diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/glue.c | 2 | ||||
| -rw-r--r-- | drivers/acpi/utils.c | 30 |
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 29a4a5c8ee0..1564e0927c2 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -69,6 +69,7 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) up_read(&bus_type_sem); return ret; } +EXPORT_SYMBOL_GPL(register_acpi_bus_type); static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) { @@ -85,6 +86,7 @@ static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) up_read(&bus_type_sem); return ret; } +EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); /* Get device's handler per its address under its parent */ struct acpi_find_child { 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); |