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-
