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453 lines
15 KiB
453 lines
15 KiB
![]()
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/*
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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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// Communications Device Class Code (bFunctionClass, bInterfaceClass)
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#define USB_CLASS_CDC 0x02
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// Data Interface Class Code (bInterfaceClass)
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#define USB_CLASS_DATA 0x0A
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// Class Subclass Code (bFunctionSubClass, bInterfaceSubClass)
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#define USB_CDC_SUBCLASS_ACM 0x02
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// Communications Interface Class Control Protocol Codes (bFunctionProtocol,
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// bInterfaceProtocol)
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#define USB_CDC_PROTOCOL_AT 0x01
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// Descriptor Types (bDescriptorType)
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#define USB_DESC_TYPE_ASSOCIATION 0x0B
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#define USB_DESC_TYPE_CS_INTERACE 0x24
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// Descriptor SubTypes (bDescriptorSubtype)
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#define USB_DESC_TYPE_HEADER 0x00
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#define USB_DESC_TYPE_CM 0x01
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#define USB_DESC_TYPE_ACM 0x02
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#define USB_DESC_TYPE_UNION 0x06
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// Data Phase Transfer Direction (bmRequest)
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#define USB_REQ_DIR_MASK 0x80
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#define USB_REQ_DIR_H2D 0x00
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#define USB_REQ_DIR_D2H 0x80
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// Class-Specific Request Codes for PSTN subclasses
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#define USB_CDC_SET_LINE_CODING 0x20
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#define USB_CDC_GET_LINE_CODING 0x21
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#define USB_CDC_SET_CONTROL_LINE_STATE 0x22
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/* usb_vcp_add adds and configures new USB VCP interface according to
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* configuration options passed in `info`. */
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secbool usb_vcp_add(const usb_vcp_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_vcp_descriptor_block_t *d =
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usb_desc_alloc_iface(sizeof(usb_vcp_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_cmd & USB_EP_DIR_MASK) != USB_EP_DIR_IN) {
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return secfalse; // IN CMD EP is invalid
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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_len == 0) ||
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(info->rx_buffer_len & (info->rx_buffer_len - 1)) != 0) {
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return secfalse; // Capacity needs to be a power of 2
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}
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if ((info->tx_buffer_len == 0) ||
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(info->tx_buffer_len & (info->tx_buffer_len - 1)) != 0) {
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return secfalse; // Capacity needs to be a power of 2
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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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if (info->rx_packet == NULL) {
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return secfalse;
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}
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if (info->tx_buffer == NULL) {
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return secfalse;
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}
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if (info->tx_packet == NULL) {
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return secfalse;
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}
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// Interface association descriptor
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d->assoc.bLength = sizeof(usb_interface_assoc_descriptor_t);
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d->assoc.bDescriptorType = USB_DESC_TYPE_ASSOCIATION;
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d->assoc.bFirstInterface = info->iface_num;
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d->assoc.bInterfaceCount = 2;
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d->assoc.bFunctionClass = USB_CLASS_CDC;
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d->assoc.bFunctionSubClass = USB_CDC_SUBCLASS_ACM;
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d->assoc.bFunctionProtocol = USB_CDC_PROTOCOL_AT;
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d->assoc.iFunction = 0;
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// Interface descriptor
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d->iface_cdc.bLength = sizeof(usb_interface_descriptor_t);
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d->iface_cdc.bDescriptorType = USB_DESC_TYPE_INTERFACE;
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d->iface_cdc.bInterfaceNumber = info->iface_num;
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d->iface_cdc.bAlternateSetting = 0;
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d->iface_cdc.bNumEndpoints = 1;
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d->iface_cdc.bInterfaceClass = USB_CLASS_CDC;
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d->iface_cdc.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM;
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d->iface_cdc.bInterfaceProtocol = USB_CDC_PROTOCOL_AT;
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d->iface_cdc.iInterface = USBD_IDX_INTERFACE_STR;
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// Header Functional Descriptor
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d->fheader.bFunctionLength = sizeof(usb_vcp_header_descriptor_t);
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d->fheader.bDescriptorType = USB_DESC_TYPE_CS_INTERACE;
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d->fheader.bDescriptorSubtype = USB_DESC_TYPE_HEADER;
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d->fheader.bcdCDC = 0x1001; // USB Class Definitions for Communication
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// Devices Specification release number.
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// Call Management Functional Descriptor
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d->fcm.bFunctionLength = sizeof(usb_vcp_cm_descriptor_t);
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d->fcm.bDescriptorType = USB_DESC_TYPE_CS_INTERACE;
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d->fcm.bDescriptorSubtype = USB_DESC_TYPE_CM;
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// Device sends/receives call management information only over the
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// Communication Class interface. Device does not handle call management
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// itself.
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d->fcm.bmCapabilities = 0x00;
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d->fcm.bDataInterface = info->data_iface_num;
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// ACM Functional Descriptor
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d->facm.bFunctionLength = sizeof(usb_vcp_acm_descriptor_t);
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d->facm.bDescriptorType = USB_DESC_TYPE_CS_INTERACE;
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d->facm.bDescriptorSubtype = USB_DESC_TYPE_ACM;
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// Device supports the request combination of Set_Line_Coding,
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// Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State.
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d->facm.bmCapabilities = 0x02;
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// Union Functional Descriptor
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d->funion.bFunctionLength = sizeof(usb_vcp_union_descriptor_t);
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d->funion.bDescriptorType = USB_DESC_TYPE_CS_INTERACE;
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d->funion.bDescriptorSubtype = USB_DESC_TYPE_UNION;
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d->funion.bControlInterface = info->iface_num;
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d->funion.bSubordinateInterface0 = info->data_iface_num;
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// IN CMD endpoint (control)
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d->ep_cmd.bLength = sizeof(usb_endpoint_descriptor_t);
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d->ep_cmd.bDescriptorType = USB_DESC_TYPE_ENDPOINT;
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d->ep_cmd.bEndpointAddress = info->ep_cmd;
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d->ep_cmd.bmAttributes = USBD_EP_TYPE_INTR;
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d->ep_cmd.wMaxPacketSize = USB_CDC_MAX_CMD_PACKET_LEN;
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d->ep_cmd.bInterval = info->polling_interval;
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// Interface descriptor
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d->iface_data.bLength = sizeof(usb_interface_descriptor_t);
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d->iface_data.bDescriptorType = USB_DESC_TYPE_INTERFACE;
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d->iface_data.bInterfaceNumber = info->data_iface_num;
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d->iface_data.bAlternateSetting = 0;
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d->iface_data.bNumEndpoints = 2;
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d->iface_data.bInterfaceClass = USB_CLASS_DATA;
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d->iface_data.bInterfaceSubClass = 0;
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d->iface_data.bInterfaceProtocol = 0;
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d->iface_data.iInterface = USBD_IDX_INTERFACE_STR;
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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_BULK;
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d->ep_out.wMaxPacketSize = info->max_packet_len;
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d->ep_out.bInterval = 0;
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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_BULK;
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d->ep_in.wMaxPacketSize = info->max_packet_len;
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d->ep_in.bInterval = 0;
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// Config descriptor
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usb_desc_add_iface(sizeof(usb_vcp_descriptor_block_t));
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usb_config_desc
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->bNumInterfaces++; // usb_vcp_descriptor_block_t contains 2 interfaces
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// Interface state
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iface->type = USB_IFACE_TYPE_VCP;
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iface->vcp.desc_block = d;
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iface->vcp.rx_ring.buf = info->rx_buffer;
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iface->vcp.rx_ring.cap = info->rx_buffer_len;
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iface->vcp.rx_ring.read = 0;
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iface->vcp.rx_ring.write = 0;
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iface->vcp.tx_ring.buf = info->tx_buffer;
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iface->vcp.tx_ring.cap = info->tx_buffer_len;
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iface->vcp.tx_ring.read = 0;
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iface->vcp.tx_ring.write = 0;
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iface->vcp.rx_packet = info->rx_packet;
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iface->vcp.tx_packet = info->tx_packet;
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iface->vcp.rx_intr_fn = info->rx_intr_fn;
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iface->vcp.rx_intr_byte = info->rx_intr_byte;
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iface->vcp.ep_cmd = info->ep_cmd;
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iface->vcp.ep_in = info->ep_in;
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iface->vcp.ep_out = info->ep_out;
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iface->vcp.max_packet_len = info->max_packet_len;
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iface->vcp.ep_in_is_idle = 1;
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return sectrue;
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8 years ago
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}
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static inline size_t ring_length(usb_rbuf_t *b) { return (b->write - b->read); }
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static inline int ring_empty(usb_rbuf_t *b) { return ring_length(b) == 0; }
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static inline int ring_full(usb_rbuf_t *b) { return ring_length(b) == b->cap; }
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secbool usb_vcp_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_VCP) {
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return secfalse; // Invalid interface type
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}
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if (ring_empty(&iface->vcp.rx_ring)) {
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return secfalse; // Nothing in the rx buffer
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}
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return sectrue;
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![]()
8 years ago
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}
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secbool usb_vcp_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_VCP) {
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return secfalse; // Invalid interface type
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}
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if (ring_full(&iface->vcp.tx_ring)) {
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return secfalse; // Tx ring buffer is full
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}
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return sectrue;
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![]()
8 years ago
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}
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int usb_vcp_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
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6 years ago
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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_VCP) {
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return -2; // Interface interface type
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}
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usb_vcp_state_t *state = &iface->vcp;
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// Read from the rx ring buffer
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usb_rbuf_t *b = &state->rx_ring;
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size_t mask = b->cap - 1;
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size_t i;
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for (i = 0; (i < len) && !ring_empty(b); i++) {
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buf[i] = b->buf[b->read & mask];
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b->read++;
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}
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return i;
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![]()
8 years ago
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}
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int usb_vcp_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
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![]()
6 years ago
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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_VCP) {
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return -2; // Interface interface type
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}
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usb_vcp_state_t *state = &iface->vcp;
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// Write into the tx ring buffer
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usb_rbuf_t *b = &state->tx_ring;
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size_t mask = b->cap - 1;
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size_t i;
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for (i = 0; (i < len) && !ring_full(b); i++) {
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b->buf[b->write & mask] = buf[i];
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b->write++;
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}
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![]()
5 years ago
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return i;
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![]()
8 years ago
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}
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![]()
6 years ago
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int usb_vcp_read_blocking(uint8_t iface_num, uint8_t *buf, uint32_t len,
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int timeout) {
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uint32_t start = HAL_GetTick();
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while (sectrue != usb_vcp_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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![]()
8 years ago
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}
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![]()
6 years ago
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__WFI(); // Enter sleep mode, waiting for interrupt
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}
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return usb_vcp_read(iface_num, buf, len);
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![]()
8 years ago
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}
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6 years ago
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int usb_vcp_write_blocking(uint8_t iface_num, const uint8_t *buf, uint32_t len,
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int timeout) {
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uint32_t start = HAL_GetTick();
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![]()
5 years ago
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uint32_t i = 0;
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while (i < len) {
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while (sectrue != usb_vcp_can_write(iface_num)) {
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if (timeout >= 0 && HAL_GetTick() - start >= timeout) {
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return i; // Timeout
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}
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__WFI(); // Enter sleep mode, waiting for interrupt
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![]()
8 years ago
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}
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![]()
5 years ago
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int ret = usb_vcp_write(iface_num, buf + i, len - i);
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if (ret < 0) return ret;
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i += ret;
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![]()
6 years ago
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}
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![]()
5 years ago
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return i;
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![]()
8 years ago
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}
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6 years ago
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static void usb_vcp_class_init(USBD_HandleTypeDef *dev, usb_vcp_state_t *state,
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uint8_t cfg_idx) {
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// Open endpoints
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USBD_LL_OpenEP(dev, state->ep_in, USBD_EP_TYPE_BULK, state->max_packet_len);
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USBD_LL_OpenEP(dev, state->ep_out, USBD_EP_TYPE_BULK, state->max_packet_len);
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USBD_LL_OpenEP(dev, state->ep_cmd, USBD_EP_TYPE_INTR,
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USB_CDC_MAX_CMD_PACKET_LEN);
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// Reset the state
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state->rx_ring.read = 0;
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state->rx_ring.write = 0;
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state->tx_ring.read = 0;
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state->tx_ring.write = 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_packet,
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state->max_packet_len);
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![]()
8 years ago
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}
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![]()
6 years ago
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static void usb_vcp_class_deinit(USBD_HandleTypeDef *dev,
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usb_vcp_state_t *state, 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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USBD_LL_FlushEP(dev, state->ep_cmd);
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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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USBD_LL_CloseEP(dev, state->ep_cmd);
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8 years ago
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}
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6 years ago
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static int usb_vcp_class_setup(USBD_HandleTypeDef *dev, usb_vcp_state_t *state,
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USBD_SetupReqTypedef *req) {
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static const usb_cdc_line_coding_t line_coding = {
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.dwDTERate = 115200,
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.bCharFormat = USB_CDC_1_STOP_BITS,
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.bParityType = USB_CDC_NO_PARITY,
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.bDataBits = 8,
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};
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![]()
8 years ago
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![]()
6 years ago
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if ((req->bmRequest & USB_REQ_TYPE_MASK) != USB_REQ_TYPE_CLASS) {
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8 years ago
|
return USBD_OK;
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6 years ago
|
}
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||
![]()
8 years ago
|
|
||
![]()
6 years ago
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if ((req->bmRequest & USB_REQ_DIR_MASK) == USB_REQ_DIR_D2H) {
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||
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if (req->bRequest == USB_CDC_GET_LINE_CODING) {
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||
|
USBD_CtlSendData(dev, UNCONST(&line_coding),
|
||
|
MIN_8bits(req->wLength, sizeof(line_coding)));
|
||
|
} else {
|
||
|
USBD_CtlSendData(dev, state->cmd_buffer,
|
||
|
MIN_8bits(req->wLength, USB_CDC_MAX_CMD_PACKET_LEN));
|
||
![]()
8 years ago
|
}
|
||
![]()
6 years ago
|
} else { // USB_REQ_DIR_H2D
|
||
|
if (req->wLength > 0) {
|
||
|
USBD_CtlPrepareRx(dev, state->cmd_buffer,
|
||
|
MIN_8bits(req->wLength, USB_CDC_MAX_CMD_PACKET_LEN));
|
||
|
}
|
||
|
}
|
||
![]()
8 years ago
|
|
||
![]()
6 years ago
|
return USBD_OK;
|
||
|
}
|
||
![]()
8 years ago
|
|
||
![]()
6 years ago
|
static void usb_vcp_class_data_in(USBD_HandleTypeDef *dev,
|
||
|
usb_vcp_state_t *state, uint8_t ep_num) {
|
||
|
if ((ep_num | USB_EP_DIR_IN) == state->ep_in) {
|
||
|
state->ep_in_is_idle = 1;
|
||
|
}
|
||
![]()
8 years ago
|
}
|
||
![]()
8 years ago
|
|
||
![]()
6 years ago
|
static void usb_vcp_class_data_out(USBD_HandleTypeDef *dev,
|
||
|
usb_vcp_state_t *state, uint8_t ep_num) {
|
||
|
if (ep_num == state->ep_out) {
|
||
|
uint32_t len = USBD_LL_GetRxDataSize(dev, ep_num);
|
||
![]()
8 years ago
|
|
||
![]()
6 years ago
|
// Write into the rx ring buffer
|
||
|
usb_rbuf_t *b = &state->rx_ring;
|
||
![]()
7 years ago
|
size_t mask = b->cap - 1;
|
||
![]()
8 years ago
|
size_t i;
|
||
![]()
6 years ago
|
for (i = 0; i < len; i++) {
|
||
|
if (state->rx_intr_fn != NULL) {
|
||
|
if (state->rx_packet[i] == state->rx_intr_byte) {
|
||
|
state->rx_intr_fn();
|
||
|
}
|
||
|
}
|
||
|
if (!ring_full(b)) {
|
||
|
b->buf[b->write & mask] = state->rx_packet[i];
|
||
|
b->write++;
|
||
|
}
|
||
![]()
8 years ago
|
}
|
||
|
|
||
![]()
6 years ago
|
// Prepare the OUT EP to receive next packet
|
||
|
USBD_LL_PrepareReceive(dev, state->ep_out, state->rx_packet,
|
||
|
state->max_packet_len);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void usb_vcp_class_sof(USBD_HandleTypeDef *dev, usb_vcp_state_t *state) {
|
||
|
if (!state->ep_in_is_idle) {
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// Read from the tx ring buffer
|
||
|
usb_rbuf_t *b = &state->tx_ring;
|
||
|
uint8_t *buf = state->tx_packet;
|
||
|
// We avoid sending full packets as they stall the hosts pipeline, see:
|
||
|
// <http://www.cypress.com/?id=4&rID=92719>
|
||
|
size_t len = state->max_packet_len - 1;
|
||
|
size_t mask = b->cap - 1;
|
||
|
size_t i;
|
||
|
for (i = 0; (i < len) && !ring_empty(b); i++) {
|
||
|
buf[i] = b->buf[b->read & mask];
|
||
|
b->read++;
|
||
|
}
|
||
|
|
||
|
if (i > 0) {
|
||
|
state->ep_in_is_idle = 0;
|
||
|
USBD_LL_Transmit(&usb_dev_handle, state->ep_in, buf, (uint16_t)i);
|
||
|
}
|
||
![]()
8 years ago
|
}
|