i2c: mux: create "channel-n" symlinks for child segments in the mux device (c9449aff) · Commits · 戴 / test

This makes the topology clearer. 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@keymile.com> [wsa: simplified sysfs-usage and fixed format string usage] Signed-off-by:

Wolfram Sang <wsa@the-dreams.de> Acked-by:

Martin Belanger <martin.belanger@cyaninc.com> Acked-by:

Danielle Costantino <danielle.costantino@gmail.com>

drivers/i2c/i2c-mux.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -110,6 +110,7 @@ struct i2c_adapter i2c_add_mux_adapter(struct i2c_adapter parent,
		void *, u32))
		{
		struct i2c_mux_priv *priv;
		char symlink_name[20];
		int ret;

		priv = kzalloc(sizeof(struct i2c_mux_priv), GFP_KERNEL);
		@@ -186,6 +187,9 @@ struct i2c_adapter i2c_add_mux_adapter(struct i2c_adapter parent,
		WARN(sysfs_create_link(&priv->adap.dev.kobj, &mux_dev->kobj, "mux_device"),
		"can't create symlink to mux device\n");

		snprintf(symlink_name, sizeof(symlink_name), "channel-%u", chan_id);
		WARN(sysfs_create_link(&mux_dev->kobj, &priv->adap.dev.kobj, symlink_name),
		"can't create symlink for channel %u\n", chan_id);
		dev_info(&parent->dev, "Added multiplexed i2c bus %d\n",
		i2c_adapter_id(&priv->adap));

		@@ -196,6 +200,10 @@ EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);
		void i2c_del_mux_adapter(struct i2c_adapter *adap)
		{
		struct i2c_mux_priv *priv = adap->algo_data;
		char symlink_name[20];

		snprintf(symlink_name, sizeof(symlink_name), "channel-%u", priv->chan_id);
		sysfs_remove_link(&adap->dev.parent->kobj, symlink_name);

		sysfs_remove_link(&priv->adap.dev.kobj, "mux_device");
		i2c_del_adapter(adap);

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