V4L/DVB (10954): Add cx231xx USB driver

Signed-off-by: Srinivasa Deevi <srinivasa.deevi@conexant.com>
[mchehab@redhat.com: Remove the Kconfig changes, to avoid git breakages]
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2440 insertions, 0 deletions

diff --git a/drivers/media/video/cx231xx/cx231xx-video.c b/drivers/media/video/cx231xx/cx231xx-video.c
new file mode 100644
index 0000000..3eb5626
--- /dev/null
+++ b/drivers/media/video/cx231xx/cx231xx-video.c
@@ -0,0 +1,2440 @@
+/*
+   cx231xx-video.c - driver for Conexant Cx23100/101/102 USB video capture devices
+
+   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+        Based on em28xx driver
+        Based on cx23885 driver
+        Based on cx88 driver
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/bitmap.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <linux/version.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/msp3400.h>
+#include <media/tuner.h>
+
+#include "dvb_frontend.h"
+
+#include "cx231xx.h"
+#include "cx231xx-vbi.h"
+
+
+#define DRIVER_AUTHOR   "Srinivasa Deevi <srinivasa.deevi@conexant.com>"
+#define DRIVER_DESC     "Conexant cx231xx based USB video device driver"
+
+
+#define cx231xx_videodbg(fmt, arg...) do {\
+	if (video_debug) \
+		printk(KERN_INFO "%s %s :"fmt, \
+			 dev->name, __func__ , ##arg); } while (0)
+
+static unsigned int isoc_debug;
+module_param(isoc_debug, int, 0644);
+MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
+
+#define cx231xx_isocdbg(fmt, arg...) \
+do {\
+	if (isoc_debug) { \
+		printk(KERN_INFO "%s %s :"fmt, \
+			 dev->name, __func__ , ##arg); \
+	} \
+  } while (0)
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+
+
+static unsigned int card[]     = {[0 ... (CX231XX_MAXBOARDS - 1)] = UNSET };
+static unsigned int video_nr[] = {[0 ... (CX231XX_MAXBOARDS - 1)] = UNSET };
+static unsigned int vbi_nr[]   = {[0 ... (CX231XX_MAXBOARDS - 1)] = UNSET };
+static unsigned int radio_nr[] = {[0 ... (CX231XX_MAXBOARDS - 1)] = UNSET };
+
+module_param_array(card,  int, NULL, 0444);
+module_param_array(video_nr, int, NULL, 0444);
+module_param_array(vbi_nr, int, NULL, 0444);
+module_param_array(radio_nr, int, NULL, 0444);
+
+MODULE_PARM_DESC(card,     "card type");
+MODULE_PARM_DESC(video_nr, "video device numbers");
+MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
+MODULE_PARM_DESC(radio_nr, "radio device numbers");
+
+static unsigned int video_debug;
+module_param(video_debug, int, 0644);
+MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
+
+
+
+/* supported video standards */
+static struct cx231xx_fmt format[] = {
+	{
+		.name     = "16bpp YUY2, 4:2:2, packed",
+		.fourcc   = V4L2_PIX_FMT_YUYV,
+		.depth    = 16,
+		.reg	  = 0,
+	},
+};
+
+
+/* supported controls */
+/* Common to all boards */
+
+/* ------------------------------------------------------------------- */
+
+static const struct v4l2_queryctrl no_ctl = {
+	.name  = "42",
+	.flags = V4L2_CTRL_FLAG_DISABLED,
+};
+
+static struct cx231xx_ctrl cx231xx_ctls[] = {
+	/* --- video --- */
+	{
+		.v = {
+			.id            = V4L2_CID_BRIGHTNESS,
+			.name          = "Brightness",
+			.minimum       = 0x00,
+			.maximum       = 0xff,
+			.step          = 1,
+			.default_value = 0x7f,
+			.type          = V4L2_CTRL_TYPE_INTEGER,
+		},
+		.off                   = 128,
+		.reg                   = LUMA_CTRL,
+		.mask                  = 0x00ff,
+		.shift                 = 0,
+	}, {
+		.v = {
+			.id            = V4L2_CID_CONTRAST,
+			.name          = "Contrast",
+			.minimum       = 0,
+			.maximum       = 0xff,
+			.step          = 1,
+			.default_value = 0x3f,
+			.type          = V4L2_CTRL_TYPE_INTEGER,
+		},
+		.off                   = 0,
+		.reg                   = LUMA_CTRL,
+		.mask                  = 0xff00,
+		.shift                 = 8,
+	}, {
+		.v = {
+			.id            = V4L2_CID_HUE,
+			.name          = "Hue",
+			.minimum       = 0,
+			.maximum       = 0xff,
+			.step          = 1,
+			.default_value = 0x7f,
+			.type          = V4L2_CTRL_TYPE_INTEGER,
+		},
+		.off                   = 128,
+		.reg                   = CHROMA_CTRL,
+		.mask                  = 0xff0000,
+		.shift                 = 16,
+	}, {
+		/* strictly, this only describes only U saturation.
+		 * V saturation is handled specially through code.
+		 */
+		.v = {
+			.id            = V4L2_CID_SATURATION,
+			.name          = "Saturation",
+			.minimum       = 0,
+			.maximum       = 0xff,
+			.step          = 1,
+			.default_value = 0x7f,
+			.type          = V4L2_CTRL_TYPE_INTEGER,
+		},
+		.off                   = 0,
+		.reg                   = CHROMA_CTRL,
+		.mask                  = 0x00ff,
+		.shift                 = 0,
+	}, {
+	/* --- audio --- */
+		.v = {
+			.id            = V4L2_CID_AUDIO_MUTE,
+			.name          = "Mute",
+			.minimum       = 0,
+			.maximum       = 1,
+			.default_value = 1,
+			.type          = V4L2_CTRL_TYPE_BOOLEAN,
+		},
+		.reg                   = PATH1_CTL1,
+		.mask                  = (0x1f << 24),
+		.shift                 = 24,
+	}, {
+		.v = {
+			.id            = V4L2_CID_AUDIO_VOLUME,
+			.name          = "Volume",
+			.minimum       = 0,
+			.maximum       = 0x3f,
+			.step          = 1,
+			.default_value = 0x3f,
+			.type          = V4L2_CTRL_TYPE_INTEGER,
+		},
+		.reg                   = PATH1_VOL_CTL,
+		.mask                  = 0xff,
+		.shift                 = 0,
+	}
+};
+static const int CX231XX_CTLS = ARRAY_SIZE(cx231xx_ctls);
+
+static const u32 cx231xx_user_ctrls[] = {
+	V4L2_CID_USER_CLASS,
+	V4L2_CID_BRIGHTNESS,
+	V4L2_CID_CONTRAST,
+	V4L2_CID_SATURATION,
+	V4L2_CID_HUE,
+	V4L2_CID_AUDIO_VOLUME,
+#if 0
+	V4L2_CID_AUDIO_BALANCE,
+#endif
+	V4L2_CID_AUDIO_MUTE,
+	0
+};
+
+static const u32 *ctrl_classes[] = {
+	cx231xx_user_ctrls,
+	NULL
+};
+
+
+/* ------------------------------------------------------------------
+	Video buffer and parser functions
+   ------------------------------------------------------------------*/
+
+/*
+ * Announces that a buffer were filled and request the next
+ */
+static inline void buffer_filled(struct cx231xx *dev,
+				  struct cx231xx_dmaqueue *dma_q,
+				  struct cx231xx_buffer *buf)
+{
+	/* Advice that buffer was filled */
+	cx231xx_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
+	buf->vb.state = VIDEOBUF_DONE;
+	buf->vb.field_count++;
+	do_gettimeofday(&buf->vb.ts);
+
+	dev->video_mode.isoc_ctl.buf = NULL;
+
+	list_del(&buf->vb.queue);
+	wake_up(&buf->vb.done);
+}
+
+
+static inline void print_err_status(struct cx231xx *dev,
+				     int packet, int status)
+{
+	char *errmsg = "Unknown";
+
+	switch (status) {
+	case -ENOENT:
+		errmsg = "unlinked synchronuously";
+		break;
+	case -ECONNRESET:
+		errmsg = "unlinked asynchronuously";
+		break;
+	case -ENOSR:
+		errmsg = "Buffer error (overrun)";
+		break;
+	case -EPIPE:
+		errmsg = "Stalled (device not responding)";
+		break;
+	case -EOVERFLOW:
+		errmsg = "Babble (bad cable?)";
+		break;
+	case -EPROTO:
+		errmsg = "Bit-stuff error (bad cable?)";
+		break;
+	case -EILSEQ:
+		errmsg = "CRC/Timeout (could be anything)";
+		break;
+	case -ETIME:
+		errmsg = "Device does not respond";
+		break;
+	}
+	if (packet < 0) {
+		cx231xx_isocdbg("URB status %d [%s].\n",	status, errmsg);
+	} else {
+		cx231xx_isocdbg("URB packet %d, status %d [%s].\n",
+			       packet, status, errmsg);
+	}
+}
+
+/*
+ * video-buf generic routine to get the next available buffer
+ */
+static inline void get_next_buf(struct cx231xx_dmaqueue *dma_q,
+					  struct cx231xx_buffer **buf)
+{
+    struct cx231xx_video_mode *vmode = container_of(dma_q, struct cx231xx_video_mode, vidq);
+    struct cx231xx *dev = container_of(vmode, struct cx231xx, video_mode);
+
+	char *outp;
+
+
+	if (list_empty(&dma_q->active)) {
+		cx231xx_isocdbg("No active queue to serve\n");
+		dev->video_mode.isoc_ctl.buf = NULL;
+		*buf = NULL;
+		return;
+	}
+
+	/* Get the next buffer */
+	*buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
+
+	/* Cleans up buffer - Usefull for testing for frame/URB loss */
+	outp = videobuf_to_vmalloc(&(*buf)->vb);
+	memset(outp, 0, (*buf)->vb.size);
+
+	dev->video_mode.isoc_ctl.buf = *buf;
+
+	return;
+}
+
+/*
+ * Controls the isoc copy of each urb packet
+ */
+static inline int cx231xx_isoc_copy(struct cx231xx *dev, struct urb *urb)
+{
+	struct cx231xx_buffer    *buf;
+	struct cx231xx_dmaqueue  *dma_q = urb->context;
+	unsigned char *outp = NULL;
+	int i,  rc = 1;
+	unsigned char *p_buffer;
+    u32 bytes_parsed = 0, buffer_size = 0;
+    u8 sav_eav = 0;
+
+	if (!dev)
+		return 0;
+
+	if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+		return 0;
+
+	if (urb->status < 0) {
+		print_err_status(dev, -1, urb->status);
+		if (urb->status == -ENOENT)
+			return 0;
+	}
+
+	buf = dev->video_mode.isoc_ctl.buf;
+	if (buf != NULL)
+		outp = videobuf_to_vmalloc(&buf->vb);
+
+	for (i = 0; i < urb->number_of_packets; i++) {
+		int status = urb->iso_frame_desc[i].status;
+
+		if (status < 0) {
+			print_err_status(dev, i, status);
+			if (urb->iso_frame_desc[i].status != -EPROTO)
+				continue;
+		}
+
+        if (urb->iso_frame_desc[i].actual_length <= 0) {
+			/* cx231xx_isocdbg("packet %d is empty",i); - spammy */
+			continue;
+		}
+		if (urb->iso_frame_desc[i].actual_length >
+						dev->video_mode.max_pkt_size) {
+			cx231xx_isocdbg("packet bigger than packet size");
+			continue;
+		}
+
+        /*  get buffer pointer and length */
+		p_buffer = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+        buffer_size = urb->iso_frame_desc[i].actual_length;
+        bytes_parsed = 0;
+
+        if(dma_q->is_partial_line)
+        {
+            /* Handle the case where we were working on a partial line */
+            sav_eav = dma_q->last_sav;
+        } else {
+            /* Check for a SAV/EAV overlapping the buffer boundary */
+            sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer, dma_q->partial_buf, &bytes_parsed);
+        }
+
+        sav_eav &= 0xF0;
+        /* Get the first line if we have some portion of an SAV/EAV from the last buffer
+           or a partial line  */
+        if(sav_eav) {
+            bytes_parsed += cx231xx_get_video_line(dev, dma_q,
+                sav_eav,                            /* SAV/EAV */
+                p_buffer + bytes_parsed,            /* p_buffer */
+                buffer_size - bytes_parsed);        /* buffer size */
+        }
+
+        /* Now parse data that is completely in this buffer */
+        /* dma_q->is_partial_line = 0;  */
+
+        while(bytes_parsed < buffer_size)
+        {
+            u32 bytes_used = 0;
+
+            sav_eav = cx231xx_find_next_SAV_EAV(
+                p_buffer + bytes_parsed,            /* p_buffer */
+                buffer_size - bytes_parsed,         /* buffer size */
+                &bytes_used);                       /* Receives bytes used to get SAV/EAV */
+
+	        bytes_parsed += bytes_used;
+
+            sav_eav &= 0xF0;
+            if(sav_eav && (bytes_parsed < buffer_size))
+            {
+                bytes_parsed += cx231xx_get_video_line(dev, dma_q,
+                    sav_eav,                        /* SAV/EAV */
+                    p_buffer + bytes_parsed,        /* p_buffer */
+                    buffer_size - bytes_parsed);    /* buffer size */
+            }
+        }
+
+        /* Save the last four bytes of the buffer so we can check the buffer boundary
+           condition next time */
+        memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
+        bytes_parsed = 0;
+
+	}
+	return rc;
+}
+
+u8 cx231xx_find_boundary_SAV_EAV(u8 *p_buffer, u8 *partial_buf, u32 *p_bytes_used)
+{
+    u32 bytes_used;
+    u8 boundary_bytes[8];
+    u8 sav_eav = 0;
+
+    *p_bytes_used = 0;
+
+    /* Create an array of the last 4 bytes of the last buffer and the first
+       4 bytes of the current buffer. */
+
+    memcpy(boundary_bytes, partial_buf, 4);
+    memcpy(boundary_bytes + 4, p_buffer, 4);
+
+    /* Check for the SAV/EAV in the boundary buffer */
+    sav_eav = cx231xx_find_next_SAV_EAV((u8*)&boundary_bytes, 8, &bytes_used);
+
+    if(sav_eav) {
+        /* found a boundary SAV/EAV.  Updates the bytes used to reflect
+           only those used in the new buffer */
+        *p_bytes_used = bytes_used - 4;
+    }
+
+    return sav_eav;
+}
+
+u8 cx231xx_find_next_SAV_EAV(u8 *p_buffer, u32 buffer_size, u32 *p_bytes_used)
+{
+    u32 i;
+    u8 sav_eav = 0;
+
+    /* Don't search if the buffer size is less than 4.  It causes a page fault since
+       buffer_size - 4 evaluates to a large number in that case. */
+    if(buffer_size < 4) {
+        *p_bytes_used = buffer_size;
+        return 0;
+    }
+
+    for(i = 0;i < (buffer_size - 3); i++)  {
+
+        if((p_buffer[i] == 0xFF) &&
+            (p_buffer[i+1] == 0x00) &&
+            (p_buffer[i+2] == 0x00)) {
+
+            *p_bytes_used = i+4;
+            sav_eav = p_buffer[i+3];
+            return sav_eav;
+        }
+    }
+
+    *p_bytes_used = buffer_size;
+    return 0;
+}
+
+
+
+
+u32 cx231xx_get_video_line(struct cx231xx *dev, struct cx231xx_dmaqueue  *dma_q,
+                           u8 sav_eav, u8 *p_buffer, u32 buffer_size)
+{
+    u32 bytes_copied = 0;
+    int current_field = -1;
+
+
+    switch(sav_eav) {
+        case SAV_ACTIVE_VIDEO_FIELD1:
+            /* looking for skipped line which occurred in PAL 720x480 mode. In this case,
+		       there will be no active data contained between the SAV and EAV */
+            if ( (buffer_size > 3) &&
+		         (p_buffer[0] == 0xFF) && (p_buffer[1] == 0x00) && (p_buffer[2] == 0x00) &&
+			     ( (p_buffer[3] == EAV_ACTIVE_VIDEO_FIELD1)	|| (p_buffer[3] == EAV_ACTIVE_VIDEO_FIELD2) ||
+			       (p_buffer[3] == EAV_VBLANK_FIELD1)	    || (p_buffer[3] == EAV_VBLANK_FIELD2)
+			     )
+		       )
+		    {
+		        return bytes_copied;
+		    }
+            current_field = 1;
+            break;
+
+        case SAV_ACTIVE_VIDEO_FIELD2:
+            /* looking for skipped line which occurred in PAL 720x480 mode. In this case,
+		       there will be no active data contained between the SAV and EAV */
+             if ( (buffer_size > 3) &&
+		         (p_buffer[0] == 0xFF) && (p_buffer[1] == 0x00) && (p_buffer[2] == 0x00) &&
+			     ( (p_buffer[3] == EAV_ACTIVE_VIDEO_FIELD1)	|| (p_buffer[3] == EAV_ACTIVE_VIDEO_FIELD2) ||
+			       (p_buffer[3] == EAV_VBLANK_FIELD1)	    || (p_buffer[3] == EAV_VBLANK_FIELD2)
+			     )
+		       )
+		    {
+		        return bytes_copied;
+		    }
+            current_field = 2;
+            break;
+    }
+
+    dma_q->last_sav = sav_eav;
+
+    bytes_copied = cx231xx_copy_video_line(dev, dma_q, p_buffer, buffer_size, current_field);
+
+    return bytes_copied;
+}
+
+u32 cx231xx_copy_video_line(struct cx231xx *dev, struct cx231xx_dmaqueue  *dma_q,
+                            u8 *p_line, u32 length, int field_number)
+{
+    u32 bytes_to_copy;
+    struct cx231xx_buffer *buf;
+    u32 _line_size = dev->width * 2;
+
+    if( dma_q->current_field != field_number )  {
+        cx231xx_reset_video_buffer(dev, dma_q);
+    }
+
+    /* get the buffer pointer */
+    buf = dev->video_mode.isoc_ctl.buf;
+
+     /* Remember the field number for next time */
+    dma_q->current_field = field_number;
+
+    bytes_to_copy = dma_q->bytes_left_in_line;
+    if(bytes_to_copy > length)
+        bytes_to_copy = length;
+
+
+    if(dma_q->lines_completed >= dma_q->lines_per_field) {
+        dma_q->bytes_left_in_line -= bytes_to_copy;
+        dma_q->is_partial_line = (dma_q->bytes_left_in_line == 0) ? 0 : 1;
+        return 0;
+    }
+
+    dma_q->is_partial_line = 1;
+
+    /* If we don't have a buffer, just return the number of bytes we would
+       have copied if we had a buffer. */
+    if(!buf)
+    {
+        dma_q->bytes_left_in_line -= bytes_to_copy;
+        dma_q->is_partial_line = (dma_q->bytes_left_in_line == 0) ? 0 : 1;
+        return bytes_to_copy;
+    }
+
+    /* copy the data to video buffer */
+    cx231xx_do_copy(dev, dma_q, p_line, bytes_to_copy);
+
+    dma_q->pos += bytes_to_copy;
+    dma_q->bytes_left_in_line -= bytes_to_copy;
+
+    if(dma_q->bytes_left_in_line == 0) {
+
+        dma_q->bytes_left_in_line = _line_size;
+        dma_q->lines_completed++;
+        dma_q->is_partial_line = 0;
+
+        if(cx231xx_is_buffer_done(dev, dma_q) && buf) {
+
+            buffer_filled(dev, dma_q, buf);
+
+            dma_q->pos = 0;
+            buf = NULL;
+            dma_q->lines_completed = 0;
+        }
+    }
+
+    return bytes_to_copy;
+}
+
+void cx231xx_reset_video_buffer(struct cx231xx *dev, struct cx231xx_dmaqueue  *dma_q)
+{
+    struct cx231xx_buffer *buf;
+
+    /* handle the switch from field 1 to field 2 */
+    if(dma_q->current_field == 1) {
+        if(dma_q->lines_completed >= dma_q->lines_per_field ) {
+            dma_q->field1_done = 1;
+        } else {
+            dma_q->field1_done = 0;
+        }
+    }
+
+    buf = dev->video_mode.isoc_ctl.buf;
+
+    if(buf == NULL) {
+        u8* outp = NULL;
+        /* first try to get the buffer */
+       get_next_buf(dma_q, &buf);
+
+       if(buf)
+           outp = videobuf_to_vmalloc(&buf->vb);
+
+        dma_q->pos = 0;
+        dma_q->field1_done = 0;
+        dma_q->current_field = -1;
+    }
+
+    /* reset the counters */
+    dma_q->bytes_left_in_line = dev->width << 1;
+    dma_q->lines_completed = 0;
+}
+
+int cx231xx_do_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
+                    u8 *p_buffer, u32 bytes_to_copy)
+{
+    u8 *p_out_buffer = NULL;
+    u32 current_line_bytes_copied = 0;
+    struct cx231xx_buffer *buf;
+    u32 _line_size = dev->width << 1;
+    void *startwrite;
+	int  offset, lencopy;
+
+    buf = dev->video_mode.isoc_ctl.buf;
+
+    if (buf == NULL)
+        return -1;
+
+	p_out_buffer = videobuf_to_vmalloc(&buf->vb);
+
+    current_line_bytes_copied = _line_size - dma_q->bytes_left_in_line;
+
+    /* Offset field 2 one line from the top of the buffer */
+    offset =  (dma_q->current_field == 1)? 0: _line_size;
+
+    /* Offset for field 2 */
+    startwrite = p_out_buffer + offset;
+
+    /* lines already completed in the current field */
+    startwrite += (dma_q->lines_completed * _line_size * 2);
+
+    /* bytes already completed in the current line */
+    startwrite += current_line_bytes_copied;
+
+    lencopy =  dma_q->bytes_left_in_line > bytes_to_copy ? bytes_to_copy : dma_q->bytes_left_in_line;
+
+    if( (u8*)(startwrite +lencopy) > (u8*)(p_out_buffer+ buf->vb.size) )  {
+        return 0;
+    }
+
+    /* The below copies the UYVY data straight into video buffer */
+    cx231xx_swab( (u16*)p_buffer, (u16*)startwrite, (u16)lencopy);
+
+    return 0;
+}
+
+void cx231xx_swab(u16 *from, u16 *to, u16 len)
+{
+    u16 i;
+
+    if( len <= 0)
+        return;
+
+    for(i = 0; i < len/2; i++) {
+        to[i] = (from[i] << 8) | (from[i] >> 8);
+    }
+}
+
+u8 cx231xx_is_buffer_done(struct cx231xx *dev,struct cx231xx_dmaqueue  *dma_q)
+{
+    u8 buffer_complete = 0;
+
+    /* Dual field stream */
+    buffer_complete =
+        ((dma_q->current_field == 2) &&
+        (dma_q->lines_completed >= dma_q->lines_per_field) &&
+        dma_q->field1_done);
+
+    return buffer_complete;
+}
+
+
+/* ------------------------------------------------------------------
+	Videobuf operations
+   ------------------------------------------------------------------*/
+
+static int
+buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
+{
+	struct cx231xx_fh *fh = vq->priv_data;
+	struct cx231xx        *dev = fh->dev;
+	struct v4l2_frequency f;
+
+	*size = ( fh->dev->width * fh->dev->height * dev->format->depth + 7)  >> 3;
+	if (0 == *count)
+		*count = CX231XX_DEF_BUF;
+
+	if (*count < CX231XX_MIN_BUF)
+		*count = CX231XX_MIN_BUF;
+
+	/* Ask tuner to go to analog mode */
+	memset(&f, 0, sizeof(f));
+	f.frequency = dev->ctl_freq;
+    f.type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_FREQUENCY, &f);
+
+	return 0;
+}
+
+/* This is called *without* dev->slock held; please keep it that way */
+static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
+{
+	struct cx231xx_fh     *fh  = vq->priv_data;
+	struct cx231xx        *dev = fh->dev;
+	unsigned long flags = 0;
+	if (in_interrupt())
+		BUG();
+
+	/* We used to wait for the buffer to finish here, but this didn't work
+	   because, as we were keeping the state as VIDEOBUF_QUEUED,
+	   videobuf_queue_cancel marked it as finished for us.
+	   (Also, it could wedge forever if the hardware was misconfigured.)
+
+	   This should be safe; by the time we get here, the buffer isn't
+	   queued anymore. If we ever start marking the buffers as
+	   VIDEOBUF_ACTIVE, it won't be, though.
+	*/
+	spin_lock_irqsave(&dev->video_mode.slock, flags);
+	if (dev->video_mode.isoc_ctl.buf == buf)
+		dev->video_mode.isoc_ctl.buf = NULL;
+	spin_unlock_irqrestore(&dev->video_mode.slock, flags);
+
+	videobuf_vmalloc_free(&buf->vb);
+	buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int
+buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+						enum v4l2_field field)
+{
+	struct cx231xx_fh     *fh  = vq->priv_data;
+	struct cx231xx_buffer *buf = container_of(vb, struct cx231xx_buffer, vb);
+	struct cx231xx        *dev = fh->dev;
+	int                  rc = 0, urb_init = 0;
+
+	/* The only currently supported format is 16 bits/pixel */
+	buf->vb.size = (fh->dev->width * fh->dev->height * dev->format->depth + 7) >> 3;
+
+	if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
+		return -EINVAL;
+
+	buf->vb.width  = dev->width;
+	buf->vb.height = dev->height;
+	buf->vb.field  = field;
+
+	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
+		rc = videobuf_iolock(vq, &buf->vb, NULL);
+		if (rc < 0)
+			goto fail;
+	}
+
+	if (!dev->video_mode.isoc_ctl.num_bufs)
+		urb_init = 1;
+
+	if (urb_init) {
+		rc = cx231xx_init_isoc(dev, CX231XX_NUM_PACKETS,
+				      CX231XX_NUM_BUFS, dev->video_mode.max_pkt_size,
+				      cx231xx_isoc_copy);
+		if (rc < 0)
+			goto fail;
+	}
+
+	buf->vb.state = VIDEOBUF_PREPARED;
+	return 0;
+
+fail:
+	free_buffer(vq, buf);
+	return rc;
+}
+
+static void
+buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+	struct cx231xx_buffer    *buf     = container_of(vb, struct cx231xx_buffer, vb);
+	struct cx231xx_fh        *fh      = vq->priv_data;
+	struct cx231xx           *dev     = fh->dev;
+	struct cx231xx_dmaqueue  *vidq    = &dev->video_mode.vidq;
+
+	buf->vb.state = VIDEOBUF_QUEUED;
+	list_add_tail(&buf->vb.queue, &vidq->active);
+
+}
+
+static void buffer_release(struct videobuf_queue *vq,
+				struct videobuf_buffer *vb)
+{
+	struct cx231xx_buffer   *buf  = container_of(vb, struct cx231xx_buffer, vb);
+	struct cx231xx_fh       *fh   = vq->priv_data;
+	struct cx231xx          *dev  = (struct cx231xx *)fh->dev;
+
+	cx231xx_isocdbg("cx231xx: called buffer_release\n");
+
+	free_buffer(vq, buf);
+}
+
+static struct videobuf_queue_ops cx231xx_video_qops = {
+	.buf_setup      = buffer_setup,
+	.buf_prepare    = buffer_prepare,
+	.buf_queue      = buffer_queue,
+	.buf_release    = buffer_release,
+};
+
+/*********************  v4l2 interface  **************************************/
+
+
+void video_mux(struct cx231xx *dev, int index)
+{
+
+	struct v4l2_routing route;
+
+	route.input = INPUT(index)->vmux;
+	route.output = 0;
+	dev->video_input = index;
+	dev->ctl_ainput = INPUT(index)->amux;
+
+    cx231xx_set_video_input_mux(dev,index);
+
+    cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_INT_S_VIDEO_ROUTING, &route);
+
+    cx231xx_set_audio_input(dev, dev->ctl_ainput );
+
+    cx231xx_info("video_mux : %d\n", index);
+
+    /* do mode control overrides if required */
+    cx231xx_do_mode_ctrl_overrides(dev);
+}
+
+/* Usage lock check functions */
+static int res_get(struct cx231xx_fh *fh)
+{
+	struct cx231xx    *dev = fh->dev;
+	int		 rc   = 0;
+
+	/* This instance already has stream_on */
+	if (fh->stream_on)
+		return rc;
+
+    if(fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+	    if (dev->stream_on)
+		    return -EBUSY;
+        dev->stream_on = 1;
+    } else if(fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+        if (dev->vbi_stream_on)
+		    return -EBUSY;
+        dev->vbi_stream_on = 1;
+    } else
+        return -EINVAL;
+
+	fh->stream_on  = 1;
+
+	return rc;
+}
+
+static int res_check(struct cx231xx_fh *fh)
+{
+	return (fh->stream_on);
+}
+
+static void res_free(struct cx231xx_fh *fh)
+{
+	struct cx231xx    *dev = fh->dev;
+
+	fh->stream_on = 0;
+
+    if(fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+        dev->stream_on = 0;
+    if(fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+	    dev->vbi_stream_on = 0;
+}
+
+static int check_dev(struct cx231xx *dev)
+{
+	if (dev->state & DEV_DISCONNECTED) {
+		cx231xx_errdev("v4l2 ioctl: device not present\n");
+		return -ENODEV;
+	}
+
+	if (dev->state & DEV_MISCONFIGURED) {
+		cx231xx_errdev("v4l2 ioctl: device is misconfigured; "
+			      "close and open it again\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+void get_scale(struct cx231xx *dev,
+			unsigned int width, unsigned int height,
+			unsigned int *hscale, unsigned int *vscale)
+{
+	unsigned int          maxw   = norm_maxw(dev);
+	unsigned int          maxh   = norm_maxh(dev);
+
+	*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
+	if (*hscale >= 0x4000)
+		*hscale = 0x3fff;
+
+	*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
+	if (*vscale >= 0x4000)
+		*vscale = 0x3fff;
+
+    dev->hscale = *hscale;
+    dev->vscale = *vscale;
+
+}
+
+/* ------------------------------------------------------------------
+	IOCTL vidioc handling
+   ------------------------------------------------------------------*/
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+	mutex_lock(&dev->lock);
+
+	f->fmt.pix.width = dev->width;
+	f->fmt.pix.height = dev->height;
+	f->fmt.pix.pixelformat = dev->format->fourcc;;
+	f->fmt.pix.bytesperline = (dev->width * dev->format->depth + 7) >> 3;;
+	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+
+	mutex_unlock(&dev->lock);
+	return 0;
+}
+
+static struct cx231xx_fmt *format_by_fourcc(unsigned int fourcc)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(format); i++)
+		if (format[i].fourcc == fourcc)
+			return &format[i];
+
+	return NULL;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+			struct v4l2_format *f)
+{
+	struct cx231xx_fh      *fh    = priv;
+	struct cx231xx         *dev   = fh->dev;
+	int                   width  = f->fmt.pix.width;
+	int                   height = f->fmt.pix.height;
+	unsigned int          maxw   = norm_maxw(dev);
+	unsigned int          maxh   = norm_maxh(dev);
+	unsigned int          hscale, vscale;
+    struct cx231xx_fmt     *fmt;
+
+	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+	if (!fmt) {
+		cx231xx_videodbg("Fourcc format (%08x) invalid.\n",
+				f->fmt.pix.pixelformat);
+		return -EINVAL;
+	}
+
+	/* width must even because of the YUYV format
+	   height must be even because of interlacing */
+	height &= 0xfffe;
+	width &= 0xfffe;
+
+	if (unlikely(height < 32))
+		height = 32;
+	if (unlikely(height > maxh))
+		height = maxh;
+	if (unlikely(width < 48))
+		width = 48;
+	if (unlikely(width > maxw))
+		width = maxw;
+
+	get_scale(dev, width, height, &hscale, &vscale);
+
+	width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
+	height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
+
+	f->fmt.pix.width = width;
+	f->fmt.pix.height = height;
+	f->fmt.pix.pixelformat = fmt->fourcc;
+	f->fmt.pix.bytesperline = (dev->width * fmt->depth + 7) >> 3;
+	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+
+	return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+			struct v4l2_format *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+    struct cx231xx_fmt     *fmt;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+
+	mutex_lock(&dev->lock);
+
+    vidioc_try_fmt_vid_cap(file, priv, f);
+
+    fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+	if (!fmt) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (videobuf_queue_is_busy(&fh->vb_vidq)) {
+		cx231xx_errdev("%s queue busy\n", __func__);
+		rc = -EBUSY;
+		goto out;
+	}
+
+	if (dev->stream_on && !fh->stream_on) {
+		cx231xx_errdev("%s device in use by another fh\n", __func__);
+		rc = -EBUSY;
+		goto out;
+	}
+
+	/* set new image size */
+	dev->width = f->fmt.pix.width;
+	dev->height = f->fmt.pix.height;
+    dev->format = fmt;
+	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
+
+    cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_S_FMT, f);
+
+    /* Set the correct alternate setting for this resolution */
+	cx231xx_resolution_set(dev);
+
+out:
+	mutex_unlock(&dev->lock);
+	return rc;
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *id)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+
+	*id = dev->norm;
+	return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id * norm)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+	struct v4l2_format f;
+	int                rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+    cx231xx_info("vidioc_s_std : 0x%x\n", (unsigned int)*norm);
+
+	mutex_lock(&dev->lock);
+	dev->norm = *norm;
+
+
+	/* Adjusts width/height, if needed */
+	f.fmt.pix.width = dev->width;
+	f.fmt.pix.height = dev->height;
+	vidioc_try_fmt_vid_cap(file, priv, &f);
+
+	/* set new image size */
+	dev->width = f.fmt.pix.width;
+	dev->height = f.fmt.pix.height;
+	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_S_STD, &dev->norm);
+
+	mutex_unlock(&dev->lock);
+
+    cx231xx_resolution_set(dev);
+
+    /* do mode control overrides */
+    cx231xx_do_mode_ctrl_overrides(dev);
+
+	return 0;
+}
+
+static const char *iname[] = {
+	[CX231XX_VMUX_COMPOSITE1] = "Composite1",
+	[CX231XX_VMUX_SVIDEO]     = "S-Video",
+	[CX231XX_VMUX_TELEVISION] = "Television",
+    [CX231XX_VMUX_CABLE]      = "Cable TV",
+    [CX231XX_VMUX_DVB]        = "DVB",
+	[CX231XX_VMUX_DEBUG]      = "for debug only",
+};
+
+static int vidioc_enum_input(struct file *file, void *priv,
+				struct v4l2_input *i)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+	unsigned int       n;
+
+	n = i->index;
+	if (n >= MAX_CX231XX_INPUT)
+		return -EINVAL;
+	if (0 == INPUT(n)->type)
+		return -EINVAL;
+
+	i->index = n;
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+
+	strcpy(i->name, iname[INPUT(n)->type]);
+
+	if ((CX231XX_VMUX_TELEVISION == INPUT(n)->type) ||
+		(CX231XX_VMUX_CABLE == INPUT(n)->type))
+		i->type = V4L2_INPUT_TYPE_TUNER;
+
+	i->std = dev->vdev->tvnorms;
+
+	return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+
+	*i = dev->video_input;
+
+	return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+	int                rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if (i >= MAX_CX231XX_INPUT)
+		return -EINVAL;
+	if (0 == INPUT(i)->type)
+		return -EINVAL;
+
+	mutex_lock(&dev->lock);
+
+	video_mux(dev, i);
+
+	mutex_unlock(&dev->lock);
+	return 0;
+}
+
+static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
+{
+	struct cx231xx_fh   *fh    = priv;
+	struct cx231xx      *dev   = fh->dev;
+
+	switch (a->index) {
+	case CX231XX_AMUX_VIDEO:
+		strcpy(a->name, "Television");
+		break;
+	case CX231XX_AMUX_LINE_IN:
+		strcpy(a->name, "Line In");
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	a->index = dev->ctl_ainput;
+	a->capability = V4L2_AUDCAP_STEREO;
+
+	return 0;
+}
+
+static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
+{
+	struct cx231xx_fh   *fh  = priv;
+	struct cx231xx      *dev = fh->dev;
+    int status = 0;
+
+
+	/* Doesn't allow manual routing */
+	if (a->index != dev->ctl_ainput)
+		return -EINVAL;
+
+	dev->ctl_ainput = INPUT(a->index)->amux;
+    status = cx231xx_set_audio_input(dev, dev->ctl_ainput);
+
+	return status;
+}
+
+static int vidioc_queryctrl(struct file *file, void *priv,
+				struct v4l2_queryctrl *qc)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   id  = qc->id;
+	int                   i;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+    qc->id = v4l2_ctrl_next(ctrl_classes, qc->id);
+	if (unlikely(qc->id == 0))
+		return -EINVAL;
+
+	memset(qc, 0, sizeof(*qc));
+
+	qc->id = id;
+
+    if (qc->id < V4L2_CID_BASE ||
+	    qc->id >= V4L2_CID_LASTP1)
+		return -EINVAL;
+
+	for (i = 0; i < CX231XX_CTLS; i++)
+		if (cx231xx_ctls[i].v.id == qc->id)
+			break;
+
+	if (i == CX231XX_CTLS) {
+		*qc = no_ctl;
+		return 0;
+	}
+	*qc = cx231xx_ctls[i].v;
+
+	mutex_lock(&dev->lock);
+    cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_QUERYCTRL, qc);
+	mutex_unlock(&dev->lock);
+
+	if (qc->type)
+		return 0;
+	else
+		return -EINVAL;
+}
+
+static int vidioc_g_ctrl(struct file *file, void *priv,
+				struct v4l2_control *ctrl)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	mutex_lock(&dev->lock);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_G_CTRL, ctrl);
+
+	mutex_unlock(&dev->lock);
+	return rc;
+}
+
+static int vidioc_s_ctrl(struct file *file, void *priv,
+				struct v4l2_control *ctrl)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	mutex_lock(&dev->lock);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_S_CTRL, ctrl);
+
+	mutex_unlock(&dev->lock);
+	return rc;
+}
+
+static int vidioc_g_tuner(struct file *file, void *priv,
+				struct v4l2_tuner *t)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if (0 != t->index)
+		return -EINVAL;
+
+	strcpy(t->name, "Tuner");
+
+    t->type       = V4L2_TUNER_ANALOG_TV;
+	t->capability = V4L2_TUNER_CAP_NORM;
+	t->rangehigh  = 0xffffffffUL;
+	t->signal     = 0xffff ; /* LOCKED */
+
+	return 0;
+}
+
+static int vidioc_s_tuner(struct file *file, void *priv,
+				struct v4l2_tuner *t)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if (0 != t->index)
+		return -EINVAL;
+#if 0
+	mutex_lock(&dev->lock);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_TUNER, t);
+
+	mutex_unlock(&dev->lock);
+#endif
+	return 0;
+}
+
+static int vidioc_g_frequency(struct file *file, void *priv,
+				struct v4l2_frequency *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+    mutex_lock(&dev->lock);
+	f->type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
+	f->frequency = dev->ctl_freq;
+
+    cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_G_FREQUENCY, f);
+
+    mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+static int vidioc_s_frequency(struct file *file, void *priv,
+				struct v4l2_frequency *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if (0 != f->tuner)
+		return -EINVAL;
+
+	if (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
+		return -EINVAL;
+	if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
+		return -EINVAL;
+
+    /* set pre channel change settings in DIF first */
+    rc = cx231xx_tuner_pre_channel_change(dev);
+
+	mutex_lock(&dev->lock);
+
+	dev->ctl_freq = f->frequency;
+
+	if(dev->tuner_type == TUNER_XC5000) {
+		if( dev->cx231xx_set_analog_freq != NULL ) {
+			dev->cx231xx_set_analog_freq(dev, f->frequency );
+		}
+	} else {
+		cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_FREQUENCY, f);
+	}
+
+	mutex_unlock(&dev->lock);
+
+    /* set post channel change settings in DIF first */
+    rc = cx231xx_tuner_post_channel_change(dev);
+
+	cx231xx_info("Set New FREQUENCY to %d\n",f->frequency);
+
+	return rc;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+
+
+/*
+  -R, --list-registers=type=<host/i2cdrv/i2caddr>,chip=<chip>[,min=<addr>,max=<addr>]
+                     dump registers from <min> to <max> [VIDIOC_DBG_G_REGISTER]
+  -r, --set-register=type=<host/i2cdrv/i2caddr>,chip=<chip>,reg=<addr>,val=<val>
+                     set the register [VIDIOC_DBG_S_REGISTER]
+
+  if type == host, then <chip> is the hosts chip ID (default 0)
+  if type == i2cdrv (default), then <chip> is the I2C driver name or ID
+  if type == i2caddr, then <chip> is the 7-bit I2C address
+*/
+
+
+static int vidioc_g_register(struct file *file, void *priv,
+			     struct v4l2_dbg_register *reg)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int ret = 0;
+    u8 value[4] ={0,0,0,0};
+    u32 data = 0;
+
+    switch (reg->match.type) {
+        case V4L2_CHIP_MATCH_HOST:
+            switch(reg->match.addr) {
+            case 0: /* Cx231xx - internal registers */
+                ret = cx231xx_read_ctrl_reg(dev,VRT_GET_REGISTER, (u16) reg->reg, value, 4);
+                reg->val = value[0] | value[1] << 8 | value[2] << 16 | value[3] << 24;
+                break;
+            case 1: /* Colibri - read byte */
+                ret = cx231xx_read_i2c_data(dev, Colibri_DEVICE_ADDRESS, (u16) reg->reg, 2, &data, 1);
+                reg->val = le32_to_cpu(data & 0xff);
+                break;
+            case 14: /* Colibri - read dword */
+                ret = cx231xx_read_i2c_data(dev, Colibri_DEVICE_ADDRESS, (u16) reg->reg, 2, &data, 4);
+                reg->val = le32_to_cpu(data);
+                break;
+            case 2: /* Hammerhead - read byte */
+                ret = cx231xx_read_i2c_data(dev, HAMMERHEAD_I2C_ADDRESS, (u16) reg->reg, 2, &data, 1);
+                reg->val = le32_to_cpu(data & 0xff);
+                break;
+            case 24: /* Hammerhead - read dword */
+                ret = cx231xx_read_i2c_data(dev, HAMMERHEAD_I2C_ADDRESS, (u16) reg->reg, 2, &data, 4);
+                reg->val = le32_to_cpu(data);
+                break;
+            case 3: /* flatiron - read byte */
+                ret = cx231xx_read_i2c_data(dev, Flatrion_DEVICE_ADDRESS, (u16) reg->reg, 1, &data, 1);
+                reg->val = le32_to_cpu(data & 0xff);
+                break;
+            case 34: /* flatiron - read dword */
+                ret = cx231xx_read_i2c_data(dev, Flatrion_DEVICE_ADDRESS, (u16) reg->reg, 1, &data, 4);
+                reg->val = le32_to_cpu(data);
+                break;
+            }
+            return ret < 0?ret:0;
+
+	    case V4L2_CHIP_MATCH_I2C_DRIVER:
+		    cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_DBG_G_REGISTER, reg);
+		    return 0;
+	    case V4L2_CHIP_MATCH_I2C_ADDR:
+		    /* Not supported yet */
+		    return -EINVAL;
+	    default:
+		    if (!v4l2_chip_match_host(&reg->match))
+			    return -EINVAL;
+	}
+
+
+    mutex_lock(&dev->lock);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_DBG_G_REGISTER, reg);
+
+    mutex_unlock(&dev->lock);
+
+	return ret;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+			     struct v4l2_dbg_register *reg)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+        int ret = 0;
+	__le64 buf;
+    u32 value;
+    u8 data[4] ={0,0,0,0};
+
+	buf = cpu_to_le64(reg->val);
+
+    switch (reg->match.type) {
+        case V4L2_CHIP_MATCH_HOST:
+            {
+                value = (u32) buf & 0xffffffff;
+
+                switch(reg->match.addr) {
+                    case 0: /* cx231xx internal registers */
+                        data[0]=(u8)value;
+                        data[1]=(u8)(value>>8);
+                        data[2]=(u8)(value>>16);
+                        data[3]=(u8)(value>>24);
+                        ret = cx231xx_write_ctrl_reg(dev,VRT_SET_REGISTER, (u16) reg->reg, data, 4);
+                        break;
+                    case 1: /* Colibri - read byte */
+                        ret = cx231xx_write_i2c_data(dev, Colibri_DEVICE_ADDRESS, (u16) reg->reg, 2, value, 1);
+                        break;
+                    case 14: /* Colibri - read dword */
+                        ret = cx231xx_write_i2c_data(dev, Colibri_DEVICE_ADDRESS, (u16) reg->reg, 2, value, 4);
+                        break;
+                    case 2: /* Hammerhead - read byte */
+                        ret = cx231xx_write_i2c_data(dev, HAMMERHEAD_I2C_ADDRESS, (u16) reg->reg, 2, value, 1);
+                        break;
+                    case 24: /* Hammerhead - read dword */
+                        ret = cx231xx_write_i2c_data(dev, HAMMERHEAD_I2C_ADDRESS, (u16) reg->reg, 2, value, 4);
+                        break;
+                    case 3: /* flatiron - read byte */
+                        ret = cx231xx_write_i2c_data(dev, Flatrion_DEVICE_ADDRESS, (u16) reg->reg, 1, value, 1);
+                        break;
+                    case 34: /* flatiron - read dword */
+                        ret = cx231xx_write_i2c_data(dev, Flatrion_DEVICE_ADDRESS, (u16) reg->reg, 1, value, 4);
+                        break;
+                }
+            }
+            return ret < 0?ret:0;
+
+        default:
+            break;
+    }
+
+	mutex_lock(&dev->lock);
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_DBG_S_REGISTER, reg);
+
+    mutex_unlock(&dev->lock);
+
+    return ret;
+}
+#endif
+
+
+static int vidioc_cropcap(struct file *file, void *priv,
+					struct v4l2_cropcap *cc)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+	if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	cc->bounds.left = 0;
+	cc->bounds.top = 0;
+	cc->bounds.width = dev->width;
+	cc->bounds.height = dev->height;
+	cc->defrect = cc->bounds;
+	cc->pixelaspect.numerator = 54;	/* 4:3 FIXME: remove magic numbers */
+	cc->pixelaspect.denominator = 59;
+
+	return 0;
+}
+
+static int vidioc_streamon(struct file *file, void *priv,
+					enum v4l2_buf_type type)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+    mutex_lock(&dev->lock);
+	rc = res_get(fh);
+
+	if (likely(rc >= 0))
+		rc = videobuf_streamon(&fh->vb_vidq);
+
+	mutex_unlock(&dev->lock);
+
+	return rc;
+}
+
+static int vidioc_streamoff(struct file *file, void *priv,
+					enum v4l2_buf_type type)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if ( (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) ||
+         (fh->type != V4L2_BUF_TYPE_VBI_CAPTURE) )
+		return -EINVAL;
+	if (type != fh->type)
+		return -EINVAL;
+
+    mutex_lock(&dev->lock);
+
+	videobuf_streamoff(&fh->vb_vidq);
+	res_free(fh);
+
+    mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+static int vidioc_querycap(struct file *file, void  *priv,
+					struct v4l2_capability *cap)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+	strlcpy(cap->driver, "cx231xx", sizeof(cap->driver));
+	strlcpy(cap->card, cx231xx_boards[dev->model].name, sizeof(cap->card));
+	strlcpy(cap->bus_info, dev_name(&dev->udev->dev), sizeof(cap->bus_info));
+
+	cap->version = CX231XX_VERSION_CODE;
+
+	cap->capabilities =
+			V4L2_CAP_VBI_CAPTURE |
+#if 0
+			V4L2_CAP_SLICED_VBI_CAPTURE |
+#endif
+			V4L2_CAP_VIDEO_CAPTURE |
+			V4L2_CAP_AUDIO |
+			V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+
+	if (dev->tuner_type != TUNER_ABSENT)
+		cap->capabilities |= V4L2_CAP_TUNER;
+
+	return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
+					struct v4l2_fmtdesc *f)
+{
+    if (unlikely(f->index >= ARRAY_SIZE(format)))
+		return -EINVAL;
+
+	strlcpy(f->description, format[f->index].name, sizeof(f->description));
+	f->pixelformat = format[f->index].fourcc;
+
+	return 0;
+}
+
+/* Sliced VBI ioctls */
+static int vidioc_g_fmt_sliced_vbi_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	mutex_lock(&dev->lock);
+
+	f->fmt.sliced.service_set = 0;
+
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_G_FMT, f);
+
+	if (f->fmt.sliced.service_set == 0)
+		rc = -EINVAL;
+
+	mutex_unlock(&dev->lock);
+	return rc;
+}
+
+static int vidioc_try_set_sliced_vbi_cap(struct file *file, void *priv,
+			struct v4l2_format *f)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	mutex_lock(&dev->lock);
+	cx231xx_i2c_call_clients(&dev->i2c_bus[0], VIDIOC_G_FMT, f);
+	mutex_unlock(&dev->lock);
+
+	if (f->fmt.sliced.service_set == 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+
+/* RAW VBI ioctls */
+
+static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+    struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+	f->fmt.vbi.sampling_rate = (dev->norm & V4L2_STD_625_50) ?
+                                35468950:28636363;
+	f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
+	f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
+	f->fmt.vbi.offset = 64 * 4;
+	f->fmt.vbi.start[0] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_START_LINE : NTSC_VBI_START_LINE;
+	f->fmt.vbi.count[0] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_LINES : NTSC_VBI_LINES;
+	f->fmt.vbi.start[1] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_START_LINE+312 : NTSC_VBI_START_LINE + 263;
+	f->fmt.vbi.count[1] = f->fmt.vbi.count[0];
+
+	return 0;
+
+}
+
+static int vidioc_try_fmt_vbi_cap(struct file *file, void *priv,
+			struct v4l2_format *f)
+{
+    struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+
+    if (dev->vbi_stream_on && !fh->stream_on) {
+		cx231xx_errdev("%s device in use by another fh\n", __func__);
+		return -EBUSY;
+	}
+
+	f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
+	f->fmt.vbi.sampling_rate = (dev->norm & V4L2_STD_625_50) ?
+                                35468950:28636363;
+	f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
+	f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
+	f->fmt.vbi.offset = 244;
+	f->fmt.vbi.flags = 0;
+	f->fmt.vbi.start[0] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_START_LINE : NTSC_VBI_START_LINE;
+	f->fmt.vbi.count[0] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_LINES : NTSC_VBI_LINES;
+	f->fmt.vbi.start[1] = (dev->norm & V4L2_STD_625_50) ?
+                               PAL_VBI_START_LINE+312 : NTSC_VBI_START_LINE + 263;
+	f->fmt.vbi.count[1] = f->fmt.vbi.count[0];
+
+	return 0;
+
+}
+
+static int vidioc_reqbufs(struct file *file, void *priv,
+			  struct v4l2_requestbuffers *rb)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	return (videobuf_reqbufs(&fh->vb_vidq, rb));
+}
+
+static int vidioc_querybuf(struct file *file, void *priv,
+			   struct v4l2_buffer *b)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	return (videobuf_querybuf(&fh->vb_vidq, b));
+}
+
+static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	return (videobuf_qbuf(&fh->vb_vidq, b));
+}
+
+static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
+{
+	struct cx231xx_fh      *fh  = priv;
+	struct cx231xx         *dev = fh->dev;
+	int                   rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	return (videobuf_dqbuf(&fh->vb_vidq, b,
+				file->f_flags & O_NONBLOCK));
+}
+
+#ifdef CONFIG_VIDEO_V4L1_COMPAT
+static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
+{
+	struct cx231xx_fh  *fh = priv;
+
+	return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
+}
+#endif
+
+
+/* ----------------------------------------------------------- */
+/* RADIO ESPECIFIC IOCTLS                                      */
+/* ----------------------------------------------------------- */
+
+static int radio_querycap(struct file *file, void  *priv,
+			  struct v4l2_capability *cap)
+{
+	struct cx231xx *dev = ((struct cx231xx_fh *)priv)->dev;
+
+	strlcpy(cap->driver, "cx231xx", sizeof(cap->driver));
+	strlcpy(cap->card, cx231xx_boards[dev->model].name, sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+
+	cap->version = CX231XX_VERSION_CODE;
+	cap->capabilities = V4L2_CAP_TUNER;
+	return 0;
+}
+
+static int radio_g_tuner(struct file *file, void *priv,
+			 struct v4l2_tuner *t)
+{
+	struct cx231xx *dev = ((struct cx231xx_fh *)priv)->dev;
+
+	if (unlikely(t->index > 0))
+		return -EINVAL;
+
+	strcpy(t->name, "Radio");
+	t->type = V4L2_TUNER_RADIO;
+
+    mutex_lock(&dev->lock);
+	cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_G_TUNER, t);
+    mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+static int radio_enum_input(struct file *file, void *priv,
+			    struct v4l2_input *i)
+{
+	if (i->index != 0)
+		return -EINVAL;
+	strcpy(i->name, "Radio");
+	i->type = V4L2_INPUT_TYPE_TUNER;
+
+	return 0;
+}
+
+static int radio_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
+{
+	if (unlikely(a->index))
+		return -EINVAL;
+
+	strcpy(a->name, "Radio");
+	return 0;
+}
+
+static int radio_s_tuner(struct file *file, void *priv,
+			 struct v4l2_tuner *t)
+{
+	struct cx231xx *dev = ((struct cx231xx_fh *)priv)->dev;
+
+	if (0 != t->index)
+		return -EINVAL;
+
+    mutex_lock(&dev->lock);
+	cx231xx_i2c_call_clients(&dev->i2c_bus[1], VIDIOC_S_TUNER, t);
+    mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+static int radio_s_audio(struct file *file, void *fh,
+			 struct v4l2_audio *a)
+{
+	return 0;
+}
+
+static int radio_s_input(struct file *file, void *fh, unsigned int i)
+{
+	return 0;
+}
+
+static int radio_queryctrl(struct file *file, void *priv,
+			   struct v4l2_queryctrl *c)
+{
+	int i;
+
+	if (c->id <  V4L2_CID_BASE ||
+		c->id >= V4L2_CID_LASTP1)
+		return -EINVAL;
+	if (c->id == V4L2_CID_AUDIO_MUTE) {
+		for (i = 0; i < CX231XX_CTLS; i++)
+			if (cx231xx_ctls[i].v.id == c->id)
+				break;
+		*c = cx231xx_ctls[i].v;
+	} else
+		*c = no_ctl;
+	return 0;
+}
+
+/*
+ * cx231xx_v4l2_open()
+ * inits the device and starts isoc transfer
+ */
+static int cx231xx_v4l2_open(struct file *filp)
+{
+    int minor = video_devdata(filp)->minor;
+	int errCode = 0, radio = 0;
+	struct cx231xx *dev = NULL;
+	struct cx231xx_fh *fh;
+	enum v4l2_buf_type fh_type = 0;
+
+    dev = cx231xx_get_device(minor, &fh_type, &radio);
+	if (NULL == dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->lock);
+
+	cx231xx_videodbg("open minor=%d type=%s users=%d\n",
+				minor, v4l2_type_names[fh_type], dev->users);
+
+#if 0
+	errCode = cx231xx_set_mode(dev, CX231XX_ANALOG_MODE);
+	if (errCode < 0) {
+		cx231xx_errdev("Device locked on digital mode. Can't open analog\n");
+		mutex_unlock(&dev->lock);
+		return -EBUSY;
+	}
+#endif
+
+	fh = kzalloc(sizeof(struct cx231xx_fh), GFP_KERNEL);
+	if (!fh) {
+		cx231xx_errdev("cx231xx-video.c: Out of memory?!\n");
+		mutex_unlock(&dev->lock);
+		return -ENOMEM;
+	}
+	fh->dev = dev;
+	fh->radio = radio;
+	fh->type = fh_type;
+	filp->private_data = fh;
+
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
+		dev->width = norm_maxw(dev);
+		dev->height = norm_maxh(dev);
+		dev->hscale = 0;
+		dev->vscale = 0;
+
+
+        /* Power up in Analog TV mode */
+        cx231xx_set_power_mode(dev, POLARIS_AVMODE_ANALOGT_TV);
+
+#if 0
+		cx231xx_set_mode(dev, CX231XX_ANALOG_MODE);
+#endif
+		cx231xx_resolution_set(dev);
+
+        /* set video alternate setting */
+        cx231xx_set_video_alternate(dev);
+
+		/* Needed, since GPIO might have disabled power of
+		   some i2c device */
+		cx231xx_config_i2c(dev);
+
+		/* device needs to be initialized before isoc transfer */
+        dev->video_input = dev->video_input > 2 ? 2: dev->video_input;
+		video_mux(dev, dev->video_input );
+
+	}
+	if (fh->radio) {
+		cx231xx_videodbg("video_open: setting radio device\n");
+
+		/* cx231xx_start_radio(dev); */
+
+		cx231xx_i2c_call_clients(&dev->i2c_bus[1], AUDC_SET_RADIO, NULL);
+	}
+
+	dev->users++;
+
+    if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+	    videobuf_queue_vmalloc_init(&fh->vb_vidq, &cx231xx_video_qops,
+			NULL, &dev->video_mode.slock, fh->type, V4L2_FIELD_INTERLACED, /* V4L2_FIELD_SEQ_TB, */
+			sizeof(struct cx231xx_buffer), fh);
+    }
+
+    if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+
+        /* Set the required alternate setting  VBI interface works in Bulk mode only */
+        cx231xx_set_alt_setting(dev, INDEX_VANC, 0);
+
+        videobuf_queue_vmalloc_init(&fh->vb_vidq, &cx231xx_vbi_qops,
+			NULL, &dev->vbi_mode.slock, fh->type, V4L2_FIELD_SEQ_TB, /* V4L2_FIELD_INTERLACED,  */
+			sizeof(struct cx231xx_buffer), fh);
+    }
+
+	mutex_unlock(&dev->lock);
+
+	return errCode;
+}
+
+/*
+ * cx231xx_realease_resources()
+ * unregisters the v4l2,i2c and usb devices
+ * called when the device gets disconected or at module unload
+*/
+void cx231xx_release_analog_resources(struct cx231xx *dev)
+{
+
+	/*FIXME: I2C IR should be disconnected */
+
+	if (dev->radio_dev) {
+		if (-1 != dev->radio_dev->minor)
+			video_unregister_device(dev->radio_dev);
+		else
+			video_device_release(dev->radio_dev);
+		dev->radio_dev = NULL;
+	}
+	if (dev->vbi_dev) {
+		cx231xx_info("V4L2 device /dev/vbi%d deregistered\n",
+			    dev->vbi_dev->num);
+		if (-1 != dev->vbi_dev->minor)
+			video_unregister_device(dev->vbi_dev);
+		else
+			video_device_release(dev->vbi_dev);
+		dev->vbi_dev = NULL;
+	}
+	if (dev->vdev) {
+		cx231xx_info("V4L2 device /dev/video%d deregistered\n",
+			    dev->vdev->num);
+		if (-1 != dev->vdev->minor)
+			video_unregister_device(dev->vdev);
+		else
+			video_device_release(dev->vdev);
+		dev->vdev = NULL;
+	}
+}
+
+/*
+ * cx231xx_v4l2_close()
+ * stops streaming and deallocates all resources allocated by the v4l2
+ * calls and ioctls
+ */
+static int cx231xx_v4l2_close(struct file *filp)
+{
+	struct cx231xx_fh *fh  = filp->private_data;
+	struct cx231xx    *dev = fh->dev;
+
+	cx231xx_videodbg("users=%d\n", dev->users);
+
+    mutex_lock(&dev->lock);
+
+	if (res_check(fh))
+		res_free(fh);
+
+    if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+		    videobuf_stop(&fh->vb_vidq);
+		    videobuf_mmap_free(&fh->vb_vidq);
+
+		    /* the device is already disconnect,
+		       free the remaining resources */
+		    if (dev->state & DEV_DISCONNECTED) {
+			    cx231xx_release_resources(dev);
+			    mutex_unlock(&dev->lock);
+			    kfree(dev);
+			    return 0;
+		    }
+
+		    /* do this before setting alternate! */
+            cx231xx_uninit_vbi_isoc(dev);
+
+            /* set alternate 0 */
+            if( !dev->vbi_or_sliced_cc_mode) {
+		        cx231xx_set_alt_setting(dev, INDEX_VANC, 0);
+            } else {
+                 cx231xx_set_alt_setting(dev, INDEX_HANC, 0);
+            }
+
+        kfree(fh);
+	    dev->users--;
+	    wake_up_interruptible_nr(&dev->open, 1);
+	    mutex_unlock(&dev->lock);
+	    return 0;
+	}
+
+	if (dev->users == 1) {
+		videobuf_stop(&fh->vb_vidq);
+		videobuf_mmap_free(&fh->vb_vidq);
+
+		/* the device is already disconnect,
+		   free the remaining resources */
+		if (dev->state & DEV_DISCONNECTED) {
+			cx231xx_release_resources(dev);
+			mutex_unlock(&dev->lock);
+			kfree(dev);
+			return 0;
+		}
+
+        /* Save some power by putting tuner to sleep */
+		cx231xx_i2c_call_clients(&dev->i2c_bus[1], TUNER_SET_STANDBY, NULL);
+
+		/* do this before setting alternate! */
+		cx231xx_uninit_isoc(dev);
+		cx231xx_set_mode(dev, CX231XX_SUSPEND);
+
+		/* set alternate 0 */
+		cx231xx_set_alt_setting(dev, INDEX_VIDEO, 0);
+	}
+	kfree(fh);
+	dev->users--;
+	wake_up_interruptible_nr(&dev->open, 1);
+	mutex_unlock(&dev->lock);
+	return 0;
+}
+
+/*
+ * cx231xx_v4l2_read()
+ * will allocate buffers when called for the first time
+ */
+static ssize_t
+cx231xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
+		 loff_t *pos)
+{
+	struct cx231xx_fh *fh = filp->private_data;
+	struct cx231xx *dev = fh->dev;
+	int rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	if ( (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) ||
+         (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)      ) {
+		mutex_lock(&dev->lock);
+		rc = res_get(fh);
+		mutex_unlock(&dev->lock);
+
+		if (unlikely(rc < 0))
+			return rc;
+
+		return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0,
+					filp->f_flags & O_NONBLOCK);
+	}
+	return 0;
+}
+
+/*
+ * cx231xx_v4l2_poll()
+ * will allocate buffers when called for the first time
+ */
+static unsigned int cx231xx_v4l2_poll(struct file *filp, poll_table * wait)
+{
+	struct cx231xx_fh *fh = filp->private_data;
+	struct cx231xx *dev = fh->dev;
+	int rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+	mutex_lock(&dev->lock);
+	rc = res_get(fh);
+	mutex_unlock(&dev->lock);
+
+	if (unlikely(rc < 0))
+		return POLLERR;
+
+	if ( (V4L2_BUF_TYPE_VIDEO_CAPTURE == fh->type) ||
+         (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) )
+         return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
+    else
+		return POLLERR;
+}
+
+/*
+ * cx231xx_v4l2_mmap()
+ */
+static int cx231xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct cx231xx_fh *fh    = filp->private_data;
+	struct cx231xx	 *dev   = fh->dev;
+	int		 rc;
+
+	rc = check_dev(dev);
+	if (rc < 0)
+		return rc;
+
+    mutex_lock(&dev->lock);
+	rc = res_get(fh);
+	mutex_unlock(&dev->lock);
+
+	if (unlikely(rc < 0))
+		return rc;
+
+	rc = videobuf_mmap_mapper(&fh->vb_vidq, vma);
+
+	cx231xx_videodbg("vma start=0x%08lx, size=%ld, ret=%d\n",
+		(unsigned long)vma->vm_start,
+		(unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
+		rc);
+
+	return rc;
+}
+
+static const struct v4l2_file_operations cx231xx_v4l_fops = {
+	.owner         = THIS_MODULE,
+	.open          = cx231xx_v4l2_open,
+	.release       = cx231xx_v4l2_close,
+	.read          = cx231xx_v4l2_read,
+	.poll          = cx231xx_v4l2_poll,
+	.mmap          = cx231xx_v4l2_mmap,
+	.ioctl	       = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops video_ioctl_ops = {
+	.vidioc_querycap            = vidioc_querycap,
+	.vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
+	.vidioc_g_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
+	.vidioc_try_fmt_vbi_cap     = vidioc_try_fmt_vbi_cap,
+	.vidioc_s_fmt_vbi_cap       = vidioc_try_fmt_vbi_cap,
+	.vidioc_g_audio             = vidioc_g_audio,
+	.vidioc_s_audio             = vidioc_s_audio,
+	.vidioc_cropcap             = vidioc_cropcap,
+	.vidioc_g_fmt_sliced_vbi_cap   = vidioc_g_fmt_sliced_vbi_cap,
+	.vidioc_try_fmt_sliced_vbi_cap = vidioc_try_set_sliced_vbi_cap,
+	.vidioc_reqbufs             = vidioc_reqbufs,
+	.vidioc_querybuf            = vidioc_querybuf,
+	.vidioc_qbuf                = vidioc_qbuf,
+	.vidioc_dqbuf               = vidioc_dqbuf,
+	.vidioc_s_std               = vidioc_s_std,
+    .vidioc_g_std               = vidioc_g_std,
+	.vidioc_enum_input          = vidioc_enum_input,
+	.vidioc_g_input             = vidioc_g_input,
+	.vidioc_s_input             = vidioc_s_input,
+	.vidioc_queryctrl           = vidioc_queryctrl,
+	.vidioc_g_ctrl              = vidioc_g_ctrl,
+	.vidioc_s_ctrl              = vidioc_s_ctrl,
+	.vidioc_streamon            = vidioc_streamon,
+	.vidioc_streamoff           = vidioc_streamoff,
+	.vidioc_g_tuner             = vidioc_g_tuner,
+	.vidioc_s_tuner             = vidioc_s_tuner,
+	.vidioc_g_frequency         = vidioc_g_frequency,
+	.vidioc_s_frequency         = vidioc_s_frequency,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_register          = vidioc_g_register,
+	.vidioc_s_register          = vidioc_s_register,
+#endif
+#ifdef CONFIG_VIDEO_V4L1_COMPAT
+	.vidiocgmbuf                = vidiocgmbuf,
+#endif
+};
+
+static struct video_device cx231xx_vbi_template;
+
+static const struct video_device cx231xx_video_template = {
+	.fops                       = &cx231xx_v4l_fops,
+	.release                    = video_device_release,
+	.ioctl_ops 		            = &video_ioctl_ops,
+	.minor                      = -1,
+	.tvnorms                    = V4L2_STD_ALL,
+	.current_norm               = V4L2_STD_PAL,
+};
+
+static const struct v4l2_file_operations radio_fops = {
+	.owner         = THIS_MODULE,
+	.open          = cx231xx_v4l2_open,
+	.release       = cx231xx_v4l2_close,
+	.ioctl	       = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops radio_ioctl_ops = {
+	.vidioc_querycap      = radio_querycap,
+	.vidioc_g_tuner       = radio_g_tuner,
+	.vidioc_enum_input    = radio_enum_input,
+	.vidioc_g_audio       = radio_g_audio,
+	.vidioc_s_tuner       = radio_s_tuner,
+	.vidioc_s_audio       = radio_s_audio,
+	.vidioc_s_input       = radio_s_input,
+	.vidioc_queryctrl     = radio_queryctrl,
+	.vidioc_g_ctrl        = vidioc_g_ctrl,
+	.vidioc_s_ctrl        = vidioc_s_ctrl,
+	.vidioc_g_frequency   = vidioc_g_frequency,
+	.vidioc_s_frequency   = vidioc_s_frequency,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_register    = vidioc_g_register,
+	.vidioc_s_register    = vidioc_s_register,
+#endif
+};
+
+static struct video_device cx231xx_radio_template = {
+	.name                 = "cx231xx-radio",
+	.fops                 = &radio_fops,
+	.ioctl_ops 	      = &radio_ioctl_ops,
+	.minor                = -1,
+};
+
+/******************************** usb interface ******************************/
+
+
+static struct video_device *cx231xx_vdev_init(struct cx231xx *dev,
+					     const struct video_device *template,
+					     const char *type_name)
+{
+	struct video_device *vfd;
+
+	vfd = video_device_alloc();
+	if (NULL == vfd)
+		return NULL;
+	*vfd = *template;
+	vfd->minor   = -1;
+	vfd->parent = &dev->udev->dev;
+	vfd->release = video_device_release;
+	vfd->debug = video_debug;
+
+	snprintf(vfd->name, sizeof(vfd->name), "%s %s",
+		 dev->name, type_name);
+
+	return vfd;
+}
+
+int cx231xx_register_analog_devices(struct cx231xx *dev)
+{
+	int ret;
+
+    cx231xx_info("%s()\n", __func__);
+
+	cx231xx_info("%s: v4l2 driver version %d.%d.%d\n",
+		dev->name,
+		(CX231XX_VERSION_CODE >> 16) & 0xff,
+		(CX231XX_VERSION_CODE >> 8) & 0xff, CX231XX_VERSION_CODE & 0xff);
+
+	/* set default norm */
+	/*dev->norm = cx231xx_video_template.current_norm;*/
+	dev->width = norm_maxw(dev);
+	dev->height = norm_maxh(dev);
+	dev->interlaced = 0;
+	dev->hscale = 0;
+	dev->vscale = 0;
+
+	/* Analog specific initialization */
+	dev->format = &format[0];
+	/* video_mux(dev, dev->video_input); */
+
+	/* Audio defaults */
+	dev->mute = 1;
+	dev->volume = 0x1f;
+
+	/* enable vbi capturing */
+    /* write code here...  */
+
+	/* allocate and fill video video_device struct */
+	dev->vdev = cx231xx_vdev_init(dev, &cx231xx_video_template, "video");
+	if (!dev->vdev) {
+		cx231xx_errdev("cannot allocate video_device.\n");
+		return -ENODEV;
+	}
+
+	/* register v4l2 video video_device */
+	ret = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
+				       video_nr[dev->devno]);
+	if (ret) {
+		cx231xx_errdev("unable to register video device (error=%i).\n", ret);
+		return ret;
+	}
+
+    cx231xx_info("%s/0: registered device video%d [v4l2]\n",
+	       dev->name, dev->vdev->num);
+
+    /* Initialize VBI template */
+	memcpy( &cx231xx_vbi_template, &cx231xx_video_template,
+		sizeof(cx231xx_vbi_template) );
+	strcpy(cx231xx_vbi_template.name,"cx231xx-vbi");
+
+
+	/* Allocate and fill vbi video_device struct */
+	dev->vbi_dev = cx231xx_vdev_init(dev, &cx231xx_vbi_template, "vbi");
+
+	/* register v4l2 vbi video_device */
+	ret = video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
+					vbi_nr[dev->devno]);
+	if (ret < 0) {
+		cx231xx_errdev("unable to register vbi device\n");
+		return ret;
+	}
+
+    cx231xx_info("%s/0: registered device vbi%d\n",
+	       dev->name, dev->vbi_dev->num);
+
+	if (cx231xx_boards[dev->model].radio.type == CX231XX_RADIO) {
+		dev->radio_dev = cx231xx_vdev_init(dev, &cx231xx_radio_template, "radio");
+		if (!dev->radio_dev) {
+			cx231xx_errdev("cannot allocate video_device.\n");
+			return -ENODEV;
+		}
+		ret = video_register_device(dev->radio_dev, VFL_TYPE_RADIO,
+					    radio_nr[dev->devno]);
+		if (ret < 0) {
+			cx231xx_errdev("can't register radio device\n");
+			return ret;
+		}
+		cx231xx_info("Registered radio device as /dev/radio%d\n",
+			    dev->radio_dev->num);
+	}
+
+	cx231xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
+				dev->vdev->num, dev->vbi_dev->num);
+
+	return 0;
+}
+
+