From 7b658b57d05317656fec750eca1094049de41c76 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Fri, 26 Nov 2021 14:37:40 +0000 Subject: [PATCH] input: edt-ft5x06: Handle unreliable TOUCH_UP events The ft5x06 is unreliable in sending touch up events, so some touch IDs can become stuck in the detected state. Ensure that IDs that are unreported by the controller are released. Signed-off-by: Dave Stevenson --- drivers/input/touchscreen/edt-ft5x06.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -127,6 +127,7 @@ struct edt_ft5x06_ts_data { int offset_y; int report_rate; int max_support_points; + unsigned int known_ids; char name[EDT_NAME_LEN]; @@ -201,6 +202,9 @@ static irqreturn_t edt_ft5x06_ts_isr(int int i, type, x, y, id; int offset, tplen, datalen, crclen; int error; + unsigned int active_ids = 0, known_ids = tsdata->known_ids; + long released_ids; + int b = 0; switch (tsdata->version) { case EDT_M06: @@ -272,10 +276,25 @@ static irqreturn_t edt_ft5x06_ts_isr(int input_mt_slot(tsdata->input, id); if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, - type != TOUCH_EVENT_UP)) + type != TOUCH_EVENT_UP)) { touchscreen_report_pos(tsdata->input, &tsdata->prop, x, y, true); + active_ids |= BIT(id); + } else { + known_ids &= ~BIT(id); + } + } + + /* One issue with the device is the TOUCH_UP message is not always + * returned. Instead track which ids we know about and report when they + * are no longer updated + */ + released_ids = known_ids & ~active_ids; + for_each_set_bit_from(b, &released_ids, tsdata->max_support_points) { + input_mt_slot(tsdata->input, b); + input_mt_report_slot_inactive(tsdata->input); } + tsdata->known_ids = active_ids; input_mt_report_pointer_emulation(tsdata->input, true); input_sync(tsdata->input);