Input: ads7846 - introduce sample settling delay

The ads7846 driver has support for filtering, but when the chip gets
deselected between samples this causes noise. This patch adds support
for an optional settling delay time, so that two consecutive samples
will be taken with the specified delay time apart.  This ensures that
the chip won't be deselected, so the noise won't appear.

Filtering can still be done, but will have less work to do since each
time a new sample is taken the same delay applies.

Signed-off-by: Semih Hazar <semih.hazar@indefia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 64 insertions, 1 deletions

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 1c9069c..103ee6a 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -95,7 +95,7 @@ struct ads7846 {
 	u16			dummy;		/* for the pwrdown read */
 	struct ts_event		tc;
 
-	struct spi_transfer	xfer[10];
+	struct spi_transfer	xfer[18];
 	struct spi_message	msg[5];
 	struct spi_message	*last_msg;
 	int			msg_idx;
@@ -936,6 +936,24 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 	x->len = 2;
 	spi_message_add_tail(x, m);
 
+	/* the first sample after switching drivers can be low quality;
+	 * optionally discard it, using a second one after the signals
+	 * have had enough time to stabilize.
+	 */
+	if (pdata->settle_delay_usecs) {
+		x->delay_usecs = pdata->settle_delay_usecs;
+
+		x++;
+		x->tx_buf = &ts->read_y;
+		x->len = 1;
+		spi_message_add_tail(x, m);
+
+		x++;
+		x->rx_buf = &ts->tc.y;
+		x->len = 2;
+		spi_message_add_tail(x, m);
+	}
+
 	m->complete = ads7846_rx_val;
 	m->context = ts;
 
@@ -954,6 +972,21 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 	x->len = 2;
 	spi_message_add_tail(x, m);
 
+	/* ... maybe discard first sample ... */
+	if (pdata->settle_delay_usecs) {
+		x->delay_usecs = pdata->settle_delay_usecs;
+
+		x++;
+		x->tx_buf = &ts->read_x;
+		x->len = 1;
+		spi_message_add_tail(x, m);
+
+		x++;
+		x->rx_buf = &ts->tc.x;
+		x->len = 2;
+		spi_message_add_tail(x, m);
+	}
+
 	m->complete = ads7846_rx_val;
 	m->context = ts;
 
@@ -973,6 +1006,21 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 		x->len = 2;
 		spi_message_add_tail(x, m);
 
+		/* ... maybe discard first sample ... */
+		if (pdata->settle_delay_usecs) {
+			x->delay_usecs = pdata->settle_delay_usecs;
+
+			x++;
+			x->tx_buf = &ts->read_z1;
+			x->len = 1;
+			spi_message_add_tail(x, m);
+
+			x++;
+			x->rx_buf = &ts->tc.z1;
+			x->len = 2;
+			spi_message_add_tail(x, m);
+		}
+
 		m->complete = ads7846_rx_val;
 		m->context = ts;
 
@@ -990,6 +1038,21 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 		x->len = 2;
 		spi_message_add_tail(x, m);
 
+		/* ... maybe discard first sample ... */
+		if (pdata->settle_delay_usecs) {
+			x->delay_usecs = pdata->settle_delay_usecs;
+
+			x++;
+			x->tx_buf = &ts->read_z2;
+			x->len = 1;
+			spi_message_add_tail(x, m);
+
+			x++;
+			x->rx_buf = &ts->tc.z2;
+			x->len = 2;
+			spi_message_add_tail(x, m);
+		}
+
 		m->complete = ads7846_rx_val;
 		m->context = ts;
 	}