An I2C driver that supports both OF and legacy platforms, will have both a OF and I2C ID table. This means that when built as a module, the aliases will be filled from both tables but currently always an alias of the form i2c:<deviceId> is reported, e.g: $ cat /sys/class/i2c-adapter/i2c-8/8-004b/modalias i2c:maxtouch So if a device is probed by matching its compatible string, udev can get a MODALIAS uevent env var that doesn't match with one of the valid aliases so the module won't be auto-loaded by libkmod/modprobe. This patch reports OF related uevent env vars (OF_COMPATIBLE) and also so the module can be auto-loaded report the correct alias using sysfs: $ cat /sys/class/i2c-adapter/i2c-8/8-004b/modalias of:NtrackpadT<NULL>Catmel,maxtouch Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> --- Hello, I'm posting this patch as an RFC because it will regress module auto loading for all I2C drivers that were relying on the old behavior of using the i2c:<deviceId> alias. This means drivers that doesn't have an OF table of that are not using the MOD_DEVICE_TABLE(of,...) macro. Best regards, Javier drivers/i2c/i2c-core.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 632057a..ec13c7e 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -122,6 +122,10 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) struct i2c_client *client = to_i2c_client(dev); int rc; + rc = of_device_uevent_modalias(dev, env); + if (rc != -ENODEV) + return rc; + rc = acpi_device_uevent_modalias(dev, env); if (rc != -ENODEV) return rc; @@ -431,6 +435,10 @@ show_modalias(struct device *dev, struct device_attribute *attr, char *buf) struct i2c_client *client = to_i2c_client(dev); int len; + len = of_device_get_modalias(dev, buf, PAGE_SIZE - 1); + if (len != -ENODEV) + return len; + len = acpi_device_modalias(dev, buf, PAGE_SIZE -1); if (len != -ENODEV) return len; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
