SPI_W8R8(9)                       Serial Peripheral Interface (S                      SPI_W8R8(9)



NAME
       spi_w8r8 - SPI synchronous 8 bit write followed by 8 bit read

SYNOPSIS
       ssize_t spi_w8r8(struct spi_device * spi, u8 cmd);

ARGUMENTS
       spi
           device with which data will be exchanged

       cmd
           command to be written before data is read back

CONTEXT
       can sleep

DESCRIPTION
       Callable only from contexts that can sleep.

RETURN
       the (unsigned) eight bit number returned by the device, or else a negative error code.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                               SPI_W8R8(9)