Revert "ACPI: dock driver"

This reverts commit a5e1b94008f2a96abf4a0c0371a55a56b320c13e.

Adrian Bunk points out that it has build errors, and apparently no
maintenance. Throw it out.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 739 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
deleted file mode 100644
index 510a9452429..00000000000
--- a/drivers/acpi/dock.c
+++ /dev/null
@@ -1,739 +0,0 @@
-/*
- *  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 <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-
-#define ACPI_DOCK_DRIVER_NAME "ACPI Dock Station Driver"
-
-ACPI_MODULE_NAME("dock")
-MODULE_AUTHOR("Kristen Carlson Accardi");
-MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_NAME);
-MODULE_LICENSE("GPL");
-
-static struct atomic_notifier_head dock_notifier_list;
-
-struct dock_station {
-	acpi_handle handle;
-	unsigned long last_dock_time;
-	u32 flags;
-	spinlock_t dd_lock;
-	spinlock_t hp_lock;
-	struct list_head dependent_devices;
-	struct list_head hotplug_devices;
-};
-
-struct dock_dependent_device {
-	struct list_head list;
-	struct list_head hotplug_list;
-	acpi_handle handle;
-	acpi_notify_handler handler;
-	void *context;
-};
-
-#define DOCK_DOCKING	0x00000001
-#define DOCK_EVENT	KOBJ_DOCK
-#define UNDOCK_EVENT	KOBJ_UNDOCK
-
-static struct dock_station *dock_station;
-
-/*****************************************************************************
- *                         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)
-{
-	spin_lock(&ds->hp_lock);
-	list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
-	spin_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)
-{
-	spin_lock(&ds->hp_lock);
-	list_del(&dd->hotplug_list);
-	spin_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;
-}
-
-/**
- * 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)
-{
-	if (!dock_station)
-		return 0;
-
-	if (is_dock(handle) || 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 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;
-
-	spin_lock(&ds->hp_lock);
-
-	/*
-	 * First call driver specific hotplug functions
-	 */
-	list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) {
-		if (dd->handler)
-			dd->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);
-	}
-	spin_unlock(&ds->hp_lock);
-}
-
-static void dock_event(struct dock_station *ds, u32 event, int num)
-{
-	struct acpi_device *device;
-
-	device = dock_create_acpi_device(ds->handle);
-	if (device)
-		kobject_uevent(&device->kobj, num);
-}
-
-/**
- * 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 };
-	union acpi_object *obj;
-
-	acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer);
-	obj = name_buffer.pointer;
-
-	printk(KERN_INFO PREFIX "%s\n", 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))
-		pr_debug("%s: failed to execute _DCK\n", obj->string.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;
-}
-
-/**
- * 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)
-{
-	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)
-{
-	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
- * @handler: the acpi_notifier_handler 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, acpi_notify_handler handler,
-			     void *context)
-{
-	struct dock_dependent_device *dd;
-
-	if (!dock_station)
-		return -ENODEV;
-
-	/*
-	 * make sure this handle is for a device dependent on the dock,
-	 * this would include the dock station itself
-	 */
-	dd = find_dock_dependent_device(dock_station, handle);
-	if (dd) {
-		dd->handler = handler;
-		dd->context = context;
-		dock_add_hotplug_device(dock_station, dd);
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-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;
-
-	if (!dock_station)
-		return;
-
-	dd = find_dock_dependent_device(dock_station, handle);
-	if (dd)
-		dock_del_hotplug_device(dock_station, dd);
-}
-
-EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
-
-/**
- * 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.  For undock
- * check to make sure the dock device is still present, then undock
- * and hotremove all the devices that may need removing.
- */
-static void dock_notify(acpi_handle handle, u32 event, void *data)
-{
-	struct dock_station *ds = (struct dock_station *)data;
-
-	switch (event) {
-	case ACPI_NOTIFY_BUS_CHECK:
-		if (!dock_in_progress(ds) && dock_present(ds)) {
-			begin_dock(ds);
-			dock(ds);
-			if (!dock_present(ds)) {
-				printk(KERN_ERR PREFIX "Unable to dock!\n");
-				break;
-			}
-			atomic_notifier_call_chain(&dock_notifier_list,
-						   event, NULL);
-			hotplug_dock_devices(ds, event);
-			complete_dock(ds);
-			dock_event(ds, event, DOCK_EVENT);
-		}
-		break;
-	case ACPI_NOTIFY_DEVICE_CHECK:
-	/*
-         * 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.  This notify routine will only be called
-         * for objects defining _DCK, so we will fall through to eject
-         * request here.  However, we will pass an eject request through
-	 * to the driver who wish to hotplug.
-         */
-	case ACPI_NOTIFY_EJECT_REQUEST:
-		if (!dock_in_progress(ds) && dock_present(ds)) {
-			/*
-			 * here we need to generate the undock
-			 * event prior to actually doing the undock
-			 * so that the device struct still exists.
-			 */
-			dock_event(ds, event, UNDOCK_EVENT);
-			hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
-			undock(ds);
-			eject_dock(ds);
-			if (dock_present(ds))
-				printk(KERN_ERR PREFIX "Unable to undock!\n");
-		}
-		break;
-	default:
-		printk(KERN_ERR PREFIX "Unknown dock event %d\n", event);
-	}
-}
-
-/**
- * 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;
-	struct dock_station *ds = (struct dock_station *)context;
-	struct dock_dependent_device *dd;
-
-	status = acpi_bus_get_ejd(handle, &tmp);
-	if (ACPI_FAILURE(status))
-		return AE_OK;
-
-	if (tmp == ds->handle) {
-		dd = alloc_dock_dependent_device(handle);
-		if (dd)
-			add_dock_dependent_device(ds, dd);
-	}
-
-	return AE_OK;
-}
-
-/**
- * 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;
-	acpi_status status;
-	struct dock_dependent_device *dd;
-
-	/* 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);
-	spin_lock_init(&dock_station->dd_lock);
-	spin_lock_init(&dock_station->hp_lock);
-
-	/* 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);
-		return -ENOMEM;
-	}
-	add_dock_dependent_device(dock_station, dd);
-
-	/* register for dock events */
-	status = acpi_install_notify_handler(dock_station->handle,
-					     ACPI_SYSTEM_NOTIFY,
-					     dock_notify, dock_station);
-
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR PREFIX "Error installing notify handler\n");
-		ret = -ENODEV;
-		goto dock_add_err;
-	}
-
-	printk(KERN_INFO PREFIX "%s \n", ACPI_DOCK_DRIVER_NAME);
-
-	return 0;
-
-dock_add_err:
-	kfree(dock_station);
-	kfree(dd);
-	return ret;
-}
-
-/**
- * dock_remove - free up resources related to the dock station
- */
-static int dock_remove(void)
-{
-	struct dock_dependent_device *dd, *tmp;
-	acpi_status status;
-
-	if (!dock_station)
-		return 0;
-
-	/* remove dependent devices */
-	list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices,
-				 list)
-	    kfree(dd);
-
-	/* remove dock notify handler */
-	status = acpi_remove_notify_handler(dock_station->handle,
-					    ACPI_SYSTEM_NOTIFY,
-					    dock_notify);
-	if (ACPI_FAILURE(status))
-		printk(KERN_ERR "Error removing notify handler\n");
-
-	/* free dock station memory */
-	kfree(dock_station);
-	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)
-{
-	int *count = (int *)context;
-	acpi_status status = AE_OK;
-
-	if (is_dock(handle)) {
-		if (dock_add(handle) >= 0) {
-			(*count)++;
-			status = AE_CTRL_TERMINATE;
-		}
-	}
-	return status;
-}
-
-static int __init dock_init(void)
-{
-	int num = 0;
-
-	dock_station = NULL;
-
-	/* look for a dock station */
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX, find_dock, &num, NULL);
-
-	if (!num)
-		return -ENODEV;
-
-	return 0;
-}
-
-static void __exit dock_exit(void)
-{
-	dock_remove();
-}
-
-postcore_initcall(dock_init);
-module_exit(dock_exit);