ACPI: video: delete unused display switch on hotkey event code

Display switching via ACPI control methods are
not known to work on any platforms.

Further, the X community wants to control the display
switching all by themselves without BIOS/AML involvement.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index b1a56bf682ae992befd4510cc59173a9a8507eaa..d4b4b52facbaea6721a18b3415e2144aac7b636d 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -276,7 +276,6 @@ static void acpi_video_device_rebind(struct acpi_video_bus *video);
 static void acpi_video_device_bind(struct acpi_video_bus *video,
                                   struct acpi_video_device *device);
 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
-static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
                        int level);
 static int acpi_video_device_lcd_get_level_current(
@@ -1583,64 +1582,6 @@ static int acpi_video_device_enumerate(struct acpi_video_bus *video)
        return status;
 }
 
-/*
- *  Arg:
- *     video   : video bus device 
- *     event   : notify event
- *
- *  Return:
- *     < 0     : error
- *  
- *     1. Find out the current active output device.
- *     2. Identify the next output device to switch to.
- *     3. call _DSS to do actual switch.
- */
-
-static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
-{
-       struct list_head *node;
-       struct acpi_video_device *dev = NULL;
-       struct acpi_video_device *dev_next = NULL;
-       struct acpi_video_device *dev_prev = NULL;
-       unsigned long state;
-       int status = 0;
-
-       mutex_lock(&video->device_list_lock);
-
-       list_for_each(node, &video->video_device_list) {
-               dev = container_of(node, struct acpi_video_device, entry);
-               status = acpi_video_device_get_state(dev, &state);
-               if (state & 0x2) {
-                       dev_next = container_of(node->next,
-                                       struct acpi_video_device, entry);
-                       dev_prev = container_of(node->prev,
-                                       struct acpi_video_device, entry);
-                       goto out;
-               }
-       }
-
-       dev_next = container_of(node->next, struct acpi_video_device, entry);
-       dev_prev = container_of(node->prev, struct acpi_video_device, entry);
-
- out:
-       mutex_unlock(&video->device_list_lock);
-
-       switch (event) {
-       case ACPI_VIDEO_NOTIFY_CYCLE:
-       case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
-               acpi_video_device_set_state(dev, 0);
-               acpi_video_device_set_state(dev_next, 0x80000001);
-               break;
-       case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
-               acpi_video_device_set_state(dev, 0);
-               acpi_video_device_set_state(dev_prev, 0x80000001);
-       default:
-               break;
-       }
-
-       return status;
-}
-
 static int
 acpi_video_get_next_level(struct acpi_video_device *device,
                          u32 level_current, u32 event)
@@ -1800,23 +1741,19 @@ static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
                                         * connector. */
                acpi_video_device_enumerate(video);
                acpi_video_device_rebind(video);
-               acpi_video_switch_output(video, event);
                acpi_bus_generate_proc_event(device, event, 0);
                keycode = KEY_SWITCHVIDEOMODE;
                break;
 
        case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
-               acpi_video_switch_output(video, event);
                acpi_bus_generate_proc_event(device, event, 0);
                keycode = KEY_SWITCHVIDEOMODE;
                break;
        case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
-               acpi_video_switch_output(video, event);
                acpi_bus_generate_proc_event(device, event, 0);
                keycode = KEY_VIDEO_NEXT;
                break;
        case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
-               acpi_video_switch_output(video, event);
                acpi_bus_generate_proc_event(device, event, 0);
                keycode = KEY_VIDEO_PREV;
                break;