6 Jun
2005
6 Jun
'05
8:08 p.m.
Hi all.
I am trying to control the settings of my EgoSys U2A
sound card by sending it the same commands that I can
see being sent to it when I am using the Windows U2A
control panel.
I naively thought that I could use libusb, but I
cannot open interfaces on the sound card, because
snd_usb_audio is using the device. Unloading
snd_usb_audio releases the audio interface so I can
claim it with libusb calls but that is hardly
practical for changing settings occasionally.
Are there any standard ioctl() calls in the
snd_usb_audio driver that allows me to send messages
to a USB interface, or any other way of doing this the
civilized way - that is: through the driver ? Any
pointers greatly appreciated.
Cheers
-- Jan Holst Jensen, Denmark
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7 Jun
7 Jun
6:01 p.m.
Use the Source, Luke!
As far as I seen (not far, really), it does not allow to send custom
messages. But nobody stops you from extending the driver a bit ;)
8 Jun
8 Jun
8:40 p.m.
Use the Source, Luke!
As far as I seen (not far, really), it does not
allow to send custom
messages. But nobody stops you from extending the
driver a bit ;)
Ugh! I was hoping to avoid programming in kernel mode.
Contrary to some, I prefer to stay away from the dark
side :-). And a more genuine concern is deployment of
the application - I would hate to have to require a
driver update to do this.
Cheers
-- Jan
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5:43 a.m.
Jan Holst Jensen wrote:
I am trying to control the settings of my EgoSys U2A
sound card by sending it the same commands that I can
see being sent to it when I am using the Windows U2A
control panel.
What kind of messages are these?
Are there any standard ioctl() calls in the
snd_usb_audio driver that allows me to send messages
to a USB interface,
No, but this would be a very good idea for testing purposes. I'll add
a hwdep device for this.
Regards,
Clemens
8:47 p.m.
--- Clemens Ladisch <clemens(a)ladisch.de> wrote:
The USB snooper lists them all as CONTROL_TRANSFER.
Great. Looking forward to that. But until then, my
best shot is hacking the driver I guess... ?
Any idea what happens in Windows ? Doesn't seem like
the device is locked by the driver in that OS (?).
Cheers
-- Jan
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sound card by
sending it the same commands that I
What kind of messages are these? Are there any
standard ioctl() calls in the
No, but this would be a very good idea for testing
purposes. I'll add a hwdep device for this.
9 Jun
9 Jun
6:33 a.m.
Jan Holst Jensen wrote:
--- Clemens Ladisch <clemens(a)ladisch.de> wrote:
Great. Looking forward to that. But until then, my
best shot is hacking the driver I guess... ?
This _is_ hacking the driver. :-)
Are there
any standard ioctl() calls in the
No, but this would be a very good idea for testing
purposes. I'll add a hwdep device for this. Any idea what happens in Windows ? Doesn't seem
like
the device is locked by the driver in that OS (?).
It is, but usually the driver provides ioctls to allow applications to
change some settings.
The patch adds an hwdep device that provides a USBDEVFS_CONTROL ioctl
that should work identical to that from <linux/usbdevice_fs.h>, except
that you need root privileges to use it.
The patch is against the CVS version of ALSA. Both the driver and
alsa-lib need to be recompiled.
To access the device, use snd_hwdep_open() and snd_hwdep_ioctl(). The
device name is "hw:X,1" where X is the card number.
HTH
Clemens
12 Jun
12 Jun
8:47 a.m.
This _is_ hacking the driver. :-)
No doubt about that :-).
Any idea what
happens in Windows ? Doesn't seem
like
the device is locked by the driver in that OS
(?).
It is, but usually the driver provides ioctls to
allow applications to change some settings. The patch adds an hwdep device that provides a
USBDEVFS_CONTROL ioctl
Thanks Clemens. I'll see if I can get through the
compilation.
Cheers
-- Jan
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10:49 a.m.
New subject: [linux-audio-dev] Compiling ALSA. Was: Sending USB msgs to sound card...
> The patch adds an hwdep device that provides a
> USBDEVFS_CONTROL ioctl
Hmmm... I have checked out alsa via anonymous CVS from
sourceforge. Can't get it to compile - it misses a
./configure script when running "./build config". What
did I do wrong ? How-tos do not seem very helpful as
they are apparently out-of-date (they just mention
doing the standard ./configure, make, etc.
routine...).
Tried instead do a "./build prep" as that might be a
logical first thing to do, but now it complains that
aclocal cannot be found. Is that autoconf ? I do have
autoconf, latest version according to apt-get (running
Debian Sarge).
Cheers
-- Jan
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11:52 a.m.
New subject: [linux-audio-dev] Compiling ALSA. Was: Sending USB msgs to sound card...
Jan Holst Jensen wrote:
Hmmm... I have checked out alsa via anonymous CVS
from
sourceforge. Can't get it to compile - it misses a
./configure script when running "./build config".
Run the cvscompile script, or see the INSTALL file.
The patch should work with the 1.0.9b release, too.
HTH
Clemens
7:42 p.m.
New subject: [linux-audio-dev] Compiling ALSA. Was: Sending USB msgs to sound card...
sourceforge.
Can't get it to compile - it misses a
./configure script when running "./build config".
Run the cvscompile script, or see the INSTALL file.
The patch should work with the 1.0.9b release, too.
7139
days inactive
7145
days old
linux-audio-dev@lists.linuxaudio.org
9 comments
3 participants
participants (3)
-
Clemens Ladisch -
Dmitry Baikov -
Jan Holst Jensen