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| author | Matthew Garrett <mjg@redhat.com> | 2012-05-11 16:08:26 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-11 17:03:12 -0700 |
| commit | 38ac0f1b90dc9486cc039f1a4d8b0202813e5b67 (patch) | |
| tree | 906f48f2bfb685d6075b74f50bc338768014ca3e | |
| parent | 66886d6f8c9bcdee3d7fce5796dcffd6b4bc0b48 (diff) | |
| download | linux-3.10-38ac0f1b90dc9486cc039f1a4d8b0202813e5b67.tar.gz linux-3.10-38ac0f1b90dc9486cc039f1a4d8b0202813e5b67.tar.bz2 linux-3.10-38ac0f1b90dc9486cc039f1a4d8b0202813e5b67.zip | |
ACPI: Add _PLD support
Add a simple helper function to allow drivers to obtain the physical
device location data.
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/acpi/utils.c | 30 | ||||
| -rw-r--r-- | include/acpi/acpi_bus.h | 31 |
2 files changed, 61 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index b002a471c5d..adbbc1c80a2 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -382,3 +382,33 @@ acpi_evaluate_reference(acpi_handle handle, } EXPORT_SYMBOL(acpi_evaluate_reference); + +acpi_status +acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld) +{ + acpi_status status; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *output; + + status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); + + if (ACPI_FAILURE(status)) + return status; + + output = buffer.pointer; + + if (!output || output->type != ACPI_TYPE_PACKAGE + || !output->package.count + || output->package.elements[0].type != ACPI_TYPE_BUFFER + || output->package.elements[0].buffer.length > sizeof(*pld)) { + status = AE_TYPE; + goto out; + } + + memcpy(pld, output->package.elements[0].buffer.pointer, + output->package.elements[0].buffer.length); +out: + kfree(buffer.pointer); + return status; +} +EXPORT_SYMBOL(acpi_get_physical_device_location); diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index c909984d072..b0d62820ada 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -51,6 +51,37 @@ acpi_evaluate_reference(acpi_handle handle, struct acpi_object_list *arguments, struct acpi_handle_list *list); +struct acpi_pld { + unsigned int revision:7; /* 0 */ + unsigned int ignore_colour:1; /* 7 */ + unsigned int colour:24; /* 8 */ + unsigned int width:16; /* 32 */ + unsigned int height:16; /* 48 */ + unsigned int user_visible:1; /* 64 */ + unsigned int dock:1; /* 65 */ + unsigned int lid:1; /* 66 */ + unsigned int panel:3; /* 67 */ + unsigned int vertical_pos:2; /* 70 */ + unsigned int horizontal_pos:2; /* 72 */ + unsigned int shape:4; /* 74 */ + unsigned int group_orientation:1; /* 78 */ + unsigned int group_token:8; /* 79 */ + unsigned int group_position:8; /* 87 */ + unsigned int bay:1; /* 95 */ + unsigned int ejectable:1; /* 96 */ + unsigned int ospm_eject_required:1; /* 97 */ + unsigned int cabinet_number:8; /* 98 */ + unsigned int card_cage_number:8; /* 106 */ + unsigned int reference:1; /* 114 */ + unsigned int rotation:4; /* 115 */ + unsigned int order:5; /* 119 */ + unsigned int reserved:4; /* 124 */ + unsigned int vertical_offset:16; /* 128 */ + unsigned int horizontal_offset:16; /* 144 */ +} __attribute__((__packed__)); + +acpi_status +acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld); #ifdef CONFIG_ACPI #include <linux/proc_fs.h> |