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676 lines
17 KiB
C
676 lines
17 KiB
C
/*
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* acpi_power.c - ACPI Bus Power Management ($Revision: 39 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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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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* This module is used to manage devices relying on Power Resource Control.
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*
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* An ACPI "power resource object" describes a software controllable power
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* plane, clock plane, or other resource used by a power managed device.
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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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/*
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* Modified for ReactOS and latest ACPICA
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* Copyright (C)2009 Samuel Serapion
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*/
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#include <precomp.h>
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#define NDEBUG
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#include <debug.h>
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#define _COMPONENT ACPI_POWER_COMPONENT
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ACPI_MODULE_NAME ("acpi_power")
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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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int acpi_power_nocheck;
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static int acpi_power_add (struct acpi_device *device);
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static int acpi_power_remove (struct acpi_device *device, int type);
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static int acpi_power_resume(struct acpi_device *device, int state);
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static struct acpi_driver acpi_power_driver = {
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{0,0},
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ACPI_POWER_DRIVER_NAME,
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ACPI_POWER_CLASS,
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0,
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0,
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ACPI_POWER_HID,
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{acpi_power_add, acpi_power_remove, NULL, NULL, acpi_power_resume}
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};
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struct acpi_power_reference {
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struct list_head node;
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struct acpi_device *device;
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};
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struct acpi_power_resource
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{
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struct acpi_device * device;
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acpi_bus_id name;
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UINT32 system_level;
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UINT32 order;
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//struct mutex resource_lock;
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struct list_head reference;
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};
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static struct list_head acpi_power_resource_list;
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/* --------------------------------------------------------------------------
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Power Resource Management
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-------------------------------------------------------------------------- */
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static int
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acpi_power_get_context (
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ACPI_HANDLE handle,
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struct acpi_power_resource **resource)
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{
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int result = 0;
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struct acpi_device *device = NULL;
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if (!resource)
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return_VALUE(-15);
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result = acpi_bus_get_device(handle, &device);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context [%p]\n",
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handle));
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return_VALUE(result);
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}
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*resource = (struct acpi_power_resource *) acpi_driver_data(device);
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if (!*resource)
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return_VALUE(-15);
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return 0;
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}
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static int
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acpi_power_get_state (
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ACPI_HANDLE handle,
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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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ACPI_BUFFER buffer = { sizeof(node_name), node_name };
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if (!handle || !state)
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return_VALUE(-1);
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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_VALUE(-15);
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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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AcpiGetName(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, *state?"on":"off"));
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return 0;
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}
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static int
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acpi_power_get_list_state (
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struct acpi_handle_list *list,
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int *state)
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{
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int result = 0, state1;
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UINT32 i = 0;
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if (!list || !state)
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return_VALUE(-1);
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/* The state of the list is 'on' IFF all resources are 'on'. */
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for (i=0; i<list->count; i++) {
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/*
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* The state of the power resource can be obtained by
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* using the ACPI handle. In such case it is unnecessary to
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* get the Power resource first and then get its state again.
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*/
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result = acpi_power_get_state(list->handles[i], &state1);
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if (result)
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return result;
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*state = state1;
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if (*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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*state?"on":"off"));
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return result;
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}
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static int
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acpi_power_on (
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ACPI_HANDLE handle, struct acpi_device *dev)
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{
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int result = 0;
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int found = 0;
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ACPI_STATUS status = AE_OK;
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struct acpi_power_resource *resource = NULL;
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struct list_head *node, *next;
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struct acpi_power_reference *ref;
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result = acpi_power_get_context(handle, &resource);
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if (result)
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return result;
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//mutex_lock(&resource->resource_lock);
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list_for_each_safe(node, next, &resource->reference) {
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ref = container_of(node, struct acpi_power_reference, node);
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if (dev->handle == ref->device->handle) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n",
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dev->pnp.bus_id, resource->name));
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found = 1;
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break;
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}
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}
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if (!found) {
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ref = ExAllocatePoolWithTag(NonPagedPool,sizeof (struct acpi_power_reference),'IPCA');
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if (!ref) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n"));
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//mutex_unlock(&resource->resource_lock);
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return -1;//-ENOMEM;
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}
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list_add_tail(&ref->node, &resource->reference);
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ref->device = dev;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n",
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dev->pnp.bus_id, resource->name));
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}
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//mutex_unlock(&resource->resource_lock);
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status = AcpiEvaluateObject(resource->device->handle, "_ON", NULL, NULL);
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if (ACPI_FAILURE(status))
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return_VALUE(-15);
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/* Update the power resource's _device_ power state */
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resource->device->power.state = ACPI_STATE_D0;
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return 0;
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}
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static int
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acpi_power_off_device (
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ACPI_HANDLE handle,
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struct acpi_device *dev)
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{
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int result = 0;
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ACPI_STATUS status = AE_OK;
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struct acpi_power_resource *resource = NULL;
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struct list_head *node, *next;
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struct acpi_power_reference *ref;
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result = acpi_power_get_context(handle, &resource);
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if (result)
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return result;
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//mutex_lock(&resource->resource_lock);
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list_for_each_safe(node, next, &resource->reference) {
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ref = container_of(node, struct acpi_power_reference, node);
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if (dev->handle == ref->device->handle) {
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list_del(&ref->node);
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ExFreePool(ref);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
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dev->pnp.bus_id, resource->name));
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break;
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}
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}
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if (!list_empty(&resource->reference)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
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resource->name));
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//mutex_unlock(&resource->resource_lock);
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return 0;
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}
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//mutex_unlock(&resource->resource_lock);
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status = AcpiEvaluateObject(resource->device->handle, "_OFF", NULL, NULL);
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if (ACPI_FAILURE(status))
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return -1;
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/* Update the power resource's _device_ power state */
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resource->device->power.state = ACPI_STATE_D3;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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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/**
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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 arguments 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 arguments
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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;
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status = AcpiEvaluateObject(dev->handle, "_DSW", &arg_list, NULL);
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if (ACPI_SUCCESS(status)) {
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return 0;
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} else if (status != AE_NOT_FOUND) {
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DPRINT1("_DSW execution failed\n");
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dev->wakeup.flags.valid = 0;
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return -1;
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}
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/* Execute _PSW */
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arg_list.Count = 1;
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in_arg[0].Integer.Value = enable;
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status = AcpiEvaluateObject(dev->handle, "_PSW", &arg_list, NULL);
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if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
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DPRINT1("_PSW execution failed\n");
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dev->wakeup.flags.valid = 0;
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return -1;
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}
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return 0;
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}
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/*
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* Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
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* 1. Power on the power resources required for the wakeup device
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* 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
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* State Wake) for the device, if present
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*/
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int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
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{
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unsigned int i;
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int err = 0;
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if (!dev || !dev->wakeup.flags.valid)
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return -1;
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//mutex_lock(&acpi_device_lock);
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if (dev->wakeup.prepare_count++)
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goto out;
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/* Open power resource */
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for (i = 0; i < dev->wakeup.resources.count; i++) {
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int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
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if (ret) {
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DPRINT( "Transition power state\n");
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dev->wakeup.flags.valid = 0;
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err = -1;
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goto err_out;
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}
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}
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/*
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* Passing 3 as the third argument below means the device may be placed
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* in arbitrary power state afterwards.
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*/
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err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
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err_out:
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if (err)
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dev->wakeup.prepare_count = 0;
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out:
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//mutex_unlock(&acpi_device_lock);
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return err;
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}
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/*
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* Shutdown a wakeup device, counterpart of above method
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* 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
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* State Wake) for the device, if present
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* 2. Shutdown down the power resources
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*/
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int acpi_disable_wakeup_device_power(struct acpi_device *dev)
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{
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unsigned int i;
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int err = 0;
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if (!dev || !dev->wakeup.flags.valid)
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return -1;
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//mutex_lock(&acpi_device_lock);
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if (--dev->wakeup.prepare_count > 0)
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goto out;
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/*
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* Executing the code below even if prepare_count is already zero when
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* the function is called may be useful, for example for initialisation.
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*/
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if (dev->wakeup.prepare_count < 0)
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dev->wakeup.prepare_count = 0;
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err = acpi_device_sleep_wake(dev, 0, 0, 0);
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if (err)
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goto out;
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/* Close power resource */
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for (i = 0; i < dev->wakeup.resources.count; i++) {
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int ret = acpi_power_off_device(
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dev->wakeup.resources.handles[i], dev);
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if (ret) {
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DPRINT("Transition power state\n");
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dev->wakeup.flags.valid = 0;
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err = -1;
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goto out;
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}
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}
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out:
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//mutex_unlock(&acpi_device_lock);
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return err;
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}
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/* --------------------------------------------------------------------------
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Device Power Management
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-------------------------------------------------------------------------- */
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int
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acpi_power_get_inferred_state (
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struct acpi_device *device)
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{
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int result = 0;
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struct acpi_handle_list *list = NULL;
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int list_state = 0;
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int i = 0;
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if (!device)
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return_VALUE(-1);
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device->power.state = ACPI_STATE_UNKNOWN;
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/*
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* We know a device's inferred power state when all the resources
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* required for a given D-state are 'on'.
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*/
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for (i=ACPI_STATE_D0; i<ACPI_STATE_D3; i++) {
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list = &device->power.states[i].resources;
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if (list->count < 1)
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continue;
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result = acpi_power_get_list_state(list, &list_state);
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if (result)
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return_VALUE(result);
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if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
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device->power.state = i;
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return_VALUE(0);
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}
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}
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device->power.state = ACPI_STATE_D3;
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return_VALUE(0);
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}
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int
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acpi_power_transition (
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struct acpi_device *device,
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int state)
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{
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int result = 0;
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struct acpi_handle_list *cl = NULL; /* Current Resources */
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struct acpi_handle_list *tl = NULL; /* Target Resources */
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unsigned int i = 0;
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if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
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return_VALUE(-1);
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if ((device->power.state < ACPI_STATE_D0) || (device->power.state > ACPI_STATE_D3))
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return_VALUE(-15);
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cl = &device->power.states[device->power.state].resources;
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tl = &device->power.states[state].resources;
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/* TBD: Resources must be ordered. */
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/*
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* First we reference all power resources required in the target list
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* (e.g. so the device doesn't lose power while transitioning).
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*/
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for (i = 0; i < tl->count; i++) {
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result = acpi_power_on(tl->handles[i], device);
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if (result)
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goto end;
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}
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if (device->power.state == state) {
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goto end;
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}
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/*
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* Then we dereference all power resources used in the current list.
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*/
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for (i = 0; i < cl->count; i++) {
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result = acpi_power_off_device(cl->handles[i], device);
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if (result)
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goto end;
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}
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end:
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if (result)
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device->power.state = ACPI_STATE_UNKNOWN;
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else {
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/* We shouldn't change the state till all above operations succeed */
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device->power.state = state;
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}
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return result;
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}
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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int
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acpi_power_add (
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struct acpi_device *device)
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{
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int result = 0, state;
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ACPI_STATUS status = AE_OK;
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struct acpi_power_resource *resource = NULL;
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union acpi_object acpi_object;
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ACPI_BUFFER buffer = {sizeof(ACPI_OBJECT), &acpi_object};
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if (!device)
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return_VALUE(-1);
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resource = ExAllocatePoolWithTag(NonPagedPool,sizeof(struct acpi_power_resource),'IPCA');
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if (!resource)
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return_VALUE(-4);
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resource->device = device;
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//mutex_init(&resource->resource_lock);
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INIT_LIST_HEAD(&resource->reference);
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strcpy(resource->name, device->pnp.bus_id);
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strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
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device->driver_data = resource;
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/* Evalute the object to get the system level and resource order. */
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status = AcpiEvaluateObject(device->handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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result = -15;
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goto end;
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}
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resource->system_level = acpi_object.PowerResource.SystemLevel;
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resource->order = acpi_object.PowerResource.ResourceOrder;
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result = acpi_power_get_state(device->handle, &state);
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if (result)
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goto end;
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switch (state) {
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case ACPI_POWER_RESOURCE_STATE_ON:
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device->power.state = ACPI_STATE_D0;
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break;
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case ACPI_POWER_RESOURCE_STATE_OFF:
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device->power.state = ACPI_STATE_D3;
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break;
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default:
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device->power.state = ACPI_STATE_UNKNOWN;
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break;
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}
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DPRINT("%s [%s] (%s)\n", acpi_device_name(device),
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acpi_device_bid(device), state?"on":"off");
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end:
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if (result)
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ExFreePool(resource);
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return result;
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}
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int
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acpi_power_remove (
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struct acpi_device *device,
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int type)
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{
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struct acpi_power_resource *resource = NULL;
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struct list_head *node, *next;
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if (!device || !acpi_driver_data(device))
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return_VALUE(-1);
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resource = acpi_driver_data(device);
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//mutex_lock(&resource->resource_lock);
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list_for_each_safe(node, next, &resource->reference) {
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struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
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list_del(&ref->node);
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ExFreePool(ref);
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}
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//mutex_unlock(&resource->resource_lock);
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ExFreePool(resource);
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return_VALUE(0);
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}
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static int acpi_power_resume(struct acpi_device *device, int state)
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{
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int result = 0;
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struct acpi_power_resource *resource = NULL;
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struct acpi_power_reference *ref;
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if (!device || !acpi_driver_data(device))
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return -1;
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resource = acpi_driver_data(device);
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result = acpi_power_get_state(device->handle, &state);
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if (result)
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return result;
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//mutex_lock(&resource->resource_lock);
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if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
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!list_empty(&resource->reference)) {
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ref = container_of(resource->reference.next, struct acpi_power_reference, node);
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//mutex_unlock(&resource->resource_lock);
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result = acpi_power_on(device->handle, ref->device);
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return result;
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}
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//mutex_unlock(&resource->resource_lock);
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return 0;
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}
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int
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acpi_power_init (void)
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{
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int result = 0;
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DPRINT("acpi_power_init\n");
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INIT_LIST_HEAD(&acpi_power_resource_list);
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result = acpi_bus_register_driver(&acpi_power_driver);
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if (result < 0) {
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return_VALUE(-15);
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}
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return_VALUE(0);
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}
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