path: root/drivers/media/pci/cx18/cx18-streams.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  cx18 init/start/stop/exit stream functions
 *
 *  Derived from ivtv-streams.c
 *
 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
 *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
 */

#include "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-fileops.h"
#include "cx18-mailbox.h"
#include "cx18-i2c.h"
#include "cx18-queue.h"
#include "cx18-ioctl.h"
#include "cx18-streams.h"
#include "cx18-cards.h"
#include "cx18-scb.h"
#include "cx18-dvb.h"

#define CX18_DSP0_INTERRUPT_MASK	0xd0004C

static const struct v4l2_file_operations cx18_v4l2_enc_fops = {
	.owner = THIS_MODULE,
	.read = cx18_v4l2_read,
	.open = cx18_v4l2_open,
	.unlocked_ioctl = video_ioctl2,
	.release = cx18_v4l2_close,
	.poll = cx18_v4l2_enc_poll,
};

static const struct v4l2_file_operations cx18_v4l2_enc_yuv_fops = {
	.owner = THIS_MODULE,
	.open = cx18_v4l2_open,
	.unlocked_ioctl = video_ioctl2,
	.release = cx18_v4l2_close,
	.poll = vb2_fop_poll,
	.read = vb2_fop_read,
	.mmap = vb2_fop_mmap,
};

/* offset from 0 to register ts v4l2 minors on */
#define CX18_V4L2_ENC_TS_OFFSET   16
/* offset from 0 to register pcm v4l2 minors on */
#define CX18_V4L2_ENC_PCM_OFFSET  24
/* offset from 0 to register yuv v4l2 minors on */
#define CX18_V4L2_ENC_YUV_OFFSET  32

static struct {
	const char *name;
	int vfl_type;
	int num_offset;
	int dma;
	u32 caps;
} cx18_stream_info[] = {
	{	/* CX18_ENC_STREAM_TYPE_MPG */
		"encoder MPEG",
		VFL_TYPE_VIDEO, 0,
		DMA_FROM_DEVICE,
		V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
		V4L2_CAP_AUDIO | V4L2_CAP_TUNER
	},
	{	/* CX18_ENC_STREAM_TYPE_TS */
		"TS",
		VFL_TYPE_VIDEO, -1,
		DMA_FROM_DEVICE,
	},
	{	/* CX18_ENC_STREAM_TYPE_YUV */
		"encoder YUV",
		VFL_TYPE_VIDEO, CX18_V4L2_ENC_YUV_OFFSET,
		DMA_FROM_DEVICE,
		V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
		V4L2_CAP_STREAMING | V4L2_CAP_AUDIO | V4L2_CAP_TUNER
	},
	{	/* CX18_ENC_STREAM_TYPE_VBI */
		"encoder VBI",
		VFL_TYPE_VBI, 0,
		DMA_FROM_DEVICE,
		V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE |
		V4L2_CAP_READWRITE | V4L2_CAP_AUDIO | V4L2_CAP_TUNER
	},
	{	/* CX18_ENC_STREAM_TYPE_PCM */
		"encoder PCM audio",
		VFL_TYPE_VIDEO, CX18_V4L2_ENC_PCM_OFFSET,
		DMA_FROM_DEVICE,
		V4L2_CAP_TUNER | V4L2_CAP_AUDIO | V4L2_CAP_READWRITE,
	},
	{	/* CX18_ENC_STREAM_TYPE_IDX */
		"encoder IDX",
		VFL_TYPE_VIDEO, -1,
		DMA_FROM_DEVICE,
	},
	{	/* CX18_ENC_STREAM_TYPE_RAD */
		"encoder radio",
		VFL_TYPE_RADIO, 0,
		DMA_NONE,
		V4L2_CAP_RADIO | V4L2_CAP_TUNER
	},
};

static int cx18_queue_setup(struct vb2_queue *vq,
			    unsigned int *nbuffers, unsigned int *nplanes,
			    unsigned int sizes[], struct device *alloc_devs[])
{
	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
	struct cx18_stream *s = vb2_get_drv_priv(vq);
	struct cx18 *cx = s->cx;
	unsigned int szimage;

	/*
	 * HM12 YUV size is (Y=(h*720) + UV=(h*(720/2)))
	 * UYUV YUV size is (Y=(h*720) + UV=(h*(720)))
	 */
	if (s->pixelformat == V4L2_PIX_FMT_NV12_16L16)
		szimage = cx->cxhdl.height * 720 * 3 / 2;
	else
		szimage = cx->cxhdl.height * 720 * 2;

	/*
	 * Let's request at least three buffers: two for the
	 * DMA engine and one for userspace.
	 */
	if (q_num_bufs + *nbuffers < 3)
		*nbuffers = 3 - q_num_bufs;

	if (*nplanes) {
		if (*nplanes != 1 || sizes[0] < szimage)
			return -EINVAL;
		return 0;
	}

	sizes[0] = szimage;
	*nplanes = 1;
	return 0;
}

static void cx18_buf_queue(struct vb2_buffer *vb)
{
	struct cx18_stream *s = vb2_get_drv_priv(vb->vb2_queue);
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct cx18_vb2_buffer *buf =
		container_of(vbuf, struct cx18_vb2_buffer, vb);
	unsigned long flags;

	spin_lock_irqsave(&s->vb_lock, flags);
	list_add_tail(&buf->list, &s->vb_capture);
	spin_unlock_irqrestore(&s->vb_lock, flags);
}

static int cx18_buf_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct cx18_stream *s = vb2_get_drv_priv(vb->vb2_queue);
	struct cx18 *cx = s->cx;
	unsigned int size;

	/*
	 * HM12 YUV size is (Y=(h*720) + UV=(h*(720/2)))
	 * UYUV YUV size is (Y=(h*720) + UV=(h*(720)))
	 */
	if (s->pixelformat == V4L2_PIX_FMT_NV12_16L16)
		size = cx->cxhdl.height * 720 * 3 / 2;
	else
		size = cx->cxhdl.height * 720 * 2;

	if (vb2_plane_size(vb, 0) < size)
		return -EINVAL;
	vb2_set_plane_payload(vb, 0, size);
	vbuf->field = V4L2_FIELD_INTERLACED;
	return 0;
}

void cx18_clear_queue(struct cx18_stream *s, enum vb2_buffer_state state)
{
	while (!list_empty(&s->vb_capture)) {
		struct cx18_vb2_buffer *buf;

		buf = list_first_entry(&s->vb_capture,
				       struct cx18_vb2_buffer, list);
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, state);
	}
}

static