Joe O'Donnell wrote: > Dear Jim Cromie, > Thank you for creating the Linux pc8736 driver. I am attempting to use > the driver to allow reading of the gpio pins on my Soekris 4081 board. > May I ask for some more information on how to get the driver working? > > I googled for and found 1 page with advice on how to use the driver: > > http://lists.soekris.com/pipermail/soekris-tech/2006-November/011203.html
Curious link you found - I dont need any of those workarounds either, and I had difficulty relating it to your problems. you might try gmane.org, theyve mirrored the soekris-tech ML, and its searchable ! http://search.gmane.org/?query=gpio&author=&group=gmane.comp.hardware.soekris.technical&sort=relevance&DEFAULTOP=and&%3E=Next&TOPDOC=20&xP=gpio&xFILTERS=Gcomp.hardware.soekris.technical---A that said, I couldnt find some posts that I was sure I sent (once upon a time!) > > I tried the instructions from the above, but the modprobe.d referenced > shell scipt produced errors. referenced shell script ?? > The device creation script did create the devices. I tried insmod > pc87360x_gpio.ko which apparently did load the driver. However cat > /dev/gpio-0 prodcued "cat: /dev/gpio-0: No such device" The pyramid > linux distribution I am using uses the udev system. In your response > to the above post you mentioned: > > *********** > >/ install pc8736x_gpio /sbin/modprobe --ignore-install pc8736x_gpio && > />/ /usr/local/sbin/gpio-dev create > />/ > />/ > > / > I don't have to do that workaround, but I wasnt using udev then either. > You could just make the nodes unconditionally, say in rc.local. > This simplifies a tiny bit, and if the module isnt there, the user App > still gets an error that is readily identifiable: > > soekris:/dev# cat gpio-00 > cat: gpio-00: No such device or address > You seem to be missing the device-special files, your comment to the contrary notwithstnding. Can you double-check that these (or similar) are present ? soekris:~# ls -l /dev/gpio-* crw-r--r-- 1 root root 240, 12 Jun 13 21:52 /dev/gpio-12 crw-r--r-- 1 root root 240, 13 Jun 13 21:52 /dev/gpio-13 crw-r--r-- 1 root root 240, 20 Jun 13 21:52 /dev/gpio-20 crw-r--r-- 1 root root 240, 21 Jun 13 21:52 /dev/gpio-21 crw-r--r-- 1 root root 240, 22 Jun 13 21:52 /dev/gpio-22 crw-r--r-- 1 root root 240, 23 Jun 13 21:52 /dev/gpio-23 crw-r--r-- 1 root root 240, 24 Jun 13 21:52 /dev/gpio-24 crw-r--r-- 1 root root 240, 25 Jun 13 21:52 /dev/gpio-25 crw-r--r-- 1 root root 240, 26 Jun 13 21:52 /dev/gpio-26 crw-r--r-- 1 root root 240, 27 Jun 13 21:52 /dev/gpio-27 crw-r--r-- 1 root root 240, 4 Jun 13 21:52 /dev/gpio-4 crw-r--r-- 1 root root 240, 5 Jun 13 21:52 /dev/gpio-5 you make them like so : mknod /dev/gpio-20 c $major 20; mknod /dev/gpio-21 c $major 21; mknod /dev/gpio-22 c $major 22; your $major must match with what the driver is expecting, whether default, or as given in more /etc/modprobe.d/gpio # assign last 2 dynamic devnums to gpio (255..240) options scx200_gpio major=240 options pc8736x_gpio major=241 > However lsmod does list the module as being there, but the above > mentioned error is still happening. May I ask your advice on which > Linux areas I should research more about in order to figure out how to > solve the problem? if the info above doesnt help, post to list, with: - ls -l /dev/gpio* - lsmod generally, you should : - subscribe to soekris-tech ML. - continue this thread there - so that others, archives can pick it up. - consider building your own kernel, enabling these drivers: scx200_gpio 4892 0 pc8736x_gpio 5852 0 pc87360 19572 0 ohci_hcd 17180 0 hwmon_vid 2704 1 pc87360 scx200_hrt 2520 0 [permanent] ledtrig_heartbeat 2832 0 usbcore 117712 3 ndiswrapper,ohci_hcd led_class 5116 0 scx200 4704 2 scx200_gpio,scx200_hrt nsc_gpio 3216 2 scx200_gpio,pc8736x_gpio Once youve built your own, you can add "#define DEBUG 1" to the top of *_gpio, to turn on debug-prints. to see those debug-prints on console : soekris:~# sysctl -w kernel.printk=8 > > Thank you, > Joe O'Donnnell > hth -jimc _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
