Input: wm97xx - mark channels which need pen_down

Currently, battery drivers also use poll_sample() provided by the
wm97xx-core but this code always checks if the pen is down. Mark the
channels which really need this (i.e. for the touchscreen) with the
PEN_DOWN bit, and skip the checks otherwise. Now, the battery channels
can always be read.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/input/touchscreen/wm9712.c b/drivers/input/touchscreen/wm9712.c
index d26093f479d..6e743e3dfda 100644
--- a/drivers/input/touchscreen/wm9712.c
+++ b/drivers/input/touchscreen/wm9712.c
@@ -255,8 +255,9 @@ static inline int is_pden(struct wm97xx *wm)
 static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
 {
         int timeout = 5 * delay;
+        bool wants_pen = adcsel & WM97XX_PEN_DOWN;
 
-        if (!wm->pen_probably_down) {
+        if (wants_pen && !wm->pen_probably_down) {
                 u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
                 if (!(data & WM97XX_PEN_DOWN))
                         return RC_PENUP;
@@ -300,7 +301,7 @@ static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
                 return RC_PENUP;
         }
 
-        if (!(*sample & WM97XX_PEN_DOWN)) {
+        if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
                 wm->pen_probably_down = 0;
                 return RC_PENUP;
         }
@@ -385,16 +386,18 @@ static int wm9712_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
                 if (rc != RC_VALID)
                         return rc;
         } else {
-                rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X, &data->x);
+                rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN,
+                                        &data->x);
                 if (rc != RC_VALID)
                         return rc;
 
-                rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y);
+                rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN,
+                                        &data->y);
                 if (rc != RC_VALID)
                         return rc;
 
                 if (pil && !five_wire) {
-                        rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES,
+                        rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
                                                 &data->p);
                         if (rc != RC_VALID)
                                 return rc;