'\" t
.\"     Title: spi_w8r8
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Serial Peripheral Interface (SPI)
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "SPI_W8R8" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Serial Peripheral Interface (S"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.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
Callable only from contexts that can sleep\&.
.SH "RETURN"
.PP
the (unsigned) eight bit number returned by the device, or else a negative error code\&.
.SH "COPYRIGHT"
.br