAT) | |
931 | type = "battery_bay"; | |
932 | else | |
933 | type = "unknown"; | |
934 | ||
935 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
936 | } | |
937 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); | |
938 | ||
c8f7a62c LB |
939 | /** |
940 | * dock_add - add a new dock station | |
941 | * @handle: the dock station handle | |
942 | * | |
943 | * allocated and initialize a new dock station device. Find all devices | |
944 | * that are on the dock station, and register for dock event notifications. | |
945 | */ | |
946 | static int dock_add(acpi_handle handle) | |
947 | { | |
948 | int ret; | |
c8f7a62c | 949 | struct dock_dependent_device *dd; |
db350b08 SL |
950 | struct dock_station *dock_station; |
951 | struct platform_device *dock_device; | |
c8f7a62c LB |
952 | |
953 | /* allocate & initialize the dock_station private data */ | |
954 | dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); | |
955 | if (!dock_station) | |
956 | return -ENOMEM; | |
957 | dock_station->handle = handle; | |
958 | dock_station->last_dock_time = jiffies - HZ; | |
959 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
960 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
db350b08 | 961 | INIT_LIST_HEAD(&dock_station->sibiling); |
c8f7a62c | 962 | spin_lock_init(&dock_station->dd_lock); |
8b0dc866 | 963 | mutex_init(&dock_station->hp_lock); |
07a18684 | 964 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c | 965 | |
671adbec | 966 | /* initialize platform device stuff */ |
db350b08 SL |
967 | dock_station->dock_device = |
968 | platform_device_register_simple(dock_device_name, | |
969 | dock_station_count, NULL, 0); | |
970 | dock_device = dock_station->dock_device; | |
0f6f2804 | 971 | if (IS_ERR(dock_device)) { |
671adbec | 972 | kfree(dock_station); |
22fe4c21 | 973 | dock_station = NULL; |
0f6f2804 | 974 | return PTR_ERR(dock_device); |
671adbec | 975 | } |
db350b08 SL |
976 | platform_device_add_data(dock_device, &dock_station, |
977 | sizeof(struct dock_station *)); | |
a0cd35fd | 978 | |
9ef2a9a9 | 979 | /* we want the dock device to send uevents */ |
f67f129e | 980 | dev_set_uevent_suppress(&dock_device->dev, 0); |
9ef2a9a9 | 981 | |
db350b08 SL |
982 | if (is_dock(handle)) |
983 | dock_station->flags |= DOCK_IS_DOCK; | |
984 | if (is_ata(handle)) | |
985 | dock_station->flags |= DOCK_IS_ATA; | |
986 | if (is_battery(handle)) | |
987 | dock_station->flags |= DOCK_IS_BAT; | |
988 | ||
0f6f2804 | 989 | ret = device_create_file(&dock_device->dev, &dev_attr_docked); |
c80fdbe8 | 990 | if (ret) { |
4d939155 | 991 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 | 992 | platform_device_unregister(dock_device); |
c80fdbe8 | 993 | kfree(dock_station); |
22fe4c21 | 994 | dock_station = NULL; |
c80fdbe8 | 995 | return ret; |
996 | } | |
0f6f2804 | 997 | ret = device_create_file(&dock_device->dev, &dev_attr_undock); |
c80fdbe8 | 998 | if (ret) { |
4d939155 | 999 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 KCA |
1000 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1001 | platform_device_unregister(dock_device); | |
c80fdbe8 | 1002 | kfree(dock_station); |
22fe4c21 | 1003 | dock_station = NULL; |
c80fdbe8 | 1004 | return ret; |
1005 | } | |
0f6f2804 | 1006 | ret = device_create_file(&dock_device->dev, &dev_attr_uid); |
ac122bb6 | 1007 | if (ret) { |
4d939155 | 1008 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 KCA |
1009 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1010 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1011 | platform_device_unregister(dock_device); | |
ac122bb6 | 1012 | kfree(dock_station); |
22fe4c21 | 1013 | dock_station = NULL; |
ac122bb6 IVE |
1014 | return ret; |
1015 | } | |
a0cd35fd KCA |
1016 | ret = device_create_file(&dock_device->dev, &dev_attr_flags); |
1017 | if (ret) { | |
4d939155 | 1018 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
a0cd35fd KCA |
1019 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1020 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1021 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
1022 | platform_device_unregister(dock_device); | |
1023 | kfree(dock_station); | |
1024 | dock_station = NULL; | |
1025 | return ret; | |
1026 | } | |
8652b00f SL |
1027 | ret = device_create_file(&dock_device->dev, &dev_attr_type); |
1028 | if (ret) | |
1029 | printk(KERN_ERR"Error %d adding sysfs file\n", ret); | |
671adbec | 1030 | |
c8f7a62c LB |
1031 | /* Find dependent devices */ |
1032 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1033 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
1034 | NULL); | |
1035 | ||
1036 | /* add the dock station as a device dependent on itself */ | |
1037 | dd = alloc_dock_dependent_device(handle); | |
1038 | if (!dd) { | |
1039 | kfree(dock_station); | |
22fe4c21 | 1040 | dock_station = NULL; |
671adbec KCA |
1041 | ret = -ENOMEM; |
1042 | goto dock_add_err_unregister; | |
c8f7a62c LB |
1043 | } |
1044 | add_dock_dependent_device(dock_station, dd); | |
1045 | ||
db350b08 SL |
1046 | dock_station_count++; |
1047 | list_add(&dock_station->sibiling, &dock_stations); | |
c8f7a62c LB |
1048 | return 0; |
1049 | ||
671adbec | 1050 | dock_add_err_unregister: |
8652b00f | 1051 | device_remove_file(&dock_device->dev, &dev_attr_type); |
0f6f2804 KCA |
1052 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1053 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1054 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1055 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1056 | platform_device_unregister(dock_device); |
671adbec | 1057 | kfree(dock_station); |
22fe4c21 | 1058 | dock_station = NULL; |
c8f7a62c LB |
1059 | return ret; |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * dock_remove - free up resources related to the dock station | |
1064 | */ | |
db350b08 | 1065 | static int dock_remove(struct dock_station *dock_station) |
c8f7a62c LB |
1066 | { |
1067 | struct dock_dependent_device *dd, *tmp; | |
db350b08 | 1068 | struct platform_device *dock_device = dock_station->dock_device; |
c8f7a62c | 1069 | |
db350b08 | 1070 | if (!dock_station_count) |
c8f7a62c LB |
1071 | return 0; |
1072 | ||
1073 | /* remove dependent devices */ | |
1074 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
1075 | list) | |
1076 | kfree(dd); | |
1077 | ||
671adbec | 1078 | /* cleanup sysfs */ |
8652b00f | 1079 | device_remove_file(&dock_device->dev, &dev_attr_type); |
0f6f2804 KCA |
1080 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1081 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1082 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1083 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1084 | platform_device_unregister(dock_device); |
671adbec | 1085 | |
c8f7a62c LB |
1086 | /* free dock station memory */ |
1087 | kfree(dock_station); | |
22fe4c21 | 1088 | dock_station = NULL; |
c8f7a62c LB |
1089 | return 0; |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * find_dock - look for a dock station | |
1094 | * @handle: acpi handle of a device | |
1095 | * @lvl: unused | |
1096 | * @context: counter of dock stations found | |
1097 | * @rv: unused | |
1098 | * | |
1099 | * This is called by acpi_walk_namespace to look for dock stations. | |
1100 | */ | |
1101 | static acpi_status | |
1102 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
1103 | { | |
c8f7a62c LB |
1104 | acpi_status status = AE_OK; |
1105 | ||
1106 | if (is_dock(handle)) { | |
1107 | if (dock_add(handle) >= 0) { | |
c8f7a62c LB |
1108 | status = AE_CTRL_TERMINATE; |
1109 | } | |
1110 | } | |
1111 | return status; | |
1112 | } | |
1113 | ||
db350b08 SL |
1114 | static acpi_status |
1115 | find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) | |
c8f7a62c | 1116 | { |
61b83695 SL |
1117 | /* If bay is a dock, it's already handled */ |
1118 | if (is_ejectable_bay(handle) && !is_dock(handle)) | |
db350b08 SL |
1119 | dock_add(handle); |
1120 | return AE_OK; | |
1121 | } | |
c8f7a62c | 1122 | |
db350b08 SL |
1123 | static int __init dock_init(void) |
1124 | { | |
816c2eda LB |
1125 | if (acpi_disabled) |
1126 | return 0; | |
1127 | ||
c8f7a62c LB |
1128 | /* look for a dock station */ |
1129 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
db350b08 | 1130 | ACPI_UINT32_MAX, find_dock, NULL, NULL); |
c8f7a62c | 1131 | |
db350b08 SL |
1132 | /* look for bay */ |
1133 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1134 | ACPI_UINT32_MAX, find_bay, NULL, NULL); | |
1135 | if (!dock_station_count) { | |
1136 | printk(KERN_INFO PREFIX "No dock devices found.\n"); | |
1137 | return 0; | |
1138 | } | |
c8f7a62c | 1139 | |
6bd00a61 | 1140 | register_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1141 | printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
1142 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); | |
c8f7a62c LB |
1143 | return 0; |
1144 | } | |
1145 | ||
1146 | static void __exit dock_exit(void) | |
1147 | { | |
db350b08 | 1148 | struct dock_station *dock_station; |
f2407298 | 1149 | struct dock_station *tmp; |
db350b08 | 1150 | |
6bd00a61 | 1151 | unregister_acpi_bus_notifier(&dock_acpi_notifier); |
f2407298 | 1152 | list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibiling) |
db350b08 | 1153 | dock_remove(dock_station); |
c8f7a62c LB |
1154 | } |
1155 | ||
db350b08 SL |
1156 | /* |
1157 | * Must be called before drivers of devices in dock, otherwise we can't know | |
1158 | * which devices are in a dock | |
1159 | */ | |
1160 | subsys_initcall(dock_init); | |
c8f7a62c | 1161 | module_exit(dock_exit); |