Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 847 insertions, 0 deletions

diff --git a/drivers/media/usb/stk1160/stk1160-v4l.c b/drivers/media/usb/stk1160/stk1160-v4l.c
new file mode 100644
index 0000000000..a1f785a5ff
--- /dev/null
+++ b/drivers/media/usb/stk1160/stk1160-v4l.c
@@ -0,0 +1,847 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * STK1160 driver
+ *
+ * Copyright (C) 2012 Ezequiel Garcia
+ * <elezegarcia--a.t--gmail.com>
+ *
+ * Based on Easycap driver by R.M. Thomas
+ *	Copyright (C) 2010 R.M. Thomas
+ *	<rmthomas--a.t--sciolus.org>
+ */
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-vmalloc.h>
+
+#include <media/i2c/saa7115.h>
+
+#include "stk1160.h"
+#include "stk1160-reg.h"
+
+static bool keep_buffers;
+module_param(keep_buffers, bool, 0644);
+MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
+
+enum stk1160_decimate_mode {
+	STK1160_DECIMATE_MORE_THAN_HALF,
+	STK1160_DECIMATE_LESS_THAN_HALF,
+};
+
+struct stk1160_decimate_ctrl {
+	bool col_en, row_en;
+	enum stk1160_decimate_mode col_mode, row_mode;
+	unsigned int col_n, row_n;
+};
+
+/* supported video standards */
+static struct stk1160_fmt format[] = {
+	{
+		.fourcc   = V4L2_PIX_FMT_UYVY,
+		.depth    = 16,
+	}
+};
+
+/*
+ * Helper to find the next divisor that results in modulo being zero.
+ * This is required to guarantee valid decimation unit counts.
+ */
+static unsigned int
+div_round_integer(unsigned int x, unsigned int y)
+{
+	for (;; y++) {
+		if (x % y == 0)
+			return x / y;
+	}
+}
+
+static void stk1160_set_std(struct stk1160 *dev)
+{
+	int i;
+
+	static struct regval std525[] = {
+
+		/* 720x480 */
+
+		/* Frame start */
+		{STK116_CFSPO_STX_L, 0x0000},
+		{STK116_CFSPO_STX_H, 0x0000},
+		{STK116_CFSPO_STY_L, 0x0003},
+		{STK116_CFSPO_STY_H, 0x0000},
+
+		/* Frame end */
+		{STK116_CFEPO_ENX_L, 0x05a0},
+		{STK116_CFEPO_ENX_H, 0x0005},
+		{STK116_CFEPO_ENY_L, 0x00f3},
+		{STK116_CFEPO_ENY_H, 0x0000},
+
+		{0xffff, 0xffff}
+	};
+
+	static struct regval std625[] = {
+
+		/* 720x576 */
+
+		/* TODO: Each line of frame has some junk at the end */
+		/* Frame start */
+		{STK116_CFSPO,   0x0000},
+		{STK116_CFSPO+1, 0x0000},
+		{STK116_CFSPO+2, 0x0001},
+		{STK116_CFSPO+3, 0x0000},
+
+		/* Frame end */
+		{STK116_CFEPO,   0x05a0},
+		{STK116_CFEPO+1, 0x0005},
+		{STK116_CFEPO+2, 0x0121},
+		{STK116_CFEPO+3, 0x0001},
+
+		{0xffff, 0xffff}
+	};
+
+	if (dev->norm & V4L2_STD_525_60) {
+		stk1160_dbg("registers to NTSC like standard\n");
+		for (i = 0; std525[i].reg != 0xffff; i++)
+			stk1160_write_reg(dev, std525[i].reg, std525[i].val);
+	} else {
+		stk1160_dbg("registers to PAL like standard\n");
+		for (i = 0; std625[i].reg != 0xffff; i++)
+			stk1160_write_reg(dev, std625[i].reg, std625[i].val);
+	}
+
+}
+
+static void stk1160_set_fmt(struct stk1160 *dev,
+			    struct stk1160_decimate_ctrl *ctrl)
+{
+	u32 val = 0;
+
+	if (ctrl) {
+		/*
+		 * Since the format is UYVY, the device must skip or send
+		 * a number of rows/columns multiple of four. This way, the
+		 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
+		 * does exactly this.
+		 */
+		val |= STK1160_DEC_UNIT_SIZE;
+		val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
+		val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
+		val |= ctrl->col_mode ==
+			STK1160_DECIMATE_MORE_THAN_HALF ?
+			STK1160_H_DEC_MODE : 0;
+		val |= ctrl->row_mode ==
+			STK1160_DECIMATE_MORE_THAN_HALF ?
+			STK1160_V_DEC_MODE : 0;
+
+		/* Horizontal count units */
+		stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
+		/* Vertical count units */
+		stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
+
+		stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
+			    val, ctrl->col_n, ctrl->row_n);
+	}
+
+	/* Decimation control */
+	stk1160_write_reg(dev, STK1160_DMCTRL, val);
+}
+
+/*
+ * Set a new alternate setting.
+ * Returns true is dev->max_pkt_size has changed, false otherwise.
+ */
+static bool stk1160_set_alternate(struct stk1160 *dev)
+{
+	int i, prev_alt = dev->alt;
+	unsigned int min_pkt_size;
+	bool new_pkt_size;
+
+	/*
+	 * If we don't set right alternate,
+	 * then we will get a green screen with junk.
+	 */
+	min_pkt_size = STK1160_MIN_PKT_SIZE;
+
+	for (i = 0; i < dev->num_alt; i++) {
+		/* stop when the selected alt setting offers enough bandwidth */
+		if (dev->alt_max_pkt_size[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[i] >
+			   dev->alt_max_pkt_size[dev->alt])
+			dev->alt = i;
+	}
+
+	stk1160_dbg("setting alternate %d\n", dev->alt);
+
+	if (dev->alt != prev_alt) {
+		stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
+				min_pkt_size, dev->alt);
+		stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
+			       dev->alt, dev->alt_max_pkt_size[dev->alt]);
+		usb_set_interface(dev->udev, 0, dev->alt);
+	}
+
+	new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
+	dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
+
+	return new_pkt_size;
+}
+
+static int stk1160_start_streaming(struct stk1160 *dev)
+{
+	bool new_pkt_size;
+	int rc = 0;
+	int i;
+
+	/* Check device presence */
+	if (!dev->udev)
+		return -ENODEV;
+
+	if (mutex_lock_interruptible(&dev->v4l_lock))
+		return -ERESTARTSYS;
+	/*
+	 * For some reason it is mandatory to set alternate *first*
+	 * and only *then* initialize isoc urbs.
+	 * Someone please explain me why ;)
+	 */
+	new_pkt_size = stk1160_set_alternate(dev);
+
+	/*
+	 * We (re)allocate isoc urbs if:
+	 * there is no allocated isoc urbs, OR
+	 * a new dev->max_pkt_size is detected
+	 */
+	if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
+		rc = stk1160_alloc_isoc(dev);
+		if (rc < 0)
+			goto out_stop_hw;
+	}
+
+	/* submit urbs and enables IRQ */
+	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
+		struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i];
+
+		dma_sync_sgtable_for_device(stk1160_get_dmadev(dev), stk_urb->sgt,
+					    DMA_FROM_DEVICE);
+		rc = usb_submit_urb(dev->isoc_ctl.urb_ctl[i].urb, GFP_KERNEL);
+		if (rc) {
+			stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
+			goto out_uninit;
+		}
+	}
+
+	/* Start saa711x */
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
+
+	dev->sequence = 0;
+
+	/* Start stk1160 */
+	stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
+	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+	stk1160_dbg("streaming started\n");
+
+	mutex_unlock(&dev->v4l_lock);
+
+	return 0;
+
+out_uninit:
+	stk1160_uninit_isoc(dev);
+out_stop_hw:
+	usb_set_interface(dev->udev, 0, 0);
+	stk1160_clear_queue(dev, VB2_BUF_STATE_QUEUED);
+
+	mutex_unlock(&dev->v4l_lock);
+
+	return rc;
+}
+
+/* Must be called with v4l_lock hold */
+static void stk1160_stop_hw(struct stk1160 *dev)
+{
+	/* If the device is not physically present, there is nothing to do */
+	if (!dev->udev)
+		return;
+
+	/* set alternate 0 */
+	dev->alt = 0;
+	stk1160_dbg("setting alternate %d\n", dev->alt);
+	usb_set_interface(dev->udev, 0, 0);
+
+	/* Stop stk1160 */
+	stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
+	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
+
+	/* Stop saa711x */
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
+}
+
+static int stk1160_stop_streaming(struct stk1160 *dev)
+{
+	if (mutex_lock_interruptible(&dev->v4l_lock))
+		return -ERESTARTSYS;
+
+	/*
+	 * Once URBs are cancelled, the URB complete handler
+	 * won't be running. This is required to safely release the
+	 * current buffer (dev->isoc_ctl.buf).
+	 */
+	stk1160_cancel_isoc(dev);
+
+	/*
+	 * It is possible to keep buffers around using a module parameter.
+	 * This is intended to avoid memory fragmentation.
+	 */
+	if (!keep_buffers)
+		stk1160_free_isoc(dev);
+
+	stk1160_stop_hw(dev);
+
+	stk1160_clear_queue(dev, VB2_BUF_STATE_ERROR);
+
+	stk1160_dbg("streaming stopped\n");
+
+	mutex_unlock(&dev->v4l_lock);
+
+	return 0;
+}
+
+static const struct v4l2_file_operations stk1160_fops = {
+	.owner = THIS_MODULE,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+	.mmap = vb2_fop_mmap,
+	.unlocked_ioctl = video_ioctl2,
+};
+
+/*
+ * vidioc ioctls
+ */
+static int vidioc_querycap(struct file *file,
+		void *priv, struct v4l2_capability *cap)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	strscpy(cap->driver, "stk1160", sizeof(cap->driver));
+	strscpy(cap->card, "stk1160", sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+	return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
+		struct v4l2_fmtdesc *f)
+{
+	if (f->index != 0)
+		return -EINVAL;
+
+	f->pixelformat = format[f->index].fourcc;
+	return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	f->fmt.pix.width = dev->width;
+	f->fmt.pix.height = dev->height;
+	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+	f->fmt.pix.pixelformat = dev->fmt->fourcc;
+	f->fmt.pix.bytesperline = dev->width * 2;
+	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+	return 0;
+}
+
+static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
+			    struct stk1160_decimate_ctrl *ctrl)
+{
+	unsigned int width, height;
+	unsigned int base_width, base_height;
+	unsigned int col_n, row_n;
+	enum stk1160_decimate_mode col_mode, row_mode;
+	bool col_en, row_en;
+
+	base_width = 720;
+	base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
+
+	/* Minimum width and height is 5% the frame size */
+	width = clamp_t(unsigned int, f->fmt.pix.width,
+			base_width / 20, base_width);
+	height = clamp_t(unsigned int, f->fmt.pix.height,
+			base_height / 20, base_height);
+
+	/* Let's set default no decimation values */
+	col_n = 0;
+	row_n = 0;
+	col_en = false;
+	row_en = false;
+	f->fmt.pix.width = base_width;
+	f->fmt.pix.height = base_height;
+	row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+	col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+
+	if (width < base_width && width > base_width / 2) {
+		/*
+		 * The device will send count units for each
+		 * unit skipped. This means count unit is:
+		 *
+		 * n = width / (frame width - width)
+		 *
+		 * And the width is:
+		 *
+		 * width = (n / n + 1) * frame width
+		 */
+		col_n = div_round_integer(width, base_width - width);
+		if (col_n > 0 && col_n <= 255) {
+			col_en = true;
+			col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+			f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
+		}
+
+	} else if (width <= base_width / 2) {
+
+		/*
+		 * The device will skip count units for each
+		 * unit sent. This means count is:
+		 *
+		 * n = (frame width / width) - 1
+		 *
+		 * And the width is:
+		 *
+		 * width = frame width / (n + 1)
+		 */
+		col_n = div_round_integer(base_width, width) - 1;
+		if (col_n > 0 && col_n <= 255) {
+			col_en = true;
+			col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
+			f->fmt.pix.width = base_width / (col_n + 1);
+		}
+	}
+
+	if (height < base_height && height > base_height / 2) {
+		row_n = div_round_integer(height, base_height - height);
+		if (row_n > 0 && row_n <= 255) {
+			row_en = true;
+			row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
+			f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
+		}
+
+	} else if (height <= base_height / 2) {
+		row_n = div_round_integer(base_height, height) - 1;
+		if (row_n > 0 && row_n <= 255) {
+			row_en = true;
+			row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
+			f->fmt.pix.height = base_height / (row_n + 1);
+		}
+	}
+
+	f->fmt.pix.pixelformat = dev->fmt->fourcc;
+	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+	if (ctrl) {
+		ctrl->col_en = col_en;
+		ctrl->col_n = col_n;
+		ctrl->col_mode = col_mode;
+		ctrl->row_en = row_en;
+		ctrl->row_n = row_n;
+		ctrl->row_mode = row_mode;
+	}
+
+	stk1160_dbg("width %d, height %d\n",
+		    f->fmt.pix.width, f->fmt.pix.height);
+	return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+				  struct v4l2_format *f)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	return stk1160_try_fmt(dev, f, NULL);
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct stk1160 *dev = video_drvdata(file);
+	struct vb2_queue *q = &dev->vb_vidq;
+	struct stk1160_decimate_ctrl ctrl;
+	int rc;
+
+	if (vb2_is_busy(q))
+		return -EBUSY;
+
+	rc = stk1160_try_fmt(dev, f, &ctrl);
+	if (rc < 0)
+		return rc;
+	dev->width = f->fmt.pix.width;
+	dev->height = f->fmt.pix.height;
+	stk1160_set_fmt(dev, &ctrl);
+
+	return 0;
+}
+
+static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	struct stk1160 *dev = video_drvdata(file);
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
+	return 0;
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	*norm = dev->norm;
+	return 0;
+}
+
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+	struct stk1160 *dev = video_drvdata(file);
+	struct vb2_queue *q = &dev->vb_vidq;
+
+	if (dev->norm == norm)
+		return 0;
+
+	if (vb2_is_busy(q))
+		return -EBUSY;
+
+	/* Check device presence */
+	if (!dev->udev)
+		return -ENODEV;
+
+	/* We need to set this now, before we call stk1160_set_std */
+	dev->width = 720;
+	dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
+	dev->norm = norm;
+
+	stk1160_set_std(dev);
+
+	/* Calling with NULL disables frame decimation */
+	stk1160_set_fmt(dev, NULL);
+
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+			dev->norm);
+
+	return 0;
+}
+
+
+static int vidioc_enum_input(struct file *file, void *priv,
+				struct v4l2_input *i)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	if (i->index > STK1160_MAX_INPUT)
+		return -EINVAL;
+
+	/* S-Video special handling */
+	if (i->index == STK1160_SVIDEO_INPUT)
+		sprintf(i->name, "S-Video");
+	else
+		sprintf(i->name, "Composite%d", i->index);
+
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+	i->std = dev->vdev.tvnorms;
+	return 0;
+}
+
+static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct stk1160 *dev = video_drvdata(file);
+	*i = dev->ctl_input;
+	return 0;
+}
+
+static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	if (i > STK1160_MAX_INPUT)
+		return -EINVAL;
+
+	dev->ctl_input = i;
+
+	stk1160_select_input(dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int vidioc_g_register(struct file *file, void *priv,
+			     struct v4l2_dbg_register *reg)
+{
+	struct stk1160 *dev = video_drvdata(file);
+	int rc;
+	u8 val;
+
+	/* Match host */
+	rc = stk1160_read_reg(dev, reg->reg, &val);
+	reg->val = val;
+	reg->size = 1;
+
+	return rc;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+			     const struct v4l2_dbg_register *reg)
+{
+	struct stk1160 *dev = video_drvdata(file);
+
+	/* Match host */
+	return stk1160_write_reg(dev, reg->reg, reg->val);
+}
+#endif
+
+static const struct v4l2_ioctl_ops stk1160_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_querystd      = vidioc_querystd,
+	.vidioc_g_std         = vidioc_g_std,
+	.vidioc_s_std         = vidioc_s_std,
+	.vidioc_enum_input    = vidioc_enum_input,
+	.vidioc_g_input       = vidioc_g_input,
+	.vidioc_s_input       = vidioc_s_input,
+
+	/* vb2 takes care of these */
+	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
+	.vidioc_querybuf      = vb2_ioctl_querybuf,
+	.vidioc_qbuf          = vb2_ioctl_qbuf,
+	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
+	.vidioc_streamon      = vb2_ioctl_streamon,
+	.vidioc_streamoff     = vb2_ioctl_streamoff,
+	.vidioc_expbuf        = vb2_ioctl_expbuf,
+
+	.vidioc_log_status  = v4l2_ctrl_log_status,
+	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_register = vidioc_g_register,
+	.vidioc_s_register = vidioc_s_register,
+#endif
+};
+
+/********************************************************************/
+
+/*
+ * Videobuf2 operations
+ */
+static int queue_setup(struct vb2_queue *vq,
+				unsigned int *nbuffers, unsigned int *nplanes,
+				unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct stk1160 *dev = vb2_get_drv_priv(vq);
+	unsigned long size;
+
+	size = dev->width * dev->height * 2;
+
+	/*
+	 * Here we can change the number of buffers being requested.
+	 * So, we set a minimum and a maximum like this:
+	 */
+	*nbuffers = clamp_t(unsigned int, *nbuffers,
+			STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
+
+	if (*nplanes)
+		return sizes[0] < size ? -EINVAL : 0;
+
+	/* This means a packed colorformat */
+	*nplanes = 1;
+
+	sizes[0] = size;
+
+	stk1160_dbg("%s: buffer count %d, each %ld bytes\n",
+		    __func__, *nbuffers, size);
+
+	return 0;
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+	unsigned long flags;
+	struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct stk1160_buffer *buf =
+		container_of(vbuf, struct stk1160_buffer, vb);
+
+	spin_lock_irqsave(&dev->buf_lock, flags);
+	if (!dev->udev) {
+		/*
+		 * If the device is disconnected return the buffer to userspace
+		 * directly. The next QBUF call will fail with -ENODEV.
+		 */
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	} else {
+
+		buf->mem = vb2_plane_vaddr(vb, 0);
+		buf->length = vb2_plane_size(vb, 0);
+		buf->bytesused = 0;
+		buf->pos = 0;
+
+		/*
+		 * If buffer length is less from expected then we return
+		 * the buffer to userspace directly.
+		 */
+		if (buf->length < dev->width * dev->height * 2)
+			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		else
+			list_add_tail(&buf->list, &dev->avail_bufs);
+
+	}
+	spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+static int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct stk1160 *dev = vb2_get_drv_priv(vq);
+	return stk1160_start_streaming(dev);
+}
+
+/* abort streaming and wait for last buffer */
+static void stop_streaming(struct vb2_queue *vq)
+{
+	struct stk1160 *dev = vb2_get_drv_priv(vq);
+	stk1160_stop_streaming(dev);
+}
+
+static const struct vb2_ops stk1160_video_qops = {
+	.queue_setup		= queue_setup,
+	.buf_queue		= buffer_queue,
+	.start_streaming	= start_streaming,
+	.stop_streaming		= stop_streaming,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
+};
+
+static const struct video_device v4l_template = {
+	.name = "stk1160",
+	.tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
+	.fops = &stk1160_fops,
+	.ioctl_ops = &stk1160_ioctl_ops,
+	.release = video_device_release_empty,
+};
+
+/********************************************************************/
+
+/* Must be called with both v4l_lock and vb_queue_lock hold */
+void stk1160_clear_queue(struct stk1160 *dev, enum vb2_buffer_state vb2_state)
+{
+	struct stk1160_buffer *buf;
+	unsigned long flags;
+
+	/* Release all active buffers */
+	spin_lock_irqsave(&dev->buf_lock, flags);
+	while (!list_empty(&dev->avail_bufs)) {
+		buf = list_first_entry(&dev->avail_bufs,
+			struct stk1160_buffer, list);
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
+		stk1160_dbg("buffer [%p/%d] aborted\n",
+			    buf, buf->vb.vb2_buf.index);
+	}
+
+	/* It's important to release the current buffer */
+	if (dev->isoc_ctl.buf) {
+		buf = dev->isoc_ctl.buf;
+		dev->isoc_ctl.buf = NULL;
+
+		vb2_buffer_done(&buf->vb.vb2_buf, vb2_state);
+		stk1160_dbg("buffer [%p/%d] aborted\n",
+			    buf, buf->vb.vb2_buf.index);
+	}
+	spin_unlock_irqrestore(&dev->buf_lock, flags);
+}
+
+int stk1160_vb2_setup(struct stk1160 *dev)
+{
+	int rc;
+	struct vb2_queue *q;
+
+	q = &dev->vb_vidq;
+	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+	q->drv_priv = dev;
+	q->buf_struct_size = sizeof(struct stk1160_buffer);
+	q->ops = &stk1160_video_qops;
+	q->mem_ops = &vb2_vmalloc_memops;
+	q->lock = &dev->vb_queue_lock;
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+	rc = vb2_queue_init(q);
+	if (rc < 0)
+		return rc;
+
+	/* initialize video dma queue */
+	INIT_LIST_HEAD(&dev->avail_bufs);
+
+	return 0;
+}
+
+int stk1160_video_register(struct stk1160 *dev)
+{
+	int rc;
+
+	/* Initialize video_device with a template structure */
+	dev->vdev = v4l_template;
+	dev->vdev.queue = &dev->vb_vidq;
+
+	/*
+	 * Provide mutexes for v4l2 core and for videobuf2 queue.
+	 * It will be used to protect *only* v4l2 ioctls.
+	 */
+	dev->vdev.lock = &dev->v4l_lock;
+
+	/* This will be used to set video_device parent */
+	dev->vdev.v4l2_dev = &dev->v4l2_dev;
+	dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
+				V4L2_CAP_READWRITE;
+
+	/* NTSC is default */
+	dev->norm = V4L2_STD_NTSC_M;
+	dev->width = 720;
+	dev->height = 480;
+
+	/* set default format */
+	dev->fmt = &format[0];
+	stk1160_set_std(dev);
+
+	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
+			dev->norm);
+
+	video_set_drvdata(&dev->vdev, dev);
+	rc = video_register_device(&dev->vdev, VFL_TYPE_VIDEO, -1);
+	if (rc < 0) {
+		stk1160_err("video_register_device failed (%d)\n", rc);
+		return rc;
+	}
+
+	v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
+		  video_device_node_name(&dev->vdev));
+
+	return 0;
+}