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author | Aaron Lu <aaron.lu@intel.com> | 2012-11-21 23:33:40 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2012-11-21 23:33:40 +0100 |
commit | 1399dfcdfe89898ccd791216f9679ba734aea910 (patch) | |
tree | 294a90abd00a3a293ea80419782aa690c788102c /include/acpi/acpi_bus.h | |
parent | ddc150f7a33ae0c9cb16eaac3641abc00f56316f (diff) | |
download | lwn-1399dfcdfe89898ccd791216f9679ba734aea910.tar.gz lwn-1399dfcdfe89898ccd791216f9679ba734aea910.zip |
ACPI / PM: Introduce os_accessible flag for power_state
Currently we have valid flag to represent if this ACPI device power
state is valid. A device power state is valid does not necessarily
mean we, as OSPM, has a mean to put the device into that power state,
e.g. D3 cold is always a valid power state for any ACPI device, but if
there is no _PS3 or _PRx for this device, we can't really put that
device into D3 cold power state. The same is true for D0 power state.
So here comes the os_accessible flag, which is only set if the device
has provided us the required means to put it into that power state,
e.g. if we have _PS3 or _PRx, we can put the device into D3 cold state
and thus, D3 cold power state's os_accessible flag will be set in this
case.
And a new wrapper inline function is added to be used to check if
firmware has provided us a way to power off the device during runtime.
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi/acpi_bus.h')
-rw-r--r-- | include/acpi/acpi_bus.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 80155fda517f..c3bc4511e0c0 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -201,6 +201,7 @@ struct acpi_device_power_flags { struct acpi_device_power_state { struct { u8 valid:1; + u8 os_accessible:1; u8 explicit_set:1; /* _PSx present? */ u8 reserved:6; } flags; @@ -500,6 +501,11 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev) return adev->wakeup.flags.valid; } +static inline bool acpi_device_can_poweroff(struct acpi_device *adev) +{ + return adev->power.states[ACPI_STATE_D3_COLD].flags.os_accessible; +} + #else /* CONFIG_ACPI */ static inline int register_acpi_bus_type(void *bus) { return 0; } |