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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-06-19 00:05:38 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-20 15:28:36 +0300
commitecefae6db042283bf88ef3777f2381b18df8ed46 (patch)
tree5177129d720add73008eeadd6581fab7c27f5233 /Documentation/usb/gadget-testing.rst
parent743344a952fcebee9ca4d783807cf1f03f933baf (diff)
downloadlinux-ecefae6db042283bf88ef3777f2381b18df8ed46.tar.xz
docs: usb: rename files to .rst and add them to drivers-api
While there are a mix of things here, most of the stuff were written from Kernel developer's PoV. So, add them to the driver-api book. A follow up for this patch would be to move documents from there that are specific to sysadmins, adding them to the admin-guide. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Johan Hovold <johan@kernel.org> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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+==============
+Gadget Testing
+==============
+
+This file summarizes information on basic testing of USB functions
+provided by gadgets.
+
+.. contents
+
+ 1. ACM function
+ 2. ECM function
+ 3. ECM subset function
+ 4. EEM function
+ 5. FFS function
+ 6. HID function
+ 7. LOOPBACK function
+ 8. MASS STORAGE function
+ 9. MIDI function
+ 10. NCM function
+ 11. OBEX function
+ 12. PHONET function
+ 13. RNDIS function
+ 14. SERIAL function
+ 15. SOURCESINK function
+ 16. UAC1 function (legacy implementation)
+ 17. UAC2 function
+ 18. UVC function
+ 19. PRINTER function
+ 20. UAC1 function (new API)
+
+
+1. ACM function
+===============
+
+The function is provided by usb_f_acm.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "acm".
+The ACM function provides just one attribute in its function directory:
+
+ port_num
+
+The attribute is read-only.
+
+There can be at most 4 ACM/generic serial/OBEX ports in the system.
+
+
+Testing the ACM function
+------------------------
+
+On the host::
+
+ cat > /dev/ttyACM<X>
+
+On the device::
+
+ cat /dev/ttyGS<Y>
+
+then the other way round
+
+On the device::
+
+ cat > /dev/ttyGS<Y>
+
+On the host::
+
+ cat /dev/ttyACM<X>
+
+2. ECM function
+===============
+
+The function is provided by usb_f_ecm.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "ecm".
+The ECM function provides these attributes in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ qmult queue length multiplier for high and super speed
+ host_addr MAC address of host's end of this
+ Ethernet over USB link
+ dev_addr MAC address of device's end of this
+ Ethernet over USB link
+ =============== ==================================================
+
+and after creating the functions/ecm.<instance name> they contain default
+values: qmult is 5, dev_addr and host_addr are randomly selected.
+Except for ifname they can be written to until the function is linked to a
+configuration. The ifname is read-only and contains the name of the interface
+which was assigned by the net core, e. g. usb0.
+
+Testing the ECM function
+------------------------
+
+Configure IP addresses of the device and the host. Then:
+
+On the device::
+
+ ping <host's IP>
+
+On the host::
+
+ ping <device's IP>
+
+3. ECM subset function
+======================
+
+The function is provided by usb_f_ecm_subset.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "geth".
+The ECM subset function provides these attributes in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ qmult queue length multiplier for high and super speed
+ host_addr MAC address of host's end of this
+ Ethernet over USB link
+ dev_addr MAC address of device's end of this
+ Ethernet over USB link
+ =============== ==================================================
+
+and after creating the functions/ecm.<instance name> they contain default
+values: qmult is 5, dev_addr and host_addr are randomly selected.
+Except for ifname they can be written to until the function is linked to a
+configuration. The ifname is read-only and contains the name of the interface
+which was assigned by the net core, e. g. usb0.
+
+Testing the ECM subset function
+-------------------------------
+
+Configure IP addresses of the device and the host. Then:
+
+On the device::
+
+ ping <host's IP>
+
+On the host::
+
+ ping <device's IP>
+
+4. EEM function
+===============
+
+The function is provided by usb_f_eem.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "eem".
+The EEM function provides these attributes in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ qmult queue length multiplier for high and super speed
+ host_addr MAC address of host's end of this
+ Ethernet over USB link
+ dev_addr MAC address of device's end of this
+ Ethernet over USB link
+ =============== ==================================================
+
+and after creating the functions/eem.<instance name> they contain default
+values: qmult is 5, dev_addr and host_addr are randomly selected.
+Except for ifname they can be written to until the function is linked to a
+configuration. The ifname is read-only and contains the name of the interface
+which was assigned by the net core, e. g. usb0.
+
+Testing the EEM function
+------------------------
+
+Configure IP addresses of the device and the host. Then:
+
+On the device::
+
+ ping <host's IP>
+
+On the host::
+
+ ping <device's IP>
+
+5. FFS function
+===============
+
+The function is provided by usb_f_fs.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "ffs".
+The function directory is intentionally empty and not modifiable.
+
+After creating the directory there is a new instance (a "device") of FunctionFS
+available in the system. Once a "device" is available, the user should follow
+the standard procedure for using FunctionFS (mount it, run the userspace
+process which implements the function proper). The gadget should be enabled
+by writing a suitable string to usb_gadget/<gadget>/UDC.
+
+Testing the FFS function
+------------------------
+
+On the device: start the function's userspace daemon, enable the gadget
+
+On the host: use the USB function provided by the device
+
+6. HID function
+===============
+
+The function is provided by usb_f_hid.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "hid".
+The HID function provides these attributes in its function directory:
+
+ =============== ===========================================
+ protocol HID protocol to use
+ report_desc data to be used in HID reports, except data
+ passed with /dev/hidg<X>
+ report_length HID report length
+ subclass HID subclass to use
+ =============== ===========================================
+
+For a keyboard the protocol and the subclass are 1, the report_length is 8,
+while the report_desc is::
+
+ $ hd my_report_desc
+ 00000000 05 01 09 06 a1 01 05 07 19 e0 29 e7 15 00 25 01 |..........)...%.|
+ 00000010 75 01 95 08 81 02 95 01 75 08 81 03 95 05 75 01 |u.......u.....u.|
+ 00000020 05 08 19 01 29 05 91 02 95 01 75 03 91 03 95 06 |....).....u.....|
+ 00000030 75 08 15 00 25 65 05 07 19 00 29 65 81 00 c0 |u...%e....)e...|
+ 0000003f
+
+Such a sequence of bytes can be stored to the attribute with echo::
+
+ $ echo -ne \\x05\\x01\\x09\\x06\\xa1.....
+
+Testing the HID function
+------------------------
+
+Device:
+
+- create the gadget
+- connect the gadget to a host, preferably not the one used
+ to control the gadget
+- run a program which writes to /dev/hidg<N>, e.g.
+ a userspace program found in Documentation/usb/gadget_hid.rst::
+
+ $ ./hid_gadget_test /dev/hidg0 keyboard
+
+Host:
+
+- observe the keystrokes from the gadget
+
+7. LOOPBACK function
+====================
+
+The function is provided by usb_f_ss_lb.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "Loopback".
+The LOOPBACK function provides these attributes in its function directory:
+
+ =============== =======================
+ qlen depth of loopback queue
+ bulk_buflen buffer length
+ =============== =======================
+
+Testing the LOOPBACK function
+-----------------------------
+
+device: run the gadget
+
+host: test-usb (tools/usb/testusb.c)
+
+8. MASS STORAGE function
+========================
+
+The function is provided by usb_f_mass_storage.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "mass_storage".
+The MASS STORAGE function provides these attributes in its directory:
+files:
+
+ =============== ==============================================
+ stall Set to permit function to halt bulk endpoints.
+ Disabled on some USB devices known not to work
+ correctly. You should set it to true.
+ num_buffers Number of pipeline buffers. Valid numbers
+ are 2..4. Available only if
+ CONFIG_USB_GADGET_DEBUG_FILES is set.
+ =============== ==============================================
+
+and a default lun.0 directory corresponding to SCSI LUN #0.
+
+A new lun can be added with mkdir::
+
+ $ mkdir functions/mass_storage.0/partition.5
+
+Lun numbering does not have to be continuous, except for lun #0 which is
+created by default. A maximum of 8 luns can be specified and they all must be
+named following the <name>.<number> scheme. The numbers can be 0..8.
+Probably a good convention is to name the luns "lun.<number>",
+although it is not mandatory.
+
+In each lun directory there are the following attribute files:
+
+ =============== ==============================================
+ file The path to the backing file for the LUN.
+ Required if LUN is not marked as removable.
+ ro Flag specifying access to the LUN shall be
+ read-only. This is implied if CD-ROM emulation
+ is enabled as well as when it was impossible
+ to open "filename" in R/W mode.
+ removable Flag specifying that LUN shall be indicated as
+ being removable.
+ cdrom Flag specifying that LUN shall be reported as
+ being a CD-ROM.
+ nofua Flag specifying that FUA flag
+ in SCSI WRITE(10,12)
+ =============== ==============================================
+
+Testing the MASS STORAGE function
+---------------------------------
+
+device: connect the gadget, enable it
+host: dmesg, see the USB drives appear (if system configured to automatically
+mount)
+
+9. MIDI function
+================
+
+The function is provided by usb_f_midi.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "midi".
+The MIDI function provides these attributes in its function directory:
+
+ =============== ====================================
+ buflen MIDI buffer length
+ id ID string for the USB MIDI adapter
+ in_ports number of MIDI input ports
+ index index value for the USB MIDI adapter
+ out_ports number of MIDI output ports
+ qlen USB read request queue length
+ =============== ====================================
+
+Testing the MIDI function
+-------------------------
+
+There are two cases: playing a mid from the gadget to
+the host and playing a mid from the host to the gadget.
+
+1) Playing a mid from the gadget to the host:
+
+host::
+
+ $ arecordmidi -l
+ Port Client name Port name
+ 14:0 Midi Through Midi Through Port-0
+ 24:0 MIDI Gadget MIDI Gadget MIDI 1
+ $ arecordmidi -p 24:0 from_gadget.mid
+
+gadget::
+
+ $ aplaymidi -l
+ Port Client name Port name
+ 20:0 f_midi f_midi
+
+ $ aplaymidi -p 20:0 to_host.mid
+
+2) Playing a mid from the host to the gadget
+
+gadget::
+
+ $ arecordmidi -l
+ Port Client name Port name
+ 20:0 f_midi f_midi
+
+ $ arecordmidi -p 20:0 from_host.mid
+
+host::
+
+ $ aplaymidi -l
+ Port Client name Port name
+ 14:0 Midi Through Midi Through Port-0
+ 24:0 MIDI Gadget MIDI Gadget MIDI 1
+
+ $ aplaymidi -p24:0 to_gadget.mid
+
+The from_gadget.mid should sound identical to the to_host.mid.
+
+The from_host.id should sound identical to the to_gadget.mid.
+
+MIDI files can be played to speakers/headphones with e.g. timidity installed::
+
+ $ aplaymidi -l
+ Port Client name Port name
+ 14:0 Midi Through Midi Through Port-0
+ 24:0 MIDI Gadget MIDI Gadget MIDI 1
+ 128:0 TiMidity TiMidity port 0
+ 128:1 TiMidity TiMidity port 1
+ 128:2 TiMidity TiMidity port 2
+ 128:3 TiMidity TiMidity port 3
+
+ $ aplaymidi -p 128:0 file.mid
+
+MIDI ports can be logically connected using the aconnect utility, e.g.::
+
+ $ aconnect 24:0 128:0 # try it on the host
+
+After the gadget's MIDI port is connected to timidity's MIDI port,
+whatever is played at the gadget side with aplaymidi -l is audible
+in host's speakers/headphones.
+
+10. NCM function
+================
+
+The function is provided by usb_f_ncm.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "ncm".
+The NCM function provides these attributes in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ qmult queue length multiplier for high and super speed
+ host_addr MAC address of host's end of this
+ Ethernet over USB link
+ dev_addr MAC address of device's end of this
+ Ethernet over USB link
+ =============== ==================================================
+
+and after creating the functions/ncm.<instance name> they contain default
+values: qmult is 5, dev_addr and host_addr are randomly selected.
+Except for ifname they can be written to until the function is linked to a
+configuration. The ifname is read-only and contains the name of the interface
+which was assigned by the net core, e. g. usb0.
+
+Testing the NCM function
+------------------------
+
+Configure IP addresses of the device and the host. Then:
+
+On the device::
+
+ ping <host's IP>
+
+On the host::
+
+ ping <device's IP>
+
+11. OBEX function
+=================
+
+The function is provided by usb_f_obex.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "obex".
+The OBEX function provides just one attribute in its function directory:
+
+ port_num
+
+The attribute is read-only.
+
+There can be at most 4 ACM/generic serial/OBEX ports in the system.
+
+Testing the OBEX function
+-------------------------
+
+On device::
+
+ seriald -f /dev/ttyGS<Y> -s 1024
+
+On host::
+
+ serialc -v <vendorID> -p <productID> -i<interface#> -a1 -s1024 \
+ -t<out endpoint addr> -r<in endpoint addr>
+
+where seriald and serialc are Felipe's utilities found here:
+
+ https://github.com/felipebalbi/usb-tools.git master
+
+12. PHONET function
+===================
+
+The function is provided by usb_f_phonet.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "phonet".
+The PHONET function provides just one attribute in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ =============== ==================================================
+
+Testing the PHONET function
+---------------------------
+
+It is not possible to test the SOCK_STREAM protocol without a specific piece
+of hardware, so only SOCK_DGRAM has been tested. For the latter to work,
+in the past I had to apply the patch mentioned here:
+
+http://www.spinics.net/lists/linux-usb/msg85689.html
+
+These tools are required:
+
+git://git.gitorious.org/meego-cellular/phonet-utils.git
+
+On the host::
+
+ $ ./phonet -a 0x10 -i usbpn0
+ $ ./pnroute add 0x6c usbpn0
+ $./pnroute add 0x10 usbpn0
+ $ ifconfig usbpn0 up
+
+On the device::
+
+ $ ./phonet -a 0x6c -i upnlink0
+ $ ./pnroute add 0x10 upnlink0
+ $ ifconfig upnlink0 up
+
+Then a test program can be used::
+
+ http://www.spinics.net/lists/linux-usb/msg85690.html
+
+On the device::
+
+ $ ./pnxmit -a 0x6c -r
+
+On the host::
+
+ $ ./pnxmit -a 0x10 -s 0x6c
+
+As a result some data should be sent from host to device.
+Then the other way round:
+
+On the host::
+
+ $ ./pnxmit -a 0x10 -r
+
+On the device::
+
+ $ ./pnxmit -a 0x6c -s 0x10
+
+13. RNDIS function
+==================
+
+The function is provided by usb_f_rndis.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "rndis".
+The RNDIS function provides these attributes in its function directory:
+
+ =============== ==================================================
+ ifname network device interface name associated with this
+ function instance
+ qmult queue length multiplier for high and super speed
+ host_addr MAC address of host's end of this
+ Ethernet over USB link
+ dev_addr MAC address of device's end of this
+ Ethernet over USB link
+ =============== ==================================================
+
+and after creating the functions/rndis.<instance name> they contain default
+values: qmult is 5, dev_addr and host_addr are randomly selected.
+Except for ifname they can be written to until the function is linked to a
+configuration. The ifname is read-only and contains the name of the interface
+which was assigned by the net core, e. g. usb0.
+
+Testing the RNDIS function
+--------------------------
+
+Configure IP addresses of the device and the host. Then:
+
+On the device::
+
+ ping <host's IP>
+
+On the host::
+
+ ping <device's IP>
+
+14. SERIAL function
+===================
+
+The function is provided by usb_f_gser.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "gser".
+The SERIAL function provides just one attribute in its function directory:
+
+ port_num
+
+The attribute is read-only.
+
+There can be at most 4 ACM/generic serial/OBEX ports in the system.
+
+Testing the SERIAL function
+---------------------------
+
+On host::
+
+ insmod usbserial
+ echo VID PID >/sys/bus/usb-serial/drivers/generic/new_id
+
+On host::
+
+ cat > /dev/ttyUSB<X>
+
+On target::
+
+ cat /dev/ttyGS<Y>
+
+then the other way round
+
+On target::
+
+ cat > /dev/ttyGS<Y>
+
+On host::
+
+ cat /dev/ttyUSB<X>
+
+15. SOURCESINK function
+=======================
+
+The function is provided by usb_f_ss_lb.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "SourceSink".
+The SOURCESINK function provides these attributes in its function directory:
+
+ =============== ==================================
+ pattern 0 (all zeros), 1 (mod63), 2 (none)
+ isoc_interval 1..16
+ isoc_maxpacket 0 - 1023 (fs), 0 - 1024 (hs/ss)
+ isoc_mult 0..2 (hs/ss only)
+ isoc_maxburst 0..15 (ss only)
+ bulk_buflen buffer length
+ bulk_qlen depth of queue for bulk
+ iso_qlen depth of queue for iso
+ =============== ==================================
+
+Testing the SOURCESINK function
+-------------------------------
+
+device: run the gadget
+
+host: test-usb (tools/usb/testusb.c)
+
+
+16. UAC1 function (legacy implementation)
+=========================================
+
+The function is provided by usb_f_uac1_legacy.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory
+is "uac1_legacy".
+The uac1 function provides these attributes in its function directory:
+
+ =============== ====================================
+ audio_buf_size audio buffer size
+ fn_cap capture pcm device file name
+ fn_cntl control device file name
+ fn_play playback pcm device file name
+ req_buf_size ISO OUT endpoint request buffer size
+ req_count ISO OUT endpoint request count
+ =============== ====================================
+
+The attributes have sane default values.
+
+Testing the UAC1 function
+-------------------------
+
+device: run the gadget
+
+host::
+
+ aplay -l # should list our USB Audio Gadget
+
+17. UAC2 function
+=================
+
+The function is provided by usb_f_uac2.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "uac2".
+The uac2 function provides these attributes in its function directory:
+
+ =============== ====================================================
+ c_chmask capture channel mask
+ c_srate capture sampling rate
+ c_ssize capture sample size (bytes)
+ p_chmask playback channel mask
+ p_srate playback sampling rate
+ p_ssize playback sample size (bytes)
+ req_number the number of pre-allocated request for both capture
+ and playback
+ =============== ====================================================
+
+The attributes have sane default values.
+
+Testing the UAC2 function
+-------------------------
+
+device: run the gadget
+host: aplay -l # should list our USB Audio Gadget
+
+This function does not require real hardware support, it just
+sends a stream of audio data to/from the host. In order to
+actually hear something at the device side, a command similar
+to this must be used at the device side::
+
+ $ arecord -f dat -t wav -D hw:2,0 | aplay -D hw:0,0 &
+
+e.g.::
+
+ $ arecord -f dat -t wav -D hw:CARD=UAC2Gadget,DEV=0 | \
+ aplay -D default:CARD=OdroidU3
+
+18. UVC function
+================
+
+The function is provided by usb_f_uvc.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "uvc".
+The uvc function provides these attributes in its function directory:
+
+ =================== ================================================
+ streaming_interval interval for polling endpoint for data transfers
+ streaming_maxburst bMaxBurst for super speed companion descriptor
+ streaming_maxpacket maximum packet size this endpoint is capable of
+ sending or receiving when this configuration is
+ selected
+ =================== ================================================
+
+There are also "control" and "streaming" subdirectories, each of which contain
+a number of their subdirectories. There are some sane defaults provided, but
+the user must provide the following:
+
+ ================== ====================================================
+ control header create in control/header, link from control/class/fs
+ and/or control/class/ss
+ streaming header create in streaming/header, link from
+ streaming/class/fs and/or streaming/class/hs and/or
+ streaming/class/ss
+ format description create in streaming/mjpeg and/or
+ streaming/uncompressed
+ frame description create in streaming/mjpeg/<format> and/or in
+ streaming/uncompressed/<format>
+ ================== ====================================================
+
+Each frame description contains frame interval specification, and each
+such specification consists of a number of lines with an inverval value
+in each line. The rules stated above are best illustrated with an example::
+
+ # mkdir functions/uvc.usb0/control/header/h
+ # cd functions/uvc.usb0/control/
+ # ln -s header/h class/fs
+ # ln -s header/h class/ss
+ # mkdir -p functions/uvc.usb0/streaming/uncompressed/u/360p
+ # cat <<EOF > functions/uvc.usb0/streaming/uncompressed/u/360p/dwFrameInterval
+ 666666
+ 1000000
+ 5000000
+ EOF
+ # cd $GADGET_CONFIGFS_ROOT
+ # mkdir functions/uvc.usb0/streaming/header/h
+ # cd functions/uvc.usb0/streaming/header/h
+ # ln -s ../../uncompressed/u
+ # cd ../../class/fs
+ # ln -s ../../header/h
+ # cd ../../class/hs
+ # ln -s ../../header/h
+ # cd ../../class/ss
+ # ln -s ../../header/h
+
+
+Testing the UVC function
+------------------------
+
+device: run the gadget, modprobe vivid::
+
+ # uvc-gadget -u /dev/video<uvc video node #> -v /dev/video<vivid video node #>
+
+where uvc-gadget is this program:
+ http://git.ideasonboard.org/uvc-gadget.git
+
+with these patches:
+
+ http://www.spinics.net/lists/linux-usb/msg99220.html
+
+host::
+
+ luvcview -f yuv
+
+19. PRINTER function
+====================
+
+The function is provided by usb_f_printer.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "printer".
+The printer function provides these attributes in its function directory:
+
+ ========== ===========================================
+ pnp_string Data to be passed to the host in pnp string
+ q_len Number of requests per endpoint
+ ========== ===========================================
+
+Testing the PRINTER function
+----------------------------
+
+The most basic testing:
+
+device: run the gadget::
+
+ # ls -l /devices/virtual/usb_printer_gadget/
+
+should show g_printer<number>.
+
+If udev is active, then /dev/g_printer<number> should appear automatically.
+
+host:
+
+If udev is active, then e.g. /dev/usb/lp0 should appear.
+
+host->device transmission:
+
+device::
+
+ # cat /dev/g_printer<number>
+
+host::
+
+ # cat > /dev/usb/lp0
+
+device->host transmission::
+
+ # cat > /dev/g_printer<number>
+
+host::
+
+ # cat /dev/usb/lp0
+
+More advanced testing can be done with the prn_example
+described in Documentation/usb/gadget_printer.rst.
+
+
+20. UAC1 function (virtual ALSA card, using u_audio API)
+========================================================
+
+The function is provided by usb_f_uac1.ko module.
+It will create a virtual ALSA card and the audio streams are simply
+sinked to and sourced from it.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "uac1".
+The uac1 function provides these attributes in its function directory:
+
+ ========== ====================================================
+ c_chmask capture channel mask
+ c_srate capture sampling rate
+ c_ssize capture sample size (bytes)
+ p_chmask playback channel mask
+ p_srate playback sampling rate
+ p_ssize playback sample size (bytes)
+ req_number the number of pre-allocated request for both capture
+ and playback
+ ========== ====================================================
+
+The attributes have sane default values.
+
+Testing the UAC1 function
+-------------------------
+
+device: run the gadget
+host: aplay -l # should list our USB Audio Gadget
+
+This function does not require real hardware support, it just
+sends a stream of audio data to/from the host. In order to
+actually hear something at the device side, a command similar
+to this must be used at the device side::
+
+ $ arecord -f dat -t wav -D hw:2,0 | aplay -D hw:0,0 &
+
+e.g.::
+
+ $ arecord -f dat -t wav -D hw:CARD=UAC1Gadget,DEV=0 | \
+ aplay -D default:CARD=OdroidU3