| /* |
| * drivers/acpi/device_pm.c - ACPI device power management routines. |
| * |
| * Copyright (C) 2012, Intel Corp. |
| * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/export.h> |
| #include <linux/mutex.h> |
| #include <linux/pm_qos.h> |
| #include <linux/pm_runtime.h> |
| |
| #include "internal.h" |
| |
| #define _COMPONENT ACPI_POWER_COMPONENT |
| ACPI_MODULE_NAME("device_pm"); |
| |
| /** |
| * acpi_power_state_string - String representation of ACPI device power state. |
| * @state: ACPI device power state to return the string representation of. |
| */ |
| const char *acpi_power_state_string(int state) |
| { |
| switch (state) { |
| case ACPI_STATE_D0: |
| return "D0"; |
| case ACPI_STATE_D1: |
| return "D1"; |
| case ACPI_STATE_D2: |
| return "D2"; |
| case ACPI_STATE_D3_HOT: |
| return "D3hot"; |
| case ACPI_STATE_D3_COLD: |
| return "D3cold"; |
| default: |
| return "(unknown)"; |
| } |
| } |
| |
| /** |
| * acpi_device_get_power - Get power state of an ACPI device. |
| * @device: Device to get the power state of. |
| * @state: Place to store the power state of the device. |
| * |
| * This function does not update the device's power.state field, but it may |
| * update its parent's power.state field (when the parent's power state is |
| * unknown and the device's power state turns out to be D0). |
| */ |
| int acpi_device_get_power(struct acpi_device *device, int *state) |
| { |
| int result = ACPI_STATE_UNKNOWN; |
| |
| if (!device || !state) |
| return -EINVAL; |
| |
| if (!device->flags.power_manageable) { |
| /* TBD: Non-recursive algorithm for walking up hierarchy. */ |
| *state = device->parent ? |
| device->parent->power.state : ACPI_STATE_D0; |
| goto out; |
| } |
| |
| /* |
| * Get the device's power state from power resources settings and _PSC, |
| * if available. |
| */ |
| if (device->power.flags.power_resources) { |
| int error = acpi_power_get_inferred_state(device, &result); |
| if (error) |
| return error; |
| } |
| if (device->power.flags.explicit_get) { |
| acpi_handle handle = device->handle; |
| unsigned long long psc; |
| acpi_status status; |
| |
| status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); |
| if (ACPI_FAILURE(status)) |
| return -ENODEV; |
| |
| /* |
| * The power resources settings may indicate a power state |
| * shallower than the actual power state of the device. |
| * |
| * Moreover, on systems predating ACPI 4.0, if the device |
| * doesn't depend on any power resources and _PSC returns 3, |
| * that means "power off". We need to maintain compatibility |
| * with those systems. |
| */ |
| if (psc > result && psc < ACPI_STATE_D3_COLD) |
| result = psc; |
| else if (result == ACPI_STATE_UNKNOWN) |
| result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc; |
| } |
| |
| /* |
| * If we were unsure about the device parent's power state up to this |
| * point, the fact that the device is in D0 implies that the parent has |
| * to be in D0 too, except if ignore_parent is set. |
| */ |
| if (!device->power.flags.ignore_parent && device->parent |
| && device->parent->power.state == ACPI_STATE_UNKNOWN |
| && result == ACPI_STATE_D0) |
| device->parent->power.state = ACPI_STATE_D0; |
| |
| *state = result; |
| |
| out: |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", |
| device->pnp.bus_id, acpi_power_state_string(*state))); |
| |
| return 0; |
| } |
| |
| static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
| { |
| if (adev->power.states[state].flags.explicit_set) { |
| char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; |
| acpi_status status; |
| |
| status = acpi_evaluate_object(adev->handle, method, NULL, NULL); |
| if (ACPI_FAILURE(status)) |
| return -ENODEV; |
| } |
| return 0; |
| } |
| |
| /** |
| * acpi_device_set_power - Set power state of an ACPI device. |
| * @device: Device to set the power state of. |
| * @state: New power state to set. |
| * |
| * Callers must ensure that the device is power manageable before using this |
| * function. |
| */ |
| int acpi_device_set_power(struct acpi_device *device, int state) |
| { |
| int result = 0; |
| bool cut_power = false; |
| |
| if (!device || !device->flags.power_manageable |
| || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
| return -EINVAL; |
| |
| /* Make sure this is a valid target state */ |
| |
| if (state == device->power.state) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
| device->pnp.bus_id, |
| acpi_power_state_string(state))); |
| return 0; |
| } |
| |
| if (!device->power.states[state].flags.valid) { |
| dev_warn(&device->dev, "Power state %s not supported\n", |
| acpi_power_state_string(state)); |
| return -ENODEV; |
| } |
| if (!device->power.flags.ignore_parent && |
| device->parent && (state < device->parent->power.state)) { |
| dev_warn(&device->dev, |
| "Cannot transition to power state %s for parent in %s\n", |
| acpi_power_state_string(state), |
| acpi_power_state_string(device->parent->power.state)); |
| return -ENODEV; |
| } |
| |
| /* For D3cold we should first transition into D3hot. */ |
| if (state == ACPI_STATE_D3_COLD |
| && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { |
| state = ACPI_STATE_D3_HOT; |
| cut_power = true; |
| } |
| |
| if (state < device->power.state && state != ACPI_STATE_D0 |
| && device->power.state >= ACPI_STATE_D3_HOT) { |
| dev_warn(&device->dev, |
| "Cannot transition to non-D0 state from D3\n"); |
| return -ENODEV; |
| } |
| |
| /* |
| * Transition Power |
| * ---------------- |
| * In accordance with the ACPI specification first apply power (via |
| * power resources) and then evaluate _PSx. |
| */ |
| if (device->power.flags.power_resources) { |
| result = acpi_power_transition(device, state); |
| if (result) |
| goto end; |
| } |
| result = acpi_dev_pm_explicit_set(device, state); |
| if (result) |
| goto end; |
| |
| if (cut_power) { |
| device->power.state = state; |
| state = ACPI_STATE_D3_COLD; |
| result = acpi_power_transition(device, state); |
| } |
| |
| end: |
| if (result) { |
| dev_warn(&device->dev, "Failed to change power state to %s\n", |
| acpi_power_state_string(state)); |
| } else { |
| device->power.state = state; |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Device [%s] transitioned to %s\n", |
| device->pnp.bus_id, |
| acpi_power_state_string(state))); |
| } |
| |
| return result; |
| } |
| EXPORT_SYMBOL(acpi_device_set_power); |
| |
| int acpi_bus_set_power(acpi_handle handle, int state) |
| { |
| struct acpi_device *device; |
| int result; |
| |
| result = acpi_bus_get_device(handle, &device); |
| if (result) |
| return result; |
| |
| return acpi_device_set_power(device, state); |
| } |
| EXPORT_SYMBOL(acpi_bus_set_power); |
| |
| int acpi_bus_init_power(struct acpi_device *device) |
| { |
| int state; |
| int result; |
| |
| if (!device) |
| return -EINVAL; |
| |
| device->power.state = ACPI_STATE_UNKNOWN; |
| if (!acpi_device_is_present(device)) |
| return -ENXIO; |
| |
| result = acpi_device_get_power(device, &state); |
| if (result) |
| return result; |
| |
| if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
| result = acpi_power_on_resources(device, state); |
| if (result) |
| return result; |
| |
| 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; |
| } |
| |
| int acpi_device_update_power(struct acpi_device *device, int *state_p) |
| { |
| int state; |
| int result; |
| |
| if (device->power.state == ACPI_STATE_UNKNOWN) { |
| result = acpi_bus_init_power(device); |
| if (!result && state_p) |
| *state_p = device->power.state; |
| |
| return result; |
| } |
| |
| result = acpi_device_get_power(device, &state); |
| if (result) |
| return result; |
| |
| if (state == ACPI_STATE_UNKNOWN) { |
| state = ACPI_STATE_D0; |
| result = acpi_device_set_power(device, state); |
| if (result) |
| return result; |
| } else { |
| if (device->power.flags.power_resources) { |
| /* |
| * We don't need to really switch the state, bu we need |
| * to update the power resources' reference counters. |
| */ |
| result = acpi_power_transition(device, state); |
| if (result) |
| return result; |
| } |
| device->power.state = state; |
| } |
| if (state_p) |
| *state_p = state; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(acpi_device_update_power); |
| |
| int acpi_bus_update_power(acpi_handle handle, int *state_p) |
| { |
| struct acpi_device *device; |
| int result; |
| |
| result = acpi_bus_get_device(handle, &device); |
| return result ? result : acpi_device_update_power(device, state_p); |
| } |
| EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
| |
| bool acpi_bus_power_manageable(acpi_handle handle) |
| { |
| struct acpi_device *device; |
| int result; |
| |
| result = acpi_bus_get_device(handle, &device); |
| return result ? false : device->flags.power_manageable; |
| } |
| EXPORT_SYMBOL(acpi_bus_power_manageable); |
| |
| #ifdef CONFIG_PM |
| static DEFINE_MUTEX(acpi_pm_notifier_lock); |
| |
| static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
| { |
| struct acpi_device *adev; |
| |
| if (val != ACPI_NOTIFY_DEVICE_WAKE) |
| return; |
| |
| adev = acpi_bus_get_acpi_device(handle); |
| if (!adev) |
| return; |
| |
| mutex_lock(&acpi_pm_notifier_lock); |
| |
| if (adev->wakeup.flags.notifier_present) { |
| __pm_wakeup_event(adev->wakeup.ws, 0); |
| if (adev->wakeup.context.work.func) |
| queue_pm_work(&adev->wakeup.context.work); |
| } |
| |
| mutex_unlock(&acpi_pm_notifier_lock); |
| |
| acpi_bus_put_acpi_device(adev); |
| } |
| |
| /** |
| * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
| * @adev: ACPI device to add the notify handler for. |
| * @dev: Device to generate a wakeup event for while handling the notification. |
| * @work_func: Work function to execute when handling the notification. |
| * |
| * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of |
| * PM wakeup events. For example, wakeup events may be generated for bridges |
| * if one of the devices below the bridge is signaling wakeup, even if the |
| * bridge itself doesn't have a wakeup GPE associated with it. |
| */ |
| acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
| void (*work_func)(struct work_struct *work)) |
| { |
| acpi_status status = AE_ALREADY_EXISTS; |
| |
| if (!dev && !work_func) |
| return AE_BAD_PARAMETER; |
| |
| mutex_lock(&acpi_pm_notifier_lock); |
| |
| if (adev->wakeup.flags.notifier_present) |
| goto out; |
| |
| adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); |
| adev->wakeup.context.dev = dev; |
| if (work_func) |
| INIT_WORK(&adev->wakeup.context.work, work_func); |
| |
| status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, |
| acpi_pm_notify_handler, NULL); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| |
| adev->wakeup.flags.notifier_present = true; |
| |
| out: |
| mutex_unlock(&acpi_pm_notifier_lock); |
| return status; |
| } |
| |
| /** |
| * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. |
| * @adev: ACPI device to remove the notifier from. |
| */ |
| acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
| { |
| acpi_status status = AE_BAD_PARAMETER; |
| |
| mutex_lock(&acpi_pm_notifier_lock); |
| |
| if (!adev->wakeup.flags.notifier_present) |
| goto out; |
| |
| status = acpi_remove_notify_handler(adev->handle, |
| ACPI_SYSTEM_NOTIFY, |
| acpi_pm_notify_handler); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| |
| if (adev->wakeup.context.work.func) { |
| cancel_work_sync(&adev->wakeup.context.work); |
| adev->wakeup.context.work.func = NULL; |
| } |
| adev->wakeup.context.dev = NULL; |
| wakeup_source_unregister(adev->wakeup.ws); |
| |
| adev->wakeup.flags.notifier_present = false; |
| |
| out: |
| mutex_unlock(&acpi_pm_notifier_lock); |
| return status; |
| } |
| |
| bool acpi_bus_can_wakeup(acpi_handle handle) |
| { |
| struct acpi_device *device; |
| int result; |
| |
| result = acpi_bus_get_device(handle, &device); |
| return result ? false : device->wakeup.flags.valid; |
| } |
| EXPORT_SYMBOL(acpi_bus_can_wakeup); |
| |
| /** |
| * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
| * @dev: Device whose preferred target power state to return. |
| * @adev: ACPI device node corresponding to @dev. |
| * @target_state: System state to match the resultant device state. |
| * @d_min_p: Location to store the highest power state available to the device. |
| * @d_max_p: Location to store the lowest power state available to the device. |
| * |
| * Find the lowest power (highest number) and highest power (lowest number) ACPI |
| * device power states that the device can be in while the system is in the |
| * state represented by @target_state. Store the integer numbers representing |
| * those stats in the memory locations pointed to by @d_max_p and @d_min_p, |
| * respectively. |
| * |
| * Callers must ensure that @dev and @adev are valid pointers and that @adev |
| * actually corresponds to @dev before using this function. |
| * |
| * Returns 0 on success or -ENODATA when one of the ACPI methods fails or |
| * returns a value that doesn't make sense. The memory locations pointed to by |
| * @d_max_p and @d_min_p are only modified on success. |
| */ |
| static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
| u32 target_state, int *d_min_p, int *d_max_p) |
| { |
| char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
| acpi_handle handle = adev->handle; |
| unsigned long long ret; |
| int d_min, d_max; |
| bool wakeup = false; |
| acpi_status status; |
| |
| /* |
| * If the system state is S0, the lowest power state the device can be |
| * in is D3cold, unless the device has _S0W and is supposed to signal |
| * wakeup, in which case the return value of _S0W has to be used as the |
| * lowest power state available to the device. |
| */ |
| d_min = ACPI_STATE_D0; |
| d_max = ACPI_STATE_D3_COLD; |
| |
| /* |
| * If present, _SxD methods return the minimum D-state (highest power |
| * state) we can use for the corresponding S-states. Otherwise, the |
| * minimum D-state is D0 (ACPI 3.x). |
| */ |
| if (target_state > ACPI_STATE_S0) { |
| /* |
| * We rely on acpi_evaluate_integer() not clobbering the integer |
| * provided if AE_NOT_FOUND is returned. |
| */ |
| ret = d_min; |
| status = acpi_evaluate_integer(handle, method, NULL, &ret); |
| if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
| || ret > ACPI_STATE_D3_COLD) |
| return -ENODATA; |
| |
| /* |
| * We need to handle legacy systems where D3hot and D3cold are |
| * the same and 3 is returned in both cases, so fall back to |
| * D3cold if D3hot is not a valid state. |
| */ |
| if (!adev->power.states[ret].flags.valid) { |
| if (ret == ACPI_STATE_D3_HOT) |
| ret = ACPI_STATE_D3_COLD; |
| else |
| return -ENODATA; |
| } |
| d_min = ret; |
| wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
| && adev->wakeup.sleep_state >= target_state; |
| } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != |
| PM_QOS_FLAGS_NONE) { |
| wakeup = adev->wakeup.flags.valid; |
| } |
| |
| /* |
| * If _PRW says we can wake up the system from the target sleep state, |
| * the D-state returned by _SxD is sufficient for that (we assume a |
| * wakeup-aware driver if wake is set). Still, if _SxW exists |
| * (ACPI 3.x), it should return the maximum (lowest power) D-state that |
| * can wake the system. _S0W may be valid, too. |
| */ |
| if (wakeup) { |
| method[3] = 'W'; |
| status = acpi_evaluate_integer(handle, method, NULL, &ret); |
| if (status == AE_NOT_FOUND) { |
| if (target_state > ACPI_STATE_S0) |
| d_max = d_min; |
| } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
| /* Fall back to D3cold if ret is not a valid state. */ |
| if (!adev->power.states[ret].flags.valid) |
| ret = ACPI_STATE_D3_COLD; |
| |
| d_max = ret > d_min ? ret : d_min; |
| } else { |
| return -ENODATA; |
| } |
| } |
| |
| if (d_min_p) |
| *d_min_p = d_min; |
| |
| if (d_max_p) |
| *d_max_p = d_max; |
| |
| return 0; |
| } |
| |
| /** |
| * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. |
| * @dev: Device whose preferred target power state to return. |
| * @d_min_p: Location to store the upper limit of the allowed states range. |
| * @d_max_in: Deepest low-power state to take into consideration. |
| * Return value: Preferred power state of the device on success, -ENODEV |
| * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
| * incorrect, or -ENODATA on ACPI method failure. |
| * |
| * The caller must ensure that @dev is valid before using this function. |
| */ |
| int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) |
| { |
| struct acpi_device *adev; |
| int ret, d_min, d_max; |
| |
| if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) |
| return -EINVAL; |
| |
| if (d_max_in > ACPI_STATE_D3_HOT) { |
| 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_D3_HOT; |
| } |
| |
| adev = ACPI_COMPANION(dev); |
| if (!adev) { |
| dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
| &d_min, &d_max); |
| if (ret) |
| return ret; |
| |
| if (d_max_in < d_min) |
| return -EINVAL; |
| |
| if (d_max > d_max_in) { |
| for (d_max = d_max_in; d_max > d_min; d_max--) { |
| if (adev->power.states[d_max].flags.valid) |
| break; |
| } |
| } |
| |
| if (d_min_p) |
| *d_min_p = d_min; |
| |
| return d_max; |
| } |
| EXPORT_SYMBOL(acpi_pm_device_sleep_state); |
| |
| /** |
| * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
| * @work: Work item to handle. |
| */ |
| static void acpi_pm_notify_work_func(struct work_struct *work) |
| { |
| struct device *dev; |
| |
| dev = container_of(work, struct acpi_device_wakeup_context, work)->dev; |
| if (dev) { |
| pm_wakeup_event(dev, 0); |
| pm_runtime_resume(dev); |
| } |
| } |
| |
| /** |
| * acpi_device_wakeup - Enable/disable wakeup functionality for device. |
| * @adev: ACPI device to enable/disable wakeup functionality for. |
| * @target_state: State the system is transitioning into. |
| * @enable: Whether to enable or disable the wakeup functionality. |
| * |
| * Enable/disable the GPE associated with @adev so that it can generate |
| * wakeup signals for the device in response to external (remote) events and |
| * enable/disable device wakeup power. |
| * |
| * Callers must ensure that @adev is a valid ACPI device node before executing |
| * this function. |
| */ |
| static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state, |
| bool enable) |
| { |
| struct acpi_device_wakeup *wakeup = &adev->wakeup; |
| |
| if (enable) { |
| acpi_status res; |
| int error; |
| |
| error = acpi_enable_wakeup_device_power(adev, target_state); |
| if (error) |
| return error; |
| |
| if (adev->wakeup.flags.enabled) |
| return 0; |
| |
| res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
| if (ACPI_SUCCESS(res)) { |
| adev->wakeup.flags.enabled = 1; |
| } else { |
| acpi_disable_wakeup_device_power(adev); |
| return -EIO; |
| } |
| } else { |
| if (adev->wakeup.flags.enabled) { |
| acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
| adev->wakeup.flags.enabled = 0; |
| } |
| acpi_disable_wakeup_device_power(adev); |
| } |
| return 0; |
| } |
| |
| /** |
| * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. |
| * @dev: Device to enable/disable the platform to wake up. |
| * @enable: Whether to enable or disable the wakeup functionality. |
| */ |
| int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) |
| { |
| struct acpi_device *adev; |
| |
| if (!device_run_wake(phys_dev)) |
| return -EINVAL; |
| |
| adev = ACPI_COMPANION(phys_dev); |
| if (!adev) { |
| dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| return acpi_device_wakeup(adev, ACPI_STATE_S0, enable); |
| } |
| EXPORT_SYMBOL(acpi_pm_device_run_wake); |
| |
| #ifdef CONFIG_PM_SLEEP |
| /** |
| * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. |
| * @dev: Device to enable/desible to wake up the system from sleep states. |
| * @enable: Whether to enable or disable @dev to wake up the system. |
| */ |
| int acpi_pm_device_sleep_wake(struct device *dev, bool enable) |
| { |
| struct acpi_device *adev; |
| int error; |
| |
| if (!device_can_wakeup(dev)) |
| return -EINVAL; |
| |
| adev = ACPI_COMPANION(dev); |
| if (!adev) { |
| dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| error = acpi_device_wakeup(adev, acpi_target_system_state(), enable); |
| if (!error) |
| dev_info(dev, "System wakeup %s by ACPI\n", |
| enable ? "enabled" : "disabled"); |
| |
| return error; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| /** |
| * acpi_dev_pm_low_power - Put ACPI device into a low-power state. |
| * @dev: Device to put into a low-power state. |
| * @adev: ACPI device node corresponding to @dev. |
| * @system_state: System state to choose the device state for. |
| */ |
| static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, |
| u32 system_state) |
| { |
| int ret, state; |
| |
| if (!acpi_device_power_manageable(adev)) |
| return 0; |
| |
| ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
| return ret ? ret : acpi_device_set_power(adev, state); |
| } |
| |
| /** |
| * acpi_dev_pm_full_power - Put ACPI device into the full-power state. |
| * @adev: ACPI device node to put into the full-power state. |
| */ |
| static int acpi_dev_pm_full_power(struct acpi_device *adev) |
| { |
| return acpi_device_power_manageable(adev) ? |
| acpi_device_set_power(adev, ACPI_STATE_D0) : 0; |
| } |
| |
| /** |
| * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. |
| * @dev: Device to put into a low-power state. |
| * |
| * Put the given device into a runtime low-power state using the standard ACPI |
| * mechanism. Set up remote wakeup if desired, choose the state to put the |
| * device into (this checks if remote wakeup is expected to work too), and set |
| * the power state of the device. |
| */ |
| int acpi_dev_runtime_suspend(struct device *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| bool remote_wakeup; |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > |
| PM_QOS_FLAGS_NONE; |
| error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup); |
| if (remote_wakeup && error) |
| return -EAGAIN; |
| |
| error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
| if (error) |
| acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
| |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); |
| |
| /** |
| * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. |
| * @dev: Device to put into the full-power state. |
| * |
| * Put the given device into the full-power state using the standard ACPI |
| * mechanism at run time. Set the power state of the device to ACPI D0 and |
| * disable remote wakeup. |
| */ |
| int acpi_dev_runtime_resume(struct device *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| error = acpi_dev_pm_full_power(adev); |
| acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); |
| |
| /** |
| * acpi_subsys_runtime_suspend - Suspend device using ACPI. |
| * @dev: Device to suspend. |
| * |
| * Carry out the generic runtime suspend procedure for @dev and use ACPI to put |
| * it into a runtime low-power state. |
| */ |
| int acpi_subsys_runtime_suspend(struct device *dev) |
| { |
| int ret = pm_generic_runtime_suspend(dev); |
| return ret ? ret : acpi_dev_runtime_suspend(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); |
| |
| /** |
| * acpi_subsys_runtime_resume - Resume device using ACPI. |
| * @dev: Device to Resume. |
| * |
| * Use ACPI to put the given device into the full-power state and carry out the |
| * generic runtime resume procedure for it. |
| */ |
| int acpi_subsys_runtime_resume(struct device *dev) |
| { |
| int ret = acpi_dev_runtime_resume(dev); |
| return ret ? ret : pm_generic_runtime_resume(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); |
| |
| #ifdef CONFIG_PM_SLEEP |
| /** |
| * acpi_dev_suspend_late - Put device into a low-power state using ACPI. |
| * @dev: Device to put into a low-power state. |
| * |
| * Put the given device into a low-power state during system transition to a |
| * sleep state using the standard ACPI mechanism. Set up system wakeup if |
| * desired, choose the state to put the device into (this checks if system |
| * wakeup is expected to work too), and set the power state of the device. |
| */ |
| int acpi_dev_suspend_late(struct device *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| u32 target_state; |
| bool wakeup; |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| target_state = acpi_target_system_state(); |
| wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev); |
| error = acpi_device_wakeup(adev, target_state, wakeup); |
| if (wakeup && error) |
| return error; |
| |
| error = acpi_dev_pm_low_power(dev, adev, target_state); |
| if (error) |
| acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
| |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); |
| |
| /** |
| * acpi_dev_resume_early - Put device into the full-power state using ACPI. |
| * @dev: Device to put into the full-power state. |
| * |
| * Put the given device into the full-power state using the standard ACPI |
| * mechanism during system transition to the working state. Set the power |
| * state of the device to ACPI D0 and disable remote wakeup. |
| */ |
| int acpi_dev_resume_early(struct device *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| error = acpi_dev_pm_full_power(adev); |
| acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_resume_early); |
| |
| /** |
| * acpi_subsys_prepare - Prepare device for system transition to a sleep state. |
| * @dev: Device to prepare. |
| */ |
| int acpi_subsys_prepare(struct device *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| u32 sys_target; |
| int ret, state; |
| |
| ret = pm_generic_prepare(dev); |
| if (ret < 0) |
| return ret; |
| |
| if (!adev || !pm_runtime_suspended(dev) |
| || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) |
| return 0; |
| |
| sys_target = acpi_target_system_state(); |
| if (sys_target == ACPI_STATE_S0) |
| return 1; |
| |
| if (adev->power.flags.dsw_present) |
| return 0; |
| |
| ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); |
| return !ret && state == adev->power.state; |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_prepare); |
| |
| /** |
| * acpi_subsys_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 (dev->power.direct_complete) |
| 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 suspended at run time before running their |
| * system suspend callbacks. |
| */ |
| int acpi_subsys_suspend(struct device *dev) |
| { |
| pm_runtime_resume(dev); |
| return pm_generic_suspend(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
| |
| /** |
| * acpi_subsys_suspend_late - Suspend device using ACPI. |
| * @dev: Device to suspend. |
| * |
| * Carry out the generic late suspend procedure for @dev and use ACPI to put |
| * it into a low-power state during system transition into a sleep state. |
| */ |
| int acpi_subsys_suspend_late(struct device *dev) |
| { |
| int ret = pm_generic_suspend_late(dev); |
| return ret ? ret : acpi_dev_suspend_late(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); |
| |
| /** |
| * acpi_subsys_resume_early - Resume device using ACPI. |
| * @dev: Device to Resume. |
| * |
| * Use ACPI to put the given device into the full-power state and carry out the |
| * generic early resume procedure for it during system transition into the |
| * working state. |
| */ |
| int acpi_subsys_resume_early(struct device *dev) |
| { |
| int ret = acpi_dev_resume_early(dev); |
| return ret ? ret : pm_generic_resume_early(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); |
| |
| /** |
| * acpi_subsys_freeze - Run the device driver's freeze callback. |
| * @dev: Device to handle. |
| */ |
| int acpi_subsys_freeze(struct device *dev) |
| { |
| /* |
| * This used to be done in acpi_subsys_prepare() for all devices and |
| * some drivers may depend on it, so do it here. Ideally, however, |
| * runtime-suspended devices should not be touched during freeze/thaw |
| * transitions. |
| */ |
| pm_runtime_resume(dev); |
| return pm_generic_freeze(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
| |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static struct dev_pm_domain acpi_general_pm_domain = { |
| .ops = { |
| .runtime_suspend = acpi_subsys_runtime_suspend, |
| .runtime_resume = acpi_subsys_runtime_resume, |
| #ifdef CONFIG_PM_SLEEP |
| .prepare = acpi_subsys_prepare, |
| .complete = acpi_subsys_complete, |
| .suspend = acpi_subsys_suspend, |
| .suspend_late = acpi_subsys_suspend_late, |
| .resume_early = acpi_subsys_resume_early, |
| .freeze = acpi_subsys_freeze, |
| .poweroff = acpi_subsys_suspend, |
| .poweroff_late = acpi_subsys_suspend_late, |
| .restore_early = acpi_subsys_resume_early, |
| #endif |
| }, |
| }; |
| |
| /** |
| * acpi_dev_pm_detach - Remove ACPI power management from the device. |
| * @dev: Device to take care of. |
| * @power_off: Whether or not to try to remove power from the device. |
| * |
| * Remove the device from the general ACPI PM domain and remove its wakeup |
| * notifier. If @power_off is set, additionally remove power from the device if |
| * possible. |
| * |
| * Callers must ensure proper synchronization of this function with power |
| * management callbacks. |
| */ |
| static void acpi_dev_pm_detach(struct device *dev, bool power_off) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| |
| if (adev && dev->pm_domain == &acpi_general_pm_domain) { |
| dev->pm_domain = NULL; |
| acpi_remove_pm_notifier(adev); |
| if (power_off) { |
| /* |
| * If the device's PM QoS resume latency limit or flags |
| * have been exposed to user space, they have to be |
| * hidden at this point, so that they don't affect the |
| * choice of the low-power state to put the device into. |
| */ |
| dev_pm_qos_hide_latency_limit(dev); |
| dev_pm_qos_hide_flags(dev); |
| acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
| acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
| } |
| } |
| } |
| |
| /** |
| * acpi_dev_pm_attach - Prepare device for ACPI power management. |
| * @dev: Device to prepare. |
| * @power_on: Whether or not to power on the device. |
| * |
| * If @dev has a valid ACPI handle that has a valid struct acpi_device object |
| * attached to it, install a wakeup notification handler for the device and |
| * add it to the general ACPI PM domain. If @power_on is set, the device will |
| * be put into the ACPI D0 state before the function returns. |
| * |
| * This assumes that the @dev's bus type uses generic power management callbacks |
| * (or doesn't use any power management callbacks at all). |
| * |
| * Callers must ensure proper synchronization of this function with power |
| * management callbacks. |
| */ |
| int acpi_dev_pm_attach(struct device *dev, bool power_on) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(dev); |
| |
| if (!adev) |
| return -ENODEV; |
| |
| if (dev->pm_domain) |
| return -EEXIST; |
| |
| acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
| dev->pm_domain = &acpi_general_pm_domain; |
| if (power_on) { |
| acpi_dev_pm_full_power(adev); |
| acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
| } |
| |
| dev->pm_domain->detach = acpi_dev_pm_detach; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); |
| #endif /* CONFIG_PM */ |