[mirror_ubuntu-artful-kernel.git] / drivers / media / video / stk1160 / stk1160-v4l.c

/*
 * 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>
 *
 * 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.
 *
 */

#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/v4l2-chip-ident.h>
#include <media/videobuf2-vmalloc.h>

#include <media/saa7115.h>

#include "stk1160.h"
#include "stk1160-reg.h"

static unsigned int vidioc_debug;
module_param(vidioc_debug, int, 0644);
MODULE_PARM_DESC(vidioc_debug, "enable debug messages [vidioc]");

static bool keep_buffers;
module_param(keep_buffers, bool, 0644);
MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");

/* supported video standards */
static struct stk1160_fmt format[] = {
	{
		.name     = "16 bpp YUY2, 4:2:2, packed",
		.fourcc   = V4L2_PIX_FMT_UYVY,
		.depth    = 16,
	}
};

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);
	}

}

/*
 * 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_info("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)
{
	int i, rc;
	bool new_pkt_size;

	/* 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)
			return rc;
	}

	/* submit urbs and enables IRQ */
	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
		rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
		if (rc) {
			stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
			stk1160_uninit_isoc(dev);
			return rc;
		}
	}

	/* Start saa711x */
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);

	/* 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;
}

/* 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_info("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;

	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);

	stk1160_dbg("streaming stopped\n");

	mutex_unlock(&dev->v4l_lock);

	return 0;
}

static 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);

	strcpy(cap->driver, "stk1160");
	strcpy(cap->card, "stk1160");
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
	cap->device_caps =
		V4L2_CAP_VIDEO_CAPTURE |
		V4L2_CAP_STREAMING |
		V4L2_CAP_READWRITE;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
		struct v4l2_fmtdesc *f)
{
	if (f->index != 0)
		return -EINVAL;

	strlcpy(f->description, format[f->index].name, sizeof(f->description));
	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 vidioc_try_fmt_vid_cap(struct file *file, void *priv,
			struct v4l2_format *f)
{
	struct stk1160 *dev = video_drvdata(file);

	if (f->fmt.pix.pixelformat != format[0].fourcc) {
		stk1160_err("fourcc format 0x%08x invalid\n",
			f->fmt.pix.pixelformat);
		return -EINVAL;
	}

	/*
	 * User can't choose size at his own will,
	 * so we just return him the current size chosen
	 * at standard selection.
	 * TODO: Implement frame scaling?
	 */

	f->fmt.pix.width = dev->width;
	f->fmt.pix.height = dev->height;
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	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 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;
	int rc;

	if (vb2_is_busy(q))
		return -EBUSY;

	rc = vidioc_try_fmt_vid_cap(file, priv, f);
	if (rc < 0)
		return rc;

	/* We don't support any format changes */

	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 (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->norm = *norm;

	/* This is taken from saa7115 video decoder */
	if (dev->norm & V4L2_STD_525_60) {
		dev->width = 720;
		dev->height = 480;
	} else if (dev->norm & V4L2_STD_625_50) {
		dev->width = 720;
		dev->height = 576;
	} else {
		stk1160_err("invalid standard\n");
		return -EINVAL;
	}

	stk1160_set_std(dev);

	v4l2_device_call_all(&dev->v4l2_dev, 0, core, 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;

	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 (vb2_is_busy(&dev->vb_vidq))
		return -EBUSY;

	if (i > STK1160_MAX_INPUT)
		return -EINVAL;

	dev->ctl_input = i;

	stk1160_select_input(dev);

	return 0;
}

static int vidioc_g_chip_ident(struct file *file, void *priv,
	       struct v4l2_dbg_chip_ident *chip)
{
	switch (chip->match.type) {
	case V4L2_CHIP_MATCH_HOST:
		chip->ident = V4L2_IDENT_NONE;
		chip->revision = 0;
		return 0;
	default:
		return -EINVAL;
	}
}

#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;

	switch (reg->match.type) {
	case V4L2_CHIP_MATCH_AC97:
		/* TODO: Support me please :-( */
		return -EINVAL;
	case V4L2_CHIP_MATCH_I2C_DRIVER:
		v4l2_device_call_all(&dev->v4l2_dev, 0, core, g_register, reg);
		return 0;
	case V4L2_CHIP_MATCH_I2C_ADDR:
		/* TODO: is this correct? */
		v4l2_device_call_all(&dev->v4l2_dev, 0, core, g_register, reg);
		return 0;
	default:
		if (!v4l2_chip_match_host(&reg->match))
			return -EINVAL;
	}

	/* 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,
			     struct v4l2_dbg_register *reg)
{
	struct stk1160 *dev = video_drvdata(file);

	switch (reg->match.type) {
	case V4L2_CHIP_MATCH_AC97:
		return -EINVAL;
	case V4L2_CHIP_MATCH_I2C_DRIVER:
		v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_register, reg);
		return 0;
	case V4L2_CHIP_MATCH_I2C_ADDR:
		/* TODO: is this correct? */
		v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_register, reg);
		return 0;
	default:
		if (!v4l2_chip_match_host(&reg->match))
			return -EINVAL;
	}

	/* Match host */
	return stk1160_write_reg(dev, reg->reg, cpu_to_le16(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_log_status  = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
	.vidioc_g_chip_ident = vidioc_g_chip_ident,

#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, const struct v4l2_format *v4l_fmt,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], void *alloc_ctxs[])
{
	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);

	/* This means a packed colorformat */
	*nplanes = 1;

	sizes[0] = size;

	stk1160_info("%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 stk1160_buffer *buf =
		container_of(vb, 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_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_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 int stop_streaming(struct vb2_queue *vq)
{
	struct stk1160 *dev = vb2_get_drv_priv(vq);
	return stk1160_stop_streaming(dev);
}

static 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 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)
{
	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_STATE_ERROR);
		stk1160_info("buffer [%p/%d] aborted\n",
				buf, buf->vb.v4l2_buf.index);
	}
	/* It's important to clear current buffer */
	dev->isoc_ctl.buf = NULL;
	spin_unlock_irqrestore(&dev->buf_lock, flags);
}

int stk1160_vb2_setup(struct stk1160 *dev)
{
	int rc;
	struct vb2_queue *q;

	q = &dev->vb_vidq;
	memset(q, 0, sizeof(dev->vb_vidq));
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
	q->drv_priv = dev;
	q->buf_struct_size = sizeof(struct stk1160_buffer);
	q->ops = &stk1160_video_qops;
	q->mem_ops = &vb2_vmalloc_memops;

	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.debug = vidioc_debug;
	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;
	dev->vdev.queue->lock = &dev->vb_queue_lock;

	/* This will be used to set video_device parent */
	dev->vdev.v4l2_dev = &dev->v4l2_dev;
	set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);

	/* 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, core, s_std,
			dev->norm);

	video_set_drvdata(&dev->vdev, dev);
	rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -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;
}
Commit	Line	Data
9cb2173e EG	1	/*
	2	* STK1160 driver
	3	*
	4	* Copyright (C) 2012 Ezequiel Garcia
	5	* <elezegarcia--a.t--gmail.com>
	6	*
	7	* Based on Easycap driver by R.M. Thomas
	8	* Copyright (C) 2010 R.M. Thomas
	9	* <rmthomas--a.t--sciolus.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/usb.h>
	25	#include <linux/mm.h>
	26	#include <linux/slab.h>
	27
	28	#include <linux/videodev2.h>
	29	#include <media/v4l2-device.h>
	30	#include <media/v4l2-common.h>
	31	#include <media/v4l2-ioctl.h>
	32	#include <media/v4l2-fh.h>
	33	#include <media/v4l2-event.h>
	34	#include <media/v4l2-chip-ident.h>
	35	#include <media/videobuf2-vmalloc.h>
	36
	37	#include <media/saa7115.h>
	38
	39	#include "stk1160.h"
	40	#include "stk1160-reg.h"
	41
	42	static unsigned int vidioc_debug;
	43	module_param(vidioc_debug, int, 0644);
	44	MODULE_PARM_DESC(vidioc_debug, "enable debug messages [vidioc]");
	45
	46	static bool keep_buffers;
	47	module_param(keep_buffers, bool, 0644);
	48	MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
	49
	50	/* supported video standards */
	51	static struct stk1160_fmt format[] = {
	52	{
	53	.name = "16 bpp YUY2, 4:2:2, packed",
	54	.fourcc = V4L2_PIX_FMT_UYVY,
	55	.depth = 16,
	56	}
	57	};
	58
	59	static void stk1160_set_std(struct stk1160 *dev)
	60	{
	61	int i;
	62
	63	static struct regval std525[] = {
	64
65	/* 720x480 */
66
67	/* Frame start */
68	{STK116_CFSPO_STX_L, 0x0000},
69	{STK116_CFSPO_STX_H, 0x0000},
70	{STK116_CFSPO_STY_L, 0x0003},
71	{STK116_CFSPO_STY_H, 0x0000},
72
73	/* Frame end */
74	{STK116_CFEPO_ENX_L, 0x05a0},
75	{STK116_CFEPO_ENX_H, 0x0005},
76	{STK116_CFEPO_ENY_L, 0x00f3},
77	{STK116_CFEPO_ENY_H, 0x0000},
78
79	{0xffff, 0xffff}
80	};
81
82	static struct regval std625[] = {
83
84	/* 720x576 */
85
86	/* TODO: Each line of frame has some junk at the end */
87	/* Frame start */
88	{STK116_CFSPO, 0x0000},
89	{STK116_CFSPO+1, 0x0000},
90	{STK116_CFSPO+2, 0x0001},
91	{STK116_CFSPO+3, 0x0000},
92
93	/* Frame end */
94	{STK116_CFEPO, 0x05a0},
95	{STK116_CFEPO+1, 0x0005},
96	{STK116_CFEPO+2, 0x0121},
97	{STK116_CFEPO+3, 0x0001},
98
99	{0xffff, 0xffff}
100	};
101
102	if (dev->norm & V4L2_STD_525_60) {
103	stk1160_dbg("registers to NTSC like standard\n");
104	for (i = 0; std525[i].reg != 0xffff; i++)
105	stk1160_write_reg(dev, std525[i].reg, std525[i].val);
106	} else {
107	stk1160_dbg("registers to PAL like standard\n");
108	for (i = 0; std625[i].reg != 0xffff; i++)
109	stk1160_write_reg(dev, std625[i].reg, std625[i].val);
110	}
111
112	}
113
114	/*
115	* Set a new alternate setting.
116	* Returns true is dev->max_pkt_size has changed, false otherwise.
117	*/
118	static bool stk1160_set_alternate(struct stk1160 *dev)
119	{
120	int i, prev_alt = dev->alt;
121	unsigned int min_pkt_size;
122	bool new_pkt_size;
123
124	/*
125	* If we don't set right alternate,
126	* then we will get a green screen with junk.
127	*/
128	min_pkt_size = STK1160_MIN_PKT_SIZE;
129
130	for (i = 0; i < dev->num_alt; i++) {
131	/* stop when the selected alt setting offers enough bandwidth */
132	if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
133	dev->alt = i;
134	break;
135	/*
136	* otherwise make sure that we end up with the maximum bandwidth
137	* because the min_pkt_size equation might be wrong...
138	*/
139	} else if (dev->alt_max_pkt_size[i] >
140	dev->alt_max_pkt_size[dev->alt])
141	dev->alt = i;
142	}
143
144	stk1160_info("setting alternate %d\n", dev->alt);
145
146	if (dev->alt != prev_alt) {
147	stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
148	min_pkt_size, dev->alt);
149	stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
150	dev->alt, dev->alt_max_pkt_size[dev->alt]);
151	usb_set_interface(dev->udev, 0, dev->alt);
152	}
153
154	new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
155	dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
156
157	return new_pkt_size;
158	}
159
160	static int stk1160_start_streaming(struct stk1160 *dev)
161	{
162	int i, rc;
163	bool new_pkt_size;
164
165	/* Check device presence */
166	if (!dev->udev)
167	return -ENODEV;
168
169	if (mutex_lock_interruptible(&dev->v4l_lock))
170	return -ERESTARTSYS;
171	/*
172	* For some reason it is mandatory to set alternate first
173	* and only then initialize isoc urbs.
174	* Someone please explain me why ;)
175	*/
176	new_pkt_size = stk1160_set_alternate(dev);
177
178	/*
179	* We (re)allocate isoc urbs if:
180	* there is no allocated isoc urbs, OR
181	* a new dev->max_pkt_size is detected
182	*/
183	if (!dev->isoc_ctl.num_bufs \|\| new_pkt_size) {
184	rc = stk1160_alloc_isoc(dev);
185	if (rc < 0)
186	return rc;
187	}
188
189	/* submit urbs and enables IRQ */
190	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
191	rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
192	if (rc) {
193	stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
194	stk1160_uninit_isoc(dev);
195	return rc;
196	}
197	}
198
199	/* Start saa711x */
200	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
201
202	/* Start stk1160 */
203	stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
204	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
205
206	stk1160_dbg("streaming started\n");
207
208	mutex_unlock(&dev->v4l_lock);
209
210	return 0;
211	}
212
213	/* Must be called with v4l_lock hold */
214	static void stk1160_stop_hw(struct stk1160 *dev)
215	{
216	/* If the device is not physically present, there is nothing to do */
217	if (!dev->udev)
218	return;
219
220	/* set alternate 0 */
221	dev->alt = 0;
222	stk1160_info("setting alternate %d\n", dev->alt);
223	usb_set_interface(dev->udev, 0, 0);
224
225	/* Stop stk1160 */
226	stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
227	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
228
229	/* Stop saa711x */
230	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
231	}
232
233	static int stk1160_stop_streaming(struct stk1160 *dev)
234	{
235	if (mutex_lock_interruptible(&dev->v4l_lock))
236	return -ERESTARTSYS;
237
238	stk1160_cancel_isoc(dev);
239
240	/*
241	* It is possible to keep buffers around using a module parameter.
242	* This is intended to avoid memory fragmentation.
243	*/
244	if (!keep_buffers)
245	stk1160_free_isoc(dev);
246
247	stk1160_stop_hw(dev);
248
249	stk1160_clear_queue(dev);
250
251	stk1160_dbg("streaming stopped\n");
252
253	mutex_unlock(&dev->v4l_lock);
254
255	return 0;
256	}
257
258	static struct v4l2_file_operations stk1160_fops = {
259	.owner = THIS_MODULE,
260	.open = v4l2_fh_open,
261	.release = vb2_fop_release,
262	.read = vb2_fop_read,
263	.poll = vb2_fop_poll,
264	.mmap = vb2_fop_mmap,
265	.unlocked_ioctl = video_ioctl2,
266	};
267
268	/*
269	* vidioc ioctls
270	*/
271	static int vidioc_querycap(struct file *file,
272	void priv, struct v4l2_capability cap)
273	{
274	struct stk1160 *dev = video_drvdata(file);
275
276	strcpy(cap->driver, "stk1160");
277	strcpy(cap->card, "stk1160");
278	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
279	cap->device_caps =
280	V4L2_CAP_VIDEO_CAPTURE \|
281	V4L2_CAP_STREAMING \|
282	V4L2_CAP_READWRITE;
283	cap->capabilities = cap->device_caps \| V4L2_CAP_DEVICE_CAPS;
284	return 0;
285	}
286
287	static int vidioc_enum_fmt_vid_cap(struct file file, void priv,
288	struct v4l2_fmtdesc *f)
289	{
290	if (f->index != 0)
291	return -EINVAL;
292
293	strlcpy(f->description, format[f->index].name, sizeof(f->description));
294	f->pixelformat = format[f->index].fourcc;
295	return 0;
296	}
297
298	static int vidioc_g_fmt_vid_cap(struct file file, void priv,
299	struct v4l2_format *f)
300	{
301	struct stk1160 *dev = video_drvdata(file);
302
303	f->fmt.pix.width = dev->width;
304	f->fmt.pix.height = dev->height;
305	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
306	f->fmt.pix.pixelformat = dev->fmt->fourcc;
307	f->fmt.pix.bytesperline = dev->width * 2;
308	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
309	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
310
311	return 0;
312	}
313
314	static int vidioc_try_fmt_vid_cap(struct file file, void priv,
315	struct v4l2_format *f)
316	{
317	struct stk1160 *dev = video_drvdata(file);
318
319	if (f->fmt.pix.pixelformat != format[0].fourcc) {
320	stk1160_err("fourcc format 0x%08x invalid\n",
321	f->fmt.pix.pixelformat);
322	return -EINVAL;
323	}
324
325	/*
326	* User can't choose size at his own will,
327	* so we just return him the current size chosen
328	* at standard selection.
329	* TODO: Implement frame scaling?
330	*/
331
332	f->fmt.pix.width = dev->width;
333	f->fmt.pix.height = dev->height;
334	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
335	f->fmt.pix.bytesperline = dev->width * 2;
336	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
337	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
338
339	return 0;
340	}
341
342	static int vidioc_s_fmt_vid_cap(struct file file, void priv,
343	struct v4l2_format *f)
344	{
345	struct stk1160 *dev = video_drvdata(file);
346	struct vb2_queue *q = &dev->vb_vidq;
347	int rc;
348
349	if (vb2_is_busy(q))
350	return -EBUSY;
351
352	rc = vidioc_try_fmt_vid_cap(file, priv, f);
353	if (rc < 0)
354	return rc;
355
356	/* We don't support any format changes */
357
358	return 0;
359	}
360
361	static int vidioc_querystd(struct file file, void priv, v4l2_std_id *norm)
362	{
363	struct stk1160 *dev = video_drvdata(file);
364	v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
365	return 0;
366	}
367
368	static int vidioc_g_std(struct file file, void priv, v4l2_std_id *norm)
369	{
370	struct stk1160 *dev = video_drvdata(file);
371
372	*norm = dev->norm;
373	return 0;
374	}
375
376	static int vidioc_s_std(struct file file, void priv, v4l2_std_id *norm)
377	{
378	struct stk1160 *dev = video_drvdata(file);
379	struct vb2_queue *q = &dev->vb_vidq;
380
381	if (vb2_is_busy(q))
382	return -EBUSY;
383
384	/* Check device presence */
385	if (!dev->udev)
386	return -ENODEV;
387
388	/* We need to set this now, before we call stk1160_set_std */
389	dev->norm = *norm;
390
391	/* This is taken from saa7115 video decoder */
392	if (dev->norm & V4L2_STD_525_60) {
393	dev->width = 720;
394	dev->height = 480;
395	} else if (dev->norm & V4L2_STD_625_50) {
396	dev->width = 720;
397	dev->height = 576;
398	} else {
399	stk1160_err("invalid standard\n");
400	return -EINVAL;
401	}
402
403	stk1160_set_std(dev);
404
405	v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std,
406	dev->norm);
407
408	return 0;
409	}
410
411
412	static int vidioc_enum_input(struct file file, void priv,
413	struct v4l2_input *i)
414	{
415	struct stk1160 *dev = video_drvdata(file);
416
417	if (i->index > STK1160_MAX_INPUT)
418	return -EINVAL;
419
420	sprintf(i->name, "Composite%d", i->index);
421	i->type = V4L2_INPUT_TYPE_CAMERA;
422	i->std = dev->vdev.tvnorms;
423	return 0;
424	}
425
426	static int vidioc_g_input(struct file file, void priv, unsigned int *i)
427	{
428	struct stk1160 *dev = video_drvdata(file);
429	*i = dev->ctl_input;
430	return 0;
431	}
432
433	static int vidioc_s_input(struct file file, void priv, unsigned int i)
434	{
435	struct stk1160 *dev = video_drvdata(file);
436
437	if (vb2_is_busy(&dev->vb_vidq))
438	return -EBUSY;
439
440	if (i > STK1160_MAX_INPUT)
441	return -EINVAL;
442
443	dev->ctl_input = i;
444
445	stk1160_select_input(dev);
446
447	return 0;
448	}
449
450	static int vidioc_g_chip_ident(struct file file, void priv,
451	struct v4l2_dbg_chip_ident *chip)
452	{
453	switch (chip->match.type) {
454	case V4L2_CHIP_MATCH_HOST:
455	chip->ident = V4L2_IDENT_NONE;
456	chip->revision = 0;
457	return 0;
458	default:
459	return -EINVAL;
460	}
461	}
462
463	#ifdef CONFIG_VIDEO_ADV_DEBUG
464	static int vidioc_g_register(struct file file, void priv,
465	struct v4l2_dbg_register *reg)
466	{
467	struct stk1160 *dev = video_drvdata(file);
468	int rc;
469	u8 val;
470
471	switch (reg->match.type) {
472	case V4L2_CHIP_MATCH_AC97:
473	/* TODO: Support me please :-( */
474	return -EINVAL;
475	case V4L2_CHIP_MATCH_I2C_DRIVER:
476	v4l2_device_call_all(&dev->v4l2_dev, 0, core, g_register, reg);
477	return 0;
478	case V4L2_CHIP_MATCH_I2C_ADDR:
479	/* TODO: is this correct? */
480	v4l2_device_call_all(&dev->v4l2_dev, 0, core, g_register, reg);
481	return 0;
482	default:
483	if (!v4l2_chip_match_host(&reg->match))
484	return -EINVAL;
485	}
486
487	/* Match host */
488	rc = stk1160_read_reg(dev, reg->reg, &val);
489	reg->val = val;
490	reg->size = 1;
491
492	return rc;
493	}
494
495	static int vidioc_s_register(struct file file, void priv,
496	struct v4l2_dbg_register *reg)
497	{
498	struct stk1160 *dev = video_drvdata(file);
499
500	switch (reg->match.type) {
501	case V4L2_CHIP_MATCH_AC97:
502	return -EINVAL;
503	case V4L2_CHIP_MATCH_I2C_DRIVER:
504	v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_register, reg);
505	return 0;
506	case V4L2_CHIP_MATCH_I2C_ADDR:
507	/* TODO: is this correct? */
508	v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_register, reg);
509	return 0;
510	default:
511	if (!v4l2_chip_match_host(&reg->match))
512	return -EINVAL;
513	}
514
515	/* Match host */
516	return stk1160_write_reg(dev, reg->reg, cpu_to_le16(reg->val));
517	}
518	#endif
519
520	static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
521	.vidioc_querycap = vidioc_querycap,
522	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
523	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
524	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
525	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
526	.vidioc_querystd = vidioc_querystd,
527	.vidioc_g_std = vidioc_g_std,
528	.vidioc_s_std = vidioc_s_std,
529	.vidioc_enum_input = vidioc_enum_input,
530	.vidioc_g_input = vidioc_g_input,
531	.vidioc_s_input = vidioc_s_input,
532
533	/* vb2 takes care of these */
534	.vidioc_reqbufs = vb2_ioctl_reqbufs,
535	.vidioc_querybuf = vb2_ioctl_querybuf,
536	.vidioc_qbuf = vb2_ioctl_qbuf,
537	.vidioc_dqbuf = vb2_ioctl_dqbuf,
538	.vidioc_streamon = vb2_ioctl_streamon,
539	.vidioc_streamoff = vb2_ioctl_streamoff,
540
541	.vidioc_log_status = v4l2_ctrl_log_status,
542	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
543	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
544	.vidioc_g_chip_ident = vidioc_g_chip_ident,
545
546	#ifdef CONFIG_VIDEO_ADV_DEBUG
547	.vidioc_g_register = vidioc_g_register,
548	.vidioc_s_register = vidioc_s_register,
549	#endif
550	};
551
552	/********************************************************************/
553
554	/*
555	* Videobuf2 operations
556	*/
557	static int queue_setup(struct vb2_queue vq, const struct v4l2_format v4l_fmt,
558	unsigned int nbuffers, unsigned int nplanes,
559	unsigned int sizes[], void *alloc_ctxs[])
560	{
561	struct stk1160 *dev = vb2_get_drv_priv(vq);
562	unsigned long size;
563
564	size = dev->width * dev->height * 2;
565
566	/*
567	* Here we can change the number of buffers being requested.
568	* So, we set a minimum and a maximum like this:
569	*/
570	nbuffers = clamp_t(unsigned int, nbuffers,
571	STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
572
573	/* This means a packed colorformat */
574	*nplanes = 1;
575
576	sizes[0] = size;
577
578	stk1160_info("%s: buffer count %d, each %ld bytes\n",
579	__func__, *nbuffers, size);
580
581	return 0;
582	}
583
584	static void buffer_queue(struct vb2_buffer *vb)
585	{
586	unsigned long flags;
587	struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
588	struct stk1160_buffer *buf =
589	container_of(vb, struct stk1160_buffer, vb);
590
591	spin_lock_irqsave(&dev->buf_lock, flags);
592	if (!dev->udev) {
593	/*
594	* If the device is disconnected return the buffer to userspace
595	* directly. The next QBUF call will fail with -ENODEV.
596	*/
597	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
598	} else {
599
600	buf->mem = vb2_plane_vaddr(vb, 0);
601	buf->length = vb2_plane_size(vb, 0);
602	buf->bytesused = 0;
603	buf->pos = 0;
604
605	/*
606	* If buffer length is less from expected then we return
607	* the buffer to userspace directly.
608	*/
609	if (buf->length < dev->width * dev->height * 2)
610	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
611	else
612	list_add_tail(&buf->list, &dev->avail_bufs);
613
614	}
615	spin_unlock_irqrestore(&dev->buf_lock, flags);
616	}
617
618	static int start_streaming(struct vb2_queue *vq, unsigned int count)
619	{
620	struct stk1160 *dev = vb2_get_drv_priv(vq);
621	return stk1160_start_streaming(dev);
622	}
623
624	/* abort streaming and wait for last buffer */
625	static int stop_streaming(struct vb2_queue *vq)
626	{
627	struct stk1160 *dev = vb2_get_drv_priv(vq);
628	return stk1160_stop_streaming(dev);
629	}
630
631	static struct vb2_ops stk1160_video_qops = {
632	.queue_setup = queue_setup,
633	.buf_queue = buffer_queue,
634	.start_streaming = start_streaming,
635	.stop_streaming = stop_streaming,
636	.wait_prepare = vb2_ops_wait_prepare,
637	.wait_finish = vb2_ops_wait_finish,
638	};
639
640	static struct video_device v4l_template = {
641	.name = "stk1160",
642	.tvnorms = V4L2_STD_525_60 \| V4L2_STD_625_50,
643	.fops = &stk1160_fops,
644	.ioctl_ops = &stk1160_ioctl_ops,
645	.release = video_device_release_empty,
646	};
647
648	/********************************************************************/
649
650	/* Must be called with both v4l_lock and vb_queue_lock hold */
651	void stk1160_clear_queue(struct stk1160 *dev)
652	{
653	struct stk1160_buffer *buf;
654	unsigned long flags;
655
656	/* Release all active buffers */
657	spin_lock_irqsave(&dev->buf_lock, flags);
658	while (!list_empty(&dev->avail_bufs)) {
659	buf = list_first_entry(&dev->avail_bufs,
660	struct stk1160_buffer, list);
661	list_del(&buf->list);
662	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
663	stk1160_info("buffer [%p/%d] aborted\n",
664	buf, buf->vb.v4l2_buf.index);
665	}
666	/* It's important to clear current buffer */
667	dev->isoc_ctl.buf = NULL;
668	spin_unlock_irqrestore(&dev->buf_lock, flags);
669	}
670
671	int stk1160_vb2_setup(struct stk1160 *dev)
672	{
673	int rc;
674	struct vb2_queue *q;
675
676	q = &dev->vb_vidq;
677	memset(q, 0, sizeof(dev->vb_vidq));
678	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
679	q->io_modes = VB2_READ \| VB2_MMAP \| VB2_USERPTR;
680	q->drv_priv = dev;
681	q->buf_struct_size = sizeof(struct stk1160_buffer);
682	q->ops = &stk1160_video_qops;
683	q->mem_ops = &vb2_vmalloc_memops;
684
685	rc = vb2_queue_init(q);
686	if (rc < 0)
687	return rc;
688
689	/* initialize video dma queue */
690	INIT_LIST_HEAD(&dev->avail_bufs);
691
692	return 0;
693	}
694
695	int stk1160_video_register(struct stk1160 *dev)
696	{
697	int rc;
698
699	/* Initialize video_device with a template structure */
700	dev->vdev = v4l_template;
701	dev->vdev.debug = vidioc_debug;
702	dev->vdev.queue = &dev->vb_vidq;
703
704	/*
705	* Provide mutexes for v4l2 core and for videobuf2 queue.
706	* It will be used to protect only v4l2 ioctls.
707	*/
708	dev->vdev.lock = &dev->v4l_lock;
709	dev->vdev.queue->lock = &dev->vb_queue_lock;
710
711	/* This will be used to set video_device parent */
712	dev->vdev.v4l2_dev = &dev->v4l2_dev;
713	set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags);
714
715	/* NTSC is default */
716	dev->norm = V4L2_STD_NTSC_M;
717	dev->width = 720;
718	dev->height = 480;
719
720	/* set default format */
721	dev->fmt = &format[0];
722	stk1160_set_std(dev);
723
724	v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_std,
725	dev->norm);
726
727	video_set_drvdata(&dev->vdev, dev);
728	rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
729	if (rc < 0) {
730	stk1160_err("video_register_device failed (%d)\n", rc);
731	return rc;
732	}
733
734	v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
735	video_device_node_name(&dev->vdev));
736
737	return 0;
738	}