Ken Van Hoeylandt
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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#include <tactility/drivers/gpio_hog.h>
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#include <tactility/device.h>
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#include <tactility/driver.h>
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#include <tactility/drivers/gpio_controller.h>
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#include <tactility/error.h>
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#include <tactility/log.h>
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#include <tactility/module.h>
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#define TAG "GpioHog"
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#define GET_CONFIG(device) (static_cast<const GpioHogConfig*>((device)->config))
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namespace {
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const DeviceType GPIO_HOG_TYPE { .name = "gpio_hog" };
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}
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static error_t start(Device* device) {
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const auto* config = GET_CONFIG(device);
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auto* descriptor = gpio_descriptor_acquire(config->pin.gpio_controller, config->pin.pin, GPIO_OWNER_HOG);
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if (descriptor == nullptr) {
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LOG_E(TAG, "Failed to acquire GPIO descriptor");
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return ERROR_RESOURCE;
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}
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bool ok;
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switch (config->mode) {
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case GPIO_HOG_MODE_OUTPUT_HIGH:
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ok = gpio_descriptor_set_flags(descriptor, GPIO_FLAG_DIRECTION_OUTPUT) == ERROR_NONE &&
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gpio_descriptor_set_level(descriptor, true) == ERROR_NONE;
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break;
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case GPIO_HOG_MODE_OUTPUT_LOW:
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ok = gpio_descriptor_set_flags(descriptor, GPIO_FLAG_DIRECTION_OUTPUT) == ERROR_NONE &&
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gpio_descriptor_set_level(descriptor, false) == ERROR_NONE;
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break;
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case GPIO_HOG_MODE_INPUT:
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ok = gpio_descriptor_set_flags(descriptor, GPIO_FLAG_DIRECTION_INPUT) == ERROR_NONE;
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break;
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default:
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ok = false;
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break;
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}
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if (!ok) {
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LOG_E(TAG, "Failed to configure hogged pin %u", config->pin.pin);
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gpio_descriptor_release(descriptor);
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return ERROR_RESOURCE;
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}
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device_set_driver_data(device, descriptor);
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return ERROR_NONE;
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}
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static error_t stop(Device* device) {
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auto* descriptor = static_cast<GpioDescriptor*>(device_get_driver_data(device));
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gpio_descriptor_release(descriptor);
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return ERROR_NONE;
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}
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extern Module root_module;
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Driver gpio_hog_driver = {
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.name = "gpio_hog",
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.compatible = (const char*[]) { "tactility,gpio-hog", nullptr },
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.start_device = start,
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.stop_device = stop,
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.api = nullptr,
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.device_type = &GPIO_HOG_TYPE,
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.owner = &root_module,
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.internal = nullptr
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};
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