[usb_uart] Implement USB Host mode UART (#8334)

esphome/components/usb_host/__init__.py

@@ -0,0 +1,64 @@
+import esphome.codegen as cg
+from esphome.components.esp32 import (
+    VARIANT_ESP32S2,
+    VARIANT_ESP32S3,
+    add_idf_sdkconfig_option,
+    only_on_variant,
+)
+import esphome.config_validation as cv
+from esphome.const import CONF_ID
+from esphome.cpp_types import Component
+
+AUTO_LOAD = ["bytebuffer"]
+CODEOWNERS = ["@clydebarrow"]
+DEPENDENCIES = ["esp32"]
+usb_host_ns = cg.esphome_ns.namespace("usb_host")
+USBHost = usb_host_ns.class_("USBHost", Component)
+USBClient = usb_host_ns.class_("USBClient", Component)
+
+CONF_DEVICES = "devices"
+CONF_VID = "vid"
+CONF_PID = "pid"
+
+
+def usb_device_schema(cls=USBClient, vid: int = None, pid: [int] = None) -> cv.Schema:
+    schema = cv.COMPONENT_SCHEMA.extend(
+        {
+            cv.GenerateID(): cv.declare_id(cls),
+        }
+    )
+    if vid:
+        schema = schema.extend({cv.Optional(CONF_VID, default=vid): cv.hex_uint16_t})
+    else:
+        schema = schema.extend({cv.Required(CONF_VID): cv.hex_uint16_t})
+    if pid:
+        schema = schema.extend({cv.Optional(CONF_PID, default=pid): cv.hex_uint16_t})
+    else:
+        schema = schema.extend({cv.Required(CONF_PID): cv.hex_uint16_t})
+    return schema
+
+
+CONFIG_SCHEMA = cv.All(
+    cv.COMPONENT_SCHEMA.extend(
+        {
+            cv.GenerateID(): cv.declare_id(USBHost),
+            cv.Optional(CONF_DEVICES): cv.ensure_list(usb_device_schema()),
+        }
+    ),
+    cv.only_with_esp_idf,
+    only_on_variant(supported=[VARIANT_ESP32S2, VARIANT_ESP32S3]),
+)
+
+
+async def register_usb_client(config):
+    var = cg.new_Pvariable(config[CONF_ID], config[CONF_VID], config[CONF_PID])
+    await cg.register_component(var, config)
+    return var
+
+
+async def to_code(config):
+    add_idf_sdkconfig_option("CONFIG_USB_HOST_CONTROL_TRANSFER_MAX_SIZE", 1024)
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    for device in config.get(CONF_DEVICES) or ():
+        await register_usb_client(device)

esphome/components/usb_host/usb_host.h

@@ -0,0 +1,116 @@
+#pragma once
+
+// Should not be needed, but it's required to pass CI clang-tidy checks
+#if defined(USE_ESP32_VARIANT_ESP32S2) || defined(USE_ESP32_VARIANT_ESP32S3)
+#include "esphome/core/component.h"
+#include <vector>
+#include "usb/usb_host.h"
+
+#include <list>
+
+namespace esphome {
+namespace usb_host {
+
+static const char *const TAG = "usb_host";
+
+// constants for setup packet type
+static const uint8_t USB_RECIP_DEVICE = 0;
+static const uint8_t USB_RECIP_INTERFACE = 1;
+static const uint8_t USB_RECIP_ENDPOINT = 2;
+static const uint8_t USB_TYPE_STANDARD = 0 << 5;
+static const uint8_t USB_TYPE_CLASS = 1 << 5;
+static const uint8_t USB_TYPE_VENDOR = 2 << 5;
+static const uint8_t USB_DIR_MASK = 1 << 7;
+static const uint8_t USB_DIR_IN = 1 << 7;
+static const uint8_t USB_DIR_OUT = 0;
+static const size_t SETUP_PACKET_SIZE = 8;
+
+static const size_t MAX_REQUESTS = 16;  // maximum number of outstanding requests possible.
+
+// used to report a transfer status
+struct TransferStatus {
+  bool success;
+  uint16_t error_code;
+  uint8_t *data;
+  size_t data_len;
+  uint8_t endpoint;
+  void *user_data;
+};
+
+using transfer_cb_t = std::function<void(const TransferStatus &)>;
+
+class USBClient;
+
+// struct used to capture all data needed for a transfer
+struct TransferRequest {
+  usb_transfer_t *transfer;
+  transfer_cb_t callback;
+  TransferStatus status;
+  USBClient *client;
+};
+
+// callback function type.
+
+enum ClientState {
+  USB_CLIENT_INIT = 0,
+  USB_CLIENT_OPEN,
+  USB_CLIENT_CLOSE,
+  USB_CLIENT_GET_DESC,
+  USB_CLIENT_GET_INFO,
+  USB_CLIENT_CONNECTED,
+};
+class USBClient : public Component {
+  friend class USBHost;
+
+ public:
+  USBClient(uint16_t vid, uint16_t pid) : vid_(vid), pid_(pid) { init_pool(); }
+
+  void init_pool() {
+    this->trq_pool_.clear();
+    for (size_t i = 0; i != MAX_REQUESTS; i++)
+      this->trq_pool_.push_back(&this->requests_[i]);
+  }
+  void setup() override;
+  void loop() override;
+  // setup must happen after the host bus has been setup
+  float get_setup_priority() const override { return setup_priority::IO; }
+  void on_opened(uint8_t addr);
+  void on_removed(usb_device_handle_t handle);
+  void control_transfer_callback(const usb_transfer_t *xfer) const;
+  void transfer_in(uint8_t ep_address, const transfer_cb_t &callback, uint16_t length);
+  void transfer_out(uint8_t ep_address, const transfer_cb_t &callback, const uint8_t *data, uint16_t length);
+  void dump_config() override;
+  void release_trq(TransferRequest *trq);
+  bool control_transfer(uint8_t type, uint8_t request, uint16_t value, uint16_t index, const transfer_cb_t &callback,
+                        const std::vector<uint8_t> &data = {});
+
+ protected:
+  bool register_();
+  TransferRequest *get_trq_();
+  virtual void disconnect();
+  virtual void on_connected() {}
+  virtual void on_disconnected() { this->init_pool(); }
+
+  usb_host_client_handle_t handle_{};
+  usb_device_handle_t device_handle_{};
+  int device_addr_{-1};
+  int state_{USB_CLIENT_INIT};
+  uint16_t vid_{};
+  uint16_t pid_{};
+  std::list<TransferRequest *> trq_pool_{};
+  TransferRequest requests_[MAX_REQUESTS]{};
+};
+class USBHost : public Component {
+ public:
+  float get_setup_priority() const override { return setup_priority::BUS; }
+  void loop() override;
+  void setup() override;
+
+ protected:
+  std::vector<USBClient *> clients_{};
+};
+
+}  // namespace usb_host
+}  // namespace esphome
+
+#endif  // USE_ESP32_VARIANT_ESP32S2 || USE_ESP32_VARIANT_ESP32S3

esphome/components/usb_host/usb_host_client.cpp

@@ -0,0 +1,392 @@
+// Should not be needed, but it's required to pass CI clang-tidy checks
+#if defined(USE_ESP32_VARIANT_ESP32S2) || defined(USE_ESP32_VARIANT_ESP32S3)
+#include "usb_host.h"
+#include "esphome/core/log.h"
+#include "esphome/core/hal.h"
+#include "esphome/components/bytebuffer/bytebuffer.h"
+
+#include <cinttypes>
+#include <cstring>
+namespace esphome {
+namespace usb_host {
+
+#pragma GCC diagnostic ignored "-Wparentheses"
+
+using namespace bytebuffer;
+
+#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
+static void print_ep_desc(const usb_ep_desc_t *ep_desc) {
+  const char *ep_type_str;
+  int type = ep_desc->bmAttributes & USB_BM_ATTRIBUTES_XFERTYPE_MASK;
+
+  switch (type) {
+    case USB_BM_ATTRIBUTES_XFER_CONTROL:
+      ep_type_str = "CTRL";
+      break;
+    case USB_BM_ATTRIBUTES_XFER_ISOC:
+      ep_type_str = "ISOC";
+      break;
+    case USB_BM_ATTRIBUTES_XFER_BULK:
+      ep_type_str = "BULK";
+      break;
+    case USB_BM_ATTRIBUTES_XFER_INT:
+      ep_type_str = "INT";
+      break;
+    default:
+      ep_type_str = NULL;
+      break;
+  }
+
+  ESP_LOGV(TAG, "\t\t*** Endpoint descriptor ***");
+  ESP_LOGV(TAG, "\t\tbLength %d", ep_desc->bLength);
+  ESP_LOGV(TAG, "\t\tbDescriptorType %d", ep_desc->bDescriptorType);
+  ESP_LOGV(TAG, "\t\tbEndpointAddress 0x%x\tEP %d %s", ep_desc->bEndpointAddress, USB_EP_DESC_GET_EP_NUM(ep_desc),
+           USB_EP_DESC_GET_EP_DIR(ep_desc) ? "IN" : "OUT");
+  ESP_LOGV(TAG, "\t\tbmAttributes 0x%x\t%s", ep_desc->bmAttributes, ep_type_str);
+  ESP_LOGV(TAG, "\t\twMaxPacketSize %d", ep_desc->wMaxPacketSize);
+  ESP_LOGV(TAG, "\t\tbInterval %d", ep_desc->bInterval);
+}
+
+static void usbh_print_intf_desc(const usb_intf_desc_t *intf_desc) {
+  ESP_LOGV(TAG, "\t*** Interface descriptor ***");
+  ESP_LOGV(TAG, "\tbLength %d", intf_desc->bLength);
+  ESP_LOGV(TAG, "\tbDescriptorType %d", intf_desc->bDescriptorType);
+  ESP_LOGV(TAG, "\tbInterfaceNumber %d", intf_desc->bInterfaceNumber);
+  ESP_LOGV(TAG, "\tbAlternateSetting %d", intf_desc->bAlternateSetting);
+  ESP_LOGV(TAG, "\tbNumEndpoints %d", intf_desc->bNumEndpoints);
+  ESP_LOGV(TAG, "\tbInterfaceClass 0x%x", intf_desc->bInterfaceProtocol);
+  ESP_LOGV(TAG, "\tiInterface %d", intf_desc->iInterface);
+}
+
+static void usbh_print_cfg_desc(const usb_config_desc_t *cfg_desc) {
+  ESP_LOGV(TAG, "*** Configuration descriptor ***");
+  ESP_LOGV(TAG, "bLength %d", cfg_desc->bLength);
+  ESP_LOGV(TAG, "bDescriptorType %d", cfg_desc->bDescriptorType);
+  ESP_LOGV(TAG, "wTotalLength %d", cfg_desc->wTotalLength);
+  ESP_LOGV(TAG, "bNumInterfaces %d", cfg_desc->bNumInterfaces);
+  ESP_LOGV(TAG, "bConfigurationValue %d", cfg_desc->bConfigurationValue);
+  ESP_LOGV(TAG, "iConfiguration %d", cfg_desc->iConfiguration);
+  ESP_LOGV(TAG, "bmAttributes 0x%x", cfg_desc->bmAttributes);
+  ESP_LOGV(TAG, "bMaxPower %dmA", cfg_desc->bMaxPower * 2);
+}
+
+void usb_client_print_device_descriptor(const usb_device_desc_t *devc_desc) {
+  if (devc_desc == NULL) {
+    return;
+  }
+
+  ESP_LOGV(TAG, "*** Device descriptor ***");
+  ESP_LOGV(TAG, "bLength %d", devc_desc->bLength);
+  ESP_LOGV(TAG, "bDescriptorType %d", devc_desc->bDescriptorType);
+  ESP_LOGV(TAG, "bcdUSB %d.%d0", ((devc_desc->bcdUSB >> 8) & 0xF), ((devc_desc->bcdUSB >> 4) & 0xF));
+  ESP_LOGV(TAG, "bDeviceClass 0x%x", devc_desc->bDeviceClass);
+  ESP_LOGV(TAG, "bDeviceSubClass 0x%x", devc_desc->bDeviceSubClass);
+  ESP_LOGV(TAG, "bDeviceProtocol 0x%x", devc_desc->bDeviceProtocol);
+  ESP_LOGV(TAG, "bMaxPacketSize0 %d", devc_desc->bMaxPacketSize0);
+  ESP_LOGV(TAG, "idVendor 0x%x", devc_desc->idVendor);
+  ESP_LOGV(TAG, "idProduct 0x%x", devc_desc->idProduct);
+  ESP_LOGV(TAG, "bcdDevice %d.%d0", ((devc_desc->bcdDevice >> 8) & 0xF), ((devc_desc->bcdDevice >> 4) & 0xF));
+  ESP_LOGV(TAG, "iManufacturer %d", devc_desc->iManufacturer);
+  ESP_LOGV(TAG, "iProduct %d", devc_desc->iProduct);
+  ESP_LOGV(TAG, "iSerialNumber %d", devc_desc->iSerialNumber);
+  ESP_LOGV(TAG, "bNumConfigurations %d", devc_desc->bNumConfigurations);
+}
+
+void usb_client_print_config_descriptor(const usb_config_desc_t *cfg_desc,
+                                        print_class_descriptor_cb class_specific_cb) {
+  if (cfg_desc == nullptr) {
+    return;
+  }
+
+  int offset = 0;
+  uint16_t w_total_length = cfg_desc->wTotalLength;
+  const usb_standard_desc_t *next_desc = (const usb_standard_desc_t *) cfg_desc;
+
+  do {
+    switch (next_desc->bDescriptorType) {
+      case USB_W_VALUE_DT_CONFIG:
+        usbh_print_cfg_desc((const usb_config_desc_t *) next_desc);
+        break;
+      case USB_W_VALUE_DT_INTERFACE:
+        usbh_print_intf_desc((const usb_intf_desc_t *) next_desc);
+        break;
+      case USB_W_VALUE_DT_ENDPOINT:
+        print_ep_desc((const usb_ep_desc_t *) next_desc);
+        break;
+      default:
+        if (class_specific_cb) {
+          class_specific_cb(next_desc);
+        }
+        break;
+    }
+
+    next_desc = usb_parse_next_descriptor(next_desc, w_total_length, &offset);
+
+  } while (next_desc != NULL);
+}
+#endif
+static std::string get_descriptor_string(const usb_str_desc_t *desc) {
+  char buffer[256];
+  if (desc == nullptr)
+    return "(unknown)";
+  char *p = buffer;
+  for (size_t i = 0; i != desc->bLength / 2; i++) {
+    auto c = desc->wData[i];
+    if (c < 0x100)
+      *p++ = static_cast<char>(c);
+  }
+  *p = '\0';
+  return {buffer};
+}
+
+static void client_event_cb(const usb_host_client_event_msg_t *event_msg, void *ptr) {
+  auto *client = static_cast<USBClient *>(ptr);
+  switch (event_msg->event) {
+    case USB_HOST_CLIENT_EVENT_NEW_DEV: {
+      auto addr = event_msg->new_dev.address;
+      ESP_LOGD(TAG, "New device %d", event_msg->new_dev.address);
+      client->on_opened(addr);
+      break;
+    }
+    case USB_HOST_CLIENT_EVENT_DEV_GONE: {
+      client->on_removed(event_msg->dev_gone.dev_hdl);
+      ESP_LOGD(TAG, "Device gone %d", event_msg->new_dev.address);
+      break;
+    }
+    default:
+      ESP_LOGD(TAG, "Unknown event %d", event_msg->event);
+      break;
+  }
+}
+void USBClient::setup() {
+  usb_host_client_config_t config{.is_synchronous = false,
+                                  .max_num_event_msg = 5,
+                                  .async = {.client_event_callback = client_event_cb, .callback_arg = this}};
+  auto err = usb_host_client_register(&config, &this->handle_);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "client register failed: %s", esp_err_to_name(err));
+    this->status_set_error("Client register failed");
+    this->mark_failed();
+    return;
+  }
+  for (auto trq : this->trq_pool_) {
+    usb_host_transfer_alloc(64, 0, &trq->transfer);
+    trq->client = this;
+  }
+  ESP_LOGCONFIG(TAG, "client setup complete");
+}
+
+void USBClient::loop() {
+  switch (this->state_) {
+    case USB_CLIENT_OPEN: {
+      int err;
+      ESP_LOGD(TAG, "Open device %d", this->device_addr_);
+      err = usb_host_device_open(this->handle_, this->device_addr_, &this->device_handle_);
+      if (err != ESP_OK) {
+        ESP_LOGW(TAG, "Device open failed: %s", esp_err_to_name(err));
+        this->state_ = USB_CLIENT_INIT;
+        break;
+      }
+      ESP_LOGD(TAG, "Get descriptor device %d", this->device_addr_);
+      const usb_device_desc_t *desc;
+      err = usb_host_get_device_descriptor(this->device_handle_, &desc);
+      if (err != ESP_OK) {
+        ESP_LOGW(TAG, "Device get_desc failed: %s", esp_err_to_name(err));
+        this->disconnect();
+      } else {
+        ESP_LOGD(TAG, "Device descriptor: vid %X pid %X", desc->idVendor, desc->idProduct);
+        if (desc->idVendor == this->vid_ && desc->idProduct == this->pid_ || this->vid_ == 0 && this->pid_ == 0) {
+          usb_device_info_t dev_info;
+          if ((err = usb_host_device_info(this->device_handle_, &dev_info)) != ESP_OK) {
+            ESP_LOGW(TAG, "Device info failed: %s", esp_err_to_name(err));
+            this->disconnect();
+            break;
+          }
+          this->state_ = USB_CLIENT_CONNECTED;
+          ESP_LOGD(TAG, "Device connected: Manuf: %s; Prod: %s; Serial: %s",
+                   get_descriptor_string(dev_info.str_desc_manufacturer).c_str(),
+                   get_descriptor_string(dev_info.str_desc_product).c_str(),
+                   get_descriptor_string(dev_info.str_desc_serial_num).c_str());
+
+#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
+          const usb_device_desc_t *device_desc;
+          err = usb_host_get_device_descriptor(this->device_handle_, &device_desc);
+          if (err == ESP_OK)
+            usb_client_print_device_descriptor(device_desc);
+          const usb_config_desc_t *config_desc;
+          err = usb_host_get_active_config_descriptor(this->device_handle_, &config_desc);
+          if (err == ESP_OK)
+            usb_client_print_config_descriptor(config_desc, nullptr);
+#endif
+          this->on_connected();
+        } else {
+          ESP_LOGD(TAG, "Not our device, closing");
+          this->disconnect();
+        }
+      }
+      break;
+    }
+
+    default:
+      usb_host_client_handle_events(this->handle_, 0);
+      break;
+  }
+}
+
+void USBClient::on_opened(uint8_t addr) {
+  if (this->state_ == USB_CLIENT_INIT) {
+    this->device_addr_ = addr;
+    this->state_ = USB_CLIENT_OPEN;
+  }
+}
+void USBClient::on_removed(usb_device_handle_t handle) {
+  if (this->device_handle_ == handle) {
+    this->disconnect();
+  }
+}
+
+static void control_callback(const usb_transfer_t *xfer) {
+  auto *trq = static_cast<TransferRequest *>(xfer->context);
+  trq->status.error_code = xfer->status;
+  trq->status.success = xfer->status == USB_TRANSFER_STATUS_COMPLETED;
+  trq->status.endpoint = xfer->bEndpointAddress;
+  trq->status.data = xfer->data_buffer;
+  trq->status.data_len = xfer->actual_num_bytes;
+  if (trq->callback != nullptr)
+    trq->callback(trq->status);
+  trq->client->release_trq(trq);
+}
+
+TransferRequest *USBClient::get_trq_() {
+  if (this->trq_pool_.empty()) {
+    ESP_LOGE(TAG, "Too many requests queued");
+    return nullptr;
+  }
+  auto *trq = this->trq_pool_.front();
+  this->trq_pool_.pop_front();
+  trq->client = this;
+  trq->transfer->context = trq;
+  trq->transfer->device_handle = this->device_handle_;
+  return trq;
+}
+void USBClient::disconnect() {
+  this->on_disconnected();
+  auto err = usb_host_device_close(this->handle_, this->device_handle_);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Device close failed: %s", esp_err_to_name(err));
+  }
+  this->state_ = USB_CLIENT_INIT;
+  this->device_handle_ = nullptr;
+  this->device_addr_ = -1;
+}
+
+bool USBClient::control_transfer(uint8_t type, uint8_t request, uint16_t value, uint16_t index,
+                                 const transfer_cb_t &callback, const std::vector<uint8_t> &data) {
+  auto *trq = this->get_trq_();
+  if (trq == nullptr)
+    return false;
+  auto length = data.size();
+  if (length > sizeof(trq->transfer->data_buffer_size) - SETUP_PACKET_SIZE) {
+    ESP_LOGE(TAG, "Control transfer data size too large: %u > %u", length,
+             sizeof(trq->transfer->data_buffer_size) - sizeof(usb_setup_packet_t));
+    this->release_trq(trq);
+    return false;
+  }
+  auto control_packet = ByteBuffer(SETUP_PACKET_SIZE, LITTLE);
+  control_packet.put_uint8(type);
+  control_packet.put_uint8(request);
+  control_packet.put_uint16(value);
+  control_packet.put_uint16(index);
+  control_packet.put_uint16(length);
+  memcpy(trq->transfer->data_buffer, control_packet.get_data().data(), SETUP_PACKET_SIZE);
+  if (length != 0 && !(type & USB_DIR_IN)) {
+    memcpy(trq->transfer->data_buffer + SETUP_PACKET_SIZE, data.data(), length);
+  }
+  trq->callback = callback;
+  trq->transfer->bEndpointAddress = type & USB_DIR_MASK;
+  trq->transfer->num_bytes = static_cast<int>(length + SETUP_PACKET_SIZE);
+  trq->transfer->callback = reinterpret_cast<usb_transfer_cb_t>(control_callback);
+  auto err = usb_host_transfer_submit_control(this->handle_, trq->transfer);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to submit control transfer, err=%s", esp_err_to_name(err));
+    this->release_trq(trq);
+    return false;
+  }
+  return true;
+}
+
+static void transfer_callback(usb_transfer_t *xfer) {
+  auto *trq = static_cast<TransferRequest *>(xfer->context);
+  trq->status.error_code = xfer->status;
+  trq->status.success = xfer->status == USB_TRANSFER_STATUS_COMPLETED;
+  trq->status.endpoint = xfer->bEndpointAddress;
+  trq->status.data = xfer->data_buffer;
+  trq->status.data_len = xfer->actual_num_bytes;
+  if (trq->callback != nullptr)
+    trq->callback(trq->status);
+  trq->client->release_trq(trq);
+}
+/**
+ * Performs a transfer input operation.
+ *
+ * @param ep_address The endpoint address.
+ * @param callback The callback function to be called when the transfer is complete.
+ * @param length The length of the data to be transferred.
+ *
+ * @throws None.
+ */
+void USBClient::transfer_in(uint8_t ep_address, const transfer_cb_t &callback, uint16_t length) {
+  auto trq = this->get_trq_();
+  if (trq == nullptr) {
+    ESP_LOGE(TAG, "Too many requests queued");
+    return;
+  }
+  trq->callback = callback;
+  trq->transfer->callback = transfer_callback;
+  trq->transfer->bEndpointAddress = ep_address | USB_DIR_IN;
+  trq->transfer->num_bytes = length;
+  auto err = usb_host_transfer_submit(trq->transfer);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to submit transfer, address=%x, length=%d, err=%x", ep_address, length, err);
+    this->release_trq(trq);
+    this->disconnect();
+  }
+}
+
+/**
+ * Performs an output transfer operation.
+ *
+ * @param ep_address The endpoint address.
+ * @param callback The callback function to be called when the transfer is complete.
+ * @param data The data to be transferred.
+ * @param length The length of the data to be transferred.
+ *
+ * @throws None.
+ */
+void USBClient::transfer_out(uint8_t ep_address, const transfer_cb_t &callback, const uint8_t *data, uint16_t length) {
+  auto trq = this->get_trq_();
+  if (trq == nullptr) {
+    ESP_LOGE(TAG, "Too many requests queued");
+    return;
+  }
+  trq->callback = callback;
+  trq->transfer->callback = transfer_callback;
+  trq->transfer->bEndpointAddress = ep_address | USB_DIR_OUT;
+  trq->transfer->num_bytes = length;
+  memcpy(trq->transfer->data_buffer, data, length);
+  auto err = usb_host_transfer_submit(trq->transfer);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to submit transfer, address=%x, length=%d, err=%x", ep_address, length, err);
+    this->release_trq(trq);
+  }
+}
+void USBClient::dump_config() {
+  ESP_LOGCONFIG(TAG, "USBClient");
+  ESP_LOGCONFIG(TAG, "  Vendor id %04X", this->vid_);
+  ESP_LOGCONFIG(TAG, "  Product id %04X", this->pid_);
+}
+void USBClient::release_trq(TransferRequest *trq) { this->trq_pool_.push_back(trq); }
+
+}  // namespace usb_host
+}  // namespace esphome
+#endif  // USE_ESP32_VARIANT_ESP32S2 || USE_ESP32_VARIANT_ESP32S3

esphome/components/usb_host/usb_host_component.cpp

@@ -0,0 +1,35 @@
+// Should not be needed, but it's required to pass CI clang-tidy checks
+#if defined(USE_ESP32_VARIANT_ESP32S2) || defined(USE_ESP32_VARIANT_ESP32S3)
+#include "usb_host.h"
+#include <cinttypes>
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace usb_host {
+
+void USBHost::setup() {
+  ESP_LOGCONFIG(TAG, "Setup starts");
+  usb_host_config_t config{};
+
+  if (usb_host_install(&config) != ESP_OK) {
+    this->status_set_error("usb_host_install failed");
+    this->mark_failed();
+    return;
+  }
+}
+void USBHost::loop() {
+  int err;
+  uint32_t event_flags;
+  err = usb_host_lib_handle_events(0, &event_flags);
+  if (err != ESP_OK && err != ESP_ERR_TIMEOUT) {
+    ESP_LOGD(TAG, "lib_handle_events failed failed: %s", esp_err_to_name(err));
+  }
+  if (event_flags != 0) {
+    ESP_LOGD(TAG, "Event flags %" PRIu32 "X", event_flags);
+  }
+}
+
+}  // namespace usb_host
+}  // namespace esphome
+
+#endif  // USE_ESP32_VARIANT_ESP32S2 || USE_ESP32_VARIANT_ESP32S3