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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * drivers/acpi/device_pm.c - ACPI device power management routines.
- *
- * Copyright (C) 2012, Intel Corp.
- * Author: Rafael J. Wysocki <[email protected]>
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
- #define pr_fmt(fmt) "PM: " fmt
- #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 <linux/suspend.h>
- #include "fan.h"
- #include "internal.h"
- /**
- * 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)";
- }
- }
- static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)
- {
- unsigned long long psc;
- acpi_status status;
- status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);
- if (ACPI_FAILURE(status))
- return -ENODEV;
- *state = psc;
- return 0;
- }
- /**
- * 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).
- *
- * Also, it does not update power resource reference counters to ensure that
- * the power state returned by it will be persistent and it may return a power
- * state shallower than previously set by acpi_device_set_power() for @device
- * (if that power state depends on any power resources).
- */
- int acpi_device_get_power(struct acpi_device *device, int *state)
- {
- int result = ACPI_STATE_UNKNOWN;
- struct acpi_device *parent;
- int error;
- if (!device || !state)
- return -EINVAL;
- parent = acpi_dev_parent(device);
- if (!device->flags.power_manageable) {
- /* TBD: Non-recursive algorithm for walking up hierarchy. */
- *state = parent ? 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) {
- error = acpi_power_get_inferred_state(device, &result);
- if (error)
- return error;
- }
- if (device->power.flags.explicit_get) {
- int psc;
- error = acpi_dev_pm_explicit_get(device, &psc);
- if (error)
- return error;
- /*
- * 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 && parent &&
- parent->power.state == ACPI_STATE_UNKNOWN &&
- result == ACPI_STATE_D0)
- parent->power.state = ACPI_STATE_D0;
- *state = result;
- out:
- acpi_handle_debug(device->handle, "Power state: %s\n",
- 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;
- acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
- acpi_power_state_string(device->power.state),
- acpi_power_state_string(state));
- /* Make sure this is a valid target state */
- /* There is a special case for D0 addressed below. */
- if (state > ACPI_STATE_D0 && state == device->power.state)
- goto no_change;
- 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 D3cold is not supported, 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) {
- acpi_handle_debug(device->handle, "Power state %s not supported\n",
- acpi_power_state_string(state));
- return -ENODEV;
- }
- if (!device->power.flags.ignore_parent) {
- struct acpi_device *parent;
- parent = acpi_dev_parent(device);
- if (parent && state < parent->power.state) {
- acpi_handle_debug(device->handle,
- "Cannot transition to %s for parent in %s\n",
- acpi_power_state_string(state),
- acpi_power_state_string(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) {
- acpi_handle_debug(device->handle,
- "Cannot transition from %s to %s\n",
- acpi_power_state_string(device->power.state),
- acpi_power_state_string(state));
- return -ENODEV;
- }
- /*
- * If the device goes from D3hot to D3cold, _PS3 has been
- * evaluated for it already, so skip it in that case.
- */
- if (device->power.state < ACPI_STATE_D3_HOT) {
- 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 {
- int cur_state = device->power.state;
- if (device->power.flags.power_resources) {
- result = acpi_power_transition(device, ACPI_STATE_D0);
- if (result)
- goto end;
- }
- if (cur_state == ACPI_STATE_D0) {
- int psc;
- /* Nothing to do here if _PSC is not present. */
- if (!device->power.flags.explicit_get)
- goto no_change;
- /*
- * The power state of the device was set to D0 last
- * time, but that might have happened before a
- * system-wide transition involving the platform
- * firmware, so it may be necessary to evaluate _PS0
- * for the device here. However, use extra care here
- * and evaluate _PSC to check the device's current power
- * state, and only invoke _PS0 if the evaluation of _PSC
- * is successful and it returns a power state different
- * from D0.
- */
- result = acpi_dev_pm_explicit_get(device, &psc);
- if (result || psc == ACPI_STATE_D0)
- goto no_change;
- }
- result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
- }
- end:
- if (result) {
- acpi_handle_debug(device->handle,
- "Failed to change power state to %s\n",
- acpi_power_state_string(target_state));
- } else {
- device->power.state = target_state;
- acpi_handle_debug(device->handle, "Power state changed to %s\n",
- acpi_power_state_string(target_state));
- }
- return result;
- no_change:
- acpi_handle_debug(device->handle, "Already in %s\n",
- acpi_power_state_string(state));
- return 0;
- }
- EXPORT_SYMBOL(acpi_device_set_power);
- int acpi_bus_set_power(acpi_handle handle, int state)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- if (device)
- return acpi_device_set_power(device, state);
- return -ENODEV;
- }
- 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)) {
- device->flags.initialized = false;
- 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);
- static int fix_up_power_if_applicable(struct acpi_device *adev, void *not_used)
- {
- if (adev->status.present && adev->status.enabled)
- acpi_device_fix_up_power(adev);
- return 0;
- }
- /**
- * acpi_device_fix_up_power_extended - Force device and its children into D0.
- * @adev: Parent device object whose power state is to be fixed up.
- *
- * Call acpi_device_fix_up_power() for @adev and its children so long as they
- * are reported as present and enabled.
- */
- void acpi_device_fix_up_power_extended(struct acpi_device *adev)
- {
- acpi_device_fix_up_power(adev);
- acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL);
- }
- EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended);
- 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 = acpi_fetch_acpi_dev(handle);
- if (device)
- return acpi_device_update_power(device, state_p);
- return -ENODEV;
- }
- EXPORT_SYMBOL_GPL(acpi_bus_update_power);
- bool acpi_bus_power_manageable(acpi_handle handle)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- return device && device->flags.power_manageable;
- }
- EXPORT_SYMBOL(acpi_bus_power_manageable);
- static int acpi_power_up_if_adr_present(struct acpi_device *adev, void *not_used)
- {
- if (!(adev->flags.power_manageable && adev->pnp.type.bus_address))
- return 0;
- acpi_handle_debug(adev->handle, "Power state: %s\n",
- acpi_power_state_string(adev->power.state));
- if (adev->power.state == ACPI_STATE_D3_COLD)
- return acpi_device_set_power(adev, ACPI_STATE_D0);
- return 0;
- }
- /**
- * acpi_dev_power_up_children_with_adr - Power up childres with valid _ADR
- * @adev: Parent ACPI device object.
- *
- * Change the power states of the direct children of @adev that are in D3cold
- * and hold valid _ADR objects to D0 in order to allow bus (e.g. PCI)
- * enumeration code to access them.
- */
- void acpi_dev_power_up_children_with_adr(struct acpi_device *adev)
- {
- acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL);
- }
- /**
- * acpi_dev_power_state_for_wake - Deepest power state for wakeup signaling
- * @adev: ACPI companion of the target device.
- *
- * Evaluate _S0W for @adev and return the value produced by it or return
- * ACPI_STATE_UNKNOWN on errors (including _S0W not present).
- */
- u8 acpi_dev_power_state_for_wake(struct acpi_device *adev)
- {
- unsigned long long state;
- acpi_status status;
- status = acpi_evaluate_integer(adev->handle, "_S0W", NULL, &state);
- if (ACPI_FAILURE(status))
- return ACPI_STATE_UNKNOWN;
- return state;
- }
- #ifdef CONFIG_PM
- static DEFINE_MUTEX(acpi_pm_notifier_lock);
- static DEFINE_MUTEX(acpi_pm_notifier_install_lock);
- void acpi_pm_wakeup_event(struct device *dev)
- {
- pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup());
- }
- EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event);
- 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;
- acpi_handle_debug(handle, "Wake notify\n");
- adev = acpi_get_acpi_dev(handle);
- if (!adev)
- return;
- mutex_lock(&acpi_pm_notifier_lock);
- if (adev->wakeup.flags.notifier_present) {
- pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup());
- if (adev->wakeup.context.func) {
- acpi_handle_debug(handle, "Running %pS for %s\n",
- adev->wakeup.context.func,
- dev_name(adev->wakeup.context.dev));
- adev->wakeup.context.func(&adev->wakeup.context);
- }
- }
- mutex_unlock(&acpi_pm_notifier_lock);
- acpi_put_acpi_dev(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.
- * @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 (*func)(struct acpi_device_wakeup_context *context))
- {
- acpi_status status = AE_ALREADY_EXISTS;
- if (!dev && !func)
- return AE_BAD_PARAMETER;
- mutex_lock(&acpi_pm_notifier_install_lock);
- if (adev->wakeup.flags.notifier_present)
- goto out;
- status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
- acpi_pm_notify_handler, NULL);
- if (ACPI_FAILURE(status))
- goto out;
- mutex_lock(&acpi_pm_notifier_lock);
- adev->wakeup.ws = wakeup_source_register(&adev->dev,
- dev_name(&adev->dev));
- adev->wakeup.context.dev = dev;
- adev->wakeup.context.func = func;
- adev->wakeup.flags.notifier_present = true;
- mutex_unlock(&acpi_pm_notifier_lock);
- out:
- mutex_unlock(&acpi_pm_notifier_install_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_install_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;
- mutex_lock(&acpi_pm_notifier_lock);
- adev->wakeup.context.func = NULL;
- adev->wakeup.context.dev = NULL;
- wakeup_source_unregister(adev->wakeup.ws);
- adev->wakeup.flags.notifier_present = false;
- mutex_unlock(&acpi_pm_notifier_lock);
- out:
- mutex_unlock(&acpi_pm_notifier_install_lock);
- return status;
- }
- bool acpi_bus_can_wakeup(acpi_handle handle)
- {
- struct acpi_device *device = acpi_fetch_acpi_dev(handle);
- return device && device->wakeup.flags.valid;
- }
- EXPORT_SYMBOL(acpi_bus_can_wakeup);
- bool acpi_pm_device_can_wakeup(struct device *dev)
- {
- struct acpi_device *adev = ACPI_COMPANION(dev);
- return adev ? acpi_device_can_wakeup(adev) : false;
- }
- /**
- * 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;
- bool has_sxd = 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;
- }
- if (status == AE_OK)
- has_sxd = true;
- d_min = ret;
- wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
- && adev->wakeup.sleep_state >= target_state;
- } else if (device_may_wakeup(dev) && dev->power.wakeirq) {
- /*
- * The ACPI subsystem doesn't manage the wake bit for IRQs
- * defined with ExclusiveAndWake and SharedAndWake. Instead we
- * expect them to be managed via the PM subsystem. Drivers
- * should call dev_pm_set_wake_irq to register an IRQ as a wake
- * source.
- *
- * If a device has a wake IRQ attached we need to check the
- * _S0W method to get the correct wake D-state. Otherwise we
- * end up putting the device into D3Cold which will more than
- * likely disable wake functionality.
- */
- wakeup = true;
- } else {
- /* ACPI GPE is specified in _PRW. */
- 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) {
- /* No _SxW. In this case, the ACPI spec says that we
- * must not go into any power state deeper than the
- * value returned from _SxD.
- */
- if (has_sxd && 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.
- * @context: Device wakeup context.
- */
- static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context)
- {
- struct device *dev = context->dev;
- if (dev) {
- pm_wakeup_event(dev, 0);
- pm_request_resume(dev);
- }
- }
- static DEFINE_MUTEX(acpi_wakeup_lock);
- static int __acpi_device_wakeup_enable(struct acpi_device *adev,
- u32 target_state)
- {
- struct acpi_device_wakeup *wakeup = &adev->wakeup;
- acpi_status status;
- int error = 0;
- mutex_lock(&acpi_wakeup_lock);
- /*
- * If the device wakeup power is already enabled, disable it and enable
- * it again in case it depends on the configuration of subordinate
- * devices and the conditions have changed since it was enabled last
- * time.
- */
- if (wakeup->enable_count > 0)
- acpi_disable_wakeup_device_power(adev);
- error = acpi_enable_wakeup_device_power(adev, target_state);
- if (error) {
- if (wakeup->enable_count > 0) {
- acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
- wakeup->enable_count = 0;
- }
- goto out;
- }
- if (wakeup->enable_count > 0)
- goto inc;
- status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
- if (ACPI_FAILURE(status)) {
- acpi_disable_wakeup_device_power(adev);
- error = -EIO;
- goto out;
- }
- acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n",
- (unsigned int)wakeup->gpe_number);
- inc:
- if (wakeup->enable_count < INT_MAX)
- wakeup->enable_count++;
- else
- acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n");
- out:
- mutex_unlock(&acpi_wakeup_lock);
- return error;
- }
- /**
- * acpi_device_wakeup_enable - Enable wakeup functionality for device.
- * @adev: ACPI device to enable wakeup functionality for.
- * @target_state: State the system is transitioning into.
- *
- * Enable the GPE associated with @adev so that it can generate wakeup signals
- * for the device in response to external (remote) events and enable wakeup
- * power for it.
- *
- * Callers must ensure that @adev is a valid ACPI device node before executing
- * this function.
- */
- static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state)
- {
- return __acpi_device_wakeup_enable(adev, target_state);
- }
- /**
- * acpi_device_wakeup_disable - Disable wakeup functionality for device.
- * @adev: ACPI device to disable wakeup functionality for.
- *
- * Disable the GPE associated with @adev and disable wakeup power for it.
- *
- * Callers must ensure that @adev is a valid ACPI device node before executing
- * this function.
- */
- static void acpi_device_wakeup_disable(struct acpi_device *adev)
- {
- struct acpi_device_wakeup *wakeup = &adev->wakeup;
- mutex_lock(&acpi_wakeup_lock);
- if (!wakeup->enable_count)
- goto out;
- acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
- acpi_disable_wakeup_device_power(adev);
- wakeup->enable_count--;
- out:
- mutex_unlock(&acpi_wakeup_lock);
- }
- /**
- * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device.
- * @dev: Device to enable/disable to generate wakeup events.
- * @enable: Whether to enable or disable the wakeup functionality.
- */
- int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
- {
- struct acpi_device *adev;
- int error;
- adev = ACPI_COMPANION(dev);
- if (!adev) {
- dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
- return -ENODEV;
- }
- if (!acpi_device_can_wakeup(adev))
- return -EINVAL;
- if (!enable) {
- acpi_device_wakeup_disable(adev);
- dev_dbg(dev, "Wakeup disabled by ACPI\n");
- return 0;
- }
- error = __acpi_device_wakeup_enable(adev, acpi_target_system_state());
- if (!error)
- dev_dbg(dev, "Wakeup enabled by ACPI\n");
- return error;
- }
- EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup);
- /**
- * 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_suspend - Put device into a low-power state using ACPI.
- * @dev: Device to put into a low-power state.
- * @wakeup: Whether or not to enable wakeup for the device.
- *
- * Put the given device into a 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_suspend(struct device *dev, bool wakeup)
- {
- struct acpi_device *adev = ACPI_COMPANION(dev);
- u32 target_state = acpi_target_system_state();
- int error;
- if (!adev)
- return 0;
- if (wakeup && acpi_device_can_wakeup(adev)) {
- error = acpi_device_wakeup_enable(adev, target_state);
- if (error)
- return -EAGAIN;
- } else {
- wakeup = false;
- }
- error = acpi_dev_pm_low_power(dev, adev, target_state);
- if (error && wakeup)
- acpi_device_wakeup_disable(adev);
- return error;
- }
- EXPORT_SYMBOL_GPL(acpi_dev_suspend);
- /**
- * acpi_dev_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. Set the power state of the device to ACPI D0 and disable wakeup.
- */
- int acpi_dev_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_disable(adev);
- return error;
- }
- EXPORT_SYMBOL_GPL(acpi_dev_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_suspend(dev, true);
- }
- 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_resume(dev);
- return ret ? ret : pm_generic_runtime_resume(dev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
- #ifdef CONFIG_PM_SLEEP
- static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)
- {
- u32 sys_target = acpi_target_system_state();
- int ret, state;
- if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid &&
- device_may_wakeup(dev) != !!adev->wakeup.prepare_count))
- return true;
- if (sys_target == ACPI_STATE_S0)
- return false;
- if (adev->power.flags.dsw_present)
- return true;
- ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
- if (ret)
- return true;
- return state != adev->power.state;
- }
- /**
- * 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);
- if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) {
- int ret = dev->driver->pm->prepare(dev);
- if (ret < 0)
- return ret;
- if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
- return 0;
- }
- return !acpi_dev_needs_resume(dev, adev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
- /**
- * acpi_subsys_complete - Finalize device's resume during system resume.
- * @dev: Device to handle.
- */
- void acpi_subsys_complete(struct device *dev)
- {
- pm_generic_complete(dev);
- /*
- * If the device had been runtime-suspended before the system went into
- * the sleep state it is going out of and it has never been resumed till
- * now, resume it in case the firmware powered it up.
- */
- if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
- pm_request_resume(dev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_complete);
- /**
- * acpi_subsys_suspend - Run the device driver's suspend callback.
- * @dev: Device to handle.
- *
- * Follow PCI and resume devices from runtime suspend before running their
- * system suspend callbacks, unless the driver can cope with runtime-suspended
- * devices during system suspend and there are no ACPI-specific reasons for
- * resuming them.
- */
- int acpi_subsys_suspend(struct device *dev)
- {
- if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
- acpi_dev_needs_resume(dev, ACPI_COMPANION(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;
- if (dev_pm_skip_suspend(dev))
- return 0;
- ret = pm_generic_suspend_late(dev);
- return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev));
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
- /**
- * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback.
- * @dev: Device to suspend.
- */
- int acpi_subsys_suspend_noirq(struct device *dev)
- {
- int ret;
- if (dev_pm_skip_suspend(dev))
- return 0;
- ret = pm_generic_suspend_noirq(dev);
- if (ret)
- return ret;
- /*
- * If the target system sleep state is suspend-to-idle, it is sufficient
- * to check whether or not the device's wakeup settings are good for
- * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
- * acpi_subsys_complete() to take care of fixing up the device's state
- * anyway, if need be.
- */
- if (device_can_wakeup(dev) && !device_may_wakeup(dev))
- dev->power.may_skip_resume = false;
- return 0;
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
- /**
- * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback.
- * @dev: Device to handle.
- */
- static int acpi_subsys_resume_noirq(struct device *dev)
- {
- if (dev_pm_skip_resume(dev))
- return 0;
- return pm_generic_resume_noirq(dev);
- }
- /**
- * 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, but only do that if device either defines early resume
- * handler, or does not define power operations at all. Otherwise powering up
- * of the device is postponed to the normal resume phase.
- */
- static int acpi_subsys_resume_early(struct device *dev)
- {
- const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
- int ret;
- if (dev_pm_skip_resume(dev))
- return 0;
- if (pm && !pm->resume_early) {
- dev_dbg(dev, "postponing D0 transition to normal resume stage\n");
- return 0;
- }
- ret = acpi_dev_resume(dev);
- return ret ? ret : pm_generic_resume_early(dev);
- }
- /**
- * acpi_subsys_resume - Resume device using ACPI.
- * @dev: Device to Resume.
- *
- * Use ACPI to put the given device into the full-power state if it has not been
- * powered up during early resume phase, and carry out the generic resume
- * procedure for it during system transition into the working state.
- */
- static int acpi_subsys_resume(struct device *dev)
- {
- const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
- int ret = 0;
- if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) {
- dev_dbg(dev, "executing postponed D0 transition\n");
- ret = acpi_dev_resume(dev);
- }
- return ret ? ret : pm_generic_resume(dev);
- }
- /**
- * acpi_subsys_freeze - Run the device driver's freeze callback.
- * @dev: Device to handle.
- */
- int acpi_subsys_freeze(struct device *dev)
- {
- /*
- * Resume all runtime-suspended devices before creating a snapshot
- * image of system memory, because the restore kernel generally cannot
- * be expected to always handle them consistently and they need to be
- * put into the runtime-active metastate during system resume anyway,
- * so it is better to ensure that the state saved in the image will be
- * always consistent with that.
- */
- pm_runtime_resume(dev);
- return pm_generic_freeze(dev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
- /**
- * acpi_subsys_restore_early - Restore device using ACPI.
- * @dev: Device to restore.
- */
- int acpi_subsys_restore_early(struct device *dev)
- {
- int ret = acpi_dev_resume(dev);
- return ret ? ret : pm_generic_restore_early(dev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_restore_early);
- /**
- * acpi_subsys_poweroff - Run the device driver's poweroff callback.
- * @dev: Device to handle.
- *
- * Follow PCI and resume devices from runtime suspend before running their
- * system poweroff callbacks, unless the driver can cope with runtime-suspended
- * devices during system suspend and there are no ACPI-specific reasons for
- * resuming them.
- */
- int acpi_subsys_poweroff(struct device *dev)
- {
- if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
- acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
- pm_runtime_resume(dev);
- return pm_generic_poweroff(dev);
- }
- EXPORT_SYMBOL_GPL(acpi_subsys_poweroff);
- /**
- * acpi_subsys_poweroff_late - Run the device driver's poweroff callback.
- * @dev: Device to handle.
- *
- * Carry out the generic late poweroff procedure for @dev and use ACPI to put
- * it into a low-power state during system transition into a sleep state.
- */
- static int acpi_subsys_poweroff_late(struct device *dev)
- {
- int ret;
- if (dev_pm_skip_suspend(dev))
- return 0;
- ret = pm_generic_poweroff_late(dev);
- if (ret)
- return ret;
- return acpi_dev_suspend(dev, device_may_wakeup(dev));
- }
- /**
- * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback.
- * @dev: Device to suspend.
- */
- static int acpi_subsys_poweroff_noirq(struct device *dev)
- {
- if (dev_pm_skip_suspend(dev))
- return 0;
- return pm_generic_poweroff_noirq(dev);
- }
- #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 = acpi_subsys_complete,
- .suspend = acpi_subsys_suspend,
- .resume = acpi_subsys_resume,
- .suspend_late = acpi_subsys_suspend_late,
- .suspend_noirq = acpi_subsys_suspend_noirq,
- .resume_noirq = acpi_subsys_resume_noirq,
- .resume_early = acpi_subsys_resume_early,
- .freeze = acpi_subsys_freeze,
- .poweroff = acpi_subsys_poweroff,
- .poweroff_late = acpi_subsys_poweroff_late,
- .poweroff_noirq = acpi_subsys_poweroff_noirq,
- .restore_early = acpi_subsys_restore_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_disable(adev);
- 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)
- {
- /*
- * Skip devices whose ACPI companions match the device IDs below,
- * because they require special power management handling incompatible
- * with the generic ACPI PM domain.
- */
- static const struct acpi_device_id special_pm_ids[] = {
- ACPI_FAN_DEVICE_IDS,
- {}
- };
- struct acpi_device *adev = ACPI_COMPANION(dev);
- if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
- return 0;
- /*
- * 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 0;
- 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_disable(adev);
- }
- dev->pm_domain->detach = acpi_dev_pm_detach;
- return 1;
- }
- EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
- /**
- * acpi_storage_d3 - Check if D3 should be used in the suspend path
- * @dev: Device to check
- *
- * Return %true if the platform firmware wants @dev to be programmed
- * into D3hot or D3cold (if supported) in the suspend path, or %false
- * when there is no specific preference. On some platforms, if this
- * hint is ignored, @dev may remain unresponsive after suspending the
- * platform as a whole.
- *
- * Although the property has storage in the name it actually is
- * applied to the PCIe slot and plugging in a non-storage device the
- * same platform restrictions will likely apply.
- */
- bool acpi_storage_d3(struct device *dev)
- {
- struct acpi_device *adev = ACPI_COMPANION(dev);
- u8 val;
- if (force_storage_d3())
- return true;
- if (!adev)
- return false;
- if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
- &val))
- return false;
- return val == 1;
- }
- EXPORT_SYMBOL_GPL(acpi_storage_d3);
- /**
- * acpi_dev_state_d0 - Tell if the device is in D0 power state
- * @dev: Physical device the ACPI power state of which to check
- *
- * On a system without ACPI, return true. On a system with ACPI, return true if
- * the current ACPI power state of the device is D0, or false otherwise.
- *
- * Note that the power state of a device is not well-defined after it has been
- * passed to acpi_device_set_power() and before that function returns, so it is
- * not valid to ask for the ACPI power state of the device in that time frame.
- *
- * This function is intended to be used in a driver's probe or remove
- * function. See Documentation/firmware-guide/acpi/non-d0-probe.rst for
- * more information.
- */
- bool acpi_dev_state_d0(struct device *dev)
- {
- struct acpi_device *adev = ACPI_COMPANION(dev);
- if (!adev)
- return true;
- return adev->power.state == ACPI_STATE_D0;
- }
- EXPORT_SYMBOL_GPL(acpi_dev_state_d0);
- #endif /* CONFIG_PM */
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