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loopback.c
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loopback.c
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/*
* USB loopback function
*
* Copyright (c) 2018 Phytec Messtechnik GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/init.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/usb/usb_device.h>
#include <usb_descriptor.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(usb_loopback, CONFIG_USB_DEVICE_LOG_LEVEL);
#define LOOPBACK_OUT_EP_ADDR 0x01
#define LOOPBACK_IN_EP_ADDR 0x81
#define LOOPBACK_OUT_EP_IDX 0
#define LOOPBACK_IN_EP_IDX 1
static uint8_t loopback_buf[1024];
BUILD_ASSERT(sizeof(loopback_buf) == CONFIG_USB_REQUEST_BUFFER_SIZE);
/* usb.rst config structure start */
struct usb_loopback_config {
struct usb_if_descriptor if0;
struct usb_ep_descriptor if0_out_ep;
struct usb_ep_descriptor if0_in_ep;
} __packed;
USBD_CLASS_DESCR_DEFINE(primary, 0) struct usb_loopback_config loopback_cfg = {
/* Interface descriptor 0 */
.if0 = {
.bLength = sizeof(struct usb_if_descriptor),
.bDescriptorType = USB_DESC_INTERFACE,
.bInterfaceNumber = 0,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_BCC_VENDOR,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = 0,
},
/* Data Endpoint OUT */
.if0_out_ep = {
.bLength = sizeof(struct usb_ep_descriptor),
.bDescriptorType = USB_DESC_ENDPOINT,
.bEndpointAddress = LOOPBACK_OUT_EP_ADDR,
.bmAttributes = USB_DC_EP_BULK,
.wMaxPacketSize = sys_cpu_to_le16(CONFIG_LOOPBACK_BULK_EP_MPS),
.bInterval = 0x00,
},
/* Data Endpoint IN */
.if0_in_ep = {
.bLength = sizeof(struct usb_ep_descriptor),
.bDescriptorType = USB_DESC_ENDPOINT,
.bEndpointAddress = LOOPBACK_IN_EP_ADDR,
.bmAttributes = USB_DC_EP_BULK,
.wMaxPacketSize = sys_cpu_to_le16(CONFIG_LOOPBACK_BULK_EP_MPS),
.bInterval = 0x00,
},
};
/* usb.rst config structure end */
static void loopback_out_cb(uint8_t ep, enum usb_dc_ep_cb_status_code ep_status)
{
uint32_t bytes_to_read;
usb_read(ep, NULL, 0, &bytes_to_read);
LOG_DBG("ep 0x%x, bytes to read %d ", ep, bytes_to_read);
usb_read(ep, loopback_buf, bytes_to_read, NULL);
}
static void loopback_in_cb(uint8_t ep, enum usb_dc_ep_cb_status_code ep_status)
{
if (usb_write(ep, loopback_buf, CONFIG_LOOPBACK_BULK_EP_MPS, NULL)) {
LOG_DBG("ep 0x%x", ep);
}
}
/* usb.rst endpoint configuration start */
static struct usb_ep_cfg_data ep_cfg[] = {
{
.ep_cb = loopback_out_cb,
.ep_addr = LOOPBACK_OUT_EP_ADDR,
},
{
.ep_cb = loopback_in_cb,
.ep_addr = LOOPBACK_IN_EP_ADDR,
},
};
/* usb.rst endpoint configuration end */
static void loopback_status_cb(struct usb_cfg_data *cfg,
enum usb_dc_status_code status,
const uint8_t *param)
{
ARG_UNUSED(cfg);
switch (status) {
case USB_DC_INTERFACE:
loopback_in_cb(ep_cfg[LOOPBACK_IN_EP_IDX].ep_addr, 0);
LOG_DBG("USB interface configured");
break;
case USB_DC_SET_HALT:
LOG_DBG("Set Feature ENDPOINT_HALT");
break;
case USB_DC_CLEAR_HALT:
LOG_DBG("Clear Feature ENDPOINT_HALT");
if (*param == ep_cfg[LOOPBACK_IN_EP_IDX].ep_addr) {
loopback_in_cb(ep_cfg[LOOPBACK_IN_EP_IDX].ep_addr, 0);
}
break;
default:
break;
}
}
/* usb.rst vendor handler start */
static int loopback_vendor_handler(struct usb_setup_packet *setup,
int32_t *len, uint8_t **data)
{
LOG_DBG("Class request: bRequest 0x%x bmRequestType 0x%x len %d",
setup->bRequest, setup->bmRequestType, *len);
if (setup->RequestType.recipient != USB_REQTYPE_RECIPIENT_DEVICE) {
return -ENOTSUP;
}
if (usb_reqtype_is_to_device(setup) &&
setup->bRequest == 0x5b) {
LOG_DBG("Host-to-Device, data %p", *data);
/*
* Copy request data in loopback_buf buffer and reuse
* it later in control device-to-host transfer.
*/
memcpy(loopback_buf, *data,
MIN(sizeof(loopback_buf), setup->wLength));
return 0;
}
if ((usb_reqtype_is_to_host(setup)) &&
(setup->bRequest == 0x5c)) {
LOG_DBG("Device-to-Host, wLength %d, data %p",
setup->wLength, *data);
*data = loopback_buf;
*len = MIN(sizeof(loopback_buf), setup->wLength);
return 0;
}
return -ENOTSUP;
}
/* usb.rst vendor handler end */
static void loopback_interface_config(struct usb_desc_header *head,
uint8_t bInterfaceNumber)
{
ARG_UNUSED(head);
loopback_cfg.if0.bInterfaceNumber = bInterfaceNumber;
}
/* usb.rst device config data start */
USBD_DEFINE_CFG_DATA(loopback_config) = {
.usb_device_description = NULL,
.interface_config = loopback_interface_config,
.interface_descriptor = &loopback_cfg.if0,
.cb_usb_status = loopback_status_cb,
.interface = {
.class_handler = NULL,
.custom_handler = NULL,
.vendor_handler = loopback_vendor_handler,
},
.num_endpoints = ARRAY_SIZE(ep_cfg),
.endpoint = ep_cfg,
};
/* usb.rst device config data end */