K97 项目相关修改

[firefly-linux-kernel-4.4.55.git] / drivers / input / touchscreen / ad7879.c

diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c
index ba6f0bd1e762e494961f6eab23204fb37eff63c0..bc3b5187f3a391504f275567d7143e878dda5c9b 100644 (file)
--- a/drivers/input/touchscreen/ad7879.c
+++ b/drivers/input/touchscreen/ad7879.c
@@ -129,6 +129,9 @@ struct ad7879 {
        u16                     cmd_crtl1;
        u16                     cmd_crtl2;
        u16                     cmd_crtl3;
+       int                     x;
+       int                     y;
+       int                     Rt;
 };
 
 static int ad7879_read(struct ad7879 *ts, u8 reg)
@@ -175,13 +178,32 @@ static int ad7879_report(struct ad7879 *ts)
                Rt /= z1;
                Rt = (Rt + 2047) >> 12;
 
-               if (!timer_pending(&ts->timer))
+               /*
+                * Sample found inconsistent, pressure is beyond
+                * the maximum. Don't report it to user space.
+                */
+               if (Rt > ts->pressure_max)
+                       return -EINVAL;
+
+               /*
+                * Note that we delay reporting events by one sample.
+                * This is done to avoid reporting last sample of the
+                * touch sequence, which may be incomplete if finger
+                * leaves the surface before last reading is taken.
+                */
+               if (timer_pending(&ts->timer)) {
+                       /* Touch continues */
                        input_report_key(input_dev, BTN_TOUCH, 1);
+                       input_report_abs(input_dev, ABS_X, ts->x);
+                       input_report_abs(input_dev, ABS_Y, ts->y);
+                       input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
+                       input_sync(input_dev);
+               }
+
+               ts->x = x;
+               ts->y = y;
+               ts->Rt = Rt;
 
-               input_report_abs(input_dev, ABS_X, x);
-               input_report_abs(input_dev, ABS_Y, y);
-               input_report_abs(input_dev, ABS_PRESSURE, Rt);
-               input_sync(input_dev);
                return 0;
        }