276 lines
6.7 KiB
C
276 lines
6.7 KiB
C
/*
|
|
* 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 <drivers/kscan.h>
|
|
#include <drivers/i2c.h>
|
|
#include <drivers/gpio.h>
|
|
|
|
#include <logging/log.h>
|
|
LOG_MODULE_REGISTER(ft5336, CONFIG_KSCAN_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
|
|
|
|
/** GPIO DT information. */
|
|
struct gpio_dt_info {
|
|
/** Port. */
|
|
const char *port;
|
|
/** Pin. */
|
|
gpio_pin_t pin;
|
|
/** Flags. */
|
|
gpio_dt_flags_t flags;
|
|
};
|
|
|
|
/** FT5336 configuration (DT). */
|
|
struct ft5336_config {
|
|
/** I2C controller device name. */
|
|
char *i2c_name;
|
|
/** I2C chip address. */
|
|
uint8_t i2c_address;
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
/** Interrupt GPIO information. */
|
|
struct gpio_dt_info int_gpio;
|
|
#endif
|
|
};
|
|
|
|
/** FT5336 data. */
|
|
struct ft5336_data {
|
|
/** Device pointer. */
|
|
const struct device *dev;
|
|
/** I2C controller device. */
|
|
const struct device *i2c;
|
|
/** KSCAN Callback. */
|
|
kscan_callback_t callback;
|
|
/** Work queue (for deferred read). */
|
|
struct k_work work;
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
/** Interrupt GPIO controller. */
|
|
const struct device *int_gpio;
|
|
/** Interrupt GPIO callback. */
|
|
struct gpio_callback int_gpio_cb;
|
|
#else
|
|
/** Timer (polling mode). */
|
|
struct k_timer timer;
|
|
#endif
|
|
};
|
|
|
|
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(data->i2c, config->i2c_address, 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(data->i2c, config->i2c_address, 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);
|
|
|
|
data->callback(dev, row, col, 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_KSCAN_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_configure(const struct device *dev,
|
|
kscan_callback_t callback)
|
|
{
|
|
struct ft5336_data *data = dev->data;
|
|
|
|
if (!callback) {
|
|
LOG_ERR("Invalid callback (NULL)");
|
|
return -EINVAL;
|
|
}
|
|
|
|
data->callback = callback;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ft5336_enable_callback(const struct device *dev)
|
|
{
|
|
struct ft5336_data *data = dev->data;
|
|
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
gpio_add_callback(data->int_gpio, &data->int_gpio_cb);
|
|
#else
|
|
k_timer_start(&data->timer, K_MSEC(CONFIG_KSCAN_FT5336_PERIOD),
|
|
K_MSEC(CONFIG_KSCAN_FT5336_PERIOD));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ft5336_disable_callback(const struct device *dev)
|
|
{
|
|
struct ft5336_data *data = dev->data;
|
|
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
gpio_remove_callback(data->int_gpio, &data->int_gpio_cb);
|
|
#else
|
|
k_timer_stop(&data->timer);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ft5336_init(const struct device *dev)
|
|
{
|
|
const struct ft5336_config *config = dev->config;
|
|
struct ft5336_data *data = dev->data;
|
|
|
|
data->i2c = device_get_binding(config->i2c_name);
|
|
if (!data->i2c) {
|
|
LOG_ERR("Could not find I2C controller");
|
|
return -ENODEV;
|
|
}
|
|
|
|
data->dev = dev;
|
|
|
|
k_work_init(&data->work, ft5336_work_handler);
|
|
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
int r;
|
|
|
|
data->int_gpio = device_get_binding(config->int_gpio.port);
|
|
if (!data->int_gpio) {
|
|
LOG_ERR("Could not find interrupt GPIO controller");
|
|
return -ENODEV;
|
|
}
|
|
|
|
r = gpio_pin_configure(data->int_gpio, config->int_gpio.pin,
|
|
config->int_gpio.flags | GPIO_INPUT);
|
|
if (r < 0) {
|
|
LOG_ERR("Could not configure interrupt GPIO pin");
|
|
return r;
|
|
}
|
|
|
|
r = gpio_pin_interrupt_configure(data->int_gpio, config->int_gpio.pin,
|
|
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));
|
|
#else
|
|
k_timer_init(&data->timer, ft5336_timer_handler, NULL);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct kscan_driver_api ft5336_driver_api = {
|
|
.config = ft5336_configure,
|
|
.enable_callback = ft5336_enable_callback,
|
|
.disable_callback = ft5336_disable_callback,
|
|
};
|
|
|
|
#define DT_INST_GPIO(index, gpio_pha) \
|
|
{ \
|
|
DT_INST_GPIO_LABEL(index, gpio_pha), \
|
|
DT_INST_GPIO_PIN(index, gpio_pha), \
|
|
DT_INST_GPIO_FLAGS(index, gpio_pha), \
|
|
}
|
|
|
|
#ifdef CONFIG_KSCAN_FT5336_INTERRUPT
|
|
#define FT5336_DEFINE_CONFIG(index) \
|
|
static const struct ft5336_config ft5336_config_##index = { \
|
|
.i2c_name = DT_INST_BUS_LABEL(index), \
|
|
.i2c_address = DT_INST_REG_ADDR(index), \
|
|
.int_gpio = DT_INST_GPIO(index, int_gpios) \
|
|
}
|
|
#else
|
|
#define FT5336_DEFINE_CONFIG(index) \
|
|
static const struct ft5336_config ft5336_config_##index = { \
|
|
.i2c_name = DT_INST_BUS_LABEL(index), \
|
|
.i2c_address = DT_INST_REG_ADDR(index) \
|
|
}
|
|
#endif
|
|
|
|
#define FT5336_INIT(index) \
|
|
FT5336_DEFINE_CONFIG(index); \
|
|
static struct ft5336_data ft5336_data_##index; \
|
|
DEVICE_AND_API_INIT(ft5336_##index, DT_INST_LABEL(index), ft5336_init, \
|
|
&ft5336_data_##index, &ft5336_config_##index, \
|
|
POST_KERNEL, CONFIG_KSCAN_INIT_PRIORITY, \
|
|
&ft5336_driver_api);
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(FT5336_INIT)
|