Hello, I am developing simple loopback using gadgetfs, but I am a bit confused as to how gadgefs knows that host initiated IN transfer. Gadgetfs use read/write on endpoints, so as to my understanding, it can only: 1. When using "read" on OUT endpoint - accept a new transfer from host to device. 2. When using "write" on IN endpoint - start transfer from device to host . (1) above seems to be simple to understand, but I have misunderstanding about (2): Isn't it that a write into IN endpoint should be accepted only when host initiated a transaction (device should not initiate transaction by itself) ? If it must , than How does gadget knows that host initiated a transaction in the IN endpoint ? (it probably need to be checked before doing the write in the IN transaction) Thank you, ranran -- 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
