linux-kernel - Re: [PATCH v6 04/11] iio: accel: adxl345: set the tap suppress bit permanently

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Message-ID: <20250418191413.4a0a873e@jic23-huawei>
Date: Fri, 18 Apr 2025 19:14:13 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Lothar Rubusch <l.rubusch@...il.com>
Cc: lars@...afoo.de, Michael.Hennerich@...log.com,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 eraretuya@...il.com
Subject: Re: [PATCH v6 04/11] iio: accel: adxl345: set the tap suppress bit
 permanently

On Mon, 14 Apr 2025 18:42:38 +0000
Lothar Rubusch <l.rubusch@...il.com> wrote:

> Set the suppress bit feature to the double tap detection, whenever
> double tap is enabled. This impedes the suppress bit dangling in any
> state, and thus varying in sensitivity for double tap detection.
> 
> Any tap event is defined by a rising signal edge above threshold, i.e.
> duration time starts counting; and the falling edge under threshold
> within duration time, i.e. then the tap event is issued. This means
> duration is used individually for each tap event.
> 
> For double tap detection after a single tap, a latency time needs to be
> specified. Usually tap events, i.e. spikes above and returning below
> threshold will be ignored within latency. After latency, the window
> time starts counting for a second tap detection which has to happen
> within a duration time.
> 
> If the suppress bit is not set, spikes within latency time are ignored.
> Setting the suppress bit will invalidate the double tap function. The
> sensor will thus be able to save the window time for double tap
> detection, and follow a more strict definition of what signal qualifies
> for a double tap.
> 
> In a summary having the suppress bit set, fewer signal spikes will be
> considered as double taps. This is an optional add on to double tap,
> thus a separate patch.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
Applied 1-4.

Thanks,
Jonathan