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Input: ads7846 - optionally leave Vref on during differential measurements

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On some LCDs leaving the Vref on provides much better readings.

Signed-off-by: Jarkko Oikarinen <jarkko.oikarinen@nokia.com>
Signed-off-by: Imre Deak <imre.deak@solidboot.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Imre Deak
2007-01-18 00:45:21 -05:00
committed by Dmitry Torokhov
parent da970e69ef
commit de2defd96d
2 changed files with 19 additions and 13 deletions
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2
include/linux/spi/ads7846.h
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@@ -14,6 +14,8 @@ enum ads7846_filter {
struct ads7846_platform_data {
u16 model; /* 7843, 7845, 7846. */
u16 vref_delay_usecs; /* 0 for external vref; etc */
int keep_vref_on:1; /* set to keep vref on for differential
* measurements as well */
u16 x_plate_ohms;
u16 y_plate_ohms;