Hi all, I am currently trying to implement a vendor specific gadget driver( bInterfaceClass = 0xFF, enumerating as bulk In/Out device), Basic task of this driver is to send around 500K Bytes of data over bulk In endpoint. Since, it enumerates as vendor specific device, I have wrote a small libusb application on Linux Host side which can talk to my gadget driver. So, currently I am designing how many bytes can be transfered over bulk In endpoint in one attempt.(I understand, wMaxPacketSize for bulk In endpoint is 512 bytes). I tried to investigate using Pendrive, and it shows following output for usbmon, ffff880090667cc0 3741341493 S Bi:2:028:2 -115 32768 < ffff880090667cc0 3741343608 C Bi:2:028:2 0 32768 = d6672e3f d3fc537e 3d2cc447 c0315740 8d1affdc 34984099 81fbbb67 15b40c4f which indicates as it has transfered 32KBytes of data in one attempt. So, I would like to know how & who does takes care of 512 byte fragmentation for this bulkIn endpoint, and Do I need to loop (500K/512) number of times in gadget driver for transferring whole 500K data onto bulk In endpoint with wMaxPacketSize=512 ? more specifically, how should I decide, what should be the value of "size" in following implementation. req->length = size; ret = usb_ep_queue(dev->ep_in, req, GFP_ATOMIC); Thanks lot for any help. Thanks and Regards, Shivdas Gujare -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
