sendbytes
ret = sendbytes(i2c_adap, pmsg);
int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
return device->bus->ops->sendbytes(device, bytes, count);
.sendbytes = snd_i2c_bit_sendbytes,
.sendbytes = ap_cs8427_sendbytes,