C++ DEB_S函数代码示例

static int video_begin(struct saa7146_fh *fh)
{
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;
	struct saa7146_format *fmt = NULL;
	unsigned int resource;
	int ret = 0, err = 0;

	DEB_EE(("dev:%p, fh:%p\n",dev,fh));

	if ((vv->video_status & STATUS_CAPTURE) != 0) {
		if (vv->video_fh == fh) {
			DEB_S(("already capturing.\n"));
			return 0;
		}
		DEB_S(("already capturing in another open.\n"));
		return -EBUSY;
	}

	if ((vv->video_status & STATUS_OVERLAY) != 0) {
		DEB_S(("warning: suspending overlay video for streaming capture.\n"));
		vv->ov_suspend = vv->video_fh;
		err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
		if (0 != err) {
			DEB_D(("suspending video failed. aborting\n"));
			return err;
		}
	}

	fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
	/* we need to have a valid format set here */
	BUG_ON(NULL == fmt);

	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
	} else {
		resource = RESOURCE_DMA1_HPS;
	}

	ret = saa7146_res_get(fh, resource);
	if (0 == ret) {
		DEB_S(("cannot get capture resource %d\n",resource));
		if (vv->ov_suspend != NULL) {
			saa7146_start_preview(vv->ov_suspend);
			vv->ov_suspend = NULL;
		}
		return -EBUSY;
	}

	/* clear out beginning of streaming bit (rps register 0)*/
	saa7146_write(dev, MC2, MASK_27 );

	/* enable rps0 irqs */
	SAA7146_IER_ENABLE(dev, MASK_27);

	vv->video_fh = fh;
	vv->video_status = STATUS_CAPTURE;

	return 0;
}

static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
{
	struct saa7146_fh *fh = __fh;
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;
	int err;

	DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);

	/* ugly: we need to copy some checks from video_end(),
	   because videobuf_streamoff() relies on the capture running.
	   check and fix this */
	if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
		DEB_S("not capturing\n");
		return 0;
	}

	if (vv->video_fh != fh) {
		DEB_S("capturing, but in another open\n");
		return -EBUSY;
	}

	err = -EINVAL;
	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		err = videobuf_streamoff(&fh->video_q);
	else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
		err = videobuf_streamoff(&fh->vbi_q);
	if (0 != err) {
		DEB_D("warning: videobuf_streamoff() failed\n");
		video_end(fh, file);
	} else {
		err = video_end(fh, file);
	}
	return err;
}

static int video_end(struct saa7146_fh *fh, struct file *file)
{
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;
	struct saa7146_format *fmt = NULL;
	unsigned long flags;
	unsigned int resource;
	u32 dmas = 0;
	DEB_EE(("dev:%p, fh:%p\n",dev,fh));

	if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
		DEB_S(("not capturing.\n"));
		return 0;
	}

	if (vv->video_fh != fh) {
		DEB_S(("capturing, but in another open.\n"));
		return -EBUSY;
	}

	fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
	/* we need to have a valid format set here */
	BUG_ON(NULL == fmt);

	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
		dmas = MASK_22 | MASK_21 | MASK_20;
	} else {
		resource = RESOURCE_DMA1_HPS;
		dmas = MASK_22;
	}
	spin_lock_irqsave(&dev->slock,flags);

	/* disable rps0  */
	saa7146_write(dev, MC1, MASK_28);

	/* disable rps0 irqs */
	SAA7146_IER_DISABLE(dev, MASK_27);

	/* shut down all used video dma transfers */
	saa7146_write(dev, MC1, dmas);

	spin_unlock_irqrestore(&dev->slock, flags);

	vv->video_fh = NULL;
	vv->video_status = 0;

	saa7146_res_free(fh, resource);

	if (vv->ov_suspend != NULL) {
		saa7146_start_preview(vv->ov_suspend);
		vv->ov_suspend = NULL;
	}

	return 0;
}

static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
        unsigned long us1, unsigned long us2)
{
    unsigned long loops;

    /* wait for registers to be programmed */
    loops = us1;
    while (1) {
        if (saa7146_read(dev, MC2) & 2)
            break;
        if (!loops--) {
            printk(KERN_ERR "%s: %s timed out while waiting for "
                   "registers getting programmed\n",
                   dev->name, __func__);
            return -ETIMEDOUT;
        }
        udelay(1);
    }

    /* wait for transfer to complete */
    loops = us2 / 5;
    while (1) {
        if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
            break;
        saa7146_read(dev, MC2);
        if (!loops--) {
            DEB_S(("%s: %s timed out while waiting for transfer "
                   "completion\n", dev->name, __func__));
            return -ETIMEDOUT;
        }
        udelay(5);
    }

    return 0;
}

static int vbi_open(struct saa7146_dev *dev, struct file *file)
{
    struct saa7146_fh *fh = file->private_data;

    u32 arbtr_ctrl	= saa7146_read(dev, PCI_BT_V1);
    int ret = 0;

    DEB_VBI(("dev:%p, fh:%p\n",dev,fh));

    ret = saa7146_res_get(fh, RESOURCE_DMA3_BRS);
    if (0 == ret) {
        DEB_S(("cannot get vbi RESOURCE_DMA3_BRS resource\n"));
        return -EBUSY;
    }

    /* adjust arbitrition control for video dma 3 */
    arbtr_ctrl &= ~0x1f0000;
    arbtr_ctrl |=  0x1d0000;
    saa7146_write(dev, PCI_BT_V1, arbtr_ctrl);
    saa7146_write(dev, MC2, (MASK_04|MASK_20));

    memset(&fh->vbi_fmt,0,sizeof(fh->vbi_fmt));

    fh->vbi_fmt.sampling_rate	= 27000000;
    fh->vbi_fmt.offset		= 248; /* todo */
    fh->vbi_fmt.samples_per_line	= vbi_pixel_to_capture;
    fh->vbi_fmt.sample_format	= V4L2_PIX_FMT_GREY;

    fh->vbi_fmt.start[0] = 5;
    fh->vbi_fmt.count[0] = 16;
    fh->vbi_fmt.start[1] = 312;
    fh->vbi_fmt.count[1] = 16;

    videobuf_queue_sg_init(&fh->vbi_q, &vbi_qops,
                           &dev->pci->dev, &dev->slock,
                           V4L2_BUF_TYPE_VBI_CAPTURE,
                           V4L2_FIELD_SEQ_TB,
                           sizeof(struct saa7146_buf),
                           file);

    init_timer(&fh->vbi_read_timeout);
    fh->vbi_read_timeout.function = vbi_read_timeout;
    fh->vbi_read_timeout.data = (unsigned long)file;

    /* initialize the brs */
    if ( 0 != (SAA7146_USE_PORT_B_FOR_VBI & dev->ext_vv_data->flags)) {
        saa7146_write(dev, BRS_CTRL, MASK_30|MASK_29 | (7 << 19));
    } else {
        saa7146_write(dev, BRS_CTRL, 0x00000001);

        if (0 != (ret = vbi_workaround(dev))) {
            DEB_VBI(("vbi workaround failed!\n"));
            /* return ret;*/
        }
    }

    /* upload brs register */
    saa7146_write(dev, MC2, (MASK_08|MASK_24));
    return 0;
}

static int __init dpc_init_module(void)
{
	if( 0 != saa7146_register_extension(&extension)) {
		DEB_S(("failed to register extension.\n"));
		return -ENODEV;
	}

	return 0;
}

static int __init mxb_init_module(void)
{
	if (saa7146_register_extension(&extension)) {
		DEB_S("failed to register extension\n");
		return -ENODEV;
	}

	return 0;
}

static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
	struct saa7146_fh *fh = file->private_data;
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;
	ssize_t ret = 0;

	DEB_EE(("called.\n"));

	if ((vv->video_status & STATUS_CAPTURE) != 0) {
		/* fixme: should we allow read() captures while streaming capture? */
		if (vv->video_fh == fh) {
			DEB_S(("already capturing.\n"));
			return -EBUSY;
		}
		DEB_S(("already capturing in another open.\n"));
		return -EBUSY;
	}

	ret = video_begin(fh);
	if( 0 != ret) {
		goto out;
	}

	ret = videobuf_read_one(&fh->video_q , data, count, ppos,
				file->f_flags & O_NONBLOCK);
	if (ret != 0) {
		video_end(fh, file);
	} else {
		ret = video_end(fh, file);
	}
out:
	/* restart overlay if it was active before */
	if (vv->ov_suspend != NULL) {
		saa7146_start_preview(vv->ov_suspend);
		vv->ov_suspend = NULL;
	}

	return ret;
}

static int mxb_probe(struct saa7146_dev *dev)
{
	struct mxb *mxb = NULL;

	mxb = kzalloc(sizeof(struct mxb), GFP_KERNEL);
	if (mxb == NULL) {
		DEB_D(("not enough kernel memory.\n"));
		return -ENOMEM;
	}

	snprintf(mxb->i2c_adapter.name, sizeof(mxb->i2c_adapter.name), "mxb%d", mxb_num);

	saa7146_i2c_adapter_prepare(dev, &mxb->i2c_adapter, SAA7146_I2C_BUS_BIT_RATE_480);
	if (i2c_add_adapter(&mxb->i2c_adapter) < 0) {
		DEB_S(("cannot register i2c-device. skipping.\n"));
		kfree(mxb);
		return -EFAULT;
	}

	mxb->saa7111a = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"saa7115", "saa7111", I2C_SAA7111A);
	mxb->tea6420_1 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"tea6420", "tea6420", I2C_TEA6420_1);
	mxb->tea6420_2 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"tea6420", "tea6420", I2C_TEA6420_2);
	mxb->tea6415c = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"tea6415c", "tea6415c", I2C_TEA6415C);
	mxb->tda9840 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"tda9840", "tda9840", I2C_TDA9840);
	mxb->tuner = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"tuner", "tuner", I2C_TUNER);
	if (v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
			"saa5246a", "saa5246a", I2C_SAA5246A)) {
		printk(KERN_INFO "mxb: found teletext decoder\n");
	}

	/* check if all devices are present */
	if (!mxb->tea6420_1 || !mxb->tea6420_2 || !mxb->tea6415c ||
	    !mxb->tda9840 || !mxb->saa7111a || !mxb->tuner) {
		printk("mxb: did not find all i2c devices. aborting\n");
		i2c_del_adapter(&mxb->i2c_adapter);
		kfree(mxb);
		return -ENODEV;
	}

	/* all devices are present, probe was successful */

	/* we store the pointer in our private data field */
	dev->ext_priv = mxb;

	return 0;
}

static int mxb_probe(struct saa7146_dev *dev)
{
    struct mxb *mxb = NULL;

    mxb = kzalloc(sizeof(struct mxb), GFP_KERNEL);
    if (mxb == NULL) {
        DEB_D("not enough kernel memory\n");
        return -ENOMEM;
    }

    snprintf(mxb->i2c_adapter.name, sizeof(mxb->i2c_adapter.name), "mxb%d", mxb_num);

    saa7146_i2c_adapter_prepare(dev, &mxb->i2c_adapter, SAA7146_I2C_BUS_BIT_RATE_480);
    if (i2c_add_adapter(&mxb->i2c_adapter) < 0) {
        DEB_S("cannot register i2c-device. skipping.\n");
        kfree(mxb);
        return -EFAULT;
    }

    mxb->saa7111a = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                        "saa7111", I2C_SAA7111A, NULL);
    mxb->tea6420_1 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                         "tea6420", I2C_TEA6420_1, NULL);
    mxb->tea6420_2 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                         "tea6420", I2C_TEA6420_2, NULL);
    mxb->tea6415c = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                        "tea6415c", I2C_TEA6415C, NULL);
    mxb->tda9840 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                       "tda9840", I2C_TDA9840, NULL);
    mxb->tuner = v4l2_i2c_new_subdev(&dev->v4l2_dev, &mxb->i2c_adapter,
                                     "tuner", I2C_TUNER, NULL);


    if (!mxb->tea6420_1 || !mxb->tea6420_2 || !mxb->tea6415c ||
            !mxb->tda9840 || !mxb->saa7111a || !mxb->tuner) {
        pr_err("did not find all i2c devices. aborting\n");
        i2c_del_adapter(&mxb->i2c_adapter);
        kfree(mxb);
        return -ENODEV;
    }




    dev->ext_priv = mxb;

    return 0;
}

static int vbi_open(struct saa7146_dev *dev, struct file *file)
{
	struct saa7146_fh *fh = file->private_data;
	struct saa7146_vv *vv = fh->dev->vv_data;

	u32 arbtr_ctrl	= saa7146_read(dev, PCI_BT_V1);
	int ret = 0;

	DEB_VBI("dev:%p, fh:%p\n", dev, fh);

	ret = saa7146_res_get(fh, RESOURCE_DMA3_BRS);
	if (0 == ret) {
		DEB_S("cannot get vbi RESOURCE_DMA3_BRS resource\n");
		return -EBUSY;
	}

	/* adjust arbitrition control for video dma 3 */
	arbtr_ctrl &= ~0x1f0000;
	arbtr_ctrl |=  0x1d0000;
	saa7146_write(dev, PCI_BT_V1, arbtr_ctrl);
	saa7146_write(dev, MC2, (MASK_04|MASK_20));

	videobuf_queue_sg_init(&fh->vbi_q, &vbi_qops,
			    &dev->pci->dev, &dev->slock,
			    V4L2_BUF_TYPE_VBI_CAPTURE,
			    V4L2_FIELD_SEQ_TB, // FIXME: does this really work?
			    sizeof(struct saa7146_buf),
			    file, &dev->v4l2_lock);

	vv->vbi_read_timeout.function = vbi_read_timeout;
	vv->vbi_read_timeout.data = (unsigned long)file;

	/* initialize the brs */
	if ( 0 != (SAA7146_USE_PORT_B_FOR_VBI & dev->ext_vv_data->flags)) {
		saa7146_write(dev, BRS_CTRL, MASK_30|MASK_29 | (7 << 19));
	} else {
		saa7146_write(dev, BRS_CTRL, 0x00000001);

		if (0 != (ret = vbi_workaround(dev))) {
			DEB_VBI("vbi workaround failed!\n");
			/* return ret;*/
		}
	}

	/* upload brs register */
	saa7146_write(dev, MC2, (MASK_08|MASK_24));
	return 0;
}

static int vidioc_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
{
	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
	struct saa7146_vv *vv = dev->vv_data;
	struct saa7146_format *fmt;

	DEB_EE(("VIDIOC_S_FBUF\n"));

	if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
		return -EPERM;

	/* check args */
	fmt = saa7146_format_by_fourcc(dev, fb->fmt.pixelformat);
	if (NULL == fmt)
		return -EINVAL;

	/* planar formats are not allowed for overlay video, clipping and video dma would clash */
	if (fmt->flags & FORMAT_IS_PLANAR)
		DEB_S(("planar pixelformat '%4.4s' not allowed for overlay\n",
					(char *)&fmt->pixelformat));

	/* check if overlay is running */
	if (IS_OVERLAY_ACTIVE(fh) != 0) {
		if (vv->video_fh != fh) {
			DEB_D(("refusing to change framebuffer informations while overlay is active in another open.\n"));
			return -EBUSY;
		}
	}

	mutex_lock(&dev->lock);

	/* ok, accept it */
	vv->ov_fb = *fb;
	vv->ov_fmt = fmt;

	if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
		vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
		DEB_D(("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline));
	}

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

/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
        unsigned long us1, unsigned long us2)
{
    unsigned long timeout;
    int err;

    /* wait for registers to be programmed */
    timeout = jiffies + usecs_to_jiffies(us1);
    while (1) {
        err = time_after(jiffies, timeout);
        if (saa7146_read(dev, MC2) & 2)
            break;
        if (err) {
            printk(KERN_ERR "%s: %s timed out while waiting for "
                   "registers getting programmed\n",
                   dev->name, __func__);
            return -ETIMEDOUT;
        }
        msleep(1);
    }

    /* wait for transfer to complete */
    timeout = jiffies + usecs_to_jiffies(us2);
    while (1) {
        err = time_after(jiffies, timeout);
        if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
            break;
        saa7146_read(dev, MC2);
        if (err) {
            DEB_S(("%s: %s timed out while waiting for transfer "
                   "completion\n",	dev->name, __func__));
            return -ETIMEDOUT;
        }
        msleep(1);
    }

    return 0;
}

int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
{
	struct saa7146_fh *fh  = file->private_data;
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;

	int err = 0, result = 0, ee = 0;

	struct saa7146_use_ops *ops;
	struct videobuf_queue *q;

	/* check if extension handles the command */
	for(ee = 0; dev->ext_vv_data->ioctls[ee].flags != 0; ee++) {
		if( cmd == dev->ext_vv_data->ioctls[ee].cmd )
			break;
	}

	if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_EXCLUSIVE) ) {
		DEB_D(("extension handles ioctl exclusive.\n"));
		result = dev->ext_vv_data->ioctl(fh, cmd, arg);
		return result;
	}
	if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_BEFORE) ) {
		DEB_D(("extension handles ioctl before.\n"));
		result = dev->ext_vv_data->ioctl(fh, cmd, arg);
		if( -EAGAIN != result ) {
			return result;
		}
	}

	/* fixme: add handle "after" case (is it still needed?) */

	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
		ops = &saa7146_video_uops;
		q = &fh->video_q;
		break;
		}
	case V4L2_BUF_TYPE_VBI_CAPTURE: {
		ops = &saa7146_vbi_uops;
		q = &fh->vbi_q;
		break;
		}
	default:
		BUG();
		return 0;
	}

	switch (cmd) {
	case VIDIOC_QUERYCAP:
	{
		struct v4l2_capability *cap = arg;
		memset(cap,0,sizeof(*cap));

		DEB_EE(("VIDIOC_QUERYCAP\n"));

		strcpy(cap->driver, "saa7146 v4l2");
		strlcpy(cap->card, dev->ext->name, sizeof(cap->card));
		sprintf(cap->bus_info,"PCI:%s", pci_name(dev->pci));
		cap->version = SAA7146_VERSION_CODE;
		cap->capabilities =
			V4L2_CAP_VIDEO_CAPTURE |
			V4L2_CAP_VIDEO_OVERLAY |
			V4L2_CAP_READWRITE |
			V4L2_CAP_STREAMING;
		cap->capabilities |= dev->ext_vv_data->capabilities;
		return 0;
	}
	case VIDIOC_G_FBUF:
	{
		struct v4l2_framebuffer *fb = arg;

		DEB_EE(("VIDIOC_G_FBUF\n"));

		*fb = vv->ov_fb;
		fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
		return 0;
	}
	case VIDIOC_S_FBUF:
	{
		struct v4l2_framebuffer *fb = arg;
		struct saa7146_format *fmt;

		DEB_EE(("VIDIOC_S_FBUF\n"));

		if(!capable(CAP_SYS_ADMIN) &&
		   !capable(CAP_SYS_RAWIO))
			return -EPERM;

		/* check args */
		fmt = format_by_fourcc(dev,fb->fmt.pixelformat);
		if (NULL == fmt) {
			return -EINVAL;
		}

		/* planar formats are not allowed for overlay video, clipping and video dma would clash */
		if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
			DEB_S(("planar pixelformat '%4.4s' not allowed for overlay\n",(char *)&fmt->pixelformat));
		}

//.........这里部分代码省略.........

static int mxb_probe(struct saa7146_dev* dev)
{
	struct mxb* mxb = NULL;
	int result;

	if ((result = request_module("saa7111")) < 0) {
		printk("mxb: saa7111 i2c module not available.\n");
		return -ENODEV;
	}
	if ((result = request_module("tea6420")) < 0) {
		printk("mxb: tea6420 i2c module not available.\n");
		return -ENODEV;
	}
	if ((result = request_module("tea6415c")) < 0) {
		printk("mxb: tea6415c i2c module not available.\n");
		return -ENODEV;
	}
	if ((result = request_module("tda9840")) < 0) {
		printk("mxb: tda9840 i2c module not available.\n");
		return -ENODEV;
	}
	if ((result = request_module("tuner")) < 0) {
		printk("mxb: tuner i2c module not available.\n");
		return -ENODEV;
	}

	mxb = kzalloc(sizeof(struct mxb), GFP_KERNEL);
	if( NULL == mxb ) {
		DEB_D(("not enough kernel memory.\n"));
		return -ENOMEM;
	}

	mxb->i2c_adapter = (struct i2c_adapter) {
		.class = I2C_CLASS_TV_ANALOG,
		.name = "mxb",
	};

	saa7146_i2c_adapter_prepare(dev, &mxb->i2c_adapter, SAA7146_I2C_BUS_BIT_RATE_480);
	if(i2c_add_adapter(&mxb->i2c_adapter) < 0) {
		DEB_S(("cannot register i2c-device. skipping.\n"));
		kfree(mxb);
		return -EFAULT;
	}

	/* loop through all i2c-devices on the bus and look who is there */
	device_for_each_child(&mxb->i2c_adapter.dev, mxb, mxb_check_clients);

	/* check if all devices are present */
	if (!mxb->tea6420_1 || !mxb->tea6420_2 || !mxb->tea6415c ||
	    !mxb->tda9840 || !mxb->saa7111a || !mxb->tuner) {
		printk("mxb: did not find all i2c devices. aborting\n");
		i2c_del_adapter(&mxb->i2c_adapter);
		kfree(mxb);
		return -ENODEV;
	}

	/* all devices are present, probe was successful */

	/* we store the pointer in our private data field */
	dev->ext_priv = mxb;

	return 0;
}

/* some init data for the saa7740, the so-called 'sound arena module'.
   there are no specs available, so we simply use some init values */
static struct {
	int	length;
	char	data[9];
} mxb_saa7740_init[] = {
	{ 3, { 0x80, 0x00, 0x00 } },{ 3, { 0x80, 0x89, 0x00 } },
	{ 3, { 0x80, 0xb0, 0x0a } },{ 3, { 0x00, 0x00, 0x00 } },
	{ 3, { 0x49, 0x00, 0x00 } },{ 3, { 0x4a, 0x00, 0x00 } },
	{ 3, { 0x4b, 0x00, 0x00 } },{ 3, { 0x4c, 0x00, 0x00 } },
	{ 3, { 0x4d, 0x00, 0x00 } },{ 3, { 0x4e, 0x00, 0x00 } },
	{ 3, { 0x4f, 0x00, 0x00 } },{ 3, { 0x50, 0x00, 0x00 } },
	{ 3, { 0x51, 0x00, 0x00 } },{ 3, { 0x52, 0x00, 0x00 } },
	{ 3, { 0x53, 0x00, 0x00 } },{ 3, { 0x54, 0x00, 0x00 } },
	{ 3, { 0x55, 0x00, 0x00 } },{ 3, { 0x56, 0x00, 0x00 } },
	{ 3, { 0x57, 0x00, 0x00 } },{ 3, { 0x58, 0x00, 0x00 } },
	{ 3, { 0x59, 0x00, 0x00 } },{ 3, { 0x5a, 0x00, 0x00 } },
	{ 3, { 0x5b, 0x00, 0x00 } },{ 3, { 0x5c, 0x00, 0x00 } },
	{ 3, { 0x5d, 0x00, 0x00 } },{ 3, { 0x5e, 0x00, 0x00 } },
	{ 3, { 0x5f, 0x00, 0x00 } },{ 3, { 0x60, 0x00, 0x00 } },
	{ 3, { 0x61, 0x00, 0x00 } },{ 3, { 0x62, 0x00, 0x00 } },
	{ 3, { 0x63, 0x00, 0x00 } },{ 3, { 0x64, 0x00, 0x00 } },
	{ 3, { 0x65, 0x00, 0x00 } },{ 3, { 0x66, 0x00, 0x00 } },
	{ 3, { 0x67, 0x00, 0x00 } },{ 3, { 0x68, 0x00, 0x00 } },
	{ 3, { 0x69, 0x00, 0x00 } },{ 3, { 0x6a, 0x00, 0x00 } },
	{ 3, { 0x6b, 0x00, 0x00 } },{ 3, { 0x6c, 0x00, 0x00 } },
	{ 3, { 0x6d, 0x00, 0x00 } },{ 3, { 0x6e, 0x00, 0x00 } },
	{ 3, { 0x6f, 0x00, 0x00 } },{ 3, { 0x70, 0x00, 0x00 } },
	{ 3, { 0x71, 0x00, 0x00 } },{ 3, { 0x72, 0x00, 0x00 } },
	{ 3, { 0x73, 0x00, 0x00 } },{ 3, { 0x74, 0x00, 0x00 } },
	{ 3, { 0x75, 0x00, 0x00 } },{ 3, { 0x76, 0x00, 0x00 } },
	{ 3, { 0x77, 0x00, 0x00 } },{ 3, { 0x41, 0x00, 0x42 } },
	{ 3, { 0x42, 0x10, 0x42 } },{ 3, { 0x43, 0x20, 0x42 } },
	{ 3, { 0x44, 0x30, 0x42 } },{ 3, { 0x45, 0x00, 0x01 } },
	{ 3, { 0x46, 0x00, 0x01 } },{ 3, { 0x47, 0x00, 0x01 } },
	{ 3, { 0x48, 0x00, 0x01 } },
//.........这里部分代码省略.........