[Nut-upsdev] [PATCH] Support for ASEM UPS on Linux/i2c

Giuseppe Corbelli giuseppe.corbelli at copanitalia.com
Tue Jul 8 07:29:42 UTC 2014

On 08/07/2014 01:02, Charles Lepple wrote:
>>> Sorry I did not test this sooner - this went to Gmane but not to my email.
>>> If you have time, could you please write up a quick man page for this driver?
>>> Also, there seem to be some missing symbols and include files:
>>> http://buildbot.networkupstools.org/public/nut/waterfall?branch=asem_i2c
>> The problem is that linux/i2c-dev.h must come from libi2c-dev to define the required functions. Same header is part of the kernel, but without required functions. Changed the configure.ac check to look for the functions, not just the header.
>> To build the driver you'll need libi2c-dev package (part of i2c-tools) on debian.
> libi2c-dev is now installed on the ubuntu-trusty builder.
> configure:10067: checking whether i2c_smbus_read_word_data is declared
> configure:10067: gcc -c -g -O2 -Wall -Wsign-compare  conftest.c >&5
> In file included from conftest.c:72:0:
> /usr/include/linux/i2c-dev.h: In function 'i2c_smbus_write_quick':
> /usr/include/linux/i2c-dev.h:176:55: error: 'NULL' undeclared (first use in this function)
>    return i2c_smbus_access(file,value,0,I2C_SMBUS_QUICK,NULL);
>                                                         ^
> /usr/include/linux/i2c-dev.h:176:55: note: each undeclared identifier is reported only once for each function it appears in
> /usr/include/linux/i2c-dev.h: In function 'i2c_smbus_write_byte':
> /usr/include/linux/i2c-dev.h:191:41: error: 'NULL' undeclared (first use in this function)
>                            I2C_SMBUS_BYTE,NULL);
> Ref:
> http://buildbot.networkupstools.org/public/nut/builders/Ubuntu-trusty-x64/builds/20/steps/configure/logs/config.log

Seems that on x64 architectures NULL is not #defined in <stddef.h>
the attached patch #includes <stdio.h> in AC_CHECK_DECLS. Tested on an ubuntu 
12.10 x64, seems to solve the issue.

             Giuseppe Corbelli
WASP Software Engineer, Copan Italia S.p.A
Phone: +390303666318  Fax: +390302659932
E-mail: giuseppe.corbelli at copanitalia.com
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