[lm-sensors] [PATCH] I2C: Clarify the usage of i2c-dev.h

Greg KH gregkh at suse.de
Tue Jul 12 00:02:57 CEST 2005

[PATCH] I2C: Clarify the usage of i2c-dev.h

Upon suggestion by Nils Roeder, here is an update to the i2c
documentation to clarify which header files user-space applications
relying on the i2c-dev interface should include.

Signed-off-by: Jean Delvare <khali at linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>

commit 1d772e2587da3c8b0fb8610fcc1c91fd82f87e52
tree 816702c0b2b1a37f772b8884ce2177b88af4ab73
parent a68e2f4895070f3a449bfe5ae1174b73cc900642
author Jean Delvare <khali at linux-fr.org> Sat, 25 Jun 2005 11:37:40 +0200
committer Greg Kroah-Hartman <gregkh at suse.de> Mon, 11 Jul 2005 14:10:37 -0700

 Documentation/i2c/dev-interface |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/Documentation/i2c/dev-interface b/Documentation/i2c/dev-interface
--- a/Documentation/i2c/dev-interface
+++ b/Documentation/i2c/dev-interface
@@ -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
@@ -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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