blob: 6b05b9cf19481eef5191d6c86a77d6040c1bb6f9 [file] [log] [blame] [edit]
/*
* Copyright (c) 2020 NXP
* Copyright (c) 2020 Mark Olsson <mark@markolsson.se>
* Copyright (c) 2020 Teslabs Engineering S.L.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT focaltech_ft5336
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/input/input.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(ft5336, CONFIG_INPUT_LOG_LEVEL);
/* FT5336 used registers */
#define REG_TD_STATUS 0x02U
#define REG_P1_XH 0x03U
/* REG_TD_STATUS: Touch points. */
#define TOUCH_POINTS_POS 0U
#define TOUCH_POINTS_MSK 0x0FU
/* REG_Pn_XH: Events. */
#define EVENT_POS 6U
#define EVENT_MSK 0x03U
#define EVENT_PRESS_DOWN 0x00U
#define EVENT_LIFT_UP 0x01U
#define EVENT_CONTACT 0x02U
#define EVENT_NONE 0x03U
/* REG_Pn_XH: Position */
#define POSITION_H_MSK 0x0FU
/** FT5336 configuration (DT). */
struct ft5336_config {
/** I2C bus. */
struct i2c_dt_spec bus;
#ifdef CONFIG_INPUT_FT5336_INTERRUPT
/** Interrupt GPIO information. */
struct gpio_dt_spec int_gpio;
#endif
};
/** FT5336 data. */
struct ft5336_data {
/** Device pointer. */
const struct device *dev;
/** Work queue (for deferred read). */
struct k_work work;
#ifdef CONFIG_INPUT_FT5336_INTERRUPT
/** Interrupt GPIO callback. */
struct gpio_callback int_gpio_cb;
#else
/** Timer (polling mode). */
struct k_timer timer;
#endif
/** Last pressed state. */
bool pressed_old;
};
static int ft5336_process(const struct device *dev)
{
const struct ft5336_config *config = dev->config;
struct ft5336_data *data = dev->data;
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) */
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:
* REG_P1_XH, REG_P1_XL, REG_P1_YH, REG_P1_YL.
*/
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);
if (pressed) {
input_report_abs(dev, INPUT_ABS_X, col, false, K_FOREVER);
input_report_abs(dev, INPUT_ABS_Y, row, false, K_FOREVER);
input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);
} else if (data->pressed_old && !pressed) {
input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);
}
data->pressed_old = pressed;
return 0;
}
static void ft5336_work_handler(struct k_work *work)
{
struct ft5336_data *data = CONTAINER_OF(work, struct ft5336_data, work);
ft5336_process(data->dev);
}
#ifdef CONFIG_INPUT_FT5336_INTERRUPT
static void ft5336_isr_handler(const struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct ft5336_data *data = CONTAINER_OF(cb, struct ft5336_data, int_gpio_cb);
k_work_submit(&data->work);
}
#else
static void ft5336_timer_handler(struct k_timer *timer)
{
struct ft5336_data *data = CONTAINER_OF(timer, struct ft5336_data, timer);
k_work_submit(&data->work);
}
#endif
static int ft5336_init(const struct device *dev)
{
const struct ft5336_config *config = dev->config;
struct ft5336_data *data = dev->data;
if (!device_is_ready(config->bus.bus)) {
LOG_ERR("I2C controller device not ready");
return -ENODEV;
}
data->dev = dev;
k_work_init(&data->work, ft5336_work_handler);
#ifdef CONFIG_INPUT_FT5336_INTERRUPT
int r;
if (!device_is_ready(config->int_gpio.port)) {
LOG_ERR("Interrupt GPIO controller device not ready");
return -ENODEV;
}
r = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
if (r < 0) {
LOG_ERR("Could not configure interrupt GPIO pin");
return r;
}
r = gpio_pin_interrupt_configure_dt(&config->int_gpio,
GPIO_INT_EDGE_TO_ACTIVE);
if (r < 0) {
LOG_ERR("Could not configure interrupt GPIO interrupt.");
return r;
}
gpio_init_callback(&data->int_gpio_cb, ft5336_isr_handler,
BIT(config->int_gpio.pin));
r = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
if (r < 0) {
LOG_ERR("Could not set gpio callback");
return r;
}
#else
k_timer_init(&data->timer, ft5336_timer_handler, NULL);
k_timer_start(&data->timer, K_MSEC(CONFIG_INPUT_FT5336_PERIOD),
K_MSEC(CONFIG_INPUT_FT5336_PERIOD));
#endif
return 0;
}
#define FT5336_INIT(index) \
static const struct ft5336_config ft5336_config_##index = { \
.bus = I2C_DT_SPEC_INST_GET(index), \
IF_ENABLED(CONFIG_INPUT_FT5336_INTERRUPT, \
(.int_gpio = GPIO_DT_SPEC_INST_GET(index, int_gpios),)) \
}; \
static struct ft5336_data ft5336_data_##index; \
DEVICE_DT_INST_DEFINE(index, ft5336_init, NULL, \
&ft5336_data_##index, &ft5336_config_##index, \
POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, NULL);
DT_INST_FOREACH_STATUS_OKAY(FT5336_INIT)