I have found a solution here: http://lists.atmark-techno.com/pipermail/armadillo/2013-July/009068.html
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c index 4ab3713..170123d 100644 --- a/drivers/input/touchscreen/st1232.c +++ b/drivers/input/touchscreen/st1232.c @@ -26,6 +26,8 @@ #include <linux/slab.h> #include <linux/types.h> +#define FORCE_SINGLE_EVENT + #define ST1232_TS_NAME "st1232-ts" #define MIN_X 0x00 @@ -100,11 +102,27 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) struct input_dev *input_dev = ts->input_dev; int count = 0; int i, ret; + static int pendown = 0; ret = st1232_ts_read_data(ts); if (ret < 0) goto end; +#ifdef FORCE_SINGLE_EVENT + for (i = 0; i < 1; i++) { + if (!finger[i].is_valid) { + pendown = 0; + input_report_key(input_dev, BTN_TOUCH, 0); + input_report_abs(input_dev, ABS_PRESSURE, 0); + } else { + if (pendown++ == 0) + input_report_key(input_dev, BTN_TOUCH, 1); + input_report_abs(input_dev, ABS_PRESSURE, 1); + input_report_abs(input_dev, ABS_X, finger[i].x); + input_report_abs(input_dev, ABS_Y, finger[i].y); + } + } +#else /* multi touch protocol */ for (i = 0; i < MAX_FINGERS; i++) { if (!finger[i].is_valid) @@ -120,6 +138,7 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) /* SYN_MT_REPORT only if no contact */ if (!count) input_mt_sync(input_dev); +#endif /* SYN_REPORT */ input_sync(input_dev); @@ -164,9 +183,16 @@ static int __devinit st1232_ts_probe(struct i2c_client *client, __set_bit(EV_KEY, input_dev->evbit); __set_bit(EV_ABS, input_dev->evbit); +#ifdef FORCE_SINGLE_EVENT + input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1, 0, 0); + input_set_abs_params(input_dev, ABS_X, MIN_X, MAX_X, 0, 0); + input_set_abs_params(input_dev, ABS_Y, MIN_Y, MAX_Y, 0, 0); +#else input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0); +#endif error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler, IRQF_ONESHOT, client->name, ts);I think tslib does not understand multi-touch protocol, so the solution is using single-touch in st1232 driver. A better solution would be the latest tslib and Qt with multi-touch support.
Regards
