static int
dsm_get_label(acpi_handle handle, int func,
struct acpi_buffer *output,
char *buf, enum acpi_attr_enum attribute)
{
struct acpi_object_list input;
union acpi_object params[4];
union acpi_object *obj;
int len = 0;
int err;
input.count = 4;
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
params[0].buffer.length = sizeof(device_label_dsm_uuid);
params[0].buffer.pointer = (char *)device_label_dsm_uuid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 0x02;
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = func;
params[3].type = ACPI_TYPE_PACKAGE;
params[3].package.count = 0;
params[3].package.elements = NULL;
err = acpi_evaluate_object(handle, "_DSM", &input, output);
if (err)
return -1;
obj = (union acpi_object *)output->pointer;
switch (obj->type) {
case ACPI_TYPE_PACKAGE:
if (obj->package.count != 2)
break;
len = obj->package.elements[0].integer.value;
if (buf) {
if (attribute == ACPI_ATTR_INDEX_SHOW)
scnprintf(buf, PAGE_SIZE, "%llu\n",
obj->package.elements[0].integer.value);
else if (attribute == ACPI_ATTR_LABEL_SHOW)
dsm_label_utf16s_to_utf8s(obj, buf);
kfree(output->pointer);
return strlen(buf);
}
kfree(output->pointer);
return len;
break;
default:
kfree(output->pointer);
}
return -1;
}
static int dsm_get_label(struct device *dev, char *buf,
enum acpi_attr_enum attr)
{
acpi_handle handle;
union acpi_object *obj, *tmp;
int len = -1;
handle = ACPI_HANDLE(dev);
if (!handle)
return -1;
obj = acpi_evaluate_dsm(handle, device_label_dsm_uuid, 0x2,
DEVICE_LABEL_DSM, NULL);
if (!obj)
return -1;
tmp = obj->package.elements;
if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 2 &&
tmp[0].type == ACPI_TYPE_INTEGER &&
(tmp[1].type == ACPI_TYPE_STRING ||
tmp[1].type == ACPI_TYPE_BUFFER)) {
/*
* The second string element is optional even when
* this _DSM is implemented; when not implemented,
* this entry must return a null string.
*/
if (attr == ACPI_ATTR_INDEX_SHOW) {
scnprintf(buf, PAGE_SIZE, "%llu\n", tmp->integer.value);
} else if (attr == ACPI_ATTR_LABEL_SHOW) {
if (tmp[1].type == ACPI_TYPE_STRING)
scnprintf(buf, PAGE_SIZE, "%s\n",
tmp[1].string.pointer);
else if (tmp[1].type == ACPI_TYPE_BUFFER)
dsm_label_utf16s_to_utf8s(tmp + 1, buf);
}
len = strlen(buf) > 0 ? strlen(buf) : -1;
}
ACPI_FREE(obj);
return len;
}