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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Merge ACPI device enumeration updates, ACPI power management updates and PCI host bridge ACPI driver updates for 5.17-rc1: - Introduce acpi_fetch_acpi_dev() as a replacement for acpi_bus_get_device() and use it in the ACPI subsystem (Rafael Wysocki). - Avoid using _CID for device enumaration if _HID is missing or invalid (Rafael Wysocki). - Rework quirk handling during ACPI device enumeration and add some new quirks for known broken platforms (Hans de Goede). - Avoid unnecessary or redundant CPU cache flushing during system PM transitions (Kirill A. Shutemov). - Add PM debug messages related to power resources (Rafael Wysocki). - Fix kernel-doc comment in the PCI host bridge ACPI driver (Yang Li). * acpi-scan: serdev: Do not instantiate serdevs on boards with known bogus DSDT entries i2c: acpi: Do not instantiate I2C-clients on boards with known bogus DSDT entries ACPI / x86: Add acpi_quirk_skip_[i2c_client|serdev]_enumeration() helpers ACPI: scan: Create platform device for BCM4752 and LNV4752 ACPI nodes ACPI: Use acpi_fetch_acpi_dev() instead of acpi_bus_get_device() ACPI: scan: Introduce acpi_fetch_acpi_dev() ACPI: scan: Do not add device IDs from _CID if _HID is not valid * acpi-pm: ACPI: PM: Remove redundant cache flushing ACPI: PM: Avoid CPU cache flush when entering S4 * acpi-power: ACPI: PM: Emit debug messages when enabling/disabling wakeup power * acpi-pci: PCI/ACPI: Fix acpi_pci_osc_control_set() kernel-doc comment
1042 lines
26 KiB
C
1042 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* 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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#define pr_fmt(fmt) "ACPI: PM: " fmt
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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 ACPI_POWER_CLASS "power_resource"
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#define ACPI_POWER_DEVICE_NAME "Power Resource"
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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_dependent_device {
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struct device *dev;
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struct list_head node;
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};
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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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u32 system_level;
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u32 order;
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unsigned int ref_count;
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u8 state;
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struct mutex resource_lock;
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struct list_head dependents;
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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 const char *resource_dev_name(struct acpi_power_resource *pr)
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{
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return dev_name(&pr->device.dev);
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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 = acpi_fetch_acpi_dev(handle);
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if (!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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static bool acpi_power_resource_is_dup(union acpi_object *package,
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unsigned int start, unsigned int i)
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{
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acpi_handle rhandle, dup;
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unsigned int j;
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/* The caller is expected to check the package element types */
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rhandle = package->package.elements[i].reference.handle;
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for (j = start; j < i; j++) {
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dup = package->package.elements[j].reference.handle;
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if (dup == rhandle)
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return true;
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}
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return false;
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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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struct acpi_device *rdev;
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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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/* Some ACPI tables contain duplicate power resource references */
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if (acpi_power_resource_is_dup(package, start, i))
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continue;
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rdev = acpi_add_power_resource(rhandle);
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if (!rdev) {
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err = -ENODEV;
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break;
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}
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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 __get_state(acpi_handle handle, u8 *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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u8 cur_state;
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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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cur_state = sta & ACPI_POWER_RESOURCE_STATE_ON;
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acpi_handle_debug(handle, "Power resource 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_get_state(struct acpi_power_resource *resource, u8 *state)
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{
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if (resource->state == ACPI_POWER_RESOURCE_STATE_UNKNOWN) {
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int ret;
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ret = __get_state(resource->device.handle, &resource->state);
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if (ret)
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return ret;
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}
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*state = resource->state;
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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, u8 *state)
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{
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struct acpi_power_resource_entry *entry;
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u8 cur_state = ACPI_POWER_RESOURCE_STATE_OFF;
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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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list_for_each_entry(entry, list, node) {
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struct acpi_power_resource *resource = entry->resource;
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int result;
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mutex_lock(&resource->resource_lock);
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result = acpi_power_get_state(resource, &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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pr_debug("Power resource list is %s\n", 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
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acpi_power_resource_add_dependent(struct acpi_power_resource *resource,
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struct device *dev)
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{
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struct acpi_power_dependent_device *dep;
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int ret = 0;
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mutex_lock(&resource->resource_lock);
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list_for_each_entry(dep, &resource->dependents, node) {
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/* Only add it once */
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if (dep->dev == dev)
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goto unlock;
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}
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dep = kzalloc(sizeof(*dep), GFP_KERNEL);
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if (!dep) {
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ret = -ENOMEM;
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goto unlock;
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}
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dep->dev = dev;
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list_add_tail(&dep->node, &resource->dependents);
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dev_dbg(dev, "added power dependency to [%s]\n",
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resource_dev_name(resource));
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unlock:
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mutex_unlock(&resource->resource_lock);
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return ret;
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}
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static void
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acpi_power_resource_remove_dependent(struct acpi_power_resource *resource,
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struct device *dev)
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{
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struct acpi_power_dependent_device *dep;
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mutex_lock(&resource->resource_lock);
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list_for_each_entry(dep, &resource->dependents, node) {
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if (dep->dev == dev) {
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list_del(&dep->node);
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kfree(dep);
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dev_dbg(dev, "removed power dependency to [%s]\n",
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resource_dev_name(resource));
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break;
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}
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}
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mutex_unlock(&resource->resource_lock);
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}
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/**
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* acpi_device_power_add_dependent - Add dependent device of this ACPI device
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* @adev: ACPI device pointer
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* @dev: Dependent device
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*
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* If @adev has non-empty _PR0 the @dev is added as dependent device to all
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* power resources returned by it. This means that whenever these power
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* resources are turned _ON the dependent devices get runtime resumed. This
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* is needed for devices such as PCI to allow its driver to re-initialize
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* it after it went to D0uninitialized.
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*
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* If @adev does not have _PR0 this does nothing.
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*
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* Returns %0 in case of success and negative errno otherwise.
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*/
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int acpi_device_power_add_dependent(struct acpi_device *adev,
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struct device *dev)
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{
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struct acpi_power_resource_entry *entry;
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struct list_head *resources;
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int ret;
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if (!adev->flags.power_manageable)
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return 0;
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resources = &adev->power.states[ACPI_STATE_D0].resources;
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list_for_each_entry(entry, resources, node) {
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ret = acpi_power_resource_add_dependent(entry->resource, dev);
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if (ret)
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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(entry, resources, node)
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acpi_power_resource_remove_dependent(entry->resource, dev);
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return ret;
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}
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/**
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* acpi_device_power_remove_dependent - Remove dependent device
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* @adev: ACPI device pointer
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* @dev: Dependent device
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*
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* Does the opposite of acpi_device_power_add_dependent() and removes the
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* dependent device if it is found. Can be called to @adev that does not
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* have _PR0 as well.
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*/
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void acpi_device_power_remove_dependent(struct acpi_device *adev,
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struct device *dev)
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{
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struct acpi_power_resource_entry *entry;
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struct list_head *resources;
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if (!adev->flags.power_manageable)
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return;
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resources = &adev->power.states[ACPI_STATE_D0].resources;
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list_for_each_entry_reverse(entry, resources, node)
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acpi_power_resource_remove_dependent(entry->resource, dev);
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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_handle handle = resource->device.handle;
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struct acpi_power_dependent_device *dep;
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acpi_status status = AE_OK;
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status = acpi_evaluate_object(handle, "_ON", NULL, NULL);
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if (ACPI_FAILURE(status)) {
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resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
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return -ENODEV;
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}
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resource->state = ACPI_POWER_RESOURCE_STATE_ON;
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acpi_handle_debug(handle, "Power resource turned on\n");
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/*
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* If there are other dependents on this power resource we need to
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* resume them now so that their drivers can re-initialize the
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* hardware properly after it went back to D0.
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*/
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if (list_empty(&resource->dependents) ||
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list_is_singular(&resource->dependents))
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return 0;
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list_for_each_entry(dep, &resource->dependents, node) {
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dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n",
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resource_dev_name(resource));
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pm_request_resume(dep->dev);
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}
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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_handle_debug(resource->device.handle,
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"Power resource already on\n");
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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_handle handle = resource->device.handle;
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acpi_status status;
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status = acpi_evaluate_object(handle, "_OFF", NULL, NULL);
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if (ACPI_FAILURE(status)) {
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resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
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return -ENODEV;
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}
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resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
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acpi_handle_debug(handle, "Power resource turned off\n");
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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_handle_debug(resource->device.handle,
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"Power resource already off\n");
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return 0;
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}
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|
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if (--resource->ref_count) {
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acpi_handle_debug(resource->device.handle,
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"Power resource still in use\n");
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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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|
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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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|
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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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|
|
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list_for_each_entry_reverse(entry, list, node) {
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result = acpi_power_off(entry->resource);
|
|
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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|
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return result;
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}
|
|
|
|
static int acpi_power_on_list(struct list_head *list)
|
|
{
|
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struct acpi_power_resource_entry *entry;
|
|
int result = 0;
|
|
|
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list_for_each_entry(entry, list, node) {
|
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result = acpi_power_on(entry->resource);
|
|
if (result)
|
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goto err;
|
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}
|
|
return 0;
|
|
|
|
err:
|
|
list_for_each_entry_continue_reverse(entry, list, node)
|
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acpi_power_off(entry->resource);
|
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|
|
return result;
|
|
}
|
|
|
|
static struct attribute *attrs[] = {
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group attr_groups[] = {
|
|
[ACPI_STATE_D0] = {
|
|
.name = "power_resources_D0",
|
|
.attrs = attrs,
|
|
},
|
|
[ACPI_STATE_D1] = {
|
|
.name = "power_resources_D1",
|
|
.attrs = attrs,
|
|
},
|
|
[ACPI_STATE_D2] = {
|
|
.name = "power_resources_D2",
|
|
.attrs = attrs,
|
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},
|
|
[ACPI_STATE_D3_HOT] = {
|
|
.name = "power_resources_D3hot",
|
|
.attrs = attrs,
|
|
},
|
|
};
|
|
|
|
static const struct attribute_group wakeup_attr_group = {
|
|
.name = "power_resources_wakeup",
|
|
.attrs = attrs,
|
|
};
|
|
|
|
static void acpi_power_hide_list(struct acpi_device *adev,
|
|
struct list_head *resources,
|
|
const struct attribute_group *attr_group)
|
|
{
|
|
struct acpi_power_resource_entry *entry;
|
|
|
|
if (list_empty(resources))
|
|
return;
|
|
|
|
list_for_each_entry_reverse(entry, resources, node) {
|
|
struct acpi_device *res_dev = &entry->resource->device;
|
|
|
|
sysfs_remove_link_from_group(&adev->dev.kobj,
|
|
attr_group->name,
|
|
dev_name(&res_dev->dev));
|
|
}
|
|
sysfs_remove_group(&adev->dev.kobj, attr_group);
|
|
}
|
|
|
|
static void acpi_power_expose_list(struct acpi_device *adev,
|
|
struct list_head *resources,
|
|
const struct attribute_group *attr_group)
|
|
{
|
|
struct acpi_power_resource_entry *entry;
|
|
int ret;
|
|
|
|
if (list_empty(resources))
|
|
return;
|
|
|
|
ret = sysfs_create_group(&adev->dev.kobj, attr_group);
|
|
if (ret)
|
|
return;
|
|
|
|
list_for_each_entry(entry, resources, node) {
|
|
struct acpi_device *res_dev = &entry->resource->device;
|
|
|
|
ret = sysfs_add_link_to_group(&adev->dev.kobj,
|
|
attr_group->name,
|
|
&res_dev->dev.kobj,
|
|
dev_name(&res_dev->dev));
|
|
if (ret) {
|
|
acpi_power_hide_list(adev, resources, attr_group);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void acpi_power_expose_hide(struct acpi_device *adev,
|
|
struct list_head *resources,
|
|
const struct attribute_group *attr_group,
|
|
bool expose)
|
|
{
|
|
if (expose)
|
|
acpi_power_expose_list(adev, resources, attr_group);
|
|
else
|
|
acpi_power_hide_list(adev, resources, attr_group);
|
|
}
|
|
|
|
void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
|
|
{
|
|
int state;
|
|
|
|
if (adev->wakeup.flags.valid)
|
|
acpi_power_expose_hide(adev, &adev->wakeup.resources,
|
|
&wakeup_attr_group, add);
|
|
|
|
if (!adev->power.flags.power_resources)
|
|
return;
|
|
|
|
for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
|
|
acpi_power_expose_hide(adev,
|
|
&adev->power.states[state].resources,
|
|
&attr_groups[state], add);
|
|
}
|
|
|
|
int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
|
|
{
|
|
struct acpi_power_resource_entry *entry;
|
|
int system_level = 5;
|
|
|
|
list_for_each_entry(entry, list, node) {
|
|
struct acpi_power_resource *resource = entry->resource;
|
|
u8 state;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
/*
|
|
* Make sure that the power resource state and its reference
|
|
* counter value are consistent with each other.
|
|
*/
|
|
if (!resource->ref_count &&
|
|
!acpi_power_get_state(resource, &state) &&
|
|
state == ACPI_POWER_RESOURCE_STATE_ON)
|
|
__acpi_power_off(resource);
|
|
|
|
if (system_level > resource->system_level)
|
|
system_level = resource->system_level;
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
}
|
|
*system_level_p = system_level;
|
|
return 0;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Device Power Management
|
|
-------------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
|
|
* ACPI 3.0) _PSW (Power State Wake)
|
|
* @dev: Device to handle.
|
|
* @enable: 0 - disable, 1 - enable the wake capabilities of the device.
|
|
* @sleep_state: Target sleep state of the system.
|
|
* @dev_state: Target power state of the device.
|
|
*
|
|
* Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
|
|
* State Wake) for the device, if present. On failure reset the device's
|
|
* wakeup.flags.valid flag.
|
|
*
|
|
* RETURN VALUE:
|
|
* 0 if either _DSW or _PSW has been successfully executed
|
|
* 0 if neither _DSW nor _PSW has been found
|
|
* -ENODEV if the execution of either _DSW or _PSW has failed
|
|
*/
|
|
int acpi_device_sleep_wake(struct acpi_device *dev,
|
|
int enable, int sleep_state, int dev_state)
|
|
{
|
|
union acpi_object in_arg[3];
|
|
struct acpi_object_list arg_list = { 3, in_arg };
|
|
acpi_status status = AE_OK;
|
|
|
|
/*
|
|
* Try to execute _DSW first.
|
|
*
|
|
* Three arguments are needed for the _DSW object:
|
|
* Argument 0: enable/disable the wake capabilities
|
|
* Argument 1: target system state
|
|
* Argument 2: target device state
|
|
* When _DSW object is called to disable the wake capabilities, maybe
|
|
* the first argument is filled. The values of the other two arguments
|
|
* are meaningless.
|
|
*/
|
|
in_arg[0].type = ACPI_TYPE_INTEGER;
|
|
in_arg[0].integer.value = enable;
|
|
in_arg[1].type = ACPI_TYPE_INTEGER;
|
|
in_arg[1].integer.value = sleep_state;
|
|
in_arg[2].type = ACPI_TYPE_INTEGER;
|
|
in_arg[2].integer.value = dev_state;
|
|
status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return 0;
|
|
} else if (status != AE_NOT_FOUND) {
|
|
acpi_handle_info(dev->handle, "_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)) {
|
|
acpi_handle_info(dev->handle, "_PSW execution failed\n");
|
|
dev->wakeup.flags.valid = 0;
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
|
|
* 1. Power on the power resources required for the wakeup device
|
|
* 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
|
|
* State Wake) for the device, if present
|
|
*/
|
|
int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!dev || !dev->wakeup.flags.valid)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
|
|
dev_dbg(&dev->dev, "Enabling wakeup power (count %d)\n",
|
|
dev->wakeup.prepare_count);
|
|
|
|
if (dev->wakeup.prepare_count++)
|
|
goto out;
|
|
|
|
err = acpi_power_on_list(&dev->wakeup.resources);
|
|
if (err) {
|
|
dev_err(&dev->dev, "Cannot turn on wakeup power resources\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) {
|
|
acpi_power_off_list(&dev->wakeup.resources);
|
|
dev->wakeup.prepare_count = 0;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "Wakeup power enabled\n");
|
|
|
|
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);
|
|
|
|
dev_dbg(&dev->dev, "Disabling wakeup power (count %d)\n",
|
|
dev->wakeup.prepare_count);
|
|
|
|
/* Do nothing if wakeup power has not been enabled for this device. */
|
|
if (dev->wakeup.prepare_count <= 0)
|
|
goto out;
|
|
|
|
if (--dev->wakeup.prepare_count > 0)
|
|
goto out;
|
|
|
|
err = acpi_device_sleep_wake(dev, 0, 0, 0);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* All of the power resources in the list need to be turned off even if
|
|
* there are errors.
|
|
*/
|
|
list_for_each_entry(entry, &dev->wakeup.resources, node) {
|
|
int ret;
|
|
|
|
ret = acpi_power_off(entry->resource);
|
|
if (ret && !err)
|
|
err = ret;
|
|
}
|
|
if (err) {
|
|
dev_err(&dev->dev, "Cannot turn off wakeup power resources\n");
|
|
dev->wakeup.flags.valid = 0;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "Wakeup power disabled\n");
|
|
|
|
out:
|
|
mutex_unlock(&acpi_device_lock);
|
|
return err;
|
|
}
|
|
|
|
int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
|
|
{
|
|
u8 list_state = ACPI_POWER_RESOURCE_STATE_OFF;
|
|
int result = 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 resource_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_RO(resource_in_use);
|
|
|
|
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);
|
|
}
|
|
|
|
struct acpi_device *acpi_add_power_resource(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device = acpi_fetch_acpi_dev(handle);
|
|
struct acpi_power_resource *resource;
|
|
union acpi_object acpi_object;
|
|
struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
|
|
acpi_status status;
|
|
u8 state_dummy;
|
|
int result;
|
|
|
|
if (device)
|
|
return device;
|
|
|
|
resource = kzalloc(sizeof(*resource), GFP_KERNEL);
|
|
if (!resource)
|
|
return NULL;
|
|
|
|
device = &resource->device;
|
|
acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER);
|
|
mutex_init(&resource->resource_lock);
|
|
INIT_LIST_HEAD(&resource->list_node);
|
|
INIT_LIST_HEAD(&resource->dependents);
|
|
strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
|
|
device->power.state = ACPI_STATE_UNKNOWN;
|
|
|
|
/* Evaluate 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;
|
|
resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
|
|
|
|
/* Get the initial state or just flip it on if that fails. */
|
|
if (acpi_power_get_state(resource, &state_dummy))
|
|
__acpi_power_on(resource);
|
|
|
|
pr_info("%s [%s]\n", acpi_device_name(device), acpi_device_bid(device));
|
|
|
|
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 device;
|
|
|
|
err:
|
|
acpi_release_power_resource(&device->dev);
|
|
return NULL;
|
|
}
|
|
|
|
#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;
|
|
u8 state;
|
|
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
|
|
result = acpi_power_get_state(resource, &state);
|
|
if (result) {
|
|
mutex_unlock(&resource->resource_lock);
|
|
continue;
|
|
}
|
|
|
|
if (state == ACPI_POWER_RESOURCE_STATE_OFF
|
|
&& resource->ref_count) {
|
|
acpi_handle_debug(resource->device.handle, "Turning ON\n");
|
|
__acpi_power_on(resource);
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
}
|
|
|
|
mutex_unlock(&power_resource_list_lock);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* acpi_turn_off_unused_power_resources - Turn off power resources not in use.
|
|
*/
|
|
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) {
|
|
mutex_lock(&resource->resource_lock);
|
|
|
|
if (!resource->ref_count &&
|
|
resource->state == ACPI_POWER_RESOURCE_STATE_ON) {
|
|
acpi_handle_debug(resource->device.handle, "Turning OFF\n");
|
|
__acpi_power_off(resource);
|
|
}
|
|
|
|
mutex_unlock(&resource->resource_lock);
|
|
}
|
|
|
|
mutex_unlock(&power_resource_list_lock);
|
|
}
|