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From: Doug Kingston <dpk@randomnotes.org>
To: linux-usb@vger.kernel.org
Cc: gregkh@linuxfoundation.org
Subject: USB Sound Device detection problem
Date: Tue, 19 Jan 2021 10:20:34 -0800	[thread overview]
Message-ID: <CAGPaoUucowcpa5k_9VVjnRnrUkiG=npiCJYaOyT6-Ya7hEfJKg@mail.gmail.com> (raw)

I am doing some work setting up some radio data nodes that use USB
soundcard devices to attach to radios.  I am building a system with
two radios and two identical soundcard devices attached to a Raspberry
Pi running Raspbian.  The devices are discovered at boot time by the
hid-generic subsystem:

(see dmesg output below)

I am accessing the sound devices from Wine via the ALSA stack.  The
problem I have is that
the product string is identical for both devices and they show up
identically to the Windows app ("USB PnP Sound Device").  I need to
find a way to alter this string so that they are different.  If they
were processed by udev I might be able to do something there.

The options seem to be:
1) fix at kernel usb discovery
2) somehow fix in the ALSA library (snd_*)
3) fix in Wine (mmsys.drv / winealsa.drv/mmdevdrv.c
4) somewhere else?

And, we need to do this in a supportable fashion that does not break
existing users of this subsystem.

Do you have any suggestions?

Regards,
  -Doug-


winlink@acs-vara-cappark:~$ lsusb
Bus 004 Device 002: ID 8087:8000 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 8087:8008 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0d8c:013a C-Media Electronics, Inc.
Bus 001 Device 002: ID 0403:6015 Future Technology Devices
International, Ltd Bridge(I2C/SPI/UART/FIFO)
Bus 001 Device 004: ID 0d8c:013a C-Media Electronics, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

winlink@acs-vara-cappark:~$ amixer -c 2 info
Card hw:2 'Device'/'C-Media Electronics Inc. USB PnP Sound Device at
usb-0000:00:14.0-9, full speed'
  Mixer name : 'USB Mixer'
  Components : 'USB0d8c:013a'
  Controls      : 10
  Simple ctrls  : 3
winlink@acs-vara-cappark:~$ amixer -c 3 info
Card hw:3 'Device_1'/'C-Media Electronics Inc. USB PnP Sound Device at
usb-0000:00:14.0-10, full spee'
  Mixer name : 'USB Mixer'
  Components : 'USB0d8c:013a'
  Controls      : 10
  Simple ctrls  : 3
winlink@acs-vara-cappark:~$

dmesg output:

[    1.743798] usb 3-1: New USB device found, idVendor=8087,
idProduct=8008, bcdDevice= 0.04
[    1.743799] usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.743935] hub 3-1:1.0: USB hub found
[    1.744047] hub 3-1:1.0: 6 ports detected
[    1.759796] usb 4-1: New USB device found, idVendor=8087,
idProduct=8000, bcdDevice= 0.04
[    1.759799] usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.759921] hub 4-1:1.0: USB hub found
[    1.760055] hub 4-1:1.0: 8 ports detected
[    1.831425] usb 1-9: new full-speed USB device number 3 using xhci_hcd
[    2.020574] usb 1-9: New USB device found, idVendor=0d8c,
idProduct=013a, bcdDevice= 1.00
[    2.020576] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    2.020577] usb 1-9: Product: USB PnP Sound Device
[    2.020577] usb 1-9: Manufacturer: C-Media Electronics Inc.
[    2.025323] hidraw: raw HID events driver (C) Jiri Kosina
[    2.027693] usbcore: registered new interface driver usbhid
[    2.027694] usbhid: USB HID core driver
[    2.028580] input: C-Media Electronics Inc.       USB PnP Sound
Device as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.3/0003:0D8C:013A.0001/input/input3
[    2.087471] hid-generic 0003:0D8C:013A.0001: input,hidraw0: USB HID
v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on
usb-0000:00:14.0-9/input3
[    2.171437] usb 1-10: new full-speed USB device number 4 using xhci_hcd
[    2.288774] EXT4-fs (dm-0): mounted filesystem with ordered data
mode. Opts: (null)
[    2.299437] [drm] Cannot find any crtc or sizes
[    2.364637] usb 1-10: New USB device found, idVendor=0d8c,
idProduct=013a, bcdDevice= 1.00
[    2.364639] usb 1-10: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[    2.364641] usb 1-10: Product: USB PnP Sound Device
[    2.364641] usb 1-10: Manufacturer: C-Media Electronics Inc.
[    2.365761] input: C-Media Electronics Inc.       USB PnP Sound
Device as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.3/0003:0D8C:013A.0002/input/input4
[    2.423454] hid-generic 0003:0D8C:013A.0002: input,hidraw1: USB HID
v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on
usb-0000:00:14.0-10/input3

-Doug-

             reply	other threads:[~2021-01-19 18:30 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-19 18:20 Doug Kingston [this message]
2021-01-19 18:34 ` USB Sound Device detection problem Greg KH
2021-01-19 19:40 ` Alan Stern

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