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usb: Allow registration of a single non-contiguous string descriptor for WinUSB

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Classic WinUSB support is detected by probing for a string descriptor
at index 0xEE with a special string.
usbd_register_extra_string() allows registration of a string at this
index without having to provide 237 other string descriptors

Originally filed as https://github.com/libopencm3/libopencm3/pull/849

WCID reference: https://github.com/pbatard/libwdi/wiki/WCID-Devices
This commit is contained in:
Devan Lai
2020-10-17 17:12:20 +00:00
committed by Karl Palsson
parent ffe8ddfca2
commit c13c2b3b3c
4 changed files with 38 additions and 1 deletions
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16
lib/usb/usb.c
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@@ -54,6 +54,8 @@ usbd_device *usbd_init(const usbd_driver *driver,
usbd_dev->config = conf;
usbd_dev->strings = strings;
usbd_dev->num_strings = num_strings;
usbd_dev->extra_string_idx = 0;
usbd_dev->extra_string = NULL;
usbd_dev->ctrl_buf = control_buffer;
usbd_dev->ctrl_buf_len = control_buffer_size;
@@ -94,6 +96,20 @@ void usbd_register_sof_callback(usbd_device *usbd_dev, void (*callback)(void))
usbd_dev->user_callback_sof = callback;
}
void usbd_register_extra_string(usbd_device *usbd_dev, int index, const char* string)
{
/*
* Note: string index 0 is reserved for LANGID requests and cannot
* be overwritten using this functionality.
*/
if (string != NULL && index > 0) {
usbd_dev->extra_string_idx = index;
usbd_dev->extra_string = string;
} else {
usbd_dev->extra_string_idx = 0;
}
}
void _usbd_reset(usbd_device *usbd_dev)
{
usbd_dev->current_address = 0;