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c8f7a62c LB |
1 | /* |
2 | * dock.c - ACPI dock station driver | |
3 | * | |
4 | * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> | |
5 | * | |
6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or (at | |
11 | * your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | * | |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/notifier.h> | |
671adbec | 30 | #include <linux/platform_device.h> |
914e2637 | 31 | #include <linux/jiffies.h> |
62a6d7fd | 32 | #include <linux/stddef.h> |
c8f7a62c LB |
33 | #include <acpi/acpi_bus.h> |
34 | #include <acpi/acpi_drivers.h> | |
35 | ||
a192a958 LB |
36 | #define PREFIX "ACPI: " |
37 | ||
7cda93e0 | 38 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
c8f7a62c | 39 | |
f52fd66d | 40 | ACPI_MODULE_NAME("dock"); |
c8f7a62c | 41 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
7cda93e0 | 42 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
43 | MODULE_LICENSE("GPL"); |
44 | ||
a0cd35fd KCA |
45 | static int immediate_undock = 1; |
46 | module_param(immediate_undock, bool, 0644); | |
47 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " | |
48 | "undock immediately when the undock button is pressed, 0 will cause" | |
49 | " the driver to wait for userspace to write the undock sysfs file " | |
50 | " before undocking"); | |
51 | ||
c8f7a62c | 52 | static struct atomic_notifier_head dock_notifier_list; |
671adbec | 53 | static char dock_device_name[] = "dock"; |
c8f7a62c | 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 SL |
69 | |
70 | struct list_head sibiling; | |
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; | |
1253f7aa | 80 | 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 | /** | |
96 | * alloc_dock_dependent_device - allocate and init a dependent device | |
97 | * @handle: the acpi_handle of the dependent device | |
98 | * | |
99 | * Allocate memory for a dependent device structure for a device referenced | |
100 | * by the acpi handle | |
101 | */ | |
102 | static struct dock_dependent_device * | |
103 | alloc_dock_dependent_device(acpi_handle handle) | |
104 | { | |
105 | struct dock_dependent_device *dd; | |
106 | ||
107 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
108 | if (dd) { | |
109 | dd->handle = handle; | |
110 | INIT_LIST_HEAD(&dd->list); | |
111 | INIT_LIST_HEAD(&dd->hotplug_list); | |
112 | } | |
113 | return dd; | |
114 | } | |
115 | ||
116 | /** | |
117 | * add_dock_dependent_device - associate a device with the dock station | |
118 | * @ds: The dock station | |
119 | * @dd: The dependent device | |
120 | * | |
121 | * Add the dependent device to the dock's dependent device list. | |
122 | */ | |
123 | static void | |
124 | add_dock_dependent_device(struct dock_station *ds, | |
125 | struct dock_dependent_device *dd) | |
126 | { | |
127 | spin_lock(&ds->dd_lock); | |
128 | list_add_tail(&dd->list, &ds->dependent_devices); | |
129 | spin_unlock(&ds->dd_lock); | |
130 | } | |
131 | ||
132 | /** | |
133 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
134 | * @ds: The dock station | |
135 | * @dd: The dependent device struct | |
136 | * | |
137 | * Add the dependent device to the dock's hotplug device list | |
138 | */ | |
139 | static void | |
140 | dock_add_hotplug_device(struct dock_station *ds, | |
141 | struct dock_dependent_device *dd) | |
142 | { | |
8b0dc866 | 143 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 144 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
8b0dc866 | 145 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
146 | } |
147 | ||
148 | /** | |
149 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
150 | * @ds: The dock station | |
151 | * @dd: the dependent device struct | |
152 | * | |
153 | * Delete the dependent device from the dock's hotplug device list | |
154 | */ | |
155 | static void | |
156 | dock_del_hotplug_device(struct dock_station *ds, | |
157 | struct dock_dependent_device *dd) | |
158 | { | |
8b0dc866 | 159 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 160 | list_del(&dd->hotplug_list); |
8b0dc866 | 161 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
162 | } |
163 | ||
164 | /** | |
165 | * find_dock_dependent_device - get a device dependent on this dock | |
166 | * @ds: the dock station | |
167 | * @handle: the acpi_handle of the device we want | |
168 | * | |
169 | * iterate over the dependent device list for this dock. If the | |
170 | * dependent device matches the handle, return. | |
171 | */ | |
172 | static struct dock_dependent_device * | |
173 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
174 | { | |
175 | struct dock_dependent_device *dd; | |
176 | ||
177 | spin_lock(&ds->dd_lock); | |
178 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
179 | if (handle == dd->handle) { | |
180 | spin_unlock(&ds->dd_lock); | |
181 | return dd; | |
182 | } | |
183 | } | |
184 | spin_unlock(&ds->dd_lock); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | /***************************************************************************** | |
189 | * Dock functions * | |
190 | *****************************************************************************/ | |
191 | /** | |
192 | * is_dock - see if a device is a dock station | |
193 | * @handle: acpi handle of the device | |
194 | * | |
195 | * If an acpi object has a _DCK method, then it is by definition a dock | |
196 | * station, so return true. | |
197 | */ | |
198 | static int is_dock(acpi_handle handle) | |
199 | { | |
200 | acpi_status status; | |
201 | acpi_handle tmp; | |
202 | ||
203 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
204 | if (ACPI_FAILURE(status)) | |
205 | return 0; | |
206 | return 1; | |
207 | } | |
208 | ||
db350b08 SL |
209 | static int is_ejectable(acpi_handle handle) |
210 | { | |
211 | acpi_status status; | |
212 | acpi_handle tmp; | |
213 | ||
214 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
215 | if (ACPI_FAILURE(status)) | |
216 | return 0; | |
217 | return 1; | |
218 | } | |
219 | ||
220 | static int is_ata(acpi_handle handle) | |
221 | { | |
222 | acpi_handle tmp; | |
223 | ||
224 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || | |
225 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || | |
226 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || | |
227 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) | |
228 | return 1; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int is_battery(acpi_handle handle) | |
234 | { | |
235 | struct acpi_device_info *info; | |
236 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
237 | int ret = 1; | |
238 | ||
239 | if (!ACPI_SUCCESS(acpi_get_object_info(handle, &buffer))) | |
240 | return 0; | |
241 | info = buffer.pointer; | |
242 | if (!(info->valid & ACPI_VALID_HID)) | |
243 | ret = 0; | |
244 | else | |
245 | ret = !strcmp("PNP0C0A", info->hardware_id.value); | |
246 | ||
247 | kfree(buffer.pointer); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | static int is_ejectable_bay(acpi_handle handle) | |
252 | { | |
253 | acpi_handle phandle; | |
254 | if (!is_ejectable(handle)) | |
255 | return 0; | |
256 | if (is_battery(handle) || is_ata(handle)) | |
257 | return 1; | |
258 | if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) | |
259 | return 1; | |
260 | return 0; | |
261 | } | |
262 | ||
c8f7a62c LB |
263 | /** |
264 | * is_dock_device - see if a device is on a dock station | |
265 | * @handle: acpi handle of the device | |
266 | * | |
267 | * If this device is either the dock station itself, | |
268 | * or is a device dependent on the dock station, then it | |
269 | * is a dock device | |
270 | */ | |
271 | int is_dock_device(acpi_handle handle) | |
272 | { | |
db350b08 SL |
273 | struct dock_station *dock_station; |
274 | ||
275 | if (!dock_station_count) | |
c8f7a62c LB |
276 | return 0; |
277 | ||
db350b08 | 278 | if (is_dock(handle)) |
c8f7a62c | 279 | return 1; |
db350b08 SL |
280 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
281 | if (find_dock_dependent_device(dock_station, handle)) | |
282 | return 1; | |
283 | } | |
c8f7a62c LB |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
288 | EXPORT_SYMBOL_GPL(is_dock_device); | |
289 | ||
290 | /** | |
291 | * dock_present - see if the dock station is present. | |
292 | * @ds: the dock station | |
293 | * | |
294 | * execute the _STA method. note that present does not | |
295 | * imply that we are docked. | |
296 | */ | |
297 | static int dock_present(struct dock_station *ds) | |
298 | { | |
27663c58 | 299 | unsigned long long sta; |
c8f7a62c LB |
300 | acpi_status status; |
301 | ||
302 | if (ds) { | |
303 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
304 | if (ACPI_SUCCESS(status) && sta) | |
305 | return 1; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | ||
311 | ||
312 | /** | |
313 | * dock_create_acpi_device - add new devices to acpi | |
314 | * @handle - handle of the device to add | |
315 | * | |
316 | * This function will create a new acpi_device for the given | |
317 | * handle if one does not exist already. This should cause | |
318 | * acpi to scan for drivers for the given devices, and call | |
319 | * matching driver's add routine. | |
320 | * | |
321 | * Returns a pointer to the acpi_device corresponding to the handle. | |
322 | */ | |
323 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
324 | { | |
325 | struct acpi_device *device = NULL; | |
326 | struct acpi_device *parent_device; | |
327 | acpi_handle parent; | |
328 | int ret; | |
329 | ||
330 | if (acpi_bus_get_device(handle, &device)) { | |
331 | /* | |
332 | * no device created for this object, | |
333 | * so we should create one. | |
334 | */ | |
335 | acpi_get_parent(handle, &parent); | |
336 | if (acpi_bus_get_device(parent, &parent_device)) | |
337 | parent_device = NULL; | |
338 | ||
339 | ret = acpi_bus_add(&device, parent_device, handle, | |
340 | ACPI_BUS_TYPE_DEVICE); | |
341 | if (ret) { | |
342 | pr_debug("error adding bus, %x\n", | |
343 | -ret); | |
344 | return NULL; | |
345 | } | |
346 | } | |
347 | return device; | |
348 | } | |
349 | ||
350 | /** | |
351 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
352 | * @handle - the handle of the device to remove | |
353 | * | |
354 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
355 | * driver to have it's remove routine called. | |
356 | */ | |
357 | static void dock_remove_acpi_device(acpi_handle handle) | |
358 | { | |
359 | struct acpi_device *device; | |
360 | int ret; | |
361 | ||
362 | if (!acpi_bus_get_device(handle, &device)) { | |
363 | ret = acpi_bus_trim(device, 1); | |
364 | if (ret) | |
365 | pr_debug("error removing bus, %x\n", -ret); | |
366 | } | |
367 | } | |
368 | ||
369 | ||
370 | /** | |
371 | * hotplug_dock_devices - insert or remove devices on the dock station | |
372 | * @ds: the dock station | |
373 | * @event: either bus check or eject request | |
374 | * | |
375 | * Some devices on the dock station need to have drivers called | |
376 | * to perform hotplug operations after a dock event has occurred. | |
377 | * Traverse the list of dock devices that have registered a | |
378 | * hotplug handler, and call the handler. | |
379 | */ | |
380 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
381 | { | |
382 | struct dock_dependent_device *dd; | |
383 | ||
8b0dc866 | 384 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
385 | |
386 | /* | |
387 | * First call driver specific hotplug functions | |
388 | */ | |
389 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { | |
1253f7aa SL |
390 | if (dd->ops && dd->ops->handler) |
391 | dd->ops->handler(dd->handle, event, dd->context); | |
c8f7a62c LB |
392 | } |
393 | ||
394 | /* | |
395 | * Now make sure that an acpi_device is created for each | |
396 | * dependent device, or removed if this is an eject request. | |
397 | * This will cause acpi_drivers to be stopped/started if they | |
398 | * exist | |
399 | */ | |
400 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
401 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
402 | dock_remove_acpi_device(dd->handle); | |
403 | else | |
404 | dock_create_acpi_device(dd->handle); | |
405 | } | |
8b0dc866 | 406 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
407 | } |
408 | ||
409 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
410 | { | |
db350b08 | 411 | struct device *dev = &ds->dock_device->dev; |
66b56821 | 412 | char event_string[13]; |
79a8f70b | 413 | char *envp[] = { event_string, NULL }; |
1253f7aa | 414 | struct dock_dependent_device *dd; |
79a8f70b KCA |
415 | |
416 | if (num == UNDOCK_EVENT) | |
66b56821 | 417 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 418 | else |
66b56821 | 419 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 420 | |
5669021e | 421 | /* |
8ea86e0b KCA |
422 | * Indicate that the status of the dock station has |
423 | * changed. | |
5669021e | 424 | */ |
1253f7aa SL |
425 | if (num == DOCK_EVENT) |
426 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
427 | ||
428 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) | |
429 | if (dd->ops && dd->ops->uevent) | |
430 | dd->ops->uevent(dd->handle, event, dd->context); | |
431 | if (num != DOCK_EVENT) | |
432 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
c8f7a62c LB |
433 | } |
434 | ||
435 | /** | |
436 | * eject_dock - respond to a dock eject request | |
437 | * @ds: the dock station | |
438 | * | |
439 | * This is called after _DCK is called, to execute the dock station's | |
440 | * _EJ0 method. | |
441 | */ | |
442 | static void eject_dock(struct dock_station *ds) | |
443 | { | |
444 | struct acpi_object_list arg_list; | |
445 | union acpi_object arg; | |
446 | acpi_status status; | |
447 | acpi_handle tmp; | |
448 | ||
449 | /* all dock devices should have _EJ0, but check anyway */ | |
450 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
451 | if (ACPI_FAILURE(status)) { | |
452 | pr_debug("No _EJ0 support for dock device\n"); | |
453 | return; | |
454 | } | |
455 | ||
456 | arg_list.count = 1; | |
457 | arg_list.pointer = &arg; | |
458 | arg.type = ACPI_TYPE_INTEGER; | |
459 | arg.integer.value = 1; | |
460 | ||
461 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
462 | &arg_list, NULL))) | |
463 | pr_debug("Failed to evaluate _EJ0!\n"); | |
464 | } | |
465 | ||
466 | /** | |
467 | * handle_dock - handle a dock event | |
468 | * @ds: the dock station | |
469 | * @dock: to dock, or undock - that is the question | |
470 | * | |
471 | * Execute the _DCK method in response to an acpi event | |
472 | */ | |
473 | static void handle_dock(struct dock_station *ds, int dock) | |
474 | { | |
475 | acpi_status status; | |
476 | struct acpi_object_list arg_list; | |
477 | union acpi_object arg; | |
478 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
479 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c LB |
480 | |
481 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
c8f7a62c | 482 | |
9254bc84 DT |
483 | printk(KERN_INFO PREFIX "%s - %s\n", |
484 | (char *)name_buffer.pointer, dock ? "docking" : "undocking"); | |
c8f7a62c LB |
485 | |
486 | /* _DCK method has one argument */ | |
487 | arg_list.count = 1; | |
488 | arg_list.pointer = &arg; | |
489 | arg.type = ACPI_TYPE_INTEGER; | |
490 | arg.integer.value = dock; | |
491 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 492 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
0a918a94 TR |
493 | ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" |
494 | " _DCK\n", (char *)name_buffer.pointer)); | |
495 | ||
c8f7a62c LB |
496 | kfree(buffer.pointer); |
497 | kfree(name_buffer.pointer); | |
498 | } | |
499 | ||
500 | static inline void dock(struct dock_station *ds) | |
501 | { | |
502 | handle_dock(ds, 1); | |
503 | } | |
504 | ||
505 | static inline void undock(struct dock_station *ds) | |
506 | { | |
507 | handle_dock(ds, 0); | |
508 | } | |
509 | ||
510 | static inline void begin_dock(struct dock_station *ds) | |
511 | { | |
512 | ds->flags |= DOCK_DOCKING; | |
513 | } | |
514 | ||
515 | static inline void complete_dock(struct dock_station *ds) | |
516 | { | |
517 | ds->flags &= ~(DOCK_DOCKING); | |
518 | ds->last_dock_time = jiffies; | |
519 | } | |
520 | ||
a0cd35fd KCA |
521 | static inline void begin_undock(struct dock_station *ds) |
522 | { | |
523 | ds->flags |= DOCK_UNDOCKING; | |
524 | } | |
525 | ||
526 | static inline void complete_undock(struct dock_station *ds) | |
527 | { | |
528 | ds->flags &= ~(DOCK_UNDOCKING); | |
529 | } | |
530 | ||
406f692d SL |
531 | static void dock_lock(struct dock_station *ds, int lock) |
532 | { | |
533 | struct acpi_object_list arg_list; | |
534 | union acpi_object arg; | |
535 | acpi_status status; | |
536 | ||
537 | arg_list.count = 1; | |
538 | arg_list.pointer = &arg; | |
539 | arg.type = ACPI_TYPE_INTEGER; | |
540 | arg.integer.value = !!lock; | |
541 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
542 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
543 | if (lock) | |
544 | printk(KERN_WARNING PREFIX "Locking device failed\n"); | |
545 | else | |
546 | printk(KERN_WARNING PREFIX "Unlocking device failed\n"); | |
547 | } | |
548 | } | |
549 | ||
c8f7a62c LB |
550 | /** |
551 | * dock_in_progress - see if we are in the middle of handling a dock event | |
552 | * @ds: the dock station | |
553 | * | |
554 | * Sometimes while docking, false dock events can be sent to the driver | |
555 | * because good connections aren't made or some other reason. Ignore these | |
556 | * if we are in the middle of doing something. | |
557 | */ | |
558 | static int dock_in_progress(struct dock_station *ds) | |
559 | { | |
560 | if ((ds->flags & DOCK_DOCKING) || | |
561 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
562 | return 1; | |
563 | return 0; | |
564 | } | |
565 | ||
566 | /** | |
567 | * register_dock_notifier - add yourself to the dock notifier list | |
568 | * @nb: the callers notifier block | |
569 | * | |
570 | * If a driver wishes to be notified about dock events, they can | |
571 | * use this function to put a notifier block on the dock notifier list. | |
572 | * this notifier call chain will be called after a dock event, but | |
573 | * before hotplugging any new devices. | |
574 | */ | |
575 | int register_dock_notifier(struct notifier_block *nb) | |
576 | { | |
db350b08 | 577 | if (!dock_station_count) |
2548c06b PB |
578 | return -ENODEV; |
579 | ||
c8f7a62c LB |
580 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
581 | } | |
582 | ||
583 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
584 | ||
585 | /** | |
586 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
587 | * @nb: the callers notifier block | |
588 | */ | |
589 | void unregister_dock_notifier(struct notifier_block *nb) | |
590 | { | |
db350b08 | 591 | if (!dock_station_count) |
2548c06b PB |
592 | return; |
593 | ||
c8f7a62c LB |
594 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
595 | } | |
596 | ||
597 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
598 | ||
599 | /** | |
600 | * register_hotplug_dock_device - register a hotplug function | |
601 | * @handle: the handle of the device | |
1253f7aa | 602 | * @ops: handlers to call after docking |
c8f7a62c LB |
603 | * @context: device specific data |
604 | * | |
605 | * If a driver would like to perform a hotplug operation after a dock | |
606 | * event, they can register an acpi_notifiy_handler to be called by | |
607 | * the dock driver after _DCK is executed. | |
608 | */ | |
609 | int | |
1253f7aa | 610 | register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, |
c8f7a62c LB |
611 | void *context) |
612 | { | |
613 | struct dock_dependent_device *dd; | |
db350b08 | 614 | struct dock_station *dock_station; |
61b83695 | 615 | int ret = -EINVAL; |
c8f7a62c | 616 | |
db350b08 | 617 | if (!dock_station_count) |
c8f7a62c LB |
618 | return -ENODEV; |
619 | ||
620 | /* | |
621 | * make sure this handle is for a device dependent on the dock, | |
622 | * this would include the dock station itself | |
623 | */ | |
db350b08 | 624 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
61b83695 SL |
625 | /* |
626 | * An ATA bay can be in a dock and itself can be ejected | |
627 | * seperately, so there are two 'dock stations' which need the | |
628 | * ops | |
629 | */ | |
db350b08 SL |
630 | dd = find_dock_dependent_device(dock_station, handle); |
631 | if (dd) { | |
1253f7aa | 632 | dd->ops = ops; |
db350b08 SL |
633 | dd->context = context; |
634 | dock_add_hotplug_device(dock_station, dd); | |
61b83695 | 635 | ret = 0; |
db350b08 | 636 | } |
c8f7a62c LB |
637 | } |
638 | ||
61b83695 | 639 | return ret; |
c8f7a62c LB |
640 | } |
641 | ||
642 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
643 | ||
644 | /** | |
645 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
646 | * @handle: the acpi handle of the device | |
647 | */ | |
648 | void unregister_hotplug_dock_device(acpi_handle handle) | |
649 | { | |
650 | struct dock_dependent_device *dd; | |
db350b08 | 651 | struct dock_station *dock_station; |
c8f7a62c | 652 | |
db350b08 | 653 | if (!dock_station_count) |
c8f7a62c LB |
654 | return; |
655 | ||
db350b08 SL |
656 | list_for_each_entry(dock_station, &dock_stations, sibiling) { |
657 | dd = find_dock_dependent_device(dock_station, handle); | |
658 | if (dd) | |
659 | dock_del_hotplug_device(dock_station, dd); | |
660 | } | |
c8f7a62c LB |
661 | } |
662 | ||
663 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
664 | ||
c80fdbe8 | 665 | /** |
666 | * handle_eject_request - handle an undock request checking for error conditions | |
667 | * | |
668 | * Check to make sure the dock device is still present, then undock and | |
669 | * hotremove all the devices that may need removing. | |
670 | */ | |
671 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
672 | { | |
c80fdbe8 | 673 | if (dock_in_progress(ds)) |
674 | return -EBUSY; | |
675 | ||
676 | /* | |
677 | * here we need to generate the undock | |
678 | * event prior to actually doing the undock | |
679 | * so that the device struct still exists. | |
afd7301d HM |
680 | * Also, even send the dock event if the |
681 | * device is not present anymore | |
c80fdbe8 | 682 | */ |
683 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 684 | |
c80fdbe8 | 685 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
686 | undock(ds); | |
406f692d | 687 | dock_lock(ds, 0); |
c80fdbe8 | 688 | eject_dock(ds); |
689 | if (dock_present(ds)) { | |
690 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
691 | return -EBUSY; | |
692 | } | |
a0cd35fd | 693 | complete_undock(ds); |
c80fdbe8 | 694 | return 0; |
695 | } | |
696 | ||
c8f7a62c LB |
697 | /** |
698 | * dock_notify - act upon an acpi dock notification | |
699 | * @handle: the dock station handle | |
700 | * @event: the acpi event | |
701 | * @data: our driver data struct | |
702 | * | |
703 | * If we are notified to dock, then check to see if the dock is | |
704 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 705 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
706 | */ |
707 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
708 | { | |
50dd0969 | 709 | struct dock_station *ds = data; |
8b59560a | 710 | struct acpi_device *tmp; |
db350b08 | 711 | int surprise_removal = 0; |
c8f7a62c | 712 | |
db350b08 SL |
713 | /* |
714 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
715 | * is sent and _DCK is present, it is assumed to mean an undock | |
716 | * request. | |
717 | */ | |
718 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
719 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
720 | ||
721 | /* | |
722 | * dock station: BUS_CHECK - docked or surprise removal | |
723 | * DEVICE_CHECK - undocked | |
724 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
725 | * | |
726 | * To simplify event handling, dock dependent device handler always | |
727 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
728 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
729 | */ | |
c8f7a62c LB |
730 | switch (event) { |
731 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 732 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
733 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
734 | &tmp)) { | |
c8f7a62c LB |
735 | begin_dock(ds); |
736 | dock(ds); | |
737 | if (!dock_present(ds)) { | |
738 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
8b59560a | 739 | complete_dock(ds); |
c8f7a62c LB |
740 | break; |
741 | } | |
742 | atomic_notifier_call_chain(&dock_notifier_list, | |
743 | event, NULL); | |
744 | hotplug_dock_devices(ds, event); | |
745 | complete_dock(ds); | |
746 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 747 | dock_lock(ds, 1); |
db350b08 | 748 | break; |
c8f7a62c | 749 | } |
db350b08 SL |
750 | if (dock_present(ds) || dock_in_progress(ds)) |
751 | break; | |
752 | /* This is a surprise removal */ | |
753 | surprise_removal = 1; | |
754 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
755 | /* Fall back */ | |
c8f7a62c | 756 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 757 | begin_undock(ds); |
f730ae18 SL |
758 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
759 | || surprise_removal) | |
a0cd35fd KCA |
760 | handle_eject_request(ds, event); |
761 | else | |
762 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
763 | break; |
764 | default: | |
765 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
766 | } | |
767 | } | |
768 | ||
19cd847a ZR |
769 | struct dock_data { |
770 | acpi_handle handle; | |
771 | unsigned long event; | |
772 | struct dock_station *ds; | |
773 | }; | |
774 | ||
775 | static void acpi_dock_deferred_cb(void *context) | |
776 | { | |
777 | struct dock_data *data = (struct dock_data *)context; | |
778 | ||
779 | dock_notify(data->handle, data->event, data->ds); | |
780 | kfree(data); | |
781 | } | |
782 | ||
6bd00a61 SL |
783 | static int acpi_dock_notifier_call(struct notifier_block *this, |
784 | unsigned long event, void *data) | |
785 | { | |
786 | struct dock_station *dock_station; | |
787 | acpi_handle handle = (acpi_handle)data; | |
788 | ||
789 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
790 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
791 | return 0; | |
792 | list_for_each_entry(dock_station, &dock_stations, sibiling) { | |
793 | if (dock_station->handle == handle) { | |
19cd847a ZR |
794 | struct dock_data *dock_data; |
795 | ||
796 | dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL); | |
797 | if (!dock_data) | |
798 | return 0; | |
799 | dock_data->handle = handle; | |
800 | dock_data->event = event; | |
801 | dock_data->ds = dock_station; | |
802 | acpi_os_hotplug_execute(acpi_dock_deferred_cb, | |
803 | dock_data); | |
6bd00a61 SL |
804 | return 0 ; |
805 | } | |
806 | } | |
807 | return 0; | |
808 | } | |
809 | ||
810 | static struct notifier_block dock_acpi_notifier = { | |
811 | .notifier_call = acpi_dock_notifier_call, | |
812 | }; | |
813 | ||
c8f7a62c LB |
814 | /** |
815 | * find_dock_devices - find devices on the dock station | |
816 | * @handle: the handle of the device we are examining | |
817 | * @lvl: unused | |
818 | * @context: the dock station private data | |
819 | * @rv: unused | |
820 | * | |
821 | * This function is called by acpi_walk_namespace. It will | |
822 | * check to see if an object has an _EJD method. If it does, then it | |
823 | * will see if it is dependent on the dock station. | |
824 | */ | |
825 | static acpi_status | |
826 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
827 | { | |
828 | acpi_status status; | |
fe9a2f77 | 829 | acpi_handle tmp, parent; |
50dd0969 | 830 | struct dock_station *ds = context; |
c8f7a62c LB |
831 | struct dock_dependent_device *dd; |
832 | ||
833 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
834 | if (ACPI_FAILURE(status)) { |
835 | /* try the parent device as well */ | |
836 | status = acpi_get_parent(handle, &parent); | |
837 | if (ACPI_FAILURE(status)) | |
838 | goto fdd_out; | |
839 | /* see if parent is dependent on dock */ | |
840 | status = acpi_bus_get_ejd(parent, &tmp); | |
841 | if (ACPI_FAILURE(status)) | |
842 | goto fdd_out; | |
843 | } | |
c8f7a62c LB |
844 | |
845 | if (tmp == ds->handle) { | |
846 | dd = alloc_dock_dependent_device(handle); | |
847 | if (dd) | |
848 | add_dock_dependent_device(ds, dd); | |
849 | } | |
fe9a2f77 | 850 | fdd_out: |
c8f7a62c LB |
851 | return AE_OK; |
852 | } | |
853 | ||
c80fdbe8 | 854 | /* |
855 | * show_docked - read method for "docked" file in sysfs | |
856 | */ | |
857 | static ssize_t show_docked(struct device *dev, | |
858 | struct device_attribute *attr, char *buf) | |
859 | { | |
fc5a9f88 HM |
860 | struct acpi_device *tmp; |
861 | ||
db350b08 SL |
862 | struct dock_station *dock_station = *((struct dock_station **) |
863 | dev->platform_data); | |
c80fdbe8 | 864 | |
fc5a9f88 HM |
865 | if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) |
866 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
867 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
c80fdbe8 | 868 | } |
e5685b9d | 869 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 870 | |
a0cd35fd KCA |
871 | /* |
872 | * show_flags - read method for flags file in sysfs | |
873 | */ | |
874 | static ssize_t show_flags(struct device *dev, | |
875 | struct device_attribute *attr, char *buf) | |
876 | { | |
db350b08 SL |
877 | struct dock_station *dock_station = *((struct dock_station **) |
878 | dev->platform_data); | |
a0cd35fd KCA |
879 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
880 | ||
881 | } | |
e5685b9d | 882 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 883 | |
c80fdbe8 | 884 | /* |
885 | * write_undock - write method for "undock" file in sysfs | |
886 | */ | |
887 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
888 | const char *buf, size_t count) | |
889 | { | |
890 | int ret; | |
db350b08 SL |
891 | struct dock_station *dock_station = *((struct dock_station **) |
892 | dev->platform_data); | |
c80fdbe8 | 893 | |
894 | if (!count) | |
895 | return -EINVAL; | |
896 | ||
9171f834 | 897 | begin_undock(dock_station); |
c80fdbe8 | 898 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
899 | return ret ? ret: count; | |
900 | } | |
e5685b9d | 901 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 902 | |
ac122bb6 IVE |
903 | /* |
904 | * show_dock_uid - read method for "uid" file in sysfs | |
905 | */ | |
906 | static ssize_t show_dock_uid(struct device *dev, | |
907 | struct device_attribute *attr, char *buf) | |
908 | { | |
27663c58 | 909 | unsigned long long lbuf; |
db350b08 SL |
910 | struct dock_station *dock_station = *((struct dock_station **) |
911 | dev->platform_data); | |
38ff4ffc KCA |
912 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
913 | "_UID", NULL, &lbuf); | |
914 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 915 | return 0; |
38ff4ffc | 916 | |
27663c58 | 917 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
ac122bb6 | 918 | } |
e5685b9d | 919 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 920 | |
8652b00f SL |
921 | static ssize_t show_dock_type(struct device *dev, |
922 | struct device_attribute *attr, char *buf) | |
923 | { | |
924 | struct dock_station *dock_station = *((struct dock_station **) | |
925 | dev->platform_data); | |
926 | char *type; | |
927 | ||
928 | if (dock_station->flags & DOCK_IS_DOCK) | |
929 | type = "dock_station"; | |
930 | else if (dock_station->flags & DOCK_IS_ATA) | |
931 | type = "ata_bay"; | |
932 | else if (dock_station->flags & DOCK_IS_BAT) | |
933 | type = "battery_bay"; | |
934 | else | |
935 | type = "unknown"; | |
936 | ||
937 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
938 | } | |
939 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); | |
940 | ||
c8f7a62c LB |
941 | /** |
942 | * dock_add - add a new dock station | |
943 | * @handle: the dock station handle | |
944 | * | |
945 | * allocated and initialize a new dock station device. Find all devices | |
946 | * that are on the dock station, and register for dock event notifications. | |
947 | */ | |
948 | static int dock_add(acpi_handle handle) | |
949 | { | |
950 | int ret; | |
c8f7a62c | 951 | struct dock_dependent_device *dd; |
db350b08 SL |
952 | struct dock_station *dock_station; |
953 | struct platform_device *dock_device; | |
c8f7a62c LB |
954 | |
955 | /* allocate & initialize the dock_station private data */ | |
956 | dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); | |
957 | if (!dock_station) | |
958 | return -ENOMEM; | |
959 | dock_station->handle = handle; | |
960 | dock_station->last_dock_time = jiffies - HZ; | |
961 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
962 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
db350b08 | 963 | INIT_LIST_HEAD(&dock_station->sibiling); |
c8f7a62c | 964 | spin_lock_init(&dock_station->dd_lock); |
8b0dc866 | 965 | mutex_init(&dock_station->hp_lock); |
07a18684 | 966 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c | 967 | |
671adbec | 968 | /* initialize platform device stuff */ |
db350b08 SL |
969 | dock_station->dock_device = |
970 | platform_device_register_simple(dock_device_name, | |
971 | dock_station_count, NULL, 0); | |
972 | dock_device = dock_station->dock_device; | |
0f6f2804 | 973 | if (IS_ERR(dock_device)) { |
671adbec | 974 | kfree(dock_station); |
22fe4c21 | 975 | dock_station = NULL; |
0f6f2804 | 976 | return PTR_ERR(dock_device); |
671adbec | 977 | } |
db350b08 SL |
978 | platform_device_add_data(dock_device, &dock_station, |
979 | sizeof(struct dock_station *)); | |
a0cd35fd | 980 | |
9ef2a9a9 | 981 | /* we want the dock device to send uevents */ |
f67f129e | 982 | dev_set_uevent_suppress(&dock_device->dev, 0); |
9ef2a9a9 | 983 | |
db350b08 SL |
984 | if (is_dock(handle)) |
985 | dock_station->flags |= DOCK_IS_DOCK; | |
986 | if (is_ata(handle)) | |
987 | dock_station->flags |= DOCK_IS_ATA; | |
988 | if (is_battery(handle)) | |
989 | dock_station->flags |= DOCK_IS_BAT; | |
990 | ||
0f6f2804 | 991 | ret = device_create_file(&dock_device->dev, &dev_attr_docked); |
c80fdbe8 | 992 | if (ret) { |
4d939155 | 993 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 | 994 | platform_device_unregister(dock_device); |
c80fdbe8 | 995 | kfree(dock_station); |
22fe4c21 | 996 | dock_station = NULL; |
c80fdbe8 | 997 | return ret; |
998 | } | |
0f6f2804 | 999 | ret = device_create_file(&dock_device->dev, &dev_attr_undock); |
c80fdbe8 | 1000 | if (ret) { |
4d939155 | 1001 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 KCA |
1002 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1003 | platform_device_unregister(dock_device); | |
c80fdbe8 | 1004 | kfree(dock_station); |
22fe4c21 | 1005 | dock_station = NULL; |
c80fdbe8 | 1006 | return ret; |
1007 | } | |
0f6f2804 | 1008 | ret = device_create_file(&dock_device->dev, &dev_attr_uid); |
ac122bb6 | 1009 | if (ret) { |
4d939155 | 1010 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
0f6f2804 KCA |
1011 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1012 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1013 | platform_device_unregister(dock_device); | |
ac122bb6 | 1014 | kfree(dock_station); |
22fe4c21 | 1015 | dock_station = NULL; |
ac122bb6 IVE |
1016 | return ret; |
1017 | } | |
a0cd35fd KCA |
1018 | ret = device_create_file(&dock_device->dev, &dev_attr_flags); |
1019 | if (ret) { | |
4d939155 | 1020 | printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
a0cd35fd KCA |
1021 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1022 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1023 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
1024 | platform_device_unregister(dock_device); | |
1025 | kfree(dock_station); | |
1026 | dock_station = NULL; | |
1027 | return ret; | |
1028 | } | |
8652b00f SL |
1029 | ret = device_create_file(&dock_device->dev, &dev_attr_type); |
1030 | if (ret) | |
1031 | printk(KERN_ERR"Error %d adding sysfs file\n", ret); | |
671adbec | 1032 | |
c8f7a62c LB |
1033 | /* Find dependent devices */ |
1034 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1035 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
1036 | NULL); | |
1037 | ||
1038 | /* add the dock station as a device dependent on itself */ | |
1039 | dd = alloc_dock_dependent_device(handle); | |
1040 | if (!dd) { | |
1041 | kfree(dock_station); | |
22fe4c21 | 1042 | dock_station = NULL; |
671adbec KCA |
1043 | ret = -ENOMEM; |
1044 | goto dock_add_err_unregister; | |
c8f7a62c LB |
1045 | } |
1046 | add_dock_dependent_device(dock_station, dd); | |
1047 | ||
db350b08 SL |
1048 | dock_station_count++; |
1049 | list_add(&dock_station->sibiling, &dock_stations); | |
c8f7a62c LB |
1050 | return 0; |
1051 | ||
671adbec | 1052 | dock_add_err_unregister: |
8652b00f | 1053 | device_remove_file(&dock_device->dev, &dev_attr_type); |
0f6f2804 KCA |
1054 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1055 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1056 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1057 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1058 | platform_device_unregister(dock_device); |
671adbec | 1059 | kfree(dock_station); |
22fe4c21 | 1060 | dock_station = NULL; |
c8f7a62c LB |
1061 | return ret; |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * dock_remove - free up resources related to the dock station | |
1066 | */ | |
db350b08 | 1067 | static int dock_remove(struct dock_station *dock_station) |
c8f7a62c LB |
1068 | { |
1069 | struct dock_dependent_device *dd, *tmp; | |
db350b08 | 1070 | struct platform_device *dock_device = dock_station->dock_device; |
c8f7a62c | 1071 | |
db350b08 | 1072 | if (!dock_station_count) |
c8f7a62c LB |
1073 | return 0; |
1074 | ||
1075 | /* remove dependent devices */ | |
1076 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
1077 | list) | |
1078 | kfree(dd); | |
1079 | ||
671adbec | 1080 | /* cleanup sysfs */ |
8652b00f | 1081 | device_remove_file(&dock_device->dev, &dev_attr_type); |
0f6f2804 KCA |
1082 | device_remove_file(&dock_device->dev, &dev_attr_docked); |
1083 | device_remove_file(&dock_device->dev, &dev_attr_undock); | |
1084 | device_remove_file(&dock_device->dev, &dev_attr_uid); | |
a0cd35fd | 1085 | device_remove_file(&dock_device->dev, &dev_attr_flags); |
0f6f2804 | 1086 | platform_device_unregister(dock_device); |
671adbec | 1087 | |
c8f7a62c LB |
1088 | /* free dock station memory */ |
1089 | kfree(dock_station); | |
22fe4c21 | 1090 | dock_station = NULL; |
c8f7a62c LB |
1091 | return 0; |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * find_dock - look for a dock station | |
1096 | * @handle: acpi handle of a device | |
1097 | * @lvl: unused | |
1098 | * @context: counter of dock stations found | |
1099 | * @rv: unused | |
1100 | * | |
1101 | * This is called by acpi_walk_namespace to look for dock stations. | |
1102 | */ | |
1103 | static acpi_status | |
1104 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
1105 | { | |
c8f7a62c LB |
1106 | acpi_status status = AE_OK; |
1107 | ||
1108 | if (is_dock(handle)) { | |
1109 | if (dock_add(handle) >= 0) { | |
c8f7a62c LB |
1110 | status = AE_CTRL_TERMINATE; |
1111 | } | |
1112 | } | |
1113 | return status; | |
1114 | } | |
1115 | ||
db350b08 SL |
1116 | static acpi_status |
1117 | find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) | |
c8f7a62c | 1118 | { |
61b83695 SL |
1119 | /* If bay is a dock, it's already handled */ |
1120 | if (is_ejectable_bay(handle) && !is_dock(handle)) | |
db350b08 SL |
1121 | dock_add(handle); |
1122 | return AE_OK; | |
1123 | } | |
c8f7a62c | 1124 | |
db350b08 SL |
1125 | static int __init dock_init(void) |
1126 | { | |
816c2eda LB |
1127 | if (acpi_disabled) |
1128 | return 0; | |
1129 | ||
c8f7a62c LB |
1130 | /* look for a dock station */ |
1131 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
db350b08 | 1132 | ACPI_UINT32_MAX, find_dock, NULL, NULL); |
c8f7a62c | 1133 | |
db350b08 SL |
1134 | /* look for bay */ |
1135 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
1136 | ACPI_UINT32_MAX, find_bay, NULL, NULL); | |
1137 | if (!dock_station_count) { | |
1138 | printk(KERN_INFO PREFIX "No dock devices found.\n"); | |
1139 | return 0; | |
1140 | } | |
c8f7a62c | 1141 | |
6bd00a61 | 1142 | register_acpi_bus_notifier(&dock_acpi_notifier); |
db350b08 SL |
1143 | printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
1144 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); | |
c8f7a62c LB |
1145 | return 0; |
1146 | } | |
1147 | ||
1148 | static void __exit dock_exit(void) | |
1149 | { | |
db350b08 | 1150 | struct dock_station *dock_station; |
f2407298 | 1151 | struct dock_station *tmp; |
db350b08 | 1152 | |
6bd00a61 | 1153 | unregister_acpi_bus_notifier(&dock_acpi_notifier); |
f2407298 | 1154 | list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibiling) |
db350b08 | 1155 | dock_remove(dock_station); |
c8f7a62c LB |
1156 | } |
1157 | ||
db350b08 SL |
1158 | /* |
1159 | * Must be called before drivers of devices in dock, otherwise we can't know | |
1160 | * which devices are in a dock | |
1161 | */ | |
1162 | subsys_initcall(dock_init); | |
c8f7a62c | 1163 | module_exit(dock_exit); |