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authorDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-13 15:25:59 +0100
committerDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-13 15:25:59 +0100
commit30beab1491f0b96b2f23d3fb68af01fd921a16d8 (patch)
treec580bdc0846269fbb10feeda901ecec1a48ee2ef /Documentation/i2c/dev-interface
parent21af6c4f2aa5f63138871b4ddd77d7ebf2588c9d (diff)
parentc32511e2718618f0b53479eb36e07439aa363a74 (diff)
downloadop-kernel-dev-30beab1491f0b96b2f23d3fb68af01fd921a16d8.zip
op-kernel-dev-30beab1491f0b96b2f23d3fb68af01fd921a16d8.tar.gz
Merge with /shiny/git/linux-2.6/.git
Diffstat (limited to 'Documentation/i2c/dev-interface')
-rw-r--r--Documentation/i2c/dev-interface15
1 files changed, 9 insertions, 6 deletions
diff --git a/Documentation/i2c/dev-interface b/Documentation/i2c/dev-interface
index 09d6cda..b849ad6 100644
--- 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
@@ -97,10 +100,10 @@ ioctl(file,I2C_PEC,long select)
ioctl(file,I2C_FUNCS,unsigned long *funcs)
Gets the adapter functionality and puts it in *funcs.
-ioctl(file,I2C_RDWR,struct i2c_ioctl_rdwr_data *msgset)
+ioctl(file,I2C_RDWR,struct i2c_rdwr_ioctl_data *msgset)
Do combined read/write transaction without stop in between.
- The argument is a pointer to a struct i2c_ioctl_rdwr_data {
+ The argument is a pointer to a struct i2c_rdwr_ioctl_data {
struct i2c_msg *msgs; /* ptr to array of simple messages */
int nmsgs; /* number of messages to exchange */
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