path: root/drivers/acpi/dock.c

/*
 *  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 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<