Re: CM6206 USB Audio is mute.

2015-04-22 9:40 GMT+02:00 Hans Petter Selasky <hps_at_selasky.org>:

> On 04/21/15 21:30, Ranjan1018 . wrote:
>
>> Connecting the USB cable the item is recognized:
>> ugen0.5: <vendor 0x0d8c> at usbus0
>> uaudio0: <vendor 0x0d8c USB Sound Device, class 0/0, rev 1.10/0.10, addr
>> 5>
>> on usbus0
>> uaudio0: Play: 48000 Hz, 4 ch, 16-bit S-LE PCM format, 2x8ms buffer.
>> uaudio0: Play: 44100 Hz, 4 ch, 16-bit S-LE PCM format, 2x8ms buffer.
>> uaudio0: Record: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
>> uaudio0: Record: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
>> uaudio0: No MIDI sequencer.
>> pcm1: <USB audio> on uaudio0
>> uaudio0: HID volume keys found.
>>
>>
> Hi,
>
> Did you check:
>
> mixer -f /dev/mixerX
>
> that sound volume is OK?
>
>  Setting it as default unit
>> # sysctl  hw.snd.default_unit=1
>> and playing a song the interrupts count increase:
>>
>
> Some volume knobs might be hidden. Try to get all:
>
> sysctl -a | grep pcm
>
>
>  But the output is mute.
>>
>> In Debian Linux it works:
>> # lsusb
>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>> Bus 002 Device 014: ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like
>> Sound
>> Device
>> # aplay -l
>> **** List of PLAYBACK Hardware Devices ****
>> card 1: Device [USB Sound Device], device 0: USB Audio [USB Audio]
>>   Subdevices: 0/1
>>   Subdevice #0: subdevice #0
>>
>> Looking at http://lxr.free-electrons.com/source/sound/usb/quirks.c I have
>> found this code:
>> /*
>> 632 * C-Media CM106/CM106+ have four 16-bit internal registers that are
>> nicely
>> 633 * documented in the device's data sheet.
>> 634 */
>> 635 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int
>> reg,
>> u16 value)
>> 636 {
>> 637         u8 buf[4];
>> 638         buf[0] = 0x20;
>> 639         buf[1] = value & 0xff;
>> 640         buf[2] = (value >> 8) & 0xff;
>> 641         buf[3] = reg;
>> 642         return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
>> USB_REQ_SET_CONFIGURATION,
>> 643                                USB_DIR_OUT | USB_TYPE_CLASS |
>> USB_RECIP_ENDPOINT,
>> 644                                0, 0, &buf, 4);
>> 645 }
>>
>
> This USB control request can be issued from userspace like this (you need
> to convert all variables below into constants):
>
> usbconfig -d X.Y do_request "USB_DIR_OUT | USB_TYPE_CLASS |
> > USB_RECIP_ENDPOINT" "USB_REQ_SET_CONFIGURATION" 0 0 4 0x20 "(value &
> 0xff)" "(value >> 8) & 0xff" "reg"
>
> Such a command can easily be added like a devd script to run automatically
> during device attach.
>
>
>  646
>>   647 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
>> 648 {
>> 649         /*
>> 650         * Enable line-out driver mode, set headphone source to front
>> 651         * channels, enable stereo mic.
>> 652         */
>> 653         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
>> 654 }
>> 655
>>   656 /*
>> 657 * C-Media CM6206 is based on CM106 with two additional
>> 658 * registers that are not documented in the data sheet.
>> 659 * Values here are chosen based on sniffing USB traffic
>> 660 * under Windows.
>> 661 */
>> 662 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
>> 663 {
>> 664         int err  = 0, reg;
>> 665         int val[] = {0x2004, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
>> 666
>>   667         for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
>> 668                 err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
>> 669                 if (err < 0)
>> 670                         return err;
>> 671         }
>> 672
>>   673         return err;
>> 674 }
>> 675
>>
>> How can I test this code in FreeBSD ?
>>
>>
> See answer above.
>
> Please also use -stable or -current when testing.
>
> --HPS
>
>
Thank you Hans, it works !!!
This is only the first step in supporting the C-Media CM6206 in FreeBSD,
but works.

I have converted the C code in a bash script: snd-cm6206.sh  available at
http://pastebin.com/dLtJAqE7
Instructions:
- Connect the USB cable of the CM6206
- With the command
  # dmesg | tail
  look at the the line : ugenX.Y: <vendor 0x0d8c> at usbus
  and the line : pcmZ: <USB audio> on uaudio
- Run the script:  # snd-cm6206.sh X.Y
- Run the command: # sysctl hw.snd.default_unit=Z
- Reduce the volume ;-) : # mixer -f /dev/mixerZ 10

On my laptop running 11-CURRENT, after connecting the CM6206, I have :
# dmesg | tail
pcm3: detached
ugen1.4: <vendor 0x0d8c> at usbus1
uaudio0: <vendor 0x0d8c USB Sound Device, class 0/0, rev 1.10/0.10, addr 4>
on usbus1
uaudio0: Play: 48000 Hz, 4 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Play: 44100 Hz, 4 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Record: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: Record: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer.
uaudio0: No MIDI sequencer.
pcm3: <USB audio> on uaudio0
uaudio0: HID volume keys found.

# snd-cm6206.sh 1.4
Writing register 0
REQUEST = <OK>
Writing register 1
REQUEST = <OK>
Writing register 2
REQUEST = <OK>
Writing register 3
REQUEST = <OK>
Writing register 4
REQUEST = <OK>
Writing register 5
REQUEST = <OK>

# sysctl hw.snd.default_unit=3
hw.snd.default_unit: 0 -> 3

# mixer -f /dev/mixer3 10
Setting the mixer vol from 75:75 to 10:10.

Regards,
Maurizio