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| author | Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2018-03-01 11:14:24 +0200 |
|---|---|---|
| committer | Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2018-03-01 11:14:24 +0200 |
| commit | bba73071b6f71be0a101658d7c13866e30b264a6 (patch) | |
| tree | 2a0ea1fc5fd975f1c2e9e50de5bb3cb2cb3cb5f7 /Documentation/i2c/dev-interface | |
| parent | c71b53cc66c5053ff3524a6132f8fc8199d618c3 (diff) | |
| parent | f073d78eeb8efd85718e611c15f9a78647751dea (diff) | |
| download | blackbird-obmc-linux-bba73071b6f71be0a101658d7c13866e30b264a6.tar.gz blackbird-obmc-linux-bba73071b6f71be0a101658d7c13866e30b264a6.zip | |
Merge drm-next into drm-intel-next-queued (this time for real)
To pull in the HDCP changes, especially wait_for changes to drm/i915
that Chris wants to build on top of.
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'Documentation/i2c/dev-interface')
| -rw-r--r-- | Documentation/i2c/dev-interface | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/Documentation/i2c/dev-interface b/Documentation/i2c/dev-interface index 5ff19447ac44..d04e6e4964ee 100644 --- a/Documentation/i2c/dev-interface +++ b/Documentation/i2c/dev-interface @@ -17,13 +17,16 @@ i2c-10, ...). All 256 minor device numbers are reserved for i2c. C example ========= -So let's say you want to access an i2c adapter from a C program. The -first thing to do is "#include <linux/i2c-dev.h>". Please note that -there are two files named "i2c-dev.h" out there, one is distributed -with the Linux kernel and is meant to be included from kernel -driver code, the other one is distributed with i2c-tools and is -meant to be included from user-space programs. You obviously want -the second one here. +So let's say you want to access an i2c adapter from a C program. +First, you need to include these two headers: + + #include <linux/i2c-dev.h> + #include <i2c/smbus.h> + +(Please note that there are two files named "i2c-dev.h" out there. One is +distributed with the Linux kernel and the other one is included in the +source tree of i2c-tools. They used to be different in content but since 2012 +they're identical. You should use "linux/i2c-dev.h"). Now, you have to decide which adapter you want to access. You should inspect /sys/class/i2c-dev/ or run "i2cdetect -l" to decide this. |
