[PATCH] vesafb: Add blanking support
Add rudimentary support by manipulating the VGA registers. However, not
all vesa modes are VGA compatible, so VGA compatiblity is checked first.
Only 2 levels are supported, powerup and powerdown.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c
index a272592..1ca80264 100644
--- a/drivers/video/vesafb.c
+++ b/drivers/video/vesafb.c
@@ -19,6 +19,7 @@
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
+#include <video/vga.h>
#include <asm/io.h>
#include <asm/mtrr.h>
@@ -54,6 +55,7 @@
static void (*pmi_start)(void);
static void (*pmi_pal)(void);
static int depth;
+static int vga_compat;
/* --------------------------------------------------------------------- */
@@ -86,6 +88,37 @@
return 0;
}
+static int vesafb_blank(int blank, struct fb_info *info)
+{
+ int err = 1;
+
+ if (vga_compat) {
+ int loop = 10000;
+ u8 seq = 0, crtc17 = 0;
+
+ err = 0;
+
+ if (blank) {
+ seq = 0x20;
+ crtc17 = 0x00;
+ } else {
+ seq = 0x00;
+ crtc17 = 0x80;
+ }
+
+ vga_wseq(NULL, 0x00, 0x01);
+ seq |= vga_rseq(NULL, 0x01) & ~0x20;
+ vga_wseq(NULL, 0x00, seq);
+
+ crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
+ while (loop--);
+ vga_wcrt(NULL, 0x17, crtc17);
+ vga_wseq(NULL, 0x00, 0x03);
+ }
+
+ return err;
+}
+
static void vesa_setpalette(int regno, unsigned red, unsigned green,
unsigned blue)
{
@@ -176,6 +209,7 @@
.owner = THIS_MODULE,
.fb_setcolreg = vesafb_setcolreg,
.fb_pan_display = vesafb_pan_display,
+ .fb_blank = vesafb_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
@@ -429,6 +463,10 @@
info->flags = FBINFO_FLAG_DEFAULT |
(ypan) ? FBINFO_HWACCEL_YPAN : 0;
+ vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
+ printk("vesafb: Mode is %sVGA compatible\n",
+ (vga_compat) ? "" : "not ");
+
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENOMEM;
goto err;