diff options
| -rw-r--r-- | drivers/acpi/device_pm.c | 317 | ||||
| -rw-r--r-- | include/linux/acpi.h | 34 |
2 files changed, 351 insertions, 0 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 7ddd93463a2e..a8e059f69d50 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -225,6 +225,22 @@ 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. @@ -283,6 +299,9 @@ int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) 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 @@ -329,3 +348,301 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 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. + */ +static 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_SUCCESS(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. + * + * 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. + * + * 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) +{ + 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; + 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. + * + * Remove the device from the general ACPI PM domain and remove its wakeup + * notifier. + * + * Callers must ensure proper synchronization of this function with power + * management callbacks. + */ +void acpi_dev_pm_detach(struct device *dev) +{ + 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); + } +} +EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 90be98981102..0676b6ac57fa 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -430,4 +430,38 @@ acpi_status acpi_os_prepare_sleep(u8 sleep_state, #define acpi_os_set_prepare_sleep(func, pm1a_ctrl, pm1b_ctrl) do { } while (0) #endif +#if defined(CONFIG_ACPI) && defined(CONFIG_PM_RUNTIME) +int acpi_dev_runtime_suspend(struct device *dev); +int acpi_dev_runtime_resume(struct device *dev); +int acpi_subsys_runtime_suspend(struct device *dev); +int acpi_subsys_runtime_resume(struct device *dev); +#else +static inline int acpi_dev_runtime_suspend(struct device *dev) { return 0; } +static inline int acpi_dev_runtime_resume(struct device *dev) { return 0; } +static inline int acpi_subsys_runtime_suspend(struct device *dev) { return 0; } +static inline int acpi_subsys_runtime_resume(struct device *dev) { return 0; } +#endif + +#ifdef CONFIG_ACPI_SLEEP +int acpi_dev_suspend_late(struct device *dev); +int acpi_dev_resume_early(struct device *dev); +int acpi_subsys_prepare(struct device *dev); +int acpi_subsys_suspend_late(struct device *dev); +int acpi_subsys_resume_early(struct device *dev); +#else +static inline int acpi_dev_suspend_late(struct device *dev) { return 0; } +static inline int acpi_dev_resume_early(struct device *dev) { return 0; } +static inline int acpi_subsys_prepare(struct device *dev) { return 0; } +static inline int acpi_subsys_suspend_late(struct device *dev) { return 0; } +static inline int acpi_subsys_resume_early(struct device *dev) { return 0; } +#endif + +#if defined(CONFIG_ACPI) && defined(CONFIG_PM) +int acpi_dev_pm_attach(struct device *dev); +int acpi_dev_pm_detach(struct device *dev); +#else +static inline int acpi_dev_pm_attach(struct device *dev) { return -ENODEV; } +static inline void acpi_dev_pm_detach(struct device *dev) {} +#endif + #endif /*_LINUX_ACPI_H*/ |