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@@ -107,6 +107,8 @@ struct ads7846 {
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u16 debounce_tol;
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u16 debounce_rep;
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+ u16 penirq_recheck_delay_usecs;
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+
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spinlock_t lock;
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struct hrtimer timer;
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unsigned pendown:1; /* P: lock */
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@@ -553,6 +555,15 @@ static void ads7846_rx(void *ads)
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return;
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}
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+ /* Maybe check the pendown state before reporting. This discards
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+ * false readings when the pen is lifted.
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+ */
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+ if (ts->penirq_recheck_delay_usecs) {
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+ udelay(ts->penirq_recheck_delay_usecs);
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+ if (!ts->get_pendown_state())
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+ Rt = 0;
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+ }
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+
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/* NOTE: We can't rely on the pressure to determine the pen down
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* state, even this controller has a pressure sensor. The pressure
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* value can fluctuate for quite a while after lifting the pen and
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@@ -896,6 +907,10 @@ static int __devinit ads7846_probe(struct spi_device *spi)
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ts->filter = ads7846_no_filter;
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ts->get_pendown_state = pdata->get_pendown_state;
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+ if (pdata->penirq_recheck_delay_usecs)
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+ ts->penirq_recheck_delay_usecs =
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+ pdata->penirq_recheck_delay_usecs;
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+
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snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id);
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input_dev->name = "ADS784x Touchscreen";
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