Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 1018 insertions, 0 deletions

diff --git a/drivers/media/pci/tw68/tw68-video.c b/drivers/media/pci/tw68/tw68-video.c
new file mode 100644
index 0000000000..773a18702d
--- /dev/null
+++ b/drivers/media/pci/tw68/tw68-video.c
@@ -0,0 +1,1018 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  tw68 functions to handle video data
+ *
+ *  Much of this code is derived from the cx88 and sa7134 drivers, which
+ *  were in turn derived from the bt87x driver.  The original work was by
+ *  Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab,
+ *  Hans Verkuil, Andy Walls and many others.  Their work is gratefully
+ *  acknowledged.  Full credit goes to them - any problems within this code
+ *  are mine.
+ *
+ *  Copyright (C) 2009  William M. Brack
+ *
+ *  Refactored and updated to the latest v4l core frameworks:
+ *
+ *  Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl>
+ */
+
+#include <linux/module.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-dma-sg.h>
+
+#include "tw68.h"
+#include "tw68-reg.h"
+
+/* ------------------------------------------------------------------ */
+/* data structs for video                                             */
+/*
+ * FIXME -
+ * Note that the saa7134 has formats, e.g. YUV420, which are classified
+ * as "planar".  These affect overlay mode, and are flagged with a field
+ * ".planar" in the format.  Do we need to implement this in this driver?
+ */
+static const struct tw68_format formats[] = {
+	{
+		.fourcc		= V4L2_PIX_FMT_RGB555,
+		.depth		= 16,
+		.twformat	= ColorFormatRGB15,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB555X,
+		.depth		= 16,
+		.twformat	= ColorFormatRGB15 | ColorFormatBSWAP,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB565,
+		.depth		= 16,
+		.twformat	= ColorFormatRGB16,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB565X,
+		.depth		= 16,
+		.twformat	= ColorFormatRGB16 | ColorFormatBSWAP,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_BGR24,
+		.depth		= 24,
+		.twformat	= ColorFormatRGB24,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB24,
+		.depth		= 24,
+		.twformat	= ColorFormatRGB24 | ColorFormatBSWAP,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_BGR32,
+		.depth		= 32,
+		.twformat	= ColorFormatRGB32,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_RGB32,
+		.depth		= 32,
+		.twformat	= ColorFormatRGB32 | ColorFormatBSWAP |
+				  ColorFormatWSWAP,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_YUYV,
+		.depth		= 16,
+		.twformat	= ColorFormatYUY2,
+	}, {
+		.fourcc		= V4L2_PIX_FMT_UYVY,
+		.depth		= 16,
+		.twformat	= ColorFormatYUY2 | ColorFormatBSWAP,
+	}
+};
+#define FORMATS ARRAY_SIZE(formats)
+
+#define NORM_625_50			\
+		.h_delay	= 3,	\
+		.h_delay0	= 133,	\
+		.h_start	= 0,	\
+		.h_stop		= 719,	\
+		.v_delay	= 24,	\
+		.vbi_v_start_0	= 7,	\
+		.vbi_v_stop_0	= 22,	\
+		.video_v_start	= 24,	\
+		.video_v_stop	= 311,	\
+		.vbi_v_start_1	= 319
+
+#define NORM_525_60			\
+		.h_delay	= 8,	\
+		.h_delay0	= 138,	\
+		.h_start	= 0,	\
+		.h_stop		= 719,	\
+		.v_delay	= 22,	\
+		.vbi_v_start_0	= 10,	\
+		.vbi_v_stop_0	= 21,	\
+		.video_v_start	= 22,	\
+		.video_v_stop	= 262,	\
+		.vbi_v_start_1	= 273
+
+/*
+ * The following table is searched by tw68_s_std, first for a specific
+ * match, then for an entry which contains the desired id.  The table
+ * entries should therefore be ordered in ascending order of specificity.
+ */
+static const struct tw68_tvnorm tvnorms[] = {
+	{
+		.name		= "PAL", /* autodetect */
+		.id		= V4L2_STD_PAL,
+		NORM_625_50,
+
+		.sync_control	= 0x18,
+		.luma_control	= 0x40,
+		.chroma_ctrl1	= 0x81,
+		.chroma_gain	= 0x2a,
+		.chroma_ctrl2	= 0x06,
+		.vgate_misc	= 0x1c,
+		.format		= VideoFormatPALBDGHI,
+	}, {
+		.name		= "NTSC",
+		.id		= V4L2_STD_NTSC,
+		NORM_525_60,
+
+		.sync_control	= 0x59,
+		.luma_control	= 0x40,
+		.chroma_ctrl1	= 0x89,
+		.chroma_gain	= 0x2a,
+		.chroma_ctrl2	= 0x0e,
+		.vgate_misc	= 0x18,
+		.format		= VideoFormatNTSC,
+	}, {
+		.name		= "SECAM",
+		.id		= V4L2_STD_SECAM,
+		NORM_625_50,
+
+		.sync_control	= 0x18,
+		.luma_control	= 0x1b,
+		.chroma_ctrl1	= 0xd1,
+		.chroma_gain	= 0x80,
+		.chroma_ctrl2	= 0x00,
+		.vgate_misc	= 0x1c,
+		.format		= VideoFormatSECAM,
+	}, {
+		.name		= "PAL-M",
+		.id		= V4L2_STD_PAL_M,
+		NORM_525_60,
+
+		.sync_control	= 0x59,
+		.luma_control	= 0x40,
+		.chroma_ctrl1	= 0xb9,
+		.chroma_gain	= 0x2a,
+		.chroma_ctrl2	= 0x0e,
+		.vgate_misc	= 0x18,
+		.format		= VideoFormatPALM,
+	}, {
+		.name		= "PAL-Nc",
+		.id		= V4L2_STD_PAL_Nc,
+		NORM_625_50,
+
+		.sync_control	= 0x18,
+		.luma_control	= 0x40,
+		.chroma_ctrl1	= 0xa1,
+		.chroma_gain	= 0x2a,
+		.chroma_ctrl2	= 0x06,
+		.vgate_misc	= 0x1c,
+		.format		= VideoFormatPALNC,
+	}, {
+		.name		= "PAL-60",
+		.id		= V4L2_STD_PAL_60,
+		.h_delay	= 186,
+		.h_start	= 0,
+		.h_stop		= 719,
+		.v_delay	= 26,
+		.video_v_start	= 23,
+		.video_v_stop	= 262,
+		.vbi_v_start_0	= 10,
+		.vbi_v_stop_0	= 21,
+		.vbi_v_start_1	= 273,
+
+		.sync_control	= 0x18,
+		.luma_control	= 0x40,
+		.chroma_ctrl1	= 0x81,
+		.chroma_gain	= 0x2a,
+		.chroma_ctrl2	= 0x06,
+		.vgate_misc	= 0x1c,
+		.format		= VideoFormatPAL60,
+	}
+};
+#define TVNORMS ARRAY_SIZE(tvnorms)
+
+static const struct tw68_format *format_by_fourcc(unsigned int fourcc)
+{
+	unsigned int i;
+
+	for (i = 0; i < FORMATS; i++)
+		if (formats[i].fourcc == fourcc)
+			return formats+i;
+	return NULL;
+}
+
+
+/* ------------------------------------------------------------------ */
+/*
+ * Note that the cropping rectangles are described in terms of a single
+ * frame, i.e. line positions are only 1/2 the interlaced equivalent
+ */
+static void set_tvnorm(struct tw68_dev *dev, const struct tw68_tvnorm *norm)
+{
+	if (norm != dev->tvnorm) {
+		dev->width = 720;
+		dev->height = (norm->id & V4L2_STD_525_60) ? 480 : 576;
+		dev->tvnorm = norm;
+		tw68_set_tvnorm_hw(dev);
+	}
+}
+
+/*
+ * tw68_set_scale
+ *
+ * Scaling and Cropping for video decoding
+ *
+ * We are working with 3 values for horizontal and vertical - scale,
+ * delay and active.
+ *
+ * HACTIVE represent the actual number of pixels in the "usable" image,
+ * before scaling.  HDELAY represents the number of pixels skipped
+ * between the start of the horizontal sync and the start of the image.
+ * HSCALE is calculated using the formula
+ *	HSCALE = (HACTIVE / (#pixels desired)) * 256
+ *
+ * The vertical registers are similar, except based upon the total number
+ * of lines in the image, and the first line of the image (i.e. ignoring
+ * vertical sync and VBI).
+ *
+ * Note that the number of bytes reaching the FIFO (and hence needing
+ * to be processed by the DMAP program) is completely dependent upon
+ * these values, especially HSCALE.
+ *
+ * Parameters:
+ *	@dev		pointer to the device structure, needed for
+ *			getting current norm (as well as debug print)
+ *	@width		actual image width (from user buffer)
+ *	@height		actual image height
+ *	@field		indicates Top, Bottom or Interlaced
+ */
+static int tw68_set_scale(struct tw68_dev *dev, unsigned int width,
+			  unsigned int height, enum v4l2_field field)
+{
+	const struct tw68_tvnorm *norm = dev->tvnorm;
+	/* set individually for debugging clarity */
+	int hactive, hdelay, hscale;
+	int vactive, vdelay, vscale;
+	int comb;
+
+	if (V4L2_FIELD_HAS_BOTH(field))	/* if field is interlaced */
+		height /= 2;		/* we must set for 1-frame */
+
+	pr_debug("%s: width=%d, height=%d, both=%d\n"
+		 "  tvnorm h_delay=%d, h_start=%d, h_stop=%d, v_delay=%d, v_start=%d, v_stop=%d\n",
+		__func__, width, height, V4L2_FIELD_HAS_BOTH(field),
+		norm->h_delay, norm->h_start, norm->h_stop,
+		norm->v_delay, norm->video_v_start,
+		norm->video_v_stop);
+
+	switch (dev->vdecoder) {
+	case TW6800:
+		hdelay = norm->h_delay0;
+		break;
+	default:
+		hdelay = norm->h_delay;
+		break;
+	}
+
+	hdelay += norm->h_start;
+	hactive = norm->h_stop - norm->h_start + 1;
+
+	hscale = (hactive * 256) / (width);
+
+	vdelay = norm->v_delay;
+	vactive = ((norm->id & V4L2_STD_525_60) ? 524 : 624) / 2 - norm->video_v_start;
+	vscale = (vactive * 256) / height;
+
+	pr_debug("%s: %dx%d [%s%s,%s]\n", __func__,
+		width, height,
+		V4L2_FIELD_HAS_TOP(field)    ? "T" : "",
+		V4L2_FIELD_HAS_BOTTOM(field) ? "B" : "",
+		v4l2_norm_to_name(dev->tvnorm->id));
+	pr_debug("%s: hactive=%d, hdelay=%d, hscale=%d; vactive=%d, vdelay=%d, vscale=%d\n",
+		 __func__,
+		hactive, hdelay, hscale, vactive, vdelay, vscale);
+
+	comb =	((vdelay & 0x300)  >> 2) |
+		((vactive & 0x300) >> 4) |
+		((hdelay & 0x300)  >> 6) |
+		((hactive & 0x300) >> 8);
+	pr_debug("%s: setting CROP_HI=%02x, VDELAY_LO=%02x, VACTIVE_LO=%02x, HDELAY_LO=%02x, HACTIVE_LO=%02x\n",
+		__func__, comb, vdelay, vactive, hdelay, hactive);
+	tw_writeb(TW68_CROP_HI, comb);
+	tw_writeb(TW68_VDELAY_LO, vdelay & 0xff);
+	tw_writeb(TW68_VACTIVE_LO, vactive & 0xff);
+	tw_writeb(TW68_HDELAY_LO, hdelay & 0xff);
+	tw_writeb(TW68_HACTIVE_LO, hactive & 0xff);
+
+	comb = ((vscale & 0xf00) >> 4) | ((hscale & 0xf00) >> 8);
+	pr_debug("%s: setting SCALE_HI=%02x, VSCALE_LO=%02x, HSCALE_LO=%02x\n",
+		 __func__, comb, vscale, hscale);
+	tw_writeb(TW68_SCALE_HI, comb);
+	tw_writeb(TW68_VSCALE_LO, vscale);
+	tw_writeb(TW68_HSCALE_LO, hscale);
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+int tw68_video_start_dma(struct tw68_dev *dev, struct tw68_buf *buf)
+{
+	/* Set cropping and scaling */
+	tw68_set_scale(dev, dev->width, dev->height, dev->field);
+	/*
+	 *  Set start address for RISC program.  Note that if the DMAP
+	 *  processor is currently running, it must be stopped before
+	 *  a new address can be set.
+	 */
+	tw_clearl(TW68_DMAC, TW68_DMAP_EN);
+	tw_writel(TW68_DMAP_SA, buf->dma);
+	/* Clear any pending interrupts */
+	tw_writel(TW68_INTSTAT, dev->board_virqmask);
+	/* Enable the risc engine and the fifo */
+	tw_andorl(TW68_DMAC, 0xff, dev->fmt->twformat |
+		ColorFormatGamma | TW68_DMAP_EN | TW68_FIFO_EN);
+	dev->pci_irqmask |= dev->board_virqmask;
+	tw_setl(TW68_INTMASK, dev->pci_irqmask);
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+/* calc max # of buffers from size (must not exceed the 4MB virtual
+ * address space per DMA channel) */
+static int tw68_buffer_count(unsigned int size, unsigned int count)
+{
+	unsigned int maxcount;
+
+	maxcount = (4 * 1024 * 1024) / roundup(size, PAGE_SIZE);
+	if (count > maxcount)
+		count = maxcount;
+	return count;
+}
+
+/* ------------------------------------------------------------- */
+/* vb2 queue operations                                          */
+
+static int tw68_queue_setup(struct vb2_queue *q,
+			   unsigned int *num_buffers, unsigned int *num_planes,
+			   unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct tw68_dev *dev = vb2_get_drv_priv(q);
+	unsigned tot_bufs = q->num_buffers + *num_buffers;
+	unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;
+
+	if (tot_bufs < 2)
+		tot_bufs = 2;
+	tot_bufs = tw68_buffer_count(size, tot_bufs);
+	*num_buffers = tot_bufs - q->num_buffers;
+	/*
+	 * We allow create_bufs, but only if the sizeimage is >= as the
+	 * current sizeimage. The tw68_buffer_count calculation becomes quite
+	 * difficult otherwise.
+	 */
+	if (*num_planes)
+		return sizes[0] < size ? -EINVAL : 0;
+	*num_planes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+/*
+ * The risc program for each buffers works as follows: it starts with a simple
+ * 'JUMP to addr + 8', which is effectively a NOP. Then the program to DMA the
+ * buffer follows and at the end we have a JUMP back to the start + 8 (skipping
+ * the initial JUMP).
+ *
+ * This is the program of the first buffer to be queued if the active list is
+ * empty and it just keeps DMAing this buffer without generating any interrupts.
+ *
+ * If a new buffer is added then the initial JUMP in the program generates an
+ * interrupt as well which signals that the previous buffer has been DMAed
+ * successfully and that it can be returned to userspace.
+ *
+ * It also sets the final jump of the previous buffer to the start of the new
+ * buffer, thus chaining the new buffer into the DMA chain. This is a single
+ * atomic u32 write, so there is no race condition.
+ *
+ * The end-result of all this that you only get an interrupt when a buffer
+ * is ready, so the control flow is very easy.
+ */
+static void tw68_buf_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct vb2_queue *vq = vb->vb2_queue;
+	struct tw68_dev *dev = vb2_get_drv_priv(vq);
+	struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
+	struct tw68_buf *prev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->slock, flags);
+
+	/* append a 'JUMP to start of buffer' to the buffer risc program */
+	buf->jmp[0] = cpu_to_le32(RISC_JUMP);
+	buf->jmp[1] = cpu_to_le32(buf->dma + 8);
+
+	if (!list_empty(&dev->active)) {
+		prev = list_entry(dev->active.prev, struct tw68_buf, list);
+		buf->cpu[0] |= cpu_to_le32(RISC_INT_BIT);
+		prev->jmp[1] = cpu_to_le32(buf->dma);
+	}
+	list_add_tail(&buf->list, &dev->active);
+	spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+/*
+ * buffer_prepare
+ *
+ * Set the ancillary information into the buffer structure.  This
+ * includes generating the necessary risc program if it hasn't already
+ * been done for the current buffer format.
+ * The structure fh contains the details of the format requested by the
+ * user - type, width, height and #fields.  This is compared with the
+ * last format set for the current buffer.  If they differ, the risc
+ * code (which controls the filling of the buffer) is (re-)generated.
+ */
+static int tw68_buf_prepare(struct vb2_buffer *vb)
+{
+	int ret;
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct vb2_queue *vq = vb->vb2_queue;
+	struct tw68_dev *dev = vb2_get_drv_priv(vq);
+	struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
+	struct sg_table *dma = vb2_dma_sg_plane_desc(vb, 0);
+	unsigned size, bpl;
+
+	size = (dev->width * dev->height * dev->fmt->depth) >> 3;
+	if (vb2_plane_size(vb, 0) < size)
+		return -EINVAL;
+	vb2_set_plane_payload(vb, 0, size);
+
+	bpl = (dev->width * dev->fmt->depth) >> 3;
+	switch (dev->field) {
+	case V4L2_FIELD_TOP:
+		ret = tw68_risc_buffer(dev->pci, buf, dma->sgl,
+				 0, UNSET, bpl, 0, dev->height);
+		break;
+	case V4L2_FIELD_BOTTOM:
+		ret = tw68_risc_buffer(dev->pci, buf, dma->sgl,
+				 UNSET, 0, bpl, 0, dev->height);
+		break;
+	case V4L2_FIELD_SEQ_TB:
+		ret = tw68_risc_buffer(dev->pci, buf, dma->sgl,
+				 0, bpl * (dev->height >> 1),
+				 bpl, 0, dev->height >> 1);
+		break;
+	case V4L2_FIELD_SEQ_BT:
+		ret = tw68_risc_buffer(dev->pci, buf, dma->sgl,
+				 bpl * (dev->height >> 1), 0,
+				 bpl, 0, dev->height >> 1);
+		break;
+	case V4L2_FIELD_INTERLACED:
+	default:
+		ret = tw68_risc_buffer(dev->pci, buf, dma->sgl,
+				 0, bpl, bpl, bpl, dev->height >> 1);
+		break;
+	}
+	return ret;
+}
+
+static void tw68_buf_finish(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct vb2_queue *vq = vb->vb2_queue;
+	struct tw68_dev *dev = vb2_get_drv_priv(vq);
+	struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
+
+	if (buf->cpu)
+		dma_free_coherent(&dev->pci->dev, buf->size, buf->cpu, buf->dma);
+}
+
+static int tw68_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	struct tw68_dev *dev = vb2_get_drv_priv(q);
+	struct tw68_buf *buf =
+		container_of(dev->active.next, struct tw68_buf, list);
+
+	dev->seqnr = 0;
+	tw68_video_start_dma(dev, buf);
+	return 0;
+}
+
+static void tw68_stop_streaming(struct vb2_queue *q)
+{
+	struct tw68_dev *dev = vb2_get_drv_priv(q);
+
+	/* Stop risc & fifo */
+	tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN);
+	while (!list_empty(&dev->active)) {
+		struct tw68_buf *buf =
+			container_of(dev->active.next, struct tw68_buf, list);
+
+		list_del(&buf->list);
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	}
+}
+
+static const struct vb2_ops tw68_video_qops = {
+	.queue_setup	= tw68_queue_setup,
+	.buf_queue	= tw68_buf_queue,
+	.buf_prepare	= tw68_buf_prepare,
+	.buf_finish	= tw68_buf_finish,
+	.start_streaming = tw68_start_streaming,
+	.stop_streaming = tw68_stop_streaming,
+	.wait_prepare	= vb2_ops_wait_prepare,
+	.wait_finish	= vb2_ops_wait_finish,
+};
+
+/* ------------------------------------------------------------------ */
+
+static int tw68_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct tw68_dev *dev =
+		container_of(ctrl->handler, struct tw68_dev, hdl);
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		tw_writeb(TW68_BRIGHT, ctrl->val);
+		break;
+	case V4L2_CID_HUE:
+		tw_writeb(TW68_HUE, ctrl->val);
+		break;
+	case V4L2_CID_CONTRAST:
+		tw_writeb(TW68_CONTRAST, ctrl->val);
+		break;
+	case V4L2_CID_SATURATION:
+		tw_writeb(TW68_SAT_U, ctrl->val);
+		tw_writeb(TW68_SAT_V, ctrl->val);
+		break;
+	case V4L2_CID_COLOR_KILLER:
+		if (ctrl->val)
+			tw_andorb(TW68_MISC2, 0xe0, 0xe0);
+		else
+			tw_andorb(TW68_MISC2, 0xe0, 0x00);
+		break;
+	case V4L2_CID_CHROMA_AGC:
+		if (ctrl->val)
+			tw_andorb(TW68_LOOP, 0x30, 0x20);
+		else
+			tw_andorb(TW68_LOOP, 0x30, 0x00);
+		break;
+	}
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+/*
+ * Note that this routine returns what is stored in the fh structure, and
+ * does not interrogate any of the device registers.
+ */
+static int tw68_g_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	f->fmt.pix.width        = dev->width;
+	f->fmt.pix.height       = dev->height;
+	f->fmt.pix.field        = dev->field;
+	f->fmt.pix.pixelformat  = dev->fmt->fourcc;
+	f->fmt.pix.bytesperline =
+		(f->fmt.pix.width * (dev->fmt->depth)) >> 3;
+	f->fmt.pix.sizeimage =
+		f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace	= V4L2_COLORSPACE_SMPTE170M;
+	return 0;
+}
+
+static int tw68_try_fmt_vid_cap(struct file *file, void *priv,
+						struct v4l2_format *f)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+	const struct tw68_format *fmt;
+	enum v4l2_field field;
+	unsigned int maxh;
+
+	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+	if (NULL == fmt)
+		return -EINVAL;
+
+	field = f->fmt.pix.field;
+	maxh  = (dev->tvnorm->id & V4L2_STD_525_60) ? 480 : 576;
+
+	switch (field) {
+	case V4L2_FIELD_TOP:
+	case V4L2_FIELD_BOTTOM:
+		break;
+	case V4L2_FIELD_INTERLACED:
+	case V4L2_FIELD_SEQ_BT:
+	case V4L2_FIELD_SEQ_TB:
+		maxh = maxh * 2;
+		break;
+	default:
+		field = (f->fmt.pix.height > maxh / 2)
+			? V4L2_FIELD_INTERLACED
+			: V4L2_FIELD_BOTTOM;
+		break;
+	}
+
+	f->fmt.pix.field = field;
+	if (f->fmt.pix.width  < 48)
+		f->fmt.pix.width  = 48;
+	if (f->fmt.pix.height < 32)
+		f->fmt.pix.height = 32;
+	if (f->fmt.pix.width > 720)
+		f->fmt.pix.width = 720;
+	if (f->fmt.pix.height > maxh)
+		f->fmt.pix.height = maxh;
+	f->fmt.pix.width &= ~0x03;
+	f->fmt.pix.bytesperline =
+		(f->fmt.pix.width * (fmt->depth)) >> 3;
+	f->fmt.pix.sizeimage =
+		f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
+	return 0;
+}
+
+/*
+ * Note that tw68_s_fmt_vid_cap sets the information into the fh structure,
+ * and it will be used for all future new buffers.  However, there could be
+ * some number of buffers on the "active" chain which will be filled before
+ * the change takes place.
+ */
+static int tw68_s_fmt_vid_cap(struct file *file, void *priv,
+					struct v4l2_format *f)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+	int err;
+
+	err = tw68_try_fmt_vid_cap(file, priv, f);
+	if (0 != err)
+		return err;
+
+	dev->fmt = format_by_fourcc(f->fmt.pix.pixelformat);
+	dev->width = f->fmt.pix.width;
+	dev->height = f->fmt.pix.height;
+	dev->field = f->fmt.pix.field;
+	return 0;
+}
+
+static int tw68_enum_input(struct file *file, void *priv,
+					struct v4l2_input *i)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+	unsigned int n;
+
+	n = i->index;
+	if (n >= TW68_INPUT_MAX)
+		return -EINVAL;
+	i->index = n;
+	i->type = V4L2_INPUT_TYPE_CAMERA;
+	snprintf(i->name, sizeof(i->name), "Composite %d", n);
+
+	/* If the query is for the current input, get live data */
+	if (n == dev->input) {
+		int v1 = tw_readb(TW68_STATUS1);
+		int v2 = tw_readb(TW68_MVSN);
+
+		if (0 != (v1 & (1 << 7)))
+			i->status |= V4L2_IN_ST_NO_SYNC;
+		if (0 != (v1 & (1 << 6)))
+			i->status |= V4L2_IN_ST_NO_H_LOCK;
+		if (0 != (v1 & (1 << 2)))
+			i->status |= V4L2_IN_ST_NO_SIGNAL;
+		if (0 != (v1 & 1 << 1))
+			i->status |= V4L2_IN_ST_NO_COLOR;
+		if (0 != (v2 & (1 << 2)))
+			i->status |= V4L2_IN_ST_MACROVISION;
+	}
+	i->std = video_devdata(file)->tvnorms;
+	return 0;
+}
+
+static int tw68_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	*i = dev->input;
+	return 0;
+}
+
+static int tw68_s_input(struct file *file, void *priv, unsigned int i)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	if (i >= TW68_INPUT_MAX)
+		return -EINVAL;
+	dev->input = i;
+	tw_andorb(TW68_INFORM, 0x03 << 2, dev->input << 2);
+	return 0;
+}
+
+static int tw68_querycap(struct file *file, void  *priv,
+					struct v4l2_capability *cap)
+{
+	strscpy(cap->driver, "tw68", sizeof(cap->driver));
+	strscpy(cap->card, "Techwell Capture Card",
+		sizeof(cap->card));
+	return 0;
+}
+
+static int tw68_s_std(struct file *file, void *priv, v4l2_std_id id)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+	unsigned int i;
+
+	if (vb2_is_busy(&dev->vidq))
+		return -EBUSY;
+
+	/* Look for match on complete norm id (may have mult bits) */
+	for (i = 0; i < TVNORMS; i++) {
+		if (id == tvnorms[i].id)
+			break;
+	}
+
+	/* If no exact match, look for norm which contains this one */
+	if (i == TVNORMS) {
+		for (i = 0; i < TVNORMS; i++)
+			if (id & tvnorms[i].id)
+				break;
+	}
+	/* If still not matched, give up */
+	if (i == TVNORMS)
+		return -EINVAL;
+
+	set_tvnorm(dev, &tvnorms[i]);	/* do the actual setting */
+	return 0;
+}
+
+static int tw68_g_std(struct file *file, void *priv, v4l2_std_id *id)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	*id = dev->tvnorm->id;
+	return 0;
+}
+
+static int tw68_enum_fmt_vid_cap(struct file *file, void  *priv,
+					struct v4l2_fmtdesc *f)
+{
+	if (f->index >= FORMATS)
+		return -EINVAL;
+
+	f->pixelformat = formats[f->index].fourcc;
+
+	return 0;
+}
+
+/*
+ * Used strictly for internal development and debugging, this routine
+ * prints out the current register contents for the tw68xx device.
+ */
+static void tw68_dump_regs(struct tw68_dev *dev)
+{
+	unsigned char line[80];
+	int i, j, k;
+	unsigned char *cptr;
+
+	pr_info("Full dump of TW68 registers:\n");
+	/* First we do the PCI regs, 8 4-byte regs per line */
+	for (i = 0; i < 0x100; i += 32) {
+		cptr = line;
+		cptr += sprintf(cptr, "%03x  ", i);
+		/* j steps through the next 4 words */
+		for (j = i; j < i + 16; j += 4)
+			cptr += sprintf(cptr, "%08x ", tw_readl(j));
+		*cptr++ = ' ';
+		for (; j < i + 32; j += 4)
+			cptr += sprintf(cptr, "%08x ", tw_readl(j));
+		*cptr++ = '\n';
+		*cptr = 0;
+		pr_info("%s", line);
+	}
+	/* Next the control regs, which are single-byte, address mod 4 */
+	while (i < 0x400) {
+		cptr = line;
+		cptr += sprintf(cptr, "%03x ", i);
+		/* Print out 4 groups of 4 bytes */
+		for (j = 0; j < 4; j++) {
+			for (k = 0; k < 4; k++) {
+				cptr += sprintf(cptr, "%02x ",
+					tw_readb(i));
+				i += 4;
+			}
+			*cptr++ = ' ';
+		}
+		*cptr++ = '\n';
+		*cptr = 0;
+		pr_info("%s", line);
+	}
+}
+
+static int vidioc_log_status(struct file *file, void *priv)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	tw68_dump_regs(dev);
+	return v4l2_ctrl_log_status(file, priv);
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int vidioc_g_register(struct file *file, void *priv,
+			      struct v4l2_dbg_register *reg)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	if (reg->size == 1)
+		reg->val = tw_readb(reg->reg);
+	else
+		reg->val = tw_readl(reg->reg);
+	return 0;
+}
+
+static int vidioc_s_register(struct file *file, void *priv,
+				const struct v4l2_dbg_register *reg)
+{
+	struct tw68_dev *dev = video_drvdata(file);
+
+	if (reg->size == 1)
+		tw_writeb(reg->reg, reg->val);
+	else
+		tw_writel(reg->reg & 0xffff, reg->val);
+	return 0;
+}
+#endif
+
+static const struct v4l2_ctrl_ops tw68_ctrl_ops = {
+	.s_ctrl = tw68_s_ctrl,
+};
+
+static const struct v4l2_file_operations video_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,
+};
+
+static const struct v4l2_ioctl_ops video_ioctl_ops = {
+	.vidioc_querycap		= tw68_querycap,
+	.vidioc_enum_fmt_vid_cap	= tw68_enum_fmt_vid_cap,
+	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
+	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
+	.vidioc_querybuf		= vb2_ioctl_querybuf,
+	.vidioc_qbuf			= vb2_ioctl_qbuf,
+	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
+	.vidioc_s_std			= tw68_s_std,
+	.vidioc_g_std			= tw68_g_std,
+	.vidioc_enum_input		= tw68_enum_input,
+	.vidioc_g_input			= tw68_g_input,
+	.vidioc_s_input			= tw68_s_input,
+	.vidioc_streamon		= vb2_ioctl_streamon,
+	.vidioc_streamoff		= vb2_ioctl_streamoff,
+	.vidioc_g_fmt_vid_cap		= tw68_g_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap		= tw68_try_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap		= tw68_s_fmt_vid_cap,
+	.vidioc_log_status		= vidioc_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
+};
+
+static const struct video_device tw68_video_template = {
+	.name			= "tw68_video",
+	.fops			= &video_fops,
+	.ioctl_ops		= &video_ioctl_ops,
+	.release		= video_device_release_empty,
+	.tvnorms		= TW68_NORMS,
+	.device_caps		= V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+				  V4L2_CAP_STREAMING,
+};
+
+/* ------------------------------------------------------------------ */
+/* exported stuff                                                     */
+void tw68_set_tvnorm_hw(struct tw68_dev *dev)
+{
+	tw_andorb(TW68_SDT, 0x07, dev->tvnorm->format);
+}
+
+int tw68_video_init1(struct tw68_dev *dev)
+{
+	struct v4l2_ctrl_handler *hdl = &dev->hdl;
+
+	v4l2_ctrl_handler_init(hdl, 6);
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_BRIGHTNESS, -128, 127, 1, 20);
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_CONTRAST, 0, 255, 1, 100);
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_SATURATION, 0, 255, 1, 128);
+	/* NTSC only */
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_HUE, -128, 127, 1, 0);
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
+	v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
+			V4L2_CID_CHROMA_AGC, 0, 1, 1, 1);
+	if (hdl->error) {
+		v4l2_ctrl_handler_free(hdl);
+		return hdl->error;
+	}
+	dev->v4l2_dev.ctrl_handler = hdl;
+	v4l2_ctrl_handler_setup(hdl);
+	return 0;
+}
+
+int tw68_video_init2(struct tw68_dev *dev, int video_nr)
+{
+	int ret;
+
+	set_tvnorm(dev, &tvnorms[0]);
+
+	dev->fmt      = format_by_fourcc(V4L2_PIX_FMT_BGR24);
+	dev->width    = 720;
+	dev->height   = 576;
+	dev->field    = V4L2_FIELD_INTERLACED;
+
+	INIT_LIST_HEAD(&dev->active);
+	dev->vidq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	dev->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	dev->vidq.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ | VB2_DMABUF;
+	dev->vidq.ops = &tw68_video_qops;
+	dev->vidq.mem_ops = &vb2_dma_sg_memops;
+	dev->vidq.drv_priv = dev;
+	dev->vidq.gfp_flags = __GFP_DMA32 | __GFP_KSWAPD_RECLAIM;
+	dev->vidq.buf_struct_size = sizeof(struct tw68_buf);
+	dev->vidq.lock = &dev->lock;
+	dev->vidq.min_buffers_needed = 2;
+	dev->vidq.dev = &dev->pci->dev;
+	ret = vb2_queue_init(&dev->vidq);
+	if (ret)
+		return ret;
+	dev->vdev = tw68_video_template;
+	dev->vdev.v4l2_dev = &dev->v4l2_dev;
+	dev->vdev.lock = &dev->lock;
+	dev->vdev.queue = &dev->vidq;
+	video_set_drvdata(&dev->vdev, dev);
+	return video_register_device(&dev->vdev, VFL_TYPE_VIDEO, video_nr);
+}
+
+/*
+ * tw68_irq_video_done
+ */
+void tw68_irq_video_done(struct tw68_dev *dev, unsigned long status)
+{
+	__u32 reg;
+
+	/* reset interrupts handled by this routine */
+	tw_writel(TW68_INTSTAT, status);
+	/*
+	 * Check most likely first
+	 *
+	 * DMAPI shows we have reached the end of the risc code
+	 * for the current buffer.
+	 */
+	if (status & TW68_DMAPI) {
+		struct tw68_buf *buf;
+
+		spin_lock(&dev->slock);
+		buf = list_entry(dev->active.next, struct tw68_buf, list);
+		list_del(&buf->list);
+		spin_unlock(&dev->slock);
+		buf->vb.vb2_buf.timestamp = ktime_get_ns();
+		buf->vb.field = dev->field;
+		buf->vb.sequence = dev->seqnr++;
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+		status &= ~(TW68_DMAPI);
+		if (0 == status)
+			return;
+	}
+	if (status & (TW68_VLOCK | TW68_HLOCK))
+		dev_dbg(&dev->pci->dev, "Lost sync\n");
+	if (status & TW68_PABORT)
+		dev_err(&dev->pci->dev, "PABORT interrupt\n");
+	if (status & TW68_DMAPERR)
+		dev_err(&dev->pci->dev, "DMAPERR interrupt\n");
+	/*
+	 * On TW6800, FDMIS is apparently generated if video input is switched
+	 * during operation.  Therefore, it is not enabled for that chip.
+	 */
+	if (status & TW68_FDMIS)
+		dev_dbg(&dev->pci->dev, "FDMIS interrupt\n");
+	if (status & TW68_FFOF) {
+		/* probably a logic error */
+		reg = tw_readl(TW68_DMAC) & TW68_FIFO_EN;
+		tw_clearl(TW68_DMAC, TW68_FIFO_EN);
+		dev_dbg(&dev->pci->dev, "FFOF interrupt\n");
+		tw_setl(TW68_DMAC, reg);
+	}
+	if (status & TW68_FFERR)
+		dev_dbg(&dev->pci->dev, "FFERR interrupt\n");
+}