The first mux/switch port would not get selected if it was the first port to be accessed because the code believed it already had. We now initialize the last channel to a bogus value to ensure the first access will properly select the channel. Signed-off-by: Kumar Gala <galak at kernel.crashing.org> --- commit 9040559b19987489000a75a5f8b4957ecbb0fa7f tree 63056d09c30f32b71bf0a2a3d57a42c2380a9dd8 parent c2f0d4dc88921bb6bed9e289fbda132f587a4306 author Kumar Gala <galak at kernel.crashing.org> Tue, 25 Apr 2006 11:58:51 -0500 committer Kumar Gala <galak at kernel.crashing.org> Tue, 25 Apr 2006 11:58:51 -0500 drivers/i2c/chips/pca954x.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/chips/pca954x.c b/drivers/i2c/chips/pca954x.c index f300493..4ee38bc 100644 --- a/drivers/i2c/chips/pca954x.c +++ b/drivers/i2c/chips/pca954x.c @@ -234,6 +234,10 @@ static int pca954x_detect(struct i2c_ada data->chip_offset = i; + /* Set last_chan to an invalid channel to force an initial setting + * of the mux/switch on the first select_chan */ + data->last_chan = 0xff; + if ((ret = i2c_attach_client(client))) goto exit_free;
