From eee543e8248150e8fb833943c71f40c7b1724600 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 5 Oct 2012 22:23:51 +0200 Subject: i2c-mux: Add support for device auto-detection Let I2C bus segments behind multiplexers have a class. This allows for device auto-detection on these segments. As long as parent segments don't share the same class, it should be fine. I implemented support in drivers i2c-mux-gpio and i2c-mux-pca954x. I left i2c-mux-pca9541 and i2c-mux-pinctrl alone for the moment as I don't know if this feature makes sense for the use cases of these drivers. Signed-off-by: Jean Delvare Cc: Peter Korsgaard Cc: David Daney Cc: Michael Lawnick Cc: Rodolfo Giometti --- drivers/i2c/muxes/i2c-mux-pca954x.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'drivers/i2c/muxes/i2c-mux-pca954x.c') diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index f2dfe0d8fcc..8e4387235b6 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -186,7 +186,7 @@ static int pca954x_probe(struct i2c_client *client, { struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent); struct pca954x_platform_data *pdata = client->dev.platform_data; - int num, force; + int num, force, class; struct pca954x *data; int ret = -ENODEV; @@ -216,18 +216,20 @@ static int pca954x_probe(struct i2c_client *client, /* Now create an adapter for each channel */ for (num = 0; num < chips[data->type].nchans; num++) { force = 0; /* dynamic adap number */ + class = 0; /* no class by default */ if (pdata) { - if (num < pdata->num_modes) + if (num < pdata->num_modes) { /* force static number */ force = pdata->modes[num].adap_id; - else + class = pdata->modes[num].class; + } else /* discard unconfigured channels */ break; } data->virt_adaps[num] = i2c_add_mux_adapter(adap, &client->dev, client, - force, num, pca954x_select_chan, + force, num, class, pca954x_select_chan, (pdata && pdata->modes[num].deselect_on_exit) ? pca954x_deselect_mux : NULL); -- cgit v1.2.3-70-g09d2