GPIO and Alix leds again

[PatrickB]

Good evening.

root@alixbox> ll /sys/class/gpio
total 0
–w

---

1 root root 4.0K Mar 1 11:32 export
–w

---

1 root root 4.0K Mar 1 11:32 unexport

When that exists, then it should be quite simple:

echo “27” > /sys/class/gpio/export
echo “out” > /sys/class/gpio/gpio27/direction
echo “1” > /sys/class/gpio/gpio27/value

The reality:

root@alixbox> echo “27” > /sys/class/gpio/export
bash: echo: write error: No such device

Idem with any other GPIO # (the leds are at 6, 25 and 27).

Any idea ? Did someone play with the GPIO ?

Thanks, best regards

[PatrickB]

Hello.

It does not work better when done from the Pre/Post-Boot script 🙁

Modules missing ?

X-ref: https://www.zeroshell.org/forum/viewtopic.php?p=14001

Any idea welcome.

Thanks, Best regards.

[PatrickB]

Hello.

Still the headache…

All the needed stuff looks to be in place:

>lsmod
…
leds_gpio 1730 0

> ll /sys/devices/platform
total 0
…
drwxr-xr-x 2 root root 0 Apr 3 2015 leds-gpio

> ll /sys/devices/platform/leds-gpio
total 0
-r–r–r– 1 root root 4.0K Apr 3 21:10 modalias
lrwxrwxrwx 1 root root 0 Apr 3 2015 subsystem -> ../../../bus/platform
-rw-r–r– 1 root root 4.0K Apr 3 2015 uevent

BUT:

> cat /cdrom/usr/src/.config |more
…
# CONFIG_MFD_CS5535 is not set
…
#
# LED drivers
#
CONFIG_LEDS_LM3530=m
CONFIG_LEDS_NET48XX=m
CONFIG_LEDS_WRAP=m
CONFIG_LEDS_PCA9532=m
CONFIG_LEDS_PCA9532_GPIO=y
CONFIG_LEDS_GPIO=m
CONFIG_LEDS_LP3944=m
CONFIG_LEDS_LP5521=m
CONFIG_LEDS_LP5523=m
# CONFIG_LEDS_CLEVO_MAIL is not set
CONFIG_LEDS_PCA955X=m
CONFIG_LEDS_PCA9633=m
CONFIG_LEDS_BD2802=m
CONFIG_LEDS_INTEL_SS4200=m
CONFIG_LEDS_LT3593=m
CONFIG_LEDS_TCA6507=m
CONFIG_LEDS_OT200=m
CONFIG_LEDS_TRIGGERS=y

#
# LED Triggers
#
CONFIG_LEDS_TRIGGER_TIMER=m
CONFIG_LEDS_TRIGGER_HEARTBEAT=m
CONFIG_LEDS_TRIGGER_BACKLIGHT=m
CONFIG_LEDS_TRIGGER_GPIO=m
CONFIG_LEDS_TRIGGER_DEFAULT_ON=m
…

>modprobe -l
…
kernel/drivers/leds/trigger/ledtrig-timer.ko
kernel/drivers/leds/trigger/ledtrig-oneshot.ko
kernel/drivers/leds/trigger/ledtrig-heartbeat.ko
kernel/drivers/leds/trigger/ledtrig-backlight.ko
kernel/drivers/leds/trigger/ledtrig-gpio.ko
kernel/drivers/leds/trigger/ledtrig-default-on.ko
kernel/drivers/leds/trigger/ledtrig-transient.ko
kernel/drivers/leds/trigger/ledtrig-camera.ko
kernel/drivers/leds/leds-bd2802.ko
kernel/drivers/leds/leds-lm3530.ko
kernel/drivers/leds/leds-lm3642.ko
kernel/drivers/leds/leds-net48xx.ko
kernel/drivers/leds/leds-wrap.ko
kernel/drivers/leds/leds-pca9532.ko
kernel/drivers/leds/leds-gpio.ko
kernel/drivers/leds/leds-lp3944.ko
kernel/drivers/leds/leds-lp55xx-common.ko
kernel/drivers/leds/leds-lp5521.ko
kernel/drivers/leds/leds-lp5523.ko
kernel/drivers/leds/leds-lp5562.ko
kernel/drivers/leds/leds-lp8501.ko
kernel/drivers/leds/leds-tca6507.ko
kernel/drivers/leds/leds-ot200.ko
kernel/drivers/leds/leds-pca955x.ko
kernel/drivers/leds/leds-pca963x.ko
kernel/drivers/leds/leds-pca9685.ko
kernel/drivers/leds/leds-ss4200.ko
kernel/drivers/leds/leds-lt3593.ko
kernel/drivers/leds/leds-lm355x.ko
kernel/drivers/leds/leds-blinkm.ko
…

Well, visibly we must have all ready for other platforms,
…but there is no ???-cs5535.ko present in both the /gpio/ and /leds/ sections, bad luck for the Alix 😥

> echo “27” > /sys/class/gpio/export
bash: echo: write error: No such device

I tried to encrust the one from this package:
kmod-cs5535_3.10.49-1_x86.ipk from:
https://downloads.openwrt.org/barrier_breaker/14.07/x86/alix2/packages/base/

But the binary is not compatible (desperate attempt) 👿

=> I see no other solution than a kernel recompiled with the driver for the Alix available as a module.

Any other idea ?

Thanks, Best regards.

[Author]

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