From 1d25891f3241103d14ea78236504474a138b8ada Mon Sep 17 00:00:00 2001 From: Semih Hazar Date: Wed, 18 Jul 2007 00:36:04 -0400 Subject: [PATCH] Input: ads7846 - re-check pendown status before reporting events Pendown status from the PENIRQ pin is currently read only at the beginning of a sample set. If the pen is lifted just after sampling has began then sampled values become wrong. This patch adds an optional platform penirq_recheck_delay attribute. If non-zero, samples are only reported to the input subsystem if PENIRQ is still active that long after the samples taken. Signed-off-by: Semih Hazar Signed-off-by: David Brownell Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/ads7846.c | 15 +++++++++++++++ include/linux/spi/ads7846.h | 6 ++++++ 2 files changed, 21 insertions(+) diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index 103ee6ad299..96581d08774 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -107,6 +107,8 @@ struct ads7846 { u16 debounce_tol; u16 debounce_rep; + u16 penirq_recheck_delay_usecs; + spinlock_t lock; struct hrtimer timer; unsigned pendown:1; /* P: lock */ @@ -553,6 +555,15 @@ static void ads7846_rx(void *ads) return; } + /* Maybe check the pendown state before reporting. This discards + * false readings when the pen is lifted. + */ + if (ts->penirq_recheck_delay_usecs) { + udelay(ts->penirq_recheck_delay_usecs); + if (!ts->get_pendown_state()) + Rt = 0; + } + /* NOTE: We can't rely on the pressure to determine the pen down * state, even this controller has a pressure sensor. The pressure * value can fluctuate for quite a while after lifting the pen and @@ -896,6 +907,10 @@ static int __devinit ads7846_probe(struct spi_device *spi) ts->filter = ads7846_no_filter; ts->get_pendown_state = pdata->get_pendown_state; + if (pdata->penirq_recheck_delay_usecs) + ts->penirq_recheck_delay_usecs = + pdata->penirq_recheck_delay_usecs; + snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id); input_dev->name = "ADS784x Touchscreen"; diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h index a44fa7a02bd..334d3141162 100644 --- a/include/linux/spi/ads7846.h +++ b/include/linux/spi/ads7846.h @@ -24,6 +24,12 @@ struct ads7846_platform_data { */ u16 settle_delay_usecs; + /* If set to non-zero, after samples are taken this delay is applied + * and penirq is rechecked, to help avoid false events. This value + * is affected by the material used to build the touch layer. + */ + u16 penirq_recheck_delay_usecs; + u16 x_plate_ohms; u16 y_plate_ohms; -- 2.20.1