| /* |
| * 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/device.h> |
| #include <linux/export.h> |
| #include <linux/mutex.h> |
| #include <linux/pm_qos.h> |
| #include <linux/pm_runtime.h> |
| |
| #include <acpi/acpi.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.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. |
| */ |
| if (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 || (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 is already at %s\n", |
| acpi_power_state_string(state))); |
| return 0; |
| } |
| |
| if (!device->power.states[state].flags.valid) { |
| printk(KERN_WARNING PREFIX "Device does not support %s\n", |
| acpi_power_state_string(state)); |
| return -ENODEV; |
| } |
| if (device->parent && (state < device->parent->power.state)) { |
| printk(KERN_WARNING PREFIX |
| "Cannot set device to a higher-powered" |
| " state than parent\n"); |
| 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) { |
| printk(KERN_WARNING PREFIX |
| "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 evalute _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) { |
| printk(KERN_WARNING PREFIX |
| "Device [%s] failed to transition to %s\n", |
| device->pnp.bus_id, |
| 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; |
| |
| if (!device->flags.power_manageable) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "Device [%s] is not power manageable\n", |
| dev_name(&device->dev))); |
| return -ENODEV; |
| } |
| |
| 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; |
| |
| 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_bus_update_power(acpi_handle handle, int *state_p) |
| { |
| struct acpi_device *device; |
| int state; |
| int result; |
| |
| result = acpi_bus_get_device(handle, &device); |
| if (result) |
| 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_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); |
| |
| /** |
| * acpi_add_pm_notifier - Register PM notifier for given ACPI device. |
| * @adev: ACPI device to add the notifier for. |
| * @context: Context information to pass to the notifier routine. |
| * |
| * 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, |
| acpi_notify_handler handler, void *context) |
| { |
| acpi_status status = AE_ALREADY_EXISTS; |
| |
| mutex_lock(&acpi_pm_notifier_lock); |
| |
| if (adev->wakeup.flags.notifier_present) |
| goto out; |
| |
| status = acpi_install_notify_handler(adev->handle, |
| ACPI_SYSTEM_NOTIFY, |
| handler, context); |
| 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_notify_handler handler) |
| { |
| 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, |
| handler); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| |
| 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_device_power_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_max_in: Deepest low-power state to take into consideration. |
| * @d_min_p: Location to store the upper limit of the allowed states range. |
| * Return value: Preferred power state of the device on success, -ENODEV |
| * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure |
| * |
| * Find the lowest power (highest number) ACPI device power state that the |
| * device can be in while the system is in the state represented by |
| * @target_state. If @d_min_p is set, the highest power (lowest number) device |
| * power state that @dev can be in for the given system sleep state is stored |
| * at the location pointed to by it. |
| * |
| * Callers must ensure that @dev and @adev are valid pointers and that @adev |
| * actually corresponds to @dev before using this function. |
| */ |
| int acpi_device_power_state(struct device *dev, struct acpi_device *adev, |
| u32 target_state, int d_max_in, int *d_min_p) |
| { |
| char acpi_method[] = "_SxD"; |
| unsigned long long d_min, d_max; |
| bool wakeup = false; |
| |
| if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3) |
| 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; |
| } |
| |
| acpi_method[2] = '0' + target_state; |
| /* |
| * If the sleep state is S0, the lowest limit from ACPI is D3, |
| * but if the device has _S0W, we will use the value from _S0W |
| * as the lowest limit from ACPI. Finally, we will constrain |
| * the lowest limit with the specified one. |
| */ |
| d_min = ACPI_STATE_D0; |
| d_max = ACPI_STATE_D3; |
| |
| /* |
| * 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). |
| * |
| * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer |
| * provided -- that's our fault recovery, we ignore retval. |
| */ |
| if (target_state > ACPI_STATE_S0) { |
| acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min); |
| 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) { |
| acpi_status status; |
| |
| acpi_method[3] = 'W'; |
| status = acpi_evaluate_integer(adev->handle, acpi_method, NULL, |
| &d_max); |
| if (ACPI_FAILURE(status)) { |
| if (target_state != ACPI_STATE_S0 || |
| status != AE_NOT_FOUND) |
| d_max = d_min; |
| } else if (d_max < d_min) { |
| /* Warn the user of the broken DSDT */ |
| printk(KERN_WARNING "ACPI: Wrong value from %s\n", |
| acpi_method); |
| /* Sanitize it */ |
| d_min = d_max; |
| } |
| } |
| |
| if (d_max_in < d_min) |
| return -EINVAL; |
| if (d_min_p) |
| *d_min_p = d_min; |
| /* constrain d_max with specified lowest limit (max number) */ |
| 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; |
| } |
| } |
| return d_max; |
| } |
| EXPORT_SYMBOL_GPL(acpi_device_power_state); |
| |
| /** |
| * 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) or -EINVAL on 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) |
| { |
| acpi_handle handle = DEVICE_ACPI_HANDLE(dev); |
| struct acpi_device *adev; |
| |
| if (!handle || acpi_bus_get_device(handle, &adev)) { |
| dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| return acpi_device_power_state(dev, adev, acpi_target_system_state(), |
| d_max_in, d_min_p); |
| } |
| EXPORT_SYMBOL(acpi_pm_device_sleep_state); |
| |
| #ifdef CONFIG_PM_RUNTIME |
| /** |
| * acpi_wakeup_device - Wakeup notification handler for ACPI devices. |
| * @handle: ACPI handle of the device the notification is for. |
| * @event: Type of the signaled event. |
| * @context: Device corresponding to @handle. |
| */ |
| static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context) |
| { |
| struct device *dev = context; |
| |
| if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) { |
| pm_wakeup_event(dev, 0); |
| pm_runtime_resume(dev); |
| } |
| } |
| |
| /** |
| * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device. |
| * @adev: ACPI device to enable/disable the remote wakeup for. |
| * @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. |
| */ |
| int __acpi_device_run_wake(struct acpi_device *adev, bool enable) |
| { |
| struct acpi_device_wakeup *wakeup = &adev->wakeup; |
| |
| if (enable) { |
| acpi_status res; |
| int error; |
| |
| error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0); |
| if (error) |
| return error; |
| |
| res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
| if (ACPI_FAILURE(res)) { |
| acpi_disable_wakeup_device_power(adev); |
| return -EIO; |
| } |
| } else { |
| acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
| 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; |
| acpi_handle handle; |
| |
| if (!device_run_wake(phys_dev)) |
| return -EINVAL; |
| |
| handle = DEVICE_ACPI_HANDLE(phys_dev); |
| if (!handle || acpi_bus_get_device(handle, &adev)) { |
| dev_dbg(phys_dev, "ACPI handle without context in %s!\n", |
| __func__); |
| return -ENODEV; |
| } |
| |
| return __acpi_device_run_wake(adev, enable); |
| } |
| EXPORT_SYMBOL(acpi_pm_device_run_wake); |
| #else |
| static inline void acpi_wakeup_device(acpi_handle handle, u32 event, |
| void *context) {} |
| #endif /* CONFIG_PM_RUNTIME */ |
| |
| #ifdef CONFIG_PM_SLEEP |
| /** |
| * __acpi_device_sleep_wake - Enable or disable device to wake up the system. |
| * @dev: Device to enable/desible to wake up the system. |
| * @target_state: System state the device is supposed to wake up from. |
| * @enable: Whether to enable or disable @dev to wake up the system. |
| */ |
| int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state, |
| bool enable) |
| { |
| return enable ? |
| acpi_enable_wakeup_device_power(adev, target_state) : |
| acpi_disable_wakeup_device_power(adev); |
| } |
| |
| /** |
| * 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) |
| { |
| acpi_handle handle; |
| struct acpi_device *adev; |
| int error; |
| |
| if (!device_can_wakeup(dev)) |
| return -EINVAL; |
| |
| handle = DEVICE_ACPI_HANDLE(dev); |
| if (!handle || acpi_bus_get_device(handle, &adev)) { |
| dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| error = __acpi_device_sleep_wake(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_get_node - Get ACPI device node for the given physical device. |
| * @dev: Device to get the ACPI node for. |
| */ |
| struct acpi_device *acpi_dev_pm_get_node(struct device *dev) |
| { |
| acpi_handle handle = DEVICE_ACPI_HANDLE(dev); |
| struct acpi_device *adev; |
| |
| return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL; |
| } |
| |
| /** |
| * 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 power_state; |
| |
| if (!acpi_device_power_manageable(adev)) |
| return 0; |
| |
| power_state = acpi_device_power_state(dev, adev, system_state, |
| ACPI_STATE_D3, NULL); |
| if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3) |
| return -EIO; |
| |
| return acpi_device_set_power(adev, power_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; |
| } |
| |
| #ifdef CONFIG_PM_RUNTIME |
| /** |
| * 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_dev_pm_get_node(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_run_wake(adev, remote_wakeup); |
| if (remote_wakeup && error) |
| return -EAGAIN; |
| |
| error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
| if (error) |
| __acpi_device_run_wake(adev, 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_dev_pm_get_node(dev); |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| error = acpi_dev_pm_full_power(adev); |
| __acpi_device_run_wake(adev, 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); |
| #endif /* CONFIG_PM_RUNTIME */ |
| |
| #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_dev_pm_get_node(dev); |
| u32 target_state; |
| bool wakeup; |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| target_state = acpi_target_system_state(); |
| wakeup = device_may_wakeup(dev); |
| error = __acpi_device_sleep_wake(adev, target_state, wakeup); |
| if (wakeup && error) |
| return error; |
| |
| error = acpi_dev_pm_low_power(dev, adev, target_state); |
| if (error) |
| __acpi_device_sleep_wake(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_dev_pm_get_node(dev); |
| int error; |
| |
| if (!adev) |
| return 0; |
| |
| error = acpi_dev_pm_full_power(adev); |
| __acpi_device_sleep_wake(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) |
| { |
| /* |
| * Follow PCI and resume devices suspended at run time before running |
| * their system suspend callbacks. |
| */ |
| pm_runtime_resume(dev); |
| return pm_generic_prepare(dev); |
| } |
| EXPORT_SYMBOL_GPL(acpi_subsys_prepare); |
| |
| /** |
| * 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); |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static struct dev_pm_domain acpi_general_pm_domain = { |
| .ops = { |
| #ifdef CONFIG_PM_RUNTIME |
| .runtime_suspend = acpi_subsys_runtime_suspend, |
| .runtime_resume = acpi_subsys_runtime_resume, |
| .runtime_idle = pm_generic_runtime_idle, |
| #endif |
| #ifdef CONFIG_PM_SLEEP |
| .prepare = acpi_subsys_prepare, |
| .suspend_late = acpi_subsys_suspend_late, |
| .resume_early = acpi_subsys_resume_early, |
| .poweroff_late = acpi_subsys_suspend_late, |
| .restore_early = acpi_subsys_resume_early, |
| #endif |
| }, |
| }; |
| |
| /** |
| * 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_dev_pm_get_node(dev); |
| |
| if (!adev) |
| return -ENODEV; |
| |
| if (dev->pm_domain) |
| return -EEXIST; |
| |
| acpi_add_pm_notifier(adev, acpi_wakeup_device, dev); |
| dev->pm_domain = &acpi_general_pm_domain; |
| if (power_on) { |
| acpi_dev_pm_full_power(adev); |
| __acpi_device_run_wake(adev, false); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); |
| |
| /** |
| * 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. |
| */ |
| void acpi_dev_pm_detach(struct device *dev, bool power_off) |
| { |
| struct acpi_device *adev = acpi_dev_pm_get_node(dev); |
| |
| if (adev && dev->pm_domain == &acpi_general_pm_domain) { |
| dev->pm_domain = NULL; |
| acpi_remove_pm_notifier(adev, acpi_wakeup_device); |
| 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_run_wake(adev, false); |
| acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
| } |
| } |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); |
| |
| /** |
| * acpi_dev_pm_add_dependent - Add physical device depending for PM. |
| * @handle: Handle of ACPI device node. |
| * @depdev: Device depending on that node for PM. |
| */ |
| void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev) |
| { |
| struct acpi_device_physical_node *dep; |
| struct acpi_device *adev; |
| |
| if (!depdev || acpi_bus_get_device(handle, &adev)) |
| return; |
| |
| mutex_lock(&adev->physical_node_lock); |
| |
| list_for_each_entry(dep, &adev->power_dependent, node) |
| if (dep->dev == depdev) |
| goto out; |
| |
| dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
| if (dep) { |
| dep->dev = depdev; |
| list_add_tail(&dep->node, &adev->power_dependent); |
| } |
| |
| out: |
| mutex_unlock(&adev->physical_node_lock); |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent); |
| |
| /** |
| * acpi_dev_pm_remove_dependent - Remove physical device depending for PM. |
| * @handle: Handle of ACPI device node. |
| * @depdev: Device depending on that node for PM. |
| */ |
| void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev) |
| { |
| struct acpi_device_physical_node *dep; |
| struct acpi_device *adev; |
| |
| if (!depdev || acpi_bus_get_device(handle, &adev)) |
| return; |
| |
| mutex_lock(&adev->physical_node_lock); |
| |
| list_for_each_entry(dep, &adev->power_dependent, node) |
| if (dep->dev == depdev) { |
| list_del(&dep->node); |
| kfree(dep); |
| break; |
| } |
| |
| mutex_unlock(&adev->physical_node_lock); |
| } |
| EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent); |
| #endif /* CONFIG_PM */ |