You could also add a 
mv88e6xxx_port_led_read(chip, port, *reg)
{
	int err;

	err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_LED_CONTROL, reg);
	*reg &= 0x3ff;

	return err;

Actually, this wrong. You first need to write the register pointer
number you want to read:

 	err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_LED_CONTROL, ptr);
	if (err)
	   return err;

and then do a read, and mask the only the lower 10 bits, where the
register value will be:

 	err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_LED_CONTROL, val);
 	*val &= 0x3ff;
 
 	return err;

	Andrew