diff options
author | Rafael J. Wysocki <rjw@sisk.pl> | 2010-11-25 00:08:36 +0100 |
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committer | Len Brown <len.brown@intel.com> | 2011-01-12 10:48:44 +0100 |
commit | ade3e7fef794781c0798d0cf0f046123842ba550 (patch) | |
tree | da022d17787e9b79012fae0fabf6e7bf612b3edd /drivers/acpi/bus.c | |
parent | ACPI / PM: Introduce __acpi_bus_get_power() (diff) | |
download | linux-ade3e7fef794781c0798d0cf0f046123842ba550.tar.xz linux-ade3e7fef794781c0798d0cf0f046123842ba550.zip |
ACPI / PM: Add function for device power state initialization
Add function acpi_bus_init_power() for getting the initial power
state of an ACPI device and reference counting its power resources
as appropriate.
Make acpi_bus_get_power_flags() use the new function instead of
acpi_bus_get_power() that updates device->power.state without
reference counting the device's power resources.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/bus.c')
-rw-r--r-- | drivers/acpi/bus.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 9657abc4a7fb..453451090502 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -364,6 +364,31 @@ int acpi_bus_set_power(acpi_handle handle, int state) EXPORT_SYMBOL(acpi_bus_set_power); + +int acpi_bus_init_power(struct acpi_device *device) +{ + int state; + int result; + + if (!device) + return -EINVAL; + + device->power.state = ACPI_STATE_UNKNOWN; + + result = __acpi_bus_get_power(device, &state); + if (result) + return result; + + if (device->power.flags.power_resources) + result = acpi_power_on_resources(device, state); + + if (!result) + device->power.state = state; + + return result; +} + + bool acpi_bus_power_manageable(acpi_handle handle) { struct acpi_device *device; |