tps6594_i2c_transfer
return tps6594_i2c_transfer(client->adapter, &msg, 1);
return tps6594_i2c_transfer(client->adapter, msgs, 2);
ret = tps6594_i2c_transfer(client->adapter, &msg, 1);
ret = tps6594_i2c_transfer(client->adapter, msgs, 2);