Bonjour Louis-Martin, > I'm writing a device driver for a Philips PCA9555 chip, which is a > 16-bit I/O port with interrupt I2C device. I remember we have been discussing about this chip some times ago. A guy named MonMotha was working on a driver like one year ago. Chosen mailing-list threads: http://archives.andrew.net.au/lm-sensors/msg03241.html http://archives.andrew.net.au/lm-sensors/msg06033.html You will find driver code at the end of the second thread, in case you want to compare with what you have. > Since our project in for an embedded system, the driver itself it > tightly bound to the way the chip is integrated into our hardware. I > doubt it is of any interest for anyone outside, considering it > relies on a homebrewed CPLD for interrupt management. I understand your point. I will be working with a PCA9556 myself pretty soon, and am facing the same problem. The chip could be used for completely different things in other systems, so writing a generic driver doesn't seem to make much sense. Maybe I'll end up writing a driver though, with a low-level interface only accessible to other kernel modules and not user-space. I have to think about it a little more. The idea of having a driver for these chip is that we don't want people to rewrite code which already exists. > However, before doing that, I "backported" the LM77 driver found in > Linux 2.6 to Linux 2.4. If you are interested in getting it, I will > be glad to provide it. Just tell me where to submit it, and maybe > give me 1 hour to remove customizations I made for supporting our > embedded platform (like interrupts)! The basic functionality (temp > read/write) should run fine on any host hardware (PC / Mac / > whatever). Yes, we are interested. The prefered form is a patch against the latest lm_sensors2 CVS tree. Note that we are in a feature freeze state for now, until we release 2.8.8. This should happen within a week or two. You can still provide a patch now and we'll apply it later. Ideally the patch would contain a kernel driver in kernel/chips, changes to kernel/chips/Module.mk for it to be recognized, updates to libsensors, a new section in etc/sensors.conf.eg, updates to prog/sensors, an update to doc/chips/SUMMARY and documentation in doc/chips/lm77. If you only provide part of this, this is welcome too. > Thanks for getting back to me. > Merci ! Tout le plaisir est pour moi :) -- Jean Delvare http://khali.linux-fr.org/
