- ssize_t spi_w8r16(struct spi_device * spi, u8 cmd);
- device with which data will be exchanged
- command to be written before data is read back
This returns the (unsigned) sixteen bit number returned by the device, or else a negative error code. Callable only from contexts that can sleep.
The number is returned in wire-order, which is at least sometimes big-endian.