Hi, This patch adds USB Audio Device Class 3.0 [1] function support to gadget subsystem. I didn't add UAC3 support to legacy gadget as it will make preprocessor configuration too complex (UAC3 device must have two configurations for backward compatibility, first is UAC1/2 and second is UAC3), yet also I'm too lazy to do that and verify all possible configurations. For modern ConfigFS interface I'll provide my configuration for testing below; testing was done on a BeagleBone Black board. This patch depends on uac3 header files from include dir which I'll post as part of ALSA host UAC3 patch and will provide the link to it here. uac_3 ------------ mkdir cfg mount none cfg -t configfs mkdir cfg/usb_gadget/g1 cd cfg/usb_gadget/g1 mkdir configs/c.1 mkdir functions/uac3.0 mkdir strings/0x409 mkdir configs/c.1/strings/0x409 echo 0x0101 > idProduct echo 0x1d6b > idVendor echo my-serial-num > strings/0x409/serialnumber echo my-manufacturer > strings/0x409/manufacturer echo "Test gadget" > strings/0x409/product echo "Conf 1" > configs/c.1/strings/0x409/configuration echo 120 > configs/c.1/MaxPower ln -s functions/uac3.0 configs/c.1 echo musb-hdrc.0 > UDC uac_3 + uac2 ------------ mkdir cfg mount none cfg -t configfs mkdir cfg/usb_gadget/g1 cd cfg/usb_gadget/g1 mkdir configs/c.1 mkdir functions/uac2.0 mkdir strings/0x409 mkdir configs/c.1/strings/0x409 echo "Test gadget" > strings/0x409/product echo "Conf 1" > configs/c.1/strings/0x409/configuration echo 120 > configs/c.1/MaxPower ln -s functions/uac2.0 configs/c.1 mkdir configs/c.2 mkdir functions/uac3.0 mkdir strings/0x409 mkdir configs/c.2/strings/0x409 echo "Conf 2" > configs/c.2/strings/0x409/configuration echo 120 > configs/c.2/MaxPower ln -s functions/uac3.0 configs/c.2 echo 0x0101 > idProduct echo 0x1d6b > idVendor echo my-serial-num > strings/0x409/serialnumber echo my-manufacturer > strings/0x409/manufacturer echo musb-hdrc.0 > UDC [1] http://www.usb.org/developers/docs/devclass_docs/USB_Audio_v3.0.zip Ruslan Bilovol (1): usb: gadget: add USB Audio Device Class 3.0 gadget support Documentation/ABI/testing/configfs-usb-gadget-uac3 | 14 + Documentation/usb/gadget-testing.txt | 41 + drivers/usb/gadget/Kconfig | 22 + drivers/usb/gadget/function/Makefile | 2 + drivers/usb/gadget/function/f_uac3.c | 1497 ++++++++++++++++++++ drivers/usb/gadget/function/u_uac3.h | 38 + drivers/usb/gadget/legacy/Kconfig | 3 +- 7 files changed, 1616 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-uac3 create mode 100644 drivers/usb/gadget/function/f_uac3.c create mode 100644 drivers/usb/gadget/function/u_uac3.h -- 1.9.1 -- 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
