![Burman Yan](/assets/img/avatar_default.png)
Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
625 lines
15 KiB
C
625 lines
15 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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#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/proc_fs.h>
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#include <linux/seq_file.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.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_COMPONENT 0x00800000
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#define ACPI_POWER_CLASS "power_resource"
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#define ACPI_POWER_DRIVER_NAME "ACPI Power Resource Driver"
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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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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_open_fs(struct inode *inode, struct file *file);
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static struct acpi_driver acpi_power_driver = {
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.name = ACPI_POWER_DRIVER_NAME,
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.class = ACPI_POWER_CLASS,
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.ids = ACPI_POWER_HID,
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.ops = {
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.add = acpi_power_add,
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.remove = acpi_power_remove,
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},
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};
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struct acpi_power_resource {
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struct acpi_device * device;
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acpi_bus_id name;
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u32 system_level;
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u32 order;
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int state;
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int references;
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};
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static struct list_head acpi_power_resource_list;
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static const struct file_operations acpi_power_fops = {
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.open = acpi_power_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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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(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 -ENODEV;
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result = acpi_bus_get_device(handle, &device);
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if (result) {
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printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
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return result;
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}
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*resource = acpi_driver_data(device);
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if (!resource)
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return -ENODEV;
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return 0;
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}
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static int acpi_power_get_state(struct acpi_power_resource *resource)
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{
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acpi_status status = AE_OK;
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unsigned long sta = 0;
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if (!resource)
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return -EINVAL;
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status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (sta & 0x01)
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resource->state = ACPI_POWER_RESOURCE_STATE_ON;
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else
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resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
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resource->name, resource->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 acpi_handle_list *list, 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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u32 i = 0;
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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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for (i = 0; i < list->count; i++) {
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result = acpi_power_get_context(list->handles[i], &resource);
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if (result)
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return result;
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result = acpi_power_get_state(resource);
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if (result)
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return result;
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*state = resource->state;
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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 acpi_power_on(acpi_handle handle)
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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_device *device = NULL;
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struct acpi_power_resource *resource = NULL;
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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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resource->references++;
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if ((resource->references > 1)
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|| (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n",
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resource->name));
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return 0;
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}
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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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result = acpi_power_get_state(resource);
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if (result)
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return result;
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if (resource->state != ACPI_POWER_RESOURCE_STATE_ON)
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return -ENOEXEC;
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/* Update the power resource's _device_ power state */
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device = resource->device;
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resource->device->power.state = ACPI_STATE_D0;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_off_device(acpi_handle handle)
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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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result = acpi_power_get_context(handle, &resource);
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if (result)
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return result;
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if (resource->references)
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resource->references--;
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if (resource->references) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Resource [%s] is still in use, dereferencing\n",
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resource->device->pnp.bus_id));
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return 0;
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}
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if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n",
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resource->device->pnp.bus_id));
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return 0;
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}
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status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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result = acpi_power_get_state(resource);
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if (result)
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return result;
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if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF)
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return -ENOEXEC;
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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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* 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. Enable _PSW (power 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)
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{
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union acpi_object arg = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &arg };
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acpi_status status = AE_OK;
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int i;
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int ret = 0;
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if (!dev || !dev->wakeup.flags.valid)
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return -1;
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arg.integer.value = 1;
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/* Open power resource */
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for (i = 0; i < dev->wakeup.resources.count; i++) {
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ret = acpi_power_on(dev->wakeup.resources.handles[i]);
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if (ret) {
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printk(KERN_ERR PREFIX "Transition power state\n");
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dev->wakeup.flags.valid = 0;
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return -1;
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}
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}
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/* Execute PSW */
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status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
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if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
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printk(KERN_ERR PREFIX "Evaluate _PSW\n");
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dev->wakeup.flags.valid = 0;
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ret = -1;
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}
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return ret;
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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. Disable _PSW (power state wake)
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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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union acpi_object arg = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &arg };
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acpi_status status = AE_OK;
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int i;
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int ret = 0;
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if (!dev || !dev->wakeup.flags.valid)
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return -1;
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arg.integer.value = 0;
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/* Execute PSW */
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status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
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if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
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printk(KERN_ERR PREFIX "Evaluate _PSW\n");
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dev->wakeup.flags.valid = 0;
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return -1;
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}
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/* Close power resource */
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for (i = 0; i < dev->wakeup.resources.count; i++) {
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ret = acpi_power_off_device(dev->wakeup.resources.handles[i]);
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if (ret) {
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printk(KERN_ERR PREFIX "Transition power state\n");
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dev->wakeup.flags.valid = 0;
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return -1;
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}
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}
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return ret;
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}
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/* --------------------------------------------------------------------------
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Device Power Management
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-------------------------------------------------------------------------- */
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int acpi_power_get_inferred_state(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 -EINVAL;
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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 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 0;
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}
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}
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device->power.state = ACPI_STATE_D3;
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return 0;
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}
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int acpi_power_transition(struct acpi_device *device, 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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int i = 0;
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if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
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return -EINVAL;
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if ((device->power.state < ACPI_STATE_D0)
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|| (device->power.state > ACPI_STATE_D3))
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return -ENODEV;
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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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device->power.state = ACPI_STATE_UNKNOWN;
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if (!cl->count && !tl->count) {
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result = -ENODEV;
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goto end;
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}
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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]);
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if (result)
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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]);
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if (result)
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goto end;
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}
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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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end:
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if (result)
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printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n",
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device->pnp.bus_id, state);
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return result;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static struct proc_dir_entry *acpi_power_dir;
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static int acpi_power_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_power_resource *resource = NULL;
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resource = seq->private;
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if (!resource)
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goto end;
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seq_puts(seq, "state: ");
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switch (resource->state) {
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case ACPI_POWER_RESOURCE_STATE_ON:
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seq_puts(seq, "on\n");
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break;
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case ACPI_POWER_RESOURCE_STATE_OFF:
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seq_puts(seq, "off\n");
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break;
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default:
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seq_puts(seq, "unknown\n");
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break;
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}
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seq_printf(seq, "system level: S%d\n"
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"order: %d\n"
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"reference count: %d\n",
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resource->system_level,
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resource->order, resource->references);
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end:
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return 0;
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}
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static int acpi_power_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_power_seq_show, PDE(inode)->data);
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}
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static int acpi_power_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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if (!device)
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return -EINVAL;
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if (!acpi_device_dir(device)) {
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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acpi_power_dir);
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if (!acpi_device_dir(device))
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return -ENODEV;
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}
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/* 'status' [R] */
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entry = create_proc_entry(ACPI_POWER_FILE_STATUS,
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S_IRUGO, acpi_device_dir(device));
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_power_fops;
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entry->data = acpi_driver_data(device);
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}
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return 0;
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}
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static int acpi_power_remove_fs(struct acpi_device *device)
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{
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if (acpi_device_dir(device)) {
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remove_proc_entry(ACPI_POWER_FILE_STATUS,
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acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
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acpi_device_dir(device) = NULL;
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}
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return 0;
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}
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/* --------------------------------------------------------------------------
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Driver Interface
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-------------------------------------------------------------------------- */
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static int acpi_power_add(struct acpi_device *device)
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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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union acpi_object acpi_object;
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struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
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if (!device)
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return -EINVAL;
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resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
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if (!resource)
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return -ENOMEM;
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resource->device = device;
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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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acpi_driver_data(device) = resource;
|
|
|
|
/* Evalute the object to get the system level and resource order. */
|
|
status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
result = -ENODEV;
|
|
goto end;
|
|
}
|
|
resource->system_level = acpi_object.power_resource.system_level;
|
|
resource->order = acpi_object.power_resource.resource_order;
|
|
|
|
result = acpi_power_get_state(resource);
|
|
if (result)
|
|
goto end;
|
|
|
|
switch (resource->state) {
|
|
case ACPI_POWER_RESOURCE_STATE_ON:
|
|
device->power.state = ACPI_STATE_D0;
|
|
break;
|
|
case ACPI_POWER_RESOURCE_STATE_OFF:
|
|
device->power.state = ACPI_STATE_D3;
|
|
break;
|
|
default:
|
|
device->power.state = ACPI_STATE_UNKNOWN;
|
|
break;
|
|
}
|
|
|
|
result = acpi_power_add_fs(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
|
|
acpi_device_bid(device), resource->state ? "on" : "off");
|
|
|
|
end:
|
|
if (result)
|
|
kfree(resource);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int acpi_power_remove(struct acpi_device *device, int type)
|
|
{
|
|
struct acpi_power_resource *resource = NULL;
|
|
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return -EINVAL;
|
|
|
|
resource = acpi_driver_data(device);
|
|
|
|
acpi_power_remove_fs(device);
|
|
|
|
kfree(resource);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init acpi_power_init(void)
|
|
{
|
|
int result = 0;
|
|
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
INIT_LIST_HEAD(&acpi_power_resource_list);
|
|
|
|
acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
|
|
if (!acpi_power_dir)
|
|
return -ENODEV;
|
|
|
|
result = acpi_bus_register_driver(&acpi_power_driver);
|
|
if (result < 0) {
|
|
remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(acpi_power_init);
|