[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/acpi/power.c b/ap/os/linux/linux-3.4.x/drivers/acpi/power.c
new file mode 100644
index 0000000..2adef53
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/acpi/power.c
@@ -0,0 +1,817 @@
+/*
+ * 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;
+ struct mutex devices_lock;
+};
+
+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)
+{
+ 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));
+
+ return 0;
+}
+
+static int acpi_power_on(acpi_handle handle)
+{
+ int result = 0;
+ bool resume_device = false;
+ struct acpi_power_resource *resource = NULL;
+ struct acpi_power_resource_device *device_list;
+
+ 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--;
+ else
+ resume_device = true;
+ }
+
+ mutex_unlock(&resource->resource_lock);
+
+ if (!resume_device)
+ return result;
+
+ mutex_lock(&resource->devices_lock);
+
+ device_list = resource->devices;
+ while (device_list) {
+ acpi_power_on_device(device_list->device);
+ device_list = device_list->next;
+ }
+
+ mutex_unlock(&resource->devices_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->devices_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->devices_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->devices_lock);
+ power_resource_device->next = resource->devices;
+ resource->devices = power_resource_device;
+ mutex_unlock(&resource->devices_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_DEBUG 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);
+ mutex_init(&resource->devices_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);
+}