[sane-devel] On using the files

[m. allan noah]

On Thu, 11 Dec 2003, Jason Anderson wrote:

> I've been trying to make a simple app which opens up the proper file (/dev/usb/scanner0), and return a message saying it is opened.  But I don't think I have it right.
> Since SANE uses libusb, I've been using those functions, in part the usb_open() function.  I've used the "for" loop to go through the various devices in the usb_devices structure of libusb to try and open it.  Can anyone help me with this little problem?
> 

your question is really vague, but is sounds like you are asking for a bit 
of code to open a scanner device file so you can send your own packets to 
it?

i would not use the kernel usb scanner module (rmmod scanner) i would 
instead use libusb and the usbdevfs instead. see the attached bit of code. 
you will have to change the vendor and device ids.

allan

-- 
"so don't tell us it can't be done, putting down what you don't know.
money isn't our god, integrity will free our souls" - Max Cavalera
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usb_dev_handle *locate_fu(void) 
{
	unsigned char located = 0;
	struct usb_bus *bus;
	struct usb_device *dev;
	usb_dev_handle *device_handle = 0;
	int open_status = 0;
 		
	usb_find_busses();
	usb_find_devices();
 
 	for (bus = usb_busses; bus; bus = bus->next)
	{
		for (dev = bus->devices; dev; dev = dev->next)	
		{
			if (dev->descriptor.idVendor == 0x04c5) 
			{	
				located++;
				device_handle = usb_open(dev);
				printf("FU Device Found @ Address %s \n", dev->filename);
				printf("FU Vendor ID 0x0%x\n",dev->descriptor.idVendor);
				printf("FU Product ID 0x0%x\n",dev->descriptor.idProduct);
			}
			else printf("** usb device %s found **\n", dev->filename);			
		}	
       }

    if (device_handle==0)
        return (0);

    open_status = usb_set_configuration(device_handle,1);
    printf("conf_stat=%d\n",open_status);

    open_status = usb_claim_interface(device_handle,0);
    printf("claim_stat=%d\n",open_status);
	
    //open_status = usb_set_altinterface(device_handle,0);
    //printf("alt_stat=%d\n",open_status);

    return (device_handle);
}