Takashi Iwai wrote: > At Wed, 27 Sep 2006 20:58:57 +0200 (CEST), > Jaroslav Kysela wrote: > >> On Wed, 27 Sep 2006, James Courtier-Dutton wrote: >> >> >>> Hi, >>> >>> The E-MU 1820m consists of a PCI card with a connector on it. >>> A cable then runs to an external box called the AudioDock with all the >>> audio IO on it. >>> The AudioDock is hot pluggable. >>> The problem is that no interrupts occur if one connects the AudioDock. >>> One would have to poll the device until one saw a certain bit being set. >>> One would then know the AudioDock was there. The driver then needs to >>> load some firmware into the AudioDock. >>> >>> My question is, what should I use to monitor for the plug/unplug of the >>> AudioDock? I would expect some user land app could do the polling, but >>> that might require some new ALSA api to support it. >>> >> I would use a low resolution (probably ~1 sec) system timer to check this >> bit and request the additional firmware in tasklet or workqueue. In this >> case, the userland is not required to participate. >> > > Agreed (tasklet cannot used for firmware loading, though). > > The unplug would be more tough, I guess. The driver has to accept > that the box can be unplugged at any time. > > > Takashi > Ok, that's and interesting problem them, because about the only thing it has to do when plugged in is load the firmware. So, if a tasklet it not useable for firmware loading, what should I use? It is a shame that the kernel does not have a global poll function, where one justs adds their function to a queue with minimum and maximum poll intervals, and a single kernel task then steps through each one doing the poll. If the poll returns true, the kernel should then schedule a function to be run. This would use less task switching. James ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
