[PATCH 360/641] Staging: dream: synaptics touchscreen for dream: documentation
Greg Kroah-Hartman
gregkh at suse.de
Tue Sep 15 19:09:51 UTC 2009
From: Pavel Machek <pavel at ucw.cz>
This adds pointer to hardware documentation, and adds code comment
from Arve.
Signed-off-by: Pavel Machek <pavel at ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
drivers/staging/dream/synaptics_i2c_rmi.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/dream/synaptics_i2c_rmi.c b/drivers/staging/dream/synaptics_i2c_rmi.c
index 6bc20d9..9190a9d 100644
--- a/drivers/staging/dream/synaptics_i2c_rmi.c
+++ b/drivers/staging/dream/synaptics_i2c_rmi.c
@@ -13,6 +13,7 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
+ * http://www.synaptics.com/sites/default/files/511_000099_01F.pdf
*/
#include <linux/module.h>
@@ -87,6 +88,22 @@ static int synaptics_init_panel(struct synaptics_ts_data *ts)
static void decode_report(struct synaptics_ts_data *ts, u8 *buf)
{
+/*
+ * This sensor sends two 6-byte absolute finger reports, an optional
+ * 2-byte relative report followed by a status byte. This function
+ * reads the two finger reports and transforms the coordinates
+ * according the platform data so they can be aligned with the lcd
+ * behind the touchscreen. Typically we flip the y-axis since the
+ * sensor uses the bottom left corner as the origin, but if the sensor
+ * is mounted upside down the platform data will request that the
+ * x-axis should be flipped instead. The snap to inactive edge border
+ * are used to allow tapping the edges of the screen on the G1. The
+ * active area of the touchscreen is smaller than the lcd. When the
+ * finger gets close the edge of the screen we snap it to the
+ * edge. This allows ui elements at the edge of the screen to be hit,
+ * and it prevents hitting ui elements that are not at the edge of the
+ * screen when the finger is touching the edge.
+ */
int pos[2][2];
int f, a;
int base = 2;
--
1.6.4.2
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