2 * dock.c - ACPI dock station driver
4 * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
30 #include <linux/platform_device.h>
31 #include <linux/jiffies.h>
32 #include <linux/stddef.h>
33 #include <acpi/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
36 #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver"
38 ACPI_MODULE_NAME("dock");
39 MODULE_AUTHOR("Kristen Carlson Accardi");
40 MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION);
41 MODULE_LICENSE("GPL");
43 static int immediate_undock = 1;
44 module_param(immediate_undock, bool, 0644);
45 MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
46 "undock immediately when the undock button is pressed, 0 will cause"
47 " the driver to wait for userspace to write the undock sysfs file "
50 static struct atomic_notifier_head dock_notifier_list;
51 static char dock_device_name[] = "dock";
53 static const struct acpi_device_id dock_device_ids[] = {
57 MODULE_DEVICE_TABLE(acpi, dock_device_ids);
61 unsigned long last_dock_time;
65 struct list_head dependent_devices;
66 struct list_head hotplug_devices;
68 struct list_head sibiling;
69 struct platform_device *dock_device;
71 static LIST_HEAD(dock_stations);
72 static int dock_station_count;
74 struct dock_dependent_device {
75 struct list_head list;
76 struct list_head hotplug_list;
78 struct acpi_dock_ops *ops;
82 #define DOCK_DOCKING 0x00000001
83 #define DOCK_UNDOCKING 0x00000002
84 #define DOCK_IS_DOCK 0x00000010
85 #define DOCK_IS_ATA 0x00000020
86 #define DOCK_IS_BAT 0x00000040
88 #define UNDOCK_EVENT 2
90 /*****************************************************************************
91 * Dock Dependent device functions *
92 *****************************************************************************/
94 * alloc_dock_dependent_device - allocate and init a dependent device
95 * @handle: the acpi_handle of the dependent device
97 * Allocate memory for a dependent device structure for a device referenced
100 static struct dock_dependent_device *
101 alloc_dock_dependent_device(acpi_handle handle)
103 struct dock_dependent_device *dd;
105 dd = kzalloc(sizeof(*dd), GFP_KERNEL);
108 INIT_LIST_HEAD(&dd->list);
109 INIT_LIST_HEAD(&dd->hotplug_list);
115 * add_dock_dependent_device - associate a device with the dock station
116 * @ds: The dock station
117 * @dd: The dependent device
119 * Add the dependent device to the dock's dependent device list.
122 add_dock_dependent_device(struct dock_station *ds,
123 struct dock_dependent_device *dd)
125 spin_lock(&ds->dd_lock);
126 list_add_tail(&dd->list, &ds->dependent_devices);
127 spin_unlock(&ds->dd_lock);
131 * dock_add_hotplug_device - associate a hotplug handler with the dock station
132 * @ds: The dock station
133 * @dd: The dependent device struct
135 * Add the dependent device to the dock's hotplug device list
138 dock_add_hotplug_device(struct dock_station *ds,
139 struct dock_dependent_device *dd)
141 mutex_lock(&ds->hp_lock);
142 list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
143 mutex_unlock(&ds->hp_lock);
147 * dock_del_hotplug_device - remove a hotplug handler from the dock station
148 * @ds: The dock station
149 * @dd: the dependent device struct
151 * Delete the dependent device from the dock's hotplug device list
154 dock_del_hotplug_device(struct dock_station *ds,
155 struct dock_dependent_device *dd)
157 mutex_lock(&ds->hp_lock);
158 list_del(&dd->hotplug_list);
159 mutex_unlock(&ds->hp_lock);
163 * find_dock_dependent_device - get a device dependent on this dock
164 * @ds: the dock station
165 * @handle: the acpi_handle of the device we want
167 * iterate over the dependent device list for this dock. If the
168 * dependent device matches the handle, return.
170 static struct dock_dependent_device *
171 find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
173 struct dock_dependent_device *dd;
175 spin_lock(&ds->dd_lock);
176 list_for_each_entry(dd, &ds->dependent_devices, list) {
177 if (handle == dd->handle) {
178 spin_unlock(&ds->dd_lock);
182 spin_unlock(&ds->dd_lock);
186 /*****************************************************************************
188 *****************************************************************************/
190 * is_dock - see if a device is a dock station
191 * @handle: acpi handle of the device
193 * If an acpi object has a _DCK method, then it is by definition a dock
194 * station, so return true.
196 static int is_dock(acpi_handle handle)
201 status = acpi_get_handle(handle, "_DCK", &tmp);
202 if (ACPI_FAILURE(status))
207 static int is_ejectable(acpi_handle handle)
212 status = acpi_get_handle(handle, "_EJ0", &tmp);
213 if (ACPI_FAILURE(status))
218 static int is_ata(acpi_handle handle)
222 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
223 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
224 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
225 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
231 static int is_battery(acpi_handle handle)
233 struct acpi_device_info *info;
236 if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info)))
238 if (!(info->valid & ACPI_VALID_HID))
241 ret = !strcmp("PNP0C0A", info->hardware_id.string);
247 static int is_ejectable_bay(acpi_handle handle)
250 if (!is_ejectable(handle))
252 if (is_battery(handle) || is_ata(handle))
254 if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
260 * is_dock_device - see if a device is on a dock station
261 * @handle: acpi handle of the device
263 * If this device is either the dock station itself,
264 * or is a device dependent on the dock station, then it
267 int is_dock_device(acpi_handle handle)
269 struct dock_station *dock_station;
271 if (!dock_station_count)
276 list_for_each_entry(dock_station, &dock_stations, sibiling) {
277 if (find_dock_dependent_device(dock_station, handle))
284 EXPORT_SYMBOL_GPL(is_dock_device);
287 * dock_present - see if the dock station is present.
288 * @ds: the dock station
290 * execute the _STA method. note that present does not
291 * imply that we are docked.
293 static int dock_present(struct dock_station *ds)
295 unsigned long long sta;
299 status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta);
300 if (ACPI_SUCCESS(status) && sta)
309 * dock_create_acpi_device - add new devices to acpi
310 * @handle - handle of the device to add
312 * This function will create a new acpi_device for the given
313 * handle if one does not exist already. This should cause
314 * acpi to scan for drivers for the given devices, and call
315 * matching driver's add routine.
317 * Returns a pointer to the acpi_device corresponding to the handle.
319 static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
321 struct acpi_device *device = NULL;
322 struct acpi_device *parent_device;
326 if (acpi_bus_get_device(handle, &device)) {
328 * no device created for this object,
329 * so we should create one.
331 acpi_get_parent(handle, &parent);
332 if (acpi_bus_get_device(parent, &parent_device))
333 parent_device = NULL;
335 ret = acpi_bus_add(&device, parent_device, handle,
336 ACPI_BUS_TYPE_DEVICE);
338 pr_debug("error adding bus, %x\n",
347 * dock_remove_acpi_device - remove the acpi_device struct from acpi
348 * @handle - the handle of the device to remove
350 * Tell acpi to remove the acpi_device. This should cause any loaded
351 * driver to have it's remove routine called.
353 static void dock_remove_acpi_device(acpi_handle handle)
355 struct acpi_device *device;
358 if (!acpi_bus_get_device(handle, &device)) {
359 ret = acpi_bus_trim(device, 1);
361 pr_debug("error removing bus, %x\n", -ret);
367 * hotplug_dock_devices - insert or remove devices on the dock station
368 * @ds: the dock station
369 * @event: either bus check or eject request
371 * Some devices on the dock station need to have drivers called
372 * to perform hotplug operations after a dock event has occurred.
373 * Traverse the list of dock devices that have registered a
374 * hotplug handler, and call the handler.
376 static void hotplug_dock_devices(struct dock_station *ds, u32 event)
378 struct dock_dependent_device *dd;
380 mutex_lock(&ds->hp_lock);
383 * First call driver specific hotplug functions
385 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) {
386 if (dd->ops && dd->ops->handler)
387 dd->ops->handler(dd->handle, event, dd->context);
391 * Now make sure that an acpi_device is created for each
392 * dependent device, or removed if this is an eject request.
393 * This will cause acpi_drivers to be stopped/started if they
396 list_for_each_entry(dd, &ds->dependent_devices, list) {
397 if (event == ACPI_NOTIFY_EJECT_REQUEST)
398 dock_remove_acpi_device(dd->handle);
400 dock_create_acpi_device(dd->handle);
402 mutex_unlock(&ds->hp_lock);
405 static void dock_event(struct dock_station *ds, u32 event, int num)
407 struct device *dev = &ds->dock_device->dev;
408 char event_string[13];
409 char *envp[] = { event_string, NULL };
410 struct dock_dependent_device *dd;
412 if (num == UNDOCK_EVENT)
413 sprintf(event_string, "EVENT=undock");
415 sprintf(event_string, "EVENT=dock");
418 * Indicate that the status of the dock station has
421 if (num == DOCK_EVENT)
422 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
424 list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
425 if (dd->ops && dd->ops->uevent)
426 dd->ops->uevent(dd->handle, event, dd->context);
427 if (num != DOCK_EVENT)
428 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
432 * eject_dock - respond to a dock eject request
433 * @ds: the dock station
435 * This is called after _DCK is called, to execute the dock station's
438 static void eject_dock(struct dock_station *ds)
440 struct acpi_object_list arg_list;
441 union acpi_object arg;
445 /* all dock devices should have _EJ0, but check anyway */
446 status = acpi_get_handle(ds->handle, "_EJ0", &tmp);
447 if (ACPI_FAILURE(status)) {
448 pr_debug("No _EJ0 support for dock device\n");
453 arg_list.pointer = &arg;
454 arg.type = ACPI_TYPE_INTEGER;
455 arg.integer.value = 1;
457 if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0",
459 pr_debug("Failed to evaluate _EJ0!\n");
463 * handle_dock - handle a dock event
464 * @ds: the dock station
465 * @dock: to dock, or undock - that is the question
467 * Execute the _DCK method in response to an acpi event
469 static void handle_dock(struct dock_station *ds, int dock)
472 struct acpi_object_list arg_list;
473 union acpi_object arg;
474 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
475 struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
477 acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer);
479 printk(KERN_INFO PREFIX "%s - %s\n",
480 (char *)name_buffer.pointer, dock ? "docking" : "undocking");
482 /* _DCK method has one argument */
484 arg_list.pointer = &arg;
485 arg.type = ACPI_TYPE_INTEGER;
486 arg.integer.value = dock;
487 status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
488 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
489 ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute"
490 " _DCK\n", (char *)name_buffer.pointer));
492 kfree(buffer.pointer);
493 kfree(name_buffer.pointer);
496 static inline void dock(struct dock_station *ds)
501 static inline void undock(struct dock_station *ds)
506 static inline void begin_dock(struct dock_station *ds)
508 ds->flags |= DOCK_DOCKING;
511 static inline void complete_dock(struct dock_station *ds)
513 ds->flags &= ~(DOCK_DOCKING);
514 ds->last_dock_time = jiffies;
517 static inline void begin_undock(struct dock_station *ds)
519 ds->flags |= DOCK_UNDOCKING;
522 static inline void complete_undock(struct dock_station *ds)
524 ds->flags &= ~(DOCK_UNDOCKING);
527 static void dock_lock(struct dock_station *ds, int lock)
529 struct acpi_object_list arg_list;
530 union acpi_object arg;
534 arg_list.pointer = &arg;
535 arg.type = ACPI_TYPE_INTEGER;
536 arg.integer.value = !!lock;
537 status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
538 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
540 printk(KERN_WARNING PREFIX "Locking device failed\n");
542 printk(KERN_WARNING PREFIX "Unlocking device failed\n");
547 * dock_in_progress - see if we are in the middle of handling a dock event
548 * @ds: the dock station
550 * Sometimes while docking, false dock events can be sent to the driver
551 * because good connections aren't made or some other reason. Ignore these
552 * if we are in the middle of doing something.
554 static int dock_in_progress(struct dock_station *ds)
556 if ((ds->flags & DOCK_DOCKING) ||
557 time_before(jiffies, (ds->last_dock_time + HZ)))
563 * register_dock_notifier - add yourself to the dock notifier list
564 * @nb: the callers notifier block
566 * If a driver wishes to be notified about dock events, they can
567 * use this function to put a notifier block on the dock notifier list.
568 * this notifier call chain will be called after a dock event, but
569 * before hotplugging any new devices.
571 int register_dock_notifier(struct notifier_block *nb)
573 if (!dock_station_count)
576 return atomic_notifier_chain_register(&dock_notifier_list, nb);
579 EXPORT_SYMBOL_GPL(register_dock_notifier);
582 * unregister_dock_notifier - remove yourself from the dock notifier list
583 * @nb: the callers notifier block
585 void unregister_dock_notifier(struct notifier_block *nb)
587 if (!dock_station_count)
590 atomic_notifier_chain_unregister(&dock_notifier_list, nb);
593 EXPORT_SYMBOL_GPL(unregister_dock_notifier);
596 * register_hotplug_dock_device - register a hotplug function
597 * @handle: the handle of the device
598 * @ops: handlers to call after docking
599 * @context: device specific data
601 * If a driver would like to perform a hotplug operation after a dock
602 * event, they can register an acpi_notifiy_handler to be called by
603 * the dock driver after _DCK is executed.
606 register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops,
609 struct dock_dependent_device *dd;
610 struct dock_station *dock_station;
613 if (!dock_station_count)
617 * make sure this handle is for a device dependent on the dock,
618 * this would include the dock station itself
620 list_for_each_entry(dock_station, &dock_stations, sibiling) {
622 * An ATA bay can be in a dock and itself can be ejected
623 * seperately, so there are two 'dock stations' which need the
626 dd = find_dock_dependent_device(dock_station, handle);
629 dd->context = context;
630 dock_add_hotplug_device(dock_station, dd);
638 EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
641 * unregister_hotplug_dock_device - remove yourself from the hotplug list
642 * @handle: the acpi handle of the device
644 void unregister_hotplug_dock_device(acpi_handle handle)
646 struct dock_dependent_device *dd;
647 struct dock_station *dock_station;
649 if (!dock_station_count)
652 list_for_each_entry(dock_station, &dock_stations, sibiling) {
653 dd = find_dock_dependent_device(dock_station, handle);
655 dock_del_hotplug_device(dock_station, dd);
659 EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
662 * handle_eject_request - handle an undock request checking for error conditions
664 * Check to make sure the dock device is still present, then undock and
665 * hotremove all the devices that may need removing.
667 static int handle_eject_request(struct dock_station *ds, u32 event)
669 if (dock_in_progress(ds))
673 * here we need to generate the undock
674 * event prior to actually doing the undock
675 * so that the device struct still exists.
676 * Also, even send the dock event if the
677 * device is not present anymore
679 dock_event(ds, event, UNDOCK_EVENT);
681 hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
685 if (dock_present(ds)) {
686 printk(KERN_ERR PREFIX "Unable to undock!\n");
694 * dock_notify - act upon an acpi dock notification
695 * @handle: the dock station handle
696 * @event: the acpi event
697 * @data: our driver data struct
699 * If we are notified to dock, then check to see if the dock is
700 * present and then dock. Notify all drivers of the dock event,
701 * and then hotplug and devices that may need hotplugging.
703 static void dock_notify(acpi_handle handle, u32 event, void *data)
705 struct dock_station *ds = data;
706 struct acpi_device *tmp;
707 int surprise_removal = 0;
710 * According to acpi spec 3.0a, if a DEVICE_CHECK notification
711 * is sent and _DCK is present, it is assumed to mean an undock
714 if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK)
715 event = ACPI_NOTIFY_EJECT_REQUEST;
718 * dock station: BUS_CHECK - docked or surprise removal
719 * DEVICE_CHECK - undocked
720 * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal
722 * To simplify event handling, dock dependent device handler always
723 * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
724 * ACPI_NOTIFY_EJECT_REQUEST for removal
727 case ACPI_NOTIFY_BUS_CHECK:
728 case ACPI_NOTIFY_DEVICE_CHECK:
729 if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
733 if (!dock_present(ds)) {
734 printk(KERN_ERR PREFIX "Unable to dock!\n");
738 atomic_notifier_call_chain(&dock_notifier_list,
740 hotplug_dock_devices(ds, event);
742 dock_event(ds, event, DOCK_EVENT);
746 if (dock_present(ds) || dock_in_progress(ds))
748 /* This is a surprise removal */
749 surprise_removal = 1;
750 event = ACPI_NOTIFY_EJECT_REQUEST;
752 case ACPI_NOTIFY_EJECT_REQUEST:
754 if ((immediate_undock && !(ds->flags & DOCK_IS_ATA))
756 handle_eject_request(ds, event);
758 dock_event(ds, event, UNDOCK_EVENT);
761 printk(KERN_ERR PREFIX "Unknown dock event %d\n", event);
768 struct dock_station *ds;
771 static void acpi_dock_deferred_cb(void *context)
773 struct dock_data *data = (struct dock_data *)context;
775 dock_notify(data->handle, data->event, data->ds);
779 static int acpi_dock_notifier_call(struct notifier_block *this,
780 unsigned long event, void *data)
782 struct dock_station *dock_station;
783 acpi_handle handle = (acpi_handle)data;
785 if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
786 && event != ACPI_NOTIFY_EJECT_REQUEST)
788 list_for_each_entry(dock_station, &dock_stations, sibiling) {
789 if (dock_station->handle == handle) {
790 struct dock_data *dock_data;
792 dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL);
795 dock_data->handle = handle;
796 dock_data->event = event;
797 dock_data->ds = dock_station;
798 acpi_os_hotplug_execute(acpi_dock_deferred_cb,
806 static struct notifier_block dock_acpi_notifier = {
807 .notifier_call = acpi_dock_notifier_call,
811 * find_dock_devices - find devices on the dock station
812 * @handle: the handle of the device we are examining
814 * @context: the dock station private data
817 * This function is called by acpi_walk_namespace. It will
818 * check to see if an object has an _EJD method. If it does, then it
819 * will see if it is dependent on the dock station.
822 find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv)
825 acpi_handle tmp, parent;
826 struct dock_station *ds = context;
827 struct dock_dependent_device *dd;
829 status = acpi_bus_get_ejd(handle, &tmp);
830 if (ACPI_FAILURE(status)) {
831 /* try the parent device as well */
832 status = acpi_get_parent(handle, &parent);
833 if (ACPI_FAILURE(status))
835 /* see if parent is dependent on dock */
836 status = acpi_bus_get_ejd(parent, &tmp);
837 if (ACPI_FAILURE(status))
841 if (tmp == ds->handle) {
842 dd = alloc_dock_dependent_device(handle);
844 add_dock_dependent_device(ds, dd);
851 * show_docked - read method for "docked" file in sysfs
853 static ssize_t show_docked(struct device *dev,
854 struct device_attribute *attr, char *buf)
856 struct acpi_device *tmp;
858 struct dock_station *dock_station = *((struct dock_station **)
861 if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp)))
862 return snprintf(buf, PAGE_SIZE, "1\n");
863 return snprintf(buf, PAGE_SIZE, "0\n");
865 static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);
868 * show_flags - read method for flags file in sysfs
870 static ssize_t show_flags(struct device *dev,
871 struct device_attribute *attr, char *buf)
873 struct dock_station *dock_station = *((struct dock_station **)
875 return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
878 static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
881 * write_undock - write method for "undock" file in sysfs
883 static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
884 const char *buf, size_t count)
887 struct dock_station *dock_station = *((struct dock_station **)
893 begin_undock(dock_station);
894 ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
895 return ret ? ret: count;
897 static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
900 * show_dock_uid - read method for "uid" file in sysfs
902 static ssize_t show_dock_uid(struct device *dev,
903 struct device_attribute *attr, char *buf)
905 unsigned long long lbuf;
906 struct dock_station *dock_station = *((struct dock_station **)
908 acpi_status status = acpi_evaluate_integer(dock_station->handle,
909 "_UID", NULL, &lbuf);
910 if (ACPI_FAILURE(status))
913 return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf);
915 static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
917 static ssize_t show_dock_type(struct device *dev,
918 struct device_attribute *attr, char *buf)
920 struct dock_station *dock_station = *((struct dock_station **)
924 if (dock_station->flags & DOCK_IS_DOCK)
925 type = "dock_station";
926 else if (dock_station->flags & DOCK_IS_ATA)
928 else if (dock_station->flags & DOCK_IS_BAT)
929 type = "battery_bay";
933 return snprintf(buf, PAGE_SIZE, "%s\n", type);
935 static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL);
938 * dock_add - add a new dock station
939 * @handle: the dock station handle
941 * allocated and initialize a new dock station device. Find all devices
942 * that are on the dock station, and register for dock event notifications.
944 static int dock_add(acpi_handle handle)
947 struct dock_dependent_device *dd;
948 struct dock_station *dock_station;
949 struct platform_device *dock_device;
951 /* allocate & initialize the dock_station private data */
952 dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL);
955 dock_station->handle = handle;
956 dock_station->last_dock_time = jiffies - HZ;
957 INIT_LIST_HEAD(&dock_station->dependent_devices);
958 INIT_LIST_HEAD(&dock_station->hotplug_devices);
959 INIT_LIST_HEAD(&dock_station->sibiling);
960 spin_lock_init(&dock_station->dd_lock);
961 mutex_init(&dock_station->hp_lock);
962 ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
964 /* initialize platform device stuff */
965 dock_station->dock_device =
966 platform_device_register_simple(dock_device_name,
967 dock_station_count, NULL, 0);
968 dock_device = dock_station->dock_device;
969 if (IS_ERR(dock_device)) {
972 return PTR_ERR(dock_device);
974 platform_device_add_data(dock_device, &dock_station,
975 sizeof(struct dock_station *));
977 /* we want the dock device to send uevents */
978 dev_set_uevent_suppress(&dock_device->dev, 0);
981 dock_station->flags |= DOCK_IS_DOCK;
983 dock_station->flags |= DOCK_IS_ATA;
984 if (is_battery(handle))
985 dock_station->flags |= DOCK_IS_BAT;
987 ret = device_create_file(&dock_device->dev, &dev_attr_docked);
989 printk(KERN_ERR "Error %d adding sysfs file\n", ret);
990 platform_device_unregister(dock_device);
995 ret = device_create_file(&dock_device->dev, &dev_attr_undock);
997 printk(KERN_ERR "Error %d adding sysfs file\n", ret);
998 device_remove_file(&dock_device->dev, &dev_attr_docked);
999 platform_device_unregister(dock_device);
1000 kfree(dock_station);
1001 dock_station = NULL;
1004 ret = device_create_file(&dock_device->dev, &dev_attr_uid);
1006 printk(KERN_ERR "Error %d adding sysfs file\n", ret);
1007 device_remove_file(&dock_device->dev, &dev_attr_docked);
1008 device_remove_file(&dock_device->dev, &dev_attr_undock);
1009 platform_device_unregister(dock_device);
1010 kfree(dock_station);
1011 dock_station = NULL;
1014 ret = device_create_file(&dock_device->dev, &dev_attr_flags);
1016 printk(KERN_ERR "Error %d adding sysfs file\n", ret);
1017 device_remove_file(&dock_device->dev, &dev_attr_docked);
1018 device_remove_file(&dock_device->dev, &dev_attr_undock);
1019 device_remove_file(&dock_device->dev, &dev_attr_uid);
1020 platform_device_unregister(dock_device);
1021 kfree(dock_station);
1022 dock_station = NULL;
1025 ret = device_create_file(&dock_device->dev, &dev_attr_type);
1027 printk(KERN_ERR"Error %d adding sysfs file\n", ret);
1029 /* Find dependent devices */
1030 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1031 ACPI_UINT32_MAX, find_dock_devices, dock_station,
1034 /* add the dock station as a device dependent on itself */
1035 dd = alloc_dock_dependent_device(handle);
1037 kfree(dock_station);
1038 dock_station = NULL;
1040 goto dock_add_err_unregister;
1042 add_dock_dependent_device(dock_station, dd);
1044 dock_station_count++;
1045 list_add(&dock_station->sibiling, &dock_stations);
1048 dock_add_err_unregister:
1049 device_remove_file(&dock_device->dev, &dev_attr_type);
1050 device_remove_file(&dock_device->dev, &dev_attr_docked);
1051 device_remove_file(&dock_device->dev, &dev_attr_undock);
1052 device_remove_file(&dock_device->dev, &dev_attr_uid);
1053 device_remove_file(&dock_device->dev, &dev_attr_flags);
1054 platform_device_unregister(dock_device);
1055 kfree(dock_station);
1056 dock_station = NULL;
1061 * dock_remove - free up resources related to the dock station
1063 static int dock_remove(struct dock_station *dock_station)
1065 struct dock_dependent_device *dd, *tmp;
1066 struct platform_device *dock_device = dock_station->dock_device;
1068 if (!dock_station_count)
1071 /* remove dependent devices */
1072 list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices,
1077 device_remove_file(&dock_device->dev, &dev_attr_type);
1078 device_remove_file(&dock_device->dev, &dev_attr_docked);
1079 device_remove_file(&dock_device->dev, &dev_attr_undock);
1080 device_remove_file(&dock_device->dev, &dev_attr_uid);
1081 device_remove_file(&dock_device->dev, &dev_attr_flags);
1082 platform_device_unregister(dock_device);
1084 /* free dock station memory */
1085 kfree(dock_station);
1086 dock_station = NULL;
1091 * find_dock - look for a dock station
1092 * @handle: acpi handle of a device
1094 * @context: counter of dock stations found
1097 * This is called by acpi_walk_namespace to look for dock stations.
1100 find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
1102 acpi_status status = AE_OK;
1104 if (is_dock(handle)) {
1105 if (dock_add(handle) >= 0) {
1106 status = AE_CTRL_TERMINATE;
1113 find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
1115 /* If bay is a dock, it's already handled */
1116 if (is_ejectable_bay(handle) && !is_dock(handle))
1121 static int __init dock_init(void)
1126 /* look for a dock station */
1127 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1128 ACPI_UINT32_MAX, find_dock, NULL, NULL);
1131 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1132 ACPI_UINT32_MAX, find_bay, NULL, NULL);
1133 if (!dock_station_count) {
1134 printk(KERN_INFO PREFIX "No dock devices found.\n");
1138 register_acpi_bus_notifier(&dock_acpi_notifier);
1139 printk(KERN_INFO PREFIX "%s: %d docks/bays found\n",
1140 ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
1144 static void __exit dock_exit(void)
1146 struct dock_station *dock_station;
1147 struct dock_station *tmp;
1149 unregister_acpi_bus_notifier(&dock_acpi_notifier);
1150 list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibiling)
1151 dock_remove(dock_station);
1155 * Must be called before drivers of devices in dock, otherwise we can't know
1156 * which devices are in a dock
1158 subsys_initcall(dock_init);
1159 module_exit(dock_exit);