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ANDROID: usb: gadget: f_audio_source: New gadget driver for audio output

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This driver presents a standard USB audio class interface to the host
and an ALSA PCM device to userspace

Bug: 78114713
Bug: 120441124
[badhri: f_audio_source is being migrated to userspace.]
Change-Id: If16b14a5ff27045f9cb2daaf1ae9195c5eeab7d0
Signed-off-by: Mike Lockwood <lockwood@google.com>
[AmitP: Folded following android-4.9 commit changes into this patch
        Parts of e275439310 ("ANDROID: usb: gadget: Fixes and hacks to make android usb gadget compile on 3.8")
        i6d9285e2574a ("ANDROID: usb: gadget: f_audio_source:replace deprecated API")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
[astrachan: Folded the following changes into this patch:
            ddfd0c4070c1 ("ANDROID: usb: gadget: f_audio_source: Move to USB_FUNCTION API")
            a3ab81aaa19e ("ANDROID: usb: gadget: f_audio_source: Move gadget functions code")
            2095c953d894 ("ANDROID: usb: gadget: f_audio_source: change max ISO packet size")
            8671b3e53638 ("ANDROID: usb: gadget: f_audio_source: Fixed USB Audio Class Interface Descriptor")
            af98f36edbe2 ("ANDROID: usb: gadget: f_audio_source: disable the CPU C-states upon playback")
            a830751a338e ("CHROMIUM: usb: gadget: f_audio_source: add .free_func callback")]
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Mike Lockwood
2012-05-11 09:01:08 -07:00
committed by Todd Kjos
parent 1f03757257
commit 1983276ceb
3 changed files with 1085 additions and 0 deletions
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12
drivers/usb/gadget/Kconfig
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@@ -218,6 +218,9 @@ config USB_F_TCM
config USB_F_ACC
tristate
config USB_F_AUDIO_SRC
tristate
# this first set of drivers all depend on bulk-capable hardware.
config USB_CONFIGFS
@@ -386,6 +389,15 @@ config USB_CONFIGFS_F_ACC
help
USB gadget Accessory support
config USB_CONFIGFS_F_AUDIO_SRC
bool "Audio Source gadget"
depends on USB_CONFIGFS
depends on SND
select SND_PCM
select USB_F_AUDIO_SRC
help
USB gadget Audio Source support
config USB_CONFIGFS_F_UAC1
bool "Audio Class 1.0"
depends on USB_CONFIGFS

2
drivers/usb/gadget/function/Makefile
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@@ -52,3 +52,5 @@ usb_f_tcm-y := f_tcm.o
obj-$(CONFIG_USB_F_TCM) += usb_f_tcm.o
usb_f_accessory-y := f_accessory.o
obj-$(CONFIG_USB_F_ACC) += usb_f_accessory.o
usb_f_audio_source-y := f_audio_source.o
obj-$(CONFIG_USB_F_AUDIO_SRC) += usb_f_audio_source.o

1071
drivers/usb/gadget/function/f_audio_source.c Normal file
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