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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
131 lines
4.8 KiB
Diff
131 lines
4.8 KiB
Diff
From abe8f448547d1bd69ac2963e07e2657f27b79691 Mon Sep 17 00:00:00 2001
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From: I-Fan Chen <tick@openmoko.com>
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Date: Wed, 29 Oct 2008 03:15:18 +0000
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Subject: [PATCH] palliate_touch_screen_jitter.patch
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S3C24XX touchscreen: To palliate the data jitter from touchpanel
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Thanks to Dima Kogan patch eff39cde0d3cdd2afd5e1b4be5a8eb6cf195543e,
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in which try to balence the up/down events, and inspired this patch.
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We can observe a serious up/down jitter phenomenon when touching the touchscreen lightly.
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This only happens when the press pressure is pretty light:
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eg. large scale light touch,
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starting to touch,
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or going to move finger from touch panel.
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This will make user space library think it got extra click events.
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In order to palliate with this phenomenon, we delayed the up event for a while,
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and see if it is a jitter or not.
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The threshold is crucial. If it is too long, multiple clicks will be filtered out.
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If it is too short we did not filter anything out.
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From the log and some survey we can see that the interval of two clicks is generally over 0.1 sec.
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And Most jitter events happens in 0.3 sec.
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And the longest duration of vision is about 1/16 sec, and it's not easy for human to notice.
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So I choose 1/16 sec as the threshold.
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This filters out most (not all) jitter events, and preserves the normal behavior we expected.
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Signed-off-by: I-Fan Chen <tick@openmoko.com>
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---
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drivers/input/touchscreen/s3c2410_ts.c | 47 +++++++++++++++++---------------
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1 files changed, 25 insertions(+), 22 deletions(-)
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diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c
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index fc1c500..95672ff 100644
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--- a/drivers/input/touchscreen/s3c2410_ts.c
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+++ b/drivers/input/touchscreen/s3c2410_ts.c
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@@ -78,6 +78,12 @@
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#define DEBUG_LVL KERN_DEBUG
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+#define TOUCH_STANDBY_FLAG 0
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+#define TOUCH_PRESSED_FLAG 1
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+#define TOUCH_RELEASE_FLAG 2
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+
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+#define TOUCH_RELEASE_TIMEOUT (HZ >> 4)
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+
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MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
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MODULE_DESCRIPTION("s3c2410 touchscreen driver");
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MODULE_LICENSE("GPL");
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@@ -131,7 +137,7 @@ static void clear_raw_fifo(void)
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ts.raw_running_avg.x = 0;
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ts.raw_running_avg.y = 0;
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ts.flag_previous_exceeded_threshold = 0;
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- ts.flag_first_touch_sent = 0;
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+ ts.flag_first_touch_sent = TOUCH_STANDBY_FLAG;
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}
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@@ -143,6 +149,10 @@ static inline void s3c2410_ts_connect(void)
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s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
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}
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+static void touch_timer_fire(unsigned long data);
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+static struct timer_list touch_timer =
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+ TIMER_INITIALIZER(touch_timer_fire, 0, 0);
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+
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static void touch_timer_fire(unsigned long data)
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{
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unsigned long data0;
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@@ -155,18 +165,9 @@ static void touch_timer_fire(unsigned long data)
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updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) &&
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(!(data1 & S3C2410_ADCDAT0_UPDOWN));
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- // if we need to send an untouch event, but we haven't yet sent the
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- // touch event (this happens if the touchscreen was tapped lightly),
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- // send the touch event first
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- if (!updown && !ts.flag_first_touch_sent && ts.count != 0) {
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- input_report_abs(ts.dev, ABS_X, ts.xp >> ts.shift);
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- input_report_abs(ts.dev, ABS_Y, ts.yp >> ts.shift);
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-
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- input_report_key(ts.dev, BTN_TOUCH, 1);
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- input_report_abs(ts.dev, ABS_PRESSURE, 1);
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- input_sync(ts.dev);
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- ts.flag_first_touch_sent = 1;
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- }
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+ if ( updown && ts.flag_first_touch_sent == TOUCH_RELEASE_FLAG ) {
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+ ts.flag_first_touch_sent = TOUCH_PRESSED_FLAG;
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+ }
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if (updown) {
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if (ts.count != 0) {
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@@ -189,7 +190,7 @@ static void touch_timer_fire(unsigned long data)
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input_report_key(ts.dev, BTN_TOUCH, 1);
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input_report_abs(ts.dev, ABS_PRESSURE, 1);
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input_sync(ts.dev);
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- ts.flag_first_touch_sent = 1;
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+ ts.flag_first_touch_sent = TOUCH_PRESSED_FLAG;
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}
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ts.xp = 0;
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@@ -202,19 +203,21 @@ static void touch_timer_fire(unsigned long data)
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S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
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} else {
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ts.count = 0;
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-
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- input_report_key(ts.dev, BTN_TOUCH, 0);
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- input_report_abs(ts.dev, ABS_PRESSURE, 0);
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- input_sync(ts.dev);
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- ts.flag_first_touch_sent = 0;
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+
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+ if ( ts.flag_first_touch_sent == TOUCH_RELEASE_FLAG ) {
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+ input_report_key(ts.dev, BTN_TOUCH, 0);
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+ input_report_abs(ts.dev, ABS_PRESSURE, 0);
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+ input_sync(ts.dev);
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+ ts.flag_first_touch_sent = TOUCH_STANDBY_FLAG;
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+ } if ( ts.flag_first_touch_sent == TOUCH_PRESSED_FLAG ) {
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+ ts.flag_first_touch_sent = TOUCH_RELEASE_FLAG;
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+ mod_timer(&touch_timer, jiffies + TOUCH_RELEASE_TIMEOUT);
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+ }
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writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
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}
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}
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-static struct timer_list touch_timer =
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- TIMER_INITIALIZER(touch_timer_fire, 0, 0);
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-
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static irqreturn_t stylus_updown(int irq, void *dev_id)
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{
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unsigned long data0;
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--
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1.5.6.5
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