For instance, by adding a pca9547 device with address 0x70 to
bus i2c-0, you get
/sys/class/i2c-dev/i2c-0/device/0-0070/channel-0 -> i2c-1
...
/sys/class/i2c-dev/i2c-0/device/0-0070/channel-7 -> i2c-8
Signed-off-by: Gerlando Falauto <gerlando.falauto@xxxxxxxxxxx>
---
drivers/i2c/i2c-mux.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 01b8f8e..c984862 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -96,6 +96,7 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
{
struct i2c_mux_priv *priv;
int ret;
+ char symlink_name[12];
priv = kzalloc(sizeof(struct i2c_mux_priv), GFP_KERNEL);
if (!priv)
@@ -142,6 +143,17 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
dev_info(&parent->dev, "Added multiplexed i2c bus %d\n",
i2c_adapter_id(&priv->adap));
+ snprintf(symlink_name, sizeof(symlink_name), "channel-%d", chan_id);
+ ret = sysfs_create_link(&parent_device->kobj,
+ &priv->adap.dev.kobj,
+ symlink_name);
+ if (ret)
+ dev_err(parent_device, "Failed creating symlink %s\n",
+ symlink_name);
+ else
+ dev_info(parent_device, "Created symlink %s\n",
+ symlink_name);
+
return &priv->adap;
}
EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);
@@ -150,6 +162,11 @@ int i2c_del_mux_adapter(struct i2c_adapter *adap)
{
struct i2c_mux_priv *priv = adap->algo_data;
int ret;
+ char symlink_name[12];
+
+ snprintf(symlink_name, sizeof(symlink_name), "channel-%d", priv->chan_id);
+
+ sysfs_delete_link(&adap->dev.parent->kobj, &priv->adap.dev.kobj, symlink_name);
ret = i2c_del_adapter(adap);
if (ret < 0)
--
1.7.10.1
--
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