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Date: Wed, 15 Feb 2017 17:31:08 +0300 From: Andrey Drobyshev <immortalguardian1@...il.com> To: linux-kernel@...r.kernel.org Cc: gq@...msu.su, giometti@...eenne.com Subject: [PATCH 7/8] LinuxPPS: pps_gen_parport: Add polarity parameter for inverted signal. From: Alexander GQ Gerasiov <gq@...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@...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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