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Input: atmel_tsadcc - improve accuracy

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Discard the last sample just before pen is up because it is quite often
errorneous.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Liang <dan.liang@atmel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dan Liang 2008-08-14 22:36:41 -04:00 committed by Dmitry Torokhov
parent 160f1fef7e
commit d8c1f317d1
1 changed files with 22 additions and 11 deletions
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33
drivers/input/touchscreen/atmel_tsadcc.c
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@ -91,6 +91,9 @@ struct atmel_tsadcc {
char phys[32];
struct clk *clk;
int irq;
unsigned int prev_absx;
unsigned int prev_absy;
unsigned char bufferedmeasure;
};
static void __iomem *tsc_base;
@ -100,10 +103,9 @@ static void __iomem *tsc_base;
static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
{
struct input_dev *input_dev = ((struct atmel_tsadcc *)dev)->input;
struct atmel_tsadcc *ts_dev = (struct atmel_tsadcc *)dev;
struct input_dev *input_dev = ts_dev->input;
unsigned int absx;
unsigned int absy;
unsigned int status;
unsigned int reg;
@ -121,6 +123,7 @@ static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
input_report_key(input_dev, BTN_TOUCH, 0);
ts_dev->bufferedmeasure = 0;
input_sync(input_dev);
} else if (status & ATMEL_TSADCC_PENCNT) {
@ -138,16 +141,23 @@ static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
} else if (status & ATMEL_TSADCC_EOC(3)) {
/* Conversion finished */
absx = atmel_tsadcc_read(ATMEL_TSADCC_CDR3) << 10;
absx /= atmel_tsadcc_read(ATMEL_TSADCC_CDR2);
if (ts_dev->bufferedmeasure) {
/* Last measurement is always discarded, since it can
* be erroneous.
* Always report previous measurement */
input_report_abs(input_dev, ABS_X, ts_dev->prev_absx);
input_report_abs(input_dev, ABS_Y, ts_dev->prev_absy);
input_report_key(input_dev, BTN_TOUCH, 1);
input_sync(input_dev);
} else
ts_dev->bufferedmeasure = 1;
absy = atmel_tsadcc_read(ATMEL_TSADCC_CDR1) << 10;
absy /= atmel_tsadcc_read(ATMEL_TSADCC_CDR0);
/* Now make new measurement */
ts_dev->prev_absx = atmel_tsadcc_read(ATMEL_TSADCC_CDR3) << 10;
ts_dev->prev_absx /= atmel_tsadcc_read(ATMEL_TSADCC_CDR2);
input_report_abs(input_dev, ABS_X, absx);
input_report_abs(input_dev, ABS_Y, absy);
input_report_key(input_dev, BTN_TOUCH, 1);
input_sync(input_dev);
ts_dev->prev_absy = atmel_tsadcc_read(ATMEL_TSADCC_CDR1) << 10;
ts_dev->prev_absy /= atmel_tsadcc_read(ATMEL_TSADCC_CDR0);
}
return IRQ_HANDLED;
@ -223,6 +233,7 @@ static int __devinit atmel_tsadcc_probe(struct platform_device *pdev)
}
ts_dev->input = input_dev;
ts_dev->bufferedmeasure = 0;
snprintf(ts_dev->phys, sizeof(ts_dev->phys),
"%s/input0", pdev->dev.bus_id);