summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/vga16fb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/fbdev/vga16fb.c')
-rw-r--r--drivers/video/fbdev/vga16fb.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c
index e2757ff1c23d..96e312a3eac7 100644
--- a/drivers/video/fbdev/vga16fb.c
+++ b/drivers/video/fbdev/vga16fb.c
@@ -184,6 +184,25 @@ static inline void setindex(int index)
vga_io_w(VGA_GFX_I, index);
}
+/* Check if the video mode is supported by the driver */
+static inline int check_mode_supported(void)
+{
+ /* non-x86 architectures treat orig_video_isVGA as a boolean flag */
+#if defined(CONFIG_X86)
+ /* only EGA and VGA in 16 color graphic mode are supported */
+ if (screen_info.orig_video_isVGA != VIDEO_TYPE_EGAC &&
+ screen_info.orig_video_isVGA != VIDEO_TYPE_VGAC)
+ return -ENODEV;
+
+ if (screen_info.orig_video_mode != 0x0D && /* 320x200/4 (EGA) */
+ screen_info.orig_video_mode != 0x0E && /* 640x200/4 (EGA) */
+ screen_info.orig_video_mode != 0x10 && /* 640x350/4 (EGA) */
+ screen_info.orig_video_mode != 0x12) /* 640x480/4 (VGA) */
+ return -ENODEV;
+#endif
+ return 0;
+}
+
static void vga16fb_pan_var(struct fb_info *info,
struct fb_var_screeninfo *var)
{
@@ -1422,6 +1441,11 @@ static int __init vga16fb_init(void)
vga16fb_setup(option);
#endif
+
+ ret = check_mode_supported();
+ if (ret)
+ return ret;
+
ret = platform_driver_register(&vga16fb_driver);
if (!ret) {