nvidiafb: VGA state save and restore

Allow the saving and restoration of VGA text mode. The state is saved on the first open and restored on the last close. Because of the non-linear mapping of the VGA registers to the MMIO space, this will be done only on X86 platforms where the device is the primary display.

An echo 0 > /sys/class/vtconsole/vtcon1/bind will convert the display from graphics to text mode.

---

 drivers/video/Makefile         |    2 +
 drivers/video/nvidia/nv_type.h |    6 +++
 drivers/video/nvidia/nvidia.c  |   74 +++++++++++++++++++++++++++++++++++++++-
 3 files changed, 80 insertions(+), 2 deletions(-)

index 3b24098..13ab41b 100644
@@ -32,7 +32,7 @@ obj-$(CONFIG_FB_PM3)		  += pm3fb.o
 
 obj-$(CONFIG_FB_MATROX)		  += matrox/
 obj-$(CONFIG_FB_RIVA)		  += riva/ vgastate.o
-obj-$(CONFIG_FB_NVIDIA)		  += nvidia/
+obj-$(CONFIG_FB_NVIDIA)		  += nvidia/ vgastate.o
 obj-$(CONFIG_FB_ATY)		  += aty/ macmodes.o
 obj-$(CONFIG_FB_ATY128)		  += aty/ macmodes.o
 obj-$(CONFIG_FB_RADEON)		  += aty/

index ee430af..38f7cc0 100644
@@ -5,6 +5,8 @@ #include <linux/fb.h>
 #include <linux/types.h>
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
+#include <linux/mutex.h>
+#include <video/vga.h>
 
 #define NV_ARCH_04  0x04
 #define NV_ARCH_10  0x10

@@ -93,7 +95,10 @@ struct riva_regs {
 struct nvidia_par {
 	RIVA_HW_STATE SavedReg;
 	RIVA_HW_STATE ModeReg;
+	RIVA_HW_STATE initial_state;
 	RIVA_HW_STATE *CurrentState;
+	struct vgastate vgastate;
+	struct mutex open_lock;
 	u32 pseudo_palette[16];
 	struct pci_dev *pci_dev;
 	u32 Architecture;

@@ -141,6 +146,7 @@ struct nvidia_par {
 	int BlendingPossible;
 	u32 paletteEnabled;
 	u32 forceCRTC;
+	u32 open_count;
 	u8 DDCBase;
 #ifdef CONFIG_MTRR
 	struct {

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