fix boards for kernels with algo_control

From: Mauro Carvalho Chehab <mchehab@redhat.com>

changeset 4ecae6da8244 removed algo_control from i2c drivers. However,
on older kernels, a dummy function to implement algo_control is required,
otherwise, an OOPS is generated.

This patch adds a backport for all i2c drivers that defines an
i2c_algorithm, except for cafe_ccic, since OLPC hardware only works
for kernels newer than 2.6.19.

Some of the backported drivers would need also extra changes to work with
older kernels, as specified on v4l/versions.txt. Yet, I decided to add
the backport for those drivers also, since the lack of algo_control doesn't
generate any compilation error, but it is enough to break the driver. So,
better to all for all boards than to allow compiling a kernel backported that
just generates OOPS.

Priority: normal

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/linux/drivers/media/video/bt8xx/bttv-i2c.c b/linux/drivers/media/video/bt8xx/bttv-i2c.c
index bcd2cd240..558572589 100644
--- a/linux/drivers/media/video/bt8xx/bttv-i2c.c
+++ b/linux/drivers/media/video/bt8xx/bttv-i2c.c
@@ -260,6 +260,9 @@ static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int
 static const struct i2c_algorithm bttv_algo = {
 	.master_xfer   = bttv_i2c_xfer,
 	.functionality = functionality,
+#ifdef NEED_ALGO_CONTROL
+	.algo_control = dummy_algo_control,
+#endif
 };
 
 /* ----------------------------------------------------------------------- */