[alsa-devel] include/uapi/firewire.h for other firewire drivers

Clemens Ladisch clemens at ladisch.de
Mon Oct 28 09:29:47 CET 2013

Takashi Sakamoto wrote:
>> Because every device can have settings that should not be changed
>> while streaming.
> Currently my Fireworks/BeBoB driver give Control interfaces for these
> settings, like changing sampling rate, switching digital interface.
> The primarry purpose of these is the same, a prevention from stopping
> streaming. The secondary purpose is debug codes for these functionality.
> But based on firewire.h interface, it is the applications'
> responsibility, not drivers'. Is my understanding correct?

Yes; the intent is for the kernel driver to handle only those settings
that would be impossible or very difficult to handle with a separate
user space process.  (For example, the sample rate is set by the
application on the ALSA device; it would be a bad idea for the driver to
_ask_ the control panel application to change it.)

> Here some devices has "write-only" settings. For such device, my
> driver remember these settings. If the applications has such
> responsibility, there may be some inconsistency.

This is another example of a setting that must be in the kernel driver.


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