Re: USB testing : No test device recognized.

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On 4 June 2012 11:27, ABRAHAM, KISHON VIJAY <kishon@xxxxxx> wrote:
> Hi,
>
> On Mon, Jun 4, 2012 at 7:52 AM, Haris Ibrahim K. V. <blucalvin@xxxxxxxxx> wrote:
>> Hi all,
>>
>> I have my host system (Ubuntu 10.04) connected to my Beagle Board XM
>> running Angstrom distro.
>>
>> I have a cross over ethernet connection for 'ssh'ing purposes and a
>> USB OTG cable connection as well.
>>
>> I loaded a usb gadget driver on my beagle board called g_audio.ko. The
>> host side demsg command showed:
>>
>> [  703.460202] usb 1-2: new high speed USB device using ehci_hcd and address 4
>> [  703.593970] usb 1-2: configuration #1 chosen from 1 choice
>> [  703.743828] usbcore: registered new interface driver snd-usb-audio
>>
>> On the beagle board 'dmesg' showed:
>>
>> [  153.068389] g_audio gadget: Hardware params: access 3, format 2,
>> channels 2, rate 48000
>> [  153.082489] g_audio gadget: audio_buf_size 48000, req_buf_size 200,
>> req_count 256
>> [  153.095855] g_audio gadget: Linux USB Audio Gadget, version: Dec 18, 2008
>> [  153.108581] g_audio gadget: g_audio ready
>> [  153.118347] musb-hdrc musb-hdrc: MUSB HDRC host driver
>> [  153.129821] musb-hdrc musb-hdrc: new USB bus registered, assigned
>> bus number 2
>> [  153.143249] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
>> [  153.156250] usb usb2: New USB device strings: Mfr=3, Product=2,
>> SerialNumber=1
>> [  153.169403] usb usb2: Product: MUSB HDRC host driver
>> [  153.180023] usb usb2: Manufacturer: Linux 3.0.29+ musb-hcd
>> [  153.191162] usb usb2: SerialNumber: musb-hdrc
>> [  153.201812] hub 2-0:1.0: USB hub found
>> [  153.211090] hub 2-0:1.0: 1 port detected
>> [  153.645568] g_audio gadget: high speed config #1: Linux USB Audio Gadget
>>
>> I hope that means both the systems have recognized the existence of that driver.
>>
>> I wanted to test if the connection was fine. Searching for a way, I
>> found this link: linux-usb<dot>org/usbtest/
>>
>> I downloaded both the testusb.c and test.sh files from there. Upon
>> compiling and running testusb, it showed:
>>
>> usbfs files are missing
>>
>> I compiled a new kernel with "Device Drivers->USB support" as option
>> "USB device filesystem" enabled. But that only brought me till
>> /proc/bus/usb/ . The 'devices' inside that was still not there.
>>
>> After searching I did:
>>
>> sudo ln -s /sys/kernel/debug/usb/devices /proc/bus/usb/devices
>>
>> Now I again ran ./testusb -a and got the output:
>>
>> no test devices recognized
>
> g_audio is not a test device. You can perform the same test with
> g_zero. You can have a look at testusb.c to check what all is
> recognized as test device. You'll see gadget zero as a test device :-)
>
>        /* "gadget zero", Linux-USB test software */
>        if (dev->idVendor == 0x0525 && dev->idProduct == 0xa4a0)
>                return 1;
>>
>> Why hasn't my gadget driver been recognized by this program? Is there
>> a work around where I can check whether my beagle board has been
>> detected via the USB OTG cable?
>
> Yes. You can use *lsusb* in your host pc to see the list of attached
> devices. You'll find something like *gadget audio* if you had g_audio
> or *gadget zero* if you have g_zero.
>
> Regards
> Kishon

Thank you. :)

When I loaded the gadget driver on my board, running lsusb on the host
showed me the following output:

Bus 001 Device 018: ID 1d6b:0101 Linux Foundation Audio Gadget

However, I also saw that a new entry 'audio1' had appeared under /dev/
. Is there a way to confirm that that corresponds to the gadget driver
loaded on the board?

Also, when I loaded the g_audio in the board, 'usbmon2' popped up
under /dev. So if both audio1 (on the host) and usbmon2 (on the board)
were the interfaces to the g_audio gadget driver, won't I be able to
write something to "usbmon2" and read that data from "audio1"?

-- 
Haris Ibrahim K. V.
sosaysharis.wordpress.com
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