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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 | ||
43 | static struct atomic_notifier_head dock_notifier_list; | |
671adbec KCA |
44 | static struct platform_device dock_device; |
45 | static char dock_device_name[] = "dock"; | |
c8f7a62c LB |
46 | |
47 | struct dock_station { | |
48 | acpi_handle handle; | |
49 | unsigned long last_dock_time; | |
50 | u32 flags; | |
51 | spinlock_t dd_lock; | |
8b0dc866 | 52 | struct mutex hp_lock; |
c8f7a62c LB |
53 | struct list_head dependent_devices; |
54 | struct list_head hotplug_devices; | |
55 | }; | |
56 | ||
57 | struct dock_dependent_device { | |
58 | struct list_head list; | |
59 | struct list_head hotplug_list; | |
60 | acpi_handle handle; | |
61 | acpi_notify_handler handler; | |
62 | void *context; | |
63 | }; | |
64 | ||
65 | #define DOCK_DOCKING 0x00000001 | |
5669021e KCA |
66 | #define DOCK_EVENT 3 |
67 | #define UNDOCK_EVENT 2 | |
c8f7a62c LB |
68 | |
69 | static struct dock_station *dock_station; | |
70 | ||
71 | /***************************************************************************** | |
72 | * Dock Dependent device functions * | |
73 | *****************************************************************************/ | |
74 | /** | |
75 | * alloc_dock_dependent_device - allocate and init a dependent device | |
76 | * @handle: the acpi_handle of the dependent device | |
77 | * | |
78 | * Allocate memory for a dependent device structure for a device referenced | |
79 | * by the acpi handle | |
80 | */ | |
81 | static struct dock_dependent_device * | |
82 | alloc_dock_dependent_device(acpi_handle handle) | |
83 | { | |
84 | struct dock_dependent_device *dd; | |
85 | ||
86 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); | |
87 | if (dd) { | |
88 | dd->handle = handle; | |
89 | INIT_LIST_HEAD(&dd->list); | |
90 | INIT_LIST_HEAD(&dd->hotplug_list); | |
91 | } | |
92 | return dd; | |
93 | } | |
94 | ||
95 | /** | |
96 | * add_dock_dependent_device - associate a device with the dock station | |
97 | * @ds: The dock station | |
98 | * @dd: The dependent device | |
99 | * | |
100 | * Add the dependent device to the dock's dependent device list. | |
101 | */ | |
102 | static void | |
103 | add_dock_dependent_device(struct dock_station *ds, | |
104 | struct dock_dependent_device *dd) | |
105 | { | |
106 | spin_lock(&ds->dd_lock); | |
107 | list_add_tail(&dd->list, &ds->dependent_devices); | |
108 | spin_unlock(&ds->dd_lock); | |
109 | } | |
110 | ||
111 | /** | |
112 | * dock_add_hotplug_device - associate a hotplug handler with the dock station | |
113 | * @ds: The dock station | |
114 | * @dd: The dependent device struct | |
115 | * | |
116 | * Add the dependent device to the dock's hotplug device list | |
117 | */ | |
118 | static void | |
119 | dock_add_hotplug_device(struct dock_station *ds, | |
120 | struct dock_dependent_device *dd) | |
121 | { | |
8b0dc866 | 122 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 123 | list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
8b0dc866 | 124 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
125 | } |
126 | ||
127 | /** | |
128 | * dock_del_hotplug_device - remove a hotplug handler from the dock station | |
129 | * @ds: The dock station | |
130 | * @dd: the dependent device struct | |
131 | * | |
132 | * Delete the dependent device from the dock's hotplug device list | |
133 | */ | |
134 | static void | |
135 | dock_del_hotplug_device(struct dock_station *ds, | |
136 | struct dock_dependent_device *dd) | |
137 | { | |
8b0dc866 | 138 | mutex_lock(&ds->hp_lock); |
c8f7a62c | 139 | list_del(&dd->hotplug_list); |
8b0dc866 | 140 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
141 | } |
142 | ||
143 | /** | |
144 | * find_dock_dependent_device - get a device dependent on this dock | |
145 | * @ds: the dock station | |
146 | * @handle: the acpi_handle of the device we want | |
147 | * | |
148 | * iterate over the dependent device list for this dock. If the | |
149 | * dependent device matches the handle, return. | |
150 | */ | |
151 | static struct dock_dependent_device * | |
152 | find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) | |
153 | { | |
154 | struct dock_dependent_device *dd; | |
155 | ||
156 | spin_lock(&ds->dd_lock); | |
157 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
158 | if (handle == dd->handle) { | |
159 | spin_unlock(&ds->dd_lock); | |
160 | return dd; | |
161 | } | |
162 | } | |
163 | spin_unlock(&ds->dd_lock); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /***************************************************************************** | |
168 | * Dock functions * | |
169 | *****************************************************************************/ | |
170 | /** | |
171 | * is_dock - see if a device is a dock station | |
172 | * @handle: acpi handle of the device | |
173 | * | |
174 | * If an acpi object has a _DCK method, then it is by definition a dock | |
175 | * station, so return true. | |
176 | */ | |
177 | static int is_dock(acpi_handle handle) | |
178 | { | |
179 | acpi_status status; | |
180 | acpi_handle tmp; | |
181 | ||
182 | status = acpi_get_handle(handle, "_DCK", &tmp); | |
183 | if (ACPI_FAILURE(status)) | |
184 | return 0; | |
185 | return 1; | |
186 | } | |
187 | ||
188 | /** | |
189 | * is_dock_device - see if a device is on a dock station | |
190 | * @handle: acpi handle of the device | |
191 | * | |
192 | * If this device is either the dock station itself, | |
193 | * or is a device dependent on the dock station, then it | |
194 | * is a dock device | |
195 | */ | |
196 | int is_dock_device(acpi_handle handle) | |
197 | { | |
198 | if (!dock_station) | |
199 | return 0; | |
200 | ||
201 | if (is_dock(handle) || find_dock_dependent_device(dock_station, handle)) | |
202 | return 1; | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | EXPORT_SYMBOL_GPL(is_dock_device); | |
208 | ||
209 | /** | |
210 | * dock_present - see if the dock station is present. | |
211 | * @ds: the dock station | |
212 | * | |
213 | * execute the _STA method. note that present does not | |
214 | * imply that we are docked. | |
215 | */ | |
216 | static int dock_present(struct dock_station *ds) | |
217 | { | |
218 | unsigned long sta; | |
219 | acpi_status status; | |
220 | ||
221 | if (ds) { | |
222 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); | |
223 | if (ACPI_SUCCESS(status) && sta) | |
224 | return 1; | |
225 | } | |
226 | return 0; | |
227 | } | |
228 | ||
229 | ||
230 | ||
231 | /** | |
232 | * dock_create_acpi_device - add new devices to acpi | |
233 | * @handle - handle of the device to add | |
234 | * | |
235 | * This function will create a new acpi_device for the given | |
236 | * handle if one does not exist already. This should cause | |
237 | * acpi to scan for drivers for the given devices, and call | |
238 | * matching driver's add routine. | |
239 | * | |
240 | * Returns a pointer to the acpi_device corresponding to the handle. | |
241 | */ | |
242 | static struct acpi_device * dock_create_acpi_device(acpi_handle handle) | |
243 | { | |
244 | struct acpi_device *device = NULL; | |
245 | struct acpi_device *parent_device; | |
246 | acpi_handle parent; | |
247 | int ret; | |
248 | ||
249 | if (acpi_bus_get_device(handle, &device)) { | |
250 | /* | |
251 | * no device created for this object, | |
252 | * so we should create one. | |
253 | */ | |
254 | acpi_get_parent(handle, &parent); | |
255 | if (acpi_bus_get_device(parent, &parent_device)) | |
256 | parent_device = NULL; | |
257 | ||
258 | ret = acpi_bus_add(&device, parent_device, handle, | |
259 | ACPI_BUS_TYPE_DEVICE); | |
260 | if (ret) { | |
261 | pr_debug("error adding bus, %x\n", | |
262 | -ret); | |
263 | return NULL; | |
264 | } | |
265 | } | |
266 | return device; | |
267 | } | |
268 | ||
269 | /** | |
270 | * dock_remove_acpi_device - remove the acpi_device struct from acpi | |
271 | * @handle - the handle of the device to remove | |
272 | * | |
273 | * Tell acpi to remove the acpi_device. This should cause any loaded | |
274 | * driver to have it's remove routine called. | |
275 | */ | |
276 | static void dock_remove_acpi_device(acpi_handle handle) | |
277 | { | |
278 | struct acpi_device *device; | |
279 | int ret; | |
280 | ||
281 | if (!acpi_bus_get_device(handle, &device)) { | |
282 | ret = acpi_bus_trim(device, 1); | |
283 | if (ret) | |
284 | pr_debug("error removing bus, %x\n", -ret); | |
285 | } | |
286 | } | |
287 | ||
288 | ||
289 | /** | |
290 | * hotplug_dock_devices - insert or remove devices on the dock station | |
291 | * @ds: the dock station | |
292 | * @event: either bus check or eject request | |
293 | * | |
294 | * Some devices on the dock station need to have drivers called | |
295 | * to perform hotplug operations after a dock event has occurred. | |
296 | * Traverse the list of dock devices that have registered a | |
297 | * hotplug handler, and call the handler. | |
298 | */ | |
299 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) | |
300 | { | |
301 | struct dock_dependent_device *dd; | |
302 | ||
8b0dc866 | 303 | mutex_lock(&ds->hp_lock); |
c8f7a62c LB |
304 | |
305 | /* | |
306 | * First call driver specific hotplug functions | |
307 | */ | |
308 | list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { | |
309 | if (dd->handler) | |
310 | dd->handler(dd->handle, event, dd->context); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Now make sure that an acpi_device is created for each | |
315 | * dependent device, or removed if this is an eject request. | |
316 | * This will cause acpi_drivers to be stopped/started if they | |
317 | * exist | |
318 | */ | |
319 | list_for_each_entry(dd, &ds->dependent_devices, list) { | |
320 | if (event == ACPI_NOTIFY_EJECT_REQUEST) | |
321 | dock_remove_acpi_device(dd->handle); | |
322 | else | |
323 | dock_create_acpi_device(dd->handle); | |
324 | } | |
8b0dc866 | 325 | mutex_unlock(&ds->hp_lock); |
c8f7a62c LB |
326 | } |
327 | ||
328 | static void dock_event(struct dock_station *ds, u32 event, int num) | |
329 | { | |
8ea86e0b | 330 | struct device *dev = &dock_device.dev; |
5669021e | 331 | /* |
8ea86e0b KCA |
332 | * Indicate that the status of the dock station has |
333 | * changed. | |
5669021e | 334 | */ |
8ea86e0b | 335 | kobject_uevent(&dev->kobj, KOBJ_CHANGE); |
c8f7a62c LB |
336 | } |
337 | ||
338 | /** | |
339 | * eject_dock - respond to a dock eject request | |
340 | * @ds: the dock station | |
341 | * | |
342 | * This is called after _DCK is called, to execute the dock station's | |
343 | * _EJ0 method. | |
344 | */ | |
345 | static void eject_dock(struct dock_station *ds) | |
346 | { | |
347 | struct acpi_object_list arg_list; | |
348 | union acpi_object arg; | |
349 | acpi_status status; | |
350 | acpi_handle tmp; | |
351 | ||
352 | /* all dock devices should have _EJ0, but check anyway */ | |
353 | status = acpi_get_handle(ds->handle, "_EJ0", &tmp); | |
354 | if (ACPI_FAILURE(status)) { | |
355 | pr_debug("No _EJ0 support for dock device\n"); | |
356 | return; | |
357 | } | |
358 | ||
359 | arg_list.count = 1; | |
360 | arg_list.pointer = &arg; | |
361 | arg.type = ACPI_TYPE_INTEGER; | |
362 | arg.integer.value = 1; | |
363 | ||
364 | if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", | |
365 | &arg_list, NULL))) | |
366 | pr_debug("Failed to evaluate _EJ0!\n"); | |
367 | } | |
368 | ||
369 | /** | |
370 | * handle_dock - handle a dock event | |
371 | * @ds: the dock station | |
372 | * @dock: to dock, or undock - that is the question | |
373 | * | |
374 | * Execute the _DCK method in response to an acpi event | |
375 | */ | |
376 | static void handle_dock(struct dock_station *ds, int dock) | |
377 | { | |
378 | acpi_status status; | |
379 | struct acpi_object_list arg_list; | |
380 | union acpi_object arg; | |
381 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
382 | struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
383 | union acpi_object *obj; | |
384 | ||
385 | acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); | |
386 | obj = name_buffer.pointer; | |
387 | ||
388 | printk(KERN_INFO PREFIX "%s\n", dock ? "docking" : "undocking"); | |
389 | ||
390 | /* _DCK method has one argument */ | |
391 | arg_list.count = 1; | |
392 | arg_list.pointer = &arg; | |
393 | arg.type = ACPI_TYPE_INTEGER; | |
394 | arg.integer.value = dock; | |
395 | status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); | |
396 | if (ACPI_FAILURE(status)) | |
397 | pr_debug("%s: failed to execute _DCK\n", obj->string.pointer); | |
398 | kfree(buffer.pointer); | |
399 | kfree(name_buffer.pointer); | |
400 | } | |
401 | ||
402 | static inline void dock(struct dock_station *ds) | |
403 | { | |
404 | handle_dock(ds, 1); | |
405 | } | |
406 | ||
407 | static inline void undock(struct dock_station *ds) | |
408 | { | |
409 | handle_dock(ds, 0); | |
410 | } | |
411 | ||
412 | static inline void begin_dock(struct dock_station *ds) | |
413 | { | |
414 | ds->flags |= DOCK_DOCKING; | |
415 | } | |
416 | ||
417 | static inline void complete_dock(struct dock_station *ds) | |
418 | { | |
419 | ds->flags &= ~(DOCK_DOCKING); | |
420 | ds->last_dock_time = jiffies; | |
421 | } | |
422 | ||
423 | /** | |
424 | * dock_in_progress - see if we are in the middle of handling a dock event | |
425 | * @ds: the dock station | |
426 | * | |
427 | * Sometimes while docking, false dock events can be sent to the driver | |
428 | * because good connections aren't made or some other reason. Ignore these | |
429 | * if we are in the middle of doing something. | |
430 | */ | |
431 | static int dock_in_progress(struct dock_station *ds) | |
432 | { | |
433 | if ((ds->flags & DOCK_DOCKING) || | |
434 | time_before(jiffies, (ds->last_dock_time + HZ))) | |
435 | return 1; | |
436 | return 0; | |
437 | } | |
438 | ||
439 | /** | |
440 | * register_dock_notifier - add yourself to the dock notifier list | |
441 | * @nb: the callers notifier block | |
442 | * | |
443 | * If a driver wishes to be notified about dock events, they can | |
444 | * use this function to put a notifier block on the dock notifier list. | |
445 | * this notifier call chain will be called after a dock event, but | |
446 | * before hotplugging any new devices. | |
447 | */ | |
448 | int register_dock_notifier(struct notifier_block *nb) | |
449 | { | |
2548c06b PB |
450 | if (!dock_station) |
451 | return -ENODEV; | |
452 | ||
c8f7a62c LB |
453 | return atomic_notifier_chain_register(&dock_notifier_list, nb); |
454 | } | |
455 | ||
456 | EXPORT_SYMBOL_GPL(register_dock_notifier); | |
457 | ||
458 | /** | |
459 | * unregister_dock_notifier - remove yourself from the dock notifier list | |
460 | * @nb: the callers notifier block | |
461 | */ | |
462 | void unregister_dock_notifier(struct notifier_block *nb) | |
463 | { | |
2548c06b PB |
464 | if (!dock_station) |
465 | return; | |
466 | ||
c8f7a62c LB |
467 | atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
468 | } | |
469 | ||
470 | EXPORT_SYMBOL_GPL(unregister_dock_notifier); | |
471 | ||
472 | /** | |
473 | * register_hotplug_dock_device - register a hotplug function | |
474 | * @handle: the handle of the device | |
475 | * @handler: the acpi_notifier_handler to call after docking | |
476 | * @context: device specific data | |
477 | * | |
478 | * If a driver would like to perform a hotplug operation after a dock | |
479 | * event, they can register an acpi_notifiy_handler to be called by | |
480 | * the dock driver after _DCK is executed. | |
481 | */ | |
482 | int | |
483 | register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler, | |
484 | void *context) | |
485 | { | |
486 | struct dock_dependent_device *dd; | |
487 | ||
488 | if (!dock_station) | |
489 | return -ENODEV; | |
490 | ||
491 | /* | |
492 | * make sure this handle is for a device dependent on the dock, | |
493 | * this would include the dock station itself | |
494 | */ | |
495 | dd = find_dock_dependent_device(dock_station, handle); | |
496 | if (dd) { | |
497 | dd->handler = handler; | |
498 | dd->context = context; | |
499 | dock_add_hotplug_device(dock_station, dd); | |
500 | return 0; | |
501 | } | |
502 | ||
503 | return -EINVAL; | |
504 | } | |
505 | ||
506 | EXPORT_SYMBOL_GPL(register_hotplug_dock_device); | |
507 | ||
508 | /** | |
509 | * unregister_hotplug_dock_device - remove yourself from the hotplug list | |
510 | * @handle: the acpi handle of the device | |
511 | */ | |
512 | void unregister_hotplug_dock_device(acpi_handle handle) | |
513 | { | |
514 | struct dock_dependent_device *dd; | |
515 | ||
516 | if (!dock_station) | |
517 | return; | |
518 | ||
519 | dd = find_dock_dependent_device(dock_station, handle); | |
520 | if (dd) | |
521 | dock_del_hotplug_device(dock_station, dd); | |
522 | } | |
523 | ||
524 | EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); | |
525 | ||
c80fdbe8 | 526 | /** |
527 | * handle_eject_request - handle an undock request checking for error conditions | |
528 | * | |
529 | * Check to make sure the dock device is still present, then undock and | |
530 | * hotremove all the devices that may need removing. | |
531 | */ | |
532 | static int handle_eject_request(struct dock_station *ds, u32 event) | |
533 | { | |
534 | if (!dock_present(ds)) | |
535 | return -ENODEV; | |
536 | ||
537 | if (dock_in_progress(ds)) | |
538 | return -EBUSY; | |
539 | ||
540 | /* | |
541 | * here we need to generate the undock | |
542 | * event prior to actually doing the undock | |
543 | * so that the device struct still exists. | |
544 | */ | |
545 | dock_event(ds, event, UNDOCK_EVENT); | |
546 | hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); | |
547 | undock(ds); | |
548 | eject_dock(ds); | |
549 | if (dock_present(ds)) { | |
550 | printk(KERN_ERR PREFIX "Unable to undock!\n"); | |
551 | return -EBUSY; | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
c8f7a62c LB |
557 | /** |
558 | * dock_notify - act upon an acpi dock notification | |
559 | * @handle: the dock station handle | |
560 | * @event: the acpi event | |
561 | * @data: our driver data struct | |
562 | * | |
563 | * If we are notified to dock, then check to see if the dock is | |
564 | * present and then dock. Notify all drivers of the dock event, | |
c80fdbe8 | 565 | * and then hotplug and devices that may need hotplugging. |
c8f7a62c LB |
566 | */ |
567 | static void dock_notify(acpi_handle handle, u32 event, void *data) | |
568 | { | |
50dd0969 | 569 | struct dock_station *ds = data; |
c8f7a62c LB |
570 | |
571 | switch (event) { | |
572 | case ACPI_NOTIFY_BUS_CHECK: | |
573 | if (!dock_in_progress(ds) && dock_present(ds)) { | |
574 | begin_dock(ds); | |
575 | dock(ds); | |
576 | if (!dock_present(ds)) { | |
577 | printk(KERN_ERR PREFIX "Unable to dock!\n"); | |
578 | break; | |
579 | } | |
580 | atomic_notifier_call_chain(&dock_notifier_list, | |
581 | event, NULL); | |
582 | hotplug_dock_devices(ds, event); | |
583 | complete_dock(ds); | |
584 | dock_event(ds, event, DOCK_EVENT); | |
585 | } | |
586 | break; | |
587 | case ACPI_NOTIFY_DEVICE_CHECK: | |
588 | /* | |
589 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification | |
590 | * is sent and _DCK is present, it is assumed to mean an | |
591 | * undock request. This notify routine will only be called | |
592 | * for objects defining _DCK, so we will fall through to eject | |
593 | * request here. However, we will pass an eject request through | |
594 | * to the driver who wish to hotplug. | |
595 | */ | |
596 | case ACPI_NOTIFY_EJECT_REQUEST: | |
c80fdbe8 | 597 | handle_eject_request(ds, event); |
c8f7a62c LB |
598 | break; |
599 | default: | |
600 | printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); | |
601 | } | |
602 | } | |
603 | ||
604 | /** | |
605 | * find_dock_devices - find devices on the dock station | |
606 | * @handle: the handle of the device we are examining | |
607 | * @lvl: unused | |
608 | * @context: the dock station private data | |
609 | * @rv: unused | |
610 | * | |
611 | * This function is called by acpi_walk_namespace. It will | |
612 | * check to see if an object has an _EJD method. If it does, then it | |
613 | * will see if it is dependent on the dock station. | |
614 | */ | |
615 | static acpi_status | |
616 | find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) | |
617 | { | |
618 | acpi_status status; | |
fe9a2f77 | 619 | acpi_handle tmp, parent; |
50dd0969 | 620 | struct dock_station *ds = context; |
c8f7a62c LB |
621 | struct dock_dependent_device *dd; |
622 | ||
623 | status = acpi_bus_get_ejd(handle, &tmp); | |
fe9a2f77 KCA |
624 | if (ACPI_FAILURE(status)) { |
625 | /* try the parent device as well */ | |
626 | status = acpi_get_parent(handle, &parent); | |
627 | if (ACPI_FAILURE(status)) | |
628 | goto fdd_out; | |
629 | /* see if parent is dependent on dock */ | |
630 | status = acpi_bus_get_ejd(parent, &tmp); | |
631 | if (ACPI_FAILURE(status)) | |
632 | goto fdd_out; | |
633 | } | |
c8f7a62c LB |
634 | |
635 | if (tmp == ds->handle) { | |
636 | dd = alloc_dock_dependent_device(handle); | |
637 | if (dd) | |
638 | add_dock_dependent_device(ds, dd); | |
639 | } | |
fe9a2f77 | 640 | fdd_out: |
c8f7a62c LB |
641 | return AE_OK; |
642 | } | |
643 | ||
c80fdbe8 | 644 | /* |
645 | * show_docked - read method for "docked" file in sysfs | |
646 | */ | |
647 | static ssize_t show_docked(struct device *dev, | |
648 | struct device_attribute *attr, char *buf) | |
649 | { | |
650 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station)); | |
651 | ||
652 | } | |
653 | DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); | |
654 | ||
655 | /* | |
656 | * write_undock - write method for "undock" file in sysfs | |
657 | */ | |
658 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, | |
659 | const char *buf, size_t count) | |
660 | { | |
661 | int ret; | |
662 | ||
663 | if (!count) | |
664 | return -EINVAL; | |
665 | ||
666 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); | |
667 | return ret ? ret: count; | |
668 | } | |
669 | DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); | |
670 | ||
ac122bb6 IVE |
671 | /* |
672 | * show_dock_uid - read method for "uid" file in sysfs | |
673 | */ | |
674 | static ssize_t show_dock_uid(struct device *dev, | |
675 | struct device_attribute *attr, char *buf) | |
676 | { | |
677 | unsigned long lbuf; | |
62a6d7fd | 678 | acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", NULL, &lbuf); |
ac122bb6 IVE |
679 | if(ACPI_FAILURE(status)) { |
680 | return 0; | |
681 | } | |
682 | return snprintf(buf, PAGE_SIZE, "%lx\n", lbuf); | |
683 | } | |
684 | DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); | |
685 | ||
686 | ||
687 | ||
c8f7a62c LB |
688 | /** |
689 | * dock_add - add a new dock station | |
690 | * @handle: the dock station handle | |
691 | * | |
692 | * allocated and initialize a new dock station device. Find all devices | |
693 | * that are on the dock station, and register for dock event notifications. | |
694 | */ | |
695 | static int dock_add(acpi_handle handle) | |
696 | { | |
697 | int ret; | |
698 | acpi_status status; | |
699 | struct dock_dependent_device *dd; | |
700 | ||
701 | /* allocate & initialize the dock_station private data */ | |
702 | dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); | |
703 | if (!dock_station) | |
704 | return -ENOMEM; | |
705 | dock_station->handle = handle; | |
706 | dock_station->last_dock_time = jiffies - HZ; | |
707 | INIT_LIST_HEAD(&dock_station->dependent_devices); | |
708 | INIT_LIST_HEAD(&dock_station->hotplug_devices); | |
709 | spin_lock_init(&dock_station->dd_lock); | |
8b0dc866 | 710 | mutex_init(&dock_station->hp_lock); |
07a18684 | 711 | ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
c8f7a62c | 712 | |
671adbec KCA |
713 | /* initialize platform device stuff */ |
714 | dock_device.name = dock_device_name; | |
715 | ret = platform_device_register(&dock_device); | |
716 | if (ret) { | |
e67beb37 | 717 | printk(KERN_ERR PREFIX "Error %d registering dock device\n", ret); |
671adbec KCA |
718 | kfree(dock_station); |
719 | return ret; | |
720 | } | |
c80fdbe8 | 721 | ret = device_create_file(&dock_device.dev, &dev_attr_docked); |
722 | if (ret) { | |
723 | printk("Error %d adding sysfs file\n", ret); | |
724 | platform_device_unregister(&dock_device); | |
725 | kfree(dock_station); | |
726 | return ret; | |
727 | } | |
728 | ret = device_create_file(&dock_device.dev, &dev_attr_undock); | |
729 | if (ret) { | |
730 | printk("Error %d adding sysfs file\n", ret); | |
731 | device_remove_file(&dock_device.dev, &dev_attr_docked); | |
732 | platform_device_unregister(&dock_device); | |
733 | kfree(dock_station); | |
734 | return ret; | |
735 | } | |
ac122bb6 IVE |
736 | ret = device_create_file(&dock_device.dev, &dev_attr_uid); |
737 | if (ret) { | |
738 | printk("Error %d adding sysfs file\n", ret); | |
739 | platform_device_unregister(&dock_device); | |
740 | kfree(dock_station); | |
741 | return ret; | |
742 | } | |
671adbec | 743 | |
c8f7a62c LB |
744 | /* Find dependent devices */ |
745 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
746 | ACPI_UINT32_MAX, find_dock_devices, dock_station, | |
747 | NULL); | |
748 | ||
749 | /* add the dock station as a device dependent on itself */ | |
750 | dd = alloc_dock_dependent_device(handle); | |
751 | if (!dd) { | |
752 | kfree(dock_station); | |
671adbec KCA |
753 | ret = -ENOMEM; |
754 | goto dock_add_err_unregister; | |
c8f7a62c LB |
755 | } |
756 | add_dock_dependent_device(dock_station, dd); | |
757 | ||
758 | /* register for dock events */ | |
759 | status = acpi_install_notify_handler(dock_station->handle, | |
760 | ACPI_SYSTEM_NOTIFY, | |
761 | dock_notify, dock_station); | |
762 | ||
763 | if (ACPI_FAILURE(status)) { | |
764 | printk(KERN_ERR PREFIX "Error installing notify handler\n"); | |
765 | ret = -ENODEV; | |
766 | goto dock_add_err; | |
767 | } | |
768 | ||
7cda93e0 | 769 | printk(KERN_INFO PREFIX "%s \n", ACPI_DOCK_DRIVER_DESCRIPTION); |
c8f7a62c LB |
770 | |
771 | return 0; | |
772 | ||
773 | dock_add_err: | |
c8f7a62c | 774 | kfree(dd); |
671adbec | 775 | dock_add_err_unregister: |
c80fdbe8 | 776 | device_remove_file(&dock_device.dev, &dev_attr_docked); |
777 | device_remove_file(&dock_device.dev, &dev_attr_undock); | |
671adbec KCA |
778 | platform_device_unregister(&dock_device); |
779 | kfree(dock_station); | |
c8f7a62c LB |
780 | return ret; |
781 | } | |
782 | ||
783 | /** | |
784 | * dock_remove - free up resources related to the dock station | |
785 | */ | |
786 | static int dock_remove(void) | |
787 | { | |
788 | struct dock_dependent_device *dd, *tmp; | |
789 | acpi_status status; | |
790 | ||
791 | if (!dock_station) | |
792 | return 0; | |
793 | ||
794 | /* remove dependent devices */ | |
795 | list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, | |
796 | list) | |
797 | kfree(dd); | |
798 | ||
799 | /* remove dock notify handler */ | |
800 | status = acpi_remove_notify_handler(dock_station->handle, | |
801 | ACPI_SYSTEM_NOTIFY, | |
802 | dock_notify); | |
803 | if (ACPI_FAILURE(status)) | |
804 | printk(KERN_ERR "Error removing notify handler\n"); | |
805 | ||
671adbec | 806 | /* cleanup sysfs */ |
c80fdbe8 | 807 | device_remove_file(&dock_device.dev, &dev_attr_docked); |
808 | device_remove_file(&dock_device.dev, &dev_attr_undock); | |
671adbec KCA |
809 | platform_device_unregister(&dock_device); |
810 | ||
c8f7a62c LB |
811 | /* free dock station memory */ |
812 | kfree(dock_station); | |
813 | return 0; | |
814 | } | |
815 | ||
816 | /** | |
817 | * find_dock - look for a dock station | |
818 | * @handle: acpi handle of a device | |
819 | * @lvl: unused | |
820 | * @context: counter of dock stations found | |
821 | * @rv: unused | |
822 | * | |
823 | * This is called by acpi_walk_namespace to look for dock stations. | |
824 | */ | |
825 | static acpi_status | |
826 | find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) | |
827 | { | |
50dd0969 | 828 | int *count = context; |
c8f7a62c LB |
829 | acpi_status status = AE_OK; |
830 | ||
831 | if (is_dock(handle)) { | |
832 | if (dock_add(handle) >= 0) { | |
833 | (*count)++; | |
834 | status = AE_CTRL_TERMINATE; | |
835 | } | |
836 | } | |
837 | return status; | |
838 | } | |
839 | ||
840 | static int __init dock_init(void) | |
841 | { | |
842 | int num = 0; | |
843 | ||
844 | dock_station = NULL; | |
845 | ||
846 | /* look for a dock station */ | |
847 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
848 | ACPI_UINT32_MAX, find_dock, &num, NULL); | |
849 | ||
850 | if (!num) | |
2548c06b | 851 | printk(KERN_INFO "No dock devices found.\n"); |
c8f7a62c LB |
852 | |
853 | return 0; | |
854 | } | |
855 | ||
856 | static void __exit dock_exit(void) | |
857 | { | |
858 | dock_remove(); | |
859 | } | |
860 | ||
861 | postcore_initcall(dock_init); | |
862 | module_exit(dock_exit); |