On Fri, Oct 02, 2015 at 12:27:16PM +0300, Jarkko Nikula wrote: > On 10/01/2015 11:37 PM, Wolfram Sang wrote: > > > >>This is for discussion so I didn't cc sta...@vger.kernel.org yet. I was > >>thinking would it work if we'd keep the stable name but have an another > >>symlink in /sys/bus/i2c/devices/ that uses "x-00yz" name. However this > >>feels ill-use of devices directory and probably causes more troubles > >>elsewhere. > > > >Do you foresee troubles already? I am still in favour of a symlink. > > > I haven't looked at this for a while but one problem was that devices/ > directory belongs to private structure of struct bus_type and in order to > create a symlink there it needs to done in drivers/base/bus.c: > bus_add_device() which felt quite hackish to me.
This is just a quick prototype and untested; but I did something similar
in the i2c-mux code:
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5f89f1e3c2f24f..715dca57ba68fd 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -970,13 +970,15 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
{
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
- if (adev) {
- dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev));
- return;
- }
-
dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap),
i2c_encode_flags_to_addr(client));
+
+ if (adev) {
+ char symlink_name[256];
+
+ snprintf(symlink_name, sizeof(symlink_name), "i2c-%s",
acpi_dev_name(adev));
+ sysfs_create_link(&client->dev.kobj, &adap->dev.kobj,
symlink_name);
+ }
}
/**
Shouldn't something like this be enough?
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