Initial import

1 files changed, 2614 insertions, 0 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c
new file mode 100644
index 000000000..14eba9c65
--- /dev/null
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -0,0 +1,2614 @@
+/*
+   em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
+		    video capture devices
+
+   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
+		      Markus Rechberger <mrechberger@gmail.com>
+		      Mauro Carvalho Chehab <mchehab@infradead.org>
+		      Sascha Sommer <saschasommer@freenet.de>
+   Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
+
+	Some parts based on SN9C10x PC Camera Controllers GPL driver made
+		by Luca Risolia <luca.risolia@studio.unibo.it>
+
+   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/mm.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include "em28xx.h"
+#include "em28xx-v4l.h"
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-clk.h>
+#include <media/msp3400.h>
+#include <media/tuner.h>
+
+#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
+		      "Markus Rechberger <mrechberger@gmail.com>, " \
+		      "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
+		      "Sascha Sommer <saschasommer@freenet.de>"
+
+static unsigned int isoc_debug;
+module_param(isoc_debug, int, 0644);
+MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
+
+static unsigned int disable_vbi;
+module_param(disable_vbi, int, 0644);
+MODULE_PARM_DESC(disable_vbi, "disable vbi support");
+
+static int alt;
+module_param(alt, int, 0644);
+MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
+
+#define em28xx_videodbg(fmt, arg...) do {\
+	if (video_debug) \
+		printk(KERN_INFO "%s %s :"fmt, \
+			 dev->name, __func__ , ##arg); } while (0)
+
+#define em28xx_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 " - v4l2 interface");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(EM28XX_VERSION);
+
+#define EM25XX_FRMDATAHDR_BYTE1			0x02
+#define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE	0x20
+#define EM25XX_FRMDATAHDR_BYTE2_FRAME_END	0x02
+#define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID	0x01
+#define EM25XX_FRMDATAHDR_BYTE2_MASK	(EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
+					 EM25XX_FRMDATAHDR_BYTE2_FRAME_END |   \
+					 EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)
+
+static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
+static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
+static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
+
+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(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 em28xx_fmt format[] = {
+	{
+		.name     = "16 bpp YUY2, 4:2:2, packed",
+		.fourcc   = V4L2_PIX_FMT_YUYV,
+		.depth    = 16,
+		.reg	  = EM28XX_OUTFMT_YUV422_Y0UY1V,
+	}, {
+		.name     = "16 bpp RGB 565, LE",
+		.fourcc   = V4L2_PIX_FMT_RGB565,
+		.depth    = 16,
+		.reg      = EM28XX_OUTFMT_RGB_16_656,
+	}, {
+		.name     = "8 bpp Bayer BGBG..GRGR",
+		.fourcc   = V4L2_PIX_FMT_SBGGR8,
+		.depth    = 8,
+		.reg      = EM28XX_OUTFMT_RGB_8_BGBG,
+	}, {
+		.name     = "8 bpp Bayer GRGR..BGBG",
+		.fourcc   = V4L2_PIX_FMT_SGRBG8,
+		.depth    = 8,
+		.reg      = EM28XX_OUTFMT_RGB_8_GRGR,
+	}, {
+		.name     = "8 bpp Bayer GBGB..RGRG",
+		.fourcc   = V4L2_PIX_FMT_SGBRG8,
+		.depth    = 8,
+		.reg      = EM28XX_OUTFMT_RGB_8_GBGB,
+	}, {
+		.name     = "12 bpp YUV411",
+		.fourcc   = V4L2_PIX_FMT_YUV411P,
+		.depth    = 12,
+		.reg      = EM28XX_OUTFMT_YUV411,
+	},
+};
+
+/*FIXME: maxw should be dependent of alt mode */
+static inline unsigned int norm_maxw(struct em28xx *dev)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	if (dev->board.is_webcam)
+		return v4l2->sensor_xres;
+
+	if (dev->board.max_range_640_480)
+		return 640;
+
+	return 720;
+}
+
+static inline unsigned int norm_maxh(struct em28xx *dev)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	if (dev->board.is_webcam)
+		return v4l2->sensor_yres;
+
+	if (dev->board.max_range_640_480)
+		return 480;
+
+	return (v4l2->norm & V4L2_STD_625_50) ? 576 : 480;
+}
+
+static int em28xx_vbi_supported(struct em28xx *dev)
+{
+	/* Modprobe option to manually disable */
+	if (disable_vbi == 1)
+		return 0;
+
+	if (dev->board.is_webcam)
+		return 0;
+
+	/* FIXME: check subdevices for VBI support */
+
+	if (dev->chip_id == CHIP_ID_EM2860 ||
+	    dev->chip_id == CHIP_ID_EM2883)
+		return 1;
+
+	/* Version of em28xx that does not support VBI */
+	return 0;
+}
+
+/*
+ * em28xx_wake_i2c()
+ * configure i2c attached devices
+ */
+static void em28xx_wake_i2c(struct em28xx *dev)
+{
+	struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
+
+	v4l2_device_call_all(v4l2_dev, 0, core,  reset, 0);
+	v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
+			     INPUT(dev->ctl_input)->vmux, 0, 0);
+	v4l2_device_call_all(v4l2_dev, 0, video, s_stream, 0);
+}
+
+static int em28xx_colorlevels_set_default(struct em28xx *dev)
+{
+	em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
+	em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
+	em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
+	em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
+	em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
+	em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);
+
+	em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
+	em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
+	em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
+	em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
+	em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
+	em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
+	return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
+}
+
+static int em28xx_set_outfmt(struct em28xx *dev)
+{
+	int ret;
+	u8 fmt, vinctrl;
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	fmt = v4l2->format->reg;
+	if (!dev->is_em25xx)
+		fmt |= 0x20;
+	/*
+	 * NOTE: it's not clear if this is really needed !
+	 * The datasheets say bit 5 is a reserved bit and devices seem to work
+	 * fine without it. But the Windows driver sets it for em2710/50+em28xx
+	 * devices and we've always been setting it, too.
+	 *
+	 * em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
+	 * it's likely used for an additional (compressed ?) format there.
+	 */
+	ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
+	if (ret < 0)
+		return ret;
+
+	ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, v4l2->vinmode);
+	if (ret < 0)
+		return ret;
+
+	vinctrl = v4l2->vinctl;
+	if (em28xx_vbi_supported(dev) == 1) {
+		vinctrl |= EM28XX_VINCTRL_VBI_RAW;
+		em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
+		em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH, v4l2->vbi_width/4);
+		em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, v4l2->vbi_height);
+		if (v4l2->norm & V4L2_STD_525_60) {
+			/* NTSC */
+			em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
+		} else if (v4l2->norm & V4L2_STD_625_50) {
+			/* PAL */
+			em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
+		}
+	}
+
+	return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
+}
+
+static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
+				  u8 ymin, u8 ymax)
+{
+	em28xx_videodbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
+			xmin, ymin, xmax, ymax);
+
+	em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
+	em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
+	em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
+	return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
+}
+
+static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
+				    u16 width, u16 height)
+{
+	u8 cwidth = width >> 2;
+	u8 cheight = height >> 2;
+	u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
+	/* NOTE: size limit: 2047x1023 = 2MPix */
+
+	em28xx_videodbg("capture area set to (%d,%d): %dx%d\n",
+			hstart, vstart,
+		       ((overflow & 2) << 9 | cwidth << 2),
+		       ((overflow & 1) << 10 | cheight << 2));
+
+	em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
+	em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
+	em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
+	em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
+	em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
+
+	/* FIXME: function/meaning of these registers ? */
+	/* FIXME: align width+height to multiples of 4 ?! */
+	if (dev->is_em25xx) {
+		em28xx_write_reg(dev, 0x34, width >> 4);
+		em28xx_write_reg(dev, 0x35, height >> 4);
+	}
+}
+
+static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
+{
+	u8 mode = 0x00;
+	/* the em2800 scaler only supports scaling down to 50% */
+
+	if (dev->board.is_em2800) {
+		mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
+	} else {
+		u8 buf[2];
+
+		buf[0] = h;
+		buf[1] = h >> 8;
+		em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
+
+		buf[0] = v;
+		buf[1] = v >> 8;
+		em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
+		/* it seems that both H and V scalers must be active
+		   to work correctly */
+		mode = (h || v) ? 0x30 : 0x00;
+	}
+	return em28xx_write_reg(dev, EM28XX_R26_COMPR, mode);
+}
+
+/* FIXME: this only function read values from dev */
+static int em28xx_resolution_set(struct em28xx *dev)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	int width = norm_maxw(dev);
+	int height = norm_maxh(dev);
+
+	/* Properly setup VBI */
+	v4l2->vbi_width = 720;
+	if (v4l2->norm & V4L2_STD_525_60)
+		v4l2->vbi_height = 12;
+	else
+		v4l2->vbi_height = 18;
+
+	em28xx_set_outfmt(dev);
+
+	em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
+
+	/* If we don't set the start position to 2 in VBI mode, we end up
+	   with line 20/21 being YUYV encoded instead of being in 8-bit
+	   greyscale.  The core of the issue is that line 21 (and line 23 for
+	   PAL WSS) are inside of active video region, and as a result they
+	   get the pixelformatting associated with that area.  So by cropping
+	   it out, we end up with the same format as the rest of the VBI
+	   region */
+	if (em28xx_vbi_supported(dev) == 1)
+		em28xx_capture_area_set(dev, 0, 2, width, height);
+	else
+		em28xx_capture_area_set(dev, 0, 0, width, height);
+
+	return em28xx_scaler_set(dev, v4l2->hscale, v4l2->vscale);
+}
+
+/* Set USB alternate setting for analog video */
+static int em28xx_set_alternate(struct em28xx *dev)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	int errCode;
+	int i;
+	unsigned int min_pkt_size = v4l2->width * 2 + 4;
+
+	/* NOTE: for isoc transfers, only alt settings > 0 are allowed
+		 bulk transfers seem to work only with alt=0 ! */
+	dev->alt = 0;
+	if ((alt > 0) && (alt < dev->num_alt)) {
+		em28xx_videodbg("alternate forced to %d\n", dev->alt);
+		dev->alt = alt;
+		goto set_alt;
+	}
+	if (dev->analog_xfer_bulk)
+		goto set_alt;
+
+	/* When image size is bigger than a certain value,
+	   the frame size should be increased, otherwise, only
+	   green screen will be received.
+	 */
+	if (v4l2->width * 2 * v4l2->height > 720 * 240 * 2)
+		min_pkt_size *= 2;
+
+	for (i = 0; i < dev->num_alt; i++) {
+		/* stop when the selected alt setting offers enough bandwidth */
+		if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
+			dev->alt = i;
+			break;
+		/* otherwise make sure that we end up with the maximum bandwidth
+		   because the min_pkt_size equation might be wrong...
+		*/
+		} else if (dev->alt_max_pkt_size_isoc[i] >
+			   dev->alt_max_pkt_size_isoc[dev->alt])
+			dev->alt = i;
+	}
+
+set_alt:
+	/* NOTE: for bulk transfers, we need to call usb_set_interface()
+	 * even if the previous settings were the same. Otherwise streaming
+	 * fails with all urbs having status = -EOVERFLOW ! */
+	if (dev->analog_xfer_bulk) {
+		dev->max_pkt_size = 512; /* USB 2.0 spec */
+		dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
+	} else { /* isoc */
+		em28xx_videodbg("minimum isoc packet size: %u (alt=%d)\n",
+				min_pkt_size, dev->alt);
+		dev->max_pkt_size =
+				  dev->alt_max_pkt_size_isoc[dev->alt];
+		dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
+	}
+	em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
+			dev->alt, dev->max_pkt_size);
+	errCode = usb_set_interface(dev->udev, dev->ifnum, dev->alt);
+	if (errCode < 0) {
+		em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
+			      dev->alt, errCode);
+		return errCode;
+	}
+	return 0;
+}
+
+/* ------------------------------------------------------------------
+	DMA and thread functions
+   ------------------------------------------------------------------*/
+
+/*
+ * Finish the current buffer
+ */
+static inline void finish_buffer(struct em28xx *dev,
+				 struct em28xx_buffer *buf)
+{
+	em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);
+
+	buf->vb.v4l2_buf.sequence = dev->v4l2->field_count++;
+	if (dev->v4l2->progressive)
+		buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
+	else
+		buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
+	v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
+
+	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
+}
+
+/*
+ * Copy picture data from USB buffer to videobuf buffer
+ */
+static void em28xx_copy_video(struct em28xx *dev,
+			      struct em28xx_buffer *buf,
+			      unsigned char *usb_buf,
+			      unsigned long len)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	void *fieldstart, *startwrite, *startread;
+	int  linesdone, currlinedone, offset, lencopy, remain;
+	int bytesperline = v4l2->width << 1;
+
+	if (buf->pos + len > buf->length)
+		len = buf->length - buf->pos;
+
+	startread = usb_buf;
+	remain = len;
+
+	if (v4l2->progressive || buf->top_field)
+		fieldstart = buf->vb_buf;
+	else /* interlaced mode, even nr. of lines */
+		fieldstart = buf->vb_buf + bytesperline;
+
+	linesdone = buf->pos / bytesperline;
+	currlinedone = buf->pos % bytesperline;
+
+	if (v4l2->progressive)
+		offset = linesdone * bytesperline + currlinedone;
+	else
+		offset = linesdone * bytesperline * 2 + currlinedone;
+
+	startwrite = fieldstart + offset;
+	lencopy = bytesperline - currlinedone;
+	lencopy = lencopy > remain ? remain : lencopy;
+
+	if ((char *)startwrite + lencopy > (char *)buf->vb_buf + buf->length) {
+		em28xx_isocdbg("Overflow of %zu bytes past buffer end (1)\n",
+			       ((char *)startwrite + lencopy) -
+			      ((char *)buf->vb_buf + buf->length));
+		remain = (char *)buf->vb_buf + buf->length -
+			 (char *)startwrite;
+		lencopy = remain;
+	}
+	if (lencopy <= 0)
+		return;
+	memcpy(startwrite, startread, lencopy);
+
+	remain -= lencopy;
+
+	while (remain > 0) {
+		if (v4l2->progressive)
+			startwrite += lencopy;
+		else
+			startwrite += lencopy + bytesperline;
+		startread += lencopy;
+		if (bytesperline > remain)
+			lencopy = remain;
+		else
+			lencopy = bytesperline;
+
+		if ((char *)startwrite + lencopy > (char *)buf->vb_buf +
+		    buf->length) {
+			em28xx_isocdbg("Overflow of %zu bytes past buffer end"
+				       "(2)\n",
+				       ((char *)startwrite + lencopy) -
+				       ((char *)buf->vb_buf + buf->length));
+			lencopy = remain = (char *)buf->vb_buf + buf->length -
+				(char *)startwrite;
+		}
+		if (lencopy <= 0)
+			break;
+
+		memcpy(startwrite, startread, lencopy);
+
+		remain -= lencopy;
+	}
+
+	buf->pos += len;
+}
+
+/*
+ * Copy VBI data from USB buffer to videobuf buffer
+ */
+static void em28xx_copy_vbi(struct em28xx *dev,
+			    struct em28xx_buffer *buf,
+			    unsigned char *usb_buf,
+			    unsigned long len)
+{
+	unsigned int offset;
+
+	if (buf->pos + len > buf->length)
+		len = buf->length - buf->pos;
+
+	offset = buf->pos;
+	/* Make sure the bottom field populates the second half of the frame */
+	if (buf->top_field == 0)
+		offset += dev->v4l2->vbi_width * dev->v4l2->vbi_height;
+
+	memcpy(buf->vb_buf + offset, usb_buf, len);
+	buf->pos += len;
+}
+
+static inline void print_err_status(struct em28xx *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) {
+		em28xx_isocdbg("URB status %d [%s].\n",	status, errmsg);
+	} else {
+		em28xx_isocdbg("URB packet %d, status %d [%s].\n",
+			       packet, status, errmsg);
+	}
+}
+
+/*
+ * get the next available buffer from dma queue
+ */
+static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
+						 struct em28xx_dmaqueue *dma_q)
+{
+	struct em28xx_buffer *buf;
+
+	if (list_empty(&dma_q->active)) {
+		em28xx_isocdbg("No active queue to serve\n");
+		return NULL;
+	}
+
+	/* Get the next buffer */
+	buf = list_entry(dma_q->active.next, struct em28xx_buffer, list);
+	/* Cleans up buffer - Useful for testing for frame/URB loss */
+	list_del(&buf->list);
+	buf->pos = 0;
+	buf->vb_buf = buf->mem;
+
+	return buf;
+}
+
+/*
+ * Finish the current buffer if completed and prepare for the next field
+ */
+static struct em28xx_buffer *
+finish_field_prepare_next(struct em28xx *dev,
+			  struct em28xx_buffer *buf,
+			  struct em28xx_dmaqueue *dma_q)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	if (v4l2->progressive || v4l2->top_field) { /* Brand new frame */
+		if (buf != NULL)
+			finish_buffer(dev, buf);
+		buf = get_next_buf(dev, dma_q);
+	}
+	if (buf != NULL) {
+		buf->top_field = v4l2->top_field;
+		buf->pos = 0;
+	}
+
+	return buf;
+}
+
+/*
+ * Process data packet according to the em2710/em2750/em28xx frame data format
+ */
+static inline void process_frame_data_em28xx(struct em28xx *dev,
+					     unsigned char *data_pkt,
+					     unsigned int  data_len)
+{
+	struct em28xx_v4l2      *v4l2 = dev->v4l2;
+	struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
+	struct em28xx_buffer    *vbi_buf = dev->usb_ctl.vbi_buf;
+	struct em28xx_dmaqueue  *dma_q = &dev->vidq;
+	struct em28xx_dmaqueue  *vbi_dma_q = &dev->vbiq;
+
+	/* capture type 0 = vbi start
+	   capture type 1 = vbi in progress
+	   capture type 2 = video start
+	   capture type 3 = video in progress */
+	if (data_len >= 4) {
+		/* NOTE: Headers are always 4 bytes and
+		 * never split across packets */
+		if (data_pkt[0] == 0x88 && data_pkt[1] == 0x88 &&
+		    data_pkt[2] == 0x88 && data_pkt[3] == 0x88) {
+			/* Continuation */
+			data_pkt += 4;
+			data_len -= 4;
+		} else if (data_pkt[0] == 0x33 && data_pkt[1] == 0x95) {
+			/* Field start (VBI mode) */
+			v4l2->capture_type = 0;
+			v4l2->vbi_read = 0;
+			em28xx_isocdbg("VBI START HEADER !!!\n");
+			v4l2->top_field = !(data_pkt[2] & 1);
+			data_pkt += 4;
+			data_len -= 4;
+		} else if (data_pkt[0] == 0x22 && data_pkt[1] == 0x5a) {
+			/* Field start (VBI disabled) */
+			v4l2->capture_type = 2;
+			em28xx_isocdbg("VIDEO START HEADER !!!\n");
+			v4l2->top_field = !(data_pkt[2] & 1);
+			data_pkt += 4;
+			data_len -= 4;
+		}
+	}
+	/* NOTE: With bulk transfers, intermediate data packets
+	 * have no continuation header */
+
+	if (v4l2->capture_type == 0) {
+		vbi_buf = finish_field_prepare_next(dev, vbi_buf, vbi_dma_q);
+		dev->usb_ctl.vbi_buf = vbi_buf;
+		v4l2->capture_type = 1;
+	}
+
+	if (v4l2->capture_type == 1) {
+		int vbi_size = v4l2->vbi_width * v4l2->vbi_height;
+		int vbi_data_len = ((v4l2->vbi_read + data_len) > vbi_size) ?
+				   (vbi_size - v4l2->vbi_read) : data_len;
+
+		/* Copy VBI data */
+		if (vbi_buf != NULL)
+			em28xx_copy_vbi(dev, vbi_buf, data_pkt, vbi_data_len);
+		v4l2->vbi_read += vbi_data_len;
+
+		if (vbi_data_len < data_len) {
+			/* Continue with copying video data */
+			v4l2->capture_type = 2;
+			data_pkt += vbi_data_len;
+			data_len -= vbi_data_len;
+		}
+	}
+
+	if (v4l2->capture_type == 2) {
+		buf = finish_field_prepare_next(dev, buf, dma_q);
+		dev->usb_ctl.vid_buf = buf;
+		v4l2->capture_type = 3;
+	}
+
+	if (v4l2->capture_type == 3 && buf != NULL && data_len > 0)
+		em28xx_copy_video(dev, buf, data_pkt, data_len);
+}
+
+/*
+ * Process data packet according to the em25xx/em276x/7x/8x frame data format
+ */
+static inline void process_frame_data_em25xx(struct em28xx *dev,
+					     unsigned char *data_pkt,
+					     unsigned int  data_len)
+{
+	struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
+	struct em28xx_dmaqueue  *dmaq = &dev->vidq;
+	struct em28xx_v4l2      *v4l2 = dev->v4l2;
+	bool frame_end = false;
+
+	/* Check for header */
+	/* NOTE: at least with bulk transfers, only the first packet
+	 * has a header and has always set the FRAME_END bit         */
+	if (data_len >= 2) {	/* em25xx header is only 2 bytes long */
+		if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
+		    ((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
+			v4l2->top_field = !(data_pkt[1] &
+					   EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
+			frame_end = data_pkt[1] &
+				    EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
+			data_pkt += 2;
+			data_len -= 2;
+		}
+
+		/* Finish field and prepare next (BULK only) */
+		if (dev->analog_xfer_bulk && frame_end) {
+			buf = finish_field_prepare_next(dev, buf, dmaq);
+			dev->usb_ctl.vid_buf = buf;
+		}
+		/* NOTE: in ISOC mode when a new frame starts and buf==NULL,
+		 * we COULD already prepare a buffer here to avoid skipping the
+		 * first frame.
+		 */
+	}
+
+	/* Copy data */
+	if (buf != NULL && data_len > 0)
+		em28xx_copy_video(dev, buf, data_pkt, data_len);
+
+	/* Finish frame (ISOC only) => avoids lag of 1 frame */
+	if (!dev->analog_xfer_bulk && frame_end) {
+		buf = finish_field_prepare_next(dev, buf, dmaq);
+		dev->usb_ctl.vid_buf = buf;
+	}
+
+	/* NOTE: Tested with USB bulk transfers only !
+	 * The wording in the datasheet suggests that isoc might work different.
+	 * The current code assumes that with isoc transfers each packet has a
+	 * header like with the other em28xx devices.
+	 */
+	/* NOTE: Support for interlaced mode is pure theory. It has not been
+	 * tested and it is unknown if these devices actually support it. */
+	/* NOTE: No VBI support yet (these chips likely do not support VBI). */
+}
+
+/* Processes and copies the URB data content (video and VBI data) */
+static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
+{
+	int xfer_bulk, num_packets, i;
+	unsigned char *usb_data_pkt;
+	unsigned int usb_data_len;
+
+	if (!dev)
+		return 0;
+
+	if (dev->disconnected)
+		return 0;
+
+	if (urb->status < 0)
+		print_err_status(dev, -1, urb->status);
+
+	xfer_bulk = usb_pipebulk(urb->pipe);
+
+	if (xfer_bulk) /* bulk */
+		num_packets = 1;
+	else /* isoc */
+		num_packets = urb->number_of_packets;
+
+	for (i = 0; i < num_packets; i++) {
+		if (xfer_bulk) { /* bulk */
+			usb_data_len = urb->actual_length;
+
+			usb_data_pkt = urb->transfer_buffer;
+		} else { /* isoc */
+			if (urb->iso_frame_desc[i].status < 0) {
+				print_err_status(dev, i,
+						 urb->iso_frame_desc[i].status);
+				if (urb->iso_frame_desc[i].status != -EPROTO)
+					continue;
+			}
+
+			usb_data_len = urb->iso_frame_desc[i].actual_length;
+			if (usb_data_len > dev->max_pkt_size) {
+				em28xx_isocdbg("packet bigger than packet size");
+				continue;
+			}
+
+			usb_data_pkt = urb->transfer_buffer +
+				       urb->iso_frame_desc[i].offset;
+		}
+
+		if (usb_data_len == 0) {
+			/* NOTE: happens very often with isoc transfers */
+			/* em28xx_usbdbg("packet %d is empty",i); - spammy */
+			continue;
+		}
+
+		if (dev->is_em25xx)
+			process_frame_data_em25xx(dev,
+						  usb_data_pkt, usb_data_len);
+		else
+			process_frame_data_em28xx(dev,
+						  usb_data_pkt, usb_data_len);
+
+	}
+	return 1;
+}
+
+static int get_ressource(enum v4l2_buf_type f_type)
+{
+	switch (f_type) {
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+		return EM28XX_RESOURCE_VIDEO;
+	case V4L2_BUF_TYPE_VBI_CAPTURE:
+		return EM28XX_RESOURCE_VBI;
+	default:
+		BUG();
+		return 0;
+	}
+}
+
+/* Usage lock check functions */
+static int res_get(struct em28xx *dev, enum v4l2_buf_type f_type)
+{
+	int res_type = get_ressource(f_type);
+
+	/* is it free? */
+	if (dev->resources & res_type) {
+		/* no, someone else uses it */
+		return -EBUSY;
+	}
+
+	/* it's free, grab it */
+	dev->resources |= res_type;
+	em28xx_videodbg("res: get %d\n", res_type);
+	return 0;
+}
+
+static void res_free(struct em28xx *dev, enum v4l2_buf_type f_type)
+{
+	int res_type = get_ressource(f_type);
+
+	dev->resources &= ~res_type;
+	em28xx_videodbg("res: put %d\n", res_type);
+}
+
+/* ------------------------------------------------------------------
+	Videobuf2 operations
+   ------------------------------------------------------------------*/
+
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+		       unsigned int *nbuffers, unsigned int *nplanes,
+		       unsigned int sizes[], void *alloc_ctxs[])
+{
+	struct em28xx *dev = vb2_get_drv_priv(vq);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	unsigned long size;
+
+	if (fmt)
+		size = fmt->fmt.pix.sizeimage;
+	else
+		size =
+		    (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
+
+	if (size == 0)
+		return -EINVAL;
+
+	if (0 == *nbuffers)
+		*nbuffers = 32;
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static int
+buffer_prepare(struct vb2_buffer *vb)
+{
+	struct em28xx        *dev = vb2_get_drv_priv(vb->vb2_queue);
+	struct em28xx_v4l2   *v4l2 = dev->v4l2;
+	struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+	unsigned long size;
+
+	em28xx_videodbg("%s, field=%d\n", __func__, vb->v4l2_buf.field);
+
+	size = (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		em28xx_videodbg("%s data will not fit into plane (%lu < %lu)\n",
+				__func__, vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+	vb2_set_plane_payload(&buf->vb, 0, size);
+
+	return 0;
+}
+
+int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct em28xx *dev = vb2_get_drv_priv(vq);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	struct v4l2_frequency f;
+	int rc = 0;
+
+	em28xx_videodbg("%s\n", __func__);
+
+	/* Make sure streaming is not already in progress for this type
+	   of filehandle (e.g. video, vbi) */
+	rc = res_get(dev, vq->type);
+	if (rc)
+		return rc;
+
+	if (v4l2->streaming_users == 0) {
+		/* First active streaming user, so allocate all the URBs */
+
+		/* Allocate the USB bandwidth */
+		em28xx_set_alternate(dev);
+
+		/* Needed, since GPIO might have disabled power of
+		   some i2c device
+		*/
+		em28xx_wake_i2c(dev);
+
+		v4l2->capture_type = -1;
+		rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE,
+					  dev->analog_xfer_bulk,
+					  EM28XX_NUM_BUFS,
+					  dev->max_pkt_size,
+					  dev->packet_multiplier,
+					  em28xx_urb_data_copy);
+		if (rc < 0)
+			return rc;
+
+		/*
+		 * djh: it's not clear whether this code is still needed.  I'm
+		 * leaving it in here for now entirely out of concern for
+		 * backward compatibility (the old code did it)
+		 */
+
+		/* Ask tuner to go to analog or radio mode */
+		memset(&f, 0, sizeof(f));
+		f.frequency = v4l2->frequency;
+		if (vq->owner && vq->owner->vdev->vfl_type == VFL_TYPE_RADIO)
+			f.type = V4L2_TUNER_RADIO;
+		else
+			f.type = V4L2_TUNER_ANALOG_TV;
+		v4l2_device_call_all(&v4l2->v4l2_dev,
+				     0, tuner, s_frequency, &f);
+	}
+
+	v4l2->streaming_users++;
+
+	return rc;
+}
+
+static void em28xx_stop_streaming(struct vb2_queue *vq)
+{
+	struct em28xx *dev = vb2_get_drv_priv(vq);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	struct em28xx_dmaqueue *vidq = &dev->vidq;
+	unsigned long flags = 0;
+
+	em28xx_videodbg("%s\n", __func__);
+
+	res_free(dev, vq->type);
+
+	if (v4l2->streaming_users-- == 1) {
+		/* Last active user, so shutdown all the URBS */
+		em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
+	}
+
+	spin_lock_irqsave(&dev->slock, flags);
+	if (dev->usb_ctl.vid_buf != NULL) {
+		vb2_buffer_done(&dev->usb_ctl.vid_buf->vb, VB2_BUF_STATE_ERROR);
+		dev->usb_ctl.vid_buf = NULL;
+	}
+	while (!list_empty(&vidq->active)) {
+		struct em28xx_buffer *buf;
+
+		buf = list_entry(vidq->active.next, struct em28xx_buffer, list);
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+	}
+	spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
+{
+	struct em28xx *dev = vb2_get_drv_priv(vq);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
+	unsigned long flags = 0;
+
+	em28xx_videodbg("%s\n", __func__);
+
+	res_free(dev, vq->type);
+
+	if (v4l2->streaming_users-- == 1) {
+		/* Last active user, so shutdown all the URBS */
+		em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
+	}
+
+	spin_lock_irqsave(&dev->slock, flags);
+	if (dev->usb_ctl.vbi_buf != NULL) {
+		vb2_buffer_done(&dev->usb_ctl.vbi_buf->vb, VB2_BUF_STATE_ERROR);
+		dev->usb_ctl.vbi_buf = NULL;
+	}
+	while (!list_empty(&vbiq->active)) {
+		struct em28xx_buffer *buf;
+
+		buf = list_entry(vbiq->active.next, struct em28xx_buffer, list);
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+	}
+	spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+static void
+buffer_queue(struct vb2_buffer *vb)
+{
+	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
+	struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+	struct em28xx_dmaqueue *vidq = &dev->vidq;
+	unsigned long flags = 0;
+
+	em28xx_videodbg("%s\n", __func__);
+	buf->mem = vb2_plane_vaddr(vb, 0);
+	buf->length = vb2_plane_size(vb, 0);
+
+	spin_lock_irqsave(&dev->slock, flags);
+	list_add_tail(&buf->list, &vidq->active);
+	spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+static struct vb2_ops em28xx_video_qops = {
+	.queue_setup    = queue_setup,
+	.buf_prepare    = buffer_prepare,
+	.buf_queue      = buffer_queue,
+	.start_streaming = em28xx_start_analog_streaming,
+	.stop_streaming = em28xx_stop_streaming,
+	.wait_prepare   = vb2_ops_wait_prepare,
+	.wait_finish    = vb2_ops_wait_finish,
+};
+
+static int em28xx_vb2_setup(struct em28xx *dev)
+{
+	int rc;
+	struct vb2_queue *q;
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	/* Setup Videobuf2 for Video capture */
+	q = &v4l2->vb_vidq;
+	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->drv_priv = dev;
+	q->buf_struct_size = sizeof(struct em28xx_buffer);
+	q->ops = &em28xx_video_qops;
+	q->mem_ops = &vb2_vmalloc_memops;
+
+	rc = vb2_queue_init(q);
+	if (rc < 0)
+		return rc;
+
+	/* Setup Videobuf2 for VBI capture */
+	q = &v4l2->vb_vbiq;
+	q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
+	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->drv_priv = dev;
+	q->buf_struct_size = sizeof(struct em28xx_buffer);
+	q->ops = &em28xx_vbi_qops;
+	q->mem_ops = &vb2_vmalloc_memops;
+
+	rc = vb2_queue_init(q);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+/*********************  v4l2 interface  **************************************/
+
+static void video_mux(struct em28xx *dev, int index)
+{
+	struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
+
+	dev->ctl_input = index;
+	dev->ctl_ainput = INPUT(index)->amux;
+	dev->ctl_aoutput = INPUT(index)->aout;
+
+	if (!dev->ctl_aoutput)
+		dev->ctl_aoutput = EM28XX_AOUT_MASTER;
+
+	v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
+			     INPUT(index)->vmux, 0, 0);
+
+	if (dev->board.has_msp34xx) {
+		if (dev->i2s_speed) {
+			v4l2_device_call_all(v4l2_dev, 0, audio,
+					     s_i2s_clock_freq, dev->i2s_speed);
+		}
+		/* Note: this is msp3400 specific */
+		v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
+				     dev->ctl_ainput,
+				     MSP_OUTPUT(MSP_SC_IN_DSP_SCART1), 0);
+	}
+
+	if (dev->board.adecoder != EM28XX_NOADECODER) {
+		v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
+				     dev->ctl_ainput, dev->ctl_aoutput, 0);
+	}
+
+	em28xx_audio_analog_set(dev);
+}
+
+static void em28xx_ctrl_notify(struct v4l2_ctrl *ctrl, void *priv)
+{
+	struct em28xx *dev = priv;
+
+	/*
+	 * In the case of non-AC97 volume controls, we still need
+	 * to do some setups at em28xx, in order to mute/unmute
+	 * and to adjust audio volume. However, the value ranges
+	 * should be checked by the corresponding V4L subdriver.
+	 */
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		dev->mute = ctrl->val;
+		em28xx_audio_analog_set(dev);
+		break;
+	case V4L2_CID_AUDIO_VOLUME:
+		dev->volume = ctrl->val;
+		em28xx_audio_analog_set(dev);
+		break;
+	}
+}
+
+static int em28xx_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct em28xx_v4l2 *v4l2 =
+		  container_of(ctrl->handler, struct em28xx_v4l2, ctrl_handler);
+	struct em28xx *dev = v4l2->dev;
+	int ret = -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		dev->mute = ctrl->val;
+		ret = em28xx_audio_analog_set(dev);
+		break;
+	case V4L2_CID_AUDIO_VOLUME:
+		dev->volume = ctrl->val;
+		ret = em28xx_audio_analog_set(dev);
+		break;
+	case V4L2_CID_CONTRAST:
+		ret = em28xx_write_reg(dev, EM28XX_R20_YGAIN, ctrl->val);
+		break;
+	case V4L2_CID_BRIGHTNESS:
+		ret = em28xx_write_reg(dev, EM28XX_R21_YOFFSET, ctrl->val);
+		break;
+	case V4L2_CID_SATURATION:
+		ret = em28xx_write_reg(dev, EM28XX_R22_UVGAIN, ctrl->val);
+		break;
+	case V4L2_CID_BLUE_BALANCE:
+		ret = em28xx_write_reg(dev, EM28XX_R23_UOFFSET, ctrl->val);
+		break;
+	case V4L2_CID_RED_BALANCE:
+		ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
+		break;
+	case V4L2_CID_SHARPNESS:
+		ret = em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, ctrl->val);
+		break;
+	}
+
+	return (ret < 0) ? ret : 0;
+}
+
+static const struct v4l2_ctrl_ops em28xx_ctrl_ops = {
+	.s_ctrl = em28xx_s_ctrl,
+};
+
+static void size_to_scale(struct em28xx *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 > EM28XX_HVSCALE_MAX)
+		*hscale = EM28XX_HVSCALE_MAX;
+
+	*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
+	if (*vscale > EM28XX_HVSCALE_MAX)
+		*vscale = EM28XX_HVSCALE_MAX;
+}
+
+static void scale_to_size(struct em28xx *dev,
+			  unsigned int hscale, unsigned int vscale,
+			  unsigned int *width, unsigned int *height)
+{
+	unsigned int          maxw = norm_maxw(dev);
+	unsigned int          maxh = norm_maxh(dev);
+
+	*width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
+	*height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
+}
+
+/* ------------------------------------------------------------------
+	IOCTL vidioc handling
+   ------------------------------------------------------------------*/
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct em28xx         *dev = video_drvdata(file);
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+
+	f->fmt.pix.width = v4l2->width;
+	f->fmt.pix.height = v4l2->height;
+	f->fmt.pix.pixelformat = v4l2->format->fourcc;
+	f->fmt.pix.bytesperline = (v4l2->width * v4l2->format->depth + 7) >> 3;
+	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * v4l2->height;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
+	if (v4l2->progressive)
+		f->fmt.pix.field = V4L2_FIELD_NONE;
+	else
+		f->fmt.pix.field = v4l2->interlaced_fieldmode ?
+			   V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
+	return 0;
+}
+
+static struct em28xx_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 em28xx         *dev   = video_drvdata(file);
+	struct em28xx_v4l2    *v4l2  = dev->v4l2;
+	unsigned int          width  = f->fmt.pix.width;
+	unsigned int          height = f->fmt.pix.height;
+	unsigned int          maxw   = norm_maxw(dev);
+	unsigned int          maxh   = norm_maxh(dev);
+	unsigned int          hscale, vscale;
+	struct em28xx_fmt     *fmt;
+
+	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+	if (!fmt) {
+		em28xx_videodbg("Fourcc format (%08x) invalid.\n",
+				f->fmt.pix.pixelformat);
+		return -EINVAL;
+	}
+
+	if (dev->board.is_em2800) {
+		/* the em2800 can only scale down to 50% */
+		height = height > (3 * maxh / 4) ? maxh : maxh / 2;
+		width = width > (3 * maxw / 4) ? maxw : maxw / 2;
+		/*
+		 * MaxPacketSize for em2800 is too small to capture at full
+		 * resolution use half of maxw as the scaler can only scale
+		 * to 50%
+		 */
+		if (width == maxw && height == maxh)
+			width /= 2;
+	} else {
+		/* width must even because of the YUYV format
+		   height must be even because of interlacing */
+		v4l_bound_align_image(&width, 48, maxw, 1, &height, 32, maxh,
+				      1, 0);
+	}
+
+	size_to_scale(dev, width, height, &hscale, &vscale);
+	scale_to_size(dev, hscale, vscale, &width, &height);
+
+	f->fmt.pix.width = width;
+	f->fmt.pix.height = height;
+	f->fmt.pix.pixelformat = fmt->fourcc;
+	f->fmt.pix.bytesperline = (width * fmt->depth + 7) >> 3;
+	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+	if (v4l2->progressive)
+		f->fmt.pix.field = V4L2_FIELD_NONE;
+	else
+		f->fmt.pix.field = v4l2->interlaced_fieldmode ?
+			   V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
+	f->fmt.pix.priv = 0;
+
+	return 0;
+}
+
+static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
+				   unsigned width, unsigned height)
+{
+	struct em28xx_fmt     *fmt;
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+
+	fmt = format_by_fourcc(fourcc);
+	if (!fmt)
+		return -EINVAL;
+
+	v4l2->format = fmt;
+	v4l2->width  = width;
+	v4l2->height = height;
+
+	/* set new image size */
+	size_to_scale(dev, v4l2->width, v4l2->height,
+		      &v4l2->hscale, &v4l2->vscale);
+
+	em28xx_resolution_set(dev);
+
+	return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct em28xx *dev = video_drvdata(file);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	if (vb2_is_busy(&v4l2->vb_vidq))
+		return -EBUSY;
+
+	vidioc_try_fmt_vid_cap(file, priv, f);
+
+	return em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
+				f->fmt.pix.width, f->fmt.pix.height);
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	*norm = dev->v4l2->norm;
+
+	return 0;
+}
+
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd, norm);
+
+	return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+	struct em28xx      *dev  = video_drvdata(file);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	struct v4l2_format f;
+
+	if (norm == v4l2->norm)
+		return 0;
+
+	if (v4l2->streaming_users > 0)
+		return -EBUSY;
+
+	v4l2->norm = norm;
+
+	/* Adjusts width/height, if needed */
+	f.fmt.pix.width = 720;
+	f.fmt.pix.height = (norm & V4L2_STD_525_60) ? 480 : 576;
+	vidioc_try_fmt_vid_cap(file, priv, &f);
+
+	/* set new image size */
+	v4l2->width = f.fmt.pix.width;
+	v4l2->height = f.fmt.pix.height;
+	size_to_scale(dev, v4l2->width, v4l2->height,
+		      &v4l2->hscale, &v4l2->vscale);
+
+	em28xx_resolution_set(dev);
+	v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
+
+	return 0;
+}
+
+static int vidioc_g_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *p)
+{
+	struct em28xx      *dev  = video_drvdata(file);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	int rc = 0;
+
+	p->parm.capture.readbuffers = EM28XX_MIN_BUF;
+	if (dev->board.is_webcam)
+		rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
+						video, g_parm, p);
+	else
+		v4l2_video_std_frame_period(v4l2->norm,
+					    &p->parm.capture.timeperframe);
+
+	return rc;
+}
+
+static int vidioc_s_parm(struct file *file, void *priv,
+			 struct v4l2_streamparm *p)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	p->parm.capture.readbuffers = EM28XX_MIN_BUF;
+	return v4l2_device_call_until_err(&dev->v4l2->v4l2_dev,
+					  0, video, s_parm, p);
+}
+
+static const char *iname[] = {
+	[EM28XX_VMUX_COMPOSITE1] = "Composite1",
+	[EM28XX_VMUX_COMPOSITE2] = "Composite2",
+	[EM28XX_VMUX_COMPOSITE3] = "Composite3",
+	[EM28XX_VMUX_COMPOSITE4] = "Composite4",
+	[EM28XX_VMUX_SVIDEO]     = "S-Video",
+	[EM28XX_VMUX_TELEVISION] = "Television",
+	[EM28XX_VMUX_CABLE]      = "Cable TV",
+	[EM28XX_VMUX_DVB]        = "DVB",
+	[EM28XX_VMUX_DEBUG]      = "for debug only",
+};
+
+static int vidioc_enum_input(struct file *file, void *priv,
+			     struct v4l2_input *i)
+{
+	struct em28xx *dev = video_drvdata(file);
+	unsigned int       n;
+
+	n = i->index;
+	if (n >= MAX_EM28XX_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 ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
+	    (EM28XX_VMUX_CABLE == INPUT(n)->type))
+		i->type = V4L2_INPUT_TYPE_TUNER;
+
+	i->std = dev->v4l2->vdev.tvnorms;
+	/* webcams do not have the STD API */
+	if (dev->board.is_webcam)
+		i->capabilities = 0;
+
+	return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	*i = dev->ctl_input;
+
+	return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (i >= MAX_EM28XX_INPUT)
+		return -EINVAL;
+	if (0 == INPUT(i)->type)
+		return -EINVAL;
+
+	video_mux(dev, i);
+	return 0;
+}
+
+static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	switch (a->index) {
+	case EM28XX_AMUX_VIDEO:
+		strcpy(a->name, "Television");
+		break;
+	case EM28XX_AMUX_LINE_IN:
+		strcpy(a->name, "Line In");
+		break;
+	case EM28XX_AMUX_VIDEO2:
+		strcpy(a->name, "Television alt");
+		break;
+	case EM28XX_AMUX_PHONE:
+		strcpy(a->name, "Phone");
+		break;
+	case EM28XX_AMUX_MIC:
+		strcpy(a->name, "Mic");
+		break;
+	case EM28XX_AMUX_CD:
+		strcpy(a->name, "CD");
+		break;
+	case EM28XX_AMUX_AUX:
+		strcpy(a->name, "Aux");
+		break;
+	case EM28XX_AMUX_PCM_OUT:
+		strcpy(a->name, "PCM");
+		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, const struct v4l2_audio *a)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (a->index >= MAX_EM28XX_INPUT)
+		return -EINVAL;
+	if (0 == INPUT(a->index)->type)
+		return -EINVAL;
+
+	dev->ctl_ainput = INPUT(a->index)->amux;
+	dev->ctl_aoutput = INPUT(a->index)->aout;
+
+	if (!dev->ctl_aoutput)
+		dev->ctl_aoutput = EM28XX_AOUT_MASTER;
+
+	return 0;
+}
+
+static int vidioc_g_tuner(struct file *file, void *priv,
+			  struct v4l2_tuner *t)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (0 != t->index)
+		return -EINVAL;
+
+	strcpy(t->name, "Tuner");
+
+	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
+	return 0;
+}
+
+static int vidioc_s_tuner(struct file *file, void *priv,
+			  const struct v4l2_tuner *t)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (0 != t->index)
+		return -EINVAL;
+
+	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
+	return 0;
+}
+
+static int vidioc_g_frequency(struct file *file, void *priv,
+			      struct v4l2_frequency *f)
+{
+	struct em28xx         *dev = video_drvdata(file);
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+
+	if (0 != f->tuner)
+		return -EINVAL;
+
+	f->frequency = v4l2->frequency;
+	return 0;
+}
+
+static int vidioc_s_frequency(struct file *file, void *priv,
+			      const struct v4l2_frequency *f)
+{
+	struct v4l2_frequency  new_freq = *f;
+	struct em28xx             *dev  = video_drvdata(file);
+	struct em28xx_v4l2        *v4l2 = dev->v4l2;
+
+	if (0 != f->tuner)
+		return -EINVAL;
+
+	v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
+	v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency, &new_freq);
+	v4l2->frequency = new_freq.frequency;
+
+	return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int vidioc_g_chip_info(struct file *file, void *priv,
+			      struct v4l2_dbg_chip_info *chip)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (chip->match.addr > 1)
+		return -EINVAL;
+	if (chip->match.addr == 1)
+		strlcpy(chip->name, "ac97", sizeof(chip->name));
+	else
+		strlcpy(chip->name,
+			dev->v4l2->v4l2_dev.name, sizeof(chip->name));
+	return 0;
+}
+
+static int em28xx_reg_len(int reg)
+{
+	switch (reg) {
+	case EM28XX_R40_AC97LSB:
+	case EM28XX_R30_HSCALELOW:
+	case EM28XX_R32_VSCALELOW:
+		return 2;
+	default:
+		return 1;
+	}
+}
+
+static int vidioc_g_register(struct file *file, void *priv,
+			     struct v4l2_dbg_register *reg)
+{
+	struct em28xx *dev = video_drvdata(file);
+	int ret;
+
+	if (reg->match.addr > 1)
+		return -EINVAL;
+	if (reg->match.addr) {
+		ret = em28xx_read_ac97(dev, reg->reg);
+		if (ret < 0)
+			return ret;
+
+		reg->val = ret;
+		reg->size = 1;
+		return 0;
+	}
+
+	/* Match host */
+	reg->size = em28xx_reg_len(reg->reg);
+	if (reg->size == 1) {
+		ret = em28xx_read_reg(dev, reg->reg);
+
+		if (ret < 0)
+			return ret;
+
+		reg->val = ret;
+	} else {
+		__le16 val = 0;
+
+		ret = dev->em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
+						   reg->reg, (char *)&val, 2);
+		if (ret < 0)
+			return ret;
+
+		reg->val = le16_to_cpu(val);
+	}
+
+	return 0;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+			     const struct v4l2_dbg_register *reg)
+{
+	struct em28xx *dev = video_drvdata(file);
+	__le16 buf;
+
+	if (reg->match.addr > 1)
+		return -EINVAL;
+	if (reg->match.addr)
+		return em28xx_write_ac97(dev, reg->reg, reg->val);
+
+	/* Match host */
+	buf = cpu_to_le16(reg->val);
+
+	return em28xx_write_regs(dev, reg->reg, (char *)&buf,
+			       em28xx_reg_len(reg->reg));
+}
+#endif
+
+static int vidioc_querycap(struct file *file, void  *priv,
+			   struct v4l2_capability *cap)
+{
+	struct video_device   *vdev = video_devdata(file);
+	struct em28xx         *dev  = video_drvdata(file);
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+
+	strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
+	strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+
+	if (vdev->vfl_type == VFL_TYPE_GRABBER)
+		cap->device_caps = V4L2_CAP_READWRITE |
+			V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	else if (vdev->vfl_type == VFL_TYPE_RADIO)
+		cap->device_caps = V4L2_CAP_RADIO;
+	else
+		cap->device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE;
+
+	if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
+		cap->device_caps |= V4L2_CAP_AUDIO;
+
+	if (dev->tuner_type != TUNER_ABSENT)
+		cap->device_caps |= V4L2_CAP_TUNER;
+
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS |
+		V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	if (video_is_registered(&v4l2->vbi_dev))
+		cap->capabilities |= V4L2_CAP_VBI_CAPTURE;
+	if (video_is_registered(&v4l2->radio_dev))
+		cap->capabilities |= V4L2_CAP_RADIO;
+	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;
+}
+
+static int vidioc_enum_framesizes(struct file *file, void *priv,
+				  struct v4l2_frmsizeenum *fsize)
+{
+	struct em28xx         *dev = video_drvdata(file);
+	struct em28xx_fmt     *fmt;
+	unsigned int	      maxw = norm_maxw(dev);
+	unsigned int	      maxh = norm_maxh(dev);
+
+	fmt = format_by_fourcc(fsize->pixel_format);
+	if (!fmt) {
+		em28xx_videodbg("Fourcc format (%08x) invalid.\n",
+				fsize->pixel_format);
+		return -EINVAL;
+	}
+
+	if (dev->board.is_em2800) {
+		if (fsize->index > 1)
+			return -EINVAL;
+		fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+		fsize->discrete.width = maxw / (1 + fsize->index);
+		fsize->discrete.height = maxh / (1 + fsize->index);
+		return 0;
+	}
+
+	if (fsize->index != 0)
+		return -EINVAL;
+
+	/* Report a continuous range */
+	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+	scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
+		      &fsize->stepwise.min_width, &fsize->stepwise.min_height);
+	if (fsize->stepwise.min_width < 48)
+		fsize->stepwise.min_width = 48;
+	if (fsize->stepwise.min_height < 38)
+		fsize->stepwise.min_height = 38;
+	fsize->stepwise.max_width = maxw;
+	fsize->stepwise.max_height = maxh;
+	fsize->stepwise.step_width = 1;
+	fsize->stepwise.step_height = 1;
+	return 0;
+}
+
+/* RAW VBI ioctls */
+
+static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
+				struct v4l2_format *format)
+{
+	struct em28xx         *dev  = video_drvdata(file);
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+
+	format->fmt.vbi.samples_per_line = v4l2->vbi_width;
+	format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
+	format->fmt.vbi.offset = 0;
+	format->fmt.vbi.flags = 0;
+	format->fmt.vbi.sampling_rate = 6750000 * 4 / 2;
+	format->fmt.vbi.count[0] = v4l2->vbi_height;
+	format->fmt.vbi.count[1] = v4l2->vbi_height;
+	memset(format->fmt.vbi.reserved, 0, sizeof(format->fmt.vbi.reserved));
+
+	/* Varies by video standard (NTSC, PAL, etc.) */
+	if (v4l2->norm & V4L2_STD_525_60) {
+		/* NTSC */
+		format->fmt.vbi.start[0] = 10;
+		format->fmt.vbi.start[1] = 273;
+	} else if (v4l2->norm & V4L2_STD_625_50) {
+		/* PAL */
+		format->fmt.vbi.start[0] = 6;
+		format->fmt.vbi.start[1] = 318;
+	}
+
+	return 0;
+}
+
+/* ----------------------------------------------------------- */
+/* RADIO ESPECIFIC IOCTLS                                      */
+/* ----------------------------------------------------------- */
+
+static int radio_g_tuner(struct file *file, void *priv,
+			 struct v4l2_tuner *t)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (unlikely(t->index > 0))
+		return -EINVAL;
+
+	strcpy(t->name, "Radio");
+
+	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
+
+	return 0;
+}
+
+static int radio_s_tuner(struct file *file, void *priv,
+			 const struct v4l2_tuner *t)
+{
+	struct em28xx *dev = video_drvdata(file);
+
+	if (0 != t->index)
+		return -EINVAL;
+
+	v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
+
+	return 0;
+}
+
+/*
+ * em28xx_free_v4l2() - Free struct em28xx_v4l2
+ *
+ * @ref: struct kref for struct em28xx_v4l2
+ *
+ * Called when all users of struct em28xx_v4l2 are gone
+ */
+static void em28xx_free_v4l2(struct kref *ref)
+{
+	struct em28xx_v4l2 *v4l2 = container_of(ref, struct em28xx_v4l2, ref);
+
+	v4l2->dev->v4l2 = NULL;
+	kfree(v4l2);
+}
+
+/*
+ * em28xx_v4l2_open()
+ * inits the device and starts isoc transfer
+ */
+static int em28xx_v4l2_open(struct file *filp)
+{
+	struct video_device *vdev = video_devdata(filp);
+	struct em28xx *dev = video_drvdata(filp);
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+	enum v4l2_buf_type fh_type = 0;
+	int ret;
+
+	switch (vdev->vfl_type) {
+	case VFL_TYPE_GRABBER:
+		fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		break;
+	case VFL_TYPE_VBI:
+		fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
+		break;
+	case VFL_TYPE_RADIO:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	em28xx_videodbg("open dev=%s type=%s users=%d\n",
+			video_device_node_name(vdev), v4l2_type_names[fh_type],
+			v4l2->users);
+
+	if (mutex_lock_interruptible(&dev->lock))
+		return -ERESTARTSYS;
+
+	ret = v4l2_fh_open(filp);
+	if (ret) {
+		em28xx_errdev("%s: v4l2_fh_open() returned error %d\n",
+			      __func__, ret);
+		mutex_unlock(&dev->lock);
+		return ret;
+	}
+
+	if (v4l2->users == 0) {
+		em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
+
+		if (vdev->vfl_type != VFL_TYPE_RADIO)
+			em28xx_resolution_set(dev);
+
+		/*
+		 * Needed, since GPIO might have disabled power
+		 * of some i2c devices
+		 */
+		em28xx_wake_i2c(dev);
+	}
+
+	if (vdev->vfl_type == VFL_TYPE_RADIO) {
+		em28xx_videodbg("video_open: setting radio device\n");
+		v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
+	}
+
+	kref_get(&dev->ref);
+	kref_get(&v4l2->ref);
+	v4l2->users++;
+
+	mutex_unlock(&dev->lock);
+
+	return 0;
+}
+
+/*
+ * em28xx_v4l2_fini()
+ * unregisters the v4l2,i2c and usb devices
+ * called when the device gets disconected or at module unload
+*/
+static int em28xx_v4l2_fini(struct em28xx *dev)
+{
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
+
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
+	if (!dev->has_video) {
+		/* This device does not support the v4l2 extension */
+		return 0;
+	}
+
+	if (v4l2 == NULL)
+		return 0;
+
+	em28xx_info("Closing video extension\n");
+
+	mutex_lock(&dev->lock);
+
+	v4l2_device_disconnect(&v4l2->v4l2_dev);
+
+	em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
+
+	if (video_is_registered(&v4l2->radio_dev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->radio_dev));
+		video_unregister_device(&v4l2->radio_dev);
+	}
+	if (video_is_registered(&v4l2->vbi_dev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->vbi_dev));
+		video_unregister_device(&v4l2->vbi_dev);
+	}
+	if (video_is_registered(&v4l2->vdev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->vdev));
+		video_unregister_device(&v4l2->vdev);
+	}
+
+	v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
+	v4l2_device_unregister(&v4l2->v4l2_dev);
+
+	if (v4l2->clk) {
+		v4l2_clk_unregister_fixed(v4l2->clk);
+		v4l2->clk = NULL;
+	}
+
+	kref_put(&v4l2->ref, em28xx_free_v4l2);
+
+	mutex_unlock(&dev->lock);
+
+	kref_put(&dev->ref, em28xx_free_device);
+
+	return 0;
+}
+
+static int em28xx_v4l2_suspend(struct em28xx *dev)
+{
+	if (dev->is_audio_only)
+		return 0;
+
+	if (!dev->has_video)
+		return 0;
+
+	em28xx_info("Suspending video extension\n");
+	em28xx_stop_urbs(dev);
+	return 0;
+}
+
+static int em28xx_v4l2_resume(struct em28xx *dev)
+{
+	if (dev->is_audio_only)
+		return 0;
+
+	if (!dev->has_video)
+		return 0;
+
+	em28xx_info("Resuming video extension\n");
+	/* what do we do here */
+	return 0;
+}
+
+/*
+ * em28xx_v4l2_close()
+ * stops streaming and deallocates all resources allocated by the v4l2
+ * calls and ioctls
+ */
+static int em28xx_v4l2_close(struct file *filp)
+{
+	struct em28xx         *dev  = video_drvdata(filp);
+	struct em28xx_v4l2    *v4l2 = dev->v4l2;
+	int              errCode;
+
+	em28xx_videodbg("users=%d\n", v4l2->users);
+
+	vb2_fop_release(filp);
+	mutex_lock(&dev->lock);
+
+	if (v4l2->users == 1) {
+		/* No sense to try to write to the device */
+		if (dev->disconnected)
+			goto exit;
+
+		/* Save some power by putting tuner to sleep */
+		v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);
+
+		/* do this before setting alternate! */
+		em28xx_set_mode(dev, EM28XX_SUSPEND);
+
+		/* set alternate 0 */
+		dev->alt = 0;
+		em28xx_videodbg("setting alternate 0\n");
+		errCode = usb_set_interface(dev->udev, 0, 0);
+		if (errCode < 0) {
+			em28xx_errdev("cannot change alternate number to "
+					"0 (error=%i)\n", errCode);
+		}
+	}
+
+exit:
+	v4l2->users--;
+	kref_put(&v4l2->ref, em28xx_free_v4l2);
+	mutex_unlock(&dev->lock);
+	kref_put(&dev->ref, em28xx_free_device);
+
+	return 0;
+}
+
+static const struct v4l2_file_operations em28xx_v4l_fops = {
+	.owner         = THIS_MODULE,
+	.open          = em28xx_v4l2_open,
+	.release       = em28xx_v4l2_close,
+	.read          = vb2_fop_read,
+	.poll          = vb2_fop_poll,
+	.mmap          = vb2_fop_mmap,
+	.unlocked_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_g_fmt_vbi_cap,
+	.vidioc_s_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
+	.vidioc_enum_framesizes     = vidioc_enum_framesizes,
+	.vidioc_g_audio             = vidioc_g_audio,
+	.vidioc_s_audio             = vidioc_s_audio,
+
+	.vidioc_reqbufs             = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs         = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf         = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf            = vb2_ioctl_querybuf,
+	.vidioc_qbuf                = vb2_ioctl_qbuf,
+	.vidioc_dqbuf               = vb2_ioctl_dqbuf,
+
+	.vidioc_g_std               = vidioc_g_std,
+	.vidioc_querystd            = vidioc_querystd,
+	.vidioc_s_std               = vidioc_s_std,
+	.vidioc_g_parm		    = vidioc_g_parm,
+	.vidioc_s_parm		    = vidioc_s_parm,
+	.vidioc_enum_input          = vidioc_enum_input,
+	.vidioc_g_input             = vidioc_g_input,
+	.vidioc_s_input             = vidioc_s_input,
+	.vidioc_streamon            = vb2_ioctl_streamon,
+	.vidioc_streamoff           = vb2_ioctl_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,
+	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_chip_info         = vidioc_g_chip_info,
+	.vidioc_g_register          = vidioc_g_register,
+	.vidioc_s_register          = vidioc_s_register,
+#endif
+};
+
+static const struct video_device em28xx_video_template = {
+	.fops		= &em28xx_v4l_fops,
+	.ioctl_ops	= &video_ioctl_ops,
+	.release	= video_device_release_empty,
+	.tvnorms	= V4L2_STD_ALL,
+};
+
+static const struct v4l2_file_operations radio_fops = {
+	.owner         = THIS_MODULE,
+	.open          = em28xx_v4l2_open,
+	.release       = em28xx_v4l2_close,
+	.unlocked_ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops radio_ioctl_ops = {
+	.vidioc_querycap      = vidioc_querycap,
+	.vidioc_g_tuner       = radio_g_tuner,
+	.vidioc_s_tuner       = radio_s_tuner,
+	.vidioc_g_frequency   = vidioc_g_frequency,
+	.vidioc_s_frequency   = vidioc_s_frequency,
+	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_chip_info   = vidioc_g_chip_info,
+	.vidioc_g_register    = vidioc_g_register,
+	.vidioc_s_register    = vidioc_s_register,
+#endif
+};
+
+static struct video_device em28xx_radio_template = {
+	.fops		= &radio_fops,
+	.ioctl_ops	= &radio_ioctl_ops,
+	.release	= video_device_release_empty,
+};
+
+/* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
+static unsigned short saa711x_addrs[] = {
+	0x4a >> 1, 0x48 >> 1,   /* SAA7111, SAA7111A and SAA7113 */
+	0x42 >> 1, 0x40 >> 1,   /* SAA7114, SAA7115 and SAA7118 */
+	I2C_CLIENT_END };
+
+static unsigned short tvp5150_addrs[] = {
+	0xb8 >> 1,
+	0xba >> 1,
+	I2C_CLIENT_END
+};
+
+static unsigned short msp3400_addrs[] = {
+	0x80 >> 1,
+	0x88 >> 1,
+	I2C_CLIENT_END
+};
+
+/******************************** usb interface ******************************/
+
+static void em28xx_vdev_init(struct em28xx *dev,
+			     struct video_device *vfd,
+			     const struct video_device *template,
+			     const char *type_name)
+{
+	*vfd		= *template;
+	vfd->v4l2_dev	= &dev->v4l2->v4l2_dev;
+	vfd->lock	= &dev->lock;
+	if (dev->board.is_webcam)
+		vfd->tvnorms = 0;
+
+	snprintf(vfd->name, sizeof(vfd->name), "%s %s",
+		 dev->name, type_name);
+
+	video_set_drvdata(vfd, dev);
+}
+
+static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr)
+{
+	struct em28xx_v4l2      *v4l2 = dev->v4l2;
+	struct v4l2_device      *v4l2_dev = &v4l2->v4l2_dev;
+	struct tuner_setup      tun_setup;
+	struct v4l2_frequency   f;
+
+	memset(&tun_setup, 0, sizeof(tun_setup));
+
+	tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+	tun_setup.tuner_callback = em28xx_tuner_callback;
+
+	if (dev->board.radio.type) {
+		tun_setup.type = dev->board.radio.type;
+		tun_setup.addr = dev->board.radio_addr;
+
+		v4l2_device_call_all(v4l2_dev,
+				     0, tuner, s_type_addr, &tun_setup);
+	}
+
+	if ((dev->tuner_type != TUNER_ABSENT) && (dev->tuner_type)) {
+		tun_setup.type   = dev->tuner_type;
+		tun_setup.addr   = tuner_addr;
+
+		v4l2_device_call_all(v4l2_dev,
+				     0, tuner, s_type_addr, &tun_setup);
+	}
+
+	if (dev->board.tda9887_conf) {
+		struct v4l2_priv_tun_config tda9887_cfg;
+
+		tda9887_cfg.tuner = TUNER_TDA9887;
+		tda9887_cfg.priv = &dev->board.tda9887_conf;
+
+		v4l2_device_call_all(v4l2_dev,
+				     0, tuner, s_config, &tda9887_cfg);
+	}
+
+	if (dev->tuner_type == TUNER_XC2028) {
+		struct v4l2_priv_tun_config  xc2028_cfg;
+		struct xc2028_ctrl           ctl;
+
+		memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
+		memset(&ctl, 0, sizeof(ctl));
+
+		em28xx_setup_xc3028(dev, &ctl);
+
+		xc2028_cfg.tuner = TUNER_XC2028;
+		xc2028_cfg.priv  = &ctl;
+
+		v4l2_device_call_all(v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
+	}
+
+	/* configure tuner */
+	f.tuner = 0;
+	f.type = V4L2_TUNER_ANALOG_TV;
+	f.frequency = 9076;     /* just a magic number */
+	v4l2->frequency = f.frequency;
+	v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
+}
+
+static int em28xx_v4l2_init(struct em28xx *dev)
+{
+	u8 val;
+	int ret;
+	unsigned int maxw;
+	struct v4l2_ctrl_handler *hdl;
+	struct em28xx_v4l2 *v4l2;
+
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
+	if (!dev->has_video) {
+		/* This device does not support the v4l2 extension */
+		return 0;
+	}
+
+	em28xx_info("Registering V4L2 extension\n");
+
+	mutex_lock(&dev->lock);
+
+	v4l2 = kzalloc(sizeof(struct em28xx_v4l2), GFP_KERNEL);
+	if (v4l2 == NULL) {
+		em28xx_info("em28xx_v4l: memory allocation failed\n");
+		mutex_unlock(&dev->lock);
+		return -ENOMEM;
+	}
+	kref_init(&v4l2->ref);
+	v4l2->dev = dev;
+	dev->v4l2 = v4l2;
+
+	ret = v4l2_device_register(&dev->udev->dev, &v4l2->v4l2_dev);
+	if (ret < 0) {
+		em28xx_errdev("Call to v4l2_device_register() failed!\n");
+		goto err;
+	}
+
+	hdl = &v4l2->ctrl_handler;
+	v4l2_ctrl_handler_init(hdl, 8);
+	v4l2->v4l2_dev.ctrl_handler = hdl;
+
+	if (dev->board.is_webcam)
+		v4l2->progressive = true;
+
+	/*
+	 * Default format, used for tvp5150 or saa711x output formats
+	 */
+	v4l2->vinmode = 0x10;
+	v4l2->vinctl  = EM28XX_VINCTRL_INTERLACED |
+			EM28XX_VINCTRL_CCIR656_ENABLE;
+
+	/* request some modules */
+
+	if (dev->board.has_msp34xx)
+		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+				    &dev->i2c_adap[dev->def_i2c_bus],
+				    "msp3400", 0, msp3400_addrs);
+
+	if (dev->board.decoder == EM28XX_SAA711X)
+		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+				    &dev->i2c_adap[dev->def_i2c_bus],
+				    "saa7115_auto", 0, saa711x_addrs);
+
+	if (dev->board.decoder == EM28XX_TVP5150)
+		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+				    &dev->i2c_adap[dev->def_i2c_bus],
+				    "tvp5150", 0, tvp5150_addrs);
+
+	if (dev->board.adecoder == EM28XX_TVAUDIO)
+		v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+				    &dev->i2c_adap[dev->def_i2c_bus],
+				    "tvaudio", dev->board.tvaudio_addr, NULL);
+
+	/* Initialize tuner and camera */
+
+	if (dev->board.tuner_type != TUNER_ABSENT) {
+		unsigned short tuner_addr = dev->board.tuner_addr;
+		int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);
+
+		if (dev->board.radio.type)
+			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+					    &dev->i2c_adap[dev->def_i2c_bus],
+					    "tuner", dev->board.radio_addr,
+					    NULL);
+
+		if (has_demod)
+			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+					    &dev->i2c_adap[dev->def_i2c_bus],
+					    "tuner", 0,
+					    v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
+		if (tuner_addr == 0) {
+			enum v4l2_i2c_tuner_type type =
+				has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
+			struct v4l2_subdev *sd;
+
+			sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+						 &dev->i2c_adap[dev->def_i2c_bus],
+						 "tuner", 0,
+						 v4l2_i2c_tuner_addrs(type));
+
+			if (sd)
+				tuner_addr = v4l2_i2c_subdev_addr(sd);
+		} else {
+			v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
+					    &dev->i2c_adap[dev->def_i2c_bus],
+					    "tuner", tuner_addr, NULL);
+		}
+
+		em28xx_tuner_setup(dev, tuner_addr);
+	}
+
+	if (dev->em28xx_sensor != EM28XX_NOSENSOR)
+		em28xx_init_camera(dev);
+
+	/* Configure audio */
+	ret = em28xx_audio_setup(dev);
+	if (ret < 0) {
+		em28xx_errdev("%s: Error while setting audio - error [%d]!\n",
+			      __func__, ret);
+		goto unregister_dev;
+	}
+	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_AUDIO_VOLUME, 0, 0x1f, 1, 0x1f);
+	} else {
+		/* install the em28xx notify callback */
+		v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_MUTE),
+				 em28xx_ctrl_notify, dev);
+		v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_VOLUME),
+				 em28xx_ctrl_notify, dev);
+	}
+
+	/* wake i2c devices */
+	em28xx_wake_i2c(dev);
+
+	/* init video dma queues */
+	INIT_LIST_HEAD(&dev->vidq.active);
+	INIT_LIST_HEAD(&dev->vbiq.active);
+
+	if (dev->board.has_msp34xx) {
+		/* Send a reset to other chips via gpio */
+		ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xf7);
+		if (ret < 0) {
+			em28xx_errdev("%s: em28xx_write_reg - msp34xx(1) failed! error [%d]\n",
+				      __func__, ret);
+			goto unregister_dev;
+		}
+		msleep(3);
+
+		ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xff);
+		if (ret < 0) {
+			em28xx_errdev("%s: em28xx_write_reg - msp34xx(2) failed! error [%d]\n",
+				      __func__, ret);
+			goto unregister_dev;
+		}
+		msleep(3);
+	}
+
+	/* set default norm */
+	v4l2->norm = V4L2_STD_PAL;
+	v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
+	v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;
+
+	/* Analog specific initialization */
+	v4l2->format = &format[0];
+
+	maxw = norm_maxw(dev);
+	/* MaxPacketSize for em2800 is too small to capture at full resolution
+	 * use half of maxw as the scaler can only scale to 50% */
+	if (dev->board.is_em2800)
+		maxw /= 2;
+
+	em28xx_set_video_format(dev, format[0].fourcc,
+				maxw, norm_maxh(dev));
+
+	video_mux(dev, 0);
+
+	/* Audio defaults */
+	dev->mute = 1;
+	dev->volume = 0x1f;
+
+/*	em28xx_write_reg(dev, EM28XX_R0E_AUDIOSRC, 0xc0); audio register */
+	val = (u8)em28xx_read_reg(dev, EM28XX_R0F_XCLK);
+	em28xx_write_reg(dev, EM28XX_R0F_XCLK,
+			 (EM28XX_XCLK_AUDIO_UNMUTE | val));
+
+	em28xx_set_outfmt(dev);
+
+	/* Add image controls */
+	/* NOTE: at this point, the subdevices are already registered, so bridge
+	 * controls are only added/enabled when no subdevice provides them */
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_CONTRAST))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_CONTRAST,
+				  0, 0x1f, 1, CONTRAST_DEFAULT);
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_BRIGHTNESS))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_BRIGHTNESS,
+				  -0x80, 0x7f, 1, BRIGHTNESS_DEFAULT);
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_SATURATION))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_SATURATION,
+				  0, 0x1f, 1, SATURATION_DEFAULT);
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_BLUE_BALANCE))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_BLUE_BALANCE,
+				  -0x30, 0x30, 1, BLUE_BALANCE_DEFAULT);
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_RED_BALANCE))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_RED_BALANCE,
+				  -0x30, 0x30, 1, RED_BALANCE_DEFAULT);
+	if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_SHARPNESS))
+		v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
+				  V4L2_CID_SHARPNESS,
+				  0, 0x0f, 1, SHARPNESS_DEFAULT);
+
+	/* Reset image controls */
+	em28xx_colorlevels_set_default(dev);
+	v4l2_ctrl_handler_setup(hdl);
+	ret = hdl->error;
+	if (ret)
+		goto unregister_dev;
+
+	/* allocate and fill video video_device struct */
+	em28xx_vdev_init(dev, &v4l2->vdev, &em28xx_video_template, "video");
+	mutex_init(&v4l2->vb_queue_lock);
+	mutex_init(&v4l2->vb_vbi_queue_lock);
+	v4l2->vdev.queue = &v4l2->vb_vidq;
+	v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
+
+	/* disable inapplicable ioctls */
+	if (dev->board.is_webcam) {
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_QUERYSTD);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_STD);
+	} else {
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_PARM);
+	}
+	if (dev->tuner_type == TUNER_ABSENT) {
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_TUNER);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_TUNER);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_FREQUENCY);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_FREQUENCY);
+	}
+	if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_AUDIO);
+		v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_AUDIO);
+	}
+
+	/* register v4l2 video video_device */
+	ret = video_register_device(&v4l2->vdev, VFL_TYPE_GRABBER,
+				    video_nr[dev->devno]);
+	if (ret) {
+		em28xx_errdev("unable to register video device (error=%i).\n",
+			      ret);
+		goto unregister_dev;
+	}
+
+	/* Allocate and fill vbi video_device struct */
+	if (em28xx_vbi_supported(dev) == 1) {
+		em28xx_vdev_init(dev, &v4l2->vbi_dev, &em28xx_video_template,
+				"vbi");
+
+		v4l2->vbi_dev.queue = &v4l2->vb_vbiq;
+		v4l2->vbi_dev.queue->lock = &v4l2->vb_vbi_queue_lock;
+
+		/* disable inapplicable ioctls */
+		v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_PARM);
+		if (dev->tuner_type == TUNER_ABSENT) {
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_TUNER);
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_TUNER);
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_FREQUENCY);
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_FREQUENCY);
+		}
+		if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_G_AUDIO);
+			v4l2_disable_ioctl(&v4l2->vbi_dev, VIDIOC_S_AUDIO);
+		}
+
+		/* register v4l2 vbi video_device */
+		ret = video_register_device(&v4l2->vbi_dev, VFL_TYPE_VBI,
+					    vbi_nr[dev->devno]);
+		if (ret < 0) {
+			em28xx_errdev("unable to register vbi device\n");
+			goto unregister_dev;
+		}
+	}
+
+	if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
+		em28xx_vdev_init(dev, &v4l2->radio_dev, &em28xx_radio_template,
+				   "radio");
+		ret = video_register_device(&v4l2->radio_dev, VFL_TYPE_RADIO,
+					    radio_nr[dev->devno]);
+		if (ret < 0) {
+			em28xx_errdev("can't register radio device\n");
+			goto unregister_dev;
+		}
+		em28xx_info("Registered radio device as %s\n",
+			    video_device_node_name(&v4l2->radio_dev));
+	}
+
+	em28xx_info("V4L2 video device registered as %s\n",
+		    video_device_node_name(&v4l2->vdev));
+
+	if (video_is_registered(&v4l2->vbi_dev))
+		em28xx_info("V4L2 VBI device registered as %s\n",
+			    video_device_node_name(&v4l2->vbi_dev));
+
+	/* Save some power by putting tuner to sleep */
+	v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);
+
+	/* initialize videobuf2 stuff */
+	em28xx_vb2_setup(dev);
+
+	em28xx_info("V4L2 extension successfully initialized\n");
+
+	kref_get(&dev->ref);
+
+	mutex_unlock(&dev->lock);
+	return 0;
+
+unregister_dev:
+	v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
+	v4l2_device_unregister(&v4l2->v4l2_dev);
+err:
+	dev->v4l2 = NULL;
+	kref_put(&v4l2->ref, em28xx_free_v4l2);
+	mutex_unlock(&dev->lock);
+	return ret;
+}
+
+static struct em28xx_ops v4l2_ops = {
+	.id   = EM28XX_V4L2,
+	.name = "Em28xx v4l2 Extension",
+	.init = em28xx_v4l2_init,
+	.fini = em28xx_v4l2_fini,
+	.suspend = em28xx_v4l2_suspend,
+	.resume = em28xx_v4l2_resume,
+};
+
+static int __init em28xx_video_register(void)
+{
+	return em28xx_register_extension(&v4l2_ops);
+}
+
+static void __exit em28xx_video_unregister(void)
+{
+	em28xx_unregister_extension(&v4l2_ops);
+}
+
+module_init(em28xx_video_register);
+module_exit(em28xx_video_unregister);