mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
78a898d0e3
Drivers that needs acpi_device_fix_up_power(), allow them to be built as modules by exporting this function. Cc: <stable@vger.kernel.org> # 4.5+ Tested-by: Laszlo Fiat <laszlo.fiat@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1127 lines
32 KiB
C
1127 lines
32 KiB
C
/*
|
|
* drivers/acpi/device_pm.c - ACPI device power management routines.
|
|
*
|
|
* Copyright (C) 2012, Intel Corp.
|
|
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/export.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/pm_qos.h>
|
|
#include <linux/pm_domain.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#include "internal.h"
|
|
|
|
#define _COMPONENT ACPI_POWER_COMPONENT
|
|
ACPI_MODULE_NAME("device_pm");
|
|
|
|
/**
|
|
* acpi_power_state_string - String representation of ACPI device power state.
|
|
* @state: ACPI device power state to return the string representation of.
|
|
*/
|
|
const char *acpi_power_state_string(int state)
|
|
{
|
|
switch (state) {
|
|
case ACPI_STATE_D0:
|
|
return "D0";
|
|
case ACPI_STATE_D1:
|
|
return "D1";
|
|
case ACPI_STATE_D2:
|
|
return "D2";
|
|
case ACPI_STATE_D3_HOT:
|
|
return "D3hot";
|
|
case ACPI_STATE_D3_COLD:
|
|
return "D3cold";
|
|
default:
|
|
return "(unknown)";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_device_get_power - Get power state of an ACPI device.
|
|
* @device: Device to get the power state of.
|
|
* @state: Place to store the power state of the device.
|
|
*
|
|
* This function does not update the device's power.state field, but it may
|
|
* update its parent's power.state field (when the parent's power state is
|
|
* unknown and the device's power state turns out to be D0).
|
|
*/
|
|
int acpi_device_get_power(struct acpi_device *device, int *state)
|
|
{
|
|
int result = ACPI_STATE_UNKNOWN;
|
|
|
|
if (!device || !state)
|
|
return -EINVAL;
|
|
|
|
if (!device->flags.power_manageable) {
|
|
/* TBD: Non-recursive algorithm for walking up hierarchy. */
|
|
*state = device->parent ?
|
|
device->parent->power.state : ACPI_STATE_D0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Get the device's power state from power resources settings and _PSC,
|
|
* if available.
|
|
*/
|
|
if (device->power.flags.power_resources) {
|
|
int error = acpi_power_get_inferred_state(device, &result);
|
|
if (error)
|
|
return error;
|
|
}
|
|
if (device->power.flags.explicit_get) {
|
|
acpi_handle handle = device->handle;
|
|
unsigned long long psc;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* The power resources settings may indicate a power state
|
|
* shallower than the actual power state of the device, because
|
|
* the same power resources may be referenced by other devices.
|
|
*
|
|
* For systems predating ACPI 4.0 we assume that D3hot is the
|
|
* deepest state that can be supported.
|
|
*/
|
|
if (psc > result && psc < ACPI_STATE_D3_COLD)
|
|
result = psc;
|
|
else if (result == ACPI_STATE_UNKNOWN)
|
|
result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc;
|
|
}
|
|
|
|
/*
|
|
* If we were unsure about the device parent's power state up to this
|
|
* point, the fact that the device is in D0 implies that the parent has
|
|
* to be in D0 too, except if ignore_parent is set.
|
|
*/
|
|
if (!device->power.flags.ignore_parent && device->parent
|
|
&& device->parent->power.state == ACPI_STATE_UNKNOWN
|
|
&& result == ACPI_STATE_D0)
|
|
device->parent->power.state = ACPI_STATE_D0;
|
|
|
|
*state = result;
|
|
|
|
out:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
|
|
device->pnp.bus_id, acpi_power_state_string(*state)));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
|
|
{
|
|
if (adev->power.states[state].flags.explicit_set) {
|
|
char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_device_set_power - Set power state of an ACPI device.
|
|
* @device: Device to set the power state of.
|
|
* @state: New power state to set.
|
|
*
|
|
* Callers must ensure that the device is power manageable before using this
|
|
* function.
|
|
*/
|
|
int acpi_device_set_power(struct acpi_device *device, int state)
|
|
{
|
|
int target_state = state;
|
|
int result = 0;
|
|
|
|
if (!device || !device->flags.power_manageable
|
|
|| (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
|
|
return -EINVAL;
|
|
|
|
/* Make sure this is a valid target state */
|
|
|
|
if (state == device->power.state) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n",
|
|
device->pnp.bus_id,
|
|
acpi_power_state_string(state)));
|
|
return 0;
|
|
}
|
|
|
|
if (state == ACPI_STATE_D3_COLD) {
|
|
/*
|
|
* For transitions to D3cold we need to execute _PS3 and then
|
|
* possibly drop references to the power resources in use.
|
|
*/
|
|
state = ACPI_STATE_D3_HOT;
|
|
/* If _PR3 is not available, use D3hot as the target state. */
|
|
if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)
|
|
target_state = state;
|
|
} else if (!device->power.states[state].flags.valid) {
|
|
dev_warn(&device->dev, "Power state %s not supported\n",
|
|
acpi_power_state_string(state));
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!device->power.flags.ignore_parent &&
|
|
device->parent && (state < device->parent->power.state)) {
|
|
dev_warn(&device->dev,
|
|
"Cannot transition to power state %s for parent in %s\n",
|
|
acpi_power_state_string(state),
|
|
acpi_power_state_string(device->parent->power.state));
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Transition Power
|
|
* ----------------
|
|
* In accordance with ACPI 6, _PSx is executed before manipulating power
|
|
* resources, unless the target state is D0, in which case _PS0 is
|
|
* supposed to be executed after turning the power resources on.
|
|
*/
|
|
if (state > ACPI_STATE_D0) {
|
|
/*
|
|
* According to ACPI 6, devices cannot go from lower-power
|
|
* (deeper) states to higher-power (shallower) states.
|
|
*/
|
|
if (state < device->power.state) {
|
|
dev_warn(&device->dev, "Cannot transition from %s to %s\n",
|
|
acpi_power_state_string(device->power.state),
|
|
acpi_power_state_string(state));
|
|
return -ENODEV;
|
|
}
|
|
|
|
result = acpi_dev_pm_explicit_set(device, state);
|
|
if (result)
|
|
goto end;
|
|
|
|
if (device->power.flags.power_resources)
|
|
result = acpi_power_transition(device, target_state);
|
|
} else {
|
|
if (device->power.flags.power_resources) {
|
|
result = acpi_power_transition(device, ACPI_STATE_D0);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
|
|
}
|
|
|
|
end:
|
|
if (result) {
|
|
dev_warn(&device->dev, "Failed to change power state to %s\n",
|
|
acpi_power_state_string(state));
|
|
} else {
|
|
device->power.state = target_state;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Device [%s] transitioned to %s\n",
|
|
device->pnp.bus_id,
|
|
acpi_power_state_string(state)));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(acpi_device_set_power);
|
|
|
|
int acpi_bus_set_power(acpi_handle handle, int state)
|
|
{
|
|
struct acpi_device *device;
|
|
int result;
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
if (result)
|
|
return result;
|
|
|
|
return acpi_device_set_power(device, state);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_set_power);
|
|
|
|
int acpi_bus_init_power(struct acpi_device *device)
|
|
{
|
|
int state;
|
|
int result;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
device->power.state = ACPI_STATE_UNKNOWN;
|
|
if (!acpi_device_is_present(device))
|
|
return -ENXIO;
|
|
|
|
result = acpi_device_get_power(device, &state);
|
|
if (result)
|
|
return result;
|
|
|
|
if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
|
|
/* Reference count the power resources. */
|
|
result = acpi_power_on_resources(device, state);
|
|
if (result)
|
|
return result;
|
|
|
|
if (state == ACPI_STATE_D0) {
|
|
/*
|
|
* If _PSC is not present and the state inferred from
|
|
* power resources appears to be D0, it still may be
|
|
* necessary to execute _PS0 at this point, because
|
|
* another device using the same power resources may
|
|
* have been put into D0 previously and that's why we
|
|
* see D0 here.
|
|
*/
|
|
result = acpi_dev_pm_explicit_set(device, state);
|
|
if (result)
|
|
return result;
|
|
}
|
|
} else if (state == ACPI_STATE_UNKNOWN) {
|
|
/*
|
|
* No power resources and missing _PSC? Cross fingers and make
|
|
* it D0 in hope that this is what the BIOS put the device into.
|
|
* [We tried to force D0 here by executing _PS0, but that broke
|
|
* Toshiba P870-303 in a nasty way.]
|
|
*/
|
|
state = ACPI_STATE_D0;
|
|
}
|
|
device->power.state = state;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_device_fix_up_power - Force device with missing _PSC into D0.
|
|
* @device: Device object whose power state is to be fixed up.
|
|
*
|
|
* Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
|
|
* are assumed to be put into D0 by the BIOS. However, in some cases that may
|
|
* not be the case and this function should be used then.
|
|
*/
|
|
int acpi_device_fix_up_power(struct acpi_device *device)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!device->power.flags.power_resources
|
|
&& !device->power.flags.explicit_get
|
|
&& device->power.state == ACPI_STATE_D0)
|
|
ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_device_fix_up_power);
|
|
|
|
int acpi_device_update_power(struct acpi_device *device, int *state_p)
|
|
{
|
|
int state;
|
|
int result;
|
|
|
|
if (device->power.state == ACPI_STATE_UNKNOWN) {
|
|
result = acpi_bus_init_power(device);
|
|
if (!result && state_p)
|
|
*state_p = device->power.state;
|
|
|
|
return result;
|
|
}
|
|
|
|
result = acpi_device_get_power(device, &state);
|
|
if (result)
|
|
return result;
|
|
|
|
if (state == ACPI_STATE_UNKNOWN) {
|
|
state = ACPI_STATE_D0;
|
|
result = acpi_device_set_power(device, state);
|
|
if (result)
|
|
return result;
|
|
} else {
|
|
if (device->power.flags.power_resources) {
|
|
/*
|
|
* We don't need to really switch the state, bu we need
|
|
* to update the power resources' reference counters.
|
|
*/
|
|
result = acpi_power_transition(device, state);
|
|
if (result)
|
|
return result;
|
|
}
|
|
device->power.state = state;
|
|
}
|
|
if (state_p)
|
|
*state_p = state;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_device_update_power);
|
|
|
|
int acpi_bus_update_power(acpi_handle handle, int *state_p)
|
|
{
|
|
struct acpi_device *device;
|
|
int result;
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
return result ? result : acpi_device_update_power(device, state_p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_bus_update_power);
|
|
|
|
bool acpi_bus_power_manageable(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
int result;
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
return result ? false : device->flags.power_manageable;
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_power_manageable);
|
|
|
|
#ifdef CONFIG_PM
|
|
static DEFINE_MUTEX(acpi_pm_notifier_lock);
|
|
|
|
static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
if (val != ACPI_NOTIFY_DEVICE_WAKE)
|
|
return;
|
|
|
|
adev = acpi_bus_get_acpi_device(handle);
|
|
if (!adev)
|
|
return;
|
|
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
|
|
|
if (adev->wakeup.flags.notifier_present) {
|
|
__pm_wakeup_event(adev->wakeup.ws, 0);
|
|
if (adev->wakeup.context.work.func)
|
|
queue_pm_work(&adev->wakeup.context.work);
|
|
}
|
|
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
|
|
|
acpi_bus_put_acpi_device(adev);
|
|
}
|
|
|
|
/**
|
|
* acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
|
|
* @adev: ACPI device to add the notify handler for.
|
|
* @dev: Device to generate a wakeup event for while handling the notification.
|
|
* @work_func: Work function to execute when handling the notification.
|
|
*
|
|
* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
|
|
* PM wakeup events. For example, wakeup events may be generated for bridges
|
|
* if one of the devices below the bridge is signaling wakeup, even if the
|
|
* bridge itself doesn't have a wakeup GPE associated with it.
|
|
*/
|
|
acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
|
|
void (*work_func)(struct work_struct *work))
|
|
{
|
|
acpi_status status = AE_ALREADY_EXISTS;
|
|
|
|
if (!dev && !work_func)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
|
|
|
if (adev->wakeup.flags.notifier_present)
|
|
goto out;
|
|
|
|
adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev));
|
|
adev->wakeup.context.dev = dev;
|
|
if (work_func)
|
|
INIT_WORK(&adev->wakeup.context.work, work_func);
|
|
|
|
status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
|
|
acpi_pm_notify_handler, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
|
|
adev->wakeup.flags.notifier_present = true;
|
|
|
|
out:
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
|
|
* @adev: ACPI device to remove the notifier from.
|
|
*/
|
|
acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
|
|
{
|
|
acpi_status status = AE_BAD_PARAMETER;
|
|
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
|
|
|
if (!adev->wakeup.flags.notifier_present)
|
|
goto out;
|
|
|
|
status = acpi_remove_notify_handler(adev->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
acpi_pm_notify_handler);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
|
|
if (adev->wakeup.context.work.func) {
|
|
cancel_work_sync(&adev->wakeup.context.work);
|
|
adev->wakeup.context.work.func = NULL;
|
|
}
|
|
adev->wakeup.context.dev = NULL;
|
|
wakeup_source_unregister(adev->wakeup.ws);
|
|
|
|
adev->wakeup.flags.notifier_present = false;
|
|
|
|
out:
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
|
return status;
|
|
}
|
|
|
|
bool acpi_bus_can_wakeup(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
int result;
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
return result ? false : device->wakeup.flags.valid;
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_can_wakeup);
|
|
|
|
/**
|
|
* acpi_dev_pm_get_state - Get preferred power state of ACPI device.
|
|
* @dev: Device whose preferred target power state to return.
|
|
* @adev: ACPI device node corresponding to @dev.
|
|
* @target_state: System state to match the resultant device state.
|
|
* @d_min_p: Location to store the highest power state available to the device.
|
|
* @d_max_p: Location to store the lowest power state available to the device.
|
|
*
|
|
* Find the lowest power (highest number) and highest power (lowest number) ACPI
|
|
* device power states that the device can be in while the system is in the
|
|
* state represented by @target_state. Store the integer numbers representing
|
|
* those stats in the memory locations pointed to by @d_max_p and @d_min_p,
|
|
* respectively.
|
|
*
|
|
* Callers must ensure that @dev and @adev are valid pointers and that @adev
|
|
* actually corresponds to @dev before using this function.
|
|
*
|
|
* Returns 0 on success or -ENODATA when one of the ACPI methods fails or
|
|
* returns a value that doesn't make sense. The memory locations pointed to by
|
|
* @d_max_p and @d_min_p are only modified on success.
|
|
*/
|
|
static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
|
|
u32 target_state, int *d_min_p, int *d_max_p)
|
|
{
|
|
char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
|
|
acpi_handle handle = adev->handle;
|
|
unsigned long long ret;
|
|
int d_min, d_max;
|
|
bool wakeup = false;
|
|
acpi_status status;
|
|
|
|
/*
|
|
* If the system state is S0, the lowest power state the device can be
|
|
* in is D3cold, unless the device has _S0W and is supposed to signal
|
|
* wakeup, in which case the return value of _S0W has to be used as the
|
|
* lowest power state available to the device.
|
|
*/
|
|
d_min = ACPI_STATE_D0;
|
|
d_max = ACPI_STATE_D3_COLD;
|
|
|
|
/*
|
|
* If present, _SxD methods return the minimum D-state (highest power
|
|
* state) we can use for the corresponding S-states. Otherwise, the
|
|
* minimum D-state is D0 (ACPI 3.x).
|
|
*/
|
|
if (target_state > ACPI_STATE_S0) {
|
|
/*
|
|
* We rely on acpi_evaluate_integer() not clobbering the integer
|
|
* provided if AE_NOT_FOUND is returned.
|
|
*/
|
|
ret = d_min;
|
|
status = acpi_evaluate_integer(handle, method, NULL, &ret);
|
|
if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
|
|
|| ret > ACPI_STATE_D3_COLD)
|
|
return -ENODATA;
|
|
|
|
/*
|
|
* We need to handle legacy systems where D3hot and D3cold are
|
|
* the same and 3 is returned in both cases, so fall back to
|
|
* D3cold if D3hot is not a valid state.
|
|
*/
|
|
if (!adev->power.states[ret].flags.valid) {
|
|
if (ret == ACPI_STATE_D3_HOT)
|
|
ret = ACPI_STATE_D3_COLD;
|
|
else
|
|
return -ENODATA;
|
|
}
|
|
d_min = ret;
|
|
wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
|
|
&& adev->wakeup.sleep_state >= target_state;
|
|
} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
|
|
PM_QOS_FLAGS_NONE) {
|
|
wakeup = adev->wakeup.flags.valid;
|
|
}
|
|
|
|
/*
|
|
* If _PRW says we can wake up the system from the target sleep state,
|
|
* the D-state returned by _SxD is sufficient for that (we assume a
|
|
* wakeup-aware driver if wake is set). Still, if _SxW exists
|
|
* (ACPI 3.x), it should return the maximum (lowest power) D-state that
|
|
* can wake the system. _S0W may be valid, too.
|
|
*/
|
|
if (wakeup) {
|
|
method[3] = 'W';
|
|
status = acpi_evaluate_integer(handle, method, NULL, &ret);
|
|
if (status == AE_NOT_FOUND) {
|
|
if (target_state > ACPI_STATE_S0)
|
|
d_max = d_min;
|
|
} else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
|
|
/* Fall back to D3cold if ret is not a valid state. */
|
|
if (!adev->power.states[ret].flags.valid)
|
|
ret = ACPI_STATE_D3_COLD;
|
|
|
|
d_max = ret > d_min ? ret : d_min;
|
|
} else {
|
|
return -ENODATA;
|
|
}
|
|
}
|
|
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
|
|
if (d_max_p)
|
|
*d_max_p = d_max;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
|
|
* @dev: Device whose preferred target power state to return.
|
|
* @d_min_p: Location to store the upper limit of the allowed states range.
|
|
* @d_max_in: Deepest low-power state to take into consideration.
|
|
* Return value: Preferred power state of the device on success, -ENODEV
|
|
* if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
|
|
* incorrect, or -ENODATA on ACPI method failure.
|
|
*
|
|
* The caller must ensure that @dev is valid before using this function.
|
|
*/
|
|
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
|
|
{
|
|
struct acpi_device *adev;
|
|
int ret, d_min, d_max;
|
|
|
|
if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
|
|
return -EINVAL;
|
|
|
|
if (d_max_in > ACPI_STATE_D2) {
|
|
enum pm_qos_flags_status stat;
|
|
|
|
stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
|
|
if (stat == PM_QOS_FLAGS_ALL)
|
|
d_max_in = ACPI_STATE_D2;
|
|
}
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (!adev) {
|
|
dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
|
|
&d_min, &d_max);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (d_max_in < d_min)
|
|
return -EINVAL;
|
|
|
|
if (d_max > d_max_in) {
|
|
for (d_max = d_max_in; d_max > d_min; d_max--) {
|
|
if (adev->power.states[d_max].flags.valid)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
|
|
return d_max;
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_sleep_state);
|
|
|
|
/**
|
|
* acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
|
|
* @work: Work item to handle.
|
|
*/
|
|
static void acpi_pm_notify_work_func(struct work_struct *work)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = container_of(work, struct acpi_device_wakeup_context, work)->dev;
|
|
if (dev) {
|
|
pm_wakeup_event(dev, 0);
|
|
pm_runtime_resume(dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_device_wakeup - Enable/disable wakeup functionality for device.
|
|
* @adev: ACPI device to enable/disable wakeup functionality for.
|
|
* @target_state: State the system is transitioning into.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*
|
|
* Enable/disable the GPE associated with @adev so that it can generate
|
|
* wakeup signals for the device in response to external (remote) events and
|
|
* enable/disable device wakeup power.
|
|
*
|
|
* Callers must ensure that @adev is a valid ACPI device node before executing
|
|
* this function.
|
|
*/
|
|
static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state,
|
|
bool enable)
|
|
{
|
|
struct acpi_device_wakeup *wakeup = &adev->wakeup;
|
|
|
|
if (enable) {
|
|
acpi_status res;
|
|
int error;
|
|
|
|
error = acpi_enable_wakeup_device_power(adev, target_state);
|
|
if (error)
|
|
return error;
|
|
|
|
if (adev->wakeup.flags.enabled)
|
|
return 0;
|
|
|
|
res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
if (ACPI_SUCCESS(res)) {
|
|
adev->wakeup.flags.enabled = 1;
|
|
} else {
|
|
acpi_disable_wakeup_device_power(adev);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
if (adev->wakeup.flags.enabled) {
|
|
acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
adev->wakeup.flags.enabled = 0;
|
|
}
|
|
acpi_disable_wakeup_device_power(adev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
|
|
* @dev: Device to enable/disable the platform to wake up.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*/
|
|
int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
if (!device_run_wake(phys_dev))
|
|
return -EINVAL;
|
|
|
|
adev = ACPI_COMPANION(phys_dev);
|
|
if (!adev) {
|
|
dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return acpi_device_wakeup(adev, ACPI_STATE_S0, enable);
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_run_wake);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
|
|
* @dev: Device to enable/desible to wake up the system from sleep states.
|
|
* @enable: Whether to enable or disable @dev to wake up the system.
|
|
*/
|
|
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
|
|
{
|
|
struct acpi_device *adev;
|
|
int error;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (!adev) {
|
|
dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
error = acpi_device_wakeup(adev, acpi_target_system_state(), enable);
|
|
if (!error)
|
|
dev_info(dev, "System wakeup %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* acpi_dev_pm_low_power - Put ACPI device into a low-power state.
|
|
* @dev: Device to put into a low-power state.
|
|
* @adev: ACPI device node corresponding to @dev.
|
|
* @system_state: System state to choose the device state for.
|
|
*/
|
|
static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
|
|
u32 system_state)
|
|
{
|
|
int ret, state;
|
|
|
|
if (!acpi_device_power_manageable(adev))
|
|
return 0;
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
|
|
return ret ? ret : acpi_device_set_power(adev, state);
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_full_power - Put ACPI device into the full-power state.
|
|
* @adev: ACPI device node to put into the full-power state.
|
|
*/
|
|
static int acpi_dev_pm_full_power(struct acpi_device *adev)
|
|
{
|
|
return acpi_device_power_manageable(adev) ?
|
|
acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a runtime low-power state using the standard ACPI
|
|
* mechanism. Set up remote wakeup if desired, choose the state to put the
|
|
* device into (this checks if remote wakeup is expected to work too), and set
|
|
* the power state of the device.
|
|
*/
|
|
int acpi_dev_runtime_suspend(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
bool remote_wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) >
|
|
PM_QOS_FLAGS_NONE;
|
|
error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup);
|
|
if (remote_wakeup && error)
|
|
return -EAGAIN;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
if (error)
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism at run time. Set the power state of the device to ACPI D0 and
|
|
* disable remote wakeup.
|
|
*/
|
|
int acpi_dev_runtime_resume(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_suspend - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic runtime suspend procedure for @dev and use ACPI to put
|
|
* it into a runtime low-power state.
|
|
*/
|
|
int acpi_subsys_runtime_suspend(struct device *dev)
|
|
{
|
|
int ret = pm_generic_runtime_suspend(dev);
|
|
return ret ? ret : acpi_dev_runtime_suspend(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_resume - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic runtime resume procedure for it.
|
|
*/
|
|
int acpi_subsys_runtime_resume(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_runtime_resume(dev);
|
|
return ret ? ret : pm_generic_runtime_resume(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_dev_suspend_late - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a low-power state during system transition to a
|
|
* sleep state using the standard ACPI mechanism. Set up system wakeup if
|
|
* desired, choose the state to put the device into (this checks if system
|
|
* wakeup is expected to work too), and set the power state of the device.
|
|
*/
|
|
int acpi_dev_suspend_late(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
u32 target_state;
|
|
bool wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
target_state = acpi_target_system_state();
|
|
wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev);
|
|
error = acpi_device_wakeup(adev, target_state, wakeup);
|
|
if (wakeup && error)
|
|
return error;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, target_state);
|
|
if (error)
|
|
acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);
|
|
|
|
/**
|
|
* acpi_dev_resume_early - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism during system transition to the working state. Set the power
|
|
* state of the device to ACPI D0 and disable remote wakeup.
|
|
*/
|
|
int acpi_dev_resume_early(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_resume_early);
|
|
|
|
/**
|
|
* acpi_subsys_prepare - Prepare device for system transition to a sleep state.
|
|
* @dev: Device to prepare.
|
|
*/
|
|
int acpi_subsys_prepare(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
u32 sys_target;
|
|
int ret, state;
|
|
|
|
ret = pm_generic_prepare(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!adev || !pm_runtime_suspended(dev)
|
|
|| device_may_wakeup(dev) != !!adev->wakeup.prepare_count)
|
|
return 0;
|
|
|
|
sys_target = acpi_target_system_state();
|
|
if (sys_target == ACPI_STATE_S0)
|
|
return 1;
|
|
|
|
if (adev->power.flags.dsw_present)
|
|
return 0;
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
|
|
return !ret && state == adev->power.state;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
|
|
|
|
/**
|
|
* acpi_subsys_suspend - Run the device driver's suspend callback.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Follow PCI and resume devices suspended at run time before running their
|
|
* system suspend callbacks.
|
|
*/
|
|
int acpi_subsys_suspend(struct device *dev)
|
|
{
|
|
pm_runtime_resume(dev);
|
|
return pm_generic_suspend(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
|
|
|
|
/**
|
|
* acpi_subsys_suspend_late - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic late suspend procedure for @dev and use ACPI to put
|
|
* it into a low-power state during system transition into a sleep state.
|
|
*/
|
|
int acpi_subsys_suspend_late(struct device *dev)
|
|
{
|
|
int ret = pm_generic_suspend_late(dev);
|
|
return ret ? ret : acpi_dev_suspend_late(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
|
|
|
|
/**
|
|
* acpi_subsys_resume_early - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic early resume procedure for it during system transition into the
|
|
* working state.
|
|
*/
|
|
int acpi_subsys_resume_early(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_resume_early(dev);
|
|
return ret ? ret : pm_generic_resume_early(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
|
|
|
|
/**
|
|
* acpi_subsys_freeze - Run the device driver's freeze callback.
|
|
* @dev: Device to handle.
|
|
*/
|
|
int acpi_subsys_freeze(struct device *dev)
|
|
{
|
|
/*
|
|
* This used to be done in acpi_subsys_prepare() for all devices and
|
|
* some drivers may depend on it, so do it here. Ideally, however,
|
|
* runtime-suspended devices should not be touched during freeze/thaw
|
|
* transitions.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
return pm_generic_freeze(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static struct dev_pm_domain acpi_general_pm_domain = {
|
|
.ops = {
|
|
.runtime_suspend = acpi_subsys_runtime_suspend,
|
|
.runtime_resume = acpi_subsys_runtime_resume,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.prepare = acpi_subsys_prepare,
|
|
.complete = pm_complete_with_resume_check,
|
|
.suspend = acpi_subsys_suspend,
|
|
.suspend_late = acpi_subsys_suspend_late,
|
|
.resume_early = acpi_subsys_resume_early,
|
|
.freeze = acpi_subsys_freeze,
|
|
.poweroff = acpi_subsys_suspend,
|
|
.poweroff_late = acpi_subsys_suspend_late,
|
|
.restore_early = acpi_subsys_resume_early,
|
|
#endif
|
|
},
|
|
};
|
|
|
|
/**
|
|
* acpi_dev_pm_detach - Remove ACPI power management from the device.
|
|
* @dev: Device to take care of.
|
|
* @power_off: Whether or not to try to remove power from the device.
|
|
*
|
|
* Remove the device from the general ACPI PM domain and remove its wakeup
|
|
* notifier. If @power_off is set, additionally remove power from the device if
|
|
* possible.
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
static void acpi_dev_pm_detach(struct device *dev, bool power_off)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
|
|
if (adev && dev->pm_domain == &acpi_general_pm_domain) {
|
|
dev_pm_domain_set(dev, NULL);
|
|
acpi_remove_pm_notifier(adev);
|
|
if (power_off) {
|
|
/*
|
|
* If the device's PM QoS resume latency limit or flags
|
|
* have been exposed to user space, they have to be
|
|
* hidden at this point, so that they don't affect the
|
|
* choice of the low-power state to put the device into.
|
|
*/
|
|
dev_pm_qos_hide_latency_limit(dev);
|
|
dev_pm_qos_hide_flags(dev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_attach - Prepare device for ACPI power management.
|
|
* @dev: Device to prepare.
|
|
* @power_on: Whether or not to power on the device.
|
|
*
|
|
* If @dev has a valid ACPI handle that has a valid struct acpi_device object
|
|
* attached to it, install a wakeup notification handler for the device and
|
|
* add it to the general ACPI PM domain. If @power_on is set, the device will
|
|
* be put into the ACPI D0 state before the function returns.
|
|
*
|
|
* This assumes that the @dev's bus type uses generic power management callbacks
|
|
* (or doesn't use any power management callbacks at all).
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
int acpi_dev_pm_attach(struct device *dev, bool power_on)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
|
|
if (!adev)
|
|
return -ENODEV;
|
|
|
|
if (dev->pm_domain)
|
|
return -EEXIST;
|
|
|
|
/*
|
|
* Only attach the power domain to the first device if the
|
|
* companion is shared by multiple. This is to prevent doing power
|
|
* management twice.
|
|
*/
|
|
if (!acpi_device_is_first_physical_node(adev, dev))
|
|
return -EBUSY;
|
|
|
|
acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
|
|
dev_pm_domain_set(dev, &acpi_general_pm_domain);
|
|
if (power_on) {
|
|
acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
}
|
|
|
|
dev->pm_domain->detach = acpi_dev_pm_detach;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
|
|
#endif /* CONFIG_PM */
|