| /* |
| * dock.c - ACPI dock station driver |
| * |
| * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/notifier.h> |
| #include <linux/platform_device.h> |
| #include <linux/jiffies.h> |
| #include <linux/stddef.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| |
| #define PREFIX "ACPI: " |
| |
| #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
| |
| ACPI_MODULE_NAME("dock"); |
| MODULE_AUTHOR("Kristen Carlson Accardi"); |
| MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
| MODULE_LICENSE("GPL"); |
| |
| static int immediate_undock = 1; |
| module_param(immediate_undock, bool, 0644); |
| MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " |
| "undock immediately when the undock button is pressed, 0 will cause" |
| " the driver to wait for userspace to write the undock sysfs file " |
| " before undocking"); |
| |
| static struct atomic_notifier_head dock_notifier_list; |
| static char dock_device_name[] = "dock"; |
| |
| static const struct acpi_device_id dock_device_ids[] = { |
| {"LNXDOCK", 0}, |
| {"", 0}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, dock_device_ids); |
| |
| struct dock_station { |
| acpi_handle handle; |
| unsigned long last_dock_time; |
| u32 flags; |
| spinlock_t dd_lock; |
| struct mutex hp_lock; |
| struct list_head dependent_devices; |
| struct list_head hotplug_devices; |
| |
| struct list_head sibiling; |
| struct platform_device *dock_device; |
| }; |
| static LIST_HEAD(dock_stations); |
| static int dock_station_count; |
| |
| struct dock_dependent_device { |
| struct list_head list; |
| struct list_head hotplug_list; |
| acpi_handle handle; |
| struct acpi_dock_ops *ops; |
| void *context; |
| }; |
| |
| #define DOCK_DOCKING 0x00000001 |
| #define DOCK_UNDOCKING 0x00000002 |
| #define DOCK_IS_DOCK 0x00000010 |
| #define DOCK_IS_ATA 0x00000020 |
| #define DOCK_IS_BAT 0x00000040 |
| #define DOCK_EVENT 3 |
| #define UNDOCK_EVENT 2 |
| |
| /***************************************************************************** |
| * Dock Dependent device functions * |
| *****************************************************************************/ |
| /** |
| * alloc_dock_dependent_device - allocate and init a dependent device |
| * @handle: the acpi_handle of the dependent device |
| * |
| * Allocate memory for a dependent device structure for a device referenced |
| * by the acpi handle |
| */ |
| static struct dock_dependent_device * |
| alloc_dock_dependent_device(acpi_handle handle) |
| { |
| struct dock_dependent_device *dd; |
| |
| dd = kzalloc(sizeof(*dd), GFP_KERNEL); |
| if (dd) { |
| dd->handle = handle; |
| INIT_LIST_HEAD(&dd->list); |
| INIT_LIST_HEAD(&dd->hotplug_list); |
| } |
| return dd; |
| } |
| |
| /** |
| * add_dock_dependent_device - associate a device with the dock station |
| * @ds: The dock station |
| * @dd: The dependent device |
| * |
| * Add the dependent device to the dock's dependent device list. |
| */ |
| static void |
| add_dock_dependent_device(struct dock_station *ds, |
| struct dock_dependent_device *dd) |
| { |
| spin_lock(&ds->dd_lock); |
| list_add_tail(&dd->list, &ds->dependent_devices); |
| spin_unlock(&ds->dd_lock); |
| } |
| |
| /** |
| * dock_add_hotplug_device - associate a hotplug handler with the dock station |
| * @ds: The dock station |
| * @dd: The dependent device struct |
| * |
| * Add the dependent device to the dock's hotplug device list |
| */ |
| static void |
| dock_add_hotplug_device(struct dock_station *ds, |
| struct dock_dependent_device *dd) |
| { |
| mutex_lock(&ds->hp_lock); |
| list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); |
| mutex_unlock(&ds->hp_lock); |
| } |
| |
| /** |
| * dock_del_hotplug_device - remove a hotplug handler from the dock station |
| * @ds: The dock station |
| * @dd: the dependent device struct |
| * |
| * Delete the dependent device from the dock's hotplug device list |
| */ |
| static void |
| dock_del_hotplug_device(struct dock_station *ds, |
| struct dock_dependent_device *dd) |
| { |
| mutex_lock(&ds->hp_lock); |
| list_del(&dd->hotplug_list); |
| mutex_unlock(&ds->hp_lock); |
| } |
| |
| /** |
| * find_dock_dependent_device - get a device dependent on this dock |
| * @ds: the dock station |
| * @handle: the acpi_handle of the device we want |
| * |
| * iterate over the dependent device list for this dock. If the |
| * dependent device matches the handle, return. |
| */ |
| static struct dock_dependent_device * |
| find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) |
| { |
| struct dock_dependent_device *dd; |
| |
| spin_lock(&ds->dd_lock); |
| list_for_each_entry(dd, &ds->dependent_devices, list) { |
| if (handle == dd->handle) { |
| spin_unlock(&ds->dd_lock); |
| return dd; |
| } |
| } |
| spin_unlock(&ds->dd_lock); |
| return NULL; |
| } |
| |
| /***************************************************************************** |
| * Dock functions * |
| *****************************************************************************/ |
| /** |
| * is_dock - see if a device is a dock station |
| * @handle: acpi handle of the device |
| * |
| * If an acpi object has a _DCK method, then it is by definition a dock |
| * station, so return true. |
| */ |
| static int is_dock(acpi_handle handle) |
| { |
| acpi_status status; |
| acpi_handle tmp; |
| |
| status = acpi_get_handle(handle, "_DCK", &tmp); |
| if (ACPI_FAILURE(status)) |
| return 0; |
| return 1; |
| } |
| |
| static int is_ejectable(acpi_handle handle) |
| { |
| acpi_status status; |
| acpi_handle tmp; |
| |
| status = acpi_get_handle(handle, "_EJ0", &tmp); |
| if (ACPI_FAILURE(status)) |
| return 0; |
| return 1; |
| } |
| |
| static int is_ata(acpi_handle handle) |
| { |
| acpi_handle tmp; |
| |
| if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || |
| (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int is_battery(acpi_handle handle) |
| { |
| struct acpi_device_info *info; |
| struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| int ret = 1; |
| |
| if (!ACPI_SUCCESS(acpi_get_object_info(handle, &buffer))) |
| return 0; |
| info = buffer.pointer; |
| if (!(info->valid & ACPI_VALID_HID)) |
| ret = 0; |
| else |
| ret = !strcmp("PNP0C0A", info->hardware_id.value); |
| |
| kfree(buffer.pointer); |
| return ret; |
| } |
| |
| static int is_ejectable_bay(acpi_handle handle) |
| { |
| acpi_handle phandle; |
| if (!is_ejectable(handle)) |
| return 0; |
| if (is_battery(handle) || is_ata(handle)) |
| return 1; |
| if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) |
| return 1; |
| return 0; |
| } |
| |
| /** |
| * is_dock_device - see if a device is on a dock station |
| * @handle: acpi handle of the device |
| * |
| * If this device is either the dock station itself, |
| * or is a device dependent on the dock station, then it |
| * is a dock device |
| */ |
| int is_dock_device(acpi_handle handle) |
| { |
| struct dock_station *dock_station; |
| |
| if (!dock_station_count) |
| return 0; |
| |
| if (is_dock(handle)) |
| return 1; |
| list_for_each_entry(dock_station, &dock_stations, sibiling) { |
| if (find_dock_dependent_device(dock_station, handle)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| EXPORT_SYMBOL_GPL(is_dock_device); |
| |
| /** |
| * dock_present - see if the dock station is present. |
| * @ds: the dock station |
| * |
| * execute the _STA method. note that present does not |
| * imply that we are docked. |
| */ |
| static int dock_present(struct dock_station *ds) |
| { |
| unsigned long long sta; |
| acpi_status status; |
| |
| if (ds) { |
| status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); |
| if (ACPI_SUCCESS(status) && sta) |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| |
| /** |
| * dock_create_acpi_device - add new devices to acpi |
| * @handle - handle of the device to add |
| * |
| * This function will create a new acpi_device for the given |
| * handle if one does not exist already. This should cause |
| * acpi to scan for drivers for the given devices, and call |
| * matching driver's add routine. |
| * |
| * Returns a pointer to the acpi_device corresponding to the handle. |
| */ |
| static struct acpi_device * dock_create_acpi_device(acpi_handle handle) |
| { |
| struct acpi_device *device = NULL; |
| struct acpi_device *parent_device; |
| acpi_handle parent; |
| int ret; |
| |
| if (acpi_bus_get_device(handle, &device)) { |
| /* |
| * no device created for this object, |
| * so we should create one. |
| */ |
| acpi_get_parent(handle, &parent); |
| if (acpi_bus_get_device(parent, &parent_device)) |
| parent_device = NULL; |
| |
| ret = acpi_bus_add(&device, parent_device, handle, |
| ACPI_BUS_TYPE_DEVICE); |
| if (ret) { |
| pr_debug("error adding bus, %x\n", |
| -ret); |
| return NULL; |
| } |
| } |
| return device; |
| } |
| |
| /** |
| * dock_remove_acpi_device - remove the acpi_device struct from acpi |
| * @handle - the handle of the device to remove |
| * |
| * Tell acpi to remove the acpi_device. This should cause any loaded |
| * driver to have it's remove routine called. |
| */ |
| static void dock_remove_acpi_device(acpi_handle handle) |
| { |
| struct acpi_device *device; |
| int ret; |
| |
| if (!acpi_bus_get_device(handle, &device)) { |
| ret = acpi_bus_trim(device, 1); |
| if (ret) |
| pr_debug("error removing bus, %x\n", -ret); |
| } |
| } |
| |
| |
| /** |
| * hotplug_dock_devices - insert or remove devices on the dock station |
| * @ds: the dock station |
| * @event: either bus check or eject request |
| * |
| * Some devices on the dock station need to have drivers called |
| * to perform hotplug operations after a dock event has occurred. |
| * Traverse the list of dock devices that have registered a |
| * hotplug handler, and call the handler. |
| */ |
| static void hotplug_dock_devices(struct dock_station *ds, u32 event) |
| { |
| struct dock_dependent_device *dd; |
| |
| mutex_lock(&ds->hp_lock); |
| |
| /* |
| * First call driver specific hotplug functions |
| */ |
| list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { |
| if (dd->ops && dd->ops->handler) |
| dd->ops->handler(dd->handle, event, dd->context); |
| } |
| |
| /* |
| * Now make sure that an acpi_device is created for each |
| * dependent device, or removed if this is an eject request. |
| * This will cause acpi_drivers to be stopped/started if they |
| * exist |
| */ |
| list_for_each_entry(dd, &ds->dependent_devices, list) { |
| if (event == ACPI_NOTIFY_EJECT_REQUEST) |
| dock_remove_acpi_device(dd->handle); |
| else |
| dock_create_acpi_device(dd->handle); |
| } |
| mutex_unlock(&ds->hp_lock); |
| } |
| |
| static void dock_event(struct dock_station *ds, u32 event, int num) |
| { |
| struct device *dev = &ds->dock_device->dev; |
| char event_string[13]; |
| char *envp[] = { event_string, NULL }; |
| struct dock_dependent_device *dd; |
| |
| if (num == UNDOCK_EVENT) |
| sprintf(event_string, "EVENT=undock"); |
| else |
| sprintf(event_string, "EVENT=dock"); |
| |
| /* |
| * Indicate that the status of the dock station has |
| * changed. |
| */ |
| if (num == DOCK_EVENT) |
| kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
| |
| list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) |
| if (dd->ops && dd->ops->uevent) |
| dd->ops->uevent(dd->handle, event, dd->context); |
| if (num != DOCK_EVENT) |
| kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
| } |
| |
| /** |
| * eject_dock - respond to a dock eject request |
| * @ds: the dock station |
| * |
| * This is called after _DCK is called, to execute the dock station's |
| * _EJ0 method. |
| */ |
| static void eject_dock(struct dock_station *ds) |
| { |
| struct acpi_object_list arg_list; |
| union acpi_object arg; |
| acpi_status status; |
| acpi_handle tmp; |
| |
| /* all dock devices should have _EJ0, but check anyway */ |
| status = acpi_get_handle(ds->handle, "_EJ0", &tmp); |
| if (ACPI_FAILURE(status)) { |
| pr_debug("No _EJ0 support for dock device\n"); |
| return; |
| } |
| |
| arg_list.count = 1; |
| arg_list.pointer = &arg; |
| arg.type = ACPI_TYPE_INTEGER; |
| arg.integer.value = 1; |
| |
| if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", |
| &arg_list, NULL))) |
| pr_debug("Failed to evaluate _EJ0!\n"); |
| } |
| |
| /** |
| * handle_dock - handle a dock event |
| * @ds: the dock station |
| * @dock: to dock, or undock - that is the question |
| * |
| * Execute the _DCK method in response to an acpi event |
| */ |
| static void handle_dock(struct dock_station *ds, int dock) |
| { |
| acpi_status status; |
| struct acpi_object_list arg_list; |
| union acpi_object arg; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| |
| acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); |
| |
| printk(KERN_INFO PREFIX "%s - %s\n", |
| (char *)name_buffer.pointer, dock ? "docking" : "undocking"); |
| |
| /* _DCK method has one argument */ |
| arg_list.count = 1; |
| arg_list.pointer = &arg; |
| arg.type = ACPI_TYPE_INTEGER; |
| arg.integer.value = dock; |
| status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); |
| if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
| ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" |
| " _DCK\n", (char *)name_buffer.pointer)); |
| |
| kfree(buffer.pointer); |
| kfree(name_buffer.pointer); |
| } |
| |
| static inline void dock(struct dock_station *ds) |
| { |
| handle_dock(ds, 1); |
| } |
| |
| static inline void undock(struct dock_station *ds) |
| { |
| handle_dock(ds, 0); |
| } |
| |
| static inline void begin_dock(struct dock_station *ds) |
| { |
| ds->flags |= DOCK_DOCKING; |
| } |
| |
| static inline void complete_dock(struct dock_station *ds) |
| { |
| ds->flags &= ~(DOCK_DOCKING); |
| ds->last_dock_time = jiffies; |
| } |
| |
| static inline void begin_undock(struct dock_station *ds) |
| { |
| ds->flags |= DOCK_UNDOCKING; |
| } |
| |
| static inline void complete_undock(struct dock_station *ds) |
| { |
| ds->flags &= ~(DOCK_UNDOCKING); |
| } |
| |
| static void dock_lock(struct dock_station *ds, int lock) |
| { |
| struct acpi_object_list arg_list; |
| union acpi_object arg; |
| acpi_status status; |
| |
| arg_list.count = 1; |
| arg_list.pointer = &arg; |
| arg.type = ACPI_TYPE_INTEGER; |
| arg.integer.value = !!lock; |
| status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); |
| if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| if (lock) |
| printk(KERN_WARNING PREFIX "Locking device failed\n"); |
| else |
| printk(KERN_WARNING PREFIX "Unlocking device failed\n"); |
| } |
| } |
| |
| /** |
| * dock_in_progress - see if we are in the middle of handling a dock event |
| * @ds: the dock station |
| * |
| * Sometimes while docking, false dock events can be sent to the driver |
| * because good connections aren't made or some other reason. Ignore these |
| * if we are in the middle of doing something. |
| */ |
| static int dock_in_progress(struct dock_station *ds) |
| { |
| if ((ds->flags & DOCK_DOCKING) || |
| time_before(jiffies, (ds->last_dock_time + HZ))) |
| return 1; |
| return 0; |
| } |
| |
| /** |
| * register_dock_notifier - add yourself to the dock notifier list |
| * @nb: the callers notifier block |
| * |
| * If a driver wishes to be notified about dock events, they can |
| * use this function to put a notifier block on the dock notifier list. |
| * this notifier call chain will be called after a dock event, but |
| * before hotplugging any new devices. |
| */ |
| int register_dock_notifier(struct notifier_block *nb) |
| { |
| if (!dock_station_count) |
| return -ENODEV; |
| |
| return atomic_notifier_chain_register(&dock_notifier_list, nb); |
| } |
| |
| EXPORT_SYMBOL_GPL(register_dock_notifier); |
| |
| /** |
| * unregister_dock_notifier - remove yourself from the dock notifier list |
| * @nb: the callers notifier block |
| */ |
| void unregister_dock_notifier(struct notifier_block *nb) |
| { |
| if (!dock_station_count) |
| return; |
| |
| atomic_notifier_chain_unregister(&dock_notifier_list, nb); |
| } |
| |
| EXPORT_SYMBOL_GPL(unregister_dock_notifier); |
| |
| /** |
| * register_hotplug_dock_device - register a hotplug function |
| * @handle: the handle of the device |
| * @ops: handlers to call after docking |
| * @context: device specific data |
| * |
| * If a driver would like to perform a hotplug operation after a dock |
| * event, they can register an acpi_notifiy_handler to be called by |
| * the dock driver after _DCK is executed. |
| */ |
| int |
| register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, |
| void *context) |
| { |
| struct dock_dependent_device *dd; |
| struct dock_station *dock_station; |
| int ret = -EINVAL; |
| |
| if (!dock_station_count) |
| return -ENODEV; |
| |
| /* |
| * make sure this handle is for a device dependent on the dock, |
| * this would include the dock station itself |
| */ |
| list_for_each_entry(dock_station, &dock_stations, sibiling) { |
| /* |
| * An ATA bay can be in a dock and itself can be ejected |
| * seperately, so there are two 'dock stations' which need the |
| * ops |
| */ |
| dd = find_dock_dependent_device(dock_station, handle); |
| if (dd) { |
| dd->ops = ops; |
| dd->context = context; |
| dock_add_hotplug_device(dock_station, dd); |
| ret = 0; |
| } |
| } |
| |
| return ret; |
| } |
| |
| EXPORT_SYMBOL_GPL(register_hotplug_dock_device); |
| |
| /** |
| * unregister_hotplug_dock_device - remove yourself from the hotplug list |
| * @handle: the acpi handle of the device |
| */ |
| void unregister_hotplug_dock_device(acpi_handle handle) |
| { |
| struct dock_dependent_device *dd; |
| struct dock_station *dock_station; |
| |
| if (!dock_station_count) |
| return; |
| |
| list_for_each_entry(dock_station, &dock_stations, sibiling) { |
| dd = find_dock_dependent_device(dock_station, handle); |
| if (dd) |
| dock_del_hotplug_device(dock_station, dd); |
| } |
| } |
| |
| EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); |
| |
| /** |
| * handle_eject_request - handle an undock request checking for error conditions |
| * |
| * Check to make sure the dock device is still present, then undock and |
| * hotremove all the devices that may need removing. |
| */ |
| static int handle_eject_request(struct dock_station *ds, u32 event) |
| { |
| if (dock_in_progress(ds)) |
| return -EBUSY; |
| |
| /* |
| * here we need to generate the undock |
| * event prior to actually doing the undock |
| * so that the device struct still exists. |
| * Also, even send the dock event if the |
| * device is not present anymore |
| */ |
| dock_event(ds, event, UNDOCK_EVENT); |
| |
| hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); |
| undock(ds); |
| dock_lock(ds, 0); |
| eject_dock(ds); |
| if (dock_present(ds)) { |
| printk(KERN_ERR PREFIX "Unable to undock!\n"); |
| return -EBUSY; |
| } |
| complete_undock(ds); |
| return 0; |
| } |
| |
| /** |
| * dock_notify - act upon an acpi dock notification |
| * @handle: the dock station handle |
| * @event: the acpi event |
| * @data: our driver data struct |
| * |
| * If we are notified to dock, then check to see if the dock is |
| * present and then dock. Notify all drivers of the dock event, |
| * and then hotplug and devices that may need hotplugging. |
| */ |
| static void dock_notify(acpi_handle handle, u32 event, void *data) |
| { |
| struct dock_station *ds = data; |
| struct acpi_device *tmp; |
| int surprise_removal = 0; |
| |
| /* |
| * According to acpi spec 3.0a, if a DEVICE_CHECK notification |
| * is sent and _DCK is present, it is assumed to mean an undock |
| * request. |
| */ |
| if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) |
| event = ACPI_NOTIFY_EJECT_REQUEST; |
| |
| /* |
| * dock station: BUS_CHECK - docked or surprise removal |
| * DEVICE_CHECK - undocked |
| * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal |
| * |
| * To simplify event handling, dock dependent device handler always |
| * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and |
| * ACPI_NOTIFY_EJECT_REQUEST for removal |
| */ |
| switch (event) { |
| case ACPI_NOTIFY_BUS_CHECK: |
| case ACPI_NOTIFY_DEVICE_CHECK: |
| if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, |
| &tmp)) { |
| begin_dock(ds); |
| dock(ds); |
| if (!dock_present(ds)) { |
| printk(KERN_ERR PREFIX "Unable to dock!\n"); |
| complete_dock(ds); |
| break; |
| } |
| atomic_notifier_call_chain(&dock_notifier_list, |
| event, NULL); |
| hotplug_dock_devices(ds, event); |
| complete_dock(ds); |
| dock_event(ds, event, DOCK_EVENT); |
| dock_lock(ds, 1); |
| break; |
| } |
| if (dock_present(ds) || dock_in_progress(ds)) |
| break; |
| /* This is a surprise removal */ |
| surprise_removal = 1; |
| event = ACPI_NOTIFY_EJECT_REQUEST; |
| /* Fall back */ |
| case ACPI_NOTIFY_EJECT_REQUEST: |
| begin_undock(ds); |
| if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
| || surprise_removal) |
| handle_eject_request(ds, event); |
| else |
| dock_event(ds, event, UNDOCK_EVENT); |
| break; |
| default: |
| printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); |
| } |
| } |
| |
| struct dock_data { |
| acpi_handle handle; |
| unsigned long event; |
| struct dock_station *ds; |
| }; |
| |
| static void acpi_dock_deferred_cb(void *context) |
| { |
| struct dock_data *data = (struct dock_data *)context; |
| |
| dock_notify(data->handle, data->event, data->ds); |
| kfree(data); |
| } |
| |
| static int acpi_dock_notifier_call(struct notifier_block *this, |
| unsigned long event, void *data) |
| { |
| struct dock_station *dock_station; |
| acpi_handle handle = (acpi_handle)data; |
| |
| if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK |
| && event != ACPI_NOTIFY_EJECT_REQUEST) |
| return 0; |
| list_for_each_entry(dock_station, &dock_stations, sibiling) { |
| if (dock_station->handle == handle) { |
| struct dock_data *dock_data; |
| |
| dock_data = kmalloc(sizeof(*dock_data), GFP_KERNEL); |
| if (!dock_data) |
| return 0; |
| dock_data->handle = handle; |
| dock_data->event = event; |
| dock_data->ds = dock_station; |
| acpi_os_hotplug_execute(acpi_dock_deferred_cb, |
| dock_data); |
| return 0 ; |
| } |
| } |
| return 0; |
| } |
| |
| static struct notifier_block dock_acpi_notifier = { |
| .notifier_call = acpi_dock_notifier_call, |
| }; |
| |
| /** |
| * find_dock_devices - find devices on the dock station |
| * @handle: the handle of the device we are examining |
| * @lvl: unused |
| * @context: the dock station private data |
| * @rv: unused |
| * |
| * This function is called by acpi_walk_namespace. It will |
| * check to see if an object has an _EJD method. If it does, then it |
| * will see if it is dependent on the dock station. |
| */ |
| static acpi_status |
| find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| acpi_status status; |
| acpi_handle tmp, parent; |
| struct dock_station *ds = context; |
| struct dock_dependent_device *dd; |
| |
| status = acpi_bus_get_ejd(handle, &tmp); |
| if (ACPI_FAILURE(status)) { |
| /* try the parent device as well */ |
| status = acpi_get_parent(handle, &parent); |
| if (ACPI_FAILURE(status)) |
| goto fdd_out; |
| /* see if parent is dependent on dock */ |
| status = acpi_bus_get_ejd(parent, &tmp); |
| if (ACPI_FAILURE(status)) |
| goto fdd_out; |
| } |
| |
| if (tmp == ds->handle) { |
| dd = alloc_dock_dependent_device(handle); |
| if (dd) |
| add_dock_dependent_device(ds, dd); |
| } |
| fdd_out: |
| return AE_OK; |
| } |
| |
| /* |
| * show_docked - read method for "docked" file in sysfs |
| */ |
| static ssize_t show_docked(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_device *tmp; |
| |
| struct dock_station *dock_station = *((struct dock_station **) |
| dev->platform_data); |
| |
| if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) |
| return snprintf(buf, PAGE_SIZE, "1\n"); |
| return snprintf(buf, PAGE_SIZE, "0\n"); |
| } |
| static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
| |
| /* |
| * show_flags - read method for flags file in sysfs |
| */ |
| static ssize_t show_flags(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct dock_station *dock_station = *((struct dock_station **) |
| dev->platform_data); |
| return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
| |
| } |
| static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
| |
| /* |
| * write_undock - write method for "undock" file in sysfs |
| */ |
| static ssize_t write_undock(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| struct dock_station *dock_station = *((struct dock_station **) |
| dev->platform_data); |
| |
| if (!count) |
| return -EINVAL; |
| |
| begin_undock(dock_station); |
| ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
| return ret ? ret: count; |
| } |
| static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
| |
| /* |
| * show_dock_uid - read method for "uid" file in sysfs |
| */ |
| static ssize_t show_dock_uid(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| unsigned long long lbuf; |
| struct dock_station *dock_station = *((struct dock_station **) |
| dev->platform_data); |
| acpi_status status = acpi_evaluate_integer(dock_station->handle, |
| "_UID", NULL, &lbuf); |
| if (ACPI_FAILURE(status)) |
| return 0; |
| |
| return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
| } |
| static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
| |
| static ssize_t show_dock_type(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct dock_station *dock_station = *((struct dock_station **) |
| dev->platform_data); |
| char *type; |
| |
| if (dock_station->flags & DOCK_IS_DOCK) |
| type = "dock_station"; |
| else if (dock_station->flags & DOCK_IS_ATA) |
| type = "ata_bay"; |
| else if (dock_station->flags & DOCK_IS_BAT) |
| type = "battery_bay"; |
| else |
| type = "unknown"; |
| |
| return snprintf(buf, PAGE_SIZE, "%s\n", type); |
| } |
| static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); |
| |
| /** |
| * dock_add - add a new dock station |
| * @handle: the dock station handle |
| * |
| * allocated and initialize a new dock station device. Find all devices |
| * that are on the dock station, and register for dock event notifications. |
| */ |
| static int dock_add(acpi_handle handle) |
| { |
| int ret; |
| struct dock_dependent_device *dd; |
| struct dock_station *dock_station; |
| struct platform_device *dock_device; |
| |
| /* allocate & initialize the dock_station private data */ |
| dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); |
| if (!dock_station) |
| return -ENOMEM; |
| dock_station->handle = handle; |
| dock_station->last_dock_time = jiffies - HZ; |
| INIT_LIST_HEAD(&dock_station->dependent_devices); |
| INIT_LIST_HEAD(&dock_station->hotplug_devices); |
| INIT_LIST_HEAD(&dock_station->sibiling); |
| spin_lock_init(&dock_station->dd_lock); |
| mutex_init(&dock_station->hp_lock); |
| ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); |
| |
| /* initialize platform device stuff */ |
| dock_station->dock_device = |
| platform_device_register_simple(dock_device_name, |
| dock_station_count, NULL, 0); |
| dock_device = dock_station->dock_device; |
| if (IS_ERR(dock_device)) { |
| kfree(dock_station); |
| dock_station = NULL; |
| return PTR_ERR(dock_device); |
| } |
| platform_device_add_data(dock_device, &dock_station, |
| sizeof(struct dock_station *)); |
| |
| /* we want the dock device to send uevents */ |
| dev_set_uevent_suppress(&dock_device->dev, 0); |
| |
| if (is_dock(handle)) |
| dock_station->flags |= DOCK_IS_DOCK; |
| if (is_ata(handle)) |
| dock_station->flags |= DOCK_IS_ATA; |
| if (is_battery(handle)) |
| dock_station->flags |= DOCK_IS_BAT; |
| |
| ret = device_create_file(&dock_device->dev, &dev_attr_docked); |
| if (ret) { |
| printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
| platform_device_unregister(dock_device); |
| kfree(dock_station); |
| dock_station = NULL; |
| return ret; |
| } |
| ret = device_create_file(&dock_device->dev, &dev_attr_undock); |
| if (ret) { |
| printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
| device_remove_file(&dock_device->dev, &dev_attr_docked); |
| platform_device_unregister(dock_device); |
| kfree(dock_station); |
| dock_station = NULL; |
| return ret; |
| } |
| ret = device_create_file(&dock_device->dev, &dev_attr_uid); |
| if (ret) { |
| printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
| device_remove_file(&dock_device->dev, &dev_attr_docked); |
| device_remove_file(&dock_device->dev, &dev_attr_undock); |
| platform_device_unregister(dock_device); |
| kfree(dock_station); |
| dock_station = NULL; |
| return ret; |
| } |
| ret = device_create_file(&dock_device->dev, &dev_attr_flags); |
| if (ret) { |
| printk(KERN_ERR "Error %d adding sysfs file\n", ret); |
| device_remove_file(&dock_device->dev, &dev_attr_docked); |
| device_remove_file(&dock_device->dev, &dev_attr_undock); |
| device_remove_file(&dock_device->dev, &dev_attr_uid); |
| platform_device_unregister(dock_device); |
| kfree(dock_station); |
| dock_station = NULL; |
| return ret; |
| } |
| ret = device_create_file(&dock_device->dev, &dev_attr_type); |
| if (ret) |
| printk(KERN_ERR"Error %d adding sysfs file\n", ret); |
| |
| /* Find dependent devices */ |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| ACPI_UINT32_MAX, find_dock_devices, dock_station, |
| NULL); |
| |
| /* add the dock station as a device dependent on itself */ |
| dd = alloc_dock_dependent_device(handle); |
| if (!dd) { |
| kfree(dock_station); |
| dock_station = NULL; |
| ret = -ENOMEM; |
| goto dock_add_err_unregister; |
| } |
| add_dock_dependent_device(dock_station, dd); |
| |
| dock_station_count++; |
| list_add(&dock_station->sibiling, &dock_stations); |
| return 0; |
| |
| dock_add_err_unregister: |
| device_remove_file(&dock_device->dev, &dev_attr_type); |
| device_remove_file(&dock_device->dev, &dev_attr_docked); |
| device_remove_file(&dock_device->dev, &dev_attr_undock); |
| device_remove_file(&dock_device->dev, &dev_attr_uid); |
| device_remove_file(&dock_device->dev, &dev_attr_flags); |
| platform_device_unregister(dock_device); |
| kfree(dock_station); |
| dock_station = NULL; |
| return ret; |
| } |
| |
| /** |
| * dock_remove - free up resources related to the dock station |
| */ |
| static int dock_remove(struct dock_station *dock_station) |
| { |
| struct dock_dependent_device *dd, *tmp; |
| struct platform_device *dock_device = dock_station->dock_device; |
| |
| if (!dock_station_count) |
| return 0; |
| |
| /* remove dependent devices */ |
| list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, |
| list) |
| kfree(dd); |
| |
| /* cleanup sysfs */ |
| device_remove_file(&dock_device->dev, &dev_attr_type); |
| device_remove_file(&dock_device->dev, &dev_attr_docked); |
| device_remove_file(&dock_device->dev, &dev_attr_undock); |
| device_remove_file(&dock_device->dev, &dev_attr_uid); |
| device_remove_file(&dock_device->dev, &dev_attr_flags); |
| platform_device_unregister(dock_device); |
| |
| /* free dock station memory */ |
| kfree(dock_station); |
| dock_station = NULL; |
| return 0; |
| } |
| |
| /** |
| * find_dock - look for a dock station |
| * @handle: acpi handle of a device |
| * @lvl: unused |
| * @context: counter of dock stations found |
| * @rv: unused |
| * |
| * This is called by acpi_walk_namespace to look for dock stations. |
| */ |
| static acpi_status |
| find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| acpi_status status = AE_OK; |
| |
| if (is_dock(handle)) { |
| if (dock_add(handle) >= 0) { |
| status = AE_CTRL_TERMINATE; |
| } |
| } |
| return status; |
| } |
| |
| static acpi_status |
| find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| /* If bay is a dock, it's already handled */ |
| if (is_ejectable_bay(handle) && !is_dock(handle)) |
| dock_add(handle); |
| return AE_OK; |
| } |
| |
| static int __init dock_init(void) |
| { |
| if (acpi_disabled) |
| return 0; |
| |
| /* look for a dock station */ |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| ACPI_UINT32_MAX, find_dock, NULL, NULL); |
| |
| /* look for bay */ |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| ACPI_UINT32_MAX, find_bay, NULL, NULL); |
| if (!dock_station_count) { |
| printk(KERN_INFO PREFIX "No dock devices found.\n"); |
| return 0; |
| } |
| |
| register_acpi_bus_notifier(&dock_acpi_notifier); |
| printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", |
| ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); |
| return 0; |
| } |
| |
| static void __exit dock_exit(void) |
| { |
| struct dock_station *dock_station; |
| struct dock_station *tmp; |
| |
| unregister_acpi_bus_notifier(&dock_acpi_notifier); |
| list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibiling) |
| dock_remove(dock_station); |
| } |
| |
| /* |
| * Must be called before drivers of devices in dock, otherwise we can't know |
| * which devices are in a dock |
| */ |
| subsys_initcall(dock_init); |
| module_exit(dock_exit); |