ACPI: thinkpad-acpi: make the video output feature optional

The video output port control feature is not very useful on many ThinkPads
(especially when a X server is running), and lately userspace is getting
better and better at it, so it makes sense to allow users to stripe out the
thinkpad-acpi video feature from their kernels and save at least 2KB.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 30 insertions, 7 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 1abc95ca9dfa..982e27b86d10 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -258,6 +258,23 @@ config THINKPAD_ACPI_BAY
 
           If you are not sure, say Y here.
 
+config THINKPAD_ACPI_VIDEO
+        bool "Video output control support"
+        depends on THINKPAD_ACPI
+        default y
+        ---help---
+          Allows the thinkpad_acpi driver to provide an interface to control
+          the various video output ports.
+
+          This feature often won't work well, depending on ThinkPad model,
+          display state, video output devices in use, whether there is a X
+          server running, phase of the moon, and the current mood of
+          Schroedinger's cat.  If you can use X.org's RandR to control
+          your ThinkPad's video output ports instead of this feature,
+          don't think twice: do it and say N here to save some memory.
+
+          If you are not sure, say Y here.
+
 config THINKPAD_ACPI_HOTKEY_POLL
         bool "Suport NVRAM polling for hot keys"
         depends on THINKPAD_ACPI
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 02f946516584..4ea3866ddf90 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -301,6 +301,13 @@ TPACPI_HANDLE(hkey, ec, "\\_SB.HKEY",	/* 600e/x, 770e, 770x */
            "HKEY",              /* all others */
            );                   /* 570 */
 
+TPACPI_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",   /* 570 */
+           "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
+           "\\_SB.PCI0.VID0",   /* 770e */
+           "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
+           "\\_SB.PCI0.AGP.VID",        /* all others */
+           );                           /* R30, R31 */
+
 
 /*************************************************************************
  * ACPI helpers
@@ -2680,6 +2687,8 @@ static struct ibm_struct wan_driver_data = {
  * Video subdriver
  */
 
+#ifdef CONFIG_THINKPAD_ACPI_VIDEO
+
 enum video_access_mode {
         TPACPI_VIDEO_NONE = 0,
         TPACPI_VIDEO_570,       /* 570 */
@@ -2707,13 +2716,6 @@ static int video_orig_autosw;
 static int video_autosw_get(void);
 static int video_autosw_set(int enable);
 
-TPACPI_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",   /* 570 */
-           "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
-           "\\_SB.PCI0.VID0",   /* 770e */
-           "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
-           "\\_SB.PCI0.AGP.VID",        /* all others */
-           );                           /* R30, R31 */
-
 TPACPI_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");       /* G41 */
 
 static int __init video_init(struct ibm_init_struct *iibm)
@@ -3023,6 +3025,8 @@ static struct ibm_struct video_driver_data = {
         .exit = video_exit,
 };
 
+#endif /* CONFIG_THINKPAD_ACPI_VIDEO */
+
 /*************************************************************************
  * Light (thinklight) subdriver
  */
@@ -5807,10 +5811,12 @@ static struct ibm_init_struct ibms_init[] __initdata = {
                 .init = wan_init,
                 .data = &wan_driver_data,
         },
+#ifdef CONFIG_THINKPAD_ACPI_VIDEO
         {
                 .init = video_init,
                 .data = &video_driver_data,
         },
+#endif
         {
                 .init = light_init,
                 .data = &light_driver_data,