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26408b2434
attribute_groups are not supposed to change at runtime. All functions working with attribute_groups provided by <linux/sysfs.h> work with const attribute_group. So mark the non-const structs as const. File size before: text data bss dec hex filename 4622 304 8 4934 1346 drivers/acpi/power.o File size After adding 'const': text data bss dec hex filename 4846 80 8 4934 1346 drivers/acpi/power.o Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
900 lines
22 KiB
C
900 lines
22 KiB
C
/*
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* drivers/acpi/power.c - ACPI Power Resources management.
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*
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* Copyright (C) 2001 - 2015 Intel Corp.
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* Author: Andy Grover <andrew.grover@intel.com>
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* Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Author: Rafael J. Wysocki <rafael.j.wysocki@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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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/*
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* ACPI power-managed devices may be controlled in two ways:
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* 1. via "Device Specific (D-State) Control"
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* 2. via "Power Resource Control".
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* The code below deals with ACPI Power Resources control.
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*
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* An ACPI "power resource object" represents a software controllable power
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* plane, clock plane, or other resource depended on by a device.
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*
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* A device may rely on multiple power resources, and a power resource
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* may be shared by multiple devices.
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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/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/sysfs.h>
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#include <linux/acpi.h>
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#include "sleep.h"
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#include "internal.h"
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#define _COMPONENT ACPI_POWER_COMPONENT
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ACPI_MODULE_NAME("power");
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#define ACPI_POWER_CLASS "power_resource"
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#define ACPI_POWER_DEVICE_NAME "Power Resource"
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#define ACPI_POWER_FILE_INFO "info"
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#define ACPI_POWER_FILE_STATUS "state"
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#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
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#define ACPI_POWER_RESOURCE_STATE_ON 0x01
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#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
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struct acpi_power_resource {
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struct acpi_device device;
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struct list_head list_node;
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char *name;
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u32 system_level;
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u32 order;
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unsigned int ref_count;
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bool wakeup_enabled;
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struct mutex resource_lock;
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};
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struct acpi_power_resource_entry {
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struct list_head node;
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struct acpi_power_resource *resource;
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};
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static LIST_HEAD(acpi_power_resource_list);
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static DEFINE_MUTEX(power_resource_list_lock);
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/* --------------------------------------------------------------------------
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Power Resource Management
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-------------------------------------------------------------------------- */
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static inline
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struct acpi_power_resource *to_power_resource(struct acpi_device *device)
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{
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return container_of(device, struct acpi_power_resource, device);
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}
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static struct acpi_power_resource *acpi_power_get_context(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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return NULL;
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return to_power_resource(device);
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}
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static int acpi_power_resources_list_add(acpi_handle handle,
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struct list_head *list)
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{
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struct acpi_power_resource *resource = acpi_power_get_context(handle);
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struct acpi_power_resource_entry *entry;
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if (!resource || !list)
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return -EINVAL;
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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entry->resource = resource;
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if (!list_empty(list)) {
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struct acpi_power_resource_entry *e;
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list_for_each_entry(e, list, node)
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if (e->resource->order > resource->order) {
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list_add_tail(&entry->node, &e->node);
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return 0;
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}
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}
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list_add_tail(&entry->node, list);
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return 0;
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}
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void acpi_power_resources_list_free(struct list_head *list)
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{
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struct acpi_power_resource_entry *entry, *e;
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list_for_each_entry_safe(entry, e, list, node) {
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list_del(&entry->node);
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kfree(entry);
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}
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}
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int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
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struct list_head *list)
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{
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unsigned int i;
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int err = 0;
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for (i = start; i < package->package.count; i++) {
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union acpi_object *element = &package->package.elements[i];
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acpi_handle rhandle;
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if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
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err = -ENODATA;
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break;
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}
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rhandle = element->reference.handle;
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if (!rhandle) {
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err = -ENODEV;
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break;
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}
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err = acpi_add_power_resource(rhandle);
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if (err)
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break;
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err = acpi_power_resources_list_add(rhandle, list);
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if (err)
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break;
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}
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if (err)
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acpi_power_resources_list_free(list);
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return err;
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}
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static int acpi_power_get_state(acpi_handle handle, int *state)
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{
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acpi_status status = AE_OK;
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unsigned long long sta = 0;
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char node_name[5];
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struct acpi_buffer buffer = { sizeof(node_name), node_name };
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if (!handle || !state)
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return -EINVAL;
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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*state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
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ACPI_POWER_RESOURCE_STATE_OFF;
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acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
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node_name,
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*state ? "on" : "off"));
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return 0;
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}
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static int acpi_power_get_list_state(struct list_head *list, int *state)
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{
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struct acpi_power_resource_entry *entry;
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int cur_state;
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if (!list || !state)
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return -EINVAL;
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/* The state of the list is 'on' IFF all resources are 'on'. */
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cur_state = 0;
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list_for_each_entry(entry, list, node) {
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struct acpi_power_resource *resource = entry->resource;
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acpi_handle handle = resource->device.handle;
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int result;
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mutex_lock(&resource->resource_lock);
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result = acpi_power_get_state(handle, &cur_state);
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mutex_unlock(&resource->resource_lock);
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if (result)
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return result;
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if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
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break;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
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cur_state ? "on" : "off"));
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*state = cur_state;
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return 0;
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}
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static int __acpi_power_on(struct acpi_power_resource *resource)
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{
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acpi_status status = AE_OK;
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status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
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resource->name));
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return 0;
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}
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static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
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{
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int result = 0;
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if (resource->ref_count++) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Power resource [%s] already on\n",
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resource->name));
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} else {
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result = __acpi_power_on(resource);
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if (result)
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resource->ref_count--;
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}
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return result;
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}
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static int acpi_power_on(struct acpi_power_resource *resource)
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{
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int result;
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mutex_lock(&resource->resource_lock);
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result = acpi_power_on_unlocked(resource);
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mutex_unlock(&resource->resource_lock);
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return result;
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}
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static int __acpi_power_off(struct acpi_power_resource *resource)
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{
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acpi_status status;
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status = acpi_evaluate_object(resource->device.handle, "_OFF",
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NULL, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
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resource->name));
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return 0;
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}
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static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
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{
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int result = 0;
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if (!resource->ref_count) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Power resource [%s] already off\n",
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resource->name));
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return 0;
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}
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if (--resource->ref_count) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Power resource [%s] still in use\n",
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resource->name));
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} else {
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result = __acpi_power_off(resource);
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if (result)
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resource->ref_count++;
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}
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return result;
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}
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static int acpi_power_off(struct acpi_power_resource *resource)
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{
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int result;
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mutex_lock(&resource->resource_lock);
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result = acpi_power_off_unlocked(resource);
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mutex_unlock(&resource->resource_lock);
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return result;
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}
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static int acpi_power_off_list(struct list_head *list)
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{
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struct acpi_power_resource_entry *entry;
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int result = 0;
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list_for_each_entry_reverse(entry, list, node) {
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result = acpi_power_off(entry->resource);
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if (result)
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goto err;
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}
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return 0;
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err:
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list_for_each_entry_continue(entry, list, node)
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acpi_power_on(entry->resource);
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return result;
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}
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static int acpi_power_on_list(struct list_head *list)
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{
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struct acpi_power_resource_entry *entry;
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int result = 0;
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list_for_each_entry(entry, list, node) {
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result = acpi_power_on(entry->resource);
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if (result)
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goto err;
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}
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return 0;
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err:
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list_for_each_entry_continue_reverse(entry, list, node)
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acpi_power_off(entry->resource);
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return result;
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}
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static struct attribute *attrs[] = {
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NULL,
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};
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static const struct attribute_group attr_groups[] = {
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[ACPI_STATE_D0] = {
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.name = "power_resources_D0",
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.attrs = attrs,
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},
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[ACPI_STATE_D1] = {
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.name = "power_resources_D1",
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.attrs = attrs,
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},
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[ACPI_STATE_D2] = {
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.name = "power_resources_D2",
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.attrs = attrs,
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},
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[ACPI_STATE_D3_HOT] = {
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.name = "power_resources_D3hot",
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.attrs = attrs,
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},
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};
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static const struct attribute_group wakeup_attr_group = {
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.name = "power_resources_wakeup",
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.attrs = attrs,
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};
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static void acpi_power_hide_list(struct acpi_device *adev,
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struct list_head *resources,
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const struct attribute_group *attr_group)
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{
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struct acpi_power_resource_entry *entry;
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if (list_empty(resources))
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return;
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list_for_each_entry_reverse(entry, resources, node) {
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struct acpi_device *res_dev = &entry->resource->device;
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sysfs_remove_link_from_group(&adev->dev.kobj,
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attr_group->name,
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dev_name(&res_dev->dev));
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}
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sysfs_remove_group(&adev->dev.kobj, attr_group);
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}
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static void acpi_power_expose_list(struct acpi_device *adev,
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struct list_head *resources,
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const struct attribute_group *attr_group)
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{
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struct acpi_power_resource_entry *entry;
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int ret;
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if (list_empty(resources))
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return;
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ret = sysfs_create_group(&adev->dev.kobj, attr_group);
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if (ret)
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return;
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list_for_each_entry(entry, resources, node) {
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struct acpi_device *res_dev = &entry->resource->device;
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ret = sysfs_add_link_to_group(&adev->dev.kobj,
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attr_group->name,
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&res_dev->dev.kobj,
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dev_name(&res_dev->dev));
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if (ret) {
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acpi_power_hide_list(adev, resources, attr_group);
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break;
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}
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}
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}
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static void acpi_power_expose_hide(struct acpi_device *adev,
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struct list_head *resources,
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const struct attribute_group *attr_group,
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bool expose)
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{
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if (expose)
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acpi_power_expose_list(adev, resources, attr_group);
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else
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acpi_power_hide_list(adev, resources, attr_group);
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}
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void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
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{
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int state;
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if (adev->wakeup.flags.valid)
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acpi_power_expose_hide(adev, &adev->wakeup.resources,
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&wakeup_attr_group, add);
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if (!adev->power.flags.power_resources)
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return;
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for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
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acpi_power_expose_hide(adev,
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&adev->power.states[state].resources,
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&attr_groups[state], add);
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}
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int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
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{
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struct acpi_power_resource_entry *entry;
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int system_level = 5;
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list_for_each_entry(entry, list, node) {
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struct acpi_power_resource *resource = entry->resource;
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acpi_handle handle = resource->device.handle;
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int result;
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int state;
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mutex_lock(&resource->resource_lock);
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result = acpi_power_get_state(handle, &state);
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if (result) {
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mutex_unlock(&resource->resource_lock);
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return result;
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}
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if (state == ACPI_POWER_RESOURCE_STATE_ON) {
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resource->ref_count++;
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resource->wakeup_enabled = true;
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}
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if (system_level > resource->system_level)
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system_level = resource->system_level;
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mutex_unlock(&resource->resource_lock);
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}
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*system_level_p = system_level;
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return 0;
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}
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/* --------------------------------------------------------------------------
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Device Power Management
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-------------------------------------------------------------------------- */
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/**
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* acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
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* ACPI 3.0) _PSW (Power State Wake)
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* @dev: Device to handle.
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* @enable: 0 - disable, 1 - enable the wake capabilities of the device.
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* @sleep_state: Target sleep state of the system.
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* @dev_state: Target power state of the device.
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*
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* Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
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* State Wake) for the device, if present. On failure reset the device's
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* wakeup.flags.valid flag.
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*
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* RETURN VALUE:
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* 0 if either _DSW or _PSW has been successfully executed
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* 0 if neither _DSW nor _PSW has been found
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* -ENODEV if the execution of either _DSW or _PSW has failed
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*/
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int acpi_device_sleep_wake(struct acpi_device *dev,
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int enable, int sleep_state, int dev_state)
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{
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union acpi_object in_arg[3];
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struct acpi_object_list arg_list = { 3, in_arg };
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acpi_status status = AE_OK;
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/*
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* Try to execute _DSW first.
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*
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* Three agruments are needed for the _DSW object:
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* Argument 0: enable/disable the wake capabilities
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* Argument 1: target system state
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* Argument 2: target device state
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* When _DSW object is called to disable the wake capabilities, maybe
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* the first argument is filled. The values of the other two agruments
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* are meaningless.
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*/
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in_arg[0].type = ACPI_TYPE_INTEGER;
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in_arg[0].integer.value = enable;
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in_arg[1].type = ACPI_TYPE_INTEGER;
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in_arg[1].integer.value = sleep_state;
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in_arg[2].type = ACPI_TYPE_INTEGER;
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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 */
|
|
status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
|
|
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)
|
|
{
|
|
struct acpi_power_resource_entry *entry;
|
|
int err = 0;
|
|
|
|
if (!dev || !dev->wakeup.flags.valid)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
|
|
if (dev->wakeup.prepare_count++)
|
|
goto out;
|
|
|
|
list_for_each_entry(entry, &dev->wakeup.resources, node) {
|
|
struct acpi_power_resource *resource = entry->resource;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
if (!resource->wakeup_enabled) {
|
|
err = acpi_power_on_unlocked(resource);
|
|
if (!err)
|
|
resource->wakeup_enabled = true;
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
|
|
if (err) {
|
|
dev_err(&dev->dev,
|
|
"Cannot turn wakeup power resources on\n");
|
|
dev->wakeup.flags.valid = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* Passing 3 as the third argument below means the device may be
|
|
* put into arbitrary power state afterward.
|
|
*/
|
|
err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
|
|
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)
|
|
{
|
|
struct acpi_power_resource_entry *entry;
|
|
int 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;
|
|
|
|
list_for_each_entry(entry, &dev->wakeup.resources, node) {
|
|
struct acpi_power_resource *resource = entry->resource;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
if (resource->wakeup_enabled) {
|
|
err = acpi_power_off_unlocked(resource);
|
|
if (!err)
|
|
resource->wakeup_enabled = false;
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
|
|
if (err) {
|
|
dev_err(&dev->dev,
|
|
"Cannot turn wakeup power resources off\n");
|
|
dev->wakeup.flags.valid = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&acpi_device_lock);
|
|
return err;
|
|
}
|
|
|
|
int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
|
|
{
|
|
int result = 0;
|
|
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++) {
|
|
struct list_head *list = &device->power.states[i].resources;
|
|
|
|
if (list_empty(list))
|
|
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 = device->power.states[ACPI_STATE_D3_COLD].flags.valid ?
|
|
ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT;
|
|
return 0;
|
|
}
|
|
|
|
int acpi_power_on_resources(struct acpi_device *device, int state)
|
|
{
|
|
if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
|
|
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 || !device->flags.power_manageable)
|
|
return 0;
|
|
|
|
if ((device->power.state < ACPI_STATE_D0)
|
|
|| (device->power.state > ACPI_STATE_D3_COLD))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
static void acpi_release_power_resource(struct device *dev)
|
|
{
|
|
struct acpi_device *device = to_acpi_device(dev);
|
|
struct acpi_power_resource *resource;
|
|
|
|
resource = container_of(device, struct acpi_power_resource, device);
|
|
|
|
mutex_lock(&power_resource_list_lock);
|
|
list_del(&resource->list_node);
|
|
mutex_unlock(&power_resource_list_lock);
|
|
|
|
acpi_free_pnp_ids(&device->pnp);
|
|
kfree(resource);
|
|
}
|
|
|
|
static ssize_t acpi_power_in_use_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf) {
|
|
struct acpi_power_resource *resource;
|
|
|
|
resource = to_power_resource(to_acpi_device(dev));
|
|
return sprintf(buf, "%u\n", !!resource->ref_count);
|
|
}
|
|
static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
|
|
|
|
static void acpi_power_sysfs_remove(struct acpi_device *device)
|
|
{
|
|
device_remove_file(&device->dev, &dev_attr_resource_in_use);
|
|
}
|
|
|
|
static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource)
|
|
{
|
|
mutex_lock(&power_resource_list_lock);
|
|
|
|
if (!list_empty(&acpi_power_resource_list)) {
|
|
struct acpi_power_resource *r;
|
|
|
|
list_for_each_entry(r, &acpi_power_resource_list, list_node)
|
|
if (r->order > resource->order) {
|
|
list_add_tail(&resource->list_node, &r->list_node);
|
|
goto out;
|
|
}
|
|
}
|
|
list_add_tail(&resource->list_node, &acpi_power_resource_list);
|
|
|
|
out:
|
|
mutex_unlock(&power_resource_list_lock);
|
|
}
|
|
|
|
int acpi_add_power_resource(acpi_handle handle)
|
|
{
|
|
struct acpi_power_resource *resource;
|
|
struct acpi_device *device = NULL;
|
|
union acpi_object acpi_object;
|
|
struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
|
|
acpi_status status;
|
|
int state, result = -ENODEV;
|
|
|
|
acpi_bus_get_device(handle, &device);
|
|
if (device)
|
|
return 0;
|
|
|
|
resource = kzalloc(sizeof(*resource), GFP_KERNEL);
|
|
if (!resource)
|
|
return -ENOMEM;
|
|
|
|
device = &resource->device;
|
|
acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
|
|
ACPI_STA_DEFAULT);
|
|
mutex_init(&resource->resource_lock);
|
|
INIT_LIST_HEAD(&resource->list_node);
|
|
resource->name = device->pnp.bus_id;
|
|
strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
|
|
device->power.state = ACPI_STATE_UNKNOWN;
|
|
|
|
/* Evalute the object to get the system level and resource order. */
|
|
status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
goto err;
|
|
|
|
resource->system_level = acpi_object.power_resource.system_level;
|
|
resource->order = acpi_object.power_resource.resource_order;
|
|
|
|
result = acpi_power_get_state(handle, &state);
|
|
if (result)
|
|
goto err;
|
|
|
|
printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
|
|
acpi_device_bid(device), state ? "on" : "off");
|
|
|
|
device->flags.match_driver = true;
|
|
result = acpi_device_add(device, acpi_release_power_resource);
|
|
if (result)
|
|
goto err;
|
|
|
|
if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
|
|
device->remove = acpi_power_sysfs_remove;
|
|
|
|
acpi_power_add_resource_to_list(resource);
|
|
acpi_device_add_finalize(device);
|
|
return 0;
|
|
|
|
err:
|
|
acpi_release_power_resource(&device->dev);
|
|
return result;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_SLEEP
|
|
void acpi_resume_power_resources(void)
|
|
{
|
|
struct acpi_power_resource *resource;
|
|
|
|
mutex_lock(&power_resource_list_lock);
|
|
|
|
list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
|
|
int result, state;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
result = acpi_power_get_state(resource->device.handle, &state);
|
|
if (result) {
|
|
mutex_unlock(&resource->resource_lock);
|
|
continue;
|
|
}
|
|
|
|
if (state == ACPI_POWER_RESOURCE_STATE_OFF
|
|
&& resource->ref_count) {
|
|
dev_info(&resource->device.dev, "Turning ON\n");
|
|
__acpi_power_on(resource);
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
}
|
|
|
|
mutex_unlock(&power_resource_list_lock);
|
|
}
|
|
|
|
void acpi_turn_off_unused_power_resources(void)
|
|
{
|
|
struct acpi_power_resource *resource;
|
|
|
|
mutex_lock(&power_resource_list_lock);
|
|
|
|
list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
|
|
int result, state;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
result = acpi_power_get_state(resource->device.handle, &state);
|
|
if (result) {
|
|
mutex_unlock(&resource->resource_lock);
|
|
continue;
|
|
}
|
|
|
|
if (state == ACPI_POWER_RESOURCE_STATE_ON
|
|
&& !resource->ref_count) {
|
|
dev_info(&resource->device.dev, "Turning OFF\n");
|
|
__acpi_power_off(resource);
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
}
|
|
|
|
mutex_unlock(&power_resource_list_lock);
|
|
}
|
|
#endif
|