diff options
| -rw-r--r-- | drivers/acpi/glue.c | 14 | ||||
| -rw-r--r-- | drivers/acpi/scan.c | 7 | ||||
| -rw-r--r-- | include/acpi/acpi_bus.h | 3 |
3 files changed, 19 insertions, 5 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 204fe94c7e45..a194f30876c5 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -75,7 +75,8 @@ static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) } #define FIND_CHILD_MIN_SCORE 1 -#define FIND_CHILD_MAX_SCORE 2 +#define FIND_CHILD_MID_SCORE 2 +#define FIND_CHILD_MAX_SCORE 3 static int match_any(struct acpi_device *adev, void *not_used) { @@ -96,8 +97,17 @@ static int find_child_checks(struct acpi_device *adev, bool check_children) return -ENODEV; status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); - if (status == AE_NOT_FOUND) + if (status == AE_NOT_FOUND) { + /* + * Special case: backlight device objects without _STA are + * preferred to other objects with the same _ADR value, because + * it is more likely that they are actually useful. + */ + if (adev->pnp.type.backlight) + return FIND_CHILD_MID_SCORE; + return FIND_CHILD_MIN_SCORE; + } if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) return -ENODEV; diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 274344434282..0c6f06abe3f4 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1370,9 +1370,12 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, * Some devices don't reliably have _HIDs & _CIDs, so add * synthetic HIDs to make sure drivers can find them. */ - if (acpi_is_video_device(handle)) + if (acpi_is_video_device(handle)) { acpi_add_id(pnp, ACPI_VIDEO_HID); - else if (acpi_bay_match(handle)) + pnp->type.backlight = 1; + break; + } + if (acpi_bay_match(handle)) acpi_add_id(pnp, ACPI_BAY_HID); else if (acpi_dock_match(handle)) acpi_add_id(pnp, ACPI_DOCK_HID); diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index cd3b75e08ec3..e44be31115a6 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -230,7 +230,8 @@ struct acpi_pnp_type { u32 hardware_id:1; u32 bus_address:1; u32 platform_id:1; - u32 reserved:29; + u32 backlight:1; + u32 reserved:28; }; struct acpi_device_pnp { |