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Driver Input: FT5336 reports touch pressed on no touches

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See https://github.com/zephyrproject-rtos/zephyr/discussions/69997

The driver thinks that when there are zero touches, the screen is
pressed. This changes it so zero touches mean the screen is not
pressed.

Also, multi-touch is now considered a single touch, and the
TOUCH_ID is checked so that only valid touches are registered.

Signed-off-by: Glenn Andrews <glenn.andrews.42@gmail.com>
This commit is contained in:
Glenn Andrews 2024-03-09 11:42:00 -08:00 committed by David Leach
parent 8a38ff7161
commit 2f691ad8de
1 changed files with 39 additions and 21 deletions
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42
drivers/input/input_ft5336.c
View file

@ -13,6 +13,7 @@
#include <zephyr/input/input.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(ft5336, CONFIG_INPUT_LOG_LEVEL);
@ -35,7 +36,13 @@ LOG_MODULE_REGISTER(ft5336, CONFIG_INPUT_LOG_LEVEL);
#define EVENT_CONTACT 0x02U
#define EVENT_NONE 0x03U
/* REG_Pn_XH: Position */
/* REG_Pn_YH: Touch ID */
#define TOUCH_ID_POS 4U
#define TOUCH_ID_MSK 0x0FU
#define TOUCH_ID_INVALID 0x0FU
/* REG_Pn_XH and REG_Pn_YH: Position */
#define POSITION_H_MSK 0x0FU
/* REG_G_PMODE: Power Consume Mode */
@ -77,35 +84,46 @@ static int ft5336_process(const struct device *dev)
int r;
uint8_t points;
uint8_t coords[4U];
uint8_t event;
uint16_t row, col;
bool pressed;
/* obtain number of touch points (NOTE: multi-touch ignored) */
/* obtain number of touch points */
r = i2c_reg_read_byte_dt(&config->bus, REG_TD_STATUS, &points);
if (r < 0) {
return r;
}
points = (points >> TOUCH_POINTS_POS) & TOUCH_POINTS_MSK;
if (points != 0U && points != 1U) {
return 0;
}
/* obtain first point X, Y coordinates and event from:
points = FIELD_GET(TOUCH_POINTS_MSK, points);
if (points != 0) {
/* Any number of touches still counts as one touch. All touch
* points except the first are ignored. Obtain first point
* X, Y coordinates from:
* REG_P1_XH, REG_P1_XL, REG_P1_YH, REG_P1_YL.
* We ignore the Event Flag because Zephyr only cares about
* pressed / not pressed and not press down / lift up
*/
r = i2c_burst_read_dt(&config->bus, REG_P1_XH, coords, sizeof(coords));
if (r < 0) {
return r;
}
event = (coords[0] >> EVENT_POS) & EVENT_MSK;
row = ((coords[0] & POSITION_H_MSK) << 8U) | coords[1];
col = ((coords[2] & POSITION_H_MSK) << 8U) | coords[3];
pressed = (event == EVENT_PRESS_DOWN) || (event == EVENT_CONTACT);
LOG_DBG("event: %d, row: %d, col: %d", event, row, col);
uint8_t touch_id = FIELD_GET(TOUCH_ID_MSK, coords[2]);
if (touch_id != TOUCH_ID_INVALID) {
pressed = true;
LOG_DBG("points: %d, touch_id: %d, row: %d, col: %d",
points, touch_id, row, col);
} else {
pressed = false;
LOG_WRN("bad TOUCH_ID: row: %d, col: %d", row, col);
}
} else {
/* no touch = no press */
pressed = false;
}
if (pressed) {
input_report_abs(dev, INPUT_ABS_X, col, false, K_FOREVER);