thinkpad-acpi: find ACPI video device by synthetic HID

The Linux ACPI core locates the ACPI video devices for us and marks them
with ACPI_VIDEO_HID.  Use that information to locate the video device
instead of a half-baked hunt for _BCL.

This uncouples the detection of the number of backlight brightness
levels on ThinkPads from the ACPI paths in vid_handle.

With this change, the driver should be able to always detect whether the
ThinkPad uses a 8-level or 16-level brightness scale even on newer
models for which the vid_handle paths have not been updated yet.

It will skip deactivated devices in the ACPI device tree, which is a
change in behaviour.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 5d6119b..9d6fc4c 100644 (file)
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -6080,13 +6080,18 @@ static struct backlight_ops ibm_backlight_data = {
 
 /* --------------------------------------------------------------------- */
 
+/*
+ * Call _BCL method of video device.  On some ThinkPads this will
+ * switch the firmware to the ACPI brightness control mode.
+ */
+
 static int __init tpacpi_query_bcl_levels(acpi_handle handle)
 {
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        int rc;
 
-       if (ACPI_SUCCESS(acpi_evaluate_object(handle, NULL, NULL, &buffer))) {
+       if (ACPI_SUCCESS(acpi_evaluate_object(handle, "_BCL", NULL, &buffer))) {
                obj = (union acpi_object *)buffer.pointer;
                if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
                        printk(TPACPI_ERR "Unknown _BCL data, "
@@ -6103,55 +6108,22 @@ static int __init tpacpi_query_bcl_levels(acpi_handle handle)
        return rc;
 }
 
-static acpi_status __init tpacpi_acpi_walk_find_bcl(acpi_handle handle,
-                                       u32 lvl, void *context, void **rv)
-{
-       char name[ACPI_PATH_SEGMENT_LENGTH];
-       struct acpi_buffer buffer = { sizeof(name), &name };
-
-       if (ACPI_SUCCESS(acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer)) &&
-           !strncmp("_BCL", name, sizeof(name) - 1)) {
-               BUG_ON(!rv || !*rv);
-               **(int **)rv = tpacpi_query_bcl_levels(handle);
-               return AE_CTRL_TERMINATE;
-       } else {
-               return AE_OK;
-       }
-}
 
 /*
  * Returns 0 (no ACPI _BCL or _BCL invalid), or size of brightness map
  */
 static unsigned int __init tpacpi_check_std_acpi_brightness_support(void)
 {
-       int status;
+       acpi_handle video_device;
        int bcl_levels = 0;
-       void *bcl_ptr = &bcl_levels;
 
-       if (!vid_handle)
-               TPACPI_ACPIHANDLE_INIT(vid);
+       tpacpi_acpi_handle_locate("video", ACPI_VIDEO_HID, &video_device);
+       if (video_device)
+               bcl_levels = tpacpi_query_bcl_levels(video_device);
 
-       if (!vid_handle)
-               return 0;
-
-       /*
-        * Search for a _BCL method, and execute it.  This is safe on all
-        * ThinkPads, and as a side-effect, _BCL will place a Lenovo Vista
-        * BIOS in ACPI backlight control mode.  We do NOT have to care
-        * about calling the _BCL method in an enabled video device, any
-        * will do for our purposes.
-        */
+       tp_features.bright_acpimode = (bcl_levels > 0);
 
-       status = acpi_walk_namespace(ACPI_TYPE_METHOD, vid_handle, 3,
-                                    tpacpi_acpi_walk_find_bcl, NULL, NULL,
-                                    &bcl_ptr);
-
-       if (ACPI_SUCCESS(status) && bcl_levels > 2) {
-               tp_features.bright_acpimode = 1;
-               return bcl_levels - 2;
-       }
-
-       return 0;
+       return (bcl_levels > 2) ? (bcl_levels - 2) : 0;
 }
 
 /*