I've upgraded the patch to kernel 3.3.8; get it . It also incorporates my patch for switching GPIO modes by writing to files in /sys/carambola: if you don't do that it won't get in the way.

FYI: The naming of the 1-wire dir has changed in the newer kernel: it lives in "/sys/devices/w1_bus_master1/" instead of "/sys/devices/w1 bus master/" now.

Thanks -- as it happens the old patch works for me against the latest kernel anyway, but I'm glad that you are keeping it up to date!

Can you explain the GPIO mode patch? And you're saying that it *isn't* needed for the 1-wire stuff, correct?

That patch is described ; it basically adds a few files in /sys to switch between GPU/UART/I2S/... so you don't have to use the mmio tool anymore to switch. If you don't write to those files, the patch doesn't do anything.

Can't make after this patch, see error below.

make -C /home/carambola/carambola/build_dir/linux-ramips_rt305x/linux-3.3.8 CROSS_COMPILE="mipsel-openwrt-linux-uclibc-" ARCH="mips" KBUILD_HAVE_NLS=no CONFIG_SHELL="/bin/bash" V='' CC="mipsel-openwrt-linux-uclibc-gcc"
make[5]: Entering directory `/home/carambola/carambola/build_dir/linux-ramips_rt305x/linux-3.3.8'
CHK include/linux/version.h
CHK include/generated/utsrelease.h
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
CC arch/mips/ralink/rt305x/mach-carambola.o
arch/mips/ralink/rt305x/mach-carambola.c:220:8: error: 'S_IRUGO' undeclared here (not in a function)
arch/mips/ralink/rt305x/mach-carambola.c:220:8: error: 'S_IWUGO' undeclared here (not in a function)
make[6]: *** [arch/mips/ralink/rt305x/mach-carambola.o] Error 1
make[5]: *** [arch/mips/ralink/rt305x] Error 2

Thanks, it's working now

Hi,
Temperature sensors like 18B20 work ok, but i have some problems with the DS2406 (single port PIO device). It shows up in the directory just like the DS18B20 but i can't figure out how to write to the PIOA of the device. I can't find good doc on the subject so if anybody has some experience on this please let me know.

Theo

Hmm, I'm not sure if that device is supported under Linux... I do see references to DS2408 chips, but no DS2406 is mentioned. It shouldn't be too hard to add support for those chips, though. I don't have the ICs myself, or I might have given it a try.

Hi Sprite-tm,

The DS2408 is indead similar but has 8 IO lines. The DS2406 only 1 and is in a T0-92 case just like an ordinary transistor. This makes it interesting because you could see it as a logic transitor with a 1w base/gate. It's output can sink 50mA @ 13V. I was think about maybe adapting the w1_2408 code, and it would be a great but long learning experience. All help is very welcome and i could send you a DS2406 if you want, so you could give it a try aswell.

The device is interesting indeed, a software-controlled transistor sounds awesome. I'd be interested in one of the devices; mail me at jeroen at spritesmods period com if you want my address.