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r: 4653
b: refs/heads/master
c: 1d772e2
h: refs/heads/master
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  4651: 71eafb0
v: v3
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Jean Delvare authored and Greg Kroah-Hartman committed Jul 11, 2005
1 parent b3f0f5e commit c2355db
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2 changes: 1 addition & 1 deletion [refs]
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refs/heads/master: a68e2f4895070f3a449bfe5ae1174b73cc900642
refs/heads/master: 1d772e2587da3c8b0fb8610fcc1c91fd82f87e52
11 changes: 7 additions & 4 deletions trunk/Documentation/i2c/dev-interface
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Expand Up @@ -14,9 +14,12 @@ 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.h>" and "#include <linux/i2c-dev.h>.
Yes, I know, you should never include kernel header files, but until glibc
knows about i2c, there is not much choice.
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 lm_sensors and is
meant to be included from user-space programs. You obviously want
the second one here.

Now, you have to decide which adapter you want to access. You should
inspect /sys/class/i2c-dev/ to decide this. Adapter numbers are assigned
Expand Down Expand Up @@ -78,7 +81,7 @@ Full interface description
==========================

The following IOCTLs are defined and fully supported
(see also i2c-dev.h and i2c.h):
(see also i2c-dev.h):

ioctl(file,I2C_SLAVE,long addr)
Change slave address. The address is passed in the 7 lower bits of the
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