'\" t
.\"     Title: ata_host_activate
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: libata Library
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "ATA_HOST_ACTIVATE" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "libata Library"
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.SH "NAME"
ata_host_activate \- start host, request IRQ and register it
.SH "SYNOPSIS"
.HP \w'int\ ata_host_activate('u
.BI "int ata_host_activate(struct\ ata_host\ *\ " "host" ", int\ " "irq" ", irq_handler_t\ " "irq_handler" ", unsigned\ long\ " "irq_flags" ", struct\ scsi_host_template\ *\ " "sht" ");"
.SH "ARGUMENTS"
.PP
\fIstruct ata_host * host\fR
.RS 4
target ATA host
.RE
.PP
\fIint irq\fR
.RS 4
IRQ to request
.RE
.PP
\fIirq_handler_t irq_handler\fR
.RS 4
irq_handler used when requesting IRQ
.RE
.PP
\fIunsigned long irq_flags\fR
.RS 4
irq_flags used when requesting IRQ
.RE
.PP
\fIstruct scsi_host_template * sht\fR
.RS 4
scsi_host_template to use when registering the host
.RE
.SH "DESCRIPTION"
.PP
After allocating an ATA host and initializing it, most libata LLDs perform three steps to activate the host \- start host, request IRQ and register it\&. This helper takes necessary arguments and performs the three steps in one go\&.
.PP
An invalid IRQ skips the IRQ registration and expects the host to have set polling mode on the port\&. In this case,
\fIirq_handler\fR
should be NULL\&.
.PP
LOCKING: Inherited from calling layer (may sleep)\&.
.SH "RETURN"
.PP
0 on success, \-errno otherwise\&.
.SH "AUTHOR"
.PP
\fBJeff Garzik\fR
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br