feat(drivers/usb): add a USB device stack
Add a new USB framework to manage an USB device profile (USBD)
based on a peripheral controller driver (PCD).
This USB stack can be use to implement any Universal Serial Bus Device
Class in TF-A on top of a USB driver defined in the platform.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I7971ec6d952edec3511157a198e6e5359df4346b
diff --git a/drivers/usb/usb_device.c b/drivers/usb/usb_device.c
new file mode 100644
index 0000000..ce02d4f
--- /dev/null
+++ b/drivers/usb/usb_device.c
@@ -0,0 +1,840 @@
+/*
+ * Copyright (c) 2021, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <drivers/usb_device.h>
+
+/* Define for EP address */
+#define EP_DIR_MASK BIT(7)
+#define EP_DIR_IN BIT(7)
+#define EP_NUM_MASK GENMASK(3, 0)
+
+#define EP0_IN (0U | EP_DIR_IN)
+#define EP0_OUT 0U
+
+/* USB address between 1 through 127 = 0x7F mask */
+#define ADDRESS_MASK GENMASK(6, 0)
+
+/*
+ * Set a STALL condition over an endpoint
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * return : status
+ */
+static enum usb_status usb_core_set_stall(struct usb_handle *pdev, uint8_t ep_addr)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ if ((EP_DIR_MASK & ep_addr) == EP_DIR_IN) {
+ ep = &hpcd->in_ep[num];
+ ep->is_in = true;
+ } else {
+ ep = &hpcd->out_ep[num];
+ ep->is_in = false;
+ }
+ ep->num = num;
+
+ pdev->driver->ep_set_stall(hpcd->instance, ep);
+ if (num == 0U) {
+ pdev->driver->ep0_out_start(hpcd->instance);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_get_desc
+ * Handle Get Descriptor requests
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_get_desc(struct usb_handle *pdev, struct usb_setup_req *req)
+{
+ uint16_t len;
+ uint8_t *pbuf;
+ uint8_t desc_type = HIBYTE(req->value);
+ uint8_t desc_idx = LOBYTE(req->value);
+
+ switch (desc_type) {
+ case USB_DESC_TYPE_DEVICE:
+ pbuf = pdev->desc->get_device_desc(&len);
+ break;
+
+ case USB_DESC_TYPE_CONFIGURATION:
+ pbuf = (uint8_t *)pdev->desc->get_config_desc(&len);
+ pbuf[1] = USB_DESC_TYPE_CONFIGURATION;
+ break;
+
+ case USB_DESC_TYPE_STRING:
+ switch (desc_idx) {
+ case USBD_IDX_LANGID_STR:
+ pbuf = pdev->desc->get_lang_id_desc(&len);
+ break;
+
+ case USBD_IDX_MFC_STR:
+ pbuf = pdev->desc->get_manufacturer_desc(&len);
+ break;
+
+ case USBD_IDX_PRODUCT_STR:
+ pbuf = pdev->desc->get_product_desc(&len);
+ break;
+
+ case USBD_IDX_SERIAL_STR:
+ pbuf = pdev->desc->get_serial_desc(&len);
+ break;
+
+ case USBD_IDX_CONFIG_STR:
+ pbuf = pdev->desc->get_configuration_desc(&len);
+ break;
+
+ case USBD_IDX_INTERFACE_STR:
+ pbuf = pdev->desc->get_interface_desc(&len);
+ break;
+
+ /* For all USER string */
+ case USBD_IDX_USER0_STR:
+ default:
+ pbuf = pdev->desc->get_usr_desc(desc_idx - USBD_IDX_USER0_STR, &len);
+ break;
+ }
+ break;
+
+ case USB_DESC_TYPE_DEVICE_QUALIFIER:
+ pbuf = (uint8_t *)pdev->desc->get_device_qualifier_desc(&len);
+ break;
+
+ case USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION:
+ pbuf = (uint8_t *)pdev->desc->get_config_desc(&len);
+ pbuf[1] = USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION;
+ break;
+
+ default:
+ ERROR("Unknown request %i\n", desc_type);
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ if ((len != 0U) && (req->length != 0U)) {
+ len = MIN(len, req->length);
+
+ /* Start the transfer */
+ usb_core_transmit_ep0(pdev, pbuf, len);
+ }
+}
+
+/*
+ * usb_core_set_config
+ * Handle Set device configuration request
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_set_config(struct usb_handle *pdev, struct usb_setup_req *req)
+{
+ static uint8_t cfgidx;
+
+ cfgidx = LOBYTE(req->value);
+
+ if (cfgidx > USBD_MAX_NUM_CONFIGURATION) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ switch (pdev->dev_state) {
+ case USBD_STATE_ADDRESSED:
+ if (cfgidx != 0U) {
+ pdev->dev_config = cfgidx;
+ pdev->dev_state = USBD_STATE_CONFIGURED;
+ if (!pdev->class) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ /* Set configuration and Start the Class */
+ if (pdev->class->init(pdev, cfgidx) != 0U) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ }
+ break;
+
+ case USBD_STATE_CONFIGURED:
+ if (cfgidx == 0U) {
+ pdev->dev_state = USBD_STATE_ADDRESSED;
+ pdev->dev_config = cfgidx;
+ pdev->class->de_init(pdev, cfgidx);
+ } else if (cfgidx != pdev->dev_config) {
+ if (pdev->class != NULL) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ /* Clear old configuration */
+ pdev->class->de_init(pdev, pdev->dev_config);
+ /* Set new configuration */
+ pdev->dev_config = cfgidx;
+ /* Set configuration and start the USB class */
+ if (pdev->class->init(pdev, cfgidx) != 0U) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ }
+ break;
+
+ default:
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ /* Send status */
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+}
+
+/*
+ * usb_core_get_status
+ * Handle Get Status request
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_get_status(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ if ((pdev->dev_state != USBD_STATE_ADDRESSED) &&
+ (pdev->dev_state != USBD_STATE_CONFIGURED)) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ pdev->dev_config_status = USB_CONFIG_SELF_POWERED;
+
+ if (pdev->dev_remote_wakeup != 0U) {
+ pdev->dev_config_status |= USB_CONFIG_REMOTE_WAKEUP;
+ }
+
+ /* Start the transfer */
+ usb_core_transmit_ep0(pdev, (uint8_t *)&pdev->dev_config_status, 2U);
+}
+
+/*
+ * usb_core_set_address
+ * Set device address
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_set_address(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ uint8_t dev_addr;
+
+ if ((req->index != 0U) || (req->length != 0U)) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ dev_addr = req->value & ADDRESS_MASK;
+ if (pdev->dev_state != USBD_STATE_DEFAULT) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ pdev->dev_address = dev_addr;
+ pdev->driver->set_address(((struct pcd_handle *)(pdev->data))->instance, dev_addr);
+
+ /* Send status */
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+
+ if (dev_addr != 0U) {
+ pdev->dev_state = USBD_STATE_ADDRESSED;
+ } else {
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ }
+}
+
+/*
+ * usb_core_dev_req
+ * Handle standard usb device requests
+ * pdev : device instance
+ * req : usb request
+ * return : status
+ */
+static enum usb_status usb_core_dev_req(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ VERBOSE("receive request %i\n", req->b_request);
+ switch (req->b_request) {
+ case USB_REQ_GET_DESCRIPTOR:
+ usb_core_get_desc(pdev, req);
+ break;
+
+ case USB_REQ_SET_CONFIGURATION:
+ usb_core_set_config(pdev, req);
+ break;
+
+ case USB_REQ_GET_STATUS:
+ usb_core_get_status(pdev, req);
+ break;
+
+ case USB_REQ_SET_ADDRESS:
+ usb_core_set_address(pdev, req);
+ break;
+
+ case USB_REQ_GET_CONFIGURATION:
+ case USB_REQ_SET_FEATURE:
+ case USB_REQ_CLEAR_FEATURE:
+ default:
+ ERROR("NOT SUPPORTED %i\n", req->b_request);
+ usb_core_ctl_error(pdev);
+ break;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_itf_req
+ * Handle standard usb interface requests
+ * pdev : device instance
+ * req : usb request
+ * return : status
+ */
+static enum usb_status usb_core_itf_req(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ if (pdev->dev_state != USBD_STATE_CONFIGURED) {
+ usb_core_ctl_error(pdev);
+ return USBD_OK;
+ }
+
+ if (LOBYTE(req->index) <= USBD_MAX_NUM_INTERFACES) {
+ pdev->class->setup(pdev, req);
+
+ if (req->length == 0U) {
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+ }
+ } else {
+ usb_core_ctl_error(pdev);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_setup_stage
+ * Handle the setup stage
+ * pdev: device instance
+ * psetup : setup buffer
+ * return : status
+ */
+static enum usb_status usb_core_setup_stage(struct usb_handle *pdev,
+ uint8_t *psetup)
+{
+ struct usb_setup_req *req = &pdev->request;
+
+ /* Copy setup buffer into req structure */
+ req->bm_request = psetup[0];
+ req->b_request = psetup[1];
+ req->value = psetup[2] + (psetup[3] << 8);
+ req->index = psetup[4] + (psetup[5] << 8);
+ req->length = psetup[6] + (psetup[7] << 8);
+
+ pdev->ep0_state = USBD_EP0_SETUP;
+ pdev->ep0_data_len = pdev->request.length;
+
+ switch (pdev->request.bm_request & USB_REQ_RECIPIENT_MASK) {
+ case USB_REQ_RECIPIENT_DEVICE:
+ usb_core_dev_req(pdev, &pdev->request);
+ break;
+
+ case USB_REQ_RECIPIENT_INTERFACE:
+ usb_core_itf_req(pdev, &pdev->request);
+ break;
+
+ case USB_REQ_RECIPIENT_ENDPOINT:
+ default:
+ ERROR("receive unsupported request %i",
+ pdev->request.bm_request & USB_REQ_RECIPIENT_MASK);
+ usb_core_set_stall(pdev, pdev->request.bm_request & USB_REQ_DIRECTION);
+ return USBD_FAIL;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_data_out
+ * Handle data OUT stage
+ * pdev: device instance
+ * epnum: endpoint index
+ * pdata: buffer to sent
+ * return : status
+ */
+static enum usb_status usb_core_data_out(struct usb_handle *pdev, uint8_t epnum,
+ uint8_t *pdata)
+{
+ struct usb_endpoint *pep;
+
+ if (epnum == 0U) {
+ pep = &pdev->ep_out[0];
+ if (pdev->ep0_state == USBD_EP0_DATA_OUT) {
+ if (pep->rem_length > pep->maxpacket) {
+ pep->rem_length -= pep->maxpacket;
+
+ usb_core_receive(pdev, 0U, pdata,
+ MIN(pep->rem_length,
+ pep->maxpacket));
+ } else {
+ if (pdev->class->ep0_rx_ready &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->ep0_rx_ready(pdev);
+ }
+
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+ }
+ }
+ } else if (pdev->class->data_out != NULL &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->data_out(pdev, epnum);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_data_in
+ * Handle data in stage
+ * pdev: device instance
+ * epnum: endpoint index
+ * pdata: buffer to fill
+ * return : status
+ */
+static enum usb_status usb_core_data_in(struct usb_handle *pdev, uint8_t epnum,
+ uint8_t *pdata)
+{
+ if (epnum == 0U) {
+ struct usb_endpoint *pep = &pdev->ep_in[0];
+
+ if (pdev->ep0_state == USBD_EP0_DATA_IN) {
+ if (pep->rem_length > pep->maxpacket) {
+ pep->rem_length -= pep->maxpacket;
+
+ usb_core_transmit(pdev, 0U, pdata,
+ pep->rem_length);
+
+ /* Prepare EP for premature end of transfer */
+ usb_core_receive(pdev, 0U, NULL, 0U);
+ } else {
+ /* Last packet is MPS multiple, send ZLP packet */
+ if ((pep->total_length % pep->maxpacket == 0U) &&
+ (pep->total_length >= pep->maxpacket) &&
+ (pep->total_length < pdev->ep0_data_len)) {
+ usb_core_transmit(pdev, 0U, NULL, 0U);
+
+ pdev->ep0_data_len = 0U;
+
+ /* Prepare endpoint for premature end of transfer */
+ usb_core_receive(pdev, 0U, NULL, 0U);
+ } else {
+ if (pdev->class->ep0_tx_sent != NULL &&
+ (pdev->dev_state ==
+ USBD_STATE_CONFIGURED)) {
+ pdev->class->ep0_tx_sent(pdev);
+ }
+ /* Start the transfer */
+ usb_core_receive_ep0(pdev, NULL, 0U);
+ }
+ }
+ }
+ } else if ((pdev->class->data_in != NULL) &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->data_in(pdev, epnum);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_suspend
+ * Handle suspend event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_suspend(struct usb_handle *pdev)
+{
+ INFO("USB Suspend mode\n");
+ pdev->dev_old_state = pdev->dev_state;
+ pdev->dev_state = USBD_STATE_SUSPENDED;
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_resume
+ * Handle resume event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_resume(struct usb_handle *pdev)
+{
+ INFO("USB Resume\n");
+ pdev->dev_state = pdev->dev_old_state;
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_sof
+ * Handle SOF event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_sof(struct usb_handle *pdev)
+{
+ if (pdev->dev_state == USBD_STATE_CONFIGURED) {
+ if (pdev->class->sof != NULL) {
+ pdev->class->sof(pdev);
+ }
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_disconnect
+ * Handle device disconnection event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_disconnect(struct usb_handle *pdev)
+{
+ /* Free class resources */
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ pdev->class->de_init(pdev, pdev->dev_config);
+
+ return USBD_OK;
+}
+
+enum usb_status usb_core_handle_it(struct usb_handle *pdev)
+{
+ uint32_t param = 0U;
+ uint32_t len = 0U;
+ struct usbd_ep *ep;
+
+ switch (pdev->driver->it_handler(pdev->data->instance, ¶m)) {
+ case USB_DATA_OUT:
+ usb_core_data_out(pdev, param,
+ pdev->data->out_ep[param].xfer_buff);
+ break;
+
+ case USB_DATA_IN:
+ usb_core_data_in(pdev, param,
+ pdev->data->in_ep[param].xfer_buff);
+ break;
+
+ case USB_SETUP:
+ usb_core_setup_stage(pdev, (uint8_t *)pdev->data->setup);
+ break;
+
+ case USB_ENUM_DONE:
+ break;
+
+ case USB_READ_DATA_PACKET:
+ ep = &pdev->data->out_ep[param & USBD_OUT_EPNUM_MASK];
+ len = (param & USBD_OUT_COUNT_MASK) >> USBD_OUT_COUNT_SHIFT;
+ pdev->driver->read_packet(pdev->data->instance,
+ ep->xfer_buff, len);
+ ep->xfer_buff += len;
+ ep->xfer_count += len;
+ break;
+
+ case USB_READ_SETUP_PACKET:
+ ep = &pdev->data->out_ep[param & USBD_OUT_EPNUM_MASK];
+ len = (param & USBD_OUT_COUNT_MASK) >> 0x10;
+ pdev->driver->read_packet(pdev->data->instance,
+ (uint8_t *)pdev->data->setup, 8);
+ ep->xfer_count += len;
+ break;
+
+ case USB_RESET:
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ break;
+
+ case USB_RESUME:
+ if (pdev->data->lpm_state == LPM_L1) {
+ pdev->data->lpm_state = LPM_L0;
+ } else {
+ usb_core_resume(pdev);
+ }
+ break;
+
+ case USB_SUSPEND:
+ usb_core_suspend(pdev);
+ break;
+
+ case USB_LPM:
+ if (pdev->data->lpm_state == LPM_L0) {
+ pdev->data->lpm_state = LPM_L1;
+ } else {
+ usb_core_suspend(pdev);
+ }
+ break;
+
+ case USB_SOF:
+ usb_core_sof(pdev);
+ break;
+
+ case USB_DISCONNECT:
+ usb_core_disconnect(pdev);
+ break;
+
+ case USB_WRITE_EMPTY:
+ pdev->driver->write_empty_tx_fifo(pdev->data->instance, param,
+ pdev->data->in_ep[param].xfer_len,
+ (uint32_t *)&pdev->data->in_ep[param].xfer_count,
+ pdev->data->in_ep[param].maxpacket,
+ &pdev->data->in_ep[param].xfer_buff);
+ break;
+
+ case USB_NOTHING:
+ default:
+ break;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_receive
+ * Receive an amount of data
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * buf: pointer to the reception buffer
+ * len: amount of data to be received
+ * return : status
+ */
+enum usb_status usb_core_receive(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *buf, uint32_t len)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ ep = &hpcd->out_ep[num];
+
+ /* Setup and start the Xfer */
+ ep->xfer_buff = buf;
+ ep->xfer_len = len;
+ ep->xfer_count = 0U;
+ ep->is_in = false;
+ ep->num = num;
+
+ if (num == 0U) {
+ pdev->driver->ep0_start_xfer(hpcd->instance, ep);
+ } else {
+ pdev->driver->ep_start_xfer(hpcd->instance, ep);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_transmit
+ * Send an amount of data
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * buf: pointer to the transmission buffer
+ * len: amount of data to be sent
+ * return : status
+ */
+enum usb_status usb_core_transmit(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *buf, uint32_t len)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ ep = &hpcd->in_ep[num];
+
+ /* Setup and start the Xfer */
+ ep->xfer_buff = buf;
+ ep->xfer_len = len;
+ ep->xfer_count = 0U;
+ ep->is_in = true;
+ ep->num = num;
+
+ if (num == 0U) {
+ pdev->driver->ep0_start_xfer(hpcd->instance, ep);
+ } else {
+ pdev->driver->ep_start_xfer(hpcd->instance, ep);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_receive_ep0
+ * Receive an amount of data on ep0
+ * pdev: USB handle
+ * buf: pointer to the reception buffer
+ * len: amount of data to be received
+ * return : status
+ */
+enum usb_status usb_core_receive_ep0(struct usb_handle *pdev, uint8_t *buf,
+ uint32_t len)
+{
+ /* Prepare the reception of the buffer over EP0 */
+ if (len != 0U) {
+ pdev->ep0_state = USBD_EP0_DATA_OUT;
+ } else {
+ pdev->ep0_state = USBD_EP0_STATUS_OUT;
+ }
+
+ pdev->ep_out[0].total_length = len;
+ pdev->ep_out[0].rem_length = len;
+
+ /* Start the transfer */
+ return usb_core_receive(pdev, 0U, buf, len);
+}
+
+/*
+ * usb_core_transmit_ep0
+ * Send an amount of data on ep0
+ * pdev: USB handle
+ * buf: pointer to the transmission buffer
+ * len: amount of data to be sent
+ * return : status
+ */
+enum usb_status usb_core_transmit_ep0(struct usb_handle *pdev, uint8_t *buf,
+ uint32_t len)
+{
+ /* Set EP0 State */
+ if (len != 0U) {
+ pdev->ep0_state = USBD_EP0_DATA_IN;
+ } else {
+ pdev->ep0_state = USBD_EP0_STATUS_IN;
+ }
+
+ pdev->ep_in[0].total_length = len;
+ pdev->ep_in[0].rem_length = len;
+
+ /* Start the transfer */
+ return usb_core_transmit(pdev, 0U, buf, len);
+}
+
+/*
+ * usb_core_ctl_error
+ * Handle USB low level error
+ * pdev: device instance
+ * req: usb request
+ * return : None
+ */
+
+void usb_core_ctl_error(struct usb_handle *pdev)
+{
+ ERROR("%s : Send an ERROR\n", __func__);
+ usb_core_set_stall(pdev, EP0_IN);
+ usb_core_set_stall(pdev, EP0_OUT);
+}
+
+/*
+ * usb_core_start
+ * Start the USB device core.
+ * pdev: Device Handle
+ * return : USBD Status
+ */
+enum usb_status usb_core_start(struct usb_handle *pdev)
+{
+ /* Start the low level driver */
+ pdev->driver->start_device(pdev->data->instance);
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_stop
+ * Stop the USB device core.
+ * pdev: Device Handle
+ * return : USBD Status
+ */
+enum usb_status usb_core_stop(struct usb_handle *pdev)
+{
+ /* Free class resources */
+ pdev->class->de_init(pdev, pdev->dev_config);
+
+ /* Stop the low level driver */
+ pdev->driver->stop_device(pdev->data->instance);
+
+ return USBD_OK;
+}
+
+/*
+ * register_usb_driver
+ * Stop the USB device core.
+ * pdev: Device Handle
+ * pcd_handle: PCD handle
+ * driver: USB driver
+ * driver_handle: USB driver handle
+ * return : USBD Status
+ */
+enum usb_status register_usb_driver(struct usb_handle *pdev,
+ struct pcd_handle *pcd_handle,
+ const struct usb_driver *driver,
+ void *driver_handle)
+{
+ uint8_t i;
+
+ assert(pdev != NULL);
+ assert(pcd_handle != NULL);
+ assert(driver != NULL);
+ assert(driver_handle != NULL);
+
+ /* Free class resources */
+ pdev->driver = driver;
+ pdev->data = pcd_handle;
+ pdev->data->instance = driver_handle;
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ pdev->ep0_state = USBD_EP0_IDLE;
+
+ /* Copy endpoint information */
+ for (i = 0U; i < USBD_EP_NB; i++) {
+ pdev->ep_in[i].maxpacket = pdev->data->in_ep[i].maxpacket;
+ pdev->ep_out[i].maxpacket = pdev->data->out_ep[i].maxpacket;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * register_platform
+ * Register the USB device core.
+ * pdev: Device Handle
+ * plat_call_back: callback
+ * return : USBD Status
+ */
+enum usb_status register_platform(struct usb_handle *pdev,
+ const struct usb_desc *plat_call_back)
+{
+ assert(pdev != NULL);
+ assert(plat_call_back != NULL);
+
+ /* Save platform info in class resources */
+ pdev->desc = plat_call_back;
+
+ return USBD_OK;
+}