97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
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/*
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* Copyright (c) 2023, Prevas A/S
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ti_tps382x
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#include <errno.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(wdt_ti_tps382x, CONFIG_WDT_LOG_LEVEL);
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struct ti_tps382x_config {
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struct gpio_dt_spec wdi_gpio;
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int timeout;
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};
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static int ti_tps382x_init(const struct device *dev)
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{
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const struct ti_tps382x_config *config = dev->config;
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if (!gpio_is_ready_dt(&config->wdi_gpio)) {
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LOG_ERR("WDI gpio not ready");
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return -ENODEV;
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}
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return 0;
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}
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static int ti_tps382x_setup(const struct device *dev, uint8_t options)
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{
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const struct ti_tps382x_config *config = dev->config;
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return gpio_pin_configure_dt(&config->wdi_gpio, GPIO_OUTPUT);
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}
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static int ti_tps382x_disable(const struct device *dev)
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{
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const struct ti_tps382x_config *config = dev->config;
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/* The watchdog timer can be disabled by disconnecting the WDI pin from
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* the system. Do this by changing the gpio to an input (tri-state).
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*/
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return gpio_pin_configure_dt(&config->wdi_gpio, GPIO_INPUT);
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}
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static int ti_tps382x_install_timeout(const struct device *dev,
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const struct wdt_timeout_cfg *cfg)
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{
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const struct ti_tps382x_config *config = dev->config;
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if (cfg->window.max != config->timeout) {
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LOG_ERR("Upper limit of watchdog timeout must be %d not %u",
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config->timeout, cfg->window.max);
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return -EINVAL;
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} else if (cfg->window.min != 0) {
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LOG_ERR("Window timeouts not supported");
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return -EINVAL;
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} else if (cfg->callback != NULL) {
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LOG_ERR("Callbacks not supported");
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return -EINVAL;
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}
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return 0;
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}
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static int ti_tps382x_feed(const struct device *dev, int channel_id)
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{
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const struct ti_tps382x_config *config = dev->config;
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return gpio_pin_toggle_dt(&config->wdi_gpio);
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}
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static const struct wdt_driver_api ti_tps382x_api = {
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.setup = ti_tps382x_setup,
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.disable = ti_tps382x_disable,
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.install_timeout = ti_tps382x_install_timeout,
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.feed = ti_tps382x_feed,
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};
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#define WDT_TI_TPS382X_INIT(n) \
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static const struct ti_tps382x_config ti_tps382x_##n##config = { \
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.wdi_gpio = GPIO_DT_SPEC_INST_GET(n, wdi_gpios), \
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.timeout = DT_INST_PROP(n, timeout_period), \
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}; \
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\
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DEVICE_DT_INST_DEFINE( \
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n, ti_tps382x_init, NULL, NULL, &ti_tps382x_##n##config, \
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
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&ti_tps382x_api \
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);
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DT_INST_FOREACH_STATUS_OKAY(WDT_TI_TPS382X_INIT);
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