MHZ19B_CMD_SIZE
ret = serdev_device_write(serdev, cmd_buf, MHZ19B_CMD_SIZE, 0);
if (ret != MHZ19B_CMD_SIZE)
if (st->buf_idx == MHZ19B_CMD_SIZE) {
u8 buf[MHZ19B_CMD_SIZE] __aligned(IIO_DMA_MINALIGN);
u8 cmd_buf[MHZ19B_CMD_SIZE] = {