zephyr/drivers/input/input_cap1203.c

213 lines
5.4 KiB
C

/*
* Copyright (c) 2022 Keiya Nobuta
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT microchip_cap1203
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/input/input.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(cap1203, CONFIG_INPUT_LOG_LEVEL);
#define REG_MAIN_CONTROL 0x0
#define CONTROL_INT 0x1
#define REG_INPUT_STATUS 0x03
#define REG_INTERRUPT_ENABLE 0x27
#define INTERRUPT_ENABLE 0x7
#define INTERRUPT_DISABLE 0x0
#define TOUCH_INPUT_COUNT 3
struct cap1203_config {
struct i2c_dt_spec i2c;
struct gpio_dt_spec int_gpio;
const uint16_t *input_codes;
};
struct cap1203_data {
const struct device *dev;
struct k_work work;
/* Interrupt GPIO callback. */
struct gpio_callback int_gpio_cb;
uint8_t prev_input_state;
#ifdef CONFIG_INPUT_CAP1203_POLL
/* Timer (polling mode). */
struct k_timer timer;
#endif
};
static int cap1203_clear_interrupt(const struct i2c_dt_spec *i2c)
{
uint8_t ctrl;
int r;
r = i2c_reg_read_byte_dt(i2c, REG_MAIN_CONTROL, &ctrl);
if (r < 0) {
return r;
}
ctrl = ctrl & ~CONTROL_INT;
return i2c_reg_write_byte_dt(i2c, REG_MAIN_CONTROL, ctrl);
}
static int cap1203_enable_interrupt(const struct i2c_dt_spec *i2c, bool enable)
{
uint8_t intr = enable ? INTERRUPT_ENABLE : INTERRUPT_DISABLE;
return i2c_reg_write_byte_dt(i2c, REG_INTERRUPT_ENABLE, intr);
}
static int cap1203_process(const struct device *dev)
{
const struct cap1203_config *config = dev->config;
struct cap1203_data *data = dev->data;
int r;
uint8_t input;
uint8_t single_input_state;
r = i2c_reg_read_byte_dt(&config->i2c, REG_INPUT_STATUS, &input);
if (r < 0) {
return r;
}
for (uint8_t i = 0; i < TOUCH_INPUT_COUNT; i++) {
single_input_state = input & BIT(i);
if (single_input_state != (data->prev_input_state & BIT(i))) {
input_report_key(dev, config->input_codes[i], single_input_state, true,
K_FOREVER);
}
}
data->prev_input_state = input;
LOG_DBG("event: input: %d\n", input);
/*
* Clear INT bit to clear SENSOR INPUT STATUS bits.
* Note that this is also required in polling mode.
*/
r = cap1203_clear_interrupt(&config->i2c);
if (r < 0) {
return r;
}
return 0;
}
static void cap1203_work_handler(struct k_work *work)
{
struct cap1203_data *data = CONTAINER_OF(work, struct cap1203_data, work);
cap1203_process(data->dev);
}
static void cap1203_isr_handler(const struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct cap1203_data *data = CONTAINER_OF(cb, struct cap1203_data, int_gpio_cb);
k_work_submit(&data->work);
}
#ifdef CONFIG_INPUT_CAP1203_POLL
static void cap1203_timer_handler(struct k_timer *timer)
{
struct cap1203_data *data = CONTAINER_OF(timer, struct cap1203_data, timer);
k_work_submit(&data->work);
}
#endif
static int cap1203_init(const struct device *dev)
{
const struct cap1203_config *config = dev->config;
struct cap1203_data *data = dev->data;
int r;
if (!device_is_ready(config->i2c.bus)) {
LOG_ERR("I2C controller device not ready");
return -ENODEV;
}
data->dev = dev;
k_work_init(&data->work, cap1203_work_handler);
if (config->int_gpio.port != NULL) {
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 confighure 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, cap1203_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;
}
r = cap1203_clear_interrupt(&config->i2c);
if (r < 0) {
LOG_ERR("Could not clear interrupt");
return r;
}
r = cap1203_enable_interrupt(&config->i2c, true);
if (r < 0) {
LOG_ERR("Could not configure interrupt");
return r;
}
}
#ifdef CONFIG_INPUT_CAP1203_POLL
else {
k_timer_init(&data->timer, cap1203_timer_handler, NULL);
r = cap1203_enable_interrupt(&config->i2c, false);
if (r < 0) {
LOG_ERR("Could not configure interrupt");
return r;
}
k_timer_start(&data->timer, K_MSEC(CONFIG_INPUT_CAP1203_PERIOD),
K_MSEC(CONFIG_INPUT_CAP1203_PERIOD));
}
#endif
return 0;
}
#define CAP1203_INIT(index) \
static const uint16_t cap1203_input_codes_##inst[] = DT_INST_PROP(index, input_codes); \
BUILD_ASSERT(DT_INST_PROP_LEN(index, input_codes) == TOUCH_INPUT_COUNT); \
static const struct cap1203_config cap1203_config_##index = { \
.i2c = I2C_DT_SPEC_INST_GET(index), \
.int_gpio = GPIO_DT_SPEC_INST_GET_OR(index, int_gpios, {0}), \
.input_codes = cap1203_input_codes_##inst, \
}; \
static struct cap1203_data cap1203_data_##index; \
DEVICE_DT_INST_DEFINE(index, cap1203_init, NULL, &cap1203_data_##index, \
&cap1203_config_##index, POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, \
NULL);
DT_INST_FOREACH_STATUS_OKAY(CAP1203_INIT)