aboutsummaryrefslogtreecommitdiff
path: root/Documentation/i2c/i2c-stub
diff options
context:
space:
mode:
authorJean Delvare <khali@linux-fr.org>2007-10-13 23:56:31 +0200
committerJean Delvare <khali@hyperion.delvare>2007-10-13 23:56:31 +0200
commit9d90c1fd9bdbffb456d1b1ef05215343503fd0b0 (patch)
tree7569f3402bdbb23c000ac59ad81522d3944f53f8 /Documentation/i2c/i2c-stub
parent567a244b8b431ee8399bb43c7e65df605bdd5458 (diff)
downloadlinux-9d90c1fd9bdbffb456d1b1ef05215343503fd0b0.tar.gz
i2c-stub: Support multiple chips
Add support for multiple chips to i2c-stub. I've changed the memory allocation scheme from static to dynamic, so that we don't waste too much memory. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'Documentation/i2c/i2c-stub')
-rw-r--r--Documentation/i2c/i2c-stub18
1 files changed, 8 insertions, 10 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub
index 9cc081e6976..89e69ad3436 100644
--- a/Documentation/i2c/i2c-stub
+++ b/Documentation/i2c/i2c-stub
@@ -6,13 +6,14 @@ This module is a very simple fake I2C/SMBus driver. It implements four
types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, and
(r/w) word data.
-You need to provide a chip address as a module parameter when loading
-this driver, which will then only react to SMBus commands to this address.
+You need to provide chip addresses as a module parameter when loading this
+driver, which will then only react to SMBus commands to these addresses.
No hardware is needed nor associated with this module. It will accept write
-quick commands to one address; it will respond to the other commands (also
-to one address) by reading from or writing to an array in memory. It will
-also spam the kernel logs for every command it handles.
+quick commands to the specified addresses; it will respond to the other
+commands (also to the specified addresses) by reading from or writing to
+arrays in memory. It will also spam the kernel logs for every command it
+handles.
A pointer register with auto-increment is implemented for all byte
operations. This allows for continuous byte reads like those supported by
@@ -26,8 +27,8 @@ The typical use-case is like this:
PARAMETERS:
-int chip_addr:
- The SMBus address to emulate a chip at.
+int chip_addr[10]:
+ The SMBus addresses to emulate chips at.
CAVEATS:
@@ -41,9 +42,6 @@ If the hardware for your driver has banked registers (e.g. Winbond sensors
chips) this module will not work well - although it could be extended to
support that pretty easily.
-Only one chip address is supported - although this module could be
-extended to support more.
-
If you spam it hard enough, printk can be lossy. This module really wants
something like relayfs.