From dee8370cc87e505ef39567f0974e73d59e75d76b Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 2 Nov 2012 01:40:36 +0100 Subject: ACPI / PM: Split device wakeup management routines Two device wakeup management routines in device_pm.c and sleep.c, acpi_pm_device_run_wake() and acpi_pm_device_sleep_wake(), take a device pointer argument and use it to obtain the ACPI handle of the corresponding ACPI namespace node. That handle is then used to get the address of the struct acpi_device object corresponding to the struct device passed as the argument. Unfortunately, that last operation may be costly, because it involves taking the global ACPI namespace mutex, so it shouldn't be carried out too often. However, the callers of those routines usually call them in a row with acpi_pm_device_sleep_state() which also takes that mutex for the same reason, so it would be more efficient if they ran acpi_bus_get_device() themselves to obtain a pointer to the struct acpi_device object in question and then passed that pointer to the appropriate PM routines. To make that possible, split each of the PM routines mentioned above in two parts, one taking a struct acpi_device pointer argument and the other implementing the current interface for compatibility. Additionally, change acpi_pm_device_run_wake() to actually return an error code if there is an error while setting up runtime remote wakeup for the device. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_pm.c | 74 +++++++++++++++++++++++++++++++++++++----------- 1 file changed, 57 insertions(+), 17 deletions(-) (limited to 'drivers/acpi/device_pm.c') diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 81052981045e..b4f03f91b0b0 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -200,38 +200,78 @@ EXPORT_SYMBOL_GPL(acpi_device_power_state); #ifdef CONFIG_PM_RUNTIME /** - * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. - * @phys_dev: Device to enable/disable the platform to wake up. + * __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. * - * Find the ACPI device object corresponding to @phys_dev and try to - * enable/disable the GPE associated with it, so that it can generate - * wakeup signals for the device in response to external (remote) events. + * 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 *dev; + struct acpi_device *adev; acpi_handle handle; if (!device_run_wake(phys_dev)) return -EINVAL; handle = DEVICE_ACPI_HANDLE(phys_dev); - if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) { - dev_dbg(phys_dev, "ACPI handle has no context in %s!\n", + if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { + dev_dbg(phys_dev, "ACPI handle without context in %s!\n", __func__); return -ENODEV; } - if (enable) { - acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0); - acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number); - } else { - acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number); - acpi_disable_wakeup_device_power(dev); - } - - return 0; + return __acpi_device_run_wake(adev, enable); } EXPORT_SYMBOL(acpi_pm_device_run_wake); #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); +} +#endif /* CONFIG_PM_SLEEP */ -- cgit v1.2.1