Initial USB device stack for STM32.
Patch provided by Gareth McMullin <gareth@blacksphere.co.nz>, thanks a lot!
This commit is contained in:
Uwe Hermann
268
lib/usb/usb_standard.c
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268
lib/usb/usb_standard.c
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
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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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#include <string.h>
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#include <usbd.h>
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#include "usb_private.h"
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void usbd_register_set_config_callback(void (*callback)(uint16_t wValue))
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{
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_usbd_device.user_callback_set_config = callback;
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}
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static uint16_t
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build_config_descriptor(uint8_t index, uint8_t *buf, uint16_t len)
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{
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uint8_t *tmpbuf = buf;
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const struct usb_config_descriptor *cfg = &_usbd_device.config[index];
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uint16_t count, total = 0, totallen = 0;
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uint16_t i, j, k;
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memcpy(buf, cfg, count = MIN(len, cfg->bLength));
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buf += count; len -= count; total += count; totallen += cfg->bLength;
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/* For each interface... */
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for(i = 0; i < cfg->bNumInterfaces; i++) {
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/* For each alternate setting... */
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for(j = 0; j < cfg->interface[i].num_altsetting; j++) {
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const struct usb_interface_descriptor *iface =
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&cfg->interface[i].altsetting[j];
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/* Copy interface descriptor */
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memcpy(buf, iface, count = MIN(len, iface->bLength));
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buf += count; len -= count;
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total += count; totallen += iface->bLength;
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/* Copy extra bytes (function descriptors) */
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memcpy(buf, iface->extra,
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count = MIN(len, iface->extralen));
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buf += count; len -= count;
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total += count; totallen += iface->extralen;
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/* For each endpoint... */
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for(k = 0; k < iface->bNumEndpoints; k++) {
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const struct usb_endpoint_descriptor *ep =
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&iface->endpoint[k];
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memcpy(buf, ep, count = MIN(len, ep->bLength));
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buf += count; len -= count;
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total += count; totallen += ep->bLength;
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}
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}
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}
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/* Fill in wTotalLength */
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*(uint16_t*)(tmpbuf+2) = totallen;
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return total;
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}
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static int usb_standard_get_descriptor(struct usb_setup_data *req,
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uint8_t **buf, uint16_t *len)
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{
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int i;
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switch(req->wValue >> 8) {
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case USB_DT_DEVICE:
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*buf = (uint8_t *)_usbd_device.desc;
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*len = MIN(*len, _usbd_device.desc->bLength);
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return 1;
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case USB_DT_CONFIGURATION: {
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*buf = _usbd_device.ctrl_buf;
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*len = build_config_descriptor(req->wValue & 0xff, *buf, *len);
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return 1;
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}
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case USB_DT_STRING: {
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struct usb_string_descriptor *sd =
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(struct usb_string_descriptor *)_usbd_device.ctrl_buf;
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if(!_usbd_device.strings)
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return 0; /* Device doesn't support strings */
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sd->bLength = strlen(_usbd_device.strings[req->wValue & 0xff])
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* 2 + 2;
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sd->bDescriptorType = USB_DT_STRING;
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*buf = (uint8_t *)sd;
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*len = MIN(*len, sd->bLength);
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for(i = 0; i < (*len / 2) - 1; i++)
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sd->wData[i] =
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_usbd_device.strings[req->wValue & 0xff][i];
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/* Send sane Language ID descriptor... */
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if((req->wValue & 0xff) == 0)
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sd->wData[0] = 0x409;
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return 1;
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}
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}
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return 0;
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}
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static int usb_standard_set_address(struct usb_setup_data *req)
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{
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/* The actual address is only latched at the STATUS IN stage */
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if((req->bmRequestType != 0) || (req->wValue >= 128)) return 0;
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_usbd_device.current_address = req->wValue;
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return 1;
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}
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static int usb_standard_set_configuration(struct usb_setup_data *req)
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{
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/* Is this correct, or should we reset alternate settings */
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if(req->wValue == _usbd_device.current_config) return 1;
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_usbd_device.current_config = req->wValue;
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/* Reset all endpoints */
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_usbd_hw_endpoints_reset();
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if(_usbd_device.user_callback_set_config)
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_usbd_device.user_callback_set_config(req->wValue);
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return 1;
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}
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static int usb_standard_get_configuration(struct usb_setup_data *req,
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uint8_t **buf, uint16_t *len)
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{
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(void)req;
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if(*len > 1) *len = 1;
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(*buf)[0] = _usbd_device.current_config;
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return 1;
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}
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static int usb_standard_set_interface(struct usb_setup_data *req)
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{
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(void)req;
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/* FIXME: Do something meaningful here: call app */
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return 1;
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}
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static int usb_standard_get_status(struct usb_setup_data *req, uint8_t **buf,
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uint16_t *len)
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{
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(void)req;
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/* FIXME: Return some meaningful status */
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if(*len > 2) *len = 2;
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(*buf)[0] = 0;
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(*buf)[1] = 0;
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return 1;
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}
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int _usbd_standard_request_command(struct usb_setup_data *req)
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{
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int (*command)(struct usb_setup_data *req) = NULL;
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if((req->bmRequestType & 0x60) != USB_REQ_TYPE_STANDARD)
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return 0;
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switch(req->bRequest) {
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case USB_REQ_CLEAR_FEATURE:
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/* FIXME: Implement CLEAR_FEATURE */
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/* TODO: Check what standard features are.
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* Maybe this is the application's responsibility. */
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break;
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case USB_REQ_SET_ADDRESS:
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/* SET ADDRESS is an exception.
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* It is only processed at STATUS stage */
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command = usb_standard_set_address;
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break;
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case USB_REQ_SET_CONFIGURATION:
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command = usb_standard_set_configuration;
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break;
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case USB_REQ_SET_FEATURE:
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/* FIXME: Implement SET_FEATURE */
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/* TODO: Check what standard features are.
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* Maybe this is the application's responsibility. */
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break;
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case USB_REQ_SET_INTERFACE:
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command = usb_standard_set_interface;
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break;
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}
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if(!command) return 0;
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return command(req);
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}
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int _usbd_standard_request_read(struct usb_setup_data *req, uint8_t **buf,
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uint16_t *len)
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{
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int (*command)(struct usb_setup_data *req, uint8_t **buf,
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uint16_t *len) = NULL;
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/* Handle standard requests */
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if((req->bmRequestType & 0x60) != USB_REQ_TYPE_STANDARD)
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return 0;
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switch(req->bRequest) {
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case USB_REQ_GET_CONFIGURATION:
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command = usb_standard_get_configuration;
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break;
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case USB_REQ_GET_DESCRIPTOR:
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command = usb_standard_get_descriptor;
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break;
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case USB_REQ_GET_INTERFACE:
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/* FIXME: Implement GET_INTERFACE */
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break;
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case USB_REQ_GET_STATUS:
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/* GET_STATUS always responds with zero reply.
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* The application may override this behaviour. */
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command = usb_standard_get_status;
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break;
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}
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if(!command) return 0;
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return command(req, buf, len);
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}
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int _usbd_standard_request_write(struct usb_setup_data *req, uint8_t *buf,
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uint16_t len)
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{
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int (*command)(struct usb_setup_data *req, uint8_t *buf, uint16_t len)
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= NULL;
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/* Handle standard requests */
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if((req->bmRequestType & 0x60) != USB_REQ_TYPE_STANDARD)
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return 0;
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switch(req->bRequest) {
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case USB_REQ_SET_DESCRIPTOR:
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/* SET_DESCRIPTOR is optional and not implemented. */
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break;
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case USB_REQ_SET_SYNCH_FRAME:
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/* FIXME: SYNCH_FRAME is not implemented. */
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/* SYNCH_FRAME is used for synchronization of isochronous
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* endpoints which are not yet implemented. */
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break;
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}
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if(!command) return 0;
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return command(req, buf, len);
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}
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