324 lines
9.6 KiB
C
324 lines
9.6 KiB
C
/*
|
|
* Copyright (c) 2022 Google LLC
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT gpio_keys
|
|
|
|
#include <zephyr/device.h>
|
|
#include <zephyr/drivers/gpio.h>
|
|
#include <zephyr/input/input.h>
|
|
#include <zephyr/kernel.h>
|
|
#include <zephyr/logging/log.h>
|
|
#include <zephyr/pm/device.h>
|
|
#include <zephyr/pm/device_runtime.h>
|
|
#include <zephyr/sys/atomic.h>
|
|
|
|
LOG_MODULE_REGISTER(gpio_keys, CONFIG_INPUT_LOG_LEVEL);
|
|
|
|
struct gpio_keys_callback {
|
|
struct gpio_callback gpio_cb;
|
|
int8_t pin_state;
|
|
};
|
|
|
|
struct gpio_keys_pin_config {
|
|
/** GPIO specification from devicetree */
|
|
struct gpio_dt_spec spec;
|
|
/** Zephyr code from devicetree */
|
|
uint32_t zephyr_code;
|
|
};
|
|
|
|
struct gpio_keys_pin_data {
|
|
const struct device *dev;
|
|
struct gpio_keys_callback cb_data;
|
|
struct k_work_delayable work;
|
|
int8_t pin_state;
|
|
};
|
|
|
|
struct gpio_keys_config {
|
|
/** Debounce interval in milliseconds from devicetree */
|
|
uint32_t debounce_interval_ms;
|
|
const int num_keys;
|
|
const struct gpio_keys_pin_config *pin_cfg;
|
|
struct gpio_keys_pin_data *pin_data;
|
|
k_work_handler_t handler;
|
|
bool polling_mode;
|
|
bool no_disconnect;
|
|
};
|
|
|
|
struct gpio_keys_data {
|
|
#ifdef CONFIG_PM_DEVICE
|
|
atomic_t suspended;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* Handle debounced gpio pin state.
|
|
*/
|
|
static void gpio_keys_poll_pin(const struct device *dev, int key_index)
|
|
{
|
|
const struct gpio_keys_config *cfg = dev->config;
|
|
const struct gpio_keys_pin_config *pin_cfg = &cfg->pin_cfg[key_index];
|
|
struct gpio_keys_pin_data *pin_data = &cfg->pin_data[key_index];
|
|
int new_pressed;
|
|
int ret;
|
|
|
|
ret = gpio_pin_get_dt(&pin_cfg->spec);
|
|
if (ret < 0) {
|
|
LOG_ERR("key_index %d get failed: %d", key_index, ret);
|
|
return;
|
|
}
|
|
|
|
new_pressed = ret;
|
|
LOG_DBG("%s: pin_state=%d, new_pressed=%d, key_index=%d", dev->name,
|
|
pin_data->cb_data.pin_state, new_pressed, key_index);
|
|
|
|
/* If gpio changed, report the event */
|
|
if (new_pressed != pin_data->cb_data.pin_state) {
|
|
pin_data->cb_data.pin_state = new_pressed;
|
|
LOG_DBG("Report event %s %d, code=%d", dev->name, new_pressed,
|
|
pin_cfg->zephyr_code);
|
|
input_report_key(dev, pin_cfg->zephyr_code, new_pressed, true, K_FOREVER);
|
|
}
|
|
}
|
|
|
|
static __maybe_unused void gpio_keys_poll_pins(struct k_work *work)
|
|
{
|
|
struct k_work_delayable *dwork = k_work_delayable_from_work(work);
|
|
struct gpio_keys_pin_data *pin_data = CONTAINER_OF(dwork, struct gpio_keys_pin_data, work);
|
|
const struct device *dev = pin_data->dev;
|
|
const struct gpio_keys_config *cfg = dev->config;
|
|
|
|
#ifdef CONFIG_PM_DEVICE
|
|
struct gpio_keys_data *data = dev->data;
|
|
|
|
if (atomic_get(&data->suspended) == 1) {
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
for (int i = 0; i < cfg->num_keys; i++) {
|
|
gpio_keys_poll_pin(dev, i);
|
|
}
|
|
|
|
k_work_reschedule(dwork, K_MSEC(cfg->debounce_interval_ms));
|
|
}
|
|
|
|
static __maybe_unused void gpio_keys_change_deferred(struct k_work *work)
|
|
{
|
|
struct k_work_delayable *dwork = k_work_delayable_from_work(work);
|
|
struct gpio_keys_pin_data *pin_data = CONTAINER_OF(dwork, struct gpio_keys_pin_data, work);
|
|
const struct device *dev = pin_data->dev;
|
|
const struct gpio_keys_config *cfg = dev->config;
|
|
int key_index = pin_data - (struct gpio_keys_pin_data *)cfg->pin_data;
|
|
|
|
#ifdef CONFIG_PM_DEVICE
|
|
struct gpio_keys_data *data = dev->data;
|
|
|
|
if (atomic_get(&data->suspended) == 1) {
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
gpio_keys_poll_pin(dev, key_index);
|
|
}
|
|
|
|
static void gpio_keys_interrupt(const struct device *dev, struct gpio_callback *cbdata,
|
|
uint32_t pins)
|
|
{
|
|
struct gpio_keys_callback *keys_cb = CONTAINER_OF(
|
|
cbdata, struct gpio_keys_callback, gpio_cb);
|
|
struct gpio_keys_pin_data *pin_data = CONTAINER_OF(
|
|
keys_cb, struct gpio_keys_pin_data, cb_data);
|
|
const struct gpio_keys_config *cfg = pin_data->dev->config;
|
|
|
|
ARG_UNUSED(dev); /* GPIO device pointer. */
|
|
ARG_UNUSED(pins);
|
|
|
|
k_work_reschedule(&pin_data->work, K_MSEC(cfg->debounce_interval_ms));
|
|
}
|
|
|
|
static int gpio_keys_interrupt_configure(const struct gpio_dt_spec *gpio_spec,
|
|
struct gpio_keys_callback *cb, uint32_t zephyr_code)
|
|
{
|
|
int ret;
|
|
|
|
gpio_init_callback(&cb->gpio_cb, gpio_keys_interrupt, BIT(gpio_spec->pin));
|
|
|
|
ret = gpio_add_callback(gpio_spec->port, &cb->gpio_cb);
|
|
if (ret < 0) {
|
|
LOG_ERR("Could not set gpio callback");
|
|
return ret;
|
|
}
|
|
|
|
cb->pin_state = gpio_pin_get_dt(gpio_spec);
|
|
|
|
LOG_DBG("port=%s, pin=%d", gpio_spec->port->name, gpio_spec->pin);
|
|
|
|
ret = gpio_pin_interrupt_configure_dt(gpio_spec, GPIO_INT_EDGE_BOTH);
|
|
if (ret < 0) {
|
|
LOG_ERR("interrupt configuration failed: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_keys_init(const struct device *dev)
|
|
{
|
|
const struct gpio_keys_config *cfg = dev->config;
|
|
struct gpio_keys_pin_data *pin_data = cfg->pin_data;
|
|
int ret;
|
|
|
|
for (int i = 0; i < cfg->num_keys; i++) {
|
|
const struct gpio_dt_spec *gpio = &cfg->pin_cfg[i].spec;
|
|
|
|
if (!gpio_is_ready_dt(gpio)) {
|
|
LOG_ERR("%s is not ready", gpio->port->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = gpio_pin_configure_dt(gpio, GPIO_INPUT);
|
|
if (ret != 0) {
|
|
LOG_ERR("Pin %d configuration failed: %d", i, ret);
|
|
return ret;
|
|
}
|
|
|
|
pin_data[i].dev = dev;
|
|
k_work_init_delayable(&pin_data[i].work, cfg->handler);
|
|
|
|
if (cfg->polling_mode) {
|
|
continue;
|
|
}
|
|
|
|
ret = gpio_keys_interrupt_configure(&cfg->pin_cfg[i].spec,
|
|
&pin_data[i].cb_data,
|
|
cfg->pin_cfg[i].zephyr_code);
|
|
if (ret != 0) {
|
|
LOG_ERR("Pin %d interrupt configuration failed: %d", i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (cfg->polling_mode) {
|
|
/* use pin 0 work to poll all the pins periodically */
|
|
k_work_reschedule(&pin_data[0].work, K_MSEC(cfg->debounce_interval_ms));
|
|
}
|
|
|
|
ret = pm_device_runtime_enable(dev);
|
|
if (ret < 0) {
|
|
LOG_ERR("Failed to enable runtime power management");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_DEVICE
|
|
static int gpio_keys_pm_action(const struct device *dev,
|
|
enum pm_device_action action)
|
|
{
|
|
const struct gpio_keys_config *cfg = dev->config;
|
|
struct gpio_keys_data *data = dev->data;
|
|
struct gpio_keys_pin_data *pin_data = cfg->pin_data;
|
|
int ret;
|
|
|
|
switch (action) {
|
|
case PM_DEVICE_ACTION_SUSPEND:
|
|
atomic_set(&data->suspended, 1);
|
|
|
|
for (int i = 0; i < cfg->num_keys; i++) {
|
|
const struct gpio_dt_spec *gpio = &cfg->pin_cfg[i].spec;
|
|
|
|
if (!cfg->polling_mode) {
|
|
ret = gpio_pin_interrupt_configure_dt(gpio, GPIO_INT_DISABLE);
|
|
if (ret < 0) {
|
|
LOG_ERR("interrupt configuration failed: %d", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (!cfg->no_disconnect) {
|
|
ret = gpio_pin_configure_dt(gpio, GPIO_DISCONNECTED);
|
|
if (ret != 0) {
|
|
LOG_ERR("Pin %d configuration failed: %d", i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
case PM_DEVICE_ACTION_RESUME:
|
|
atomic_set(&data->suspended, 0);
|
|
|
|
for (int i = 0; i < cfg->num_keys; i++) {
|
|
const struct gpio_dt_spec *gpio = &cfg->pin_cfg[i].spec;
|
|
|
|
if (!cfg->no_disconnect) {
|
|
ret = gpio_pin_configure_dt(gpio, GPIO_INPUT);
|
|
if (ret != 0) {
|
|
LOG_ERR("Pin %d configuration failed: %d", i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (cfg->polling_mode) {
|
|
k_work_reschedule(&pin_data[0].work,
|
|
K_MSEC(cfg->debounce_interval_ms));
|
|
} else {
|
|
ret = gpio_pin_interrupt_configure_dt(gpio, GPIO_INT_EDGE_BOTH);
|
|
if (ret < 0) {
|
|
LOG_ERR("interrupt configuration failed: %d", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#define GPIO_KEYS_CFG_CHECK(node_id) \
|
|
BUILD_ASSERT(DT_NODE_HAS_PROP(node_id, zephyr_code), \
|
|
"zephyr-code must be specified to use the input-gpio-keys driver");
|
|
|
|
#define GPIO_KEYS_CFG_DEF(node_id) \
|
|
{ \
|
|
.spec = GPIO_DT_SPEC_GET(node_id, gpios), \
|
|
.zephyr_code = DT_PROP(node_id, zephyr_code), \
|
|
}
|
|
|
|
#define GPIO_KEYS_INIT(i) \
|
|
DT_INST_FOREACH_CHILD_STATUS_OKAY(i, GPIO_KEYS_CFG_CHECK); \
|
|
\
|
|
static const struct gpio_keys_pin_config gpio_keys_pin_config_##i[] = { \
|
|
DT_INST_FOREACH_CHILD_STATUS_OKAY_SEP(i, GPIO_KEYS_CFG_DEF, (,))}; \
|
|
\
|
|
static struct gpio_keys_pin_data \
|
|
gpio_keys_pin_data_##i[ARRAY_SIZE(gpio_keys_pin_config_##i)]; \
|
|
\
|
|
static const struct gpio_keys_config gpio_keys_config_##i = { \
|
|
.debounce_interval_ms = DT_INST_PROP(i, debounce_interval_ms), \
|
|
.num_keys = ARRAY_SIZE(gpio_keys_pin_config_##i), \
|
|
.pin_cfg = gpio_keys_pin_config_##i, \
|
|
.pin_data = gpio_keys_pin_data_##i, \
|
|
.handler = COND_CODE_1(DT_INST_PROP(i, polling_mode), \
|
|
(gpio_keys_poll_pins), (gpio_keys_change_deferred)), \
|
|
.polling_mode = DT_INST_PROP(i, polling_mode), \
|
|
.no_disconnect = DT_INST_PROP(i, no_disconnect), \
|
|
}; \
|
|
\
|
|
static struct gpio_keys_data gpio_keys_data_##i; \
|
|
\
|
|
PM_DEVICE_DT_INST_DEFINE(i, gpio_keys_pm_action); \
|
|
\
|
|
DEVICE_DT_INST_DEFINE(i, &gpio_keys_init, PM_DEVICE_DT_INST_GET(i), \
|
|
&gpio_keys_data_##i, &gpio_keys_config_##i, \
|
|
POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, NULL);
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(GPIO_KEYS_INIT)
|