mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:50:53 +07:00
f811a38300
testusb.c at http://www.linux-usb.org/usbtest/ is out of date, using the one at the kernel source folder. Cc: <stable@vger.kernel.org> Signed-off-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
771 lines
22 KiB
Plaintext
771 lines
22 KiB
Plaintext
This file summarizes information on basic testing of USB functions
|
|
provided by gadgets.
|
|
|
|
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
|
|
17. UAC2 function
|
|
18. UVC function
|
|
19. PRINTER function
|
|
|
|
|
|
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.txt:
|
|
|
|
$ ./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://git.gitorious.org/usb/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
|
|
|
|
Testing the SOURCESINK function
|
|
-------------------------------
|
|
|
|
device: run the gadget
|
|
host: test-usb (tools/usb/testusb.c)
|
|
|
|
|
|
16. UAC1 function
|
|
=================
|
|
|
|
The function is provided by usb_f_uac1.ko module.
|
|
|
|
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:
|
|
|
|
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)
|
|
|
|
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/header/h
|
|
# 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.txt.
|