Commit b82a7df4 authored by Sakari Ailus's avatar Sakari Ailus Committed by Rafael J. Wysocki

ACPI: Add a convenience function to tell a device is in D0 state

Add a convenience function to tell whether a device is in D0 state,
primarily for use in drivers' probe or remove functions on busses where
the custom is to power on the device for the duration of both.

Returns false on non-ACPI systems.
Suggested-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: default avatarTomasz Figa <tfiga@chromium.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ed66f12b
......@@ -1400,4 +1400,30 @@ bool acpi_storage_d3(struct device *dev)
}
EXPORT_SYMBOL_GPL(acpi_storage_d3);
/**
* acpi_dev_state_d0 - Tell if the device is in D0 power state
* @dev: Physical device the ACPI power state of which to check
*
* On a system without ACPI, return true. On a system with ACPI, return true if
* the current ACPI power state of the device is D0, or false otherwise.
*
* Note that the power state of a device is not well-defined after it has been
* passed to acpi_device_set_power() and before that function returns, so it is
* not valid to ask for the ACPI power state of the device in that time frame.
*
* This function is intended to be used in a driver's probe or remove
* function. See Documentation/firmware-guide/acpi/low-power-probe.rst for
* more information.
*/
bool acpi_dev_state_d0(struct device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
if (!adev)
return true;
return adev->power.state == ACPI_STATE_D0;
}
EXPORT_SYMBOL_GPL(acpi_dev_state_d0);
#endif /* CONFIG_PM */
......@@ -1016,6 +1016,7 @@ int acpi_subsys_runtime_suspend(struct device *dev);
int acpi_subsys_runtime_resume(struct device *dev);
int acpi_dev_pm_attach(struct device *dev, bool power_on);
bool acpi_storage_d3(struct device *dev);
bool acpi_dev_state_d0(struct device *dev);
#else
static inline int acpi_subsys_runtime_suspend(struct device *dev) { return 0; }
static inline int acpi_subsys_runtime_resume(struct device *dev) { return 0; }
......@@ -1027,6 +1028,10 @@ static inline bool acpi_storage_d3(struct device *dev)
{
return false;
}
static inline bool acpi_dev_state_d0(struct device *dev)
{
return true;
}
#endif
#if defined(CONFIG_ACPI) && defined(CONFIG_PM_SLEEP)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment