em28xx-video.c

LINUX 2.6.17.4的源码

		f = list_entry(dev->outqueue.next,
				struct em28xx_frame_t, frame);
		list_del(dev->outqueue.next);
		spin_unlock_irqrestore(&dev->queue_lock, lock_flags);

		f->state = F_UNUSED;
		memcpy(b, &f->buf, sizeof(*b));

		if (f->vma_use_count)
			b->flags |= V4L2_BUF_FLAG_MAPPED;

		return 0;
	}
	default:
		return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
				       em28xx_video_do_ioctl);
	}
	return 0;
}

/*
 * em28xx_v4l2_ioctl()
 * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
 */
static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
			     unsigned int cmd, unsigned long arg)
{
	int ret = 0;
	struct em28xx *dev = filp->private_data;

	if (mutex_lock_interruptible(&dev->fileop_lock))
		return -ERESTARTSYS;

	if (dev->state & DEV_DISCONNECTED) {
		em28xx_errdev("v4l2 ioctl: device not present\n");
		mutex_unlock(&dev->fileop_lock);
		return -ENODEV;
	}

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

	ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);

	mutex_unlock(&dev->fileop_lock);

	return ret;
}

static struct file_operations em28xx_v4l_fops = {
	.owner = THIS_MODULE,
	.open = em28xx_v4l2_open,
	.release = em28xx_v4l2_close,
	.ioctl = em28xx_v4l2_ioctl,
	.read = em28xx_v4l2_read,
	.poll = em28xx_v4l2_poll,
	.mmap = em28xx_v4l2_mmap,
	.llseek = no_llseek,
	.compat_ioctl   = v4l_compat_ioctl32,

};

/******************************** usb interface *****************************************/

/*
 * em28xx_init_dev()
 * allocates and inits the device structs, registers i2c bus and v4l device
 */
static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
			   int minor, int model)
{
	struct em28xx *dev = *devhandle;
	int retval = -ENOMEM;
	int errCode, i;
	unsigned int maxh, maxw;

	dev->udev = udev;
	dev->model = model;
	mutex_init(&dev->lock);
	init_waitqueue_head(&dev->open);

	dev->em28xx_write_regs = em28xx_write_regs;
	dev->em28xx_read_reg = em28xx_read_reg;
	dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
	dev->em28xx_write_regs_req = em28xx_write_regs_req;
	dev->em28xx_read_reg_req = em28xx_read_reg_req;
	dev->is_em2800 = em28xx_boards[model].is_em2800;
	dev->has_tuner = em28xx_boards[model].has_tuner;
	dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
	dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
	dev->decoder = em28xx_boards[model].decoder;

	if (tuner >= 0)
		dev->tuner_type = tuner;
	else
		dev->tuner_type = em28xx_boards[model].tuner_type;

	dev->video_inputs = em28xx_boards[model].vchannels;

	for (i = 0; i < TVNORMS; i++)
		if (em28xx_boards[model].norm == tvnorms[i].mode)
			break;
	if (i == TVNORMS)
		i = 0;

	dev->tvnorm = &tvnorms[i];	/* set default norm */

	em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);

	maxw = norm_maxw(dev);
	maxh = norm_maxh(dev);

	/* set default image size */
	dev->width = maxw;
	dev->height = maxh;
	dev->interlaced = EM28XX_INTERLACED_DEFAULT;
	dev->field_size = dev->width * dev->height;
	dev->frame_size =
	    dev->interlaced ? dev->field_size << 1 : dev->field_size;
	dev->bytesperline = dev->width * 2;
	dev->hscale = 0;
	dev->vscale = 0;
	dev->ctl_input = 2;

	/* setup video picture settings for saa7113h */
	memset(&dev->vpic, 0, sizeof(dev->vpic));
	dev->vpic.colour = 128 << 8;
	dev->vpic.hue = 128 << 8;
	dev->vpic.brightness = 128 << 8;
	dev->vpic.contrast = 192 << 8;
	dev->vpic.whiteness = 128 << 8;	/* This one isn't used */
	dev->vpic.depth = 16;
	dev->vpic.palette = VIDEO_PALETTE_YUV422;

	em28xx_pre_card_setup(dev);
#ifdef CONFIG_MODULES
	/* request some modules */
	if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
		request_module("saa7115");
	if (dev->decoder == EM28XX_TVP5150)
		request_module("tvp5150");
	if (dev->has_tuner)
		request_module("tuner");
	if (dev->tda9887_conf)
		request_module("tda9887");
#endif
	errCode = em28xx_config(dev);
	if (errCode) {
		em28xx_errdev("error configuring device\n");
		em28xx_devused&=~(1<<dev->devno);
		kfree(dev);
		return -ENOMEM;
	}

	mutex_lock(&dev->lock);
	/* register i2c bus */
	em28xx_i2c_register(dev);

	/* Do board specific init and eeprom reading */
	em28xx_card_setup(dev);

	/* configure the device */
	em28xx_config_i2c(dev);

	mutex_unlock(&dev->lock);

	errCode = em28xx_config(dev);

#ifdef CONFIG_MODULES
	if (dev->has_msp34xx)
		request_module("msp3400");
#endif
	/* allocate and fill v4l2 device struct */
	dev->vdev = video_device_alloc();
	if (NULL == dev->vdev) {
		em28xx_errdev("cannot allocate video_device.\n");
		em28xx_devused&=~(1<<dev->devno);
		kfree(dev);
		return -ENOMEM;
	}

	dev->vbi_dev = video_device_alloc();
	if (NULL == dev->vbi_dev) {
		em28xx_errdev("cannot allocate video_device.\n");
		kfree(dev->vdev);
		em28xx_devused&=~(1<<dev->devno);
		kfree(dev);
		return -ENOMEM;
	}

	/* Fills VBI device info */
	dev->vbi_dev->type = VFL_TYPE_VBI;
	dev->vbi_dev->hardware = 0;
	dev->vbi_dev->fops = &em28xx_v4l_fops;
	dev->vbi_dev->minor = -1;
	dev->vbi_dev->dev = &dev->udev->dev;
	dev->vbi_dev->release = video_device_release;
	snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
							 "em28xx",dev->devno,"vbi");

	/* Fills CAPTURE device info */
	dev->vdev->type = VID_TYPE_CAPTURE;
	if (dev->has_tuner)
		dev->vdev->type |= VID_TYPE_TUNER;
	dev->vdev->hardware = 0;
	dev->vdev->fops = &em28xx_v4l_fops;
	dev->vdev->minor = -1;
	dev->vdev->dev = &dev->udev->dev;
	dev->vdev->release = video_device_release;
	snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
							 "em28xx",dev->devno,"video");

	list_add_tail(&dev->devlist,&em28xx_devlist);

	/* register v4l2 device */
	mutex_lock(&dev->lock);
	if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
					 video_nr[dev->devno]))) {
		em28xx_errdev("unable to register video device (error=%i).\n",
			      retval);
		mutex_unlock(&dev->lock);
		list_del(&dev->devlist);
		video_device_release(dev->vdev);
		em28xx_devused&=~(1<<dev->devno);
		kfree(dev);
		return -ENODEV;
	}

	if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
					vbi_nr[dev->devno]) < 0) {
		printk("unable to register vbi device\n");
		mutex_unlock(&dev->lock);
		list_del(&dev->devlist);
		video_device_release(dev->vbi_dev);
		video_device_release(dev->vdev);
		em28xx_devused&=~(1<<dev->devno);
		kfree(dev);
		return -ENODEV;
	} else {
		printk("registered VBI\n");
	}

	if (dev->has_msp34xx) {
		/* Send a reset to other chips via gpio */
		em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
		udelay(2500);
		em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
		udelay(2500);

	}
	video_mux(dev, 0);

	mutex_unlock(&dev->lock);

	em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
				dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
				dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);

	return 0;
}

/*
 * em28xx_usb_probe()
 * checks for supported devices
 */
static int em28xx_usb_probe(struct usb_interface *interface,
			    const struct usb_device_id *id)
{
	const struct usb_endpoint_descriptor *endpoint;
	struct usb_device *udev;
	struct usb_interface *uif;
	struct em28xx *dev = NULL;
	int retval = -ENODEV;
	int model,i,nr,ifnum;

	udev = usb_get_dev(interface_to_usbdev(interface));
	ifnum = interface->altsetting[0].desc.bInterfaceNumber;

	/* Check to see next free device and mark as used */
	nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
	em28xx_devused|=1<<nr;

	/* Don't register audio interfaces */
	if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
		em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
				udev->descriptor.idVendor,udev->descriptor.idProduct,
				ifnum,
				interface->altsetting[0].desc.bInterfaceClass);

		em28xx_devused&=~(1<<nr);
		return -ENODEV;
	}

	em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
			udev->descriptor.idVendor,udev->descriptor.idProduct,
			ifnum,
			interface->altsetting[0].desc.bInterfaceClass);

	endpoint = &interface->cur_altsetting->endpoint[1].desc;

	/* check if the the device has the iso in endpoint at the correct place */
	if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
	    USB_ENDPOINT_XFER_ISOC) {
		em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
		em28xx_devused&=~(1<<nr);
		return -ENODEV;
	}
	if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
		em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
		em28xx_devused&=~(1<<nr);
		return -ENODEV;
	}

	model=id->driver_info;

	if (nr >= EM28XX_MAXBOARDS) {
		printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
		em28xx_devused&=~(1<<nr);
		return -ENOMEM;
	}

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL) {
		em28xx_err(DRIVER_NAME ": out of memory!\n");
		em28xx_devused&=~(1<<nr);
		return -ENOMEM;
	}

	snprintf(dev->name, 29, "em28xx #%d", nr);
	dev->devno=nr;

	/* compute alternate max packet sizes */
	uif = udev->actconfig->interface[0];

	dev->num_alt=uif->num_altsetting;
	em28xx_info("Alternate settings: %i\n",dev->num_alt);
//	dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
	dev->alt_max_pkt_size = kmalloc(32*
						dev->num_alt,GFP_KERNEL);
	if (dev->alt_max_pkt_size == NULL) {
		em28xx_errdev("out of memory!\n");
		em28xx_devused&=~(1<<nr);
		return -ENOMEM;
	}

	for (i = 0; i < dev->num_alt ; i++) {
		u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
							wMaxPacketSize);
		dev->alt_max_pkt_size[i] =
		    (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
		em28xx_info("Alternate setting %i, max size= %i\n",i,
							dev->alt_max_pkt_size[i]);
	}

	if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
		model=card[nr];

	if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
		em28xx_errdev( "Your board has no eeprom inside it and thus can't\n"
			"%s: be autodetected.  Please pass card=<n> insmod option to\n"
			"%s: workaround that.  Redirect complaints to the vendor of\n"
			"%s: the TV card. Generic type will be used."
			"%s: Best regards,\n"
			"%s:         -- tux\n",
			dev->name,dev->name,dev->name,dev->name,dev->name);
		em28xx_errdev("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
			dev->name);
		for (i = 0; i < em28xx_bcount; i++) {
			em28xx_errdev("    card=%d -> %s\n", i,
							em28xx_boards[i].name);
		}
	}

	/* allocate device struct */
	retval = em28xx_init_dev(&dev, udev, nr, model);
	if (retval)
		return retval;

	em28xx_info("Found %s\n", em28xx_boards[model].name);

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, dev);
	return 0;
}

/*
 * em28xx_usb_disconnect()
 * called when the device gets diconencted
 * video device will be unregistered on v4l2_close in case it is still open
 */
static void em28xx_usb_disconnect(struct usb_interface *interface)
{
	struct em28xx *dev = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	if (!dev)
		return;

	down_write(&em28xx_disconnect);

	mutex_lock(&dev->lock);

	em28xx_info("disconnecting %s\n", dev->vdev->name);

	wake_up_interruptible_all(&dev->open);

	if (dev->users) {
		em28xx_warn
		    ("device /dev/video%d is open! Deregistration and memory "
		     "deallocation are deferred on close.\n",
				dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);

		dev->state |= DEV_MISCONFIGURED;
		em28xx_uninit_isoc(dev);
		dev->state |= DEV_DISCONNECTED;
		wake_up_interruptible(&dev->wait_frame);
		wake_up_interruptible(&dev->wait_stream);
	} else {
		dev->state |= DEV_DISCONNECTED;
		em28xx_release_resources(dev);
	}

	mutex_unlock(&dev->lock);

	if (!dev->users) {
		kfree(dev->alt_max_pkt_size);
		kfree(dev);
	}

	up_write(&em28xx_disconnect);
}

static struct usb_driver em28xx_usb_driver = {
	.name = "em28xx",
	.probe = em28xx_usb_probe,
	.disconnect = em28xx_usb_disconnect,
	.id_table = em28xx_id_table,
};

static int __init em28xx_module_init(void)
{
	int result;

	printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
	       (EM28XX_VERSION_CODE >> 16) & 0xff,
	       (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
#ifdef SNAPSHOT
	printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
	       SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
#endif

	/* register this driver with the USB subsystem */
	result = usb_register(&em28xx_usb_driver);
	if (result)
		em28xx_err(DRIVER_NAME
			   " usb_register failed. Error number %d.\n", result);

	return result;
}

static void __exit em28xx_module_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&em28xx_usb_driver);
}

module_init(em28xx_module_init);
module_exit(em28xx_module_exit);