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279 lines
8.9 KiB
279 lines
8.9 KiB
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define USB_CLASS_WEBUSB 0xFF
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/* usb_webusb_add adds and configures new USB WebUSB interface according to
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* configuration options passed in `info`. */
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secbool usb_webusb_add(const usb_webusb_info_t *info) {
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usb_iface_t *iface = usb_get_iface(info->iface_num);
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if (iface == NULL) {
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return secfalse; // Invalid interface number
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}
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if (iface->type != USB_IFACE_TYPE_DISABLED) {
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return secfalse; // Interface is already enabled
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}
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usb_webusb_descriptor_block_t *d =
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usb_desc_alloc_iface(sizeof(usb_webusb_descriptor_block_t));
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if (d == NULL) {
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return secfalse; // Not enough space in the configuration descriptor
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}
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if ((info->ep_in & USB_EP_DIR_MASK) != USB_EP_DIR_IN) {
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return secfalse; // IN EP is invalid
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}
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if ((info->ep_out & USB_EP_DIR_MASK) != USB_EP_DIR_OUT) {
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return secfalse; // OUT EP is invalid
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}
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if (info->rx_buffer == NULL) {
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return secfalse;
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}
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// Interface descriptor
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d->iface.bLength = sizeof(usb_interface_descriptor_t);
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d->iface.bDescriptorType = USB_DESC_TYPE_INTERFACE;
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d->iface.bInterfaceNumber = info->iface_num;
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d->iface.bAlternateSetting = 0;
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d->iface.bNumEndpoints = 2;
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d->iface.bInterfaceClass = USB_CLASS_WEBUSB;
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d->iface.bInterfaceSubClass = info->subclass;
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d->iface.bInterfaceProtocol = info->protocol;
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d->iface.iInterface = USBD_IDX_INTERFACE_STR;
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// IN endpoint (sending)
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d->ep_in.bLength = sizeof(usb_endpoint_descriptor_t);
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d->ep_in.bDescriptorType = USB_DESC_TYPE_ENDPOINT;
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d->ep_in.bEndpointAddress = info->ep_in;
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d->ep_in.bmAttributes = USBD_EP_TYPE_INTR;
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d->ep_in.wMaxPacketSize = info->max_packet_len;
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d->ep_in.bInterval = info->polling_interval;
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// OUT endpoint (receiving)
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d->ep_out.bLength = sizeof(usb_endpoint_descriptor_t);
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d->ep_out.bDescriptorType = USB_DESC_TYPE_ENDPOINT;
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d->ep_out.bEndpointAddress = info->ep_out;
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d->ep_out.bmAttributes = USBD_EP_TYPE_INTR;
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d->ep_out.wMaxPacketSize = info->max_packet_len;
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d->ep_out.bInterval = info->polling_interval;
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// Config descriptor
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usb_desc_add_iface(sizeof(usb_webusb_descriptor_block_t));
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// Interface state
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iface->type = USB_IFACE_TYPE_WEBUSB;
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iface->webusb.desc_block = d;
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iface->webusb.rx_buffer = info->rx_buffer;
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iface->webusb.ep_in = info->ep_in;
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iface->webusb.ep_out = info->ep_out;
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iface->webusb.max_packet_len = info->max_packet_len;
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iface->webusb.alt_setting = 0;
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iface->webusb.last_read_len = 0;
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iface->webusb.ep_in_is_idle = 1;
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return sectrue;
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}
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secbool usb_webusb_can_read(uint8_t iface_num) {
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usb_iface_t *iface = usb_get_iface(iface_num);
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if (iface == NULL) {
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return secfalse; // Invalid interface number
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}
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if (iface->type != USB_IFACE_TYPE_WEBUSB) {
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return secfalse; // Invalid interface type
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}
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if (iface->webusb.last_read_len == 0) {
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return secfalse; // Nothing in the receiving buffer
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}
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if (usb_dev_handle.dev_state != USBD_STATE_CONFIGURED) {
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return secfalse; // Device is not configured
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}
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return sectrue;
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}
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secbool usb_webusb_can_write(uint8_t iface_num) {
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usb_iface_t *iface = usb_get_iface(iface_num);
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if (iface == NULL) {
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return secfalse; // Invalid interface number
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}
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if (iface->type != USB_IFACE_TYPE_WEBUSB) {
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return secfalse; // Invalid interface type
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}
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if (iface->webusb.ep_in_is_idle == 0) {
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return secfalse; // Last transmission is not over yet
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}
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if (usb_dev_handle.dev_state != USBD_STATE_CONFIGURED) {
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return secfalse; // Device is not configured
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}
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return sectrue;
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}
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int usb_webusb_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
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usb_iface_t *iface = usb_get_iface(iface_num);
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if (iface == NULL) {
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return -1; // Invalid interface number
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}
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if (iface->type != USB_IFACE_TYPE_WEBUSB) {
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return -2; // Invalid interface type
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}
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volatile usb_webusb_state_t *state = &iface->webusb;
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// Copy maximum possible amount of data
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uint32_t last_read_len = state->last_read_len;
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if (len < last_read_len) {
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return 0; // Not enough data in the read buffer
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}
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memcpy(buf, state->rx_buffer, last_read_len);
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// Reset the length to indicate we are ready to read next packet
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state->last_read_len = 0;
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// Prepare the OUT EP to receive next packet
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USBD_LL_PrepareReceive(&usb_dev_handle, state->ep_out, state->rx_buffer,
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state->max_packet_len);
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return last_read_len;
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}
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int usb_webusb_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
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usb_iface_t *iface = usb_get_iface(iface_num);
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if (iface == NULL) {
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return -1; // Invalid interface number
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}
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if (iface->type != USB_IFACE_TYPE_WEBUSB) {
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return -2; // Invalid interface type
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}
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volatile usb_webusb_state_t *state = &iface->webusb;
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state->ep_in_is_idle = 0;
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USBD_LL_Transmit(&usb_dev_handle, state->ep_in, UNCONST(buf), (uint16_t)len);
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return len;
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}
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int usb_webusb_read_select(uint32_t timeout) {
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const uint32_t start = HAL_GetTick();
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for (;;) {
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for (int i = 0; i < USBD_MAX_NUM_INTERFACES; i++) {
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if (sectrue == usb_webusb_can_read(i)) {
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return i;
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}
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}
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if (HAL_GetTick() - start >= timeout) {
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break;
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}
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__WFI(); // Enter sleep mode, waiting for interrupt
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}
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return -1; // Timeout
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}
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int usb_webusb_read_blocking(uint8_t iface_num, uint8_t *buf, uint32_t len,
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int timeout) {
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const uint32_t start = HAL_GetTick();
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while (sectrue != usb_webusb_can_read(iface_num)) {
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if (timeout >= 0 && HAL_GetTick() - start >= timeout) {
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return 0; // Timeout
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}
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__WFI(); // Enter sleep mode, waiting for interrupt
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}
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return usb_webusb_read(iface_num, buf, len);
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}
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int usb_webusb_write_blocking(uint8_t iface_num, const uint8_t *buf,
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uint32_t len, int timeout) {
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const uint32_t start = HAL_GetTick();
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while (sectrue != usb_webusb_can_write(iface_num)) {
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if (timeout >= 0 && HAL_GetTick() - start >= timeout) {
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return 0; // Timeout
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}
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__WFI(); // Enter sleep mode, waiting for interrupt
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}
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return usb_webusb_write(iface_num, buf, len);
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}
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static void usb_webusb_class_init(USBD_HandleTypeDef *dev,
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usb_webusb_state_t *state, uint8_t cfg_idx) {
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// Open endpoints
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USBD_LL_OpenEP(dev, state->ep_in, USBD_EP_TYPE_INTR, state->max_packet_len);
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USBD_LL_OpenEP(dev, state->ep_out, USBD_EP_TYPE_INTR, state->max_packet_len);
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// Reset the state
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state->alt_setting = 0;
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state->last_read_len = 0;
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state->ep_in_is_idle = 1;
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// Prepare the OUT EP to receive next packet
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USBD_LL_PrepareReceive(dev, state->ep_out, state->rx_buffer,
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state->max_packet_len);
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}
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static void usb_webusb_class_deinit(USBD_HandleTypeDef *dev,
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usb_webusb_state_t *state,
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uint8_t cfg_idx) {
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// Flush endpoints
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USBD_LL_FlushEP(dev, state->ep_in);
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USBD_LL_FlushEP(dev, state->ep_out);
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// Close endpoints
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USBD_LL_CloseEP(dev, state->ep_in);
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USBD_LL_CloseEP(dev, state->ep_out);
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}
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static int usb_webusb_class_setup(USBD_HandleTypeDef *dev,
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usb_webusb_state_t *state,
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USBD_SetupReqTypedef *req) {
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if ((req->bmRequest & USB_REQ_TYPE_MASK) != USB_REQ_TYPE_STANDARD) {
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return USBD_OK;
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}
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switch (req->bRequest) {
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case USB_REQ_SET_INTERFACE:
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state->alt_setting = req->wValue;
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USBD_CtlSendStatus(dev);
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return USBD_OK;
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case USB_REQ_GET_INTERFACE:
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USBD_CtlSendData(dev, &state->alt_setting, sizeof(state->alt_setting));
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return USBD_OK;
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default:
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USBD_CtlError(dev, req);
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return USBD_FAIL;
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}
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}
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static void usb_webusb_class_data_in(USBD_HandleTypeDef *dev,
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usb_webusb_state_t *state,
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uint8_t ep_num) {
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if ((ep_num | USB_EP_DIR_IN) == state->ep_in) {
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state->ep_in_is_idle = 1;
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}
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}
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static void usb_webusb_class_data_out(USBD_HandleTypeDef *dev,
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usb_webusb_state_t *state,
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uint8_t ep_num) {
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if (ep_num == state->ep_out) {
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// Save the report length to indicate we have read something, but don't
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// schedule next reading until user reads this one
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state->last_read_len = USBD_LL_GetRxDataSize(dev, ep_num);
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}
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}
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