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ACPI / PM: More visible function for retrieving device power states

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The function used for retrieving ACPI device power states,
__acpi_bus_get_power(), is now static, because it is only used
internally in drivers/acpi/bus.c.  However, it will be used
outside of that file going forward, so rename it to
acpi_device_get_power(), in analogy with acpi_device_set_power(),
add a kerneldoc comment to it and add its header to acpi_bus.h.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-01-17 14:11:08 +01:00
parent ff0c41942f
commit ad0c3b0e48
2 changed files with 13 additions and 3 deletions
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15
drivers/acpi/bus.c
View File

@ -200,7 +200,16 @@ static const char *state_string(int state)
}
}
static int __acpi_bus_get_power(struct acpi_device *device, int *state)
/**
* 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;
@ -397,7 +406,7 @@ int acpi_bus_init_power(struct acpi_device *device)
device->power.state = ACPI_STATE_UNKNOWN;
result = __acpi_bus_get_power(device, &state);
result = acpi_device_get_power(device, &state);
if (result)
return result;
@ -421,7 +430,7 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p)
if (result)
return result;
result = __acpi_bus_get_power(device, &state);
result = acpi_device_get_power(device, &state);
if (result)
return result;

1
include/acpi/acpi_bus.h
View File

@ -331,6 +331,7 @@ 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_get_power(struct acpi_device *device, 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);