linux-imx

/*

 * drivers/acpi/power.c - ACPI Power Resources management.

 *

 * Copyright (C) 2001 - 2015 Intel Corp.

 * Author: Andy Grover <andrew.grover@intel.com>

 * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>

 * Author: Rafael J. Wysocki <rafael.j.wysocki@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.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

​

/*

 * ACPI power-managed devices may be controlled in two ways:

 * 1. via "Device Specific (D-State) Control"

 * 2. via "Power Resource Control".

 * The code below deals with ACPI Power Resources control.

 * 

 * An ACPI "power resource object" represents a software controllable power

 * plane, clock plane, or other resource depended on by a 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 <linux/sysfs.h>

#include <linux/acpi.h>

#include "sleep.h"

#include "internal.h"

​

#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

​

struct acpi_power_resource {

    struct acpi_device device;

    struct list_head list_node;

    char *name;

    u32 system_level;

    u32 order;