blob: b2586f57e1f5fc1347757cbf24044acbac922a8d [file] [log] [blame]
Len Brownc8f7a622006-07-09 17:22:28 -04001/*
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>
Kristen Carlson Accardi671adbe2006-12-04 14:49:43 -080030#include <linux/platform_device.h>
Al Viro914e2632006-10-18 13:55:46 -040031#include <linux/jiffies.h>
Randy Dunlap62a6d7f2007-03-26 21:38:49 -080032#include <linux/stddef.h>
Len Brownc8f7a622006-07-09 17:22:28 -040033#include <acpi/acpi_bus.h>
34#include <acpi/acpi_drivers.h>
35
Len Browna192a952009-07-28 16:45:54 -040036#define PREFIX "ACPI: "
37
Len Brown7cda93e2007-02-12 23:50:02 -050038#define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver"
Len Brownc8f7a622006-07-09 17:22:28 -040039
Len Brownf52fd662007-02-12 22:42:12 -050040ACPI_MODULE_NAME("dock");
Len Brownc8f7a622006-07-09 17:22:28 -040041MODULE_AUTHOR("Kristen Carlson Accardi");
Len Brown7cda93e2007-02-12 23:50:02 -050042MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION);
Len Brownc8f7a622006-07-09 17:22:28 -040043MODULE_LICENSE("GPL");
44
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -070045static int immediate_undock = 1;
46module_param(immediate_undock, bool, 0644);
47MODULE_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
Len Brownc8f7a622006-07-09 17:22:28 -040052static struct atomic_notifier_head dock_notifier_list;
53
Frank Seidela340af12007-12-07 13:20:42 +010054static const struct acpi_device_id dock_device_ids[] = {
55 {"LNXDOCK", 0},
56 {"", 0},
57};
58MODULE_DEVICE_TABLE(acpi, dock_device_ids);
59
Len Brownc8f7a622006-07-09 17:22:28 -040060struct dock_station {
61 acpi_handle handle;
62 unsigned long last_dock_time;
63 u32 flags;
64 spinlock_t dd_lock;
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -080065 struct mutex hp_lock;
Len Brownc8f7a622006-07-09 17:22:28 -040066 struct list_head dependent_devices;
67 struct list_head hotplug_devices;
Shaohua Lidb350b02008-08-28 10:03:58 +080068
Alex Chiang50d716e2009-10-01 11:59:23 -060069 struct list_head sibling;
Shaohua Lidb350b02008-08-28 10:03:58 +080070 struct platform_device *dock_device;
Len Brownc8f7a622006-07-09 17:22:28 -040071};
Shaohua Lidb350b02008-08-28 10:03:58 +080072static LIST_HEAD(dock_stations);
73static int dock_station_count;
Len Brownc8f7a622006-07-09 17:22:28 -040074
75struct dock_dependent_device {
76 struct list_head list;
77 struct list_head hotplug_list;
78 acpi_handle handle;
Shaohua Li1253f7a2008-08-28 10:06:16 +080079 struct acpi_dock_ops *ops;
Len Brownc8f7a622006-07-09 17:22:28 -040080 void *context;
81};
82
83#define DOCK_DOCKING 0x00000001
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -070084#define DOCK_UNDOCKING 0x00000002
Shaohua Lidb350b02008-08-28 10:03:58 +080085#define DOCK_IS_DOCK 0x00000010
86#define DOCK_IS_ATA 0x00000020
87#define DOCK_IS_BAT 0x00000040
Kristen Carlson Accardi56690212006-08-01 14:59:19 -070088#define DOCK_EVENT 3
89#define UNDOCK_EVENT 2
Len Brownc8f7a622006-07-09 17:22:28 -040090
Len Brownc8f7a622006-07-09 17:22:28 -040091/*****************************************************************************
92 * Dock Dependent device functions *
93 *****************************************************************************/
94/**
Alex Chiangf69cfdd2009-10-19 15:14:29 -060095 * add_dock_dependent_device - associate a device with the dock station
96 * @ds: The dock station
97 * @handle: handle of the dependent device
Len Brownc8f7a622006-07-09 17:22:28 -040098 *
Alex Chiangf69cfdd2009-10-19 15:14:29 -060099 * Add the dependent device to the dock's dependent device list.
Len Brownc8f7a622006-07-09 17:22:28 -0400100 */
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600101static int
102add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
Len Brownc8f7a622006-07-09 17:22:28 -0400103{
104 struct dock_dependent_device *dd;
105
106 dd = kzalloc(sizeof(*dd), GFP_KERNEL);
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600107 if (!dd)
108 return -ENOMEM;
Len Brownc8f7a622006-07-09 17:22:28 -0400109
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600110 dd->handle = handle;
111 INIT_LIST_HEAD(&dd->list);
112 INIT_LIST_HEAD(&dd->hotplug_list);
113
Len Brownc8f7a622006-07-09 17:22:28 -0400114 spin_lock(&ds->dd_lock);
115 list_add_tail(&dd->list, &ds->dependent_devices);
116 spin_unlock(&ds->dd_lock);
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600117
118 return 0;
Len Brownc8f7a622006-07-09 17:22:28 -0400119}
120
121/**
122 * dock_add_hotplug_device - associate a hotplug handler with the dock station
123 * @ds: The dock station
124 * @dd: The dependent device struct
125 *
126 * Add the dependent device to the dock's hotplug device list
127 */
128static void
129dock_add_hotplug_device(struct dock_station *ds,
130 struct dock_dependent_device *dd)
131{
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800132 mutex_lock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400133 list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800134 mutex_unlock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400135}
136
137/**
138 * dock_del_hotplug_device - remove a hotplug handler from the dock station
139 * @ds: The dock station
140 * @dd: the dependent device struct
141 *
142 * Delete the dependent device from the dock's hotplug device list
143 */
144static void
145dock_del_hotplug_device(struct dock_station *ds,
146 struct dock_dependent_device *dd)
147{
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800148 mutex_lock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400149 list_del(&dd->hotplug_list);
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800150 mutex_unlock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400151}
152
153/**
154 * find_dock_dependent_device - get a device dependent on this dock
155 * @ds: the dock station
156 * @handle: the acpi_handle of the device we want
157 *
158 * iterate over the dependent device list for this dock. If the
159 * dependent device matches the handle, return.
160 */
161static struct dock_dependent_device *
162find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
163{
164 struct dock_dependent_device *dd;
165
166 spin_lock(&ds->dd_lock);
167 list_for_each_entry(dd, &ds->dependent_devices, list) {
168 if (handle == dd->handle) {
169 spin_unlock(&ds->dd_lock);
170 return dd;
171 }
172 }
173 spin_unlock(&ds->dd_lock);
174 return NULL;
175}
176
177/*****************************************************************************
178 * Dock functions *
179 *****************************************************************************/
180/**
181 * is_dock - see if a device is a dock station
182 * @handle: acpi handle of the device
183 *
184 * If an acpi object has a _DCK method, then it is by definition a dock
185 * station, so return true.
186 */
187static int is_dock(acpi_handle handle)
188{
189 acpi_status status;
190 acpi_handle tmp;
191
192 status = acpi_get_handle(handle, "_DCK", &tmp);
193 if (ACPI_FAILURE(status))
194 return 0;
195 return 1;
196}
197
Shaohua Lidb350b02008-08-28 10:03:58 +0800198static int is_ejectable(acpi_handle handle)
199{
200 acpi_status status;
201 acpi_handle tmp;
202
203 status = acpi_get_handle(handle, "_EJ0", &tmp);
204 if (ACPI_FAILURE(status))
205 return 0;
206 return 1;
207}
208
209static int is_ata(acpi_handle handle)
210{
211 acpi_handle tmp;
212
213 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
214 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
215 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
216 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
217 return 1;
218
219 return 0;
220}
221
222static int is_battery(acpi_handle handle)
223{
224 struct acpi_device_info *info;
Shaohua Lidb350b02008-08-28 10:03:58 +0800225 int ret = 1;
226
Bob Moore15b8dd52009-06-29 13:39:29 +0800227 if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info)))
Shaohua Lidb350b02008-08-28 10:03:58 +0800228 return 0;
Shaohua Lidb350b02008-08-28 10:03:58 +0800229 if (!(info->valid & ACPI_VALID_HID))
230 ret = 0;
231 else
Bob Moore15b8dd52009-06-29 13:39:29 +0800232 ret = !strcmp("PNP0C0A", info->hardware_id.string);
Shaohua Lidb350b02008-08-28 10:03:58 +0800233
Bob Moore15b8dd52009-06-29 13:39:29 +0800234 kfree(info);
Shaohua Lidb350b02008-08-28 10:03:58 +0800235 return ret;
236}
237
238static int is_ejectable_bay(acpi_handle handle)
239{
240 acpi_handle phandle;
Alex Chiang747479a2009-10-19 15:14:50 -0600241
Shaohua Lidb350b02008-08-28 10:03:58 +0800242 if (!is_ejectable(handle))
243 return 0;
244 if (is_battery(handle) || is_ata(handle))
245 return 1;
246 if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
247 return 1;
248 return 0;
249}
250
Len Brownc8f7a622006-07-09 17:22:28 -0400251/**
252 * is_dock_device - see if a device is on a dock station
253 * @handle: acpi handle of the device
254 *
255 * If this device is either the dock station itself,
256 * or is a device dependent on the dock station, then it
257 * is a dock device
258 */
259int is_dock_device(acpi_handle handle)
260{
Shaohua Lidb350b02008-08-28 10:03:58 +0800261 struct dock_station *dock_station;
262
263 if (!dock_station_count)
Len Brownc8f7a622006-07-09 17:22:28 -0400264 return 0;
265
Shaohua Lidb350b02008-08-28 10:03:58 +0800266 if (is_dock(handle))
Len Brownc8f7a622006-07-09 17:22:28 -0400267 return 1;
Alex Chiang747479a2009-10-19 15:14:50 -0600268
269 list_for_each_entry(dock_station, &dock_stations, sibling)
Shaohua Lidb350b02008-08-28 10:03:58 +0800270 if (find_dock_dependent_device(dock_station, handle))
271 return 1;
Len Brownc8f7a622006-07-09 17:22:28 -0400272
273 return 0;
274}
Len Brownc8f7a622006-07-09 17:22:28 -0400275EXPORT_SYMBOL_GPL(is_dock_device);
276
277/**
278 * dock_present - see if the dock station is present.
279 * @ds: the dock station
280 *
281 * execute the _STA method. note that present does not
282 * imply that we are docked.
283 */
284static int dock_present(struct dock_station *ds)
285{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400286 unsigned long long sta;
Len Brownc8f7a622006-07-09 17:22:28 -0400287 acpi_status status;
288
289 if (ds) {
290 status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta);
291 if (ACPI_SUCCESS(status) && sta)
292 return 1;
293 }
294 return 0;
295}
296
Len Brownc8f7a622006-07-09 17:22:28 -0400297/**
298 * dock_create_acpi_device - add new devices to acpi
299 * @handle - handle of the device to add
300 *
301 * This function will create a new acpi_device for the given
302 * handle if one does not exist already. This should cause
303 * acpi to scan for drivers for the given devices, and call
304 * matching driver's add routine.
305 *
306 * Returns a pointer to the acpi_device corresponding to the handle.
307 */
308static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
309{
Alex Chiang747479a2009-10-19 15:14:50 -0600310 struct acpi_device *device;
Len Brownc8f7a622006-07-09 17:22:28 -0400311 struct acpi_device *parent_device;
312 acpi_handle parent;
313 int ret;
314
315 if (acpi_bus_get_device(handle, &device)) {
316 /*
317 * no device created for this object,
318 * so we should create one.
319 */
320 acpi_get_parent(handle, &parent);
321 if (acpi_bus_get_device(parent, &parent_device))
322 parent_device = NULL;
323
324 ret = acpi_bus_add(&device, parent_device, handle,
325 ACPI_BUS_TYPE_DEVICE);
326 if (ret) {
Alex Chiang747479a2009-10-19 15:14:50 -0600327 pr_debug("error adding bus, %x\n", -ret);
Len Brownc8f7a622006-07-09 17:22:28 -0400328 return NULL;
329 }
330 }
331 return device;
332}
333
334/**
335 * dock_remove_acpi_device - remove the acpi_device struct from acpi
336 * @handle - the handle of the device to remove
337 *
338 * Tell acpi to remove the acpi_device. This should cause any loaded
339 * driver to have it's remove routine called.
340 */
341static void dock_remove_acpi_device(acpi_handle handle)
342{
343 struct acpi_device *device;
344 int ret;
345
346 if (!acpi_bus_get_device(handle, &device)) {
347 ret = acpi_bus_trim(device, 1);
348 if (ret)
349 pr_debug("error removing bus, %x\n", -ret);
350 }
351}
352
Len Brownc8f7a622006-07-09 17:22:28 -0400353/**
354 * hotplug_dock_devices - insert or remove devices on the dock station
355 * @ds: the dock station
356 * @event: either bus check or eject request
357 *
358 * Some devices on the dock station need to have drivers called
359 * to perform hotplug operations after a dock event has occurred.
360 * Traverse the list of dock devices that have registered a
361 * hotplug handler, and call the handler.
362 */
363static void hotplug_dock_devices(struct dock_station *ds, u32 event)
364{
365 struct dock_dependent_device *dd;
366
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800367 mutex_lock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400368
369 /*
370 * First call driver specific hotplug functions
371 */
Alex Chiang747479a2009-10-19 15:14:50 -0600372 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
Shaohua Li1253f7a2008-08-28 10:06:16 +0800373 if (dd->ops && dd->ops->handler)
374 dd->ops->handler(dd->handle, event, dd->context);
Len Brownc8f7a622006-07-09 17:22:28 -0400375
376 /*
377 * Now make sure that an acpi_device is created for each
378 * dependent device, or removed if this is an eject request.
379 * This will cause acpi_drivers to be stopped/started if they
380 * exist
381 */
382 list_for_each_entry(dd, &ds->dependent_devices, list) {
383 if (event == ACPI_NOTIFY_EJECT_REQUEST)
384 dock_remove_acpi_device(dd->handle);
385 else
386 dock_create_acpi_device(dd->handle);
387 }
Kristen Carlson Accardi8b0dc862006-10-30 11:18:45 -0800388 mutex_unlock(&ds->hp_lock);
Len Brownc8f7a622006-07-09 17:22:28 -0400389}
390
391static void dock_event(struct dock_station *ds, u32 event, int num)
392{
Shaohua Lidb350b02008-08-28 10:03:58 +0800393 struct device *dev = &ds->dock_device->dev;
Holger Macht66b56822007-08-10 13:10:32 -0700394 char event_string[13];
Kristen Carlson Accardi79a8f702007-05-09 15:10:22 -0700395 char *envp[] = { event_string, NULL };
Shaohua Li1253f7a2008-08-28 10:06:16 +0800396 struct dock_dependent_device *dd;
Kristen Carlson Accardi79a8f702007-05-09 15:10:22 -0700397
398 if (num == UNDOCK_EVENT)
Holger Macht66b56822007-08-10 13:10:32 -0700399 sprintf(event_string, "EVENT=undock");
Kristen Carlson Accardi79a8f702007-05-09 15:10:22 -0700400 else
Holger Macht66b56822007-08-10 13:10:32 -0700401 sprintf(event_string, "EVENT=dock");
Kristen Carlson Accardi79a8f702007-05-09 15:10:22 -0700402
Kristen Carlson Accardi56690212006-08-01 14:59:19 -0700403 /*
Kristen Carlson Accardi8ea86e02006-12-11 12:05:08 -0800404 * Indicate that the status of the dock station has
405 * changed.
Kristen Carlson Accardi56690212006-08-01 14:59:19 -0700406 */
Shaohua Li1253f7a2008-08-28 10:06:16 +0800407 if (num == DOCK_EVENT)
408 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
409
410 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
411 if (dd->ops && dd->ops->uevent)
412 dd->ops->uevent(dd->handle, event, dd->context);
Alex Chiang747479a2009-10-19 15:14:50 -0600413
Shaohua Li1253f7a2008-08-28 10:06:16 +0800414 if (num != DOCK_EVENT)
415 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
Len Brownc8f7a622006-07-09 17:22:28 -0400416}
417
418/**
419 * eject_dock - respond to a dock eject request
420 * @ds: the dock station
421 *
422 * This is called after _DCK is called, to execute the dock station's
423 * _EJ0 method.
424 */
425static void eject_dock(struct dock_station *ds)
426{
427 struct acpi_object_list arg_list;
428 union acpi_object arg;
429 acpi_status status;
430 acpi_handle tmp;
431
432 /* all dock devices should have _EJ0, but check anyway */
433 status = acpi_get_handle(ds->handle, "_EJ0", &tmp);
434 if (ACPI_FAILURE(status)) {
435 pr_debug("No _EJ0 support for dock device\n");
436 return;
437 }
438
439 arg_list.count = 1;
440 arg_list.pointer = &arg;
441 arg.type = ACPI_TYPE_INTEGER;
442 arg.integer.value = 1;
443
Alex Chiang747479a2009-10-19 15:14:50 -0600444 status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL);
445 if (ACPI_FAILURE(status))
Len Brownc8f7a622006-07-09 17:22:28 -0400446 pr_debug("Failed to evaluate _EJ0!\n");
447}
448
449/**
450 * handle_dock - handle a dock event
451 * @ds: the dock station
452 * @dock: to dock, or undock - that is the question
453 *
454 * Execute the _DCK method in response to an acpi event
455 */
456static void handle_dock(struct dock_station *ds, int dock)
457{
458 acpi_status status;
459 struct acpi_object_list arg_list;
460 union acpi_object arg;
461 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
462 struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Len Brownc8f7a622006-07-09 17:22:28 -0400463
464 acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer);
Len Brownc8f7a622006-07-09 17:22:28 -0400465
Dmitry Torokhov9254bc82007-07-18 01:10:24 -0400466 printk(KERN_INFO PREFIX "%s - %s\n",
467 (char *)name_buffer.pointer, dock ? "docking" : "undocking");
Len Brownc8f7a622006-07-09 17:22:28 -0400468
469 /* _DCK method has one argument */
470 arg_list.count = 1;
471 arg_list.pointer = &arg;
472 arg.type = ACPI_TYPE_INTEGER;
473 arg.integer.value = dock;
474 status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
Shaohua Lidb350b02008-08-28 10:03:58 +0800475 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
Thomas Renninger0a918a92008-10-11 00:15:04 -0400476 ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute"
477 " _DCK\n", (char *)name_buffer.pointer));
478
Len Brownc8f7a622006-07-09 17:22:28 -0400479 kfree(buffer.pointer);
480 kfree(name_buffer.pointer);
481}
482
483static inline void dock(struct dock_station *ds)
484{
485 handle_dock(ds, 1);
486}
487
488static inline void undock(struct dock_station *ds)
489{
490 handle_dock(ds, 0);
491}
492
493static inline void begin_dock(struct dock_station *ds)
494{
495 ds->flags |= DOCK_DOCKING;
496}
497
498static inline void complete_dock(struct dock_station *ds)
499{
500 ds->flags &= ~(DOCK_DOCKING);
501 ds->last_dock_time = jiffies;
502}
503
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700504static inline void begin_undock(struct dock_station *ds)
505{
506 ds->flags |= DOCK_UNDOCKING;
507}
508
509static inline void complete_undock(struct dock_station *ds)
510{
511 ds->flags &= ~(DOCK_UNDOCKING);
512}
513
Shaohua Li406f6922008-08-28 10:03:26 +0800514static void dock_lock(struct dock_station *ds, int lock)
515{
516 struct acpi_object_list arg_list;
517 union acpi_object arg;
518 acpi_status status;
519
520 arg_list.count = 1;
521 arg_list.pointer = &arg;
522 arg.type = ACPI_TYPE_INTEGER;
523 arg.integer.value = !!lock;
524 status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
525 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
526 if (lock)
527 printk(KERN_WARNING PREFIX "Locking device failed\n");
528 else
529 printk(KERN_WARNING PREFIX "Unlocking device failed\n");
530 }
531}
532
Len Brownc8f7a622006-07-09 17:22:28 -0400533/**
534 * dock_in_progress - see if we are in the middle of handling a dock event
535 * @ds: the dock station
536 *
537 * Sometimes while docking, false dock events can be sent to the driver
538 * because good connections aren't made or some other reason. Ignore these
539 * if we are in the middle of doing something.
540 */
541static int dock_in_progress(struct dock_station *ds)
542{
543 if ((ds->flags & DOCK_DOCKING) ||
544 time_before(jiffies, (ds->last_dock_time + HZ)))
545 return 1;
546 return 0;
547}
548
549/**
550 * register_dock_notifier - add yourself to the dock notifier list
551 * @nb: the callers notifier block
552 *
553 * If a driver wishes to be notified about dock events, they can
554 * use this function to put a notifier block on the dock notifier list.
555 * this notifier call chain will be called after a dock event, but
556 * before hotplugging any new devices.
557 */
558int register_dock_notifier(struct notifier_block *nb)
559{
Shaohua Lidb350b02008-08-28 10:03:58 +0800560 if (!dock_station_count)
Prarit Bhargava2548c062006-12-04 14:50:17 -0800561 return -ENODEV;
562
Len Brownc8f7a622006-07-09 17:22:28 -0400563 return atomic_notifier_chain_register(&dock_notifier_list, nb);
564}
Len Brownc8f7a622006-07-09 17:22:28 -0400565EXPORT_SYMBOL_GPL(register_dock_notifier);
566
567/**
568 * unregister_dock_notifier - remove yourself from the dock notifier list
569 * @nb: the callers notifier block
570 */
571void unregister_dock_notifier(struct notifier_block *nb)
572{
Shaohua Lidb350b02008-08-28 10:03:58 +0800573 if (!dock_station_count)
Prarit Bhargava2548c062006-12-04 14:50:17 -0800574 return;
575
Len Brownc8f7a622006-07-09 17:22:28 -0400576 atomic_notifier_chain_unregister(&dock_notifier_list, nb);
577}
Len Brownc8f7a622006-07-09 17:22:28 -0400578EXPORT_SYMBOL_GPL(unregister_dock_notifier);
579
580/**
581 * register_hotplug_dock_device - register a hotplug function
582 * @handle: the handle of the device
Shaohua Li1253f7a2008-08-28 10:06:16 +0800583 * @ops: handlers to call after docking
Len Brownc8f7a622006-07-09 17:22:28 -0400584 * @context: device specific data
585 *
586 * If a driver would like to perform a hotplug operation after a dock
587 * event, they can register an acpi_notifiy_handler to be called by
588 * the dock driver after _DCK is executed.
589 */
590int
Shaohua Li1253f7a2008-08-28 10:06:16 +0800591register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops,
Len Brownc8f7a622006-07-09 17:22:28 -0400592 void *context)
593{
594 struct dock_dependent_device *dd;
Shaohua Lidb350b02008-08-28 10:03:58 +0800595 struct dock_station *dock_station;
Shaohua Li61b83692008-08-28 10:07:14 +0800596 int ret = -EINVAL;
Len Brownc8f7a622006-07-09 17:22:28 -0400597
Shaohua Lidb350b02008-08-28 10:03:58 +0800598 if (!dock_station_count)
Len Brownc8f7a622006-07-09 17:22:28 -0400599 return -ENODEV;
600
601 /*
602 * make sure this handle is for a device dependent on the dock,
603 * this would include the dock station itself
604 */
Alex Chiang50d716e2009-10-01 11:59:23 -0600605 list_for_each_entry(dock_station, &dock_stations, sibling) {
Shaohua Li61b83692008-08-28 10:07:14 +0800606 /*
607 * An ATA bay can be in a dock and itself can be ejected
608 * seperately, so there are two 'dock stations' which need the
609 * ops
610 */
Shaohua Lidb350b02008-08-28 10:03:58 +0800611 dd = find_dock_dependent_device(dock_station, handle);
612 if (dd) {
Shaohua Li1253f7a2008-08-28 10:06:16 +0800613 dd->ops = ops;
Shaohua Lidb350b02008-08-28 10:03:58 +0800614 dd->context = context;
615 dock_add_hotplug_device(dock_station, dd);
Shaohua Li61b83692008-08-28 10:07:14 +0800616 ret = 0;
Shaohua Lidb350b02008-08-28 10:03:58 +0800617 }
Len Brownc8f7a622006-07-09 17:22:28 -0400618 }
619
Shaohua Li61b83692008-08-28 10:07:14 +0800620 return ret;
Len Brownc8f7a622006-07-09 17:22:28 -0400621}
Len Brownc8f7a622006-07-09 17:22:28 -0400622EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
623
624/**
625 * unregister_hotplug_dock_device - remove yourself from the hotplug list
626 * @handle: the acpi handle of the device
627 */
628void unregister_hotplug_dock_device(acpi_handle handle)
629{
630 struct dock_dependent_device *dd;
Shaohua Lidb350b02008-08-28 10:03:58 +0800631 struct dock_station *dock_station;
Len Brownc8f7a622006-07-09 17:22:28 -0400632
Shaohua Lidb350b02008-08-28 10:03:58 +0800633 if (!dock_station_count)
Len Brownc8f7a622006-07-09 17:22:28 -0400634 return;
635
Alex Chiang50d716e2009-10-01 11:59:23 -0600636 list_for_each_entry(dock_station, &dock_stations, sibling) {
Shaohua Lidb350b02008-08-28 10:03:58 +0800637 dd = find_dock_dependent_device(dock_station, handle);
638 if (dd)
639 dock_del_hotplug_device(dock_station, dd);
640 }
Len Brownc8f7a622006-07-09 17:22:28 -0400641}
Len Brownc8f7a622006-07-09 17:22:28 -0400642EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
643
644/**
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800645 * handle_eject_request - handle an undock request checking for error conditions
646 *
647 * Check to make sure the dock device is still present, then undock and
648 * hotremove all the devices that may need removing.
649 */
650static int handle_eject_request(struct dock_station *ds, u32 event)
651{
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800652 if (dock_in_progress(ds))
653 return -EBUSY;
654
655 /*
656 * here we need to generate the undock
657 * event prior to actually doing the undock
658 * so that the device struct still exists.
Holger Machtafd73012008-08-06 17:56:01 +0200659 * Also, even send the dock event if the
660 * device is not present anymore
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800661 */
662 dock_event(ds, event, UNDOCK_EVENT);
Holger Machtafd73012008-08-06 17:56:01 +0200663
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800664 hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
665 undock(ds);
Shaohua Li406f6922008-08-28 10:03:26 +0800666 dock_lock(ds, 0);
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800667 eject_dock(ds);
668 if (dock_present(ds)) {
669 printk(KERN_ERR PREFIX "Unable to undock!\n");
670 return -EBUSY;
671 }
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700672 complete_undock(ds);
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800673 return 0;
674}
675
676/**
Len Brownc8f7a622006-07-09 17:22:28 -0400677 * dock_notify - act upon an acpi dock notification
678 * @handle: the dock station handle
679 * @event: the acpi event
680 * @data: our driver data struct
681 *
682 * If we are notified to dock, then check to see if the dock is
683 * present and then dock. Notify all drivers of the dock event,
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800684 * and then hotplug and devices that may need hotplugging.
Len Brownc8f7a622006-07-09 17:22:28 -0400685 */
686static void dock_notify(acpi_handle handle, u32 event, void *data)
687{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200688 struct dock_station *ds = data;
Shaohua Li8b595602008-08-28 10:02:03 +0800689 struct acpi_device *tmp;
Shaohua Lidb350b02008-08-28 10:03:58 +0800690 int surprise_removal = 0;
Len Brownc8f7a622006-07-09 17:22:28 -0400691
Shaohua Lidb350b02008-08-28 10:03:58 +0800692 /*
693 * According to acpi spec 3.0a, if a DEVICE_CHECK notification
694 * is sent and _DCK is present, it is assumed to mean an undock
695 * request.
696 */
697 if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK)
698 event = ACPI_NOTIFY_EJECT_REQUEST;
699
700 /*
701 * dock station: BUS_CHECK - docked or surprise removal
702 * DEVICE_CHECK - undocked
703 * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal
704 *
705 * To simplify event handling, dock dependent device handler always
706 * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
707 * ACPI_NOTIFY_EJECT_REQUEST for removal
708 */
Len Brownc8f7a622006-07-09 17:22:28 -0400709 switch (event) {
710 case ACPI_NOTIFY_BUS_CHECK:
Shaohua Lidb350b02008-08-28 10:03:58 +0800711 case ACPI_NOTIFY_DEVICE_CHECK:
Shaohua Li8b595602008-08-28 10:02:03 +0800712 if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
713 &tmp)) {
Len Brownc8f7a622006-07-09 17:22:28 -0400714 begin_dock(ds);
715 dock(ds);
716 if (!dock_present(ds)) {
717 printk(KERN_ERR PREFIX "Unable to dock!\n");
Shaohua Li8b595602008-08-28 10:02:03 +0800718 complete_dock(ds);
Len Brownc8f7a622006-07-09 17:22:28 -0400719 break;
720 }
721 atomic_notifier_call_chain(&dock_notifier_list,
722 event, NULL);
723 hotplug_dock_devices(ds, event);
724 complete_dock(ds);
725 dock_event(ds, event, DOCK_EVENT);
Shaohua Li406f6922008-08-28 10:03:26 +0800726 dock_lock(ds, 1);
Shaohua Lidb350b02008-08-28 10:03:58 +0800727 break;
Len Brownc8f7a622006-07-09 17:22:28 -0400728 }
Shaohua Lidb350b02008-08-28 10:03:58 +0800729 if (dock_present(ds) || dock_in_progress(ds))
730 break;
731 /* This is a surprise removal */
732 surprise_removal = 1;
733 event = ACPI_NOTIFY_EJECT_REQUEST;
734 /* Fall back */
Len Brownc8f7a622006-07-09 17:22:28 -0400735 case ACPI_NOTIFY_EJECT_REQUEST:
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700736 begin_undock(ds);
Shaohua Lif730ae12008-08-28 10:05:45 +0800737 if ((immediate_undock && !(ds->flags & DOCK_IS_ATA))
738 || surprise_removal)
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700739 handle_eject_request(ds, event);
740 else
741 dock_event(ds, event, UNDOCK_EVENT);
Len Brownc8f7a622006-07-09 17:22:28 -0400742 break;
743 default:
744 printk(KERN_ERR PREFIX "Unknown dock event %d\n", event);
745 }
746}
747
Zhang Rui19cd8472008-08-28 10:05:06 +0800748struct dock_data {
749 acpi_handle handle;
750 unsigned long event;
751 struct dock_station *ds;
752};
753
754static void acpi_dock_deferred_cb(void *context)
755{
Alex Chiang747479a2009-10-19 15:14:50 -0600756 struct dock_data *data = context;
Zhang Rui19cd8472008-08-28 10:05:06 +0800757
758 dock_notify(data->handle, data->event, data->ds);
759 kfree(data);
760}
761
Shaohua Li6bd00a62008-08-28 10:04:29 +0800762static int acpi_dock_notifier_call(struct notifier_block *this,
763 unsigned long event, void *data)
764{
765 struct dock_station *dock_station;
Alex Chiang747479a2009-10-19 15:14:50 -0600766 acpi_handle handle = data;
Shaohua Li6bd00a62008-08-28 10:04:29 +0800767
768 if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
769 && event != ACPI_NOTIFY_EJECT_REQUEST)
770 return 0;
Alex Chiang50d716e2009-10-01 11:59:23 -0600771 list_for_each_entry(dock_station, &dock_stations, sibling) {
Shaohua Li6bd00a62008-08-28 10:04:29 +0800772 if (dock_station->handle == handle) {
Alex Chiang747479a2009-10-19 15:14:50 -0600773 struct dock_data *dd;
Zhang Rui19cd8472008-08-28 10:05:06 +0800774
Alex Chiang747479a2009-10-19 15:14:50 -0600775 dd = kmalloc(sizeof(*dd), GFP_KERNEL);
776 if (!dd)
Zhang Rui19cd8472008-08-28 10:05:06 +0800777 return 0;
Alex Chiang747479a2009-10-19 15:14:50 -0600778 dd->handle = handle;
779 dd->event = event;
780 dd->ds = dock_station;
781 acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd);
Shaohua Li6bd00a62008-08-28 10:04:29 +0800782 return 0 ;
783 }
784 }
785 return 0;
786}
787
788static struct notifier_block dock_acpi_notifier = {
789 .notifier_call = acpi_dock_notifier_call,
790};
791
Len Brownc8f7a622006-07-09 17:22:28 -0400792/**
793 * find_dock_devices - find devices on the dock station
794 * @handle: the handle of the device we are examining
795 * @lvl: unused
796 * @context: the dock station private data
797 * @rv: unused
798 *
799 * This function is called by acpi_walk_namespace. It will
800 * check to see if an object has an _EJD method. If it does, then it
801 * will see if it is dependent on the dock station.
802 */
803static acpi_status
804find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv)
805{
806 acpi_status status;
Kristen Carlson Accardife9a2f72007-02-02 22:33:00 -0500807 acpi_handle tmp, parent;
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200808 struct dock_station *ds = context;
Len Brownc8f7a622006-07-09 17:22:28 -0400809
810 status = acpi_bus_get_ejd(handle, &tmp);
Kristen Carlson Accardife9a2f72007-02-02 22:33:00 -0500811 if (ACPI_FAILURE(status)) {
812 /* try the parent device as well */
813 status = acpi_get_parent(handle, &parent);
814 if (ACPI_FAILURE(status))
815 goto fdd_out;
816 /* see if parent is dependent on dock */
817 status = acpi_bus_get_ejd(parent, &tmp);
818 if (ACPI_FAILURE(status))
819 goto fdd_out;
820 }
Len Brownc8f7a622006-07-09 17:22:28 -0400821
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600822 if (tmp == ds->handle)
823 add_dock_dependent_device(ds, handle);
824
Kristen Carlson Accardife9a2f72007-02-02 22:33:00 -0500825fdd_out:
Len Brownc8f7a622006-07-09 17:22:28 -0400826 return AE_OK;
827}
828
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800829/*
830 * show_docked - read method for "docked" file in sysfs
831 */
832static ssize_t show_docked(struct device *dev,
833 struct device_attribute *attr, char *buf)
834{
Holger Machtfc5a9f82009-01-20 12:18:24 +0100835 struct acpi_device *tmp;
836
Alex Chiangfe06fba2009-10-19 15:14:45 -0600837 struct dock_station *dock_station = dev->platform_data;
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800838
Holger Machtfc5a9f82009-01-20 12:18:24 +0100839 if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp)))
840 return snprintf(buf, PAGE_SIZE, "1\n");
841 return snprintf(buf, PAGE_SIZE, "0\n");
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800842}
Adrian Bunke5685b92007-10-24 18:24:42 +0200843static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800844
845/*
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700846 * show_flags - read method for flags file in sysfs
847 */
848static ssize_t show_flags(struct device *dev,
849 struct device_attribute *attr, char *buf)
850{
Alex Chiangfe06fba2009-10-19 15:14:45 -0600851 struct dock_station *dock_station = dev->platform_data;
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700852 return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
853
854}
Adrian Bunke5685b92007-10-24 18:24:42 +0200855static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700856
857/*
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800858 * write_undock - write method for "undock" file in sysfs
859 */
860static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
861 const char *buf, size_t count)
862{
863 int ret;
Alex Chiangfe06fba2009-10-19 15:14:45 -0600864 struct dock_station *dock_station = dev->platform_data;
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800865
866 if (!count)
867 return -EINVAL;
868
Holger Macht9171f832008-03-12 01:07:27 +0100869 begin_undock(dock_station);
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800870 ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
871 return ret ? ret: count;
872}
Adrian Bunke5685b92007-10-24 18:24:42 +0200873static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
brandon@ifup.orgc80fdbe2006-12-04 14:49:58 -0800874
Ilya A. Volynets-Evenbakhac122bb2007-02-19 15:19:31 -0800875/*
876 * show_dock_uid - read method for "uid" file in sysfs
877 */
878static ssize_t show_dock_uid(struct device *dev,
879 struct device_attribute *attr, char *buf)
880{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400881 unsigned long long lbuf;
Alex Chiangfe06fba2009-10-19 15:14:45 -0600882 struct dock_station *dock_station = dev->platform_data;
Kristen Carlson Accardi38ff4ff2007-05-09 15:04:24 -0700883 acpi_status status = acpi_evaluate_integer(dock_station->handle,
884 "_UID", NULL, &lbuf);
885 if (ACPI_FAILURE(status))
Ilya A. Volynets-Evenbakhac122bb2007-02-19 15:19:31 -0800886 return 0;
Kristen Carlson Accardi38ff4ff2007-05-09 15:04:24 -0700887
Matthew Wilcox27663c52008-10-10 02:22:59 -0400888 return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf);
Ilya A. Volynets-Evenbakhac122bb2007-02-19 15:19:31 -0800889}
Adrian Bunke5685b92007-10-24 18:24:42 +0200890static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
Ilya A. Volynets-Evenbakhac122bb2007-02-19 15:19:31 -0800891
Shaohua Li8652b002008-08-28 10:07:45 +0800892static ssize_t show_dock_type(struct device *dev,
893 struct device_attribute *attr, char *buf)
894{
Alex Chiangfe06fba2009-10-19 15:14:45 -0600895 struct dock_station *dock_station = dev->platform_data;
Shaohua Li8652b002008-08-28 10:07:45 +0800896 char *type;
897
898 if (dock_station->flags & DOCK_IS_DOCK)
899 type = "dock_station";
900 else if (dock_station->flags & DOCK_IS_ATA)
901 type = "ata_bay";
902 else if (dock_station->flags & DOCK_IS_BAT)
903 type = "battery_bay";
904 else
905 type = "unknown";
906
907 return snprintf(buf, PAGE_SIZE, "%s\n", type);
908}
909static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL);
910
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600911static struct attribute *dock_attributes[] = {
912 &dev_attr_docked.attr,
913 &dev_attr_flags.attr,
914 &dev_attr_undock.attr,
915 &dev_attr_uid.attr,
916 &dev_attr_type.attr,
917 NULL
918};
919
920static struct attribute_group dock_attribute_group = {
921 .attrs = dock_attributes
922};
923
Len Brownc8f7a622006-07-09 17:22:28 -0400924/**
925 * dock_add - add a new dock station
926 * @handle: the dock station handle
927 *
928 * allocated and initialize a new dock station device. Find all devices
929 * that are on the dock station, and register for dock event notifications.
930 */
931static int dock_add(acpi_handle handle)
932{
Alex Chiangfe06fba2009-10-19 15:14:45 -0600933 int ret, id;
934 struct dock_station ds, *dock_station;
Alex Chiang747479a2009-10-19 15:14:50 -0600935 struct platform_device *dd;
Len Brownc8f7a622006-07-09 17:22:28 -0400936
Alex Chiangfe06fba2009-10-19 15:14:45 -0600937 id = dock_station_count;
Alex Chiang49c6fb22010-02-01 10:35:18 -0700938 memset(&ds, 0, sizeof(ds));
Alex Chiang747479a2009-10-19 15:14:50 -0600939 dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds));
940 if (IS_ERR(dd))
941 return PTR_ERR(dd);
Alex Chiang9751cb72009-10-19 15:14:40 -0600942
Alex Chiang747479a2009-10-19 15:14:50 -0600943 dock_station = dd->dev.platform_data;
944
Len Brownc8f7a622006-07-09 17:22:28 -0400945 dock_station->handle = handle;
Alex Chiang747479a2009-10-19 15:14:50 -0600946 dock_station->dock_device = dd;
Len Brownc8f7a622006-07-09 17:22:28 -0400947 dock_station->last_dock_time = jiffies - HZ;
Len Brownc8f7a622006-07-09 17:22:28 -0400948
Len Brownc8f7a622006-07-09 17:22:28 -0400949 mutex_init(&dock_station->hp_lock);
Alex Chiang747479a2009-10-19 15:14:50 -0600950 spin_lock_init(&dock_station->dd_lock);
951 INIT_LIST_HEAD(&dock_station->sibling);
952 INIT_LIST_HEAD(&dock_station->hotplug_devices);
Len Brownc8f7a622006-07-09 17:22:28 -0400953 ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
Alex Chiang747479a2009-10-19 15:14:50 -0600954 INIT_LIST_HEAD(&dock_station->dependent_devices);
Kristen Carlson Accardia0cd35f2007-05-09 15:08:15 -0700955
Kristen Carlson Accardi9ef2a9a2007-05-09 15:09:12 -0700956 /* we want the dock device to send uevents */
Alex Chiang747479a2009-10-19 15:14:50 -0600957 dev_set_uevent_suppress(&dd->dev, 0);
Kristen Carlson Accardi9ef2a9a2007-05-09 15:09:12 -0700958
Shaohua Lidb350b02008-08-28 10:03:58 +0800959 if (is_dock(handle))
960 dock_station->flags |= DOCK_IS_DOCK;
961 if (is_ata(handle))
962 dock_station->flags |= DOCK_IS_ATA;
963 if (is_battery(handle))
964 dock_station->flags |= DOCK_IS_BAT;
965
Alex Chiang747479a2009-10-19 15:14:50 -0600966 ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group);
Shaohua Li8652b002008-08-28 10:07:45 +0800967 if (ret)
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600968 goto err_unregister;
Kristen Carlson Accardi671adbe2006-12-04 14:49:43 -0800969
Len Brownc8f7a622006-07-09 17:22:28 -0400970 /* Find dependent devices */
971 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +0800972 ACPI_UINT32_MAX, find_dock_devices, NULL,
973 dock_station, NULL);
Len Brownc8f7a622006-07-09 17:22:28 -0400974
975 /* add the dock station as a device dependent on itself */
Alex Chiangf69cfdd2009-10-19 15:14:29 -0600976 ret = add_dock_dependent_device(dock_station, handle);
977 if (ret)
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600978 goto err_rmgroup;
Len Brownc8f7a622006-07-09 17:22:28 -0400979
Shaohua Lidb350b02008-08-28 10:03:58 +0800980 dock_station_count++;
Alex Chiang50d716e2009-10-01 11:59:23 -0600981 list_add(&dock_station->sibling, &dock_stations);
Len Brownc8f7a622006-07-09 17:22:28 -0400982 return 0;
983
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600984err_rmgroup:
Alex Chiang747479a2009-10-19 15:14:50 -0600985 sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group);
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600986err_unregister:
Alex Chiang747479a2009-10-19 15:14:50 -0600987 platform_device_unregister(dd);
Alex Chiang5f46c2f2009-10-19 15:14:24 -0600988 printk(KERN_ERR "%s encountered error %d\n", __func__, ret);
Len Brownc8f7a622006-07-09 17:22:28 -0400989 return ret;
990}
991
992/**
993 * dock_remove - free up resources related to the dock station
994 */
Alex Chiang747479a2009-10-19 15:14:50 -0600995static int dock_remove(struct dock_station *ds)
Len Brownc8f7a622006-07-09 17:22:28 -0400996{
997 struct dock_dependent_device *dd, *tmp;
Alex Chiang747479a2009-10-19 15:14:50 -0600998 struct platform_device *dock_device = ds->dock_device;
Len Brownc8f7a622006-07-09 17:22:28 -0400999
Shaohua Lidb350b02008-08-28 10:03:58 +08001000 if (!dock_station_count)
Len Brownc8f7a622006-07-09 17:22:28 -04001001 return 0;
1002
1003 /* remove dependent devices */
Alex Chiang747479a2009-10-19 15:14:50 -06001004 list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list)
1005 kfree(dd);
Len Brownc8f7a622006-07-09 17:22:28 -04001006
Alex Chiang747479a2009-10-19 15:14:50 -06001007 list_del(&ds->sibling);
Len Brownc8f7a622006-07-09 17:22:28 -04001008
Kristen Carlson Accardi671adbe2006-12-04 14:49:43 -08001009 /* cleanup sysfs */
Alex Chiang5f46c2f2009-10-19 15:14:24 -06001010 sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
Kristen Carlson Accardi0f6f2802007-05-09 15:07:04 -07001011 platform_device_unregister(dock_device);
Kristen Carlson Accardi671adbe2006-12-04 14:49:43 -08001012
Len Brownc8f7a622006-07-09 17:22:28 -04001013 return 0;
1014}
1015
1016/**
1017 * find_dock - look for a dock station
1018 * @handle: acpi handle of a device
1019 * @lvl: unused
1020 * @context: counter of dock stations found
1021 * @rv: unused
1022 *
1023 * This is called by acpi_walk_namespace to look for dock stations.
1024 */
1025static acpi_status
1026find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
1027{
Len Brownc8f7a622006-07-09 17:22:28 -04001028 acpi_status status = AE_OK;
1029
Alex Chiang747479a2009-10-19 15:14:50 -06001030 if (is_dock(handle))
1031 if (dock_add(handle) >= 0)
Len Brownc8f7a622006-07-09 17:22:28 -04001032 status = AE_CTRL_TERMINATE;
Alex Chiang747479a2009-10-19 15:14:50 -06001033
Len Brownc8f7a622006-07-09 17:22:28 -04001034 return status;
1035}
1036
Shaohua Lidb350b02008-08-28 10:03:58 +08001037static acpi_status
1038find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
1039{
Shaohua Li61b83692008-08-28 10:07:14 +08001040 /* If bay is a dock, it's already handled */
1041 if (is_ejectable_bay(handle) && !is_dock(handle))
Shaohua Lidb350b02008-08-28 10:03:58 +08001042 dock_add(handle);
1043 return AE_OK;
1044}
1045
Len Brownc8f7a622006-07-09 17:22:28 -04001046static int __init dock_init(void)
1047{
Len Brown816c2ed2008-06-24 22:57:12 -04001048 if (acpi_disabled)
1049 return 0;
1050
Len Brownc8f7a622006-07-09 17:22:28 -04001051 /* look for a dock station */
1052 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +08001053 ACPI_UINT32_MAX, find_dock, NULL, NULL, NULL);
Len Brownc8f7a622006-07-09 17:22:28 -04001054
Shaohua Lidb350b02008-08-28 10:03:58 +08001055 /* look for bay */
1056 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +08001057 ACPI_UINT32_MAX, find_bay, NULL, NULL, NULL);
Shaohua Lidb350b02008-08-28 10:03:58 +08001058 if (!dock_station_count) {
1059 printk(KERN_INFO PREFIX "No dock devices found.\n");
1060 return 0;
1061 }
Len Brownc8f7a622006-07-09 17:22:28 -04001062
Shaohua Li6bd00a62008-08-28 10:04:29 +08001063 register_acpi_bus_notifier(&dock_acpi_notifier);
Shaohua Lidb350b02008-08-28 10:03:58 +08001064 printk(KERN_INFO PREFIX "%s: %d docks/bays found\n",
1065 ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
Len Brownc8f7a622006-07-09 17:22:28 -04001066 return 0;
1067}
1068
1069static void __exit dock_exit(void)
1070{
Alex Chiang747479a2009-10-19 15:14:50 -06001071 struct dock_station *tmp, *dock_station;
Shaohua Lidb350b02008-08-28 10:03:58 +08001072
Shaohua Li6bd00a62008-08-28 10:04:29 +08001073 unregister_acpi_bus_notifier(&dock_acpi_notifier);
Alex Chiang50d716e2009-10-01 11:59:23 -06001074 list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling)
Shaohua Lidb350b02008-08-28 10:03:58 +08001075 dock_remove(dock_station);
Len Brownc8f7a622006-07-09 17:22:28 -04001076}
1077
Shaohua Lidb350b02008-08-28 10:03:58 +08001078/*
1079 * Must be called before drivers of devices in dock, otherwise we can't know
1080 * which devices are in a dock
1081 */
1082subsys_initcall(dock_init);
Len Brownc8f7a622006-07-09 17:22:28 -04001083module_exit(dock_exit);