[Bluez-devel] snd-bt-sco

Peter Favrholdt
2004-06-30T22:17:22Z

Hi bluez developers,

I'm not sure if this is the right forum. I'm probably in-between alsa-user,
bluez-user, kernel-user? But here goes anyway:-)

I just tried getting the Logitech HS01 bluetooth headset working on kernel
2.6.6 (debian unstable), using the ALSA driver from
http://www.dcs.gla.ac.uk/~jp/snd-bt-sco/

Anyone had success with getting a headset working?

I know this driver is a hack, but it would be cool to have skype working using
a headset under linux.

BR

Peter

--- cut: long and windy story about my adventures ---

I think I managed to patch my kernel-source-2.6.6 successfully. After
modprobing the modules dmesg says:

Bluetooth: L2CAP ver 2.1
Bluetooth: L2CAP socket layer initialized
Bluetooth: RFCOMM ver 1.2
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: SCO (Voice Link) ver 0.3
Bluetooth: SCO socket layer initialized
Bluetooth: HCI USB driver ver 2.5
usbcore: registered new driver hci_usb
snd-bt-sco revision ??$
snd-bt-sco: snd-bt-scod thread starting

so far so good.

After a while I got this additional message:

hci_acldata_packet: hci0 ACL packet for unknown connection handle 1

here is a summary of what I did:

modprobe hci_usb
modprobe sco
invoke-rc.d bluez-utils restart

Here I turned on the headset in this special "reset/pairing mode" (don't know
the right name for it - but you hold down the button for 10 seconds).

hcitool scan
Scanning ...
00:0D:44:00:76:07 Logitech HS01

hcitool cc 00:0D:44:00:76:07 (I think I had to enter pin here)

hciconfig hci0 voice 0x0040

modprobe snd-bt-sco
sdptool search --bdaddr 00:0D:44:00:76:07 0x1108
snd-bt-sco-2004-03-14/btsco-0.2/btsco 00:0D:44:00:76:07 1
Error: control open (hw:0): No such file or directory
Error: Can't find device. Bail

So that was end of the game.

At this time hcitool con says:
Connections:
> ACL 00:0D:44:00:76:07 handle 1 state 1 lm SLAVE

But I've also had it say:
< ACL 00:0D:44:00:76:07 handle 1 state 1 lm MASTER

Using strace I get this:

strace btsco-0.2/btsco 00:0D:44:00:76:07 1

futex(0x400fbffc, FUTEX_WAKE, 2147483647) = 0
access("/etc/asound.conf", R_OK) = -1 ENOENT (No such file or directory)
access("/root/.asoundrc", R_OK) = -1 ENOENT (No such file or directory)
open("/dev/snd/controlC0", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/dev/aloadC0", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/dev/snd/controlC0", O_RDWR) = -1 ENOENT (No such file or directory)
open("/dev/snd/controlC0", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/dev/aloadC0", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/dev/snd/controlC0", O_RDWR) = -1 ENOENT (No such file or directory)
write(2, "Error: ", 7Error: ) = 7
write(2, "control open (hw:0): No such fil"..., 46control open (hw:0): No such
file or directory) = 46
write(2, "\n", 1
) = 1
write(2, "Error: ", 7Error: ) = 7
write(2, "Can\'t find device. Bail", 23Can't find device. Bail) = 23
write(2, "\n", 1
) = 1
exit_group(1) = ?

This could be caused by missing device files in /dev/ maybe?

I have ALSA compiled statically into the kernel, here is what dmesg says:
Advanced Linux Sound Architecture Driver Version 1.0.4rc2 (Tue Mar 30 08:19:30
2004 UTC).
ALSA device list:
#0: C-Media PCI CMI8738 (model 37) at 0xc400, irq 10

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