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fix bug in xpt2046_ts.c, move ahead data discard.

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The configuration for XPT2046 TS driver with CALIBRATION is "XPT2046 based touchscreens: XPT2046 SPI Interface".
In this modification,  the first raw data is discarded before processed, so that it can work on IT50.
This commit is contained in:
Rich.jiangyk
2010-09-19 19:49:54 +08:00
parent fbb07241ef
commit c1c8e506a9
1 changed files with 10 additions and 1 deletions
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11
drivers/input/touchscreen/xpt2046_ts.c
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@@ -394,6 +394,14 @@ static int xpt2046_debounce(void *xpt, int data_idx, int *val)
abs(ts->last_read - *val),ts->debounce_tol,
ts->read_rep,ts->debounce_rep);
/* discard the first sample. */
//on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
if(!ts->read_cnt)
{
//udelay(100);
ts->read_cnt++;
return XPT2046_FILTER_REPEAT;
}
if(*val == 4095 || *val == 0)
{
ts->read_cnt = 0;
@@ -403,11 +411,12 @@ static int xpt2046_debounce(void *xpt, int data_idx, int *val)
return XPT2046_FILTER_IGNORE;
}
/* discard the first sample. */
if(!ts->read_cnt)
/* if(!ts->read_cnt)
{
ts->read_cnt++;
return XPT2046_FILTER_REPEAT;
}
move discard ahead */
if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
/* Start over collecting consistent readings. */