Hi,
On 2017년 02월 10일 11:17, Andi Shyti wrote:
> The stmfts (ST-Microelectronics FingerTip S) touchscreen device
> is a capacitive multi-touch controller mainly for mobile use.
>
> It's connected through i2c bus at the address 0x49 and it
> interfaces with userspace through input event interface.
>
> At the current state it provides a touchscreen multitouch
> functionality up to 10 fingers. Each finger is enumerated with a
> distinctive id (from 0 to 9).
>
> If enabled the device can support single "touch" hovering, by
> providing three coordinates, x, y and distance.
>
> It is possible to select the touchkey functionality which
> provides a basic two keys interface for "home" and "back" menu,
> typical in mobile phones.
>
> Signed-off-by: Andi Shyti <[email protected]>
> ---
> drivers/input/touchscreen/Kconfig | 12 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/stmfts.c | 794
> +++++++++++++++++++++++++++++++++++++
> 3 files changed, 807 insertions(+)
> create mode 100644 drivers/input/touchscreen/stmfts.c
>
[snip]
> +static void stmfts_parse_event(struct stmfts_data *sdata, u8 event[])
> +{
> + int ret;
> + u8 id, t_id = 0;
> + u16 x, y, z, maj, min, orientation, area;
> +
> + id = event[0];
> +
> + do {
> + mutex_lock(&sdata->mutex);
> + if (sdata->in_touch) {
> + id = event[0] & STMFTS_MASK_EVENT_ID;
> + t_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
> + } else {
> + id = event[0];
> + t_id = 0;
> + }
> +
> + switch (id) {
> + case STMFTS_EV_NO_EVENT:
> + break;
> +
> + case STMFTS_EV_MULTI_TOUCH_ENTER:
> + case STMFTS_EV_MULTI_TOUCH_LEAVE:
> + case STMFTS_EV_MULTI_TOUCH_MOTION:
> + if (id == STMFTS_EV_MULTI_TOUCH_ENTER) {
> + if (!(sdata->in_touch++))
> + input_mt_report_slot_state(
> + sdata->input,
> + MT_TOOL_FINGER, true);
> + } else if (id == STMFTS_EV_MULTI_TOUCH_LEAVE) {
> + if (!(--sdata->in_touch))
> + input_mt_report_slot_state(
> + sdata->input,
> + MT_TOOL_FINGER, false);
> + }
> +
> + x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
> + y = (event[2] >> 4) | (event[3] << 4);
> +
> + maj = event[4];
> + min = event[5];
> + orientation = event[6];
> + area = event[7];
> +
> + input_mt_slot(sdata->input, t_id);
> + input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
> + input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
> + input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
> + input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
> + input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
> + input_report_abs(sdata->input, ABS_MT_ORIENTATION,
> + orientation);
> + input_sync(sdata->input);
> +
When I tested this patch on TM2 board, It looks like it is not well working.
So, I tried to check the input event by using the evtest tool.
But, the result don't show the proper ABS_MT_TRACKING_ID event.
[1] https://cgit.freedesktop.org/evtest/
According to the mutlti-touch-protocol.txt[2], there are two multi-touch
protocol.
As far as I knew, this driver supports the Protocol B which needs
the ABS_MT_TRACKING_ID according to the multi-touch-protocol.txt[2].
[2] Documentation/input/mutlti-touch-protocol.txt
In our test, the ABS_MT_TRACKING_ID is showed only one time.
After pressing/releasing finger from touchscreen on first time,
there are no ABS_MT_TRACKING_ID information from second try with finger.
I guess that input_mt_report_slot_state() is not calling properly.
> + break;
> +
> + case STMFTS_EV_HOVER_ENTER:
> + case STMFTS_EV_HOVER_LEAVE:
> + case STMFTS_EV_HOVER_MOTION:
> + x = (event[2] << 4) | (event[4] >> 4);
> + y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
> + z = event[5];
> + orientation = event[6] & STMFTS_MASK_Y_LSB;
> +
> + input_report_abs(sdata->input, ABS_X, x);
> + input_report_abs(sdata->input, ABS_Y, y);
> + input_report_abs(sdata->input, ABS_DISTANCE, z);
> + input_sync(sdata->input);
> +
> + break;
> +
[snip]
--
Best Regards,
Chanwoo Choi
Samsung Electronics
