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Input: ad7877 - implement EV_KEY:BTN_TOUCH reporting

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Some input users such as Android or X require BTN_TOUCH events.
Implement EV_KEY:BTN_TOUCH and make sure that the release event
is not erroneous scheduled without a preceding valid touch.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Michael Hennerich 2010-10-15 09:49:07 -07:00 committed by Dmitry Torokhov
parent e92c27fb53
commit 47026b25fc
1 changed files with 12 additions and 5 deletions
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17
drivers/input/touchscreen/ad7877.c
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@ -333,7 +333,7 @@ static int ad7877_read_adc(struct spi_device *spi, unsigned command)
return status ? : sample;
}
static void ad7877_rx(struct ad7877 *ts)
static int ad7877_rx(struct ad7877 *ts)
{
struct input_dev *input_dev = ts->input;
unsigned Rt;
@ -360,11 +360,17 @@ static void ad7877_rx(struct ad7877 *ts)
Rt /= z1;
Rt = (Rt + 2047) >> 12;
if (!timer_pending(&ts->timer))
input_report_key(input_dev, BTN_TOUCH, 1);
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;
}
return -EINVAL;
}
static inline void ad7877_ts_event_release(struct ad7877 *ts)
@ -372,6 +378,7 @@ static inline void ad7877_ts_event_release(struct ad7877 *ts)
struct input_dev *input_dev = ts->input;
input_report_abs(input_dev, ABS_PRESSURE, 0);
input_report_key(input_dev, BTN_TOUCH, 0);
input_sync(input_dev);
}
@ -413,11 +420,9 @@ static void ad7877_callback(void *_ts)
struct ad7877 *ts = _ts;
spin_lock_irq(&ts->lock);
ad7877_rx(ts);
ts->pending = 0;
if (!ad7877_rx(ts))
mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
ts->pending = 0;
spin_unlock_irq(&ts->lock);
}
@ -728,6 +733,8 @@ static int __devinit ad7877_probe(struct spi_device *spi)
input_dev->phys = ts->phys;
input_dev->dev.parent = &spi->dev;
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(BTN_TOUCH, input_dev->keybit);
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(ABS_X, input_dev->absbit);
__set_bit(ABS_Y, input_dev->absbit);