USB: gadget: add USB Audio Gadget driver

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

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 9be2fbd6f5c2..fc9a7dc01047 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_USB_S3C_HSOTG)	+= s3c-hsotg.o
 # USB gadget drivers
 #
 g_zero-objs                     := zero.o
+g_audio-objs                    := audio.o
 g_ether-objs                    := ether.o
 g_serial-objs                   := serial.o
 g_midi-objs                     := gmidi.o
@@ -40,6 +41,7 @@ g_printer-objs			:= printer.o
 g_cdc-objs                      := cdc2.o
 
 obj-$(CONFIG_USB_ZERO)          += g_zero.o
+obj-$(CONFIG_USB_AUDIO)         += g_audio.o
 obj-$(CONFIG_USB_ETH)           += g_ether.o
 obj-$(CONFIG_USB_GADGETFS)      += gadgetfs.o
 obj-$(CONFIG_USB_FILE_STORAGE)  += g_file_storage.o