i2c-algo-pcf: Multi-master lost-arbitration improvement

Improve lost-arbitration handling of PCF8584.  This is necessary for
support of a currently out-of-kernel driver for Sun Microsystems E250
environmental management; perhaps others.

Signed-off-by: Eric Brower <ebrower@gmail.com>
Acked-by: Dan Smolik <marvin@mydatex.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/i2c-algo-pcf.h b/include/linux/i2c-algo-pcf.h
index 77afbb60fd11..74fb6f889a77 100644
--- a/include/linux/i2c-algo-pcf.h
+++ b/include/linux/i2c-algo-pcf.h
@@ -36,6 +36,12 @@ struct i2c_algo_pcf_data {
         /* local settings */
         int udelay;
         int timeout;
+
+        /* Multi-master lost arbitration back-off delay (msecs)
+         * This should be set by the bus adapter or knowledgable client
+         * if bus is multi-mastered, else zero
+         */
+        unsigned long lab_mdelay;
 };
 
 int i2c_pcf_add_bus(struct i2c_adapter *);