Some serial wacom devices support two-finger touch. Test for this during
init and parse the touch packets accordingly. Touch packets are
processed using Protocol B (MT Slots).
Note: there are several wacom versions that do touch but not two-finger
touch. These are not catered for here, touch events for these are simply
discarded.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
CC: Henrik Rydberg <rydberg@euromail.se>
---
Changes to v1:
- model MT slot approach after Henrik's bamboo patches
- add a comment about what the missing bytes are in the data packets
Henrik, I think this addresses all your comments? The patch is certainly
a bit simpler now.
drivers/input/touchscreen/wacom_w8001.c | 49 +++++++++++++++++++++++++++++--
1 files changed, 46 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index 7feac22..297c79d 100644
--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -49,6 +49,8 @@ MODULE_LICENSE("GPL");
#define W8001_PKTLEN_TPCCTL 11 /* control packet */
#define W8001_PKTLEN_TOUCH2FG 13
+#define MAX_TRACKING_ID 0xFF /* arbitrarily chosen */
+
struct w8001_coord {
u8 rdy;
u8 tsw;
@@ -86,6 +88,7 @@ struct w8001 {
char phys[32];
int type;
unsigned int pktlen;
+ int trkid[2];
};
static void parse_data(u8 *data, struct w8001_coord *coord)
@@ -112,6 +115,35 @@ static void parse_data(u8 *data, struct w8001_coord *coord)
coord->tilt_y = data[8] & 0x7F;
}
+static void parse_touch(struct w8001 *w8001)
+{
+ static int trkid;
+ struct input_dev *dev = w8001->dev;
+ unsigned char *data = w8001->data;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ input_mt_slot(dev, i);
+
+ if (data[0] & (1 << i)) {
+ int x = (data[6 * i + 1] << 7) | (data[6 * i + 2]);
+ int y = (data[6 * i + 3] << 7) | (data[6 * i + 4]);
+ /* data[5,6] and [11,12] is finger capacity */
+
+ input_report_abs(dev, ...
