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

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