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trezor-firmware/winusb.c

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/*
* Copyright (c) 2016, Devan Lai
*
* Permission to use, copy, modify, and/or distribute this software
* for any purpose with or without fee is hereby granted, provided
* that the above copyright notice and this permission notice
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <libopencm3/usb/usbd.h>
#include "util.h"
#include "winusb.h"
static int usb_descriptor_type(uint16_t wValue) {
return wValue >> 8;
}
static int usb_descriptor_index(uint16_t wValue) {
return wValue & 0xFF;
}
static struct winusb_compatible_id_descriptor winusb_wcid = {
.header = {
.dwLength = sizeof(struct winusb_compatible_id_descriptor_header) +
1 * sizeof(struct winusb_compatible_id_function_section),
.bcdVersion = WINUSB_BCD_VERSION,
.wIndex = WINUSB_REQ_GET_COMPATIBLE_ID_FEATURE_DESCRIPTOR,
.bNumSections = 1,
.reserved = { 0, 0, 0, 0, 0, 0, 0 },
},
.functions = {
{
// note - bInterfaceNumber is rewritten in winusb_setup with the correct interface number
.bInterfaceNumber = 0,
.reserved0 = { 1 },
.compatibleId = "WINUSB",
.subCompatibleId = "",
.reserved1 = { 0, 0, 0, 0, 0, 0}
},
}
};
static const struct usb_string_descriptor winusb_string_descriptor = {
.bLength = 0x12,
.bDescriptorType = USB_DT_STRING,
.wData = WINUSB_EXTRA_STRING
};
static const struct winusb_extended_properties_descriptor guid = {
.header = {
.dwLength = sizeof(struct winusb_extended_properties_descriptor_header)
+ 1 * sizeof (struct winusb_extended_properties_feature_descriptor),
.bcdVersion = WINUSB_BCD_VERSION,
.wIndex = WINUSB_REQ_GET_EXTENDED_PROPERTIES_OS_FEATURE_DESCRIPTOR,
.wNumFeatures = 1,
},
.features = {
{
.dwLength = sizeof(struct winusb_extended_properties_feature_descriptor),
.dwPropertyDataType = WINUSB_EXTENDED_PROPERTIES_MULTISZ_DATA_TYPE,
.wNameLength = WINUSB_EXTENDED_PROPERTIES_GUID_NAME_SIZE_C,
.name = WINUSB_EXTENDED_PROPERTIES_GUID_NAME,
.dwPropertyDataLength = WINUSB_EXTENDED_PROPERTIES_GUID_DATA_SIZE_C,
.propertyData = WINUSB_EXTENDED_PROPERTIES_GUID_DATA,
},
}
};
static int winusb_descriptor_request(usbd_device *usbd_dev,
struct usb_setup_data *req,
uint8_t **buf, uint16_t *len,
usbd_control_complete_callback* complete) {
(void)complete;
(void)usbd_dev;
if ((req->bmRequestType & USB_REQ_TYPE_TYPE) != USB_REQ_TYPE_STANDARD) {
return USBD_REQ_NEXT_CALLBACK;
}
if (req->bRequest == USB_REQ_GET_DESCRIPTOR && usb_descriptor_type(req->wValue) == USB_DT_STRING) {
if (usb_descriptor_index(req->wValue) == WINUSB_EXTRA_STRING_INDEX) {
*buf = (uint8_t*)(&winusb_string_descriptor);
*len = MIN(*len, winusb_string_descriptor.bLength);
return USBD_REQ_HANDLED;
}
}
return USBD_REQ_NEXT_CALLBACK;
}
static int winusb_control_vendor_request(usbd_device *usbd_dev,
struct usb_setup_data *req,
uint8_t **buf, uint16_t *len,
usbd_control_complete_callback* complete) {
(void)complete;
(void)usbd_dev;
if (req->bRequest != WINUSB_MS_VENDOR_CODE) {
return USBD_REQ_NEXT_CALLBACK;
}
int status = USBD_REQ_NOTSUPP;
if (((req->bmRequestType & USB_REQ_TYPE_RECIPIENT) == USB_REQ_TYPE_DEVICE) &&
(req->wIndex == WINUSB_REQ_GET_COMPATIBLE_ID_FEATURE_DESCRIPTOR)) {
*buf = (uint8_t*)(&winusb_wcid);
*len = MIN(*len, winusb_wcid.header.dwLength);
status = USBD_REQ_HANDLED;
} else if (((req->bmRequestType & USB_REQ_TYPE_RECIPIENT) == USB_REQ_TYPE_INTERFACE) &&
(req->wIndex == WINUSB_REQ_GET_EXTENDED_PROPERTIES_OS_FEATURE_DESCRIPTOR) &&
(usb_descriptor_index(req->wValue) == winusb_wcid.functions[0].bInterfaceNumber)) {
*buf = (uint8_t*)(&guid);
*len = MIN(*len, guid.header.dwLength);
status = USBD_REQ_HANDLED;
} else {
status = USBD_REQ_NOTSUPP;
}
return status;
}
static void winusb_set_config(usbd_device* usbd_dev, uint16_t wValue) {
(void)wValue;
usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_VENDOR,
USB_REQ_TYPE_TYPE,
winusb_control_vendor_request);
}
void winusb_setup(usbd_device* usbd_dev, uint8_t interface) {
winusb_wcid.functions[0].bInterfaceNumber = interface;
usbd_register_set_config_callback(usbd_dev, winusb_set_config);
/* Windows probes the compatible ID before setting the configuration,
so also register the callback now */
usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_VENDOR,
USB_REQ_TYPE_TYPE,
winusb_control_vendor_request);
usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_DEVICE,
USB_REQ_TYPE_RECIPIENT,
winusb_descriptor_request);
}