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| author | Gerlando Falauto <gerlando.falauto@keymile.com> | 2014-11-13 14:39:56 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-11-18 16:09:49 +0100 |
| commit | c9449affad2ae0824927df5a207705e07f346fb1 (patch) | |
| tree | e1ca67535ca757925c0a73a65230145070e4a92c /drivers/i2c | |
| parent | 51cf3b0e2a72bb08cd280be6c0ead4e08ed50a2c (diff) | |
| download | linux-rpi3-c9449affad2ae0824927df5a207705e07f346fb1.tar.gz linux-rpi3-c9449affad2ae0824927df5a207705e07f346fb1.tar.bz2 linux-rpi3-c9449affad2ae0824927df5a207705e07f346fb1.zip | |
i2c: mux: create "channel-n" symlinks for child segments in the mux device
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-mux.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c index f246a9f7dd22..593f7ca9adc7 100644 --- a/drivers/i2c/i2c-mux.c +++ b/drivers/i2c/i2c-mux.c @@ -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); |