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| author | Jiang Liu <jiang.liu@linux.intel.com> | 2013-12-19 20:38:10 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-01-05 16:07:14 +0100 |
| commit | a65ac52041cccaf598995bc44340849027f1d79b (patch) | |
| tree | 66feec04a0a904218e076cae1296dd3bbad862f6 /include | |
| parent | e73be4a78b500374a1c42810dc073189036b4dd8 (diff) | |
| download | lwn-a65ac52041cccaf598995bc44340849027f1d79b.tar.gz lwn-a65ac52041cccaf598995bc44340849027f1d79b.zip | |
ACPI: introduce helper interfaces for _DSM method
There are several drivers making use of ACPI _DSM method to detect
and invoke device specific methods. Currently every driver has
implemented its private version to support ACPI _DSM method.
So this patch introduces three helper functions to support ACPI _DSM
method, which will be used to replace open-coded versions.
It helps to simplify code and improve code readability.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/acpi/acpi_bus.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index ddabed1f51c2..dd9b5edc7630 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -66,6 +66,32 @@ bool acpi_ata_match(acpi_handle handle); bool acpi_bay_match(acpi_handle handle); bool acpi_dock_match(acpi_handle handle); +bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs); +union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, + int rev, int func, union acpi_object *argv4); + +static inline union acpi_object * +acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func, + union acpi_object *argv4, acpi_object_type type) +{ + union acpi_object *obj; + + obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4); + if (obj && obj->type != type) { + ACPI_FREE(obj); + obj = NULL; + } + + return obj; +} + +#define ACPI_INIT_DSM_ARGV4(cnt, eles) \ + { \ + .package.type = ACPI_TYPE_PACKAGE, \ + .package.count = (cnt), \ + .package.elements = (eles) \ + } + #ifdef CONFIG_ACPI #include <linux/proc_fs.h> |