hdpvr_i2c_read
retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0,
retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len,
hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);