V4L/DVB (5902): Add ivtv-fb framebuffer driver.

Add the ivtv-fb framebuffer driver for cx23415 devices (currently
only the Hauppauge PVR-350 cards). This makes it possible to use
the On-Screen Display functionality of these cards, either for menus
during MPEG playback, or as a console or X display.
Signed-off-by: Kevin Thayer <nufan_wfk@yahoo.com>
Signed-off-by: Chris Kennedy <c@groovy.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: John P Harvey <john.p.harvey@btinternet.com>
Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/Kconfig

@@ -25,3 +25,19 @@ config VIDEO_IVTV
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ivtv.
+
+config VIDEO_IVTV_FB
+	tristate "Conexant cx23415 framebuffer support"
+	depends on VIDEO_IVTV && FB && EXPERIMENTAL
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	---help---
+	  This is a framebuffer driver for the Conexant cx23415 MPEG
+	  encoder/decoder.
+
+	  This is used in the Hauppauge PVR-350 card. There is a driver
+	  homepage at <http://www.ivtvdriver.org>.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ivtv-fb.

drivers/media/video/ivtv/Makefile

@@ -5,3 +5,4 @@ ivtv-objs	:= ivtv-audio.o ivtv-cards.o ivtv-controls.o \
 		   ivtv-vbi.o ivtv-video.o ivtv-yuv.o
 
 obj-$(CONFIG_VIDEO_IVTV) += ivtv.o
+obj-$(CONFIG_VIDEO_IVTV_FB) += ivtv-fb.o

drivers/media/video/ivtv/ivtv-driver.c

@@ -95,8 +95,14 @@ const u32 yuv_offset[4] = {
 
 /* Parameter declarations */
 static int cardtype[IVTV_MAX_CARDS];
-static int tuner[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
-static int radio[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
+static int tuner[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1 };
+static int radio[IVTV_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1,
+				     -1, -1, -1, -1, -1, -1, -1, -1 };
 
 static int cardtype_c = 1;
 static int tuner_c = 1;
@@ -1242,8 +1248,10 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
 		retval = -ENODEV;
 	IVTV_ERR("Error %d on initialization\n", retval);
 
+	spin_lock(&ivtv_cards_lock);
 	kfree(ivtv_cards[ivtv_cards_active]);
 	ivtv_cards[ivtv_cards_active] = NULL;
+	spin_unlock(&ivtv_cards_lock);
 	return retval;
 }
 
@@ -1346,6 +1354,7 @@ static void module_cleanup(void)
 
 	pci_unregister_driver(&ivtv_pci_driver);
 
+	spin_lock(&ivtv_cards_lock);
 	for (i = 0; i < ivtv_cards_active; i++) {
 		if (ivtv_cards[i] == NULL)
 			continue;
@@ -1354,6 +1363,7 @@ static void module_cleanup(void)
 		}
 		kfree(ivtv_cards[i]);
 	}
+	spin_unlock(&ivtv_cards_lock);
 }
 
 /* Note: These symbols are exported because they are used by the ivtv-fb
@@ -1361,6 +1371,7 @@ static void module_cleanup(void)
 EXPORT_SYMBOL(ivtv_set_irq_mask);
 EXPORT_SYMBOL(ivtv_cards_active);
 EXPORT_SYMBOL(ivtv_cards);
+EXPORT_SYMBOL(ivtv_cards_lock);
 EXPORT_SYMBOL(ivtv_api);
 EXPORT_SYMBOL(ivtv_vapi);
 EXPORT_SYMBOL(ivtv_vapi_result);

drivers/media/video/ivtv/ivtv-driver.h

@@ -89,11 +89,9 @@
 
 extern const u32 yuv_offset[4];
 
-/* Maximum ivtv driver instances.
-   Based on 6 PVR500s each with two PVR15s...
-   TODO: make this dynamic. I believe it is only a global in order to support
-    ivtv-fb. There must be a better way to do that. */
-#define IVTV_MAX_CARDS 12
+/* Maximum ivtv driver instances. Some people have a huge number of
+   capture cards, so set this to a high value. */
+#define IVTV_MAX_CARDS 32
 
 /* Supported cards */
 #define IVTV_CARD_PVR_250 	      0	/* WinTV PVR 250 */
@@ -303,28 +301,10 @@ extern const u32 yuv_offset[4];
 #define IVTV_DEBUG_HI_DEC(fmt, args...)   IVTV_DEBUG_HIGH_VOL(IVTV_DBGFLG_DEC, "dec", fmt , ## args)
 #define IVTV_DEBUG_HI_YUV(fmt, args...)   IVTV_DEBUG_HIGH_VOL(IVTV_DBGFLG_YUV, "yuv", fmt , ## args)
 
-#define IVTV_FB_DEBUG(x, type, fmt, args...) \
-	do { \
-		if ((x) & ivtv_debug) \
-			printk(KERN_INFO "ivtv%d-fb " type ": " fmt, itv->num , ## args); \
-	} while (0)
-#define IVTV_FB_DEBUG_WARN(fmt, args...)  IVTV_FB_DEBUG(IVTV_DBGFLG_WARN, "warning", fmt , ## args)
-#define IVTV_FB_DEBUG_INFO(fmt, args...)  IVTV_FB_DEBUG(IVTV_DBGFLG_INFO, "info", fmt , ## args)
-#define IVTV_FB_DEBUG_API(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_API, "api", fmt , ## args)
-#define IVTV_FB_DEBUG_DMA(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_DMA, "dma", fmt , ## args)
-#define IVTV_FB_DEBUG_IOCTL(fmt, args...) IVTV_FB_DEBUG(IVTV_DBGFLG_IOCTL, "ioctl", fmt , ## args)
-#define IVTV_FB_DEBUG_I2C(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_I2C, "i2c", fmt , ## args)
-#define IVTV_FB_DEBUG_IRQ(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_IRQ, "irq", fmt , ## args)
-#define IVTV_FB_DEBUG_DEC(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_DEC, "dec", fmt , ## args)
-#define IVTV_FB_DEBUG_YUV(fmt, args...)   IVTV_FB_DEBUG(IVTV_DBGFLG_YUV, "yuv", fmt , ## args)
-
 /* Standard kernel messages */
 #define IVTV_ERR(fmt, args...)      printk(KERN_ERR  "ivtv%d: " fmt, itv->num , ## args)
 #define IVTV_WARN(fmt, args...)     printk(KERN_WARNING "ivtv%d: " fmt, itv->num , ## args)
 #define IVTV_INFO(fmt, args...)     printk(KERN_INFO "ivtv%d: " fmt, itv->num , ## args)
-#define IVTV_FB_ERR(fmt, args...)   printk(KERN_ERR  "ivtv%d-fb: " fmt, itv->num , ## args)
-#define IVTV_FB_WARN(fmt, args...)  printk(KERN_WARNING  "ivtv%d-fb: " fmt, itv->num , ## args)
-#define IVTV_FB_INFO(fmt, args...)  printk(KERN_INFO "ivtv%d-fb: " fmt, itv->num , ## args)
 
 /* Values for IVTV_API_DEC_PLAYBACK_SPEED mpeg_frame_type_mask parameter: */
 #define MPEG_FRAME_TYPE_IFRAME 1

drivers/media/video/ivtv/ivtv-fb.c

+/*
+    On Screen Display cx23415 Framebuffer driver
+
+    This module presents the cx23415 OSD (onscreen display) framebuffer memory
+    as a standard Linux /dev/fb style framebuffer device. The framebuffer has
+    support for 8,16 & 32 bpp packed pixel formats with alpha channel. In 16bpp
+    mode, there is a choice of a three color depths (12, 15 or 16 bits), but no
+    local alpha. The colorspace is selectable between rgb & yuv.
+    Depending on the TV standard configured in the ivtv module at load time,
+    the initial resolution is either 640x400 (NTSC) or 640x480 (PAL) at 8bpp.
+    Video timings are locked to ensure a vertical refresh rate of 50Hz (PAL)
+    or 59.94 (NTSC)
+
+    Copyright (c) 2003 Matt T. Yourst <yourst@yourst.com>
+
+    Derived from drivers/video/vesafb.c
+    Portions (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
+
+    2.6 kernel port:
+    Copyright (C) 2004 Matthias Badaire
+
+    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
+
+    Copyright (C) 2006  Ian Armstrong <ian@iarmst.demon.co.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/fb.h>
+#include <linux/console.h>
+#include <linux/bitops.h>
+#include <linux/pagemap.h>
+#include <linux/matroxfb.h>
+
+#include <asm/io.h>
+#include <asm/ioctl.h>
+
+#ifdef CONFIG_MTRR
+#include <asm/mtrr.h>
+#endif
+
+#include "ivtv-driver.h"
+#include "ivtv-queue.h"
+#include "ivtv-udma.h"
+#include "ivtv-irq.h"
+#include "ivtv-fileops.h"
+#include "ivtv-mailbox.h"
+#include "ivtv-cards.h"
+#include <media/ivtv-fb.h>
+
+/* card parameters */
+static int ivtv_fb_card_id = -1;
+static int ivtv_fb_debug = 0;
+static int osd_laced;
+static int osd_compat;
+static int osd_depth;
+static int osd_upper;
+static int osd_left;
+static int osd_yres;
+static int osd_xres;
+
+module_param(ivtv_fb_card_id, int, 0444);
+module_param_named(debug,ivtv_fb_debug, int, 0644);
+module_param(osd_laced, bool, 0444);
+module_param(osd_compat, bool, 0444);
+module_param(osd_depth, int, 0444);
+module_param(osd_upper, int, 0444);
+module_param(osd_left, int, 0444);
+module_param(osd_yres, int, 0444);
+module_param(osd_xres, int, 0444);
+
+MODULE_PARM_DESC(ivtv_fb_card_id,
+		 "Only use framebuffer of the specified ivtv card (0-31)\n"
+		 "\t\t\tdefault -1: initialize all available framebuffers");
+
+MODULE_PARM_DESC(debug,
+		 "Debug level (bitmask). Default: errors only\n"
+		 "\t\t\t(debug = 3 gives full debugging)");
+
+MODULE_PARM_DESC(osd_compat,
+		 "Compatibility mode - Display size is locked (use for old X drivers)\n"
+		 "\t\t\t0=off\n"
+		 "\t\t\t1=on\n"
+		 "\t\t\tdefault off");
+
+/* Why upper, left, xres, yres, depth, laced ? To match terminology used
+   by fbset.
+   Why start at 1 for left & upper coordinate ? Because X doesn't allow 0 */
+
+MODULE_PARM_DESC(osd_laced,
+		 "Interlaced mode\n"
+		 "\t\t\t0=off\n"
+		 "\t\t\t1=on\n"
+		 "\t\t\tdefault off");
+
+MODULE_PARM_DESC(osd_depth,
+		 "Bits per pixel - 8,16,32\n"
+		 "\t\t\tdefault 8");
+
+MODULE_PARM_DESC(osd_upper,
+		 "Vertical start position\n"
+		 "\t\t\tdefault 0 (Centered)");
+
+MODULE_PARM_DESC(osd_left,
+		 "Horizontal start position\n"
+		 "\t\t\tdefault 0 (Centered)");
+
+MODULE_PARM_DESC(osd_yres,
+		 "Display height\n"
+		 "\t\t\tdefault 480 (PAL)\n"
+		 "\t\t\t        400 (NTSC)");
+
+MODULE_PARM_DESC(osd_xres,
+		 "Display width\n"
+		 "\t\t\tdefault 640");
+
+MODULE_AUTHOR("Kevin Thayer, Chris Kennedy, Hans Verkuil, John Harvey, Ian Armstrong");
+MODULE_LICENSE("GPL");
+
+/* --------------------------------------------------------------------- */
+
+#define IVTV_FB_DBGFLG_WARN  (1 << 0)
+#define IVTV_FB_DBGFLG_INFO  (1 << 1)
+
+#define IVTV_FB_DEBUG(x, type, fmt, args...) \
+	do { \
+		if ((x) & ivtv_fb_debug) \
+			printk(KERN_INFO "ivtv-fb%d " type ": " fmt, itv->num , ## args); \
+	} while (0)
+#define IVTV_FB_DEBUG_WARN(fmt, args...)  IVTV_FB_DEBUG(IVTV_FB_DBGFLG_WARN, "warning", fmt , ## args)
+#define IVTV_FB_DEBUG_INFO(fmt, args...)  IVTV_FB_DEBUG(IVTV_FB_DBGFLG_INFO, "info", fmt , ## args)
+
+/* Standard kernel messages */
+#define IVTV_FB_ERR(fmt, args...)   printk(KERN_ERR  "ivtv-fb%d: " fmt, itv->num , ## args)
+#define IVTV_FB_WARN(fmt, args...)  printk(KERN_WARNING  "ivtv-fb%d: " fmt, itv->num , ## args)
+#define IVTV_FB_INFO(fmt, args...)  printk(KERN_INFO "ivtv-fb%d: " fmt, itv->num , ## args)
+
+/* --------------------------------------------------------------------- */
+
+#define IVTV_OSD_MAX_WIDTH  720
+#define IVTV_OSD_MAX_HEIGHT 576
+
+#define IVTV_OSD_BPP_8      0x00
+#define IVTV_OSD_BPP_16_444 0x03
+#define IVTV_OSD_BPP_16_555 0x02
+#define IVTV_OSD_BPP_16_565 0x01
+#define IVTV_OSD_BPP_32     0x04
+
+struct osd_info {
+	/* Timing info for modes */
+	u32 pixclock;
+	u32 hlimit;
+	u32 vlimit;
+
+	/* Physical base address */
+	unsigned long video_pbase;
+	/* Relative base address (relative to start of decoder memory) */
+	u32 video_rbase;
+	/* Mapped base address */
+	volatile char __iomem *video_vbase;
+	/* Buffer size */
+	u32 video_buffer_size;
+
+#ifdef CONFIG_MTRR
+	/* video_base rounded down as required by hardware MTRRs */
+	unsigned long fb_start_aligned_physaddr;
+	/* video_base rounded up as required by hardware MTRRs */
+	unsigned long fb_end_aligned_physaddr;
+#endif
+
+	/* Store the buffer offset */
+	int set_osd_coords_x;
+	int set_osd_coords_y;
+
+	/* Current dimensions (NOT VISIBLE SIZE!) */
+	int display_width;
+	int display_height;
+	int display_byte_stride;
+
+	/* Current bits per pixel */
+	int bits_per_pixel;
+	int bytes_per_pixel;
+
+	/* Frame buffer stuff */
+	struct fb_info ivtvfb_info;
+	struct fb_var_screeninfo ivtvfb_defined;
+	struct fb_fix_screeninfo ivtvfb_fix;
+};
+
+struct ivtv_osd_coords {
+	unsigned long offset;
+	unsigned long max_offset;
+	int pixel_stride;
+	int lines;
+	int x;
+	int y;
+};
+
+/* --------------------------------------------------------------------- */
+
+/* ivtv API calls for framebuffer related support */
+
+static int ivtv_fb_get_framebuffer(struct ivtv *itv, u32 *fbbase,
+				       u32 *fblength)
+{
+	u32 data[CX2341X_MBOX_MAX_DATA];
+	int rc;
+
+	rc = ivtv_vapi_result(itv, data, CX2341X_OSD_GET_FRAMEBUFFER, 0);
+	*fbbase = data[0];
+	*fblength = data[1];
+	return rc;
+}
+
+static int ivtv_fb_get_osd_coords(struct ivtv *itv,
+				      struct ivtv_osd_coords *osd)
+{
+	u32 data[CX2341X_MBOX_MAX_DATA];
+
+	ivtv_vapi_result(itv, data, CX2341X_OSD_GET_OSD_COORDS, 0);
+
+	osd->offset = data[0] - itv->osd_info->video_rbase;
+	osd->max_offset = itv->osd_info->display_width * itv->osd_info->display_height * 4;
+	osd->pixel_stride = data[1];
+	osd->lines = data[2];
+	osd->x = data[3];
+	osd->y = data[4];
+	return 0;
+}
+
+static int ivtv_fb_set_osd_coords(struct ivtv *itv, const struct ivtv_osd_coords *osd)
+{
+	itv->osd_info->display_width = osd->pixel_stride;
+	itv->osd_info->display_byte_stride = osd->pixel_stride * itv->osd_info->bytes_per_pixel;
+	itv->osd_info->set_osd_coords_x += osd->x;
+	itv->osd_info->set_osd_coords_y = osd->y;
+
+	return ivtv_vapi(itv, CX2341X_OSD_SET_OSD_COORDS, 5,
+			osd->offset + itv->osd_info->video_rbase,
+			osd->pixel_stride,
+			osd->lines, osd->x, osd->y);
+}
+
+static int ivtv_fb_set_display_window(struct ivtv *itv, struct v4l2_rect *ivtv_window)
+{
+
+	int osd_height_limit = itv->is_50hz ? 576 : 480;
+
+	/* Only fail if resolution too high, otherwise fudge the start coords. */
+	if ((ivtv_window->height > osd_height_limit) || (ivtv_window->width > IVTV_OSD_MAX_WIDTH))
+		return -EINVAL;
+
+	/* Ensure we don't exceed display limits */
+	if (ivtv_window->top + ivtv_window->height > osd_height_limit) {
+		IVTV_FB_DEBUG_WARN("ivtv_ioctl_fb_set_display_window - Invalid height setting (%d,%d)\n",
+			ivtv_window->top, ivtv_window->height);
+		ivtv_window->top = osd_height_limit - ivtv_window->height;
+	}
+
+	if (ivtv_window->left + ivtv_window->width > IVTV_OSD_MAX_WIDTH) {
+		IVTV_FB_DEBUG_WARN("ivtv_ioctl_fb_set_display_window - Invalid width setting (%d,%d)\n",
+			ivtv_window->left, ivtv_window->width);
+		ivtv_window->left = IVTV_OSD_MAX_WIDTH - ivtv_window->width;
+	}
+
+	/* Set the OSD origin */
+	write_reg((ivtv_window->top << 16) | ivtv_window->left, 0x02a04);
+
+	/* How much to display */
+	write_reg(((ivtv_window->top+ivtv_window->height) << 16) | (ivtv_window->left+ivtv_window->width), 0x02a08);
+
+	/* Pass this info back the yuv handler */
+	itv->yuv_info.osd_vis_w = ivtv_window->width;
+	itv->yuv_info.osd_vis_h = ivtv_window->height;
+	itv->yuv_info.osd_x_offset = ivtv_window->left;
+	itv->yuv_info.osd_y_offset = ivtv_window->top;
+
+	return 0;
+}
+
+static int ivtv_fb_prep_dec_dma_to_device(struct ivtv *itv,
+				  unsigned long ivtv_dest_addr, void __user *userbuf,
+				  int size_in_bytes)
+{
+	DEFINE_WAIT(wait);
+	int ret = 0;
+	int got_sig = 0;
+
+	mutex_lock(&itv->udma.lock);
+	/* Map User DMA */
+	if (ivtv_udma_setup(itv, ivtv_dest_addr, userbuf, size_in_bytes) <= 0) {
+		mutex_unlock(&itv->udma.lock);
+		IVTV_FB_WARN("ivtvfb_prep_dec_dma_to_device, "
+			       "Error with get_user_pages: %d bytes, %d pages returned\n",
+			       size_in_bytes, itv->udma.page_count);
+
+		/* get_user_pages must have failed completely */
+		return -EIO;
+	}
+
+	IVTV_FB_DEBUG_INFO("ivtvfb_prep_dec_dma_to_device, %d bytes, %d pages\n",
+		       size_in_bytes, itv->udma.page_count);
+
+	ivtv_udma_prepare(itv);
+	prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
+	/* if no UDMA is pending and no UDMA is in progress, then the DMA
+	   is finished */
+	while (itv->i_flags & (IVTV_F_I_UDMA_PENDING | IVTV_F_I_UDMA)) {
+		/* don't interrupt if the DMA is in progress but break off
+		   a still pending DMA. */
+		got_sig = signal_pending(current);
+		if (got_sig && test_and_clear_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags))
+			break;
+		got_sig = 0;
+		schedule();
+	}
+	finish_wait(&itv->dma_waitq, &wait);
+
+	/* Unmap Last DMA Xfer */
+	ivtv_udma_unmap(itv);
+	mutex_unlock(&itv->udma.lock);
+	if (got_sig) {
+		IVTV_DEBUG_INFO("User stopped OSD\n");
+		return -EINTR;
+	}
+
+	return ret;
+}
+
+static int ivtv_fb_prep_frame(struct ivtv *itv, int cmd, void __user *source, unsigned long dest_offset, int count)
+{
+	DEFINE_WAIT(wait);
+
+	/* Nothing to do */
+	if (count == 0) {
+		IVTV_FB_DEBUG_WARN("ivtv_fb_prep_frame: Nothing to do. count = 0\n");
+		return -EINVAL;
+	}
+
+	/* Check Total FB Size */
+	if ((dest_offset + count) > itv->osd_info->video_buffer_size) {
+		IVTV_FB_WARN(
+			"ivtv_fb_prep_frame: Overflowing the framebuffer %ld, "
+			"only %d available\n",
+			(dest_offset + count), itv->osd_info->video_buffer_size);
+		return -E2BIG;
+	}
+
+	/* Not fatal, but will have undesirable results */
+	if ((unsigned long)source & 3)
+		IVTV_FB_WARN ("ivtv_fb_prep_frame: Source address not 32 bit aligned (0x%08lx)\n",(unsigned long)source);
+
+	if (dest_offset & 3)
+		IVTV_FB_WARN ("ivtv_fb_prep_frame: Dest offset not 32 bit aligned (%ld)\n",dest_offset);
+
+	if (count & 3)
+		IVTV_FB_WARN ("ivtv_fb_prep_frame: Count not a multiple of 4 (%d)\n",count);
+
+	/* Check Source */
+	if (!access_ok(VERIFY_READ, source + dest_offset, count)) {
+		IVTV_FB_WARN(
+			"Invalid userspace pointer!!! 0x%08lx\n",
+			(unsigned long)source);
+
+		IVTV_FB_DEBUG_WARN(
+			"access_ok() failed for offset 0x%08lx source 0x%08lx count %d\n",
+			dest_offset, (unsigned long)source,
+			count);
+		return -EINVAL;
+	}
+
+	/* OSD Address to send DMA to */
+	dest_offset += IVTV_DEC_MEM_START + itv->osd_info->video_rbase;
+
+	/* Fill Buffers */
+	return ivtv_fb_prep_dec_dma_to_device(itv, dest_offset, source, count);
+}
+
+static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+{
+	DEFINE_WAIT(wait);
+	struct ivtv *itv = (struct ivtv *)info->par;
+	int rc=0;
+
+	switch (cmd) {
+
+		case FBIOGET_VBLANK: {
+			struct fb_vblank vblank;
+			u32 trace;
+
+			vblank.flags = FB_VBLANK_HAVE_COUNT |FB_VBLANK_HAVE_VCOUNT |
+					FB_VBLANK_HAVE_VSYNC;
+			trace = read_reg (0x028c0) >> 16;
+			if (itv->is_50hz && trace > 312) trace -= 312;
+			else if (itv->is_60hz && trace > 262) trace -= 262;
+			if (trace == 1) vblank.flags |= FB_VBLANK_VSYNCING;
+			vblank.count = itv->lastVsyncFrame;
+			vblank.vcount = trace;
+			vblank.hcount = 0;
+			if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank)))
+				return -EFAULT;
+			return 0;
+		}
+
+		case FBIO_WAITFORVSYNC: {
+			prepare_to_wait(&itv->vsync_waitq, &wait, TASK_INTERRUPTIBLE);
+			if (!schedule_timeout(HZ/20)) rc = -ETIMEDOUT;
+			finish_wait (&itv->vsync_waitq, &wait);
+			return rc;
+		}
+
+		case IVTVFB_IOCTL_PREP_FRAME: {
+			struct ivtvfb_ioctl_dma_host_to_ivtv_args args;
+
+			IVTV_FB_DEBUG_INFO("IVTVFB_IOCTL_PREP_FRAME\n");
+			if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
+				return -EFAULT;
+
+			return ivtv_fb_prep_frame(itv, cmd, args.source, args.dest_offset, args.count);
+		}
+
+		default:
+			IVTV_FB_ERR("Unknown IOCTL %d\n",cmd);
+			return -EINVAL;
+	}
+	return 0;
+}
+
+/* Framebuffer device handling */
+
+static int ivtvfb_set_var(struct ivtv *itv, struct fb_var_screeninfo *var)
+{
+
+	struct ivtv_osd_coords ivtv_osd;
+	struct v4l2_rect ivtv_window;
+
+	IVTV_FB_DEBUG_INFO("ivtvfb_set_var\n");
+
+	/* Select color space */
+	if (var->nonstd) /* YUV */
+		write_reg (read_reg(0x02a00) | 0x0002000,0x02a00);
+	else /* RGB  */
+		write_reg (read_reg(0x02a00) & ~0x0002000,0x02a00);
+
+	/* Set the color mode
+	   Although rare, occasionally things go wrong. The extra mode
+	   change seems to help... */
+
+	switch (var->bits_per_pixel) {
+		case 8:
+			ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
+			ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, IVTV_OSD_BPP_8);
+			break;
+		case 32:
+			ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
+			ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, IVTV_OSD_BPP_32);
+			break;
+		case 16:
+			switch (var->green.length) {
+			case 4:
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, IVTV_OSD_BPP_16_444);
+				break;
+			case 5:
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, IVTV_OSD_BPP_16_555);
+				break;
+			case 6:
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, 0);
+				ivtv_vapi(itv, CX2341X_OSD_SET_PIXEL_FORMAT, 1, IVTV_OSD_BPP_16_565);
+				break;
+			default:
+				IVTV_FB_DEBUG_WARN("ivtvfb_set_var - Invalid bpp\n");
+			}
+			break;
+		default:
+			IVTV_FB_DEBUG_WARN("ivtvfb_set_var - Invalid bpp\n");
+	}
+
+	itv->osd_info->bits_per_pixel = var->bits_per_pixel;
+	itv->osd_info->bytes_per_pixel = var->bits_per_pixel / 8;
+
+	/* Set the flicker filter */
+	switch (var->vmode & FB_VMODE_MASK) {
+		case FB_VMODE_NONINTERLACED: /* Filter on */
+			ivtv_vapi(itv, CX2341X_OSD_SET_FLICKER_STATE, 1, 1);
+			break;
+		case FB_VMODE_INTERLACED: /* Filter off */
+			ivtv_vapi(itv, CX2341X_OSD_SET_FLICKER_STATE, 1, 0);
+			break;
+		default:
+			IVTV_FB_DEBUG_WARN("ivtvfb_set_var - Invalid video mode\n");
+	}
+
+	/* Read the current osd info */
+	ivtv_fb_get_osd_coords(itv, &ivtv_osd);
+
+	/* Now set the OSD to the size we want */
+	ivtv_osd.pixel_stride = var->xres_virtual;
+	ivtv_osd.lines = var->yres_virtual;
+	ivtv_osd.x = 0;
+	ivtv_osd.y = 0;
+	ivtv_fb_set_osd_coords(itv, &ivtv_osd);
+
+	/* Can't seem to find the right API combo for this.
+	   Use another function which does what we need through direct register access. */
+	ivtv_window.width = var->xres;
+	ivtv_window.height = var->yres;
+
+	/* Minimum margin cannot be 0, as X won't allow such a mode */
+	if (!var->upper_margin) var->upper_margin ++;
+	if (!var->left_margin) var->left_margin ++;
+	ivtv_window.top = var->upper_margin - 1;
+	ivtv_window.left = var->left_margin - 1;
+
+	ivtv_fb_set_display_window(itv, &ivtv_window);
+
+	/* Force update of yuv registers */
+	itv->yuv_info.yuv_forced_update = 1;
+
+	IVTV_FB_INFO("=== Display mode change ===\n");
+	IVTV_FB_INFO("Display size %dx%d (%dx%d Virtual) @ %dbpp\n",
+		var->xres,
+		var->yres,
+		var->xres_virtual,
+		var->yres_virtual,
+		var->bits_per_pixel);
+
+	IVTV_FB_INFO("Display position %d,%d\n",
+		var->left_margin,
+		var->upper_margin);
+
+	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED) {
+		IVTV_FB_INFO("Display filter : on\n");
+	}
+	else {
+		IVTV_FB_INFO("Display filter : off\n");
+	}
+
+	if (var->nonstd) {
+		IVTV_FB_INFO("Color space : YUV\n");
+	}
+	else {
+		IVTV_FB_INFO("Color space : RGB\n");
+	}
+
+	return 0;
+}
+
+static int ivtvfb_get_fix(struct ivtv *itv, struct fb_fix_screeninfo *fix)
+{
+	IVTV_FB_DEBUG_INFO ("ivtvfb_get_fix\n");
+	memset(fix, 0, sizeof(struct fb_fix_screeninfo));
+	strcpy(fix->id, "cx23415 TV out");
+	fix->smem_start = itv->osd_info->video_pbase;
+	fix->smem_len = itv->osd_info->video_buffer_size;
+	fix->type = FB_TYPE_PACKED_PIXELS;
+	fix->visual = (itv->osd_info->bits_per_pixel == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
+	fix->xpanstep = 1;
+	fix->ypanstep = 1;
+	fix->ywrapstep = 0;
+	fix->line_length = itv->osd_info->display_byte_stride;
+	fix->accel = FB_ACCEL_NONE;
+	return 0;
+}
+
+/* Check the requested display mode, returning -EINVAL if we can't
+   handle it. */
+
+static int _ivtvfb_check_var(struct fb_var_screeninfo *var, struct ivtv *itv)
+{
+	int osd_height_limit = itv->is_50hz ? 576 : 480;
+
+	IVTV_FB_DEBUG_INFO ("ivtvfb_check_var\n");
+
+	/* Check the bits per pixel */
+	if (osd_compat) {
+		if (var->bits_per_pixel != 32) {
+			IVTV_FB_DEBUG_WARN ("Invalid colour mode: %d\n",var->bits_per_pixel);
+			return -EINVAL;
+		}
+	}
+
+	if (var->bits_per_pixel == 8 || var->bits_per_pixel == 32) {
+		var->transp.offset = 24;
+		var->transp.length = 8;
+		var->red.offset = 16;
+		var->red.length = 8;
+		var->green.offset = 8;
+		var->green.length = 8;
+		var->blue.offset = 0;
+		var->blue.length = 8;
+	}
+	else if (var->bits_per_pixel == 16) {
+		/* To find out the true mode, check green length */
+		switch (var->green.length) {
+			case 4:
+				var->transp.offset = 0;
+				var->transp.length = 0;
+				var->red.offset = 8;
+				var->red.length = 4;
+				var->green.offset = 4;
+				var->green.length = 4;
+				var->blue.offset = 0;
+				var->blue.length = 4;
+				break;
+			case 5:
+				var->transp.offset = 0;
+				var->transp.length = 0;
+				var->red.offset = 10;
+				var->red.length = 5;
+				var->green.offset = 5;
+				var->green.length = 5;
+				var->blue.offset = 0;
+				var->blue.length = 5;
+				break;
+			default:
+				var->transp.offset = 0;
+				var->transp.length = 0;
+				var->red.offset = 11;
+				var->red.length = 5;
+				var->green.offset = 5;
+				var->green.length = 6;
+				var->blue.offset = 0;
+				var->blue.length = 5;
+				break;
+		}
+	}
+	else {
+		IVTV_FB_DEBUG_WARN ("Invalid colour mode: %d\n",var->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	/* Check the resolution */
+	if (osd_compat) {
+		if (var->xres != itv->osd_info->ivtvfb_defined.xres || var->yres != itv->osd_info->ivtvfb_defined.yres ||
+		    var->xres_virtual !=  itv->osd_info->ivtvfb_defined.xres_virtual || var->yres_virtual !=
+		    itv->osd_info->ivtvfb_defined.yres_virtual) {
+			IVTV_FB_DEBUG_WARN ("Invalid resolution: %d x %d (%d x %d Virtual)\n",
+				var->xres,var->yres, var->xres_virtual,var->yres_virtual);
+			return -EINVAL;
+		}
+	}
+	else {
+		if (var->xres > IVTV_OSD_MAX_WIDTH || var->yres > osd_height_limit ) {
+			IVTV_FB_DEBUG_WARN ("Invalid resolution: %d x %d\n",
+					var->xres,var->yres);
+			return -EINVAL;
+		}
+
+		/* Max horizontal size is 1023 @ 32bpp, 2046 & 16bpp, 4092 @ 8bpp */
+		if (var->xres_virtual > 4095 / (var->bits_per_pixel / 8) ||
+		    var->xres_virtual * var->yres_virtual * (var->bits_per_pixel/8) > itv->osd_info->video_buffer_size ||
+		    var->xres_virtual < var->xres ||
+		    var->yres_virtual < var->yres) {
+			IVTV_FB_DEBUG_WARN ("Invalid virtual resolution: %d x %d\n",
+				var->xres_virtual, var->yres_virtual);
+			return -EINVAL;
+		}
+	}
+
+	/* Some extra checks if in 8 bit mode */
+	if (var->bits_per_pixel == 8) {
+		/* Width must be a multiple of 4 */
+		if (var->xres & 3) {
+			IVTV_FB_DEBUG_WARN ("Invalid resolution for 8bpp: %d\n", var->xres);
+			return -EINVAL;
+		}
+		if (var->xres_virtual & 3) {
+			IVTV_FB_DEBUG_WARN ("Invalid virtual resolution for 8bpp: %d)\n", var->xres_virtual);
+			return -EINVAL;
+		}
+	}
+	else if (var->bits_per_pixel == 16) {
+		/* Width must be a multiple of 2 */
+		if (var->xres & 1) {
+			IVTV_FB_DEBUG_WARN ("Invalid resolution for 16bpp: %d\n", var->xres);
+			return -EINVAL;
+		}
+		if (var->xres_virtual & 1) {
+			IVTV_FB_DEBUG_WARN ("Invalid virtual resolution for 16bpp: %d)\n", var->xres_virtual);
+			return -EINVAL;
+		}
+	}
+
+	/* Now check the offsets */
+	if (var->xoffset >= var->xres_virtual || var->yoffset >= var->yres_virtual) {
+		IVTV_FB_DEBUG_WARN ("Invalid offset: %d (%d) %d (%d)\n",var->xoffset,var->xres_virtual,
+					var->yoffset,var->yres_virtual);
+		return -EINVAL;
+	}
+
+	/* Check pixel format */
+	if (var->nonstd > 1) {
+		IVTV_FB_DEBUG_WARN ("Invalid nonstd % d\n",var->nonstd);
+		return -EINVAL;
+	}
+
+	/* Check video mode */
+	if (((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) &&
+		((var->vmode & FB_VMODE_MASK) != FB_VMODE_INTERLACED)) {
+		IVTV_FB_DEBUG_WARN ("Invalid video mode: %d\n",var->vmode & FB_VMODE_MASK);
+		return -EINVAL;
+	}
+
+	/* Check the left & upper margins
+	   If the margins are too large, just center the screen
+	   (enforcing margins causes too many problems) */
+
+	if (var->left_margin + var->xres > IVTV_OSD_MAX_WIDTH + 1) {
+		var->left_margin = 1 + ((IVTV_OSD_MAX_WIDTH - var->xres) / 2);
+	}
+	if (var->upper_margin + var->yres > (itv->is_50hz ? 577 : 481)) {
+		var->upper_margin = 1 + (((itv->is_50hz ? 576 : 480) - var->yres) / 2);
+	}
+
+	/* Maintain overall 'size' for a constant refresh rate */
+	var->right_margin = itv->osd_info->hlimit - var->left_margin - var->xres;
+	var->lower_margin = itv->osd_info->vlimit - var->upper_margin - var->yres;
+
+	/* Fixed sync times */
+	var->hsync_len = 24;
+	var->vsync_len = 2;
+
+	/* Non-interlaced / interlaced mode is used to switch the OSD filter
+	   on or off. Adjust the clock timings to maintain a constant
+	   vertical refresh rate. */
+	var->pixclock = itv->osd_info->pixclock;
+	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED)
+		var->pixclock /= 2;
+
+	IVTV_FB_DEBUG_INFO ("ivtvfb_check_var - Parameters validated\n");
+
+	IVTV_FB_INFO("=== Validated display mode  ===\n");
+	IVTV_FB_INFO("Display size %dx%d (%dx%d Virtual) @ %dbpp\n",
+		      var->xres,
+		      var->yres,
+		      var->xres_virtual,
+		      var->yres_virtual,
+		      var->bits_per_pixel);
+
+	IVTV_FB_INFO("Display position %d,%d\n",
+		      var->left_margin,
+		      var->upper_margin);
+
+	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_NONINTERLACED) {
+		IVTV_FB_INFO("Display filter : on\n");
+	}
+	else {
+		IVTV_FB_INFO("Display filter : off\n");
+	}
+
+	if (var->nonstd) {
+		IVTV_FB_INFO("Color space : YUV\n");
+	}
+	else {
+		IVTV_FB_INFO("Color space : RGB\n");
+	}
+	return 0;
+}
+
+static int ivtvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct ivtv *itv = (struct ivtv *) info->par;
+	IVTV_FB_DEBUG_INFO ("ivtvfb_check_var\n");
+	return _ivtvfb_check_var (var,itv);
+}
+
+static int ivtvfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	u32 osd_pan_index;
+	struct ivtv *itv = (struct ivtv *) info->par;
+
+	osd_pan_index = (var->xoffset + (var->yoffset * var->xres_virtual))*var->bits_per_pixel/8;
+	write_reg (osd_pan_index,0x02A0C);
+
+	/* Pass this info back the yuv handler */
+	itv->yuv_info.osd_x_pan = var->xoffset;
+	itv->yuv_info.osd_y_pan = var->yoffset;
+	/* Force update of yuv registers */
+	itv->yuv_info.yuv_forced_update = 1;
+	return 0;
+}
+
+static int ivtvfb_set_par(struct fb_info *info)
+{
+	int rc = 0;
+	struct ivtv *itv = (struct ivtv *) info->par;
+
+	IVTV_FB_DEBUG_INFO ("ivtvfb_set_par\n");
+
+	rc = ivtvfb_set_var(itv, &info->var);
+	ivtvfb_pan_display(&info->var, info);
+	ivtvfb_get_fix (itv, &info->fix);
+	return rc;
+}
+
+static int ivtvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+				unsigned blue, unsigned transp,
+				struct fb_info *info)
+{
+	u32 color, *palette;
+	struct ivtv *itv = (struct ivtv *) info->par;
+
+	if (regno >= info->cmap.len)
+		return -EINVAL;
+
+	color = ((transp & 0xFF00) << 16) |((red & 0xFF00) << 8) | (green & 0xFF00) | ((blue & 0xFF00) >> 8);
+	if (info->var.bits_per_pixel <= 8) {
+		write_reg(regno, 0x02a30);
+		write_reg(color, 0x02a34);
+	}
+	else {
+		if (regno >= 16)
+			return -EINVAL;
+
+		palette = info->pseudo_palette;
+		if (info->var.bits_per_pixel == 16) {
+			switch (info->var.green.length) {
+				case 4:
+					color = ((red & 0xf000) >> 4) |
+						((green & 0xf000) >> 8) |
+						((blue & 0xf000) >> 12);
+					break;
+				case 5:
+					color = ((red & 0xf800) >> 1) |
+						((green & 0xf800) >> 6) |
+						((blue & 0xf800) >> 11);
+					break;
+				case 6:
+					color = (red & 0xf800 ) |
+						((green & 0xfc00) >> 5) |
+						((blue & 0xf800) >> 11);
+					break;
+			}
+		}
+		palette[regno] = color;
+	}
+
+	return 0;
+}
+
+/* We don't really support blanking. All this does is enable or
+   disable the OSD. */
+static int ivtvfb_blank(int blank_mode, struct fb_info *info)
+{
+	struct ivtv *itv = (struct ivtv *)info->par;
+
+	IVTV_FB_DEBUG_INFO ("Set blanking mode : %d\n",blank_mode);
+	switch (blank_mode) {
+	case FB_BLANK_UNBLANK:
+		ivtv_vapi(itv, CX2341X_OSD_SET_STATE, 1, 1);
+		break;
+	case FB_BLANK_NORMAL:
+	case FB_BLANK_HSYNC_SUSPEND:
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_POWERDOWN:
+		ivtv_vapi(itv, CX2341X_OSD_SET_STATE, 1, 0);
+		break;
+	}
+	return 0;
+}
+
+static struct fb_ops ivtvfb_ops = {
+	.owner = THIS_MODULE,
+	.fb_check_var   = ivtvfb_check_var,
+	.fb_set_par     = ivtvfb_set_par,
+	.fb_setcolreg   = ivtvfb_setcolreg,
+	.fb_fillrect    = cfb_fillrect,
+	.fb_copyarea    = cfb_copyarea,
+	.fb_imageblit   = cfb_imageblit,
+	.fb_cursor      = NULL,
+	.fb_ioctl       = ivtvfb_ioctl,
+	.fb_pan_display = ivtvfb_pan_display,
+	.fb_blank       = ivtvfb_blank,
+};
+
+/* Initialization */
+
+
+/* Setup our initial video mode */
+static int ivtvfb_init_vidmode(struct ivtv *itv)
+{
+	int max_height;
+	struct v4l2_rect start_window;
+
+	/* Set base references for mode calcs. */
+	if (itv->is_50hz) {
+		itv->osd_info->pixclock = 84316;
+		itv->osd_info->hlimit = 776;
+		itv->osd_info->vlimit = 591;
+	}
+	else {
+		itv->osd_info->pixclock = 83926;
+		itv->osd_info->hlimit = 776;
+		itv->osd_info->vlimit = 495;
+	}
+
+	/* Color mode */
+
+	if (osd_compat) osd_depth = 32;
+	if (osd_depth != 8 && osd_depth != 16 && osd_depth != 32) osd_depth = 8;
+	itv->osd_info->bits_per_pixel = osd_depth;
+	itv->osd_info->bytes_per_pixel = itv->osd_info->bits_per_pixel / 8;
+
+	/* Horizontal size & position */
+
+	if (osd_xres > 720) osd_xres = 720;
+
+	/* Must be a multiple of 4 for 8bpp & 2 for 16bpp */
+	if (osd_depth == 8)
+		osd_xres &= ~3;
+	else if (osd_depth == 16)
+		osd_xres &= ~1;
+
+	if (osd_xres)
+		start_window.width = osd_xres;
+	else
+		start_window.width = osd_compat ? 720: 640;
+
+	/* Check horizontal start (osd_left). */
+	if (osd_left && osd_left + start_window.width > 721) {
+		IVTV_FB_ERR ("Invalid osd_left - assuming default\n");
+		osd_left = 0;
+	}
+
+	/* Hardware coords start at 0, user coords start at 1. */
+	osd_left --;
+
+	start_window.left =
+			osd_left >= 0 ? osd_left : ((IVTV_OSD_MAX_WIDTH - start_window.width) / 2);
+
+	itv->osd_info->display_byte_stride =
+			start_window.width * itv->osd_info->bytes_per_pixel;
+
+	/* Vertical size & position */
+
+	max_height = itv->is_50hz ? 576 : 480;
+
+	if ( osd_yres > max_height) osd_yres = max_height;
+
+	if (osd_yres)
+		start_window.height = osd_yres;
+	else {
+		if (itv->is_50hz)
+			start_window.height = osd_compat ? max_height : 480;
+		else
+			start_window.height = osd_compat ? max_height : 400;
+	}
+
+	/* Check vertical start (osd_upper). */
+	if (osd_upper + start_window.height > max_height + 1) {
+		IVTV_FB_ERR ("Invalid osd_upper - assuming default\n");
+		osd_upper = 0;
+	}
+
+	/* Hardware coords start at 0, user coords start at 1. */
+	osd_upper --;
+
+	start_window.top = osd_upper >= 0 ? osd_upper : ((max_height - start_window.height) / 2);
+
+	itv->osd_info->display_width = start_window.width;
+	itv->osd_info->display_height = start_window.height;
+
+	/* Generate a valid fb_var_screeninfo */
+
+	itv->osd_info->ivtvfb_defined.xres = itv->osd_info->display_width;
+	itv->osd_info->ivtvfb_defined.yres = itv->osd_info->display_height;
+	itv->osd_info->ivtvfb_defined.xres_virtual = itv->osd_info->display_width;
+	itv->osd_info->ivtvfb_defined.yres_virtual = itv->osd_info->display_height;
+	itv->osd_info->ivtvfb_defined.bits_per_pixel = itv->osd_info->bits_per_pixel;
+	itv->osd_info->ivtvfb_defined.vmode = (osd_laced ? FB_VMODE_INTERLACED : FB_VMODE_NONINTERLACED);
+	itv->osd_info->ivtvfb_defined.left_margin = start_window.left + 1;
+	itv->osd_info->ivtvfb_defined.upper_margin = start_window.top + 1;
+	itv->osd_info->ivtvfb_defined.accel_flags = FB_ACCEL_NONE;
+	itv->osd_info->ivtvfb_defined.nonstd = 0;
+
+	/* We've filled in the most data, let the usual mode check
+	   routine fill in the rest. */
+	_ivtvfb_check_var (&itv->osd_info->ivtvfb_defined,itv);
+
+	/* Generate valid fb_fix_screeninfo */
+
+	ivtvfb_get_fix(itv,&itv->osd_info->ivtvfb_fix);
+
+	/* Generate valid fb_info */
+
+	itv->osd_info->ivtvfb_info.node = -1;
+	itv->osd_info->ivtvfb_info.flags = FBINFO_FLAG_DEFAULT;
+	itv->osd_info->ivtvfb_info.fbops = &ivtvfb_ops;
+	itv->osd_info->ivtvfb_info.par = itv;
+	itv->osd_info->ivtvfb_info.var = itv->osd_info->ivtvfb_defined;
+	itv->osd_info->ivtvfb_info.fix = itv->osd_info->ivtvfb_fix;
+	itv->osd_info->ivtvfb_info.screen_base = (u8 __iomem *)itv->osd_info->video_vbase;
+	itv->osd_info->ivtvfb_info.fbops = &ivtvfb_ops;
+
+	/* Supply some monitor specs. Bogus values will do for now */
+	itv->osd_info->ivtvfb_info.monspecs.hfmin = 8000;
+	itv->osd_info->ivtvfb_info.monspecs.hfmax = 70000;
+	itv->osd_info->ivtvfb_info.monspecs.vfmin = 10;
+	itv->osd_info->ivtvfb_info.monspecs.vfmax = 100;
+
+	/* Allocate color map */
+	if (fb_alloc_cmap(&itv->osd_info->ivtvfb_info.cmap, 256, 1)) {
+		IVTV_FB_ERR ("abort, unable to alloc cmap\n");
+		return -ENOMEM;
+	}
+
+	/* Allocate the pseudo palette */
+	itv->osd_info->ivtvfb_info.pseudo_palette = kmalloc(sizeof (u32) * 16, GFP_KERNEL);
+
+	if (!itv->osd_info->ivtvfb_info.pseudo_palette) {
+		IVTV_FB_ERR ("abort, unable to alloc pseudo pallete\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/* Find OSD buffer base & size. Add to mtrr. Zero osd buffer. */
+
+static int ivtvfb_init_io(struct ivtv *itv)
+{
+	ivtv_fb_get_framebuffer(itv, &itv->osd_info->video_rbase, &itv->osd_info->video_buffer_size);
+
+	/* The osd buffer size depends on the number of video buffers allocated
+	   on the PVR350 itself. For now we'll hardcode the smallest osd buffer
+	   size to prevent any overlap. */
+	itv->osd_info->video_buffer_size = 1704960;
+
+	itv->osd_info->video_pbase = itv->base_addr + IVTV_DECODER_OFFSET + itv->osd_info->video_rbase;
+	itv->osd_info->video_vbase = itv->dec_mem + itv->osd_info->video_rbase;
+
+	if (!itv->osd_info->video_vbase) {
+		IVTV_FB_ERR("abort, video memory 0x%x @ 0x%lx isn't mapped!\n",
+		     itv->osd_info->video_buffer_size, itv->osd_info->video_pbase);
+		return -EIO;
+	}
+
+	IVTV_FB_INFO("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
+			itv->osd_info->video_pbase, itv->osd_info->video_vbase,
+			itv->osd_info->video_buffer_size / 1024);
+
+#ifdef CONFIG_MTRR
+	{
+		/* Find the largest power of two that maps the whole buffer */
+		int size_shift = 31;
+
+		while (!(itv->osd_info->video_buffer_size & (1 << size_shift))) {
+			size_shift--;
+		}
+		size_shift++;
+		itv->osd_info->fb_start_aligned_physaddr = itv->osd_info->video_pbase & ~((1 << size_shift) - 1);
+		itv->osd_info->fb_end_aligned_physaddr = itv->osd_info->video_pbase + itv->osd_info->video_buffer_size;
+		itv->osd_info->fb_end_aligned_physaddr += (1 << size_shift) - 1;
+		itv->osd_info->fb_end_aligned_physaddr &= ~((1 << size_shift) - 1);
+		if (mtrr_add(itv->osd_info->fb_start_aligned_physaddr,
+			itv->osd_info->fb_end_aligned_physaddr - itv->osd_info->fb_start_aligned_physaddr,
+			     MTRR_TYPE_WRCOMB, 1) < 0) {
+			IVTV_FB_ERR("warning: mtrr_add() failed to add write combining region 0x%08x-0x%08x\n",
+				 (unsigned int)itv->osd_info->fb_start_aligned_physaddr,
+				 (unsigned int)itv->osd_info->fb_end_aligned_physaddr);
+		}
+	}
+#endif /* CONFIG_MTRR */
+
+	/* Blank the entire osd. */
+	memset_io(itv->osd_info->video_vbase, 0, itv->osd_info->video_buffer_size);
+
+	return 0;
+}
+
+/* Release any memory we've grabbed & remove mtrr entry */
+static void ivtvfb_release_buffers (struct ivtv *itv)
+{
+	/* Release cmap */
+	if (itv->osd_info->ivtvfb_info.cmap.len);
+	fb_dealloc_cmap(&itv->osd_info->ivtvfb_info.cmap);
+
+	/* Release pseudo palette */
+	if (itv->osd_info->ivtvfb_info.pseudo_palette)
+		kfree(itv->osd_info->ivtvfb_info.pseudo_palette);
+
+#ifdef CONFIG_MTRR
+	mtrr_del(-1, itv->osd_info->fb_start_aligned_physaddr,
+		  (itv->osd_info->fb_end_aligned_physaddr - itv->osd_info->fb_start_aligned_physaddr));
+#endif /* CONFIG_MTRR */
+
+	kfree(itv->osd_info);
+	itv->osd_info = NULL;
+}
+
+/* Initialize the specified card */
+
+static int ivtvfb_init_card (struct ivtv *itv)
+{
+	int rc;
+
+	if (itv->osd_info) {
+		IVTV_FB_ERR("Card %d already initialised\n", ivtv_fb_card_id);
+		return -EBUSY;
+	}
+
+	itv->osd_info = kzalloc(sizeof(struct osd_info), GFP_ATOMIC);
+	if (itv->osd_info == 0) {
+		IVTV_FB_ERR("Failed to allocate memory for osd_info\n");
+		return -ENOMEM;
+	}
+
+	/* Find & setup the OSD buffer */
+	if ((rc = ivtvfb_init_io (itv)))
+		return rc;
+
+	/* Set the startup video mode information */
+	if ((rc = ivtvfb_init_vidmode (itv))) {
+		ivtvfb_release_buffers(itv);
+		return rc;
+	}
+
+	/* Register the framebuffer */
+	if (register_framebuffer(&itv->osd_info->ivtvfb_info) < 0) {
+		ivtvfb_release_buffers(itv);
+		return -EINVAL;
+	}
+
+	itv->osd_video_pbase = itv->osd_info->video_pbase;
+
+	/* Set the card to the requested mode */
+	ivtvfb_set_par(&itv->osd_info->ivtvfb_info);
+
+	/* Set color 0 to black */
+	write_reg(0, 0x02a30);
+	write_reg(0, 0x02a34);
+
+	/* Enable the osd */
+	ivtvfb_blank(FB_BLANK_UNBLANK, &itv->osd_info->ivtvfb_info);
+
+	/* Note if we're running in compatibility mode */
+	if (osd_compat)
+		IVTV_FB_INFO("Running in compatibility mode. Display resize & mode change disabled\n");
+
+	/* Allocate DMA */
+	ivtv_udma_alloc(itv);
+	return 0;
+
+}
+
+static int __init ivtvfb_init(void)
+{
+	struct ivtv *itv;
+	int i, registered = 0;
+
+	if (ivtv_fb_card_id < -1 || ivtv_fb_card_id >= IVTV_MAX_CARDS) {
+		printk(KERN_ERR "ivtv-fb:  ivtv_fb_card_id parameter is out of range (valid range: -1 - %d)\n",
+		     IVTV_MAX_CARDS - 1);
+		return -EINVAL;
+	}
+
+	/* Locate & initialise all cards supporting an OSD. */
+	for (i = 0; i < ivtv_cards_active; i++) {
+		if (ivtv_fb_card_id != -1 && i != ivtv_fb_card_id)
+			continue;
+		itv = ivtv_cards[i];
+		if (itv && (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT)) {
+			if (ivtvfb_init_card(itv) == 0) {
+				IVTV_FB_INFO("Framebuffer registered on ivtv card id %d\n", i);
+				registered++;
+			}
+		}
+	}
+	if (!registered) {
+		printk(KERN_ERR "ivtv-fb:  no cards found");
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static void ivtvfb_cleanup(void)
+{
+	struct ivtv *itv;
+	int i;
+
+	printk(KERN_INFO "ivtv-fb:  Unloading framebuffer module\n");
+
+	for (i = 0; i < ivtv_cards_active; i++) {
+		itv = ivtv_cards[i];
+		if (itv && (itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT) && itv->osd_info) {
+			IVTV_FB_DEBUG_INFO("Unregister framebuffer %d\n", i);
+			ivtvfb_blank(FB_BLANK_POWERDOWN, &itv->osd_info->ivtvfb_info);
+			unregister_framebuffer(&itv->osd_info->ivtvfb_info);
+			ivtvfb_release_buffers(itv);
+			itv->osd_video_pbase = 0;
+		}
+	}
+}
+
+module_init(ivtvfb_init);
+module_exit(ivtvfb_cleanup);

include/media/ivtv-fb.h

+/*
+    On Screen Display cx23415 Framebuffer driver
+
+    Copyright (C) 2006  Ian Armstrong <ian@iarmst.demon.co.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _LINUX_IVTV_FB_H
+#define _LINUX_IVTV_FB_H
+
+/* Framebuffer external API */
+
+struct ivtvfb_ioctl_dma_host_to_ivtv_args {
+	void __user *source;
+	unsigned long dest_offset;
+	int count;
+};
+
+/* Framebuffer ioctls should use the range 1 - 28 */
+#define IVTVFB_IOCTL_PREP_FRAME         _IOW('@', 3, struct ivtvfb_ioctl_dma_host_to_ivtv_args)
+
+#endif