On Thu, 28 Nov 2013, Bhavik Kothari wrote: > Hi Greg / Alan, > > Yes, I have read Alan's response, and I have implemented the same way > (Alternate setting is zero & it has endpoints, and Endpoint max packet > size is 64 bytes instead of 1024 bytes). Now, Windows CV gets passed & > Host detects HID (keyboard) driver too. > > Actually I wanted to know for a knowledge purpose, if I have multiple > alternate settings then how Host should do set interface with alternate > setting (other than zero) for periodic (Interrupt & Isochronous) transfers. The driver on the host has to know how to handle the alternate settings. For example, the snd-usb-audio driver knows that it should install the proper alternate setting for audio USB devices, depending on the audio data rate. However, the usbhid driver does not know about alternate settings for USB HID devices. That's why it wasn't able to handle your device. > Thanks for your help Alan. You're welcome. Alan Stern -- 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
