> +static u32 ljca_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C;
You could use this here to make the driver way more useful:
return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
Except I2C_FUNC_SMBUS_QUICK, emulated SMBUS calls work out of the box.
For I2C_FUNC_SMBUS_QUICK, you need to test zero-length transfers indeed
('i2cdetect <busnum>' will use it and is a good testcase). Which would
be good anyway, because if it is not supporting zero-length, we need to
add an adapter->quirk flag as well.
We could add this incrementally, but it will be better to have this
correct right away. i2cdetect is a good and simple testcase.
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