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drivers
pps
clients
pps-ktimer.c
Go to the documentation of this file.
1
/*
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* pps-ktimer.c -- kernel timer test client
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*
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*
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* Copyright (C) 2005-2006 Rodolfo Giometti <
[email protected]
>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
19
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <
linux/init.h
>
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#include <linux/time.h>
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#include <
linux/timer.h
>
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#include <
linux/pps_kernel.h
>
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/*
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* Global variables
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*/
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static
struct
pps_device
*pps;
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static
struct
timer_list
ktimer;
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/*
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* The kernel timer
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*/
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static
void
pps_ktimer_event(
unsigned
long
ptr
)
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{
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struct
pps_event_time
ts
;
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/* First of all we get the time stamp... */
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pps_get_ts(&
ts
);
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pps_event
(pps, &
ts
,
PPS_CAPTUREASSERT
,
NULL
);
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mod_timer
(&ktimer, jiffies +
HZ
);
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}
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/*
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* The PPS info struct
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*/
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static
struct
pps_source_info
pps_ktimer_info = {
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.name =
"ktimer"
,
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.path =
""
,
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.mode =
PPS_CAPTUREASSERT
|
PPS_OFFSETASSERT
|
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PPS_ECHOASSERT
|
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PPS_CANWAIT
|
PPS_TSFMT_TSPEC
,
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.owner =
THIS_MODULE
,
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};
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/*
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* Module staff
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*/
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static
void
__exit
pps_ktimer_exit(
void
)
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{
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dev_info
(pps->
dev
,
"ktimer PPS source unregistered\n"
);
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del_timer_sync
(&ktimer);
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pps_unregister_source
(pps);
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}
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static
int
__init
pps_ktimer_init(
void
)
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{
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pps =
pps_register_source
(&pps_ktimer_info,
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PPS_CAPTUREASSERT
|
PPS_OFFSETASSERT
);
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if
(pps ==
NULL
) {
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pr_err
(
"cannot register PPS source\n"
);
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return
-
ENOMEM
;
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}
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setup_timer
(&ktimer, pps_ktimer_event, 0);
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mod_timer
(&ktimer, jiffies +
HZ
);
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dev_info
(pps->
dev
,
"ktimer PPS source registered\n"
);
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return
0;
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}
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module_init
(pps_ktimer_init);
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module_exit
(pps_ktimer_exit);
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MODULE_AUTHOR
(
"Rodolfo Giometti <
[email protected]
>"
);
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MODULE_DESCRIPTION
(
"dummy PPS source by using a kernel timer (just for debug)"
);
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MODULE_LICENSE
(
"GPL"
);
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