Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 805 insertions, 0 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
new file mode 100644
index 00000000..0500f719
--- /dev/null
+++ b/drivers/acpi/power.c
@@ -0,0 +1,805 @@
+/*
+ *  acpi_power.c - ACPI Bus Power Management ($Revision: 39 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+/*
+ * ACPI power-managed devices may be controlled in two ways:
+ * 1. via "Device Specific (D-State) Control"
+ * 2. via "Power Resource Control".
+ * This module is used to manage devices relying on Power Resource Control.
+ * 
+ * An ACPI "power resource object" describes a software controllable power
+ * plane, clock plane, or other resource used by a power managed device.
+ * A device may rely on multiple power resources, and a power resource
+ * may be shared by multiple devices.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include "sleep.h"
+#include "internal.h"
+
+#define PREFIX "ACPI: "
+
+#define _COMPONENT			ACPI_POWER_COMPONENT
+ACPI_MODULE_NAME("power");
+#define ACPI_POWER_CLASS		"power_resource"
+#define ACPI_POWER_DEVICE_NAME		"Power Resource"
+#define ACPI_POWER_FILE_INFO		"info"
+#define ACPI_POWER_FILE_STATUS		"state"
+#define ACPI_POWER_RESOURCE_STATE_OFF	0x00
+#define ACPI_POWER_RESOURCE_STATE_ON	0x01
+#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
+
+static int acpi_power_add(struct acpi_device *device);
+static int acpi_power_remove(struct acpi_device *device, int type);
+static int acpi_power_resume(struct acpi_device *device);
+
+static const struct acpi_device_id power_device_ids[] = {
+	{ACPI_POWER_HID, 0},
+	{"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, power_device_ids);
+
+static struct acpi_driver acpi_power_driver = {
+	.name = "power",
+	.class = ACPI_POWER_CLASS,
+	.ids = power_device_ids,
+	.ops = {
+		.add = acpi_power_add,
+		.remove = acpi_power_remove,
+		.resume = acpi_power_resume,
+		},
+};
+
+/*
+ * A power managed device
+ * A device may rely on multiple power resources.
+ * */
+struct acpi_power_managed_device {
+	struct device *dev; /* The physical device */
+	acpi_handle *handle;
+};
+
+struct acpi_power_resource_device {
+	struct acpi_power_managed_device *device;
+	struct acpi_power_resource_device *next;
+};
+
+struct acpi_power_resource {
+	struct acpi_device * device;
+	acpi_bus_id name;
+	u32 system_level;
+	u32 order;
+	unsigned int ref_count;
+	struct mutex resource_lock;
+
+	/* List of devices relying on this power resource */
+	struct acpi_power_resource_device *devices;
+};
+
+static struct list_head acpi_power_resource_list;
+
+/* --------------------------------------------------------------------------
+                             Power Resource Management
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_power_get_context(acpi_handle handle,
+		       struct acpi_power_resource **resource)
+{
+	int result = 0;
+	struct acpi_device *device = NULL;
+
+
+	if (!resource)
+		return -ENODEV;
+
+	result = acpi_bus_get_device(handle, &device);
+	if (result) {
+		printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
+		return result;
+	}
+
+	*resource = acpi_driver_data(device);
+	if (!*resource)
+		return -ENODEV;
+
+	return 0;
+}
+
+static int acpi_power_get_state(acpi_handle handle, int *state)
+{
+	acpi_status status = AE_OK;
+	unsigned long long sta = 0;
+	char node_name[5];
+	struct acpi_buffer buffer = { sizeof(node_name), node_name };
+
+
+	if (!handle || !state)
+		return -EINVAL;
+
+	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	*state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
+			      ACPI_POWER_RESOURCE_STATE_OFF;
+
+	acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
+			  node_name,
+				*state ? "on" : "off"));
+
+	return 0;
+}
+
+static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
+{
+	int cur_state;
+	int i = 0;
+
+	if (!list || !state)
+		return -EINVAL;
+
+	/* The state of the list is 'on' IFF all resources are 'on'. */
+
+	for (i = 0; i < list->count; i++) {
+		struct acpi_power_resource *resource;
+		acpi_handle handle = list->handles[i];
+		int result;
+
+		result = acpi_power_get_context(handle, &resource);
+		if (result)
+			return result;
+
+		mutex_lock(&resource->resource_lock);
+
+		result = acpi_power_get_state(handle, &cur_state);
+
+		mutex_unlock(&resource->resource_lock);
+
+		if (result)
+			return result;
+
+		if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
+			break;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
+			  cur_state ? "on" : "off"));
+
+	*state = cur_state;
+
+	return 0;
+}
+
+/* Resume the device when all power resources in _PR0 are on */
+static void acpi_power_on_device(struct acpi_power_managed_device *device)
+{
+	struct acpi_device *acpi_dev;
+	acpi_handle handle = device->handle;
+	int state;
+
+	if (acpi_bus_get_device(handle, &acpi_dev))
+		return;
+
+	if(acpi_power_get_inferred_state(acpi_dev, &state))
+		return;
+
+	if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
+		pm_request_resume(device->dev);
+}
+
+static int __acpi_power_on(struct acpi_power_resource *resource)
+{
+	struct acpi_power_resource_device *device_list = resource->devices;
+	acpi_status status = AE_OK;
+
+	status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	/* Update the power resource's _device_ power state */
+	resource->device->power.state = ACPI_STATE_D0;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
+			  resource->name));
+
+	while (device_list) {
+		acpi_power_on_device(device_list->device);
+
+		device_list = device_list->next;
+	}
+
+	return 0;
+}
+
+static int acpi_power_on(acpi_handle handle)
+{
+	int result = 0;
+	struct acpi_power_resource *resource = NULL;
+
+	result = acpi_power_get_context(handle, &resource);
+	if (result)
+		return result;
+
+	mutex_lock(&resource->resource_lock);
+
+	if (resource->ref_count++) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Power resource [%s] already on",
+				  resource->name));
+	} else {
+		result = __acpi_power_on(resource);
+		if (result)
+			resource->ref_count--;
+	}
+
+	mutex_unlock(&resource->resource_lock);
+
+	return result;
+}
+
+static int acpi_power_off(acpi_handle handle)
+{
+	int result = 0;
+	acpi_status status = AE_OK;
+	struct acpi_power_resource *resource = NULL;
+
+	result = acpi_power_get_context(handle, &resource);
+	if (result)
+		return result;
+
+	mutex_lock(&resource->resource_lock);
+
+	if (!resource->ref_count) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Power resource [%s] already off",
+				  resource->name));
+		goto unlock;
+	}
+
+	if (--resource->ref_count) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Power resource [%s] still in use\n",
+				  resource->name));
+		goto unlock;
+	}
+
+	status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
+	if (ACPI_FAILURE(status)) {
+		result = -ENODEV;
+	} else {
+		/* Update the power resource's _device_ power state */
+		resource->device->power.state = ACPI_STATE_D3;
+
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Power resource [%s] turned off\n",
+				  resource->name));
+	}
+
+ unlock:
+	mutex_unlock(&resource->resource_lock);
+
+	return result;
+}
+
+static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
+{
+	int i;
+
+	for (i = num_res - 1; i >= 0 ; i--)
+		acpi_power_off(list->handles[i]);
+}
+
+static void acpi_power_off_list(struct acpi_handle_list *list)
+{
+	__acpi_power_off_list(list, list->count);
+}
+
+static int acpi_power_on_list(struct acpi_handle_list *list)
+{
+	int result = 0;
+	int i;
+
+	for (i = 0; i < list->count; i++) {
+		result = acpi_power_on(list->handles[i]);
+		if (result) {
+			__acpi_power_off_list(list, i);
+			break;
+		}
+	}
+
+	return result;
+}
+
+static void __acpi_power_resource_unregister_device(struct device *dev,
+		acpi_handle res_handle)
+{
+	struct acpi_power_resource *resource = NULL;
+	struct acpi_power_resource_device *prev, *curr;
+
+	if (acpi_power_get_context(res_handle, &resource))
+		return;
+
+	mutex_lock(&resource->resource_lock);
+	prev = NULL;
+	curr = resource->devices;
+	while (curr) {
+		if (curr->device->dev == dev) {
+			if (!prev)
+				resource->devices = curr->next;
+			else
+				prev->next = curr->next;
+
+			kfree(curr);
+			break;
+		}
+
+		prev = curr;
+		curr = curr->next;
+	}
+	mutex_unlock(&resource->resource_lock);
+}
+
+/* Unlink dev from all power resources in _PR0 */
+void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle)
+{
+	struct acpi_device *acpi_dev;
+	struct acpi_handle_list *list;
+	int i;
+
+	if (!dev || !handle)
+		return;
+
+	if (acpi_bus_get_device(handle, &acpi_dev))
+		return;
+
+	list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+
+	for (i = 0; i < list->count; i++)
+		__acpi_power_resource_unregister_device(dev,
+			list->handles[i]);
+}
+
+static int __acpi_power_resource_register_device(
+	struct acpi_power_managed_device *powered_device, acpi_handle handle)
+{
+	struct acpi_power_resource *resource = NULL;
+	struct acpi_power_resource_device *power_resource_device;
+	int result;
+
+	result = acpi_power_get_context(handle, &resource);
+	if (result)
+		return result;
+
+	power_resource_device = kzalloc(
+		sizeof(*power_resource_device), GFP_KERNEL);
+	if (!power_resource_device)
+		return -ENOMEM;
+
+	power_resource_device->device = powered_device;
+
+	mutex_lock(&resource->resource_lock);
+	power_resource_device->next = resource->devices;
+	resource->devices = power_resource_device;
+	mutex_unlock(&resource->resource_lock);
+
+	return 0;
+}
+
+/* Link dev to all power resources in _PR0 */
+int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
+{
+	struct acpi_device *acpi_dev;
+	struct acpi_handle_list *list;
+	struct acpi_power_managed_device *powered_device;
+	int i, ret;
+
+	if (!dev || !handle)
+		return -ENODEV;
+
+	ret = acpi_bus_get_device(handle, &acpi_dev);
+	if (ret)
+		goto no_power_resource;
+
+	if (!acpi_dev->power.flags.power_resources)
+		goto no_power_resource;
+
+	powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
+	if (!powered_device)
+		return -ENOMEM;
+
+	powered_device->dev = dev;
+	powered_device->handle = handle;
+
+	list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
+
+	for (i = 0; i < list->count; i++) {
+		ret = __acpi_power_resource_register_device(powered_device,
+			list->handles[i]);
+
+		if (ret) {
+			acpi_power_resource_unregister_device(dev, handle);
+			break;
+		}
+	}
+
+	return ret;
+
+no_power_resource:
+	printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
+	return -ENODEV;
+}
+
+/**
+ * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
+ *                          ACPI 3.0) _PSW (Power State Wake)
+ * @dev: Device to handle.
+ * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
+ * @sleep_state: Target sleep state of the system.
+ * @dev_state: Target power state of the device.
+ *
+ * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ * State Wake) for the device, if present.  On failure reset the device's
+ * wakeup.flags.valid flag.
+ *
+ * RETURN VALUE:
+ * 0 if either _DSW or _PSW has been successfully executed
+ * 0 if neither _DSW nor _PSW has been found
+ * -ENODEV if the execution of either _DSW or _PSW has failed
+ */
+int acpi_device_sleep_wake(struct acpi_device *dev,
+                           int enable, int sleep_state, int dev_state)
+{
+	union acpi_object in_arg[3];
+	struct acpi_object_list arg_list = { 3, in_arg };
+	acpi_status status = AE_OK;
+
+	/*
+	 * Try to execute _DSW first.
+	 *
+	 * Three agruments are needed for the _DSW object:
+	 * Argument 0: enable/disable the wake capabilities
+	 * Argument 1: target system state
+	 * Argument 2: target device state
+	 * When _DSW object is called to disable the wake capabilities, maybe
+	 * the first argument is filled. The values of the other two agruments
+	 * are meaningless.
+	 */
+	in_arg[0].type = ACPI_TYPE_INTEGER;
+	in_arg[0].integer.value = enable;
+	in_arg[1].type = ACPI_TYPE_INTEGER;
+	in_arg[1].integer.value = sleep_state;
+	in_arg[2].type = ACPI_TYPE_INTEGER;
+	in_arg[2].integer.value = dev_state;
+	status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
+	if (ACPI_SUCCESS(status)) {
+		return 0;
+	} else if (status != AE_NOT_FOUND) {
+		printk(KERN_ERR PREFIX "_DSW execution failed\n");
+		dev->wakeup.flags.valid = 0;
+		return -ENODEV;
+	}
+
+	/* Execute _PSW */
+	arg_list.count = 1;
+	in_arg[0].integer.value = enable;
+	status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+		printk(KERN_ERR PREFIX "_PSW execution failed\n");
+		dev->wakeup.flags.valid = 0;
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
+ * 1. Power on the power resources required for the wakeup device 
+ * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
+ */
+int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
+{
+	int i, err = 0;
+
+	if (!dev || !dev->wakeup.flags.valid)
+		return -EINVAL;
+
+	mutex_lock(&acpi_device_lock);
+
+	if (dev->wakeup.prepare_count++)
+		goto out;
+
+	/* Open power resource */
+	for (i = 0; i < dev->wakeup.resources.count; i++) {
+		int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
+		if (ret) {
+			printk(KERN_ERR PREFIX "Transition power state\n");
+			dev->wakeup.flags.valid = 0;
+			err = -ENODEV;
+			goto err_out;
+		}
+	}
+
+	/*
+	 * Passing 3 as the third argument below means the device may be placed
+	 * in arbitrary power state afterwards.
+	 */
+	err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+
+ err_out:
+	if (err)
+		dev->wakeup.prepare_count = 0;
+
+ out:
+	mutex_unlock(&acpi_device_lock);
+	return err;
+}
+
+/*
+ * Shutdown a wakeup device, counterpart of above method
+ * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
+ * 2. Shutdown down the power resources
+ */
+int acpi_disable_wakeup_device_power(struct acpi_device *dev)
+{
+	int i, err = 0;
+
+	if (!dev || !dev->wakeup.flags.valid)
+		return -EINVAL;
+
+	mutex_lock(&acpi_device_lock);
+
+	if (--dev->wakeup.prepare_count > 0)
+		goto out;
+
+	/*
+	 * Executing the code below even if prepare_count is already zero when
+	 * the function is called may be useful, for example for initialisation.
+	 */
+	if (dev->wakeup.prepare_count < 0)
+		dev->wakeup.prepare_count = 0;
+
+	err = acpi_device_sleep_wake(dev, 0, 0, 0);
+	if (err)
+		goto out;
+
+	/* Close power resource */
+	for (i = 0; i < dev->wakeup.resources.count; i++) {
+		int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
+		if (ret) {
+			printk(KERN_ERR PREFIX "Transition power state\n");
+			dev->wakeup.flags.valid = 0;
+			err = -ENODEV;
+			goto out;
+		}
+	}
+
+ out:
+	mutex_unlock(&acpi_device_lock);
+	return err;
+}
+
+/* --------------------------------------------------------------------------
+                             Device Power Management
+   -------------------------------------------------------------------------- */
+
+int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
+{
+	int result = 0;
+	struct acpi_handle_list *list = NULL;
+	int list_state = 0;
+	int i = 0;
+
+	if (!device || !state)
+		return -EINVAL;
+
+	/*
+	 * We know a device's inferred power state when all the resources
+	 * required for a given D-state are 'on'.
+	 */
+	for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
+		list = &device->power.states[i].resources;
+		if (list->count < 1)
+			continue;
+
+		result = acpi_power_get_list_state(list, &list_state);
+		if (result)
+			return result;
+
+		if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
+			*state = i;
+			return 0;
+		}
+	}
+
+	*state = ACPI_STATE_D3;
+	return 0;
+}
+
+int acpi_power_on_resources(struct acpi_device *device, int state)
+{
+	if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
+		return -EINVAL;
+
+	return acpi_power_on_list(&device->power.states[state].resources);
+}
+
+int acpi_power_transition(struct acpi_device *device, int state)
+{
+	int result = 0;
+
+	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
+		return -EINVAL;
+
+	if (device->power.state == state)
+		return 0;
+
+	if ((device->power.state < ACPI_STATE_D0)
+	    || (device->power.state > ACPI_STATE_D3_COLD))
+		return -ENODEV;
+
+	/* TBD: Resources must be ordered. */
+
+	/*
+	 * First we reference all power resources required in the target list
+	 * (e.g. so the device doesn't lose power while transitioning).  Then,
+	 * we dereference all power resources used in the current list.
+	 */
+	if (state < ACPI_STATE_D3_COLD)
+		result = acpi_power_on_list(
+			&device->power.states[state].resources);
+
+	if (!result && device->power.state < ACPI_STATE_D3_COLD)
+		acpi_power_off_list(
+			&device->power.states[device->power.state].resources);
+
+	/* We shouldn't change the state unless the above operations succeed. */
+	device->power.state = result ? ACPI_STATE_UNKNOWN : state;
+
+	return result;
+}
+
+/* --------------------------------------------------------------------------
+                                Driver Interface
+   -------------------------------------------------------------------------- */
+
+static int acpi_power_add(struct acpi_device *device)
+{
+	int result = 0, state;
+	acpi_status status = AE_OK;
+	struct acpi_power_resource *resource = NULL;
+	union acpi_object acpi_object;
+	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
+
+
+	if (!device)
+		return -EINVAL;
+
+	resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
+	if (!resource)
+		return -ENOMEM;
+
+	resource->device = device;
+	mutex_init(&resource->resource_lock);
+	strcpy(resource->name, device->pnp.bus_id);
+	strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
+	device->driver_data = resource;
+
+	/* Evalute the object to get the system level and resource order. */
+	status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		result = -ENODEV;
+		goto end;
+	}
+	resource->system_level = acpi_object.power_resource.system_level;
+	resource->order = acpi_object.power_resource.resource_order;
+
+	result = acpi_power_get_state(device->handle, &state);
+	if (result)
+		goto end;
+
+	switch (state) {
+	case ACPI_POWER_RESOURCE_STATE_ON:
+		device->power.state = ACPI_STATE_D0;
+		break;
+	case ACPI_POWER_RESOURCE_STATE_OFF:
+		device->power.state = ACPI_STATE_D3;
+		break;
+	default:
+		device->power.state = ACPI_STATE_UNKNOWN;
+		break;
+	}
+
+	printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
+	       acpi_device_bid(device), state ? "on" : "off");
+
+      end:
+	if (result)
+		kfree(resource);
+
+	return result;
+}
+
+static int acpi_power_remove(struct acpi_device *device, int type)
+{
+	struct acpi_power_resource *resource;
+
+	if (!device)
+		return -EINVAL;
+
+	resource = acpi_driver_data(device);
+	if (!resource)
+		return -EINVAL;
+
+	kfree(resource);
+
+	return 0;
+}
+
+static int acpi_power_resume(struct acpi_device *device)
+{
+	int result = 0, state;
+	struct acpi_power_resource *resource;
+
+	if (!device)
+		return -EINVAL;
+
+	resource = acpi_driver_data(device);
+	if (!resource)
+		return -EINVAL;
+
+	mutex_lock(&resource->resource_lock);
+
+	result = acpi_power_get_state(device->handle, &state);
+	if (result)
+		goto unlock;
+
+	if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
+		result = __acpi_power_on(resource);
+
+ unlock:
+	mutex_unlock(&resource->resource_lock);
+
+	return result;
+}
+
+int __init acpi_power_init(void)
+{
+	INIT_LIST_HEAD(&acpi_power_resource_list);
+	return acpi_bus_register_driver(&acpi_power_driver);
+}