Hi, On Tuesday 16 June 2009 07:23:31 Greg Kroah-Hartman wrote: > From: Bryan Wu <cooloney@xxxxxxxxxx> > > Funtions added: > - setup all the USB audio class device descriptors > - handle class specific setup request > - receive data from USB host by ISO transfer > - play audio data by ALSA sound card > - open and setup playback PCM interface > - set default playback PCM parameters > - provide playback functions for USB audio driver > - provide PCM parameters set/get functions > > Test on: > - Host: Ubuntu 8.10, kernel 2.6.27 > - Gadget: EZKIT-BF548 with ASoC AD1980 codec > > Todo: > - add real Mute control code > - add real Volume control code > - maybe find another way to replace dynamic buffer handling > with static buffer allocation > - test on Windows system > - provide control interface to handle mute/volume control > - provide capture interface in the future > - test on BF527, other USB device controler and other audio codec I've tested the driver on a TI DM355 platform and it doesn't work correctly. I can get audio data to stream to the device, but buffer underruns/overruns kill the experience. I've written another USB audio class gadget driver that doesn't interface to the ALSA device directly but exposes an ALSA interface to userspace. It requires a userspace application to transfer audio data between the real audio device and this 'fake' USB audio device. I'll post the code in a few days after cleaning it up. Best regards, Laurent Pinchart -- 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
