blob: aa121322b91969d569721c8ca54a154ea9daaa6d [file] [log] [blame] [edit]
/*
* Copyright (c) 2022, Basalte bv
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT zephyr_gpio_emul_sdl
#include <zephyr/drivers/gpio/gpio_emul.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <SDL.h>
LOG_MODULE_REGISTER(gpio_emul_sdl, CONFIG_GPIO_LOG_LEVEL);
struct gpio_sdl_config {
const struct device *emul;
const SDL_Scancode *codes;
uint8_t num_codes;
};
static int sdl_filter(void *arg, SDL_Event *event)
{
const struct device *port = arg;
const struct gpio_sdl_config *config = port->config;
int ret;
gpio_pin_t pin = 0;
/* Only handle keyboard events */
switch (event->type) {
case SDL_KEYDOWN:
case SDL_KEYUP:
break;
default:
return 1;
}
/* Search for the corresponding scancode */
while (pin < config->num_codes) {
if (config->codes[pin] == event->key.keysym.scancode) {
break;
}
pin++;
}
if (pin == config->num_codes) {
/* Not tracked */
return 1;
}
/* Lock the scheduler so we can't be preempted,
* as the gpio_emul driver keeps a mutex locked
* for as long as there are pending interrupts
*/
k_sched_lock();
/* Update the pin state */
ret = gpio_emul_input_set(config->emul, pin, event->type == SDL_KEYDOWN ? 1 : 0);
k_sched_unlock();
if (ret < 0) {
LOG_WRN("Failed to emulate input (%d)", ret);
}
return 0;
}
static int gpio_sdl_init(const struct device *dev)
{
const struct gpio_sdl_config *config = dev->config;
for (uint8_t pin = 0; pin < config->num_codes; ++pin) {
if (config->codes[pin] != SDL_SCANCODE_UNKNOWN) {
LOG_INF("GPIO %s:%u = %u", dev->name, pin, config->codes[pin]);
}
}
SDL_AddEventWatch(sdl_filter, (void *)dev);
return 0;
}
#define GPIO_SDL_DEFINE(inst) \
BUILD_ASSERT(DT_NODE_HAS_COMPAT_STATUS(DT_INST_PARENT(inst), \
zephyr_gpio_emul, okay), \
"Enabled parent zephyr,gpio-emul node is required"); \
\
static const SDL_Scancode gpio_sdl_##inst##_codes[] \
= DT_INST_PROP(inst, scancodes); \
\
static const struct gpio_sdl_config gpio_sdl_##inst##_config = { \
.emul = DEVICE_DT_GET(DT_INST_PARENT(inst)), \
.codes = gpio_sdl_##inst##_codes, \
.num_codes = DT_INST_PROP_LEN(inst, scancodes), \
}; \
\
DEVICE_DT_INST_DEFINE(inst, gpio_sdl_init, NULL, NULL, \
&gpio_sdl_##inst##_config, POST_KERNEL, \
CONFIG_GPIO_INIT_PRIORITY, NULL);
DT_INST_FOREACH_STATUS_OKAY(GPIO_SDL_DEFINE)