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Commit 8f5d6d8f authored by Figo Wang's avatar Figo Wang Committed by Abinaya P
Browse files

input: touchpanel: fix the number of touch events detection 



Focaltech controllers can reports the number of touch points by read
"TD_STATUS" register. Read this register to avoid always looping
through maximum number of touches supported.

This patch is propagated from 3.18 kernel
'commit 4c142d16fced ("input: touchpanel: fix the number of touch
events detection")'

Change-Id: I8ab111b56b2074cb52cb021d37e9e6505c8b7c72
Signed-off-by: default avatarFigo Wang <figow@codeaurora.org>
Signed-off-by: default avatarBingzhe Cai <bingzhec@codeaurora.org>
parent e6d2a8e4

drivers/input/touchscreen/ft5x06_ts.c

+5 −1
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ 
#define FT_ERASE_PANEL_REG	0x63

#define FT_FW_START_REG		0xBF



#define FT_STATUS_NUM_TP_MASK	0x0F



#define FT_VTG_MIN_UV		2600000

#define FT_VTG_MAX_UV		3300000
@@ -329,6 +330,7 @@ static void ft5x06_report_value(struct ft5x06_ts_data *data) 
static int ft5x06_handle_touchdata(struct ft5x06_ts_data *data)

{

	struct ts_event *event = &data->event;

	int num_points;

	int ret, i;

	u8 buf[POINT_READ_BUF] = { 0 };

	u8 pointid = FT_MAX_ID;
@@ -342,7 +344,9 @@ static int ft5x06_handle_touchdata(struct ft5x06_ts_data *data) 
	memset(event, 0, sizeof(struct ts_event));



	event->touch_point = 0;

	for (i = 0; i < CFG_MAX_TOUCH_POINTS; i++) {

	num_points = buf[2] & FT_STATUS_NUM_TP_MASK;



	for (i = 0; i < num_points; i++) {

		pointid = (buf[FT_TOUCH_ID_POS + FT_TOUCH_STEP * i]) >> 4;

		if (pointid >= FT_MAX_ID)

			break;