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Staging: dream: synaptics touchscreen for dream: documentation

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This adds pointer to hardware documentation, and adds code comment
from Arve.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavel Machek 2009-08-05 00:00:10 +02:00 committed by Greg Kroah-Hartman
parent 4191934cb6
commit 58c6d6d1a6
1 changed files with 17 additions and 0 deletions
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17
drivers/staging/dream/synaptics_i2c_rmi.c
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@ -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;