linux-kernel - Re: [PATCH 04/15] iio: adc: at91_adc: Add support for touchscreens without TSMR

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Date:	Sun, 16 Mar 2014 20:28:54 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH 04/15] iio: adc: at91_adc: Add support for touchscreens without TSMR



On March 16, 2014 7:16:39 PM GMT+00:00, Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:
>On 16/03/2014 at 18:16:54 +0000, Jonathan Cameron wrote :
>> On 05/03/14 17:35, Alexandre Belloni wrote:
>> >Old ADCs, as present on the sam9rl and the sam9g45 don't have a TSMR
>register
>> >and the touchscreen support should be handled differently.
>> >
>> >Signed-off-by: Alexandre Belloni
><alexandre.belloni@...e-electrons.com>
>> One comment inline about handling of devices where the platform data
>doesn't
>> include the touchscreen type.  I'd expect zero to be the current
>default
>> rather than NONE...
>> >diff --git a/include/linux/platform_data/at91_adc.h
>b/include/linux/platform_data/at91_adc.h
>> >index fcf73879dbfe..7819fc787731 100644
>> >--- a/include/linux/platform_data/at91_adc.h
>> >+++ b/include/linux/platform_data/at91_adc.h
>> >@@ -7,6 +7,12 @@
>> >  #ifndef _AT91_ADC_H_
>> >  #define _AT91_ADC_H_
>> >
>> >+enum atmel_adc_ts_type {
>> This means that the default for existing touch screens (where the
>platform
>> data won't include setting this value) will be none.  Is that
>correct?
>> >+	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
>> >+	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
>> >+	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
>> >+};
>> >+
>
>This is actually just a snippet that I moved from at91_adc.c to
>at91_adc.h. I followed the current behavior.  Until now, using the
>touchscreen was only supported through device tree and touchscreen
>handling was not activated unless the atmel,adc-ts-wires property is
>present.  I guess this is the sane way to go because when you use the
>touchscreen, you lose the triggers.
Ah. Thanks for clearing that up. I missed that it previously existed entirely..

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