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i2c: mux: create symlink to actual mux device 

The current implementation creates muxed i2c-<n> busses as immediate
children of their i2c-<n> parent bus. In case of multiple muxes on one
bus, it is impossible to determine which muxed bus comes from which mux.

It could be argued that the parent device should be changed from the
parent adapter to the mux device. This has pros and cons. To improve the
topology, simply add a "mux_device" symlink pointing to the actual
muxing device, so we can distinguish muxed busses. Doing it this way, we
don't break the ABI.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Wolfram Sang 2014-11-13 14:39:55 +01:00
parent 4470c725ba
commit 51cf3b0e2a
1 changed files with 4 additions and 0 deletions
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4
drivers/i2c/i2c-mux.c
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@ -183,6 +183,9 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
return NULL; return NULL;
} }
WARN(sysfs_create_link(&priv->adap.dev.kobj, &mux_dev->kobj, "mux_device"),
"can't create symlink to mux device\n");
dev_info(&parent->dev, "Added multiplexed i2c bus %d\n", dev_info(&parent->dev, "Added multiplexed i2c bus %d\n",
i2c_adapter_id(&priv->adap)); i2c_adapter_id(&priv->adap));
@ -194,6 +197,7 @@ void i2c_del_mux_adapter(struct i2c_adapter *adap)
{ {
struct i2c_mux_priv *priv = adap->algo_data; struct i2c_mux_priv *priv = adap->algo_data;
sysfs_remove_link(&priv->adap.dev.kobj, "mux_device");
i2c_del_adapter(adap); i2c_del_adapter(adap);
kfree(priv); kfree(priv);
} }