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1340 lines
37 KiB
1340 lines
37 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/acpi/device_pm.c - ACPI device power management routines. |
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* |
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* Copyright (C) 2012, Intel Corp. |
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* Author: Rafael J. Wysocki <[email protected]> |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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* |
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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*/ |
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|
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#define pr_fmt(fmt) "ACPI: PM: " fmt |
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|
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#include <linux/acpi.h> |
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#include <linux/export.h> |
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#include <linux/mutex.h> |
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#include <linux/pm_qos.h> |
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#include <linux/pm_domain.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/suspend.h> |
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|
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#include "internal.h" |
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|
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/** |
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* acpi_power_state_string - String representation of ACPI device power state. |
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* @state: ACPI device power state to return the string representation of. |
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*/ |
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const char *acpi_power_state_string(int state) |
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{ |
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switch (state) { |
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case ACPI_STATE_D0: |
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return "D0"; |
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case ACPI_STATE_D1: |
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return "D1"; |
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case ACPI_STATE_D2: |
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return "D2"; |
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case ACPI_STATE_D3_HOT: |
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return "D3hot"; |
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case ACPI_STATE_D3_COLD: |
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return "D3cold"; |
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default: |
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return "(unknown)"; |
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} |
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} |
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|
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static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state) |
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{ |
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unsigned long long psc; |
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acpi_status status; |
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|
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status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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|
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*state = psc; |
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return 0; |
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} |
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|
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/** |
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* acpi_device_get_power - Get power state of an ACPI device. |
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* @device: Device to get the power state of. |
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* @state: Place to store the power state of the device. |
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* |
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* This function does not update the device's power.state field, but it may |
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* update its parent's power.state field (when the parent's power state is |
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* unknown and the device's power state turns out to be D0). |
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* |
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* Also, it does not update power resource reference counters to ensure that |
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* the power state returned by it will be persistent and it may return a power |
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* state shallower than previously set by acpi_device_set_power() for @device |
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* (if that power state depends on any power resources). |
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*/ |
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int acpi_device_get_power(struct acpi_device *device, int *state) |
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{ |
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int result = ACPI_STATE_UNKNOWN; |
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int error; |
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|
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if (!device || !state) |
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return -EINVAL; |
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|
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if (!device->flags.power_manageable) { |
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/* TBD: Non-recursive algorithm for walking up hierarchy. */ |
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*state = device->parent ? |
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device->parent->power.state : ACPI_STATE_D0; |
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goto out; |
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} |
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|
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/* |
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* Get the device's power state from power resources settings and _PSC, |
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* if available. |
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*/ |
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if (device->power.flags.power_resources) { |
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error = acpi_power_get_inferred_state(device, &result); |
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if (error) |
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return error; |
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} |
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if (device->power.flags.explicit_get) { |
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int psc; |
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|
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error = acpi_dev_pm_explicit_get(device, &psc); |
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if (error) |
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return error; |
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|
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/* |
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* The power resources settings may indicate a power state |
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* shallower than the actual power state of the device, because |
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* the same power resources may be referenced by other devices. |
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* |
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* For systems predating ACPI 4.0 we assume that D3hot is the |
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* deepest state that can be supported. |
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*/ |
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if (psc > result && psc < ACPI_STATE_D3_COLD) |
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result = psc; |
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else if (result == ACPI_STATE_UNKNOWN) |
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result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
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} |
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|
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/* |
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* If we were unsure about the device parent's power state up to this |
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* point, the fact that the device is in D0 implies that the parent has |
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* to be in D0 too, except if ignore_parent is set. |
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*/ |
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if (!device->power.flags.ignore_parent && device->parent |
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&& device->parent->power.state == ACPI_STATE_UNKNOWN |
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&& result == ACPI_STATE_D0) |
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device->parent->power.state = ACPI_STATE_D0; |
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|
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*state = result; |
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|
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out: |
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dev_dbg(&device->dev, "Device power state is %s\n", |
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acpi_power_state_string(*state)); |
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|
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return 0; |
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} |
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|
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static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
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{ |
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if (adev->power.states[state].flags.explicit_set) { |
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char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; |
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acpi_status status; |
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|
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status = acpi_evaluate_object(adev->handle, method, NULL, NULL); |
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if (ACPI_FAILURE(status)) |
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return -ENODEV; |
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} |
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return 0; |
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} |
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|
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/** |
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* acpi_device_set_power - Set power state of an ACPI device. |
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* @device: Device to set the power state of. |
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* @state: New power state to set. |
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* |
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* Callers must ensure that the device is power manageable before using this |
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* function. |
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*/ |
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int acpi_device_set_power(struct acpi_device *device, int state) |
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{ |
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int target_state = state; |
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int result = 0; |
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|
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if (!device || !device->flags.power_manageable |
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|| (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
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return -EINVAL; |
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|
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acpi_handle_debug(device->handle, "Power state change: %s -> %s\n", |
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acpi_power_state_string(device->power.state), |
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acpi_power_state_string(state)); |
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|
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/* Make sure this is a valid target state */ |
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|
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/* There is a special case for D0 addressed below. */ |
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if (state > ACPI_STATE_D0 && state == device->power.state) { |
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dev_dbg(&device->dev, "Device already in %s\n", |
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acpi_power_state_string(state)); |
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return 0; |
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} |
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|
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if (state == ACPI_STATE_D3_COLD) { |
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/* |
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* For transitions to D3cold we need to execute _PS3 and then |
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* possibly drop references to the power resources in use. |
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*/ |
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state = ACPI_STATE_D3_HOT; |
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/* If D3cold is not supported, use D3hot as the target state. */ |
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if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) |
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target_state = state; |
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} else if (!device->power.states[state].flags.valid) { |
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dev_warn(&device->dev, "Power state %s not supported\n", |
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acpi_power_state_string(state)); |
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return -ENODEV; |
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} |
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|
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if (!device->power.flags.ignore_parent && |
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device->parent && (state < device->parent->power.state)) { |
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dev_warn(&device->dev, |
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"Cannot transition to power state %s for parent in %s\n", |
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acpi_power_state_string(state), |
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acpi_power_state_string(device->parent->power.state)); |
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return -ENODEV; |
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} |
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|
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/* |
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* Transition Power |
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* ---------------- |
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* In accordance with ACPI 6, _PSx is executed before manipulating power |
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* resources, unless the target state is D0, in which case _PS0 is |
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* supposed to be executed after turning the power resources on. |
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*/ |
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if (state > ACPI_STATE_D0) { |
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/* |
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* According to ACPI 6, devices cannot go from lower-power |
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* (deeper) states to higher-power (shallower) states. |
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*/ |
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if (state < device->power.state) { |
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dev_warn(&device->dev, "Cannot transition from %s to %s\n", |
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acpi_power_state_string(device->power.state), |
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acpi_power_state_string(state)); |
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return -ENODEV; |
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} |
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|
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/* |
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* If the device goes from D3hot to D3cold, _PS3 has been |
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* evaluated for it already, so skip it in that case. |
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*/ |
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if (device->power.state < ACPI_STATE_D3_HOT) { |
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result = acpi_dev_pm_explicit_set(device, state); |
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if (result) |
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goto end; |
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} |
|
|
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if (device->power.flags.power_resources) |
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result = acpi_power_transition(device, target_state); |
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} else { |
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int cur_state = device->power.state; |
|
|
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if (device->power.flags.power_resources) { |
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result = acpi_power_transition(device, ACPI_STATE_D0); |
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if (result) |
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goto end; |
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} |
|
|
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if (cur_state == ACPI_STATE_D0) { |
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int psc; |
|
|
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/* Nothing to do here if _PSC is not present. */ |
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if (!device->power.flags.explicit_get) |
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return 0; |
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|
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/* |
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* The power state of the device was set to D0 last |
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* time, but that might have happened before a |
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* system-wide transition involving the platform |
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* firmware, so it may be necessary to evaluate _PS0 |
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* for the device here. However, use extra care here |
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* and evaluate _PSC to check the device's current power |
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* state, and only invoke _PS0 if the evaluation of _PSC |
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* is successful and it returns a power state different |
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* from D0. |
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*/ |
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result = acpi_dev_pm_explicit_get(device, &psc); |
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if (result || psc == ACPI_STATE_D0) |
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return 0; |
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} |
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|
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result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); |
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} |
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|
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end: |
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if (result) { |
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dev_warn(&device->dev, "Failed to change power state to %s\n", |
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acpi_power_state_string(target_state)); |
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} else { |
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device->power.state = target_state; |
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dev_dbg(&device->dev, "Power state changed to %s\n", |
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acpi_power_state_string(target_state)); |
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} |
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|
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return result; |
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} |
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EXPORT_SYMBOL(acpi_device_set_power); |
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|
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int acpi_bus_set_power(acpi_handle handle, int state) |
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{ |
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struct acpi_device *device; |
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int result; |
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|
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result = acpi_bus_get_device(handle, &device); |
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if (result) |
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return result; |
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|
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return acpi_device_set_power(device, state); |
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} |
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EXPORT_SYMBOL(acpi_bus_set_power); |
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|
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int acpi_bus_init_power(struct acpi_device *device) |
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{ |
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int state; |
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int result; |
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|
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if (!device) |
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return -EINVAL; |
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|
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device->power.state = ACPI_STATE_UNKNOWN; |
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if (!acpi_device_is_present(device)) { |
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device->flags.initialized = false; |
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return -ENXIO; |
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} |
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|
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result = acpi_device_get_power(device, &state); |
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if (result) |
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return result; |
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|
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if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
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/* Reference count the power resources. */ |
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result = acpi_power_on_resources(device, state); |
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if (result) |
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return result; |
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|
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if (state == ACPI_STATE_D0) { |
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/* |
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* If _PSC is not present and the state inferred from |
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* power resources appears to be D0, it still may be |
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* necessary to execute _PS0 at this point, because |
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* another device using the same power resources may |
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* have been put into D0 previously and that's why we |
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* see D0 here. |
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*/ |
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result = acpi_dev_pm_explicit_set(device, state); |
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if (result) |
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return result; |
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} |
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} else if (state == ACPI_STATE_UNKNOWN) { |
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/* |
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* No power resources and missing _PSC? Cross fingers and make |
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* it D0 in hope that this is what the BIOS put the device into. |
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* [We tried to force D0 here by executing _PS0, but that broke |
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* Toshiba P870-303 in a nasty way.] |
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*/ |
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state = ACPI_STATE_D0; |
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} |
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device->power.state = state; |
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return 0; |
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} |
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|
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/** |
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* acpi_device_fix_up_power - Force device with missing _PSC into D0. |
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* @device: Device object whose power state is to be fixed up. |
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* |
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* Devices without power resources and _PSC, but having _PS0 and _PS3 defined, |
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* are assumed to be put into D0 by the BIOS. However, in some cases that may |
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* not be the case and this function should be used then. |
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*/ |
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int acpi_device_fix_up_power(struct acpi_device *device) |
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{ |
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int ret = 0; |
|
|
|
if (!device->power.flags.power_resources |
|
&& !device->power.flags.explicit_get |
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&& device->power.state == ACPI_STATE_D0) |
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ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); |
|
|
|
return ret; |
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} |
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EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); |
|
|
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int acpi_device_update_power(struct acpi_device *device, int *state_p) |
|
{ |
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int state; |
|
int result; |
|
|
|
if (device->power.state == ACPI_STATE_UNKNOWN) { |
|
result = acpi_bus_init_power(device); |
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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); |
|
|
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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); |
|
|
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#ifdef CONFIG_PM |
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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_bus_get_acpi_device(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_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. |
|
* @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; |
|
int result; |
|
|
|
result = acpi_bus_get_device(handle, &device); |
|
return result ? false : 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 { |
|
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. |
|
*/ |
|
static int acpi_subsys_resume_early(struct device *dev) |
|
{ |
|
int ret; |
|
|
|
if (dev_pm_skip_resume(dev)) |
|
return 0; |
|
|
|
ret = acpi_dev_resume(dev); |
|
return ret ? ret : pm_generic_resume_early(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, |
|
.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[] = { |
|
{"PNP0C0B", }, /* Generic ACPI fan */ |
|
{"INT3404", }, /* Fan */ |
|
{"INTC1044", }, /* Fan for Tiger Lake generation */ |
|
{"INTC1048", }, /* Fan for Alder Lake generation */ |
|
{} |
|
}; |
|
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); |
|
#endif /* CONFIG_PM */
|
|
|