V4L/DVB (6451): v4l2: add support for bus-based I2C drivers

Two new headers were added: one for I2C drivers that are only used
by V4L2 drivers converted to the new bus-based I2C API, and one that
can be used by both converted and unconverted drivers (at the expense of
some additional overhead).

To support the legacy I2C API a helper function was added to v4l2-common.c.

These headers take care of all the 'boilerplate' code that all V4L2 I2C drivers
have in common and will automatically support the bus-based I2C API introduced
in kernel 2.6.22.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index c019c1e99895..475d0d8275e0 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -104,6 +104,17 @@ int v4l2_chip_match_host(u32 id_type, u32 chip_id);
 
 /* ------------------------------------------------------------------------- */
 
+/* Helper function for I2C legacy drivers */
+
+struct i2c_driver;
+struct i2c_adapter;
+struct i2c_client;
+
+int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
+                const char *name, int (*probe)(struct i2c_client *));
+
+/* ------------------------------------------------------------------------- */
+
 /* Internal ioctls */
 
 /* VIDIOC_INT_DECODE_VBI_LINE */