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Subject[PATCH 3/3] input: add multitouch slot support to w8001.
Date
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>
---
drivers/input/touchscreen/wacom_w8001.c | 99 ++++++++++++++++++++++++++++++-
1 files changed, 96 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index c302cc3..a38a3aa 100644
--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -60,6 +60,17 @@ struct w8001_coord {
u8 tilt_y;
};

+/* touch data packet */
+struct w8001_touch {
+ u8 f1_status;
+ u16 f1_x;
+ u16 f1_y;
+ /* only some tablets have 2FG info */
+ u8 f2_status;
+ u16 f2_x;
+ u16 f2_y;
+};
+
/* touch query reply packet */
struct w8001_touch_query {
u8 panel_res;
@@ -85,8 +96,18 @@ struct w8001 {
char phys[32];
int type;
unsigned int pktlen;
+ unsigned char tracking_id[2];
};

+static int get_next_tracking_id(void)
+{
+ static unsigned char next_tracking_id;
+ next_tracking_id = (next_tracking_id + 1) % 256;
+ if (next_tracking_id == 0)
+ next_tracking_id = 1;
+ return next_tracking_id;
+}
+
static void parse_data(u8 *data, struct w8001_coord *coord)
{
memset(coord, 0, sizeof(*coord));
@@ -111,6 +132,26 @@ static void parse_data(u8 *data, struct w8001_coord *coord)
coord->tilt_y = data[8] & 0x7F;
}

+static void parse_touch(u8 *data,
+ unsigned int pktlen, struct w8001_touch *touch)
+{
+ memset(touch, 0, sizeof(*touch));
+
+ touch->f1_status = data[0] & 0x1;
+ touch->f1_x = data[1] << 7;
+ touch->f1_x |= data[2];
+ touch->f1_y = data[3] << 7;
+ touch->f1_y |= data[4];
+
+ if (pktlen >= W8001_PKTLEN_TOUCH2FG) {
+ touch->f2_status = (data[0] & 0x2) >> 1;
+ touch->f2_x = data[7] << 7;
+ touch->f2_x |= data[8];
+ touch->f2_y = data[9] << 7;
+ touch->f2_y |= data[10];
+ }
+}
+
static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
{
memset(query, 0, sizeof(*query));
@@ -128,6 +169,46 @@ static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
query->y |= (data[2] >> 3) & 0x3;
}

+static void w8001_mt_event(struct input_dev *dev,
+ int slot, int tid, int x, int y)
+{
+ input_mt_slot(dev, slot);
+ if (tid != 0) {
+ input_report_abs(dev, ABS_MT_POSITION_X, x);
+ input_report_abs(dev, ABS_MT_POSITION_Y, y);
+ }
+ input_report_abs(dev, ABS_MT_TRACKING_ID, tid);
+ input_report_abs(dev, ABS_MT_TOOL_TYPE, MT_TOOL_FINGER);
+ input_mt_sync(dev);
+}
+
+static void w8001_track_fingers(struct w8001 *w8001, struct w8001_touch *touch)
+{
+ struct input_dev *dev = w8001->dev;
+
+ if (touch->f1_status) {
+ if (!w8001->tracking_id[0])
+ w8001->tracking_id[0] = get_next_tracking_id();
+ w8001_mt_event(dev, 0, w8001->tracking_id[0],
+ touch->f1_x, touch->f1_y);
+ } else if (w8001->tracking_id[0]) {
+ w8001->tracking_id[0] = 0;
+ w8001_mt_event(dev, 0, 0, touch->f1_x, touch->f1_y);
+ }
+
+ if (touch->f2_status) {
+ if (!w8001->tracking_id[1])
+ w8001->tracking_id[1] = get_next_tracking_id();
+ w8001_mt_event(dev, 1, w8001->tracking_id[1],
+ touch->f2_x, touch->f2_y);
+ } else if (w8001->tracking_id[1]) {
+ w8001->tracking_id[1] = 0;
+ w8001_mt_event(dev, 1, 0, touch->f2_x, touch->f2_y);
+ }
+
+ input_sync(dev);
+}
+
static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
{
struct input_dev *dev = w8001->dev;
@@ -172,6 +253,7 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
{
struct w8001 *w8001 = serio_get_drvdata(serio);
struct w8001_coord coord;
+ struct w8001_touch touch;
unsigned char tmp;

w8001->data[w8001->idx] = data;
@@ -217,10 +299,11 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
complete(&w8001->cmd_done);
break;

+ /* 2 finger touch packet */
case W8001_PKTLEN_TOUCH2FG - 1:
- /* ignore two-finger touch packet. */
- if (w8001->pktlen == w8001->idx)
- w8001->idx = 0;
+ w8001->idx = 0;
+ parse_touch(w8001->data, w8001->pktlen, &touch);
+ w8001_track_fingers(w8001, &touch);
break;
}

@@ -282,6 +365,16 @@ static int w8001_setup(struct w8001 *w8001)
break;
case 5:
w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
+
+ input_mt_create_slots(dev, 2);
+ input_set_abs_params(dev, ABS_MT_TRACKING_ID,
+ 0, 255, 0, 0);
+ input_set_abs_params(dev, ABS_MT_POSITION_X,
+ 0, touch.x, 0, 0);
+ input_set_abs_params(dev, ABS_MT_POSITION_Y,
+ 0, touch.y, 0, 0);
+ input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
+ 0, 0, 0, 0);
break;
}
}
--
1.7.2.1


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