i2c: Add driver suspend/resume/shutdown support

Driver model updates for the I2C core:

 - Add new suspend(), resume(), and shutdown() methods.  Use them in the
   standard driver model style; document them.

 - Minor doc updates to highlight zero-initialized fields in drivers, and
   the driver model accessors for "clientdata".

If any i2c drivers were previously using the old suspend/resume calls
in "struct driver", they were getting warning messages ... and will
now no longer work.  Other than that, this patch changes no behaviors;
and it lets I2C drivers use conventional PM and shutdown support.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 71e50d3e492f..9428092017e3 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -125,7 +125,12 @@ struct i2c_driver {
          * it must be freed here.
          */
         int (*detach_client)(struct i2c_client *);
-        
+
+        /* driver model interfaces that don't relate to enumeration  */
+        void (*shutdown)(struct i2c_client *);
+        int (*suspend)(struct i2c_client *, pm_message_t mesg);
+        int (*resume)(struct i2c_client *);
+
         /* a ioctl like command that can be used to perform specific functions
          * with the device.
          */