Input: ads7846 - add support for AD7843 parts

The AD7873 is almost identical to the ADS7846; the only difference is
related to the Power Management bits PD0 and PD1.  This results in a
slightly different PENIRQ enable behavior.  For the AD7873, VREF should
be turned off during differential measurements.

So, add the AD7873/43 to the list of driver supported devices, and prevent
VREF usage during differential/ratiometric conversion modes.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 7208654a94ae..8a8fa4d2d6a8 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -24,17 +24,18 @@ config TOUCHSCREEN_88PM860X
           module will be called 88pm860x-ts.
 
 config TOUCHSCREEN_ADS7846
-        tristate "ADS7846/TSC2046 and ADS7843 based touchscreens"
+        tristate "ADS7846/TSC2046/AD7873 and AD(S)7843 based touchscreens"
         depends on SPI_MASTER
         depends on HWMON = n || HWMON
         help
           Say Y here if you have a touchscreen interface using the
-          ADS7846/TSC2046 or ADS7843 controller, and your board-specific
-          setup code includes that in its table of SPI devices.
+          ADS7846/TSC2046/AD7873 or ADS7843/AD7843 controller,
+          and your board-specific setup code includes that in its
+          table of SPI devices.
 
           If HWMON is selected, and the driver is told the reference voltage
           on your board, you will also get hwmon interfaces for the voltage
-          (and on ads7846/tsc2046, temperature) sensors of this chip.
+          (and on ads7846/tsc2046/ad7873, temperature) sensors of this chip.
 
           If unsure, say N (but it's safe to say "Y").