Red Hat Bugzilla – Bug 484128
Provide i2c-dev.h with inline userspace functions
Last modified: 2017-08-26 17:34:35 EDT
Description of problem:
I just ran across a piece of robot hardware which has source code available for using it (hooray!). But it needs i2c and for this the i2c-dev.h header with the inline defined functions otherwise hidden in the kernel guts.
Version-Release number of selected component (if applicable):
The i2c-dev.h header from i2c-tools should be made available. Actually I'm not sure about the best way, maybe this should be added as a kernel patch. Otherwise the kernel should not install that particular header and it could be in a i2c-devel package. The i2c-dev.h that comes with the kernel headers is pretty much useless. The one from i2c-tools is a super set of what is in kernel headers and provides everything needed. Debian provides this as libi2c-dev, which contains this specific kernel header.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
More information and reason for this action is here:
Any progress or comments on this one?
This still persists for F-12 and also Rawhide. Are you willing to fix this?
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This was never fixed and continues to be an issue on Fedora 25.
There are two forms of the i2c-dev.h header, a stock one which does not provide an interface to the smbus protocol:
And one which does (this is mentioned in the above document). As per the original post here, on Debian derived systems the full version, against which software using the interface can be compiled, is in the 'libi2c-dev' package.
There is some indication here:
That (presumably to mitigate confusion) the header would be moved to 'include/i2c/smbus.h' instead, however, nothing further seems to have happened since 2012 and as far as I am aware no linux system uses that path. Also, this file is not available in any distro packaging of i2c-tools including Fedora's.
Hence, THE HEADER IS NOT AVAILABLE IN ANY FEDORA PACKAGE. This means in order to compile software which requires it, it must be copied in from somewhere (e.g., a Debian install). The header just defines wrappers on ioctl(), and so does not require an actual userspace library (i.e., the functionality is in the kernel).
This appears to still be an issue on F26.