Input: ads7846 - simplify support of external vREF (and ads7843)

This updates the ads7846 driver to handle external vREF (required
on boards using ads7843 chips) without module parameters, and also
removes a needless variable with its associated bogus gcc warning.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index 334d31411629..daf744017a31 100644
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -14,7 +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
+        u16     vref_mv;                /* external vref value, milliVolts */
+        bool    keep_vref_on;           /* set to keep vref on for differential
                                          * measurements as well */
 
         /* Settling time of the analog signals; a function of Vcc and the