cpia_usb.c

cpia usb摄像头的驱动程序源码。需要video4linux和i2c-core支持

	return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
			 packet[1] + (packet[0] << 8),
			 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			 packet[2] + (packet[3] << 8), 
			 packet[4] + (packet[5] << 8), buf, size, HZ);
}

static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data)
{
	int err = 0;
	int databytes;
	struct usb_cpia *ucpia = (struct usb_cpia *)privdata;
	struct usb_device *udev = ucpia->dev;

	if (!udev) {
		DBG("Internal driver error: udev is NULL\n");
		return -EINVAL;
	}

	if (!command) {
		DBG("Internal driver error: command is NULL\n");
		return -EINVAL;
	}

	databytes = (((int)command[7])<<8) | command[6];

	if (command[0] == DATA_IN) {
		u8 buffer[8];

		if (!data) {
			DBG("Internal driver error: data is NULL\n");
			return -EINVAL;
		}

		err = ReadPacket(udev, command, buffer, 8);
		if (err < 0)
			return err;

		memcpy(data, buffer, databytes);
	} else if(command[0] == DATA_OUT)
		WritePacket(udev, command, data, databytes);
	else {
		DBG("Unexpected first byte of command: %x\n", command[0]);
		err = -EINVAL;
	}

	return 0;
}

static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
	void *cbdata)
{
	return -ENODEV;
}

static int cpia_usb_streamStart(void *privdata)
{
	return -ENODEV;
}

static int cpia_usb_streamStop(void *privdata)
{
	return -ENODEV;
}

static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock)
{
	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
	struct framebuf *mybuff;

	if (!ucpia || !ucpia->present)
		return -1;
  
	if (ucpia->curbuff->status != FRAME_READY)
		interruptible_sleep_on(&ucpia->wq_stream);
	else
		DBG("Frame already waiting!\n");

	mybuff = ucpia->curbuff;

	if (!mybuff)
		return -1;
  
	if (mybuff->status != FRAME_READY || mybuff->length < 4) {
		DBG("Something went wrong!\n");
		return -1;
	}

	memcpy(frame, mybuff->data, mybuff->length);
	mybuff->status = FRAME_EMPTY;
  
/*   DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n",  */
/*       mybuff->length, frame[0], frame[1], */
/*       frame[mybuff->length-4], frame[mybuff->length-3],  */
/*       frame[mybuff->length-2], frame[mybuff->length-1]); */

	return mybuff->length;
}

static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
{
	if (!ucpia->streaming)
		return;

	ucpia->streaming = 0;

	/* Set packet size to 0 */
	if (try) {
		int ret;

		ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
		if (ret < 0) {
			printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
			return;
		}
		ucpia->alt = 0;
	}

	/* Unschedule all of the iso td's */
	if (ucpia->sbuf[1].urb) {
		usb_unlink_urb(ucpia->sbuf[1].urb);
		usb_free_urb(ucpia->sbuf[1].urb);
		ucpia->sbuf[1].urb = NULL;
	}

	if (ucpia->sbuf[1].data) {
		kfree(ucpia->sbuf[1].data);
		ucpia->sbuf[1].data = NULL;
	}
 
	if (ucpia->sbuf[0].urb) {
		usb_unlink_urb(ucpia->sbuf[0].urb);
		usb_free_urb(ucpia->sbuf[0].urb);
		ucpia->sbuf[0].urb = NULL;
	}

	if (ucpia->sbuf[0].data) {
		kfree(ucpia->sbuf[0].data);
		ucpia->sbuf[0].data = NULL;
	}
}

static int cpia_usb_close(void *privdata)
{
	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;

	if(!ucpia)
		return -ENODEV;

	ucpia->open = 0;

	/* ucpia->present = 0 protects against trying to reset the
	 * alt setting if camera is physically disconnected while open */
	cpia_usb_free_resources(ucpia, ucpia->present);

	return 0;
}

int cpia_usb_init(void)
{

	/* return -ENODEV; */
	return 0;
}

/* Probing and initializing */

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static void *cpia_probe(struct usb_device *udev, unsigned int ifnum,
			const struct usb_device_id *id)
{
	struct usb_interface_descriptor *interface;
#else
static int cpia_probe(struct usb_interface *intf,
		      const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_host_interface *interface;
#endif
	struct usb_cpia *ucpia;
	struct cam_data *cam;
	int ret;
  
	/* A multi-config CPiA camera? */
	if (udev->descriptor.bNumConfigurations != 1)
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
		return NULL;
#else
		return -ENODEV;
#endif


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
	interface = &udev->actconfig->interface[ifnum].altsetting[0];
#else
	interface = &intf->altsetting[0];
#endif
	printk(KERN_INFO "USB CPiA camera found\n");

	ucpia = kmalloc(sizeof(*ucpia), GFP_KERNEL);
	if (!ucpia) {
		printk(KERN_ERR "couldn't kmalloc cpia struct\n");
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
		return NULL;
#else
		return -ENOMEM;
#endif
	}

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

	ucpia->dev = udev;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
	ucpia->iface = interface->bInterfaceNumber;
#else
	ucpia->iface = interface->desc.bInterfaceNumber;
#endif
	init_waitqueue_head(&ucpia->wq_stream);

	ucpia->buffers[0] = vmalloc(sizeof(*ucpia->buffers[0]));
	if (!ucpia->buffers[0]) {
		printk(KERN_ERR "couldn't vmalloc frame buffer 0\n");
		goto fail_alloc_0;
	}

	ucpia->buffers[1] = vmalloc(sizeof(*ucpia->buffers[1]));
	if (!ucpia->buffers[1]) {
		printk(KERN_ERR "couldn't vmalloc frame buffer 1\n");
		goto fail_alloc_1;
	}

	ucpia->buffers[2] = vmalloc(sizeof(*ucpia->buffers[2]));
	if (!ucpia->buffers[2]) {
		printk(KERN_ERR "couldn't vmalloc frame buffer 2\n");
		goto fail_alloc_2;
	}

	ucpia->buffers[0]->next = ucpia->buffers[1];
	ucpia->buffers[1]->next = ucpia->buffers[2];
	ucpia->buffers[2]->next = ucpia->buffers[0];

	ret = usb_set_interface(udev, ucpia->iface, 0);
	if (ret < 0) {
		printk(KERN_ERR "cpia_probe: usb_set_interface error (ret = %d)\n", ret);
		/* goto fail_all; */
	}
	ucpia->alt = 0;

	/* Before register_camera, important */
	ucpia->present = 1;
  
	cam = cpia_register_camera(&cpia_usb_ops, ucpia);
	if (!cam) {
		LOG("failed to cpia_register_camera\n");
		goto fail_all;
	}

	spin_lock( &cam_list_lock_usb );
	list_add( &cam->cam_data_list, &cam_list );
	spin_unlock( &cam_list_lock_usb );

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
	return cam;
#else
	usb_set_intfdata(intf, cam);
	return 0;
#endif

fail_all:
	vfree(ucpia->buffers[2]);
	ucpia->buffers[2] = NULL;
fail_alloc_2:
	vfree(ucpia->buffers[1]);
	ucpia->buffers[1] = NULL;
fail_alloc_1:
	vfree(ucpia->buffers[0]);
	ucpia->buffers[0] = NULL;
fail_alloc_0:
	kfree(ucpia);

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
	return NULL;
#else
	return -EIO;
#endif

}

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static void cpia_disconnect(struct usb_device *dev, void *ptr);
#else
static void cpia_disconnect(struct usb_interface *intf);
#endif

static struct usb_device_id cpia_id_table [] = {
	{ USB_DEVICE(0x0553, 0x0002) },
	{ USB_DEVICE(0x0813, 0x0001) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, cpia_id_table);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,10))
MODULE_LICENSE("GPL");
#endif

static struct usb_driver cpia_driver = {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
	name:		"cpia",
	probe:		cpia_probe,
	disconnect:	cpia_disconnect,
	id_table:	cpia_id_table,
#else
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,70))
	.owner          = THIS_MODULE,
#endif
	.name		= "cpia",
	.probe		= cpia_probe,
	.disconnect	= cpia_disconnect,
	.id_table	= cpia_id_table,
#endif
};

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static void cpia_disconnect(struct usb_device *udev, void *ptr)
{
	struct cam_data *cam = (struct cam_data *) ptr;
#else
static void cpia_disconnect(struct usb_interface *intf)
{
	struct cam_data *cam = usb_get_intfdata(intf);
	struct usb_device *udev;
#endif
	struct usb_cpia *ucpia;  

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
	usb_set_intfdata(intf, NULL);
#endif
	if (!cam)
		return;

	ucpia = (struct usb_cpia *) cam->lowlevel_data;  
	spin_lock( &cam_list_lock_usb );
	list_del(&cam->cam_data_list);
	spin_unlock( &cam_list_lock_usb );
	
	ucpia->present = 0;
	cpia_unregister_camera(cam);
	if(ucpia->open)
		cpia_usb_close(cam->lowlevel_data);

	ucpia->curbuff->status = FRAME_ERROR;
	if (waitqueue_active(&ucpia->wq_stream))
		wake_up_interruptible(&ucpia->wq_stream);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,75))
	udev = interface_to_usbdev(intf);
	usb_driver_release_interface(&cpia_driver,
				     udev->actconfig->interface[0]);
#else
	usb_driver_release_interface(&cpia_driver,
				     &udev->actconfig->interface[0]);
#endif
	ucpia->curbuff = ucpia->workbuff = NULL;
	if (ucpia->buffers[2]) {
		vfree(ucpia->buffers[2]);
		ucpia->buffers[2] = NULL;
	}
	if (ucpia->buffers[1]) {
		vfree(ucpia->buffers[1]);
		ucpia->buffers[1] = NULL;
	}
	if (ucpia->buffers[0]) {
		vfree(ucpia->buffers[0]);
		ucpia->buffers[0] = NULL;
	}

	cam->lowlevel_data = NULL;
	kfree(ucpia);
}

static int __init usb_cpia_init(void)
{
	printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT, 
	       CPIA_USB_MAJ_VER,CPIA_USB_MIN_VER,CPIA_USB_PATCH_VER);

	spin_lock_init(&cam_list_lock_usb);
	return usb_register(&cpia_driver);
}

static void __exit usb_cpia_cleanup(void)
{
	usb_deregister(&cpia_driver);
}

module_init (usb_cpia_init);
module_exit (usb_cpia_cleanup);