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3757b94802
This changeset is aimed at fixing a few different but related problems in the ACPI hotplug infrastructure. First of all, since notify handlers may be run in parallel with acpi_bus_scan(), acpi_bus_trim() and acpi_bus_hot_remove_device() and some of them are installed for ACPI handles that have no struct acpi_device objects attached (i.e. before those objects are created), those notify handlers have to take acpi_scan_lock to prevent races from taking place (e.g. a struct acpi_device is found to be present for the given ACPI handle, but right after that it is removed by acpi_bus_trim() running in parallel to the given notify handler). Moreover, since some of them call acpi_bus_scan() and acpi_bus_trim(), this leads to the conclusion that acpi_scan_lock should be acquired by the callers of these two funtions rather by these functions themselves. For these reasons, make all notify handlers that can handle device addition and eject events take acpi_scan_lock and remove the acpi_scan_lock locking from acpi_bus_scan() and acpi_bus_trim(). Accordingly, update all of their users to make sure that they are always called under acpi_scan_lock. Furthermore, since eject operations are carried out asynchronously with respect to the notify events that trigger them, with the help of acpi_bus_hot_remove_device(), even if notify handlers take the ACPI scan lock, it still is possible that, for example, acpi_bus_trim() will run between acpi_bus_hot_remove_device() and the notify handler that scheduled its execution and that acpi_bus_trim() will remove the device node passed to acpi_bus_hot_remove_device() for ejection. In that case, the struct acpi_device object obtained by acpi_bus_hot_remove_device() will be invalid and not-so-funny things will ensue. To protect agaist that, make the users of acpi_bus_hot_remove_device() run get_device() on ACPI device node objects that are about to be passed to it and make acpi_bus_hot_remove_device() run put_device() on them and check if their ACPI handles are not NULL (make acpi_device_unregister() clear the device nodes' ACPI handles for that check to work). Finally, observe that acpi_os_hotplug_execute() actually can fail, in which case its caller ought to free memory allocated for the context object to prevent leaks from happening. It also needs to run put_device() on the device node that it ran get_device() on previously in that case. Modify the code accordingly. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Yinghai Lu <yinghai@kernel.org>
1071 lines
27 KiB
C
1071 lines
27 KiB
C
/*
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* dock.c - ACPI dock station driver
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*
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* Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include <linux/jiffies.h>
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#include <linux/stddef.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define PREFIX "ACPI: "
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#define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver"
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ACPI_MODULE_NAME("dock");
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MODULE_AUTHOR("Kristen Carlson Accardi");
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MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION);
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MODULE_LICENSE("GPL");
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static bool immediate_undock = 1;
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module_param(immediate_undock, bool, 0644);
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MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
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"undock immediately when the undock button is pressed, 0 will cause"
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" the driver to wait for userspace to write the undock sysfs file "
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" before undocking");
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static struct atomic_notifier_head dock_notifier_list;
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static const struct acpi_device_id dock_device_ids[] = {
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{"LNXDOCK", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, dock_device_ids);
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struct dock_station {
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acpi_handle handle;
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unsigned long last_dock_time;
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u32 flags;
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spinlock_t dd_lock;
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struct mutex hp_lock;
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struct list_head dependent_devices;
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struct list_head hotplug_devices;
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struct list_head sibling;
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struct platform_device *dock_device;
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};
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static LIST_HEAD(dock_stations);
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static int dock_station_count;
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struct dock_dependent_device {
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struct list_head list;
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struct list_head hotplug_list;
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acpi_handle handle;
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const struct acpi_dock_ops *ops;
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void *context;
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};
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#define DOCK_DOCKING 0x00000001
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#define DOCK_UNDOCKING 0x00000002
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#define DOCK_IS_DOCK 0x00000010
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#define DOCK_IS_ATA 0x00000020
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#define DOCK_IS_BAT 0x00000040
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#define DOCK_EVENT 3
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#define UNDOCK_EVENT 2
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/*****************************************************************************
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* Dock Dependent device functions *
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*****************************************************************************/
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/**
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* add_dock_dependent_device - associate a device with the dock station
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* @ds: The dock station
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* @handle: handle of the dependent device
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*
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* Add the dependent device to the dock's dependent device list.
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*/
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static int
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add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
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{
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struct dock_dependent_device *dd;
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dd = kzalloc(sizeof(*dd), GFP_KERNEL);
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if (!dd)
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return -ENOMEM;
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dd->handle = handle;
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INIT_LIST_HEAD(&dd->list);
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INIT_LIST_HEAD(&dd->hotplug_list);
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spin_lock(&ds->dd_lock);
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list_add_tail(&dd->list, &ds->dependent_devices);
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spin_unlock(&ds->dd_lock);
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return 0;
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}
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/**
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* dock_add_hotplug_device - associate a hotplug handler with the dock station
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* @ds: The dock station
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* @dd: The dependent device struct
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*
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* Add the dependent device to the dock's hotplug device list
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*/
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static void
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dock_add_hotplug_device(struct dock_station *ds,
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struct dock_dependent_device *dd)
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{
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mutex_lock(&ds->hp_lock);
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list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
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mutex_unlock(&ds->hp_lock);
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}
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/**
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* dock_del_hotplug_device - remove a hotplug handler from the dock station
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* @ds: The dock station
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* @dd: the dependent device struct
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*
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* Delete the dependent device from the dock's hotplug device list
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*/
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static void
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dock_del_hotplug_device(struct dock_station *ds,
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struct dock_dependent_device *dd)
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{
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mutex_lock(&ds->hp_lock);
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list_del(&dd->hotplug_list);
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mutex_unlock(&ds->hp_lock);
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}
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/**
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* find_dock_dependent_device - get a device dependent on this dock
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* @ds: the dock station
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* @handle: the acpi_handle of the device we want
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*
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* iterate over the dependent device list for this dock. If the
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* dependent device matches the handle, return.
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*/
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static struct dock_dependent_device *
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find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
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{
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struct dock_dependent_device *dd;
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spin_lock(&ds->dd_lock);
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list_for_each_entry(dd, &ds->dependent_devices, list) {
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if (handle == dd->handle) {
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spin_unlock(&ds->dd_lock);
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return dd;
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}
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}
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spin_unlock(&ds->dd_lock);
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return NULL;
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}
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/*****************************************************************************
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* Dock functions *
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*****************************************************************************/
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/**
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* is_dock - see if a device is a dock station
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* @handle: acpi handle of the device
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*
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* If an acpi object has a _DCK method, then it is by definition a dock
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* station, so return true.
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*/
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static int is_dock(acpi_handle handle)
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{
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acpi_status status;
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acpi_handle tmp;
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status = acpi_get_handle(handle, "_DCK", &tmp);
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if (ACPI_FAILURE(status))
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return 0;
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return 1;
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}
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static int is_ejectable(acpi_handle handle)
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{
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acpi_status status;
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acpi_handle tmp;
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status = acpi_get_handle(handle, "_EJ0", &tmp);
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if (ACPI_FAILURE(status))
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return 0;
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return 1;
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}
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static int is_ata(acpi_handle handle)
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{
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acpi_handle tmp;
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if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
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(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
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return 1;
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return 0;
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}
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static int is_battery(acpi_handle handle)
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{
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struct acpi_device_info *info;
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int ret = 1;
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if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info)))
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return 0;
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if (!(info->valid & ACPI_VALID_HID))
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ret = 0;
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else
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ret = !strcmp("PNP0C0A", info->hardware_id.string);
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kfree(info);
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return ret;
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}
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static int is_ejectable_bay(acpi_handle handle)
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{
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acpi_handle phandle;
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if (!is_ejectable(handle))
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return 0;
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if (is_battery(handle) || is_ata(handle))
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return 1;
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if (!acpi_get_parent(handle, &phandle) && is_ata(phandle))
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return 1;
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return 0;
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}
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/**
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* is_dock_device - see if a device is on a dock station
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* @handle: acpi handle of the device
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*
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* If this device is either the dock station itself,
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* or is a device dependent on the dock station, then it
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* is a dock device
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*/
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int is_dock_device(acpi_handle handle)
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{
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struct dock_station *dock_station;
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if (!dock_station_count)
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return 0;
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if (is_dock(handle))
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return 1;
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list_for_each_entry(dock_station, &dock_stations, sibling)
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if (find_dock_dependent_device(dock_station, handle))
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return 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(is_dock_device);
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/**
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* dock_present - see if the dock station is present.
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* @ds: the dock station
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*
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* execute the _STA method. note that present does not
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* imply that we are docked.
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*/
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static int dock_present(struct dock_station *ds)
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{
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unsigned long long sta;
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acpi_status status;
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if (ds) {
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status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta);
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if (ACPI_SUCCESS(status) && sta)
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return 1;
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}
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return 0;
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}
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/**
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* dock_create_acpi_device - add new devices to acpi
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* @handle - handle of the device to add
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*
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* This function will create a new acpi_device for the given
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* handle if one does not exist already. This should cause
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* acpi to scan for drivers for the given devices, and call
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* matching driver's add routine.
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*
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* Returns a pointer to the acpi_device corresponding to the handle.
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*/
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static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
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{
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struct acpi_device *device;
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int ret;
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if (acpi_bus_get_device(handle, &device)) {
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/*
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* no device created for this object,
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* so we should create one.
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*/
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ret = acpi_bus_scan(handle);
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if (ret)
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pr_debug("error adding bus, %x\n", -ret);
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acpi_bus_get_device(handle, &device);
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}
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return device;
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}
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/**
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* dock_remove_acpi_device - remove the acpi_device struct from acpi
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* @handle - the handle of the device to remove
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*
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* Tell acpi to remove the acpi_device. This should cause any loaded
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* driver to have it's remove routine called.
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*/
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static void dock_remove_acpi_device(acpi_handle handle)
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{
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struct acpi_device *device;
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if (!acpi_bus_get_device(handle, &device))
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acpi_bus_trim(device);
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}
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/**
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* hotplug_dock_devices - insert or remove devices on the dock station
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* @ds: the dock station
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* @event: either bus check or eject request
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*
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* Some devices on the dock station need to have drivers called
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* to perform hotplug operations after a dock event has occurred.
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* Traverse the list of dock devices that have registered a
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* hotplug handler, and call the handler.
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*/
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static void hotplug_dock_devices(struct dock_station *ds, u32 event)
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{
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struct dock_dependent_device *dd;
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mutex_lock(&ds->hp_lock);
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/*
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* First call driver specific hotplug functions
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*/
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list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
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if (dd->ops && dd->ops->handler)
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dd->ops->handler(dd->handle, event, dd->context);
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/*
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* Now make sure that an acpi_device is created for each
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* dependent device, or removed if this is an eject request.
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* This will cause acpi_drivers to be stopped/started if they
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* exist
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*/
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list_for_each_entry(dd, &ds->dependent_devices, list) {
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if (event == ACPI_NOTIFY_EJECT_REQUEST)
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dock_remove_acpi_device(dd->handle);
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else
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dock_create_acpi_device(dd->handle);
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}
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mutex_unlock(&ds->hp_lock);
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}
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static void dock_event(struct dock_station *ds, u32 event, int num)
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{
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struct device *dev = &ds->dock_device->dev;
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char event_string[13];
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char *envp[] = { event_string, NULL };
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struct dock_dependent_device *dd;
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if (num == UNDOCK_EVENT)
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sprintf(event_string, "EVENT=undock");
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else
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sprintf(event_string, "EVENT=dock");
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/*
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* Indicate that the status of the dock station has
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* changed.
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*/
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if (num == DOCK_EVENT)
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kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
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list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
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if (dd->ops && dd->ops->uevent)
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dd->ops->uevent(dd->handle, event, dd->context);
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if (num != DOCK_EVENT)
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kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
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}
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/**
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* eject_dock - respond to a dock eject request
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* @ds: the dock station
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*
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* This is called after _DCK is called, to execute the dock station's
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* _EJ0 method.
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*/
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static void eject_dock(struct dock_station *ds)
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{
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struct acpi_object_list arg_list;
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union acpi_object arg;
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acpi_status status;
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acpi_handle tmp;
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/* all dock devices should have _EJ0, but check anyway */
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status = acpi_get_handle(ds->handle, "_EJ0", &tmp);
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if (ACPI_FAILURE(status)) {
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pr_debug("No _EJ0 support for dock device\n");
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return;
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}
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = 1;
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status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL);
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if (ACPI_FAILURE(status))
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pr_debug("Failed to evaluate _EJ0!\n");
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}
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/**
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* handle_dock - handle a dock event
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* @ds: the dock station
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* @dock: to dock, or undock - that is the question
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*
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* Execute the _DCK method in response to an acpi event
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*/
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static void handle_dock(struct dock_station *ds, int dock)
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{
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acpi_status status;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking");
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/* _DCK method has one argument */
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = dock;
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status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n",
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status);
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kfree(buffer.pointer);
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}
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static inline void dock(struct dock_station *ds)
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{
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handle_dock(ds, 1);
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}
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static inline void undock(struct dock_station *ds)
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{
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handle_dock(ds, 0);
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}
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static inline void begin_dock(struct dock_station *ds)
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{
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ds->flags |= DOCK_DOCKING;
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}
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static inline void complete_dock(struct dock_station *ds)
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{
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ds->flags &= ~(DOCK_DOCKING);
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ds->last_dock_time = jiffies;
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}
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static inline void begin_undock(struct dock_station *ds)
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{
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ds->flags |= DOCK_UNDOCKING;
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}
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static inline void complete_undock(struct dock_station *ds)
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|
{
|
|
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)
|
|
acpi_handle_warn(ds->handle,
|
|
"Locking device failed (0x%x)\n", status);
|
|
else
|
|
acpi_handle_warn(ds->handle,
|
|
"Unlocking device failed (0x%x)\n", status);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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, const 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, sibling) {
|
|
/*
|
|
* An ATA bay can be in a dock and itself can be ejected
|
|
* separately, 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, sibling) {
|
|
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)) {
|
|
acpi_handle_err(ds->handle, "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)) {
|
|
acpi_handle_err(handle, "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);
|
|
acpi_update_all_gpes();
|
|
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:
|
|
acpi_handle_err(handle, "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 = context;
|
|
|
|
acpi_scan_lock_acquire();
|
|
dock_notify(data->handle, data->event, data->ds);
|
|
acpi_scan_lock_release();
|
|
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 = data;
|
|
|
|
if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
|
|
&& event != ACPI_NOTIFY_EJECT_REQUEST)
|
|
return 0;
|
|
|
|
acpi_scan_lock_acquire();
|
|
|
|
list_for_each_entry(dock_station, &dock_stations, sibling) {
|
|
if (dock_station->handle == handle) {
|
|
struct dock_data *dd;
|
|
acpi_status status;
|
|
|
|
dd = kmalloc(sizeof(*dd), GFP_KERNEL);
|
|
if (!dd)
|
|
break;
|
|
|
|
dd->handle = handle;
|
|
dd->event = event;
|
|
dd->ds = dock_station;
|
|
status = acpi_os_hotplug_execute(acpi_dock_deferred_cb,
|
|
dd);
|
|
if (ACPI_FAILURE(status))
|
|
kfree(dd);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
acpi_scan_lock_release();
|
|
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;
|
|
|
|
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)
|
|
add_dock_dependent_device(ds, handle);
|
|
|
|
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 = dev->platform_data;
|
|
|
|
if (!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 = 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 = 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 = 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 = 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);
|
|
|
|
static struct attribute *dock_attributes[] = {
|
|
&dev_attr_docked.attr,
|
|
&dev_attr_flags.attr,
|
|
&dev_attr_undock.attr,
|
|
&dev_attr_uid.attr,
|
|
&dev_attr_type.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group dock_attribute_group = {
|
|
.attrs = dock_attributes
|
|
};
|
|
|
|
/**
|
|
* 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 __init dock_add(acpi_handle handle)
|
|
{
|
|
int ret, id;
|
|
struct dock_station ds, *dock_station;
|
|
struct platform_device *dd;
|
|
|
|
id = dock_station_count;
|
|
memset(&ds, 0, sizeof(ds));
|
|
dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds));
|
|
if (IS_ERR(dd))
|
|
return PTR_ERR(dd);
|
|
|
|
dock_station = dd->dev.platform_data;
|
|
|
|
dock_station->handle = handle;
|
|
dock_station->dock_device = dd;
|
|
dock_station->last_dock_time = jiffies - HZ;
|
|
|
|
mutex_init(&dock_station->hp_lock);
|
|
spin_lock_init(&dock_station->dd_lock);
|
|
INIT_LIST_HEAD(&dock_station->sibling);
|
|
INIT_LIST_HEAD(&dock_station->hotplug_devices);
|
|
ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
|
|
INIT_LIST_HEAD(&dock_station->dependent_devices);
|
|
|
|
/* we want the dock device to send uevents */
|
|
dev_set_uevent_suppress(&dd->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 = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group);
|
|
if (ret)
|
|
goto err_unregister;
|
|
|
|
/* Find dependent devices */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_dock_devices, NULL,
|
|
dock_station, NULL);
|
|
|
|
/* add the dock station as a device dependent on itself */
|
|
ret = add_dock_dependent_device(dock_station, handle);
|
|
if (ret)
|
|
goto err_rmgroup;
|
|
|
|
dock_station_count++;
|
|
list_add(&dock_station->sibling, &dock_stations);
|
|
return 0;
|
|
|
|
err_rmgroup:
|
|
sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group);
|
|
err_unregister:
|
|
platform_device_unregister(dd);
|
|
acpi_handle_err(handle, "%s encountered error %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* dock_remove - free up resources related to the dock station
|
|
*/
|
|
static int dock_remove(struct dock_station *ds)
|
|
{
|
|
struct dock_dependent_device *dd, *tmp;
|
|
struct platform_device *dock_device = ds->dock_device;
|
|
|
|
if (!dock_station_count)
|
|
return 0;
|
|
|
|
/* remove dependent devices */
|
|
list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list)
|
|
kfree(dd);
|
|
|
|
list_del(&ds->sibling);
|
|
|
|
/* cleanup sysfs */
|
|
sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
|
|
platform_device_unregister(dock_device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* find_dock_and_bay - look for dock stations and bays
|
|
* @handle: acpi handle of a device
|
|
* @lvl: unused
|
|
* @context: unused
|
|
* @rv: unused
|
|
*
|
|
* This is called by acpi_walk_namespace to look for dock stations and bays.
|
|
*/
|
|
static __init acpi_status
|
|
find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
if (is_dock(handle) || is_ejectable_bay(handle))
|
|
dock_add(handle);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int __init dock_init(void)
|
|
{
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
/* look for dock stations and bays */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_dock_and_bay, NULL, NULL, NULL);
|
|
|
|
if (!dock_station_count) {
|
|
pr_info(PREFIX "No dock devices found.\n");
|
|
return 0;
|
|
}
|
|
|
|
register_acpi_bus_notifier(&dock_acpi_notifier);
|
|
pr_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 *tmp, *dock_station;
|
|
|
|
unregister_acpi_bus_notifier(&dock_acpi_notifier);
|
|
list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling)
|
|
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);
|