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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> |
cd73018f | 34 | #include <linux/acpi.h> |
c8f7a62c LB |
35 | #include <acpi/acpi_bus.h> |
36 | #include <acpi/acpi_drivers.h> | |
37 | ||
a192a958 LB |
38 | #define PREFIX "ACPI: " |
39 | ||
7cda93e0 | 40 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
c8f7a62c | 41 | |
f52fd66d | 42 | ACPI_MODULE_NAME("dock"); |
c8f7a62c | 43 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
7cda93e0 | 44 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
45 | MODULE_LICENSE("GPL"); |
46 | ||
90ab5ee9 | 47 | static bool immediate_undock = 1; |
a0cd35fd KCA |
48 | module_param(immediate_undock, bool, 0644); |
49 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " | |
50 | "undock immediately when the undock button is pressed, 0 will cause" | |
51 | " the driver to wait for userspace to write the undock sysfs file " | |
52 | " before undocking"); | |
53 | ||
c8f7a62c LB |
54 | static struct atomic_notifier_head dock_notifier_list; |
55 | ||
a340af14 FS |
56 | static const struct acpi_device_id dock_device_ids[] = { |
57 | {"LNXDOCK", 0}, | |
58 | {"", 0}, | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(acpi, dock_device_ids); | |
61 | ||
c8f7a62c LB |
62 | struct dock_station { |
63 | acpi_handle handle; | |
64 | unsigned long last_dock_time; | |
65 | u32 flags; | |
66 | spinlock_t dd_lock; | |
8b0dc866 | 67 | struct mutex hp_lock; |
c8f7a62c | 68 | struct list_head dependent_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; | |
21a31013 | 75 | static DEFINE_MUTEX(hotplug_lock); |
c8f7a62c LB |
76 | |
77 | struct dock_dependent_device { | |
78 | struct list_head list; | |
c8f7a62c | 79 | acpi_handle handle; |
21a31013 RW |
80 | const struct acpi_dock_ops *hp_ops; |
81 | void *hp_context; | |
82 | unsigned int hp_refcount; | |
83 | void (*hp_release)(void *); | |
c8f7a62c LB |
84 | }; |
85 | ||
86 | #define DOCK_DOCKING 0x00000001 | |
a0cd35fd | 87 | #define DOCK_UNDOCKING 0x00000002 |
db350b08 SL |
88 | #define DOCK_IS_DOCK 0x00000010 |
89 | #define DOCK_IS_ATA 0x00000020 | |
90 | #define DOCK_IS_BAT 0x00000040 | |
5669021e KCA |
91 | #define DOCK_EVENT 3 |
92 | #define UNDOCK_EVENT 2 | |
c8f7a62c | 93 | |
c8f7a62c LB |
94 | /***************************************************************************** |
95 | * Dock Dependent device functions * | |
96 | *****************************************************************************/ | |
97 | /** | |
f69cfdd2 AC |
98 | * add_dock_dependent_device - associate a device with the dock station |
99 | * @ds: The dock station | |
100 | * @handle: handle of the dependent device | |
c8f7a62c | 101 | * |
f69cfdd2 | 102 | * Add the dependent device to the dock's dependent device list. |
c8f7a62c | 103 | */ |
f69cfdd2 AC |
104 | static int |
105 | add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
c8f7a62c LB |
106 | { |
107 | struct dock_dependent_device *dd; | |
108 | ||
109 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
f69cfdd2 AC |
110 | if (!dd) |
111 | return -ENOMEM; | |
112 | ||
113 | dd->handle = handle; | |
114 | INIT_LIST_HEAD(&dd->list); | |
c8f7a62c | 115 | |
c8f7a62c LB |
116 | spin_lock(&ds->dd_lock); |
117 | list_add_tail(&dd->list, &ds->dependent_devices); | |
118 | spin_unlock(&ds->dd_lock); | |
f69cfdd2 AC |
119 | |
120 | return 0; | |
c8f7a62c LB |
121 | } |
122 | ||
123 | /** | |
21a31013 RW |
124 | * dock_init_hotplug - Initialize a hotplug device on a docking station. |
125 | * @dd: Dock-dependent device. | |
126 | * @ops: Dock operations to attach to the dependent device. | |
127 | * @context: Data to pass to the @ops callbacks and @release. | |
128 | * @init: Optional initialization routine to run after setting up context. | |
129 | * @release: Optional release routine to run on removal. | |
c8f7a62c | 130 | */ |
21a31013 RW |
131 | static int dock_init_hotplug(struct dock_dependent_device *dd, |
132 | const struct acpi_dock_ops *ops, void *context, | |
133 | void (*init)(void *), void (*release)(void *)) | |
c8f7a62c | 134 | { |
21a31013 RW |
135 | int ret = 0; |
136 | ||
137 | mutex_lock(&hotplug_lock); | |
138 | ||
139 | if (dd->hp_context) { | |
140 | ret = -EEXIST; | |
141 | } else { | |
142 | dd->hp_refcount = 1; | |
143 | dd->hp_ops = ops; | |
144 | dd->hp_context = context; | |
145 | dd->hp_release = release; | |
146 | } | |
147 | ||
148 | if (!WARN_ON(ret) && init) | |
149 | init(context); | |
150 | ||
151 | mutex_unlock(&hotplug_lock); | |
152 | return ret; | |
c8f7a62c LB |
153 | } |
154 | ||
155 | /** | |
21a31013 RW |
156 | * dock_release_hotplug - Decrement hotplug reference counter of dock device. |
157 | * @dd: Dock-dependent device. | |
c8f7a62c | 158 | * |
21a31013 RW |
159 | * Decrement the reference counter of @dd and if 0, detach its hotplug |
160 | * operations from it, reset its context pointer and run the optional release | |
161 | * routine if present. | |
c8f7a62c | 162 | */ |
21a31013 | 163 | static void dock_release_hotplug(struct dock_dependent_device *dd) |
c8f7a62c | 164 | { |
21a31013 RW |
165 | void (*release)(void *) = NULL; |
166 | void *context = NULL; | |
167 | ||
168 | mutex_lock(&hotplug_lock); | |
169 | ||
170 | if (dd->hp_context && !--dd->hp_refcount) { | |
171 | dd->hp_ops = NULL; | |
172 | context = dd->hp_context; | |
173 | dd->hp_context = NULL; | |
174 | release = dd->hp_release; | |
175 | dd->hp_release = NULL; | |
176 | } | |
177 | ||
178 | if (release && context) | |
179 | release(context); | |
180 | ||
181 | mutex_unlock(&hotplug_lock); | |
182 | } | |
183 | ||
184 | static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, | |
185 | bool uevent) | |
186 | { | |
187 | acpi_notify_handler cb = NULL; | |
188 | bool run = false; | |
189 | ||
190 | mutex_lock(&hotplug_lock); | |
191 | ||
192 | if (dd->hp_context) { | |
193 | run = true; | |
194 | dd->hp_refcount++; | |
195 | if (dd->hp_ops) | |
196 | cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler; | |
197 | } | |
198 | ||
199 | mutex_unlock(&hotplug_lock); | |
200 | ||
201 | if (!run) | |
202 | return; | |
203 | ||
204 | if (cb) | |
205 | cb(dd->handle, event, dd->hp_context); | |
206 | ||
207 | dock_release_hotplug(dd); | |
c8f7a62c LB |
208 | } |
209 | ||
210 | /** | |
211 | * find_dock_dependent_device - get a device dependent on this dock | |
212 | * @ds: the dock station | |
213 | * @handle: the acpi_handle of the device we want | |
214 | * | |
215 | * iterate over the dependent device list for this dock. If the | |
216 | * dependent device matches the handle, return. | |
217 | */ | |
218 | static struct dock_dependent_device * | |
219 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
220 | { | |
221 | struct dock_dependent_device *dd; | |
222 | ||
223 | spin_lock(&ds->dd_lock); | |
224 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
225 | if (handle == dd->handle) { | |
226 | spin_unlock(&ds->dd_lock); | |
227 | return dd; | |
228 | } | |
229 | } | |
230 | spin_unlock(&ds->dd_lock); | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | /***************************************************************************** | |
235 | * Dock functions * | |
236 | *****************************************************************************/ | |
237 | /** | |
238 | * is_dock - see if a device is a dock station | |
239 | * @handle: acpi handle of the device | |
240 | * | |
241 | * If an acpi object has a _DCK method, then it is by definition a dock | |
242 | * station, so return true. | |
243 | */ | |
244 | static int is_dock(acpi_handle handle) | |
245 | { | |
246 | acpi_status status; | |
247 | acpi_handle tmp; | |
248 | ||
249 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
250 | if (ACPI_FAILURE(status)) | |
251 | return 0; | |
252 | return 1; | |
253 | } | |
254 | ||
db350b08 SL |
255 | static int is_ejectable(acpi_handle handle) |
256 | { | |
257 | acpi_status status; | |
258 | acpi_handle tmp; | |
259 | ||
260 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
261 | if (ACPI_FAILURE(status)) | |
262 | return 0; | |
263 | return 1; | |
264 | } | |
265 | ||
266 | static int is_ata(acpi_handle handle) | |
267 | { | |
268 | acpi_handle tmp; | |
269 | ||
270 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || | |
271 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || | |
272 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || | |
273 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) | |
274 | return 1; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int is_battery(acpi_handle handle) | |
280 | { | |
281 | struct acpi_device_info *info; | |
db350b08 SL |
282 | int ret = 1; |
283 | ||
15b8dd53 | 284 | if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) |
db350b08 | 285 | return 0; |
db350b08 SL |
286 | if (!(info->valid & ACPI_VALID_HID)) |
287 | ret = 0; | |
288 | else | |
15b8dd53 | 289 | ret = !strcmp("PNP0C0A", info->hardware_id.string); |
db350b08 | 290 | |
15b8dd53 | 291 | kfree(info); |
db350b08 SL |
292 | return ret; |
293 | } | |
294 | ||
295 | static int is_ejectable_bay(acpi_handle handle) | |
296 | { | |
297 | acpi_handle phandle; | |
747479a3 | 298 | |
db350b08 SL |
299 | if (!is_ejectable(handle)) |
300 | return 0; | |
301 | if (is_battery(handle) || is_ata(handle)) | |
302 | return 1; | |
303 | if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) | |
304 | return 1; | |
305 | return 0; | |
306 | } | |
307 | ||
c8f7a62c LB |
308 | /** |
309 | * is_dock_device - see if a device is on a dock station | |
310 | * @handle: acpi handle of the device | |
311 | * | |
312 | * If this device is either the dock station itself, | |
313 | * or is a device dependent on the dock station, then it | |
314 | * is a dock device | |
315 | */ | |
316 | int is_dock_device(acpi_handle handle) | |
317 | { | |
db350b08 SL |
318 | struct dock_station *dock_station; |
319 | ||
320 | if (!dock_station_count) | |
c8f7a62c LB |
321 | return 0; |
322 | ||
db350b08 | 323 | if (is_dock(handle)) |
c8f7a62c | 324 | return 1; |
747479a3 AC |
325 | |
326 | list_for_each_entry(dock_station, &dock_stations, sibling) | |
db350b08 SL |
327 | if (find_dock_dependent_device(dock_station, handle)) |
328 | return 1; | |
c8f7a62c LB |
329 | |
330 | return 0; | |
331 | } | |
c8f7a62c LB |
332 | EXPORT_SYMBOL_GPL(is_dock_device); |
333 | ||
334 | /** | |
335 | * dock_present - see if the dock station is present. | |
336 | * @ds: the dock station | |
337 | * | |
338 | * execute the _STA method. note that present does not | |
339 | * imply that we are docked. | |
340 | */ | |
341 | static int dock_present(struct dock_station *ds) | |
342 | { | |
27663c58 | 343 | unsigned long long sta; |
c8f7a62c LB |
344 | acpi_status status; |
345 | ||
346 | if (ds) { | |
347 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
348 | if (ACPI_SUCCESS(status) && sta) | |
349 | return 1; | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
c8f7a62c LB |
354 | /** |
355 | * dock_create_acpi_device - add new devices to acpi | |
356 | * @handle - handle of the device to add | |
357 | * | |
358 | * This function will create a new acpi_device for the given | |
359 | * handle if one does not exist already. This should cause | |
360 | * acpi to scan for drivers for the given devices, and call | |
361 | * matching driver's add routine. | |
362 | * | |
363 | * Returns a pointer to the acpi_device corresponding to the handle. | |
364 | */ | |
365 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
366 | { | |
747479a3 | 367 | struct acpi_device *device; |
c8f7a62c LB |
368 | int ret; |
369 | ||
370 | if (acpi_bus_get_device(handle, &device)) { | |
371 | /* | |
372 | * no device created for this object, | |
373 | * so we should create one. | |
374 | */ | |
b8bd759a | 375 | ret = acpi_bus_scan(handle); |
636458de | 376 | if (ret) |
747479a3 | 377 | pr_debug("error adding bus, %x\n", -ret); |
0cd6ac52 RW |
378 | |
379 | acpi_bus_get_device(handle, &device); | |
c8f7a62c LB |
380 | } |
381 | return device; | |
382 | } | |
383 | ||
384 | /** | |
385 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
386 | * @handle - the handle of the device to remove | |
387 | * | |
388 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
389 | * driver to have it's remove routine called. | |
390 | */ | |
391 | static void dock_remove_acpi_device(acpi_handle handle) | |
392 | { | |
393 | struct acpi_device *device; | |
c8f7a62c | 394 | |
bfee26db RW |
395 | if (!acpi_bus_get_device(handle, &device)) |
396 | acpi_bus_trim(device); | |
c8f7a62c LB |
397 | } |
398 | ||
c8f7a62c LB |
399 | /** |
400 | * hotplug_dock_devices - insert or remove devices on the dock station | |
401 | * @ds: the dock station | |
402 | * @event: either bus check or eject request | |
403 | * | |
404 | * Some devices on the dock station need to have drivers called | |
405 | * to perform hotplug operations after a dock event has occurred. | |
406 | * Traverse the list of dock devices that have registered a | |
407 | * hotplug handler, and call the handler. | |
408 | */ | |
409 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
410 | { | |
411 | struct dock_dependent_device *dd; | |
412 | ||
8b0dc866 | 413 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
414 | |
415 | /* | |
416 | * First call driver specific hotplug functions | |
417 | */ | |
21a31013 RW |
418 | list_for_each_entry(dd, &ds->dependent_devices, list) |
419 | dock_hotplug_event(dd, event, false); | |
c8f7a62c LB |
420 | |
421 | /* | |
422 | * Now make sure that an acpi_device is created for each | |
423 | * dependent device, or removed if this is an eject request. | |
424 | * This will cause acpi_drivers to be stopped/started if they | |
425 | * exist | |
426 | */ | |
427 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
428 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
429 | dock_remove_acpi_device(dd->handle); | |
430 | else | |
431 | dock_create_acpi_device(dd->handle); | |
432 | } | |
8b0dc866 | 433 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
434 | } |
435 | ||
436 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
437 | { | |
db350b08 | 438 | struct device *dev = &ds->dock_device->dev; |
66b56821 | 439 | char event_string[13]; |
79a8f70b | 440 | char *envp[] = { event_string, NULL }; |
1253f7aa | 441 | struct dock_dependent_device *dd; |
79a8f70b KCA |
442 | |
443 | if (num == UNDOCK_EVENT) | |
66b56821 | 444 | sprintf(event_string, "EVENT=undock"); |
79a8f70b | 445 | else |
66b56821 | 446 | sprintf(event_string, "EVENT=dock"); |
79a8f70b | 447 | |
5669021e | 448 | /* |
8ea86e0b KCA |
449 | * Indicate that the status of the dock station has |
450 | * changed. | |
5669021e | 451 | */ |
1253f7aa SL |
452 | if (num == DOCK_EVENT) |
453 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
454 | ||
21a31013 RW |
455 | list_for_each_entry(dd, &ds->dependent_devices, list) |
456 | dock_hotplug_event(dd, event, true); | |
747479a3 | 457 | |
1253f7aa SL |
458 | if (num != DOCK_EVENT) |
459 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); | |
c8f7a62c LB |
460 | } |
461 | ||
462 | /** | |
463 | * eject_dock - respond to a dock eject request | |
464 | * @ds: the dock station | |
465 | * | |
466 | * This is called after _DCK is called, to execute the dock station's | |
467 | * _EJ0 method. | |
468 | */ | |
469 | static void eject_dock(struct dock_station *ds) | |
470 | { | |
471 | struct acpi_object_list arg_list; | |
472 | union acpi_object arg; | |
473 | acpi_status status; | |
474 | acpi_handle tmp; | |
475 | ||
476 | /* all dock devices should have _EJ0, but check anyway */ | |
477 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
478 | if (ACPI_FAILURE(status)) { | |
479 | pr_debug("No _EJ0 support for dock device\n"); | |
480 | return; | |
481 | } | |
482 | ||
483 | arg_list.count = 1; | |
484 | arg_list.pointer = &arg; | |
485 | arg.type = ACPI_TYPE_INTEGER; | |
486 | arg.integer.value = 1; | |
487 | ||
747479a3 AC |
488 | status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); |
489 | if (ACPI_FAILURE(status)) | |
c8f7a62c LB |
490 | pr_debug("Failed to evaluate _EJ0!\n"); |
491 | } | |
492 | ||
493 | /** | |
494 | * handle_dock - handle a dock event | |
495 | * @ds: the dock station | |
496 | * @dock: to dock, or undock - that is the question | |
497 | * | |
498 | * Execute the _DCK method in response to an acpi event | |
499 | */ | |
500 | static void handle_dock(struct dock_station *ds, int dock) | |
501 | { | |
502 | acpi_status status; | |
503 | struct acpi_object_list arg_list; | |
504 | union acpi_object arg; | |
505 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
c8f7a62c | 506 | |
cd73018f | 507 | acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking"); |
c8f7a62c LB |
508 | |
509 | /* _DCK method has one argument */ | |
510 | arg_list.count = 1; | |
511 | arg_list.pointer = &arg; | |
512 | arg.type = ACPI_TYPE_INTEGER; | |
513 | arg.integer.value = dock; | |
514 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
db350b08 | 515 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
cd73018f TK |
516 | acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n", |
517 | status); | |
0a918a94 | 518 | |
c8f7a62c | 519 | kfree(buffer.pointer); |
c8f7a62c LB |
520 | } |
521 | ||
522 | static inline void dock(struct dock_station *ds) | |
523 | { | |
524 | handle_dock(ds, 1); | |
525 | } | |
526 | ||
527 | static inline void undock(struct dock_station *ds) | |
528 | { | |
529 | handle_dock(ds, 0); | |
530 | } | |
531 | ||
532 | static inline void begin_dock(struct dock_station *ds) | |
533 | { | |
534 | ds->flags |= DOCK_DOCKING; | |
535 | } | |
536 | ||
537 | static inline void complete_dock(struct dock_station *ds) | |
538 | { | |
539 | ds->flags &= ~(DOCK_DOCKING); | |
540 | ds->last_dock_time = jiffies; | |
541 | } | |
542 | ||
a0cd35fd KCA |
543 | static inline void begin_undock(struct dock_station *ds) |
544 | { | |
545 | ds->flags |= DOCK_UNDOCKING; | |
546 | } | |
547 | ||
548 | static inline void complete_undock(struct dock_station *ds) | |
549 | { | |
550 | ds->flags &= ~(DOCK_UNDOCKING); | |
551 | } | |
552 | ||
406f692d SL |
553 | static void dock_lock(struct dock_station *ds, int lock) |
554 | { | |
555 | struct acpi_object_list arg_list; | |
556 | union acpi_object arg; | |
557 | acpi_status status; | |
558 | ||
559 | arg_list.count = 1; | |
560 | arg_list.pointer = &arg; | |
561 | arg.type = ACPI_TYPE_INTEGER; | |
562 | arg.integer.value = !!lock; | |
563 | status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); | |
564 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
565 | if (lock) | |
cd73018f TK |
566 | acpi_handle_warn(ds->handle, |
567 | "Locking device failed (0x%x)\n", status); | |
406f692d | 568 | else |
cd73018f TK |
569 | acpi_handle_warn(ds->handle, |
570 | "Unlocking device failed (0x%x)\n", status); | |
406f692d SL |
571 | } |
572 | } | |
573 | ||
c8f7a62c LB |
574 | /** |
575 | * dock_in_progress - see if we are in the middle of handling a dock event | |
576 | * @ds: the dock station | |
577 | * | |
578 | * Sometimes while docking, false dock events can be sent to the driver | |
579 | * because good connections aren't made or some other reason. Ignore these | |
580 | * if we are in the middle of doing something. | |
581 | */ | |
582 | static int dock_in_progress(struct dock_station *ds) | |
583 | { | |
584 | if ((ds->flags & DOCK_DOCKING) || | |
585 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
586 | return 1; | |
587 | return 0; | |
588 | } | |
589 | ||
590 | /** | |
591 | * register_dock_notifier - add yourself to the dock notifier list | |
592 | * @nb: the callers notifier block | |
593 | * | |
594 | * If a driver wishes to be notified about dock events, they can | |
595 | * use this function to put a notifier block on the dock notifier list. | |
596 | * this notifier call chain will be called after a dock event, but | |
597 | * before hotplugging any new devices. | |
598 | */ | |
599 | int register_dock_notifier(struct notifier_block *nb) | |
600 | { | |
db350b08 | 601 | if (!dock_station_count) |
2548c06b PB |
602 | return -ENODEV; |
603 | ||
c8f7a62c LB |
604 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
605 | } | |
c8f7a62c LB |
606 | EXPORT_SYMBOL_GPL(register_dock_notifier); |
607 | ||
608 | /** | |
609 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
610 | * @nb: the callers notifier block | |
611 | */ | |
612 | void unregister_dock_notifier(struct notifier_block *nb) | |
613 | { | |
db350b08 | 614 | if (!dock_station_count) |
2548c06b PB |
615 | return; |
616 | ||
c8f7a62c LB |
617 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
618 | } | |
c8f7a62c LB |
619 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); |
620 | ||
621 | /** | |
622 | * register_hotplug_dock_device - register a hotplug function | |
623 | * @handle: the handle of the device | |
1253f7aa | 624 | * @ops: handlers to call after docking |
c8f7a62c | 625 | * @context: device specific data |
21a31013 RW |
626 | * @init: Optional initialization routine to run after registration |
627 | * @release: Optional release routine to run on unregistration | |
c8f7a62c LB |
628 | * |
629 | * If a driver would like to perform a hotplug operation after a dock | |
630 | * event, they can register an acpi_notifiy_handler to be called by | |
631 | * the dock driver after _DCK is executed. | |
632 | */ | |
21a31013 RW |
633 | int register_hotplug_dock_device(acpi_handle handle, |
634 | const struct acpi_dock_ops *ops, void *context, | |
635 | void (*init)(void *), void (*release)(void *)) | |
c8f7a62c LB |
636 | { |
637 | struct dock_dependent_device *dd; | |
db350b08 | 638 | struct dock_station *dock_station; |
61b83695 | 639 | int ret = -EINVAL; |
c8f7a62c | 640 | |
21a31013 RW |
641 | if (WARN_ON(!context)) |
642 | return -EINVAL; | |
643 | ||
db350b08 | 644 | if (!dock_station_count) |
c8f7a62c LB |
645 | return -ENODEV; |
646 | ||
647 | /* | |
648 | * make sure this handle is for a device dependent on the dock, | |
649 | * this would include the dock station itself | |
650 | */ | |
50d716e4 | 651 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
61b83695 SL |
652 | /* |
653 | * An ATA bay can be in a dock and itself can be ejected | |
3ad2f3fb | 654 | * separately, so there are two 'dock stations' which need the |
61b83695 SL |
655 | * ops |
656 | */ | |
db350b08 | 657 | dd = find_dock_dependent_device(dock_station, handle); |
21a31013 | 658 | if (dd && !dock_init_hotplug(dd, ops, context, init, release)) |
61b83695 | 659 | ret = 0; |
c8f7a62c LB |
660 | } |
661 | ||
61b83695 | 662 | return ret; |
c8f7a62c | 663 | } |
c8f7a62c LB |
664 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); |
665 | ||
666 | /** | |
667 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
668 | * @handle: the acpi handle of the device | |
669 | */ | |
670 | void unregister_hotplug_dock_device(acpi_handle handle) | |
671 | { | |
672 | struct dock_dependent_device *dd; | |
db350b08 | 673 | struct dock_station *dock_station; |
c8f7a62c | 674 | |
db350b08 | 675 | if (!dock_station_count) |
c8f7a62c LB |
676 | return; |
677 | ||
50d716e4 | 678 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
db350b08 SL |
679 | dd = find_dock_dependent_device(dock_station, handle); |
680 | if (dd) | |
21a31013 | 681 | dock_release_hotplug(dd); |
db350b08 | 682 | } |
c8f7a62c | 683 | } |
c8f7a62c LB |
684 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); |
685 | ||
c80fdbe8 | 686 | /** |
687 | * handle_eject_request - handle an undock request checking for error conditions | |
688 | * | |
689 | * Check to make sure the dock device is still present, then undock and | |
690 | * hotremove all the devices that may need removing. | |
691 | */ | |
692 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
693 | { | |
c80fdbe8 | 694 | if (dock_in_progress(ds)) |
695 | return -EBUSY; | |
696 | ||
697 | /* | |
698 | * here we need to generate the undock | |
699 | * event prior to actually doing the undock | |
700 | * so that the device struct still exists. | |
afd7301d HM |
701 | * Also, even send the dock event if the |
702 | * device is not present anymore | |
c80fdbe8 | 703 | */ |
704 | dock_event(ds, event, UNDOCK_EVENT); | |
afd7301d | 705 | |
c80fdbe8 | 706 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
707 | undock(ds); | |
406f692d | 708 | dock_lock(ds, 0); |
c80fdbe8 | 709 | eject_dock(ds); |
710 | if (dock_present(ds)) { | |
cd73018f | 711 | acpi_handle_err(ds->handle, "Unable to undock!\n"); |
c80fdbe8 | 712 | return -EBUSY; |
713 | } | |
a0cd35fd | 714 | complete_undock(ds); |
c80fdbe8 | 715 | return 0; |
716 | } | |
717 | ||
c8f7a62c LB |
718 | /** |
719 | * dock_notify - act upon an acpi dock notification | |
720 | * @handle: the dock station handle | |
721 | * @event: the acpi event | |
722 | * @data: our driver data struct | |
723 | * | |
724 | * If we are notified to dock, then check to see if the dock is | |
725 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 726 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
727 | */ |
728 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
729 | { | |
50dd0969 | 730 | struct dock_station *ds = data; |
8b59560a | 731 | struct acpi_device *tmp; |
db350b08 | 732 | int surprise_removal = 0; |
c8f7a62c | 733 | |
db350b08 SL |
734 | /* |
735 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
736 | * is sent and _DCK is present, it is assumed to mean an undock | |
737 | * request. | |
738 | */ | |
739 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) | |
740 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
741 | ||
742 | /* | |
743 | * dock station: BUS_CHECK - docked or surprise removal | |
744 | * DEVICE_CHECK - undocked | |
745 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal | |
746 | * | |
747 | * To simplify event handling, dock dependent device handler always | |
748 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and | |
749 | * ACPI_NOTIFY_EJECT_REQUEST for removal | |
750 | */ | |
c8f7a62c LB |
751 | switch (event) { |
752 | case ACPI_NOTIFY_BUS_CHECK: | |
db350b08 | 753 | case ACPI_NOTIFY_DEVICE_CHECK: |
8b59560a SL |
754 | if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
755 | &tmp)) { | |
c8f7a62c LB |
756 | begin_dock(ds); |
757 | dock(ds); | |
758 | if (!dock_present(ds)) { | |
cd73018f | 759 | acpi_handle_err(handle, "Unable to dock!\n"); |
8b59560a | 760 | complete_dock(ds); |
c8f7a62c LB |
761 | break; |
762 | } | |
763 | atomic_notifier_call_chain(&dock_notifier_list, | |
764 | event, NULL); | |
765 | hotplug_dock_devices(ds, event); | |
766 | complete_dock(ds); | |
767 | dock_event(ds, event, DOCK_EVENT); | |
406f692d | 768 | dock_lock(ds, 1); |
3a37898d | 769 | acpi_update_all_gpes(); |
db350b08 | 770 | break; |
c8f7a62c | 771 | } |
db350b08 SL |
772 | if (dock_present(ds) || dock_in_progress(ds)) |
773 | break; | |
774 | /* This is a surprise removal */ | |
775 | surprise_removal = 1; | |
776 | event = ACPI_NOTIFY_EJECT_REQUEST; | |
777 | /* Fall back */ | |
c8f7a62c | 778 | case ACPI_NOTIFY_EJECT_REQUEST: |
a0cd35fd | 779 | begin_undock(ds); |
f730ae18 SL |
780 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
781 | || surprise_removal) | |
a0cd35fd KCA |
782 | handle_eject_request(ds, event); |
783 | else | |
784 | dock_event(ds, event, UNDOCK_EVENT); | |
c8f7a62c LB |
785 | break; |
786 | default: | |
cd73018f | 787 | acpi_handle_err(handle, "Unknown dock event %d\n", event); |
c8f7a62c LB |
788 | } |
789 | } | |
790 | ||
19cd847a ZR |
791 | struct dock_data { |
792 | acpi_handle handle; | |
793 | unsigned long event; | |
794 | struct dock_station *ds; | |
795 | }; | |
796 | ||
797 | static void acpi_dock_deferred_cb(void *context) | |
798 | { | |
747479a3 | 799 | struct dock_data *data = context; |
19cd847a | 800 | |
3757b948 | 801 | acpi_scan_lock_acquire(); |
19cd847a | 802 | dock_notify(data->handle, data->event, data->ds); |
3757b948 | 803 | acpi_scan_lock_release(); |
19cd847a ZR |
804 | kfree(data); |
805 | } | |
806 | ||
6bd00a61 SL |
807 | static int acpi_dock_notifier_call(struct notifier_block *this, |
808 | unsigned long event, void *data) | |
809 | { | |
810 | struct dock_station *dock_station; | |
747479a3 | 811 | acpi_handle handle = data; |
6bd00a61 SL |
812 | |
813 | if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK | |
814 | && event != ACPI_NOTIFY_EJECT_REQUEST) | |
815 | return 0; | |
3757b948 RW |
816 | |
817 | acpi_scan_lock_acquire(); | |
818 | ||
50d716e4 | 819 | list_for_each_entry(dock_station, &dock_stations, sibling) { |
6bd00a61 | 820 | if (dock_station->handle == handle) { |
747479a3 | 821 | struct dock_data *dd; |
3757b948 | 822 | acpi_status status; |
19cd847a | 823 | |
747479a3 AC |
824 | dd = kmalloc(sizeof(*dd), GFP_KERNEL); |
825 | if (!dd) | |
3757b948 RW |
826 | break; |
827 | ||
747479a3 AC |
828 | dd->handle = handle; |
829 | dd->event = event; | |
830 | dd->ds = dock_station; | |
3757b948 RW |
831 | status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, |
832 | dd); | |
833 | if (ACPI_FAILURE(status)) | |
834 | kfree(dd); | |
835 | ||
836 | break; | |
6bd00a61 SL |
837 | } |
838 | } | |
3757b948 RW |
839 | |
840 | acpi_scan_lock_release(); | |
6bd00a61 SL |
841 | return 0; |
842 | } | |
843 | ||
844 | static struct notifier_block dock_acpi_notifier = { | |
845 | .notifier_call = acpi_dock_notifier_call, | |
846 | }; | |
847 | ||
c8f7a62c LB |
848 | /** |
849 | * find_dock_devices - find devices on the dock station | |
850 | * @handle: the handle of the device we are examining | |
851 | * @lvl: unused | |
852 | * @context: the dock station private data | |
853 | * @rv: unused | |
854 | * | |
855 | * This function is called by acpi_walk_namespace. It will | |
856 | * check to see if an object has an _EJD method. If it does, then it | |
857 | * will see if it is dependent on the dock station. | |
858 | */ | |
859 | static acpi_status | |
860 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
861 | { | |
862 | acpi_status status; | |
fe9a2f77 | 863 | acpi_handle tmp, parent; |
50dd0969 | 864 | struct dock_station *ds = context; |
c8f7a62c LB |
865 | |
866 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
867 | if (ACPI_FAILURE(status)) { |
868 | /* try the parent device as well */ | |
869 | status = acpi_get_parent(handle, &parent); | |
870 | if (ACPI_FAILURE(status)) | |
871 | goto fdd_out; | |
872 | /* see if parent is dependent on dock */ | |
873 | status = acpi_bus_get_ejd(parent, &tmp); | |
874 | if (ACPI_FAILURE(status)) | |
875 | goto fdd_out; | |
876 | } | |
c8f7a62c | 877 | |
f69cfdd2 AC |
878 | if (tmp == ds->handle) |
879 | add_dock_dependent_device(ds, handle); | |
880 | ||
fe9a2f77 | 881 | fdd_out: |
c8f7a62c LB |
882 | return AE_OK; |
883 | } | |
884 | ||
c80fdbe8 | 885 | /* |
886 | * show_docked - read method for "docked" file in sysfs | |
887 | */ | |
888 | static ssize_t show_docked(struct device *dev, | |
889 | struct device_attribute *attr, char *buf) | |
890 | { | |
fc5a9f88 HM |
891 | struct acpi_device *tmp; |
892 | ||
fe06fba2 | 893 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 894 | |
02df7349 | 895 | if (!acpi_bus_get_device(dock_station->handle, &tmp)) |
fc5a9f88 HM |
896 | return snprintf(buf, PAGE_SIZE, "1\n"); |
897 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
c80fdbe8 | 898 | } |
e5685b9d | 899 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
c80fdbe8 | 900 | |
a0cd35fd KCA |
901 | /* |
902 | * show_flags - read method for flags file in sysfs | |
903 | */ | |
904 | static ssize_t show_flags(struct device *dev, | |
905 | struct device_attribute *attr, char *buf) | |
906 | { | |
fe06fba2 | 907 | struct dock_station *dock_station = dev->platform_data; |
a0cd35fd KCA |
908 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
909 | ||
910 | } | |
e5685b9d | 911 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
a0cd35fd | 912 | |
c80fdbe8 | 913 | /* |
914 | * write_undock - write method for "undock" file in sysfs | |
915 | */ | |
916 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
917 | const char *buf, size_t count) | |
918 | { | |
919 | int ret; | |
fe06fba2 | 920 | struct dock_station *dock_station = dev->platform_data; |
c80fdbe8 | 921 | |
922 | if (!count) | |
923 | return -EINVAL; | |
924 | ||
8112006f | 925 | acpi_scan_lock_acquire(); |
9171f834 | 926 | begin_undock(dock_station); |
c80fdbe8 | 927 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
8112006f | 928 | acpi_scan_lock_release(); |
c80fdbe8 | 929 | return ret ? ret: count; |
930 | } | |
e5685b9d | 931 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
c80fdbe8 | 932 | |
ac122bb6 IVE |
933 | /* |
934 | * show_dock_uid - read method for "uid" file in sysfs | |
935 | */ | |
936 | static ssize_t show_dock_uid(struct device *dev, | |
937 | struct device_attribute *attr, char *buf) | |
938 | { | |
27663c58 | 939 | unsigned long long lbuf; |
fe06fba2 | 940 | struct dock_station *dock_station = dev->platform_data; |
38ff4ffc KCA |
941 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
942 | "_UID", NULL, &lbuf); | |
943 | if (ACPI_FAILURE(status)) | |
ac122bb6 | 944 | return 0; |
38ff4ffc | 945 | |
27663c58 | 946 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
ac122bb6 | 947 | } |
e5685b9d | 948 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
ac122bb6 | 949 | |
8652b00f SL |
950 | static ssize_t show_dock_type(struct device *dev, |
951 | struct device_attribute *attr, char *buf) | |
952 | { | |
fe06fba2 | 953 | struct dock_station *dock_station = dev->platform_data; |
8652b00f SL |
954 | char *type; |
955 | ||
956 | if (dock_station->flags & DOCK_IS_DOCK) | |
957 | type = "dock_station"; | |
958 | else if (dock_station->flags & DOCK_IS_ATA) | |
959 | type = "ata_bay"; | |
960 | else if (dock_station->flags & DOCK_IS_BAT) | |
961 | type = "battery_bay"; | |
962 | else | |
963 | type = "unknown"; | |
964 | ||
965 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
966 | } | |
967 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); | |
968 | ||
5f46c2f2 AC |
969 | static struct attribute *dock_attributes[] = { |
970 | &dev_attr_docked.attr, | |
971 | &dev_attr_flags.attr, | |
972 | &dev_attr_undock.attr, | |
973 | &dev_attr_uid.attr, | |
974 | &dev_attr_type.attr, | |
975 | NULL | |
976 | }; | |
977 | ||
978 | static struct attribute_group dock_attribute_group = { | |
979 | .attrs = dock_attributes | |
980 | }; | |
981 | ||
c8f7a62c LB |
982 | /** |
983 | * dock_add - add a new dock station | |
984 | * @handle: the dock station handle | |
985 | * | |
986 | * allocated and initialize a new dock station device. Find all devices | |
987 | * that are on the dock station, and register for dock event notifications. | |
988 | */ | |
d38a5edf | 989 | static int __init dock_add(acpi_handle handle) |
c8f7a62c | 990 | { |
fe06fba2 AC |
991 | int ret, id; |
992 | struct dock_station ds, *dock_station; | |
747479a3 | 993 | struct platform_device *dd; |
c8f7a62c | 994 | |
fe06fba2 | 995 | id = dock_station_count; |
49c6fb2e | 996 | memset(&ds, 0, sizeof(ds)); |
747479a3 AC |
997 | dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); |
998 | if (IS_ERR(dd)) | |
999 | return PTR_ERR(dd); | |
1000 | ||
1001 | dock_station = dd->dev.platform_data; | |
c8f7a62c | 1002 | |
c8f7a62c | 1003 | dock_station->handle = handle; |
747479a3 | 1004 | dock_station->dock_device = dd; |
c8f7a62c | 1005 | dock_station->last_dock_time = jiffies - HZ; |
747479a3 | 1006 | |
8b0dc866 | 1007 | mutex_init(&dock_station->hp_lock); |
747479a3 AC |
1008 | spin_lock_init(&dock_station->dd_lock); |
1009 | INIT_LIST_HEAD(&dock_station->sibling); | |
747479a3 | 1010 | INIT_LIST_HEAD(&dock_station->dependent_devices); |
a0cd35fd | 1011 | |
9ef2a9a9 | 1012 | /* we want the dock device to send uevents */ |
747479a3 | 1013 | dev_set_uevent_suppress(&dd->dev, 0); |
9ef2a9a9 | 1014 | |
db350b08 SL |
1015 | if (is_dock(handle)) |
1016 | dock_station->flags |= DOCK_IS_DOCK; | |
1017 | if (is_ata(handle)) | |
1018 | dock_station->flags |= DOCK_IS_ATA; | |
1019 | if (is_battery(handle)) | |
1020 | dock_station->flags |= DOCK_IS_BAT; | |
1021 | ||
747479a3 | 1022 | ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); |
8652b00f | 1023 | if (ret) |
5f46c2f2 | 1024 | goto err_unregister; |
671adbec | 1025 | |
c8f7a62c LB |
1026 | /* Find dependent devices */ |
1027 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
2263576c LM |
1028 | ACPI_UINT32_MAX, find_dock_devices, NULL, |
1029 | dock_station, NULL); | |
c8f7a62c LB |
1030 | |
1031 | /* add the dock station as a device dependent on itself */ | |
f69cfdd2 AC |
1032 | ret = add_dock_dependent_device(dock_station, handle); |
1033 | if (ret) | |
5f46c2f2 | 1034 | goto err_rmgroup; |
c8f7a62c | 1035 | |
db350b08 | 1036 | dock_station_count++; |
50d716e4 | 1037 | list_add(&dock_station->sibling, &dock_stations); |
c8f7a62c LB |
1038 | return 0; |
1039 | ||
5f46c2f2 | 1040 | err_rmgroup: |
747479a3 | 1041 | sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); |
5f46c2f2 | 1042 | err_unregister: |
747479a3 | 1043 | platform_device_unregister(dd); |
cd73018f | 1044 | acpi_handle_err(handle, "%s encountered error %d\n", __func__, ret); |
c8f7a62c LB |
1045 | return ret; |
1046 | } | |
1047 | ||
c8f7a62c | 1048 | /** |
8ab0ab25 | 1049 | * find_dock_and_bay - look for dock stations and bays |
c8f7a62c LB |
1050 | * @handle: acpi handle of a device |
1051 | * @lvl: unused | |
8ab0ab25 | 1052 | * @context: unused |
c8f7a62c LB |
1053 | * @rv: unused |
1054 | * | |
8ab0ab25 | 1055 | * This is called by acpi_walk_namespace to look for dock stations and bays. |
c8f7a62c | 1056 | */ |
d38a5edf | 1057 | static __init acpi_status |
8ab0ab25 | 1058 | find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv) |
c8f7a62c | 1059 | { |
8ab0ab25 | 1060 | if (is_dock(handle) || is_ejectable_bay(handle)) |
1ee4d61f | 1061 | dock_add(handle); |
747479a3 | 1062 | |
1ee4d61f | 1063 | return AE_OK; |
c8f7a62c LB |
1064 | } |
1065 | ||
2ce65fe8 | 1066 | void __init acpi_dock_init(void) |
db350b08 | 1067 | { |
816c2eda | 1068 | if (acpi_disabled) |
2ce65fe8 | 1069 | return; |
816c2eda | 1070 | |
8ab0ab25 | 1071 | /* look for dock stations and bays */ |
c8f7a62c | 1072 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
8ab0ab25 | 1073 | ACPI_UINT32_MAX, find_dock_and_bay, NULL, NULL, NULL); |
c8f7a62c | 1074 | |
db350b08 | 1075 | if (!dock_station_count) { |
cd73018f | 1076 | pr_info(PREFIX "No dock devices found.\n"); |
2ce65fe8 | 1077 | return; |
db350b08 | 1078 | } |
c8f7a62c | 1079 | |
f22ff552 | 1080 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
6bd00a61 | 1081 | register_acpi_bus_notifier(&dock_acpi_notifier); |
cd73018f | 1082 | pr_info(PREFIX "%s: %d docks/bays found\n", |
db350b08 | 1083 | ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); |
c8f7a62c | 1084 | } |