Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 976 insertions, 0 deletions

diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
new file mode 100644
index 0000000000..1e30e05953
--- /dev/null
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -0,0 +1,976 @@
+/*
+ * Copyright (c) 2013,2016 Lubomir Rintel
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * Fushicai USBTV007 Audio-Video Grabber Driver
+ *
+ * Product web site:
+ * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
+ *
+ * Following LWN articles were very useful in construction of this driver:
+ * Video4Linux2 API series: http://lwn.net/Articles/203924/
+ * videobuf2 API explanation: http://lwn.net/Articles/447435/
+ * Thanks go to Jonathan Corbet for providing this quality documentation.
+ * He is awesome.
+ *
+ * No physical hardware was harmed running Windows during the
+ * reverse-engineering activity
+ */
+
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+
+#include "usbtv.h"
+
+static const struct usbtv_norm_params norm_params[] = {
+	{
+		.norm = V4L2_STD_525_60,
+		.cap_width = 720,
+		.cap_height = 480,
+	},
+	{
+		.norm = V4L2_STD_625_50,
+		.cap_width = 720,
+		.cap_height = 576,
+	}
+};
+
+static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm)
+{
+	int i, ret = 0;
+	const struct usbtv_norm_params *params = NULL;
+
+	for (i = 0; i < ARRAY_SIZE(norm_params); i++) {
+		if (norm_params[i].norm & norm) {
+			params = &norm_params[i];
+			break;
+		}
+	}
+
+	if (params) {
+		usbtv->width = params->cap_width;
+		usbtv->height = params->cap_height;
+		usbtv->n_chunks = usbtv->width * usbtv->height
+						/ 4 / USBTV_CHUNK;
+		usbtv->norm = norm;
+	} else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+static int usbtv_select_input(struct usbtv *usbtv, int input)
+{
+	int ret;
+
+	static const u16 composite[][2] = {
+		{ USBTV_BASE + 0x0105, 0x0060 },
+		{ USBTV_BASE + 0x011f, 0x00f2 },
+		{ USBTV_BASE + 0x0127, 0x0060 },
+		{ USBTV_BASE + 0x00ae, 0x0010 },
+		{ USBTV_BASE + 0x0239, 0x0060 },
+	};
+
+	static const u16 svideo[][2] = {
+		{ USBTV_BASE + 0x0105, 0x0010 },
+		{ USBTV_BASE + 0x011f, 0x00ff },
+		{ USBTV_BASE + 0x0127, 0x0060 },
+		{ USBTV_BASE + 0x00ae, 0x0030 },
+		{ USBTV_BASE + 0x0239, 0x0060 },
+	};
+
+	switch (input) {
+	case USBTV_COMPOSITE_INPUT:
+		ret = usbtv_set_regs(usbtv, composite, ARRAY_SIZE(composite));
+		break;
+	case USBTV_SVIDEO_INPUT:
+		ret = usbtv_set_regs(usbtv, svideo, ARRAY_SIZE(svideo));
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (!ret)
+		usbtv->input = input;
+
+	return ret;
+}
+
+static uint16_t usbtv_norm_to_16f_reg(v4l2_std_id norm)
+{
+	/* NTSC M/M-JP/M-KR */
+	if (norm & V4L2_STD_NTSC)
+		return 0x00b8;
+	/* PAL BG/DK/H/I */
+	if (norm & V4L2_STD_PAL)
+		return 0x00ee;
+	/* SECAM B/D/G/H/K/K1/L/Lc */
+	if (norm & V4L2_STD_SECAM)
+		return 0x00ff;
+	if (norm & V4L2_STD_NTSC_443)
+		return 0x00a8;
+	if (norm & (V4L2_STD_PAL_M | V4L2_STD_PAL_60))
+		return 0x00bc;
+	if (norm & V4L2_STD_PAL_Nc)
+		return 0x00fe;
+	/* Fallback to automatic detection for other standards */
+	return 0x0000;
+}
+
+static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
+{
+	int ret;
+	/* These are the series of register values used to configure the
+	 * decoder for a specific standard.
+	 * The first 21 register writes are copied from the
+	 * Settings\DecoderDefaults registry keys present in the Windows driver
+	 * .INF file, and control various image tuning parameters (color
+	 * correction, sharpness, ...).
+	 */
+	static const u16 pal[][2] = {
+		/* "AVPAL" tuning sequence from .INF file */
+		{ USBTV_BASE + 0x0003, 0x0004 },
+		{ USBTV_BASE + 0x001a, 0x0068 },
+		{ USBTV_BASE + 0x0100, 0x00d3 },
+		{ USBTV_BASE + 0x010e, 0x0072 },
+		{ USBTV_BASE + 0x010f, 0x00a2 },
+		{ USBTV_BASE + 0x0112, 0x00b0 },
+		{ USBTV_BASE + 0x0115, 0x0015 },
+		{ USBTV_BASE + 0x0117, 0x0001 },
+		{ USBTV_BASE + 0x0118, 0x002c },
+		{ USBTV_BASE + 0x012d, 0x0010 },
+		{ USBTV_BASE + 0x012f, 0x0020 },
+		{ USBTV_BASE + 0x0220, 0x002e },
+		{ USBTV_BASE + 0x0225, 0x0008 },
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+		{ USBTV_BASE + 0x0254, 0x0059 },
+		{ USBTV_BASE + 0x025a, 0x0016 },
+		{ USBTV_BASE + 0x025b, 0x0035 },
+		{ USBTV_BASE + 0x0263, 0x0017 },
+		{ USBTV_BASE + 0x0266, 0x0016 },
+		{ USBTV_BASE + 0x0267, 0x0036 },
+		/* End image tuning */
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+	};
+
+	static const u16 ntsc[][2] = {
+		/* "AVNTSC" tuning sequence from .INF file */
+		{ USBTV_BASE + 0x0003, 0x0004 },
+		{ USBTV_BASE + 0x001a, 0x0079 },
+		{ USBTV_BASE + 0x0100, 0x00d3 },
+		{ USBTV_BASE + 0x010e, 0x0068 },
+		{ USBTV_BASE + 0x010f, 0x009c },
+		{ USBTV_BASE + 0x0112, 0x00f0 },
+		{ USBTV_BASE + 0x0115, 0x0015 },
+		{ USBTV_BASE + 0x0117, 0x0000 },
+		{ USBTV_BASE + 0x0118, 0x00fc },
+		{ USBTV_BASE + 0x012d, 0x0004 },
+		{ USBTV_BASE + 0x012f, 0x0008 },
+		{ USBTV_BASE + 0x0220, 0x002e },
+		{ USBTV_BASE + 0x0225, 0x0008 },
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0001 },
+		{ USBTV_BASE + 0x0254, 0x005f },
+		{ USBTV_BASE + 0x025a, 0x0012 },
+		{ USBTV_BASE + 0x025b, 0x0001 },
+		{ USBTV_BASE + 0x0263, 0x001c },
+		{ USBTV_BASE + 0x0266, 0x0011 },
+		{ USBTV_BASE + 0x0267, 0x0005 },
+		/* End image tuning */
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+	};
+
+	static const u16 secam[][2] = {
+		/* "AVSECAM" tuning sequence from .INF file */
+		{ USBTV_BASE + 0x0003, 0x0004 },
+		{ USBTV_BASE + 0x001a, 0x0073 },
+		{ USBTV_BASE + 0x0100, 0x00dc },
+		{ USBTV_BASE + 0x010e, 0x0072 },
+		{ USBTV_BASE + 0x010f, 0x00a2 },
+		{ USBTV_BASE + 0x0112, 0x0090 },
+		{ USBTV_BASE + 0x0115, 0x0035 },
+		{ USBTV_BASE + 0x0117, 0x0001 },
+		{ USBTV_BASE + 0x0118, 0x0030 },
+		{ USBTV_BASE + 0x012d, 0x0004 },
+		{ USBTV_BASE + 0x012f, 0x0008 },
+		{ USBTV_BASE + 0x0220, 0x002d },
+		{ USBTV_BASE + 0x0225, 0x0028 },
+		{ USBTV_BASE + 0x024e, 0x0008 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+		{ USBTV_BASE + 0x0254, 0x0069 },
+		{ USBTV_BASE + 0x025a, 0x0016 },
+		{ USBTV_BASE + 0x025b, 0x0035 },
+		{ USBTV_BASE + 0x0263, 0x0021 },
+		{ USBTV_BASE + 0x0266, 0x0016 },
+		{ USBTV_BASE + 0x0267, 0x0036 },
+		/* End image tuning */
+		{ USBTV_BASE + 0x024e, 0x0002 },
+		{ USBTV_BASE + 0x024f, 0x0002 },
+	};
+
+	ret = usbtv_configure_for_norm(usbtv, norm);
+
+	if (!ret) {
+		/* Masks for norms using a NTSC or PAL color encoding. */
+		static const v4l2_std_id ntsc_mask =
+			V4L2_STD_NTSC | V4L2_STD_NTSC_443;
+		static const v4l2_std_id pal_mask =
+			V4L2_STD_PAL | V4L2_STD_PAL_60 | V4L2_STD_PAL_M |
+			V4L2_STD_PAL_Nc;
+
+		if (norm & ntsc_mask)
+			ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
+		else if (norm & pal_mask)
+			ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
+		else if (norm & V4L2_STD_SECAM)
+			ret = usbtv_set_regs(usbtv, secam, ARRAY_SIZE(secam));
+		else
+			ret = -EINVAL;
+	}
+
+	if (!ret) {
+		/* Configure the decoder for the color standard */
+		const u16 cfg[][2] = {
+			{ USBTV_BASE + 0x016f, usbtv_norm_to_16f_reg(norm) }
+		};
+		ret = usbtv_set_regs(usbtv, cfg, ARRAY_SIZE(cfg));
+	}
+
+	return ret;
+}
+
+static int usbtv_setup_capture(struct usbtv *usbtv)
+{
+	int ret;
+	static const u16 setup[][2] = {
+		/* These seem to enable the device. */
+		{ USBTV_BASE + 0x0008, 0x0001 },
+		{ USBTV_BASE + 0x01d0, 0x00ff },
+		{ USBTV_BASE + 0x01d9, 0x0002 },
+
+		/* These seem to influence color parameters, such as
+		 * brightness, etc. */
+		{ USBTV_BASE + 0x0239, 0x0040 },
+		{ USBTV_BASE + 0x0240, 0x0000 },
+		{ USBTV_BASE + 0x0241, 0x0000 },
+		{ USBTV_BASE + 0x0242, 0x0002 },
+		{ USBTV_BASE + 0x0243, 0x0080 },
+		{ USBTV_BASE + 0x0244, 0x0012 },
+		{ USBTV_BASE + 0x0245, 0x0090 },
+		{ USBTV_BASE + 0x0246, 0x0000 },
+
+		{ USBTV_BASE + 0x0278, 0x002d },
+		{ USBTV_BASE + 0x0279, 0x000a },
+		{ USBTV_BASE + 0x027a, 0x0032 },
+		{ 0xf890, 0x000c },
+		{ 0xf894, 0x0086 },
+
+		{ USBTV_BASE + 0x00ac, 0x00c0 },
+		{ USBTV_BASE + 0x00ad, 0x0000 },
+		{ USBTV_BASE + 0x00a2, 0x0012 },
+		{ USBTV_BASE + 0x00a3, 0x00e0 },
+		{ USBTV_BASE + 0x00a4, 0x0028 },
+		{ USBTV_BASE + 0x00a5, 0x0082 },
+		{ USBTV_BASE + 0x00a7, 0x0080 },
+		{ USBTV_BASE + 0x0000, 0x0014 },
+		{ USBTV_BASE + 0x0006, 0x0003 },
+		{ USBTV_BASE + 0x0090, 0x0099 },
+		{ USBTV_BASE + 0x0091, 0x0090 },
+		{ USBTV_BASE + 0x0094, 0x0068 },
+		{ USBTV_BASE + 0x0095, 0x0070 },
+		{ USBTV_BASE + 0x009c, 0x0030 },
+		{ USBTV_BASE + 0x009d, 0x00c0 },
+		{ USBTV_BASE + 0x009e, 0x00e0 },
+		{ USBTV_BASE + 0x0019, 0x0006 },
+		{ USBTV_BASE + 0x008c, 0x00ba },
+		{ USBTV_BASE + 0x0101, 0x00ff },
+		{ USBTV_BASE + 0x010c, 0x00b3 },
+		{ USBTV_BASE + 0x01b2, 0x0080 },
+		{ USBTV_BASE + 0x01b4, 0x00a0 },
+		{ USBTV_BASE + 0x014c, 0x00ff },
+		{ USBTV_BASE + 0x014d, 0x00ca },
+		{ USBTV_BASE + 0x0113, 0x0053 },
+		{ USBTV_BASE + 0x0119, 0x008a },
+		{ USBTV_BASE + 0x013c, 0x0003 },
+		{ USBTV_BASE + 0x0150, 0x009c },
+		{ USBTV_BASE + 0x0151, 0x0071 },
+		{ USBTV_BASE + 0x0152, 0x00c6 },
+		{ USBTV_BASE + 0x0153, 0x0084 },
+		{ USBTV_BASE + 0x0154, 0x00bc },
+		{ USBTV_BASE + 0x0155, 0x00a0 },
+		{ USBTV_BASE + 0x0156, 0x00a0 },
+		{ USBTV_BASE + 0x0157, 0x009c },
+		{ USBTV_BASE + 0x0158, 0x001f },
+		{ USBTV_BASE + 0x0159, 0x0006 },
+		{ USBTV_BASE + 0x015d, 0x0000 },
+	};
+
+	ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
+	if (ret)
+		return ret;
+
+	ret = usbtv_select_norm(usbtv, usbtv->norm);
+	if (ret)
+		return ret;
+
+	ret = usbtv_select_input(usbtv, usbtv->input);
+	if (ret)
+		return ret;
+
+	ret = v4l2_ctrl_handler_setup(&usbtv->ctrl);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* Copy data from chunk into a frame buffer, deinterlacing the data
+ * into every second line. Unfortunately, they don't align nicely into
+ * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
+ * Therefore, we break down the chunk into two halves before copying,
+ * so that we can interleave a line if needed.
+ *
+ * Each "chunk" is 240 words; a word in this context equals 4 bytes.
+ * Image format is YUYV/YUV 4:2:2, consisting of Y Cr Y Cb, defining two
+ * pixels, the Cr and Cb shared between the two pixels, but each having
+ * separate Y values. Thus, the 240 words equal 480 pixels. It therefore,
+ * takes 1.5 chunks to make a 720 pixel-wide line for the frame.
+ * The image is interlaced, so there is a "scan" of odd lines, followed
+ * by "scan" of even numbered lines.
+ *
+ * Following code is writing the chunks in correct sequence, skipping
+ * the rows based on "odd" value.
+ * line 1: chunk[0][  0..479] chunk[0][480..959] chunk[1][  0..479]
+ * line 3: chunk[1][480..959] chunk[2][  0..479] chunk[2][480..959]
+ * ...etc.
+ */
+static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd)
+{
+	int half;
+
+	for (half = 0; half < 2; half++) {
+		int part_no = chunk_no * 2 + half;
+		int line = part_no / 3;
+		int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
+
+		u32 *dst = &frame[part_index * USBTV_CHUNK/2];
+
+		memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
+		src += USBTV_CHUNK/2;
+	}
+}
+
+/* Called for each 256-byte image chunk.
+ * First word identifies the chunk, followed by 240 words of image
+ * data and padding. */
+static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
+{
+	int frame_id, odd, chunk_no;
+	u32 *frame;
+	struct usbtv_buf *buf;
+	unsigned long flags;
+
+	/* Ignore corrupted lines. */
+	if (!USBTV_MAGIC_OK(chunk))
+		return;
+	frame_id = USBTV_FRAME_ID(chunk);
+	odd = USBTV_ODD(chunk);
+	chunk_no = USBTV_CHUNK_NO(chunk);
+	if (chunk_no >= usbtv->n_chunks)
+		return;
+
+	/* Beginning of a frame. */
+	if (chunk_no == 0) {
+		usbtv->frame_id = frame_id;
+		usbtv->chunks_done = 0;
+	}
+
+	if (usbtv->frame_id != frame_id)
+		return;
+
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	if (list_empty(&usbtv->bufs)) {
+		/* No free buffers. Userspace likely too slow. */
+		spin_unlock_irqrestore(&usbtv->buflock, flags);
+		return;
+	}
+
+	/* First available buffer. */
+	buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
+	frame = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
+
+	/* Copy the chunk data. */
+	usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
+	usbtv->chunks_done++;
+
+	/* Last chunk in a field */
+	if (chunk_no == usbtv->n_chunks-1) {
+		/* Last chunk in a frame, signalling an end */
+		if (odd && !usbtv->last_odd) {
+			int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
+			enum vb2_buffer_state state = usbtv->chunks_done ==
+				usbtv->n_chunks ?
+				VB2_BUF_STATE_DONE :
+				VB2_BUF_STATE_ERROR;
+
+			buf->vb.field = V4L2_FIELD_INTERLACED;
+			buf->vb.sequence = usbtv->sequence++;
+			buf->vb.vb2_buf.timestamp = ktime_get_ns();
+			vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
+			vb2_buffer_done(&buf->vb.vb2_buf, state);
+			list_del(&buf->list);
+		}
+		usbtv->last_odd = odd;
+	}
+
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+/* Got image data. Each packet contains a number of 256-word chunks we
+ * compose the image from. */
+static void usbtv_iso_cb(struct urb *ip)
+{
+	int ret;
+	int i;
+	struct usbtv *usbtv = (struct usbtv *)ip->context;
+
+	switch (ip->status) {
+	/* All fine. */
+	case 0:
+		break;
+	/* Device disconnected or capture stopped? */
+	case -ENODEV:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		return;
+	/* Unknown error. Retry. */
+	default:
+		dev_warn(usbtv->dev, "Bad response for ISO request.\n");
+		goto resubmit;
+	}
+
+	for (i = 0; i < ip->number_of_packets; i++) {
+		int size = ip->iso_frame_desc[i].actual_length;
+		unsigned char *data = ip->transfer_buffer +
+				ip->iso_frame_desc[i].offset;
+		int offset;
+
+		for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
+			usbtv_image_chunk(usbtv,
+				(__be32 *)&data[USBTV_CHUNK_SIZE * offset]);
+	}
+
+resubmit:
+	ret = usb_submit_urb(ip, GFP_ATOMIC);
+	if (ret < 0)
+		dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
+}
+
+static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
+{
+	struct urb *ip;
+	int size = usbtv->iso_size;
+	int i;
+
+	ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
+	if (ip == NULL)
+		return NULL;
+
+	ip->dev = usbtv->udev;
+	ip->context = usbtv;
+	ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
+	ip->interval = 1;
+	ip->transfer_flags = URB_ISO_ASAP;
+	ip->transfer_buffer = kcalloc(USBTV_ISOC_PACKETS, size,
+						GFP_KERNEL);
+	if (!ip->transfer_buffer) {
+		usb_free_urb(ip);
+		return NULL;
+	}
+	ip->complete = usbtv_iso_cb;
+	ip->number_of_packets = USBTV_ISOC_PACKETS;
+	ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
+	for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
+		ip->iso_frame_desc[i].offset = size * i;
+		ip->iso_frame_desc[i].length = size;
+	}
+
+	return ip;
+}
+
+static void usbtv_stop(struct usbtv *usbtv)
+{
+	int i;
+	unsigned long flags;
+
+	/* Cancel running transfers. */
+	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
+		struct urb *ip = usbtv->isoc_urbs[i];
+
+		if (ip == NULL)
+			continue;
+		usb_kill_urb(ip);
+		kfree(ip->transfer_buffer);
+		usb_free_urb(ip);
+		usbtv->isoc_urbs[i] = NULL;
+	}
+
+	/* Return buffers to userspace. */
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	while (!list_empty(&usbtv->bufs)) {
+		struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
+						struct usbtv_buf, list);
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		list_del(&buf->list);
+	}
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+static int usbtv_start(struct usbtv *usbtv)
+{
+	int i;
+	int ret;
+
+	usbtv_audio_suspend(usbtv);
+
+	ret = usb_set_interface(usbtv->udev, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = usbtv_setup_capture(usbtv);
+	if (ret < 0)
+		return ret;
+
+	ret = usb_set_interface(usbtv->udev, 0, 1);
+	if (ret < 0)
+		return ret;
+
+	usbtv_audio_resume(usbtv);
+
+	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
+		struct urb *ip;
+
+		ip = usbtv_setup_iso_transfer(usbtv);
+		if (ip == NULL) {
+			ret = -ENOMEM;
+			goto start_fail;
+		}
+		usbtv->isoc_urbs[i] = ip;
+
+		ret = usb_submit_urb(ip, GFP_KERNEL);
+		if (ret < 0)
+			goto start_fail;
+	}
+
+	return 0;
+
+start_fail:
+	usbtv_stop(usbtv);
+	return ret;
+}
+
+static int usbtv_querycap(struct file *file, void *priv,
+				struct v4l2_capability *cap)
+{
+	struct usbtv *dev = video_drvdata(file);
+
+	strscpy(cap->driver, "usbtv", sizeof(cap->driver));
+	strscpy(cap->card, "usbtv", sizeof(cap->card));
+	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
+	return 0;
+}
+
+static int usbtv_enum_input(struct file *file, void *priv,
+					struct v4l2_input *i)
+{
+	struct usbtv *dev = video_drvdata(file);
+
+	switch (i->index) {
+	case USBTV_COMPOSITE_INPUT:
+		strscpy(i->name, "Composite", sizeof(i->name));
+		break;
+	case USBTV_SVIDEO_INPUT:
+		strscpy(i->name, "S-Video", sizeof(i->name));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+	i->std = dev->vdev.tvnorms;
+	return 0;
+}
+
+static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
+					struct v4l2_fmtdesc *f)
+{
+	if (f->index > 0)
+		return -EINVAL;
+
+	f->pixelformat = V4L2_PIX_FMT_YUYV;
+	return 0;
+}
+
+static int usbtv_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct usbtv *usbtv = video_drvdata(file);
+
+	f->fmt.pix.width = usbtv->width;
+	f->fmt.pix.height = usbtv->height;
+	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
+	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
+	f->fmt.pix.bytesperline = usbtv->width * 2;
+	f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+	return 0;
+}
+
+static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+	struct usbtv *usbtv = video_drvdata(file);
+	*norm = usbtv->norm;
+	return 0;
+}
+
+static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
+{
+	int ret = -EINVAL;
+	struct usbtv *usbtv = video_drvdata(file);
+
+	if (norm & USBTV_TV_STD)
+		ret = usbtv_select_norm(usbtv, norm);
+
+	return ret;
+}
+
+static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct usbtv *usbtv = video_drvdata(file);
+	*i = usbtv->input;
+	return 0;
+}
+
+static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
+{
+	struct usbtv *usbtv = video_drvdata(file);
+
+	return usbtv_select_input(usbtv, i);
+}
+
+static const struct v4l2_ioctl_ops usbtv_ioctl_ops = {
+	.vidioc_querycap = usbtv_querycap,
+	.vidioc_enum_input = usbtv_enum_input,
+	.vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
+	.vidioc_g_std = usbtv_g_std,
+	.vidioc_s_std = usbtv_s_std,
+	.vidioc_g_input = usbtv_g_input,
+	.vidioc_s_input = usbtv_s_input,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+static const struct v4l2_file_operations usbtv_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+};
+
+static int usbtv_queue_setup(struct vb2_queue *vq,
+	unsigned int *nbuffers,
+	unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vq);
+	unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
+
+	if (vq->num_buffers + *nbuffers < 2)
+		*nbuffers = 2 - vq->num_buffers;
+	if (*nplanes)
+		return sizes[0] < size ? -EINVAL : 0;
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static void usbtv_buf_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
+	struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb);
+	unsigned long flags;
+
+	if (usbtv->udev == NULL) {
+		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+		return;
+	}
+
+	spin_lock_irqsave(&usbtv->buflock, flags);
+	list_add_tail(&buf->list, &usbtv->bufs);
+	spin_unlock_irqrestore(&usbtv->buflock, flags);
+}
+
+static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vq);
+
+	if (usbtv->udev == NULL)
+		return -ENODEV;
+
+	usbtv->last_odd = 1;
+	usbtv->sequence = 0;
+	return usbtv_start(usbtv);
+}
+
+static void usbtv_stop_streaming(struct vb2_queue *vq)
+{
+	struct usbtv *usbtv = vb2_get_drv_priv(vq);
+
+	if (usbtv->udev)
+		usbtv_stop(usbtv);
+}
+
+static const struct vb2_ops usbtv_vb2_ops = {
+	.queue_setup = usbtv_queue_setup,
+	.buf_queue = usbtv_buf_queue,
+	.start_streaming = usbtv_start_streaming,
+	.stop_streaming = usbtv_stop_streaming,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+};
+
+static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct usbtv *usbtv = container_of(ctrl->handler, struct usbtv,
+								ctrl);
+	u8 *data;
+	u16 index, size;
+	int ret;
+
+	data = kmalloc(3, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	/*
+	 * Read in the current brightness/contrast registers. We need them
+	 * both, because the values are for some reason interleaved.
+	 */
+	if (ctrl->id == V4L2_CID_BRIGHTNESS || ctrl->id == V4L2_CID_CONTRAST) {
+		ret = usb_control_msg(usbtv->udev,
+			usb_rcvctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG,
+			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			0, USBTV_BASE + 0x0244, (void *)data, 3,
+			USB_CTRL_GET_TIMEOUT);
+		if (ret < 0)
+			goto error;
+	}
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		index = USBTV_BASE + 0x0244;
+		size = 3;
+		data[0] &= 0xf0;
+		data[0] |= (ctrl->val >> 8) & 0xf;
+		data[2] = ctrl->val & 0xff;
+		break;
+	case V4L2_CID_CONTRAST:
+		index = USBTV_BASE + 0x0244;
+		size = 3;
+		data[0] &= 0x0f;
+		data[0] |= (ctrl->val >> 4) & 0xf0;
+		data[1] = ctrl->val & 0xff;
+		break;
+	case V4L2_CID_SATURATION:
+		index = USBTV_BASE + 0x0242;
+		data[0] = ctrl->val >> 8;
+		data[1] = ctrl->val & 0xff;
+		size = 2;
+		break;
+	case V4L2_CID_HUE:
+		index = USBTV_BASE + 0x0240;
+		size = 2;
+		if (ctrl->val > 0) {
+			data[0] = 0x92 + (ctrl->val >> 8);
+			data[1] = ctrl->val & 0xff;
+		} else {
+			data[0] = 0x82 + (-ctrl->val >> 8);
+			data[1] = -ctrl->val & 0xff;
+		}
+		break;
+	case V4L2_CID_SHARPNESS:
+		index = USBTV_BASE + 0x0239;
+		data[0] = 0;
+		data[1] = ctrl->val;
+		size = 2;
+		break;
+	default:
+		kfree(data);
+		return -EINVAL;
+	}
+
+	ret = usb_control_msg(usbtv->udev, usb_sndctrlpipe(usbtv->udev, 0),
+			USBTV_CONTROL_REG,
+			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			0, index, (void *)data, size, USB_CTRL_SET_TIMEOUT);
+
+error:
+	if (ret < 0)
+		dev_warn(usbtv->dev, "Failed to submit a control request.\n");
+
+	kfree(data);
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops usbtv_ctrl_ops = {
+	.s_ctrl = usbtv_s_ctrl,
+};
+
+static void usbtv_release(struct v4l2_device *v4l2_dev)
+{
+	struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
+
+	v4l2_device_unregister(&usbtv->v4l2_dev);
+	v4l2_ctrl_handler_free(&usbtv->ctrl);
+	kfree(usbtv);
+}
+
+int usbtv_video_init(struct usbtv *usbtv)
+{
+	int ret;
+
+	(void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);
+
+	spin_lock_init(&usbtv->buflock);
+	mutex_init(&usbtv->v4l2_lock);
+	mutex_init(&usbtv->vb2q_lock);
+	INIT_LIST_HEAD(&usbtv->bufs);
+
+	/* videobuf2 structure */
+	usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
+	usbtv->vb2q.drv_priv = usbtv;
+	usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
+	usbtv->vb2q.ops = &usbtv_vb2_ops;
+	usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
+	usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	usbtv->vb2q.lock = &usbtv->vb2q_lock;
+	ret = vb2_queue_init(&usbtv->vb2q);
+	if (ret < 0) {
+		dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
+		return ret;
+	}
+
+	/* controls */
+	v4l2_ctrl_handler_init(&usbtv->ctrl, 4);
+	v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
+			V4L2_CID_CONTRAST, 0, 0x3ff, 1, 0x1d0);
+	v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
+			V4L2_CID_BRIGHTNESS, 0, 0x3ff, 1, 0x1c0);
+	v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
+			V4L2_CID_SATURATION, 0, 0x3ff, 1, 0x200);
+	v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
+			V4L2_CID_HUE, -0xdff, 0xdff, 1, 0x000);
+	v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
+			V4L2_CID_SHARPNESS, 0x0, 0xff, 1, 0x60);
+	ret = usbtv->ctrl.error;
+	if (ret < 0) {
+		dev_warn(usbtv->dev, "Could not initialize controls\n");
+		goto ctrl_fail;
+	}
+
+	/* v4l2 structure */
+	usbtv->v4l2_dev.ctrl_handler = &usbtv->ctrl;
+	usbtv->v4l2_dev.release = usbtv_release;
+	ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
+	if (ret < 0) {
+		dev_warn(usbtv->dev, "Could not register v4l2 device\n");
+		goto v4l2_fail;
+	}
+
+	/* Video structure */
+	strscpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
+	usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
+	usbtv->vdev.release = video_device_release_empty;
+	usbtv->vdev.fops = &usbtv_fops;
+	usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
+	usbtv->vdev.tvnorms = USBTV_TV_STD;
+	usbtv->vdev.queue = &usbtv->vb2q;
+	usbtv->vdev.lock = &usbtv->v4l2_lock;
+	usbtv->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+				  V4L2_CAP_STREAMING;
+	video_set_drvdata(&usbtv->vdev, usbtv);
+	ret = video_register_device(&usbtv->vdev, VFL_TYPE_VIDEO, -1);
+	if (ret < 0) {
+		dev_warn(usbtv->dev, "Could not register video device\n");
+		goto vdev_fail;
+	}
+
+	return 0;
+
+vdev_fail:
+	v4l2_device_unregister(&usbtv->v4l2_dev);
+v4l2_fail:
+ctrl_fail:
+	v4l2_ctrl_handler_free(&usbtv->ctrl);
+
+	return ret;
+}
+
+void usbtv_video_free(struct usbtv *usbtv)
+{
+	mutex_lock(&usbtv->vb2q_lock);
+	mutex_lock(&usbtv->v4l2_lock);
+
+	usbtv_stop(usbtv);
+	vb2_video_unregister_device(&usbtv->vdev);
+	v4l2_device_disconnect(&usbtv->v4l2_dev);
+
+	mutex_unlock(&usbtv->v4l2_lock);
+	mutex_unlock(&usbtv->vb2q_lock);
+
+	v4l2_device_put(&usbtv->v4l2_dev);
+}