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>
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index a4d68d3..32607a6 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -1013,6 +1013,35 @@
/* ----------------------------------------------------------------- */
+/* Helper function for I2C legacy drivers */
+
+int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
+ const char *name, int (*probe)(struct i2c_client *))
+{
+ struct i2c_client *client;
+ int err;
+
+ client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
+ if (client == 0)
+ return -ENOMEM;
+
+ client->addr = address;
+ client->adapter = adapter;
+ client->driver = driver;
+ snprintf(client->name, sizeof(client->name) - 1, name);
+
+ err = probe(client);
+ if (err == 0) {
+ i2c_attach_client(client);
+ }
+ else {
+ kfree(client);
+ }
+ return err;
+}
+
+/* ----------------------------------------------------------------- */
+
EXPORT_SYMBOL(v4l2_norm_to_name);
EXPORT_SYMBOL(v4l2_video_std_construct);
@@ -1038,6 +1067,8 @@
EXPORT_SYMBOL(v4l2_chip_ident_i2c_client);
EXPORT_SYMBOL(v4l2_chip_match_host);
+EXPORT_SYMBOL(v4l2_i2c_attach);
+
/*
* Local variables:
* c-basic-offset: 8