Re: Patch - sharing RTC timer between kernel and user space

[Jaroslav Kysela]

On Thu, 28 Feb 2002, Roman Zippel wrote:

> Hi,
> 
> On Thu, 28 Feb 2002, Jaroslav Kysela wrote:
> 
> > Using the RTC timer is optional. The default timer is system timer, of 
> > course.
> 
> Who is setting up this timer? This patch can also be done in userspace:
> 
> 	fd = open("/dev/rtc",...);
> 	ioctl(alsafd, RTCFD, fd);
> 
> in the alsa driver you can do:
> 
> 	file = fget(fd);
> 	...
> 	if (file->f_op && file->f_op->ioctl)
> 		file->f_op->ioctl(file->f_dentry->d_inode, file, cmd, arg);
> 	...
> 	fput(file);

We need also a callback called at interrupt time.

						Jaroslav

-----
Jaroslav Kysela <[e-mail]>
Linux Kernel Sound Maintainer
ALSA Project  http://www.alsa-project.org
SuSE Linux    http://www.suse.com