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ACPI / PM: Provide device PM functions operating on struct acpi_device 

If the caller of acpi_bus_set_power() already has a pointer to the
struct acpi_device object corresponding to the device in question, it
doesn't make sense for it to go through acpi_bus_get_device(), which
may be costly, because it involves acquiring the global ACPI
namespace mutex.

For this reason, export the function operating on struct acpi_device
objects used internally by acpi_bus_set_power(), so that it may be
called instead of acpi_bus_set_power() in the above case, and change
its name to acpi_device_set_power().

Additionally, introduce two inline wrappers for checking ACPI PM
capabilities of devices represented by struct acpi_device objects.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Rafael J. Wysocki 2012-11-02 01:40:45 +01:00
parent dee8370cc8
commit 078eb12648
2 changed files with 23 additions and 3 deletions
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15
drivers/acpi/bus.c
View File

@ -257,7 +257,15 @@ static int __acpi_bus_get_power(struct acpi_device *device, int *state)
}
static int __acpi_bus_set_power(struct acpi_device *device, int state)
/**
* 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;
acpi_status status = AE_OK;
@ -341,6 +349,7 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
return result;
}
EXPORT_SYMBOL(acpi_device_set_power);
int acpi_bus_set_power(acpi_handle handle, int state)
@ -359,7 +368,7 @@ int acpi_bus_set_power(acpi_handle handle, int state)
return -ENODEV;
}
return __acpi_bus_set_power(device, state);
return acpi_device_set_power(device, state);
}
EXPORT_SYMBOL(acpi_bus_set_power);
@ -402,7 +411,7 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p)
if (result)
return result;
result = __acpi_bus_set_power(device, state);
result = acpi_device_set_power(device, state);
if (!result && state_p)
*state_p = state;

11
include/acpi/acpi_bus.h
View File

@ -339,6 +339,7 @@ acpi_status acpi_bus_get_status_handle(acpi_handle handle,
unsigned long long *sta);
int acpi_bus_get_status(struct acpi_device *device);
int acpi_bus_set_power(acpi_handle handle, int state);
int acpi_device_set_power(struct acpi_device *device, int state);
int acpi_bus_update_power(acpi_handle handle, int *state_p);
bool acpi_bus_power_manageable(acpi_handle handle);
bool acpi_bus_can_wakeup(acpi_handle handle);
@ -483,6 +484,16 @@ static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
}
#endif
static inline bool acpi_device_power_manageable(struct acpi_device *adev)
{
return adev->flags.power_manageable;
}
static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
{
return adev->wakeup.flags.valid;
}
#else /* CONFIG_ACPI */
static inline int register_acpi_bus_type(void *bus) { return 0; }