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Groups > linux.kernel > #1581363
| From | Andrey Drobyshev <immortalguardian1@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 7/8] LinuxPPS: pps_gen_parport: Add polarity parameter for inverted signal. |
| Date | 2017-02-15 15:40 +0100 |
| Message-ID | <tb8Uq-1ae-19@gated-at.bofh.it> (permalink) |
| References | <tb8Up-1ae-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Alexander GQ Gerasiov <gq@cs.msu.su> On some devices it may be necessary to transmit inverted data. This commit simply adds polarity parameter to define which state represents presence of signal: it equals 0 if signal is on the low level (default), or 1 if signal is on the high level (inverted signal). Signed-off-by: Alexander GQ Gerasiov <gq@cs.msu.su> --- drivers/pps/generators/pps_gen_parport.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/pps/generators/pps_gen_parport.c b/drivers/pps/generators/pps_gen_parport.c index dcd39fb..7739301 100644 --- a/drivers/pps/generators/pps_gen_parport.c +++ b/drivers/pps/generators/pps_gen_parport.c @@ -36,8 +36,8 @@ #define DRVDESC "parallel port PPS signal generator" -#define SIGNAL 0 -#define NO_SIGNAL PARPORT_CONTROL_STROBE +#define SIGNAL (polarity?PARPORT_CONTROL_STROBE:0) +#define NO_SIGNAL (polarity?0:PARPORT_CONTROL_STROBE) /* module parameters */ @@ -48,6 +48,10 @@ MODULE_PARM_DESC(delay, "Delay between setting and dropping the signal (ns)"); module_param_named(delay, send_delay, uint, 0); +static unsigned int polarity; +MODULE_PARM_DESC(polarity, + "Signal is on the low level (0 - default) or on the high level (1)."); +module_param(polarity, uint, 0); #define SAFETY_INTERVAL 3000 /* set the hrtimer earlier for safety (ns) */ -- 2.1.4
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[PATCH 0/8] LinuxPPS: some minor fixes and improvements. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 6/8] LinuxPPS: pps_parport: Ignore interrupt invoked less than 0.5sec after previous. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 2/8] ntp/pps: ignore pps_valid decreasing if there is no pps signal. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 8/8] LinuxPPS: pps_gen_parport: Add check for bad clocksource. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 4/8] LinuxPPS: kapi: Unlock before waking up events queue in pps_event(). Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 5/8] LinuxPPS: pps_parport: Do not generate assert in case of lost signal. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 7/8] LinuxPPS: pps_gen_parport: Add polarity parameter for inverted signal. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100 [PATCH 3/8] hardpps: fix some pps_jitter issues. Andrey Drobyshev <immortalguardian1@gmail.com> - 2017-02-15 15:40 +0100
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