353 lines
12 KiB
C
353 lines
12 KiB
C
/*
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* Copyright (c) 2023 Espressif Systems (Shanghai) Co., Ltd.
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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 espressif_esp32_touch
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#include <zephyr/device.h>
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#include <zephyr/input/input.h>
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#include <zephyr/kernel.h>
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#include <zephyr/logging/log.h>
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#include <esp_err.h>
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#include <soc/soc_pins.h>
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#include <soc/periph_defs.h>
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#include <hal/touch_sensor_types.h>
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#include <hal/touch_sensor_hal.h>
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#include <driver/rtc_io.h>
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#include <esp_intr_alloc.h>
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LOG_MODULE_REGISTER(espressif_esp32_touch, CONFIG_INPUT_LOG_LEVEL);
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BUILD_ASSERT(!IS_ENABLED(CONFIG_COUNTER_RTC_ESP32),
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"Conflict detected: COUNTER_RTC_ESP32 enabled");
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#define ESP32_SCAN_DONE_MAX_COUNT 5
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#if defined(CONFIG_SOC_SERIES_ESP32)
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#define ESP32_RTC_INTR_MSK RTC_CNTL_TOUCH_INT_ST_M
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#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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#define ESP32_RTC_INTR_MSK (RTC_CNTL_TOUCH_DONE_INT_ST_M | \
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RTC_CNTL_TOUCH_ACTIVE_INT_ST_M | \
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RTC_CNTL_TOUCH_INACTIVE_INT_ST_M | \
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RTC_CNTL_TOUCH_SCAN_DONE_INT_ST_M | \
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RTC_CNTL_TOUCH_TIMEOUT_INT_ST_M)
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#define ESP32_TOUCH_PAD_INTR_MASK (TOUCH_PAD_INTR_MASK_ACTIVE | \
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TOUCH_PAD_INTR_MASK_INACTIVE | \
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TOUCH_PAD_INTR_MASK_TIMEOUT | \
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TOUCH_PAD_INTR_MASK_SCAN_DONE)
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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struct esp32_touch_sensor_channel_config {
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int32_t channel_num;
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int32_t channel_sens;
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uint32_t zephyr_code;
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};
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struct esp32_touch_sensor_config {
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uint32_t debounce_interval_ms;
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int num_channels;
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int href_microvolt_enum_idx;
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int lref_microvolt_enum_idx;
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int href_atten_microvolt_enum_idx;
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int filter_mode;
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int filter_debounce_cnt;
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int filter_noise_thr;
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int filter_jitter_step;
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int filter_smooth_level;
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const struct esp32_touch_sensor_channel_config *channel_cfg;
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struct esp32_touch_sensor_channel_data *channel_data;
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};
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struct esp32_touch_sensor_channel_data {
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const struct device *dev;
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struct k_work_delayable work;
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uint32_t status;
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#if defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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uint32_t last_status;
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#endif /* defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3) */
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};
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struct esp32_touch_sensor_data {
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uint32_t rtc_intr_msk;
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};
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static void esp32_touch_sensor_interrupt_cb(void *arg)
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{
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const struct device *dev = arg;
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struct esp32_touch_sensor_data *dev_data = dev->data;
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const struct esp32_touch_sensor_config *dev_cfg = dev->config;
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const struct esp32_touch_sensor_channel_config *channel_cfg;
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const int num_channels = dev_cfg->num_channels;
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uint32_t pad_status;
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#if defined(CONFIG_SOC_SERIES_ESP32)
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touch_hal_intr_clear();
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#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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static uint8_t scan_done_counter;
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touch_pad_intr_mask_t intr_mask = touch_hal_read_intr_status_mask();
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if (intr_mask & TOUCH_PAD_INTR_MASK_SCAN_DONE) {
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if (++scan_done_counter == ESP32_SCAN_DONE_MAX_COUNT) {
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touch_hal_intr_disable(TOUCH_PAD_INTR_MASK_SCAN_DONE);
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for (int i = 0; i < num_channels; i++) {
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channel_cfg = &dev_cfg->channel_cfg[i];
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/* Set interrupt threshold */
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uint32_t benchmark_value;
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touch_hal_read_benchmark(channel_cfg->channel_num,
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&benchmark_value);
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touch_hal_set_threshold(channel_cfg->channel_num,
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channel_cfg->channel_sens * benchmark_value / 100);
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}
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}
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return;
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}
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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touch_hal_read_trigger_status_mask(&pad_status);
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#if defined(CONFIG_SOC_SERIES_ESP32)
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touch_hal_clear_trigger_status_mask();
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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for (int i = 0; i < num_channels; i++) {
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uint32_t channel_status;
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channel_cfg = &dev_cfg->channel_cfg[i];
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channel_status = (pad_status >> channel_cfg->channel_num) & 0x01;
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#if defined(CONFIG_SOC_SERIES_ESP32)
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if (channel_status != 0) {
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#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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uint32_t channel_num = (uint32_t)touch_hal_get_current_meas_channel();
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if (channel_cfg->channel_num == channel_num) {
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#endif /* CONFIG_SOC_SERIES_ESP32 */
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struct esp32_touch_sensor_channel_data
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*channel_data = &dev_cfg->channel_data[i];
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channel_data->status = channel_status;
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(void)k_work_reschedule(&channel_data->work,
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K_MSEC(dev_cfg->debounce_interval_ms));
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}
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}
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}
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static void esp32_rtc_isr(void *arg)
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{
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uint32_t status = REG_READ(RTC_CNTL_INT_ST_REG);
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if (arg != NULL) {
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const struct device *dev = arg;
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struct esp32_touch_sensor_data *dev_data = dev->data;
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if (dev_data->rtc_intr_msk & status) {
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esp32_touch_sensor_interrupt_cb(arg);
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}
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}
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REG_WRITE(RTC_CNTL_INT_CLR_REG, status);
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}
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static esp_err_t esp32_rtc_isr_install(intr_handler_t intr_handler, const void *handler_arg)
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{
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esp_err_t err;
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REG_WRITE(RTC_CNTL_INT_ENA_REG, 0);
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REG_WRITE(RTC_CNTL_INT_CLR_REG, UINT32_MAX);
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err = esp_intr_alloc(DT_IRQ_BY_IDX(DT_NODELABEL(touch), 0, irq),
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ESP_PRIO_TO_FLAGS(DT_IRQ_BY_IDX(DT_NODELABEL(touch), 0, priority)) |
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ESP_INT_FLAGS_CHECK(DT_IRQ_BY_IDX(DT_NODELABEL(touch), 0, flags)),
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intr_handler, (void *)handler_arg, NULL);
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return err;
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}
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/**
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* Handle debounced touch sensor touch state.
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*/
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static void esp32_touch_sensor_change_deferred(struct k_work *work)
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{
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struct k_work_delayable *dwork = k_work_delayable_from_work(work);
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struct esp32_touch_sensor_channel_data *channel_data =
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CONTAINER_OF(dwork, struct esp32_touch_sensor_channel_data, work);
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const struct device *dev = channel_data->dev;
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const struct esp32_touch_sensor_config *dev_cfg = dev->config;
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int key_index = channel_data - &dev_cfg->channel_data[0];
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const struct esp32_touch_sensor_channel_config
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*channel_cfg = &dev_cfg->channel_cfg[key_index];
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#if defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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if (channel_data->last_status != channel_data->status) {
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#endif /* defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3) */
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input_report_key(dev, channel_cfg->zephyr_code,
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channel_data->status, true, K_FOREVER);
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#if defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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channel_data->last_status = channel_data->status;
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}
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#endif /* defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3) */
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}
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static int esp32_touch_sensor_init(const struct device *dev)
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{
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struct esp32_touch_sensor_data *dev_data = dev->data;
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const struct esp32_touch_sensor_config *dev_cfg = dev->config;
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const int num_channels = dev_cfg->num_channels;
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touch_hal_init();
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#if defined(CONFIG_SOC_SERIES_ESP32)
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touch_hal_volt_t volt = {
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.refh = dev_cfg->href_microvolt_enum_idx,
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.refh = dev_cfg->href_microvolt_enum_idx,
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.atten = dev_cfg->href_atten_microvolt_enum_idx
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};
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touch_hal_set_voltage(&volt);
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touch_hal_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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for (int i = 0; i < num_channels; i++) {
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struct esp32_touch_sensor_channel_data *channel_data = &dev_cfg->channel_data[i];
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const struct esp32_touch_sensor_channel_config *channel_cfg =
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&dev_cfg->channel_cfg[i];
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if (!(channel_cfg->channel_num > 0 &&
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channel_cfg->channel_num < SOC_TOUCH_SENSOR_NUM)) {
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LOG_ERR("Touch %d configuration failed: "
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"Touch channel error", i);
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return -EINVAL;
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}
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#if defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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if (channel_cfg->channel_num == SOC_TOUCH_DENOISE_CHANNEL) {
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LOG_ERR("Touch %d configuration failed: "
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"TOUCH0 is internal denoise channel", i);
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return -EINVAL;
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}
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#endif /* defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3) */
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gpio_num_t gpio_num = touch_sensor_channel_io_map[channel_cfg->channel_num];
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rtc_gpio_init(gpio_num);
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rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_DISABLED);
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rtc_gpio_pulldown_dis(gpio_num);
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rtc_gpio_pullup_dis(gpio_num);
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touch_hal_config(channel_cfg->channel_num);
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#if defined(CONFIG_SOC_SERIES_ESP32)
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touch_hal_set_threshold(channel_cfg->channel_num, 0);
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touch_hal_set_group_mask(BIT(channel_cfg->channel_num),
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BIT(channel_cfg->channel_num));
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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touch_hal_set_channel_mask(BIT(channel_cfg->channel_num));
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channel_data->status = 0;
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#if defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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channel_data->last_status = 0;
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#endif /* defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3) */
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channel_data->dev = dev;
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k_work_init_delayable(&channel_data->work, esp32_touch_sensor_change_deferred);
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}
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#if defined(CONFIG_SOC_SERIES_ESP32)
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for (int i = 0; i < num_channels; i++) {
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const struct esp32_touch_sensor_channel_config *channel_cfg =
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&dev_cfg->channel_cfg[i];
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uint32_t ref_time;
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ref_time = k_uptime_get_32();
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while (!touch_hal_meas_is_done()) {
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if (k_uptime_get_32() - ref_time > 500) {
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return -ETIMEDOUT;
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}
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k_busy_wait(1000);
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}
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uint16_t touch_value = touch_hal_read_raw_data(channel_cfg->channel_num);
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touch_hal_set_threshold(channel_cfg->channel_num,
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touch_value * (100 - channel_cfg->channel_num) / 100);
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}
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#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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touch_filter_config_t filter_info = {
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.mode = dev_cfg->filter_mode,
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.debounce_cnt = dev_cfg->filter_debounce_cnt,
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.noise_thr = dev_cfg->filter_noise_thr,
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.jitter_step = dev_cfg->filter_jitter_step,
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.smh_lvl = dev_cfg->filter_smooth_level,
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};
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touch_hal_filter_set_config(&filter_info);
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touch_hal_filter_enable();
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touch_hal_timeout_enable();
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touch_hal_timeout_set_threshold(SOC_TOUCH_PAD_THRESHOLD_MAX);
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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dev_data->rtc_intr_msk = ESP32_RTC_INTR_MSK;
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esp32_rtc_isr_install(&esp32_rtc_isr, dev);
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#if defined(CONFIG_SOC_SERIES_ESP32)
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touch_hal_intr_enable();
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#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
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touch_hal_intr_enable(ESP32_TOUCH_PAD_INTR_MASK);
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touch_hal_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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#endif /* defined(CONFIG_SOC_SERIES_ESP32) */
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touch_hal_start_fsm();
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return 0;
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}
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#define ESP32_TOUCH_SENSOR_CHANNEL_CFG_INIT(node_id) \
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{ \
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.channel_num = DT_PROP(node_id, channel_num), \
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.channel_sens = DT_PROP(node_id, channel_sens), \
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.zephyr_code = DT_PROP(node_id, zephyr_code), \
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}
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#define ESP32_TOUCH_SENSOR_INIT(inst) \
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static const struct esp32_touch_sensor_channel_config \
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esp32_touch_sensor_channel_config_##inst[] = { \
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DT_INST_FOREACH_CHILD_STATUS_OKAY_SEP(inst, \
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ESP32_TOUCH_SENSOR_CHANNEL_CFG_INIT, (,)) \
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}; \
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\
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static struct esp32_touch_sensor_channel_data esp32_touch_sensor_channel_data_##inst \
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[ARRAY_SIZE(esp32_touch_sensor_channel_config_##inst)]; \
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\
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static const struct esp32_touch_sensor_config esp32_touch_sensor_config_##inst = { \
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.debounce_interval_ms = DT_INST_PROP(inst, debounce_interval_ms), \
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.num_channels = ARRAY_SIZE(esp32_touch_sensor_channel_config_##inst), \
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.href_microvolt_enum_idx = DT_INST_ENUM_IDX(inst, href_microvolt), \
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.lref_microvolt_enum_idx = DT_INST_ENUM_IDX(inst, lref_microvolt), \
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.href_atten_microvolt_enum_idx = DT_INST_ENUM_IDX(inst, href_atten_microvolt), \
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.filter_mode = DT_INST_PROP(inst, filter_mode), \
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.filter_debounce_cnt = DT_INST_PROP(inst, filter_debounce_cnt), \
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.filter_noise_thr = DT_INST_PROP(inst, filter_noise_thr), \
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.filter_jitter_step = DT_INST_PROP(inst, filter_jitter_step), \
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.filter_smooth_level = DT_INST_PROP(inst, filter_smooth_level), \
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.channel_cfg = esp32_touch_sensor_channel_config_##inst, \
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.channel_data = esp32_touch_sensor_channel_data_##inst, \
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}; \
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\
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static struct esp32_touch_sensor_data esp32_touch_sensor_data_##inst; \
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\
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DEVICE_DT_INST_DEFINE(inst, \
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&esp32_touch_sensor_init, \
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NULL, \
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&esp32_touch_sensor_data_##inst, \
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&esp32_touch_sensor_config_##inst, \
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POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY, \
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NULL);
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DT_INST_FOREACH_STATUS_OKAY(ESP32_TOUCH_SENSOR_INIT)
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