linux-kernel - Re: [PATCH 7/8] LinuxPPS: pps_gen_parport: Add polarity parameter for inverted signal.

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Date:   Sat, 4 Mar 2017 08:42:26 +0100
From:   Rodolfo Giometti <giometti@...eenne.com>
To:     Andrey Drobyshev <immortalguardian1@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     gq@...msu.su
Subject: Re: [PATCH 7/8] LinuxPPS: pps_gen_parport: Add polarity parameter for
 inverted signal.

On 02/15/17 15:31, Andrey Drobyshev wrote:
> 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)

Add spaces:

> +#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) */

Acked-by: Rodolfo Giometti <giometti@...eenne.com>