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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/slab.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/notifier.h>
31#include <linux/platform_device.h>
32#include <linux/jiffies.h>
33#include <linux/stddef.h>
34#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36
37#define PREFIX "ACPI: "
38
39#define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver"
40
41ACPI_MODULE_NAME("dock");
42MODULE_AUTHOR("Kristen Carlson Accardi");
43MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION);
44MODULE_LICENSE("GPL");
45
46static bool immediate_undock = 1;
47module_param(immediate_undock, bool, 0644);
48MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
49 "undock immediately when the undock button is pressed, 0 will cause"
50 " the driver to wait for userspace to write the undock sysfs file "
51 " before undocking");
52
53static struct atomic_notifier_head dock_notifier_list;
54
55static const struct acpi_device_id dock_device_ids[] = {
56 {"LNXDOCK", 0},
57 {"", 0},
58};
59MODULE_DEVICE_TABLE(acpi, dock_device_ids);
60
61struct dock_station {
62 acpi_handle handle;
63 unsigned long last_dock_time;
64 u32 flags;
65 spinlock_t dd_lock;
66 struct mutex hp_lock;
67 struct list_head dependent_devices;
68 struct list_head hotplug_devices;
69
70 struct list_head sibling;
71 struct platform_device *dock_device;
72};
73static LIST_HEAD(dock_stations);
74static int dock_station_count;
75
76struct dock_dependent_device {
77 struct list_head list;
78 struct list_head hotplug_list;
79 acpi_handle handle;
80 const struct acpi_dock_ops *ops;
81 void *context;
82};
83
84#define DOCK_DOCKING 0x00000001
85#define DOCK_UNDOCKING 0x00000002
86#define DOCK_IS_DOCK 0x00000010
87#define DOCK_IS_ATA 0x00000020
88#define DOCK_IS_BAT 0x00000040
89#define DOCK_EVENT 3
90#define UNDOCK_EVENT 2
91
92/*****************************************************************************
93 * Dock Dependent device functions *
94 *****************************************************************************/
95/**
96 * add_dock_dependent_device - associate a device with the dock station
97 * @ds: The dock station
98 * @handle: handle of the dependent device
99 *
100 * Add the dependent device to the dock's dependent device list.
101 */
102static int
103add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
104{
105 struct dock_dependent_device *dd;
106
107 dd = kzalloc(sizeof(*dd), GFP_KERNEL);
108 if (!dd)
109 return -ENOMEM;
110
111 dd->handle = handle;
112 INIT_LIST_HEAD(&dd->list);
113 INIT_LIST_HEAD(&dd->hotplug_list);
114
115 spin_lock(&ds->dd_lock);
116 list_add_tail(&dd->list, &ds->dependent_devices);
117 spin_unlock(&ds->dd_lock);
118
119 return 0;
120}
121
122/**
123 * dock_add_hotplug_device - associate a hotplug handler with the dock station
124 * @ds: The dock station
125 * @dd: The dependent device struct
126 *
127 * Add the dependent device to the dock's hotplug device list
128 */
129static void
130dock_add_hotplug_device(struct dock_station *ds,
131 struct dock_dependent_device *dd)
132{
133 mutex_lock(&ds->hp_lock);
134 list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
135 mutex_unlock(&ds->hp_lock);
136}
137
138/**
139 * dock_del_hotplug_device - remove a hotplug handler from the dock station
140 * @ds: The dock station
141 * @dd: the dependent device struct
142 *
143 * Delete the dependent device from the dock's hotplug device list
144 */
145static void
146dock_del_hotplug_device(struct dock_station *ds,
147 struct dock_dependent_device *dd)
148{
149 mutex_lock(&ds->hp_lock);
150 list_del(&dd->hotplug_list);
151 mutex_unlock(&ds->hp_lock);
152}
153
154/**
155 * find_dock_dependent_device - get a device dependent on this dock
156 * @ds: the dock station
157 * @handle: the acpi_handle of the device we want
158 *
159 * iterate over the dependent device list for this dock. If the
160 * dependent device matches the handle, return.
161 */
162static struct dock_dependent_device *
163find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
164{
165 struct dock_dependent_device *dd;
166
167 spin_lock(&ds->dd_lock);
168 list_for_each_entry(dd, &ds->dependent_devices, list) {
169 if (handle == dd->handle) {
170 spin_unlock(&ds->dd_lock);
171 return dd;
172 }
173 }
174 spin_unlock(&ds->dd_lock);
175 return NULL;
176}
177
178/*****************************************************************************
179 * Dock functions *
180 *****************************************************************************/
181/**
182 * is_dock - see if a device is a dock station
183 * @handle: acpi handle of the device
184 *
185 * If an acpi object has a _DCK method, then it is by definition a dock
186 * station, so return true.
187 */
188static int is_dock(acpi_handle handle)
189{
190 acpi_status status;
191 acpi_handle tmp;
192
193 status = acpi_get_handle(handle, "_DCK", &tmp);
194 if (ACPI_FAILURE(status))
195 return 0;
196 return 1;
197}
198
199static int is_ejectable(acpi_handle handle)
200{
201 acpi_status status;
202 acpi_handle tmp;
203
204 status = acpi_get_handle(handle, "_EJ0", &tmp);
205 if (ACPI_FAILURE(status))
206 return 0;
207 return 1;
208}
209
210static int is_ata(acpi_handle handle)
211{
212 acpi_handle tmp;
213
214 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
215 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
216 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
217 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
218 return 1;
219
220 return 0;
221}
222
223static int is_battery(acpi_handle handle)
224{
225 struct acpi_device_info *info;
226 int ret = 1;
227
228 if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info)))
229 return 0;
230 if (!(info->valid & ACPI_VALID_HID))
231 ret = 0;
232 else
233 ret = !strcmp("PNP0C0A", info->hardware_id.string);
234
235 kfree(info);
236 return ret;
237}
238
239static int is_ejectable_bay(acpi_handle handle)
240{
241 acpi_handle phandle;
242
243 if (!is_ejectable(handle))
244 return 0;
245 if (is_battery(handle) || is_ata(handle))
246 return 1;
247 if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
248 return 1;
249 return 0;
250}
251
252/**
253 * is_dock_device - see if a device is on a dock station
254 * @handle: acpi handle of the device
255 *
256 * If this device is either the dock station itself,
257 * or is a device dependent on the dock station, then it
258 * is a dock device
259 */
260int is_dock_device(acpi_handle handle)
261{
262 struct dock_station *dock_station;
263
264 if (!dock_station_count)
265 return 0;
266
267 if (is_dock(handle))
268 return 1;
269
270 list_for_each_entry(dock_station, &dock_stations, sibling)
271 if (find_dock_dependent_device(dock_station, handle))
272 return 1;
273
274 return 0;
275}
276EXPORT_SYMBOL_GPL(is_dock_device);
277
278/**
279 * dock_present - see if the dock station is present.
280 * @ds: the dock station
281 *
282 * execute the _STA method. note that present does not
283 * imply that we are docked.
284 */
285static int dock_present(struct dock_station *ds)
286{
287 unsigned long long sta;
288 acpi_status status;
289
290 if (ds) {
291 status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta);
292 if (ACPI_SUCCESS(status) && sta)
293 return 1;
294 }
295 return 0;
296}
297
298/**
299 * dock_create_acpi_device - add new devices to acpi
300 * @handle - handle of the device to add
301 *
302 * This function will create a new acpi_device for the given
303 * handle if one does not exist already. This should cause
304 * acpi to scan for drivers for the given devices, and call
305 * matching driver's add routine.
306 *
307 * Returns a pointer to the acpi_device corresponding to the handle.
308 */
309static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
310{
311 struct acpi_device *device;
312 struct acpi_device *parent_device;
313 acpi_handle parent;
314 int ret;
315
316 if (acpi_bus_get_device(handle, &device)) {
317 /*
318 * no device created for this object,
319 * so we should create one.
320 */
321 acpi_get_parent(handle, &parent);
322 if (acpi_bus_get_device(parent, &parent_device))
323 parent_device = NULL;
324
325 ret = acpi_bus_add(&device, parent_device, handle,
326 ACPI_BUS_TYPE_DEVICE);
327 if (ret) {
328 pr_debug("error adding bus, %x\n", -ret);
329 return NULL;
330 }
331 }
332 return device;
333}
334
335/**
336 * dock_remove_acpi_device - remove the acpi_device struct from acpi
337 * @handle - the handle of the device to remove
338 *
339 * Tell acpi to remove the acpi_device. This should cause any loaded
340 * driver to have it's remove routine called.
341 */
342static void dock_remove_acpi_device(acpi_handle handle)
343{
344 struct acpi_device *device;
345 int ret;
346
347 if (!acpi_bus_get_device(handle, &device)) {
348 ret = acpi_bus_trim(device, 1);
349 if (ret)
350 pr_debug("error removing bus, %x\n", -ret);
351 }
352}
353
354/**
355 * hotplug_dock_devices - insert or remove devices on the dock station
356 * @ds: the dock station
357 * @event: either bus check or eject request
358 *
359 * Some devices on the dock station need to have drivers called
360 * to perform hotplug operations after a dock event has occurred.
361 * Traverse the list of dock devices that have registered a
362 * hotplug handler, and call the handler.
363 */
364static void hotplug_dock_devices(struct dock_station *ds, u32 event)
365{
366 struct dock_dependent_device *dd;
367
368 mutex_lock(&ds->hp_lock);
369
370 /*
371 * First call driver specific hotplug functions
372 */
373 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
374 if (dd->ops && dd->ops->handler)
375 dd->ops->handler(dd->handle, event, dd->context);
376
377 /*
378 * Now make sure that an acpi_device is created for each
379 * dependent device, or removed if this is an eject request.
380 * This will cause acpi_drivers to be stopped/started if they
381 * exist
382 */
383 list_for_each_entry(dd, &ds->dependent_devices, list) {
384 if (event == ACPI_NOTIFY_EJECT_REQUEST)
385 dock_remove_acpi_device(dd->handle);
386 else
387 dock_create_acpi_device(dd->handle);
388 }
389 mutex_unlock(&ds->hp_lock);
390}
391
392static void dock_event(struct dock_station *ds, u32 event, int num)
393{
394 struct device *dev = &ds->dock_device->dev;
395 char event_string[13];
396 char *envp[] = { event_string, NULL };
397 struct dock_dependent_device *dd;
398
399 if (num == UNDOCK_EVENT)
400 sprintf(event_string, "EVENT=undock");
401 else
402 sprintf(event_string, "EVENT=dock");
403
404 /*
405 * Indicate that the status of the dock station has
406 * changed.
407 */
408 if (num == DOCK_EVENT)
409 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
410
411 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
412 if (dd->ops && dd->ops->uevent)
413 dd->ops->uevent(dd->handle, event, dd->context);
414
415 if (num != DOCK_EVENT)
416 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
417}
418
419/**
420 * eject_dock - respond to a dock eject request
421 * @ds: the dock station
422 *
423 * This is called after _DCK is called, to execute the dock station's
424 * _EJ0 method.
425 */
426static void eject_dock(struct dock_station *ds)
427{
428 struct acpi_object_list arg_list;
429 union acpi_object arg;
430 acpi_status status;
431 acpi_handle tmp;
432
433 /* all dock devices should have _EJ0, but check anyway */
434 status = acpi_get_handle(ds->handle, "_EJ0", &tmp);
435 if (ACPI_FAILURE(status)) {
436 pr_debug("No _EJ0 support for dock device\n");
437 return;
438 }
439
440 arg_list.count = 1;
441 arg_list.pointer = &arg;
442 arg.type = ACPI_TYPE_INTEGER;
443 arg.integer.value = 1;
444
445 status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL);
446 if (ACPI_FAILURE(status))
447 pr_debug("Failed to evaluate _EJ0!\n");
448}
449
450/**
451 * handle_dock - handle a dock event
452 * @ds: the dock station
453 * @dock: to dock, or undock - that is the question
454 *
455 * Execute the _DCK method in response to an acpi event
456 */
457static void handle_dock(struct dock_station *ds, int dock)
458{
459 acpi_status status;
460 struct acpi_object_list arg_list;
461 union acpi_object arg;
462 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
463 struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
464
465 acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer);
466
467 printk(KERN_INFO PREFIX "%s - %s\n",
468 (char *)name_buffer.pointer, dock ? "docking" : "undocking");
469
470 /* _DCK method has one argument */
471 arg_list.count = 1;
472 arg_list.pointer = &arg;
473 arg.type = ACPI_TYPE_INTEGER;
474 arg.integer.value = dock;
475 status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
476 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
477 ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute"
478 " _DCK\n", (char *)name_buffer.pointer));
479
480 kfree(buffer.pointer);
481 kfree(name_buffer.pointer);
482}
483
484static inline void dock(struct dock_station *ds)
485{
486 handle_dock(ds, 1);
487}
488
489static inline void undock(struct dock_station *ds)
490{
491 handle_dock(ds, 0);
492}
493
494static inline void begin_dock(struct dock_station *ds)
495{
496 ds->flags |= DOCK_DOCKING;
497}
498
499static inline void complete_dock(struct dock_station *ds)
500{
501 ds->flags &= ~(DOCK_DOCKING);
502 ds->last_dock_time = jiffies;
503}
504
505static inline void begin_undock(struct dock_station *ds)
506{
507 ds->flags |= DOCK_UNDOCKING;
508}
509
510static inline void complete_undock(struct dock_station *ds)
511{
512 ds->flags &= ~(DOCK_UNDOCKING);
513}
514
515static void dock_lock(struct dock_station *ds, int lock)
516{
517 struct acpi_object_list arg_list;
518 union acpi_object arg;
519 acpi_status status;
520
521 arg_list.count = 1;
522 arg_list.pointer = &arg;
523 arg.type = ACPI_TYPE_INTEGER;
524 arg.integer.value = !!lock;
525 status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
526 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
527 if (lock)
528 printk(KERN_WARNING PREFIX "Locking device failed\n");
529 else
530 printk(KERN_WARNING PREFIX "Unlocking device failed\n");
531 }
532}
533
534/**
535 * dock_in_progress - see if we are in the middle of handling a dock event
536 * @ds: the dock station
537 *
538 * Sometimes while docking, false dock events can be sent to the driver
539 * because good connections aren't made or some other reason. Ignore these
540 * if we are in the middle of doing something.
541 */
542static int dock_in_progress(struct dock_station *ds)
543{
544 if ((ds->flags & DOCK_DOCKING) ||
545 time_before(jiffies, (ds->last_dock_time + HZ)))
546 return 1;
547 return 0;
548}
549
550/**
551 * register_dock_notifier - add yourself to the dock notifier list
552 * @nb: the callers notifier block
553 *
554 * If a driver wishes to be notified about dock events, they can
555 * use this function to put a notifier block on the dock notifier list.
556 * this notifier call chain will be called after a dock event, but
557 * before hotplugging any new devices.
558 */
559int register_dock_notifier(struct notifier_block *nb)
560{
561 if (!dock_station_count)
562 return -ENODEV;
563
564 return atomic_notifier_chain_register(&dock_notifier_list, nb);
565}
566EXPORT_SYMBOL_GPL(register_dock_notifier);
567
568/**
569 * unregister_dock_notifier - remove yourself from the dock notifier list
570 * @nb: the callers notifier block
571 */
572void unregister_dock_notifier(struct notifier_block *nb)
573{
574 if (!dock_station_count)
575 return;
576
577 atomic_notifier_chain_unregister(&dock_notifier_list, nb);
578}
579EXPORT_SYMBOL_GPL(unregister_dock_notifier);
580
581/**
582 * register_hotplug_dock_device - register a hotplug function
583 * @handle: the handle of the device
584 * @ops: handlers to call after docking
585 * @context: device specific data
586 *
587 * If a driver would like to perform a hotplug operation after a dock
588 * event, they can register an acpi_notifiy_handler to be called by
589 * the dock driver after _DCK is executed.
590 */
591int
592register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops,
593 void *context)
594{
595 struct dock_dependent_device *dd;
596 struct dock_station *dock_station;
597 int ret = -EINVAL;
598
599 if (!dock_station_count)
600 return -ENODEV;
601
602 /*
603 * make sure this handle is for a device dependent on the dock,
604 * this would include the dock station itself
605 */
606 list_for_each_entry(dock_station, &dock_stations, sibling) {
607 /*
608 * An ATA bay can be in a dock and itself can be ejected
609 * separately, so there are two 'dock stations' which need the
610 * ops
611 */
612 dd = find_dock_dependent_device(dock_station, handle);
613 if (dd) {
614 dd->ops = ops;
615 dd->context = context;
616 dock_add_hotplug_device(dock_station, dd);
617 ret = 0;
618 }
619 }
620
621 return ret;
622}
623EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
624
625/**
626 * unregister_hotplug_dock_device - remove yourself from the hotplug list
627 * @handle: the acpi handle of the device
628 */
629void unregister_hotplug_dock_device(acpi_handle handle)
630{
631 struct dock_dependent_device *dd;
632 struct dock_station *dock_station;
633
634 if (!dock_station_count)
635 return;
636
637 list_for_each_entry(dock_station, &dock_stations, sibling) {
638 dd = find_dock_dependent_device(dock_station, handle);
639 if (dd)
640 dock_del_hotplug_device(dock_station, dd);
641 }
642}
643EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
644
645/**
646 * handle_eject_request - handle an undock request checking for error conditions
647 *
648 * Check to make sure the dock device is still present, then undock and
649 * hotremove all the devices that may need removing.
650 */
651static int handle_eject_request(struct dock_station *ds, u32 event)
652{
653 if (dock_in_progress(ds))
654 return -EBUSY;
655
656 /*
657 * here we need to generate the undock
658 * event prior to actually doing the undock
659 * so that the device struct still exists.
660 * Also, even send the dock event if the
661 * device is not present anymore
662 */
663 dock_event(ds, event, UNDOCK_EVENT);
664
665 hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
666 undock(ds);
667 dock_lock(ds, 0);
668 eject_dock(ds);
669 if (dock_present(ds)) {
670 printk(KERN_ERR PREFIX "Unable to undock!\n");
671 return -EBUSY;
672 }
673 complete_undock(ds);
674 return 0;
675}
676
677/**
678 * dock_notify - act upon an acpi dock notification
679 * @handle: the dock station handle
680 * @event: the acpi event
681 * @data: our driver data struct
682 *
683 * If we are notified to dock, then check to see if the dock is
684 * present and then dock. Notify all drivers of the dock event,
685 * and then hotplug and devices that may need hotplugging.
686 */
687static void dock_notify(acpi_handle handle, u32 event, void *data)
688{
689 struct dock_station *ds = data;
690 struct acpi_device *tmp;
691 int surprise_removal = 0;
692
693 /*
694 * According to acpi spec 3.0a, if a DEVICE_CHECK notification
695 * is sent and _DCK is present, it is assumed to mean an undock
696 * request.
697 */
698 if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK)
699 event = ACPI_NOTIFY_EJECT_REQUEST;
700
701 /*
702 * dock station: BUS_CHECK - docked or surprise removal
703 * DEVICE_CHECK - undocked
704 * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal
705 *
706 * To simplify event handling, dock dependent device handler always
707 * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
708 * ACPI_NOTIFY_EJECT_REQUEST for removal
709 */
710 switch (event) {
711 case ACPI_NOTIFY_BUS_CHECK:
712 case ACPI_NOTIFY_DEVICE_CHECK:
713 if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
714 &tmp)) {
715 begin_dock(ds);
716 dock(ds);
717 if (!dock_present(ds)) {
718 printk(KERN_ERR PREFIX "Unable to dock!\n");
719 complete_dock(ds);
720 break;
721 }
722 atomic_notifier_call_chain(&dock_notifier_list,
723 event, NULL);
724 hotplug_dock_devices(ds, event);
725 complete_dock(ds);
726 dock_event(ds, event, DOCK_EVENT);
727 dock_lock(ds, 1);
728 acpi_update_all_gpes();
729 break;
730 }
731 if (dock_present(ds) || dock_in_progress(ds))
732 break;
733 /* This is a surprise removal */
734 surprise_removal = 1;
735 event = ACPI_NOTIFY_EJECT_REQUEST;
736 /* Fall back */
737 case ACPI_NOTIFY_EJECT_REQUEST:
738 begin_undock(ds);
739 if ((immediate_undock && !(ds->flags & DOCK_IS_ATA))
740 || surprise_removal)
741 handle_eject_request(ds, event);
742 else
743 dock_event(ds, event, UNDOCK_EVENT);
744 break;
745 default:
746 printk(KERN_ERR PREFIX "Unknown dock event %d\n", event);
747 }
748}
749
750struct dock_data {
751 acpi_handle handle;
752 unsigned long event;
753 struct dock_station *ds;
754};
755
756static void acpi_dock_deferred_cb(void *context)
757{
758 struct dock_data *data = context;
759
760 dock_notify(data->handle, data->event, data->ds);
761 kfree(data);
762}
763
764static int acpi_dock_notifier_call(struct notifier_block *this,
765 unsigned long event, void *data)
766{
767 struct dock_station *dock_station;
768 acpi_handle handle = data;
769
770 if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
771 && event != ACPI_NOTIFY_EJECT_REQUEST)
772 return 0;
773 list_for_each_entry(dock_station, &dock_stations, sibling) {
774 if (dock_station->handle == handle) {
775 struct dock_data *dd;
776
777 dd = kmalloc(sizeof(*dd), GFP_KERNEL);
778 if (!dd)
779 return 0;
780 dd->handle = handle;
781 dd->event = event;
782 dd->ds = dock_station;
783 acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd);
784 return 0 ;
785 }
786 }
787 return 0;
788}
789
790static struct notifier_block dock_acpi_notifier = {
791 .notifier_call = acpi_dock_notifier_call,
792};
793
794/**
795 * find_dock_devices - find devices on the dock station
796 * @handle: the handle of the device we are examining
797 * @lvl: unused
798 * @context: the dock station private data
799 * @rv: unused
800 *
801 * This function is called by acpi_walk_namespace. It will
802 * check to see if an object has an _EJD method. If it does, then it
803 * will see if it is dependent on the dock station.
804 */
805static acpi_status
806find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv)
807{
808 acpi_status status;
809 acpi_handle tmp, parent;
810 struct dock_station *ds = context;
811
812 status = acpi_bus_get_ejd(handle, &tmp);
813 if (ACPI_FAILURE(status)) {
814 /* try the parent device as well */
815 status = acpi_get_parent(handle, &parent);
816 if (ACPI_FAILURE(status))
817 goto fdd_out;
818 /* see if parent is dependent on dock */
819 status = acpi_bus_get_ejd(parent, &tmp);
820 if (ACPI_FAILURE(status))
821 goto fdd_out;
822 }
823
824 if (tmp == ds->handle)
825 add_dock_dependent_device(ds, handle);
826
827fdd_out:
828 return AE_OK;
829}
830
831/*
832 * show_docked - read method for "docked" file in sysfs
833 */
834static ssize_t show_docked(struct device *dev,
835 struct device_attribute *attr, char *buf)
836{
837 struct acpi_device *tmp;
838
839 struct dock_station *dock_station = dev->platform_data;
840
841 if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp)))
842 return snprintf(buf, PAGE_SIZE, "1\n");
843 return snprintf(buf, PAGE_SIZE, "0\n");
844}
845static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);
846
847/*
848 * show_flags - read method for flags file in sysfs
849 */
850static ssize_t show_flags(struct device *dev,
851 struct device_attribute *attr, char *buf)
852{
853 struct dock_station *dock_station = dev->platform_data;
854 return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
855
856}
857static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
858
859/*
860 * write_undock - write method for "undock" file in sysfs
861 */
862static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
863 const char *buf, size_t count)
864{
865 int ret;
866 struct dock_station *dock_station = dev->platform_data;
867
868 if (!count)
869 return -EINVAL;
870
871 begin_undock(dock_station);
872 ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
873 return ret ? ret: count;
874}
875static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
876
877/*
878 * show_dock_uid - read method for "uid" file in sysfs
879 */
880static ssize_t show_dock_uid(struct device *dev,
881 struct device_attribute *attr, char *buf)
882{
883 unsigned long long lbuf;
884 struct dock_station *dock_station = dev->platform_data;
885 acpi_status status = acpi_evaluate_integer(dock_station->handle,
886 "_UID", NULL, &lbuf);
887 if (ACPI_FAILURE(status))
888 return 0;
889
890 return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf);
891}
892static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
893
894static ssize_t show_dock_type(struct device *dev,
895 struct device_attribute *attr, char *buf)
896{
897 struct dock_station *dock_station = dev->platform_data;
898 char *type;
899
900 if (dock_station->flags & DOCK_IS_DOCK)
901 type = "dock_station";
902 else if (dock_station->flags & DOCK_IS_ATA)
903 type = "ata_bay";
904 else if (dock_station->flags & DOCK_IS_BAT)
905 type = "battery_bay";
906 else
907 type = "unknown";
908
909 return snprintf(buf, PAGE_SIZE, "%s\n", type);
910}
911static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL);
912
913static struct attribute *dock_attributes[] = {
914 &dev_attr_docked.attr,
915 &dev_attr_flags.attr,
916 &dev_attr_undock.attr,
917 &dev_attr_uid.attr,
918 &dev_attr_type.attr,
919 NULL
920};
921
922static struct attribute_group dock_attribute_group = {
923 .attrs = dock_attributes
924};
925
926/**
927 * dock_add - add a new dock station
928 * @handle: the dock station handle
929 *
930 * allocated and initialize a new dock station device. Find all devices
931 * that are on the dock station, and register for dock event notifications.
932 */
933static int __init dock_add(acpi_handle handle)
934{
935 int ret, id;
936 struct dock_station ds, *dock_station;
937 struct platform_device *dd;
938
939 id = dock_station_count;
940 memset(&ds, 0, sizeof(ds));
941 dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds));
942 if (IS_ERR(dd))
943 return PTR_ERR(dd);
944
945 dock_station = dd->dev.platform_data;
946
947 dock_station->handle = handle;
948 dock_station->dock_device = dd;
949 dock_station->last_dock_time = jiffies - HZ;
950
951 mutex_init(&dock_station->hp_lock);
952 spin_lock_init(&dock_station->dd_lock);
953 INIT_LIST_HEAD(&dock_station->sibling);
954 INIT_LIST_HEAD(&dock_station->hotplug_devices);
955 ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
956 INIT_LIST_HEAD(&dock_station->dependent_devices);
957
958 /* we want the dock device to send uevents */
959 dev_set_uevent_suppress(&dd->dev, 0);
960
961 if (is_dock(handle))
962 dock_station->flags |= DOCK_IS_DOCK;
963 if (is_ata(handle))
964 dock_station->flags |= DOCK_IS_ATA;
965 if (is_battery(handle))
966 dock_station->flags |= DOCK_IS_BAT;
967
968 ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group);
969 if (ret)
970 goto err_unregister;
971
972 /* Find dependent devices */
973 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
974 ACPI_UINT32_MAX, find_dock_devices, NULL,
975 dock_station, NULL);
976
977 /* add the dock station as a device dependent on itself */
978 ret = add_dock_dependent_device(dock_station, handle);
979 if (ret)
980 goto err_rmgroup;
981
982 dock_station_count++;
983 list_add(&dock_station->sibling, &dock_stations);
984 return 0;
985
986err_rmgroup:
987 sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group);
988err_unregister:
989 platform_device_unregister(dd);
990 printk(KERN_ERR "%s encountered error %d\n", __func__, ret);
991 return ret;
992}
993
994/**
995 * dock_remove - free up resources related to the dock station
996 */
997static int dock_remove(struct dock_station *ds)
998{
999 struct dock_dependent_device *dd, *tmp;
1000 struct platform_device *dock_device = ds->dock_device;
1001
1002 if (!dock_station_count)
1003 return 0;
1004
1005 /* remove dependent devices */
1006 list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list)
1007 kfree(dd);
1008
1009 list_del(&ds->sibling);
1010
1011 /* cleanup sysfs */
1012 sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
1013 platform_device_unregister(dock_device);
1014
1015 return 0;
1016}
1017
1018/**
1019 * find_dock - look for a dock station
1020 * @handle: acpi handle of a device
1021 * @lvl: unused
1022 * @context: counter of dock stations found
1023 * @rv: unused
1024 *
1025 * This is called by acpi_walk_namespace to look for dock stations.
1026 */
1027static __init acpi_status
1028find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
1029{
1030 if (is_dock(handle))
1031 dock_add(handle);
1032
1033 return AE_OK;
1034}
1035
1036static __init acpi_status
1037find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
1038{
1039 /* If bay is a dock, it's already handled */
1040 if (is_ejectable_bay(handle) && !is_dock(handle))
1041 dock_add(handle);
1042 return AE_OK;
1043}
1044
1045static int __init dock_init(void)
1046{
1047 if (acpi_disabled)
1048 return 0;
1049
1050 /* look for a dock station */
1051 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1052 ACPI_UINT32_MAX, find_dock, NULL, NULL, NULL);
1053
1054 /* look for bay */
1055 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1056 ACPI_UINT32_MAX, find_bay, NULL, NULL, NULL);
1057 if (!dock_station_count) {
1058 printk(KERN_INFO PREFIX "No dock devices found.\n");
1059 return 0;
1060 }
1061
1062 register_acpi_bus_notifier(&dock_acpi_notifier);
1063 printk(KERN_INFO PREFIX "%s: %d docks/bays found\n",
1064 ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
1065 return 0;
1066}
1067
1068static void __exit dock_exit(void)
1069{
1070 struct dock_station *tmp, *dock_station;
1071
1072 unregister_acpi_bus_notifier(&dock_acpi_notifier);
1073 list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling)
1074 dock_remove(dock_station);
1075}
1076
1077/*
1078 * Must be called before drivers of devices in dock, otherwise we can't know
1079 * which devices are in a dock
1080 */
1081subsys_initcall(dock_init);
1082module_exit(dock_exit);