'\" t
.\"     Title: spi_w8r8
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Serial Peripheral Interface (SPI)
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "SPI_W8R8" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Serial Peripheral Interface (S"
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.SH "NAME"
spi_w8r8 \- SPI synchronous 8 bit write followed by 8 bit read
.SH "SYNOPSIS"
.HP \w'ssize_t\ spi_w8r8('u
.BI "ssize_t spi_w8r8(struct\ spi_device\ *\ " "spi" ", u8\ " "cmd" ");"
.SH "ARGUMENTS"
.PP
\fIspi\fR
.RS 4
device with which data will be exchanged
.RE
.PP
\fIcmd\fR
.RS 4
command to be written before data is read back
.RE
.SH "CONTEXT"
.PP
can sleep
.SH "DESCRIPTION"
.PP
This returns the (unsigned) eight bit number returned by the device, or else a negative error code\&. Callable only from contexts that can sleep\&.
.SH "COPYRIGHT"
.br