At Tue, 13 Feb 2007 21:01:35 +0000,
Rui Nuno Capela wrote:
>
> Karsten Wiese wrote:
> >> How about using snd_pcm_hw_params_get_channels_max() ?
> >> At least on capture the US224 should give 2 and the US428 should give 4
> >> as the maximum number of channels.
> >>
> >> It would be handful for me if the attached test program could be ran
> >> against a US428, just for the records ;)
> >>
> >> On my US224 it gives:
> >>
> >> $ snd_hwdep_info hw:3
> >> ---hwdep---
> >> snd_hwdep_info_get_id (hw:3) = 'USX2Y Loader'
> >> snd_hwdep_info_get_name (hw:3) = '/proc/bus/usb/001/004'
> >> ---pcm (capture)---
> >> snd_pcm_hw_params_get_channels_min(hw:3) = 2
> >> snd_pcm_hw_params_get_channels_max(hw:3) = 2
> >> ---pcm (playback)---
> >> snd_pcm_hw_params_get_channels_min(hw:3) = 2
> >> snd_pcm_hw_params_get_channels_max(hw:3) = 2
> >>
> >> Karsten?
> >
> > ./a.out hw:1
> > ---hwdep---
> > snd_hwdep_info_get_id (hw:1) = 'USX2Y Loader'
> > snd_hwdep_info_get_name (hw:1) = '/proc/bus/usb/004/007'
> > ---pcm (capture)---
> > snd_pcm_hw_params_get_channels_min(hw:1) = 2
> > snd_pcm_hw_params_get_channels_max(hw:1) = 2
> > ---pcm (playback)---
> > snd_pcm_hw_params_get_channels_min(hw:1) = 2
> > snd_pcm_hw_params_get_channels_max(hw:1) = 2
> >
> > The 428's 4 capture channels are only visible to the raw-usb jack thing.
> > and this is only there for module param nrpacks=1.....
> >
> > What do you see in your /sys/bus/usb/devices/... ?
> > (Not that I knew how to deduce the sysfs file from the hwdep->name)
> >
>
> We're in trouble... there must be another way. What about the shm
> accessed from us428control? Is there supposed to be some watermark or
> something? Maybe even the number of fader-channels, who knoes? I'm
> afraid only you Karsten can grok that ;)
The easiest way would be to add a new hwdep ioctl in usx2y driver to
return the USB ids, etc. Also, hardcoding the path /proc/xxx is wrong
in the current driver code. It has to be fixed, too.
You can still add an option to us248control to specify the device type
for making it work with the old driver.
Another way is to use libusb and look for the device with the given
location. The merit of this is that you need no change in the kernel
although the resultant code might be slightly more complicated.
BTW, the new systems have usually /dev/bus/usb instead of
/proc/bus/usb. But such path is really system-dependent, and
shouldn't be embedded in the driver code.
Takashi
>
>
> Anyway, here what I could grab, anyway:
>
> # ls -l /sys/bus/usb/drivers/snd-usb-usx2y/
> total 0
> lrwxrwxrwx 1 root root 0 Feb 13 20:45 1-1:1.0 ->
> ../../../../devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1:1.0
> --w------- 1 root root 4096 Feb 13 20:45 bind
> lrwxrwxrwx 1 root root 0 Feb 13 20:45 module ->
> ../../../../module/snd_usb_usx2y
> --w------- 1 root root 4096 Feb 13 20:45 new_id
> --w------- 1 root root 4096 Feb 13 20:45 unbind
>
> # ls -l /sys/bus/usb/devices/1-1/
> total 0
> drwxr-xr-x 3 root root 0 Feb 13 20:50 1-1:1.0
> -rw-r--r-- 1 root root 4096 Feb 13 20:39 bConfigurationValue
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bDeviceClass
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bDeviceProtocol
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bDeviceSubClass
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bMaxPacketSize0
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bMaxPower
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bNumConfigurations
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bNumInterfaces
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bcdDevice
> -r--r--r-- 1 root root 4096 Feb 13 20:39 bmAttributes
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 bus -> ../../../../../bus/usb
> -r--r--r-- 1 root root 4096 Feb 13 20:39 configuration
> -r--r--r-- 1 root root 4096 Feb 13 20:39 devnum
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 driver ->
> ../../../../../bus/usb/drivers/usb
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 ep_00 ->
> ../../../../../class/usb_endpoint/usbdev1.6_ep00
> -r--r--r-- 1 root root 4096 Feb 13 20:39 idProduct
> -r--r--r-- 1 root root 4096 Feb 13 20:39 idVendor
> -r--r--r-- 1 root root 4096 Feb 13 20:39 maxchild
> drwxr-xr-x 2 root root 0 Feb 13 20:39 power
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:audio3 ->
> ../../../../../class/sound/audio3
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 sound:controlC3 ->
> ../../../../../class/sound/controlC3
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:dmmidi3 ->
> ../../../../../class/sound/dmmidi3
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:dsp3 ->
> ../../../../../class/sound/dsp3
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 sound:hwC3D0 ->
> ../../../../../class/sound/hwC3D0
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:hwC3D1 ->
> ../../../../../class/sound/hwC3D1
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:midi3 ->
> ../../../../../class/sound/midi3
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:midiC3D0 ->
> ../../../../../class/sound/midiC3D0
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 sound:mixer3 ->
> ../../../../../class/sound/mixer3
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:pcmC3D0c ->
> ../../../../../class/sound/pcmC3D0c
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:pcmC3D0p ->
> ../../../../../class/sound/pcmC3D0p
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:pcmC3D2c ->
> ../../../../../class/sound/pcmC3D2c
> lrwxrwxrwx 1 root root 0 Feb 13 20:43 sound:pcmC3D2p ->
> ../../../../../class/sound/pcmC3D2p
> -r--r--r-- 1 root root 4096 Feb 13 20:39 speed
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 subsystem -> ../../../../../bus/usb
> --w------- 1 root root 4096 Feb 13 20:39 uevent
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 usb_device:usbdev1.6 ->
> ../../../../../class/usb_device/usbdev1.6
> lrwxrwxrwx 1 root root 0 Feb 13 20:39 usb_endpoint:usbdev1.6_ep00 ->
> ../../../../../class/usb_endpoint/usbdev1.6_ep00
> -r--r--r-- 1 root root 4096 Feb 13 20:39 version
>
> # cat /sys/bus/usb/devices/1-1/{idVendor,idProduct}
> 1604
> 8005
>
>
> Cheers.
> --
> rncbc aka Rui Nuno Capela
> rncbc@xxxxxxxxx
>
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