em28xx-video.c

trident tm5600的linux驱动

	dev->stream_on = 1;
	fh->stream_on  = 1;
	mutex_unlock(&dev->lock);
	return rc;
}

static int res_check(struct em28xx_fh *fh)
{
	return (fh->stream_on);
}

static void res_free(struct em28xx_fh *fh)
{
	struct em28xx    *dev = fh->dev;

	mutex_lock(&dev->lock);
	fh->stream_on = 0;
	dev->stream_on = 0;
	mutex_unlock(&dev->lock);
}

/*
 * em28xx_get_ctrl()
 * return the current saturation, brightness or contrast, mute state
 */
static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = dev->mute;
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		ctrl->value = dev->volume;
		return 0;
	default:
		return -EINVAL;
	}
}

/*
 * em28xx_set_ctrl()
 * mute or set new saturation, brightness or contrast
 */
static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value != dev->mute) {
			dev->mute = ctrl->value;
			return em28xx_audio_analog_set(dev);
		}
		return 0;
	case V4L2_CID_AUDIO_VOLUME:
		dev->volume = ctrl->value;
		return em28xx_audio_analog_set(dev);
	default:
		return -EINVAL;
	}
}

static int check_dev(struct em28xx *dev)
{
	if (dev->state & DEV_DISCONNECTED) {
		em28xx_errdev("v4l2 ioctl: device not present\n");
		return -ENODEV;
	}

	if (dev->state & DEV_MISCONFIGURED) {
		em28xx_errdev("v4l2 ioctl: device is misconfigured; "
			      "close and open it again\n");
		return -EIO;
	}
	return 0;
}

static void get_scale(struct em28xx *dev,
			unsigned int width, unsigned int height,
			unsigned int *hscale, unsigned int *vscale)
{
	unsigned int          maxw   = norm_maxw(dev);
	unsigned int          maxh   = norm_maxh(dev);

	*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
	if (*hscale >= 0x4000)
		*hscale = 0x3fff;

	*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
	if (*vscale >= 0x4000)
		*vscale = 0x3fff;
}

/* ------------------------------------------------------------------
	IOCTL vidioc handling
   ------------------------------------------------------------------*/

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
					struct v4l2_format *f)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;

	mutex_lock(&dev->lock);

	f->fmt.pix.width = dev->width;
	f->fmt.pix.height = dev->height;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
	f->fmt.pix.bytesperline = dev->width * 2;
	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

	/* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
	f->fmt.pix.field = dev->interlaced ?
			   V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;

	mutex_unlock(&dev->lock);
	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
			struct v4l2_format *f)
{
	struct em28xx_fh      *fh    = priv;
	struct em28xx         *dev   = fh->dev;
	int                   width  = f->fmt.pix.width;
	int                   height = f->fmt.pix.height;
	unsigned int          maxw   = norm_maxw(dev);
	unsigned int          maxh   = norm_maxh(dev);
	unsigned int          hscale, vscale;

	/* width must even because of the YUYV format
	   height must be even because of interlacing */
	height &= 0xfffe;
	width &= 0xfffe;

	if (height < 32)
		height = 32;
	if (height > maxh)
		height = maxh;
	if (width < 48)
		width = 48;
	if (width > maxw)
		width = maxw;

	mutex_lock(&dev->lock);

	if (dev->is_em2800) {
		/* the em2800 can only scale down to 50% */
		if (height % (maxh / 2))
			height = maxh;
		if (width % (maxw / 2))
			width = maxw;
		/* according to empiatech support */
		/* the MaxPacketSize is to small to support */
		/* framesizes larger than 640x480 @ 30 fps */
		/* or 640x576 @ 25 fps. As this would cut */
		/* of a part of the image we prefer */
		/* 360x576 or 360x480 for now */
		if (width == maxw && height == maxh)
			width /= 2;
	}

	get_scale(dev, width, height, &hscale, &vscale);

	width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
	height = (((unsigned long)maxh) << 12) / (vscale + 4096L);

	f->fmt.pix.width = width;
	f->fmt.pix.height = height;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
	f->fmt.pix.bytesperline = width * 2;
	f->fmt.pix.sizeimage = width * 2 * height;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;

	mutex_unlock(&dev->lock);
	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
			struct v4l2_format *f)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	vidioc_try_fmt_vid_cap(file, priv, f);

	mutex_lock(&dev->lock);

	if (videobuf_queue_is_busy(&fh->vb_vidq)) {
		em28xx_errdev("%s queue busy\n", __func__);
		rc = -EBUSY;
		goto out;
	}

	if (dev->stream_on && !fh->stream_on) {
		em28xx_errdev("%s device in use by another fh\n", __func__);
		rc = -EBUSY;
		goto out;
	}

	/* set new image size */
	dev->width = f->fmt.pix.width;
	dev->height = f->fmt.pix.height;
	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);

	em28xx_set_alternate(dev);
	em28xx_resolution_set(dev);

	rc = 0;

out:
	mutex_unlock(&dev->lock);
	return rc;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id * norm)
{
	struct em28xx_fh   *fh  = priv;
	struct em28xx      *dev = fh->dev;
	struct v4l2_format f;
	int                rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	mutex_lock(&dev->lock);
	dev->norm = *norm;
	mutex_unlock(&dev->lock);

	/* Adjusts width/height, if needed */
	f.fmt.pix.width = dev->width;
	f.fmt.pix.height = dev->height;
	vidioc_try_fmt_vid_cap(file, priv, &f);

	mutex_lock(&dev->lock);

	/* set new image size */
	dev->width = f.fmt.pix.width;
	dev->height = f.fmt.pix.height;
	get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);

	em28xx_resolution_set(dev);
	em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);

	mutex_unlock(&dev->lock);
	return 0;
}

static const char *iname[] = {
	[EM28XX_VMUX_COMPOSITE1] = "Composite1",
	[EM28XX_VMUX_COMPOSITE2] = "Composite2",
	[EM28XX_VMUX_COMPOSITE3] = "Composite3",
	[EM28XX_VMUX_COMPOSITE4] = "Composite4",
	[EM28XX_VMUX_SVIDEO]     = "S-Video",
	[EM28XX_VMUX_TELEVISION] = "Television",
	[EM28XX_VMUX_CABLE]      = "Cable TV",
	[EM28XX_VMUX_DVB]        = "DVB",
	[EM28XX_VMUX_DEBUG]      = "for debug only",
};

static int vidioc_enum_input(struct file *file, void *priv,
				struct v4l2_input *i)
{
	struct em28xx_fh   *fh  = priv;
	struct em28xx      *dev = fh->dev;
	unsigned int       n;

	n = i->index;
	if (n >= MAX_EM28XX_INPUT)
		return -EINVAL;
	if (0 == INPUT(n)->type)
		return -EINVAL;

	i->index = n;
	i->type = V4L2_INPUT_TYPE_CAMERA;

	strcpy(i->name, iname[INPUT(n)->type]);

	if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
		(EM28XX_VMUX_CABLE == INPUT(n)->type))
		i->type = V4L2_INPUT_TYPE_TUNER;

	i->std = dev->vdev->tvnorms;

	return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct em28xx_fh   *fh  = priv;
	struct em28xx      *dev = fh->dev;

	*i = dev->ctl_input;

	return 0;
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	struct em28xx_fh   *fh  = priv;
	struct em28xx      *dev = fh->dev;
	int                rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	if (i >= MAX_EM28XX_INPUT)
		return -EINVAL;
	if (0 == INPUT(i)->type)
		return -EINVAL;

	mutex_lock(&dev->lock);

	video_mux(dev, i);

	mutex_unlock(&dev->lock);
	return 0;
}

static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
	struct em28xx_fh   *fh    = priv;
	struct em28xx      *dev   = fh->dev;
	unsigned int        index = a->index;

	if (a->index > 1)
		return -EINVAL;

	index = dev->ctl_ainput;

	if (index == 0)
		strcpy(a->name, "Television");
	else
		strcpy(a->name, "Line In");

	a->capability = V4L2_AUDCAP_STEREO;
	a->index = index;

	return 0;
}

static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
	struct em28xx_fh   *fh  = priv;
	struct em28xx      *dev = fh->dev;

	if (a->index != dev->ctl_ainput)
		return -EINVAL;

	return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   id  = qc->id;
	int                   i;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	memset(qc, 0, sizeof(*qc));

	qc->id = id;

	if (!dev->has_msp34xx) {
		for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
			if (qc->id && qc->id == em28xx_qctrl[i].id) {
				memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
				return 0;
			}
		}
	}
	mutex_lock(&dev->lock);
	em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
	mutex_unlock(&dev->lock);

	if (qc->type)
		return 0;
	else
		return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;
	mutex_lock(&dev->lock);

	if (!dev->has_msp34xx)
		rc = em28xx_get_ctrl(dev, ctrl);
	else
		rc = -EINVAL;

	if (rc == -EINVAL) {
		em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
		rc = 0;
	}

	mutex_unlock(&dev->lock);
	return rc;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	u8                    i;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	mutex_lock(&dev->lock);

	if (dev->has_msp34xx)
		em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
	else {
		rc = 1;
		for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
			if (ctrl->id == em28xx_qctrl[i].id) {
				if (ctrl->value < em28xx_qctrl[i].minimum ||
				    ctrl->value > em28xx_qctrl[i].maximum) {
					rc = -ERANGE;
					break;
				}

				rc = em28xx_set_ctrl(dev, ctrl);
				break;
			}
		}
	}

	/* Control not found - try to send it to the attached devices */
	if (rc == 1) {
		em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
		rc = 0;
	}

	mutex_unlock(&dev->lock);
	return rc;
}

static int vidioc_g_tuner(struct file *file, void *priv,
				struct v4l2_tuner *t)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	if (0 != t->index)
		return -EINVAL;

	strcpy(t->name, "Tuner");

	mutex_lock(&dev->lock);

	em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);

	mutex_unlock(&dev->lock);
	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
				struct v4l2_tuner *t)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	if (0 != t->index)
		return -EINVAL;

	mutex_lock(&dev->lock);

	em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);

	mutex_unlock(&dev->lock);
	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;

	f->type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
	f->frequency = dev->ctl_freq;

	return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int                   rc;

	rc = check_dev(dev);
	if (rc < 0)
		return rc;

	if (0 != f->tuner)
		return -EINVAL;

	if (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
		return -EINVAL;
	if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
		return -EINVAL;

	mutex_lock(&dev->lock);

	dev->ctl_freq = f->frequency;
	em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);

	mutex_unlock(&dev->lock);
	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int em28xx_reg_len(int reg)
{
	switch (reg) {
	case EM28XX_R40_AC97LSB:
	case EM28XX_R30_HSCALELOW:
	case EM28XX_R32_VSCALELOW:
		return 2;
	default:
		return 1;
	}
}

static int vidioc_g_register(struct file *file, void *priv,
			     struct v4l2_register *reg)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	int ret;

	if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
		return -EINVAL;

	if (em28xx_reg_len(reg->reg) == 1) {
		ret = em28xx_read_reg(dev, reg->reg);
		if (ret < 0)
			return ret;

		reg->val = ret;
	} else {
		__le64 val = 0;
		ret = em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
						   reg->reg, (char *)&val, 2);
		if (ret < 0)
			return ret;

		reg->val = le64_to_cpu(val);
	}

	return 0;
}

static int vidioc_s_register(struct file *file, void *priv,
			     struct v4l2_register *reg)
{
	struct em28xx_fh      *fh  = priv;
	struct em28xx         *dev = fh->dev;
	__le64 buf;

	buf = cpu_to_le64(reg->val);

	return em28xx_write_regs(dev, reg->reg, (char *)&buf,
				 em28xx_reg_len(reg->reg));
}
#endif