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drivers: wifi: Add WiFi drivers for ESP hosted firmware.
This is a host driver for ESP32 chips running the esp-hosted firmware, which turns ESP32s into a WLAN/BT co-processor. Signed-off-by: Ibrahim Abdalkader <[email protected]>
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‎drivers/wifi/CMakeLists.txt

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@@ -20,6 +20,7 @@ endif() # CONFIG_BUILD_ONLY_NO_BLOBS
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add_subdirectory_ifdef(CONFIG_WIFI_ESP_AT esp_at)
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add_subdirectory_ifdef(CONFIG_WIFI_ESP32 esp32)
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add_subdirectory_ifdef(CONFIG_WIFI_ESP_HOSTED esp_hosted)
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add_subdirectory_ifdef(CONFIG_WIFI_ESWIFI eswifi)
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add_subdirectory_ifdef(CONFIG_WIFI_SIMPLELINK simplelink)
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add_subdirectory_ifdef(CONFIG_WIFI_WINC1500 winc1500)

‎drivers/wifi/Kconfig

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@@ -40,6 +40,7 @@ source "drivers/wifi/simplelink/Kconfig.simplelink"
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source "drivers/wifi/eswifi/Kconfig.eswifi"
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source "drivers/wifi/esp_at/Kconfig.esp_at"
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source "drivers/wifi/esp32/Kconfig.esp32"
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source "drivers/wifi/esp_hosted/Kconfig.esp_hosted"
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source "drivers/wifi/nxp/Kconfig.nxp"
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source "drivers/wifi/infineon/Kconfig.airoc"
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source "drivers/wifi/nrf_wifi/Kconfig.nrfwifi"

‎drivers/wifi/esp_hosted/CMakeLists.txt

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# Copyright (c) 2025 Arduino SA
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# SPDX-License-Identifier: Apache-2.0
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if (CONFIG_WIFI_ESP_HOSTED)
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zephyr_library_named(esp_hosted)
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list(APPEND CMAKE_MODULE_PATH ${ZEPHYR_BASE}/modules/nanopb)
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include(nanopb)
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zephyr_library_sources(
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esp_hosted_hal.c
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esp_hosted_wifi.c
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)
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zephyr_nanopb_sources(esp_hosted
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esp_hosted_proto.pb
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)
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zephyr_include_directories(
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./
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)
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zephyr_compile_definitions(
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PB_ENABLE_MALLOC=1
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)
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endif()

‎drivers/wifi/esp_hosted/Kconfig.esp_hosted

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# ESP Hosted WiFi driver options
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# Copyright (c) 2025 Arduino SA
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# SPDX-License-Identifier: Apache-2.0
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menuconfig WIFI_ESP_HOSTED
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bool "ESP_HOSTED driver support"
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depends on DT_HAS_ESPRESSIF_ESP_HOSTED_ENABLED
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default y
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select GPIO
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select SPI
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select WIFI_OFFLOAD
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select WIFI_NM
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select NANOPB
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select NET_L2_ETHERNET
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select NET_L2_WIFI_MGMT
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select WIFI_USE_NATIVE_NETWORKING
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if WIFI_ESP_HOSTED
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config WIFI_ESP_HOSTED_DEBUG
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bool "Enable extra debugging messages"
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help
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Enable stack debugging messages.
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config WIFI_ESP_HOSTED_EVENT_TASK_PRIORITY
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int "Event Task priority"
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default 4
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config WIFI_ESP_HOSTED_EVENT_TASK_STACK_SIZE
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int "Event Task Stack Size"
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default 16384
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config WIFI_ESP_HOSTED_AP_CLIENTS_MAX
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int "Max number of AP clients"
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default 5
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config WIFI_ESP_HOSTED_AP_CHANNEL_DEF
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int "Default AP channel"
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default 9
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endif

‎drivers/wifi/esp_hosted/esp_hosted_hal.c

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/*
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* Copyright (c) 2025 Arduino SA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdint.h>
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#include <string.h>
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#include <zephyr/kernel.h>
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#include "esp_hosted_wifi.h"
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(esp_hosted_hal, CONFIG_WIFI_LOG_LEVEL);
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int esp_hosted_hal_init(const struct device *dev)
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{
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const esp_hosted_config_t *config = dev->config;
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if (!spi_is_ready_dt(&config->spi_bus)) {
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LOG_ERR("SPI device is not ready");
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return -ENODEV;
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}
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// Configure pins.
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gpio_pin_configure_dt(&config->dataready_gpio, GPIO_OUTPUT);
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gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT);
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// Perform a hard-reset
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gpio_pin_set_dt(&config->dataready_gpio, 1);
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gpio_pin_set_dt(&config->reset_gpio, 0);
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k_msleep(100);
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gpio_pin_set_dt(&config->reset_gpio, 1);
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k_msleep(500);
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// Configure handshake/dataready pins.
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gpio_pin_configure_dt(&config->dataready_gpio, GPIO_INPUT);
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gpio_pin_configure_dt(&config->handshake_gpio, GPIO_INPUT);
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return 0;
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}
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bool esp_hosted_hal_data_ready(const struct device *dev)
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{
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const esp_hosted_config_t *config = dev->config;
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return gpio_pin_get_dt(&config->dataready_gpio);
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}
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int esp_hosted_hal_spi_transfer(const struct device *dev, void *tx, void *rx, uint32_t size)
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{
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int ret = 0;
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esp_hosted_data_t *data = dev->data;
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const esp_hosted_config_t *config = dev->config;
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const struct spi_buf tx_buf = {.buf = tx ? tx : rx, .len = size};
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const struct spi_buf_set tx_set = {.buffers = &tx_buf, .count = 1};
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const struct spi_buf rx_buf = {.buf = rx ? rx : tx, .len = size};
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const struct spi_buf_set rx_set = {.buffers = &rx_buf, .count = 1};
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// Wait for handshake pin to go high.
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for (uint64_t start = k_uptime_get();; k_msleep(1)) {
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if (gpio_pin_get_dt(&config->handshake_gpio) &&
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(rx == NULL || gpio_pin_get_dt(&config->dataready_gpio))) {
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break;
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}
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if ((k_uptime_get() - start) >= 100) { // k_uptime_delta(&start);
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return -ETIMEDOUT;
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}
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}
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if (k_sem_take(&data->bus_sem, K_FOREVER) != 0) {
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return -1;
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}
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// Transfer SPI buffers.
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if (spi_transceive_dt(&config->spi_bus, &tx_set, &rx_set)) {
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LOG_ERR("spi_transceive failed");
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ret = -EIO;
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}
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k_sem_give(&data->bus_sem);
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return ret;
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}

‎drivers/wifi/esp_hosted/esp_hosted_hal.h

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/*
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* Copyright (c) 2025 Arduino SA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef MICROPY_INCLUDED_DRIVERS_ESP_HOSTED_HAL_H
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#define MICROPY_INCLUDED_DRIVERS_ESP_HOSTED_HAL_H
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// HAL functions.
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int esp_hosted_hal_init(const struct device *dev);
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bool esp_hosted_hal_data_ready(const struct device *dev);
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int esp_hosted_hal_spi_transfer(const struct device *dev, void *tx, void *rx, uint32_t size);
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#endif // MICROPY_INCLUDED_DRIVERS_ESP_HOSTED_HAL_H

‎drivers/wifi/esp_hosted/esp_hosted_proto.options

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*.ssid max_size:32 max_length:31
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*.bssid max_size:17
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*.mac max_size:17
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*.pwd max_size:64 max_length:63
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*.entries type:FT_POINTER
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*.stations type:FT_POINTER
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*.init_data max_size:0
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esp_hosted_proto.pb max_size:256 max_count:64 anonymous_oneof:true type:FT_STATIC

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