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Input: wacom_w8001 - add multitouch slot support 

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>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Peter Hutterer 2010-08-28 22:00:47 -07:00 committed by Dmitry Torokhov
parent aaba933eeb
commit 5e8b9140f3
1 changed files with 46 additions and 3 deletions
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49
drivers/input/touchscreen/wacom_w8001.c
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@ -48,6 +48,8 @@ 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;
@ -85,6 +87,7 @@ struct w8001 {
char phys[32];
int type;
unsigned int pktlen;
int trkid[2];
};
static void parse_data(u8 *data, struct w8001_coord *coord)
@ -111,6 +114,35 @@ 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, ABS_MT_POSITION_X, x);
input_report_abs(dev, ABS_MT_POSITION_Y, y);
input_report_abs(dev, ABS_MT_TOOL_TYPE, MT_TOOL_FINGER);
if (w8001->trkid[i] < 0)
w8001->trkid[i] = trkid++ & MAX_TRACKING_ID;
} else {
w8001->trkid[i] = -1;
}
input_report_abs(dev, ABS_MT_TRACKING_ID, w8001->trkid[i]);
}
input_sync(dev);
}
static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
{
memset(query, 0, sizeof(*query));
@ -220,10 +252,10 @@ 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);
break;
}
@ -285,6 +317,16 @@ 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, MAX_TRACKING_ID, 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;
}
}
@ -330,6 +372,7 @@ static int w8001_connect(struct serio *serio, struct serio_driver *drv)
w8001->serio = serio;
w8001->id = serio->id.id;
w8001->dev = input_dev;
w8001->trkid[0] = w8001->trkid[1] = -1;
init_completion(&w8001->cmd_done);
snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);