Re: ioctl for i2c devices

[Paul Goyette <paul%whooppee.com@localhost>]

The existing ioctl mechanism is for access to the i2c bus itself.  For 
an example of how to use the existing i2c ioctl interface, please 
take a look at $SRCDIR/usr.sbin/i2cscan/i2cscan.c

Note that this is really different from providing an ioctl for accessing 
your specific i2c device.  The existing mechanism accesses the i2c bus 
itself.  Your device driver would need to have its own routines.

Please feel free to submit your completed driver to us for review.


On Tue, 5 Feb 2013, Rohan Akela wrote:

> Hello
>
> I am in the process of implementing driver for I2C device and need to
> read/write to device from user space. I was thinking of using usual
> ioctl based mechanism to do it.I don't see any issues in implementing
> ioctls for I2C device. But this email thread
> http://osdir.com/ml/os.netbsd.devel.embedded/2006-05/msg00008.html
> seems to suggest that I2c drivers in NetBSD should not use ioctl. I am
> not sure if the observations in thread are still relevant.
>
> What is the issue in implementing ioctl for I2C device ?
>
> If I submit I2C driver to NetBSD,will it accepted or rejected ?
>
> Thanks
>
> !DSPAM:51117ee3145151234514069!

-------------------------------------------------------------------------
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
| Customer Service | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
| Kernel Developer |                          | pgoyette at netbsd.org  |
-------------------------------------------------------------------------