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Linux Kernel Module for HD44780 with I2C Expander

License: Other

C 65.46% Makefile 1.46% Python 33.08%

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lcdi2c's Issues

Installation fails on a raspberry pi 3b+

I'm trying to install your lcdi2c driver on a raspberry pi 3b+ but the installation fails at

sudo dkms build -m lcdi2c -v 1.0.1

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...(bad exit status: 2)
make -j4 KERNELRELEASE=4.19.42-v7+ -C /lib/modules/4.19.42-v7+/build M=/var/lib/dkms/lcdi2c/1.0.1/build...(bad exit status: 2)
Error! Bad return status for module build on kernel: 4.19.42-v7+ (armv7l)
Consult /var/lib/dkms/lcdi2c/1.0.1/build/make.log for more information.

Logfile: cat /var/lib/dkms/lcdi2c/1.0.1/build/make.log

DKMS make.log for lcdi2c-1.0.1 for kernel 4.19.42-v7+ (armv7l)
Mon 10 Jun 16:17:48 UTC 2019
make: Entering directory '/usr/src/linux-headers-4.19.42-v7+'
scripts/Makefile.build:45: /var/lib/dkms/lcdi2c/1.0.1/build/Makefile: No such file or directory
make[1]: *** No rule to make target '/var/lib/dkms/lcdi2c/1.0.1/build/Makefile'.  Stop.
Makefile:1524: recipe for target '_module_/var/lib/dkms/lcdi2c/1.0.1/build' failed
make: *** [_module_/var/lib/dkms/lcdi2c/1.0.1/build] Error 2
make: Leaving directory '/usr/src/linux-headers-4.19.42-v7+'

System info

lsb_release -a

No LSB modules are available.
Distributor ID:	Raspbian
Description:	Raspbian GNU/Linux 9.9 (stretch)
Release:	9.9
Codename:	stretch

uname --all

Linux raspi3bplus 4.19.42-v7+ #1219 SMP Tue May 14 21:20:58 BST 2019 armv7l GNU/Linux

apt list --installed |grep headers

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

linux-headers-3.6-trunk-common/stable,now 3.6.9-1~experimental.1+rpi7 armhf [installed,automatic]
linux-headers-3.6-trunk-rpi/stable,now 3.6.9-1~experimental.1+rpi7 armhf [installed,automatic]
raspberrypi-kernel-headers/stable,now 1.20190517-1 armhf [installed]

Any guesses whats going wrong here ?

Thanks,
Michael.

Module is installed to the incorrect forder

This module was compiled under the following system (uname -a):
Linux orangepipc 4.13.9-sunxi #1 SMP Tue Oct 24 10:21:11 MSK 2017 armv7l GNU/Linux

According to the compilation section module should be installed in "module will be installed in /lib/modules/$(uname -r)/extra" folder.

Under this system "uname -r" looks like:
4.13.9-sunxi

But after performing command from compilation section "make -C /lib/modules/$(uname -r)/build M=$PWD modules_install" .ko nodule is installed in the following folder:
/lib/modules/4.13.9/extra

instead of
/lib/modules/4.13.9-sunxi/extra

Thx.
Dmitry.

Install from clean build fails: 'invalid argument' during install

I cloned the source from this repository onto a pi zero and build it there. I believe all prereqs are in place. The system responds with invalid argument but I don't see why. Any suggestions would be appreciated.

environment

dkms:2.6
Linux xxxxxxxx 5.4.51+ #1327 Thu Jul 23 10:53:06 BST 2020 armv6l GNU/Linux

clone and build

commands executed for clone are build are

git clone --depth 1 https://github.com/lucidm/lcdi2c.git /usr/src/lcdi2c-1.0.1
dkms add -m lcdi2c -v 1.0.1
dkms build -m lcdi2c -v 1.0.1
dkms install -m lcdi2c -v 1.0.1

The resulting output is

+ git clone --depth 1 https://github.com/lucidm/lcdi2c.git /usr/src/lcdi2c-1.0.1
Cloning into '/usr/src/lcdi2c-1.0.1'...
remote: Enumerating objects: 21, done.
remote: Counting objects: 100% (21/21), done.
remote: Compressing objects: 100% (17/17), done.
remote: Total 21 (delta 0), reused 12 (delta 0), pack-reused 0
Unpacking objects: 100% (21/21), done.
+ dkms add -m lcdi2c -v 1.0.1

Creating symlink /var/lib/dkms/lcdi2c/1.0.1/source ->
                 /usr/src/lcdi2c-1.0.1

DKMS: add completed.
+ dkms build -m lcdi2c -v 1.0.1

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area.............
make -j1 KERNELRELEASE=5.4.51+ -C /lib/modules/5.4.51+/build M=/var/lib/dkms/lcdi2c/1.0.1/build......................................
cleaning build area...........

DKMS: build completed.
+ dkms install -m lcdi2c -v 1.0.1

lcdi2c.ko:
Running module version sanity check.
modinfo: ERROR: Module /lib/modules/5.4.51+/lcdi2c.ko not found.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.4.51+/kernel/drivers/auxdisplay/

depmod.....
Job for systemd-modules-load.service failed because the control process exited with error code.
See "systemctl status systemd-modules-load.service" and "journalctl -xe" for details.

systemctl status systemd-modules-load.service

● systemd-modules-load.service - Load Kernel Modules
   Loaded: loaded (/lib/systemd/system/systemd-modules-load.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2020-07-26 10:02:55 BST; 7min ago
     Docs: man:systemd-modules-load.service(8)
           man:modules-load.d(5)
  Process: 22756 ExecStart=/lib/systemd/systemd-modules-load (code=exited, status=1/FAILURE)
 Main PID: 22756 (code=exited, status=1/FAILURE)

Jul 26 10:02:54 xxxxxxxx systemd[1]: Starting Load Kernel Modules...
Jul 26 10:02:55 xxxxxxxx systemd-modules-load[22756]: Failed to insert module 'lcdi2c': Invalid argument
Jul 26 10:02:55 xxxxxxxx systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
Jul 26 10:02:55 xxxxxxxx systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
Jul 26 10:02:55 xxxxxxxx systemd[1]: Failed to start Load Kernel Modules.

journalctl -xe

Jul 26 10:02:54 xxxxxxxx systemd[1]: Starting Load Kernel Modules...
-- Subject: A start job for unit systemd-modules-load.service has begun execution
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- A start job for unit systemd-modules-load.service has begun execution.
-- 
-- The job identifier is 1130.
Jul 26 10:02:55 xxxxxxxx systemd-modules-load[22756]: Failed to insert module 'lcdi2c': Invalid argument
Jul 26 10:02:55 xxxxxxxx systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- An ExecStart= process belonging to unit systemd-modules-load.service has exited.
-- 
-- The process' exit code is 'exited' and its exit status is 1.
Jul 26 10:02:55 xxxxxxxx systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- The unit systemd-modules-load.service has entered the 'failed' state with result 'exit-code'.
Jul 26 10:02:55 xxxxxxxx systemd[1]: Failed to start Load Kernel Modules.
-- Subject: A start job for unit systemd-modules-load.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- 
-- A start job for unit systemd-modules-load.service has finished with a failure.
-- 
-- The job identifier is 1130 and the job result is failed.
Jul 26 10:02:56 xxxxxxxx sudo[21419]: pam_unix(sudo:session): session closed for user root

automatic load during boot not working ?

Hi !

I'm trying to load the module during boot by adding the module name to /etc/modules right after i2c-dev

>  cat /etc/modules
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

i2c-dev
lcdi2c

But after booting there is no /dev/lcdi2c device.
dmesg shows:

> dmesg |grep lcd
[    3.763602] lcdi2c: loading out-of-tree module taints kernel.

If i load the module manually:
> sudo modprobe lcdi2c

dmesg shows

> dmesg |grep lcd
[    3.763602] lcdi2c: loading out-of-tree module taints kernel.
[   83.829014] lcdi2c 1-0027: 16x2 LCD using bus 0x1, at address 0x27
[   83.829306] lcdi2c 1-0027: registered with major 241

and the module is working fine.

> ll /dev/lcdi2c
crw-rw---- 1 root dialout 241, 0 Jun 12 13:02 /dev/lcdi2c

Do I miss something ??

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