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

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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>
This commit is contained in:
Hans Verkuil
2007-09-12 08:32:50 -03:00
committed by Mauro Carvalho Chehab
parent 5ef4730d1b
commit 8ffbc65594
4 changed files with 235 additions and 0 deletions
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31
drivers/media/video/v4l2-common.c
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@@ -1013,6 +1013,35 @@ int v4l2_chip_match_host(u32 match_type, u32 match_chip)
/* ----------------------------------------------------------------- */
/* 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_match_i2c_client);
EXPORT_SYMBOL(v4l2_chip_ident_i2c_client);
EXPORT_SYMBOL(v4l2_chip_match_host);
EXPORT_SYMBOL(v4l2_i2c_attach);
/*
* Local variables:
* c-basic-offset: 8