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authorJean Delvare <khali@linux-fr.org>2009-12-06 17:06:29 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-06 17:06:29 +0100
commit38f41f282f1f88b4038f019de51cb95984e569d5 (patch)
treed885feffa6639bfb8824c4e7a68135ceed436fe4 /Documentation/i2c
parent4710317891e4824ce1510a6b5066abbd3e917750 (diff)
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i2c-stub: Allow user to disable some commands
Add a module parameter to override the functionality bitfield. This lets the user disable some commands. This can be used to force a chip driver to take different code paths. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/i2c-stub6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub
index d9c383b..326d1ee 100644
--- a/Documentation/i2c/i2c-stub
+++ b/Documentation/i2c/i2c-stub
@@ -33,6 +33,12 @@ PARAMETERS:
int chip_addr[10]:
The SMBus addresses to emulate chips at.
+unsigned long functionality:
+ Functionality override, to disable some commands. See I2C_FUNC_*
+ constants in <linux/i2c.h> for the suitable values. For example,
+ value 0x1f0000 would only enable the quick, byte and byte data
+ commands.
+
CAVEATS:
If your target driver polls some byte or word waiting for it to change, the
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