Arti Zirk
244fdbc35c
subrepo: subdir: "libopencm3" merged: "f5813a54" upstream: origin: "https://github.com/libopencm3/libopencm3" branch: "master" commit: "f5813a54" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/** @defgroup usb_control_file Generic USB Control Requests
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@ingroup USB
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@brief <b>Generic USB Control Requests</b>
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@version 1.0.0
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@author @htmlonly © @endhtmlonly 2010
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Gareth McMullin <gareth@blacksphere.co.nz>
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@date 10 March 2013
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LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 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 library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <stdlib.h>
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#include <libopencm3/usb/usbd.h>
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#include "usb_private.h"
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/*
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* According to the USB 2.0 specification, section 8.5.3, when a control
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* transfer is stalled, the pipe becomes idle. We provide one utility to stall
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* a transaction to reduce boilerplate code.
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*/
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static void stall_transaction(usbd_device *usbd_dev)
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{
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usbd_ep_stall_set(usbd_dev, 0, 1);
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usbd_dev->control_state.state = IDLE;
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}
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/**
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* If we're replying with _some_ data, but less than the host is expecting,
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* then we normally just do a short transfer. But if it's short, but a
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* multiple of the endpoint max packet size, we need an explicit ZLP.
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* @param len how much data we want to transfer
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* @param wLength how much the host asked for
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* @param ep_size
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* @return
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*/
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static bool needs_zlp(uint16_t len, uint16_t wLength, uint8_t ep_size)
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{
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if (len < wLength) {
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if (len && (len % ep_size == 0)) {
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return true;
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}
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}
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return false;
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}
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/* Register application callback function for handling USB control requests. */
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int usbd_register_control_callback(usbd_device *usbd_dev, uint8_t type,
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uint8_t type_mask,
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usbd_control_callback callback)
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{
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int i;
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for (i = 0; i < MAX_USER_CONTROL_CALLBACK; i++) {
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if (usbd_dev->user_control_callback[i].cb) {
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continue;
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}
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usbd_dev->user_control_callback[i].type = type;
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usbd_dev->user_control_callback[i].type_mask = type_mask;
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usbd_dev->user_control_callback[i].cb = callback;
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return 0;
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}
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return -1;
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}
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static void usb_control_send_chunk(usbd_device *usbd_dev)
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{
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if (usbd_dev->desc->bMaxPacketSize0 <
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usbd_dev->control_state.ctrl_len) {
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/* Data stage, normal transmission */
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usbd_ep_write_packet(usbd_dev, 0,
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usbd_dev->control_state.ctrl_buf,
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usbd_dev->desc->bMaxPacketSize0);
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usbd_dev->control_state.state = DATA_IN;
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usbd_dev->control_state.ctrl_buf +=
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usbd_dev->desc->bMaxPacketSize0;
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usbd_dev->control_state.ctrl_len -=
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usbd_dev->desc->bMaxPacketSize0;
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} else {
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/* Data stage, end of transmission */
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usbd_ep_write_packet(usbd_dev, 0,
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usbd_dev->control_state.ctrl_buf,
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usbd_dev->control_state.ctrl_len);
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usbd_dev->control_state.state =
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usbd_dev->control_state.needs_zlp ?
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DATA_IN : LAST_DATA_IN;
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usbd_dev->control_state.needs_zlp = false;
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usbd_dev->control_state.ctrl_len = 0;
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usbd_dev->control_state.ctrl_buf = NULL;
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}
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}
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static int usb_control_recv_chunk(usbd_device *usbd_dev)
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{
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uint16_t packetsize = MIN(usbd_dev->desc->bMaxPacketSize0,
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usbd_dev->control_state.req.wLength -
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usbd_dev->control_state.ctrl_len);
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uint16_t size = usbd_ep_read_packet(usbd_dev, 0,
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usbd_dev->control_state.ctrl_buf +
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usbd_dev->control_state.ctrl_len,
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packetsize);
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if (size != packetsize) {
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stall_transaction(usbd_dev);
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return -1;
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}
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usbd_dev->control_state.ctrl_len += size;
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return packetsize;
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}
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static enum usbd_request_return_codes
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usb_control_request_dispatch(usbd_device *usbd_dev,
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struct usb_setup_data *req)
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{
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int i, result = 0;
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struct user_control_callback *cb = usbd_dev->user_control_callback;
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/* Call user command hook function. */
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for (i = 0; i < MAX_USER_CONTROL_CALLBACK; i++) {
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if (cb[i].cb == NULL) {
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break;
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}
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if ((req->bmRequestType & cb[i].type_mask) == cb[i].type) {
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result = cb[i].cb(usbd_dev, req,
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&(usbd_dev->control_state.ctrl_buf),
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&(usbd_dev->control_state.ctrl_len),
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&(usbd_dev->control_state.complete));
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if (result == USBD_REQ_HANDLED ||
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result == USBD_REQ_NOTSUPP) {
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return result;
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}
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}
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}
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/* Try standard request if not already handled. */
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return _usbd_standard_request(usbd_dev, req,
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&(usbd_dev->control_state.ctrl_buf),
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&(usbd_dev->control_state.ctrl_len));
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}
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/* Handle commands and read requests. */
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static void usb_control_setup_read(usbd_device *usbd_dev,
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struct usb_setup_data *req)
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{
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usbd_dev->control_state.ctrl_buf = usbd_dev->ctrl_buf;
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usbd_dev->control_state.ctrl_len = req->wLength;
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if (usb_control_request_dispatch(usbd_dev, req)) {
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if (req->wLength) {
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usbd_dev->control_state.needs_zlp =
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needs_zlp(usbd_dev->control_state.ctrl_len,
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req->wLength,
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usbd_dev->desc->bMaxPacketSize0);
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/* Go to data out stage if handled. */
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usb_control_send_chunk(usbd_dev);
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} else {
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/* Go to status stage if handled. */
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usbd_ep_write_packet(usbd_dev, 0, NULL, 0);
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usbd_dev->control_state.state = STATUS_IN;
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}
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} else {
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/* Stall endpoint on failure. */
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stall_transaction(usbd_dev);
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}
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}
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static void usb_control_setup_write(usbd_device *usbd_dev,
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struct usb_setup_data *req)
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{
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if (req->wLength > usbd_dev->ctrl_buf_len) {
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stall_transaction(usbd_dev);
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return;
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}
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/* Buffer into which to write received data. */
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usbd_dev->control_state.ctrl_buf = usbd_dev->ctrl_buf;
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usbd_dev->control_state.ctrl_len = 0;
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/* Wait for DATA OUT stage. */
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if (req->wLength > usbd_dev->desc->bMaxPacketSize0) {
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usbd_dev->control_state.state = DATA_OUT;
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} else {
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usbd_dev->control_state.state = LAST_DATA_OUT;
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}
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usbd_ep_nak_set(usbd_dev, 0, 0);
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}
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/* Do not appear to belong to the API, so are omitted from docs */
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/**@}*/
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void _usbd_control_setup(usbd_device *usbd_dev, uint8_t ea)
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{
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struct usb_setup_data *req = &usbd_dev->control_state.req;
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(void)ea;
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usbd_dev->control_state.complete = NULL;
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usbd_ep_nak_set(usbd_dev, 0, 1);
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if (req->wLength == 0) {
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usb_control_setup_read(usbd_dev, req);
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} else if (req->bmRequestType & 0x80) {
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usb_control_setup_read(usbd_dev, req);
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} else {
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usb_control_setup_write(usbd_dev, req);
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}
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}
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void _usbd_control_out(usbd_device *usbd_dev, uint8_t ea)
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{
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(void)ea;
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switch (usbd_dev->control_state.state) {
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case DATA_OUT:
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if (usb_control_recv_chunk(usbd_dev) < 0) {
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break;
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}
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if ((usbd_dev->control_state.req.wLength -
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usbd_dev->control_state.ctrl_len) <=
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usbd_dev->desc->bMaxPacketSize0) {
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usbd_dev->control_state.state = LAST_DATA_OUT;
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}
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break;
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case LAST_DATA_OUT:
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if (usb_control_recv_chunk(usbd_dev) < 0) {
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break;
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}
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/*
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* We have now received the full data payload.
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* Invoke callback to process.
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*/
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if (usb_control_request_dispatch(usbd_dev,
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&(usbd_dev->control_state.req))) {
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/* Go to status stage on success. */
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usbd_ep_write_packet(usbd_dev, 0, NULL, 0);
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usbd_dev->control_state.state = STATUS_IN;
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} else {
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stall_transaction(usbd_dev);
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}
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break;
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case STATUS_OUT:
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usbd_ep_read_packet(usbd_dev, 0, NULL, 0);
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usbd_dev->control_state.state = IDLE;
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if (usbd_dev->control_state.complete) {
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usbd_dev->control_state.complete(usbd_dev,
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&(usbd_dev->control_state.req));
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}
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usbd_dev->control_state.complete = NULL;
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break;
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default:
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stall_transaction(usbd_dev);
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}
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}
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void _usbd_control_in(usbd_device *usbd_dev, uint8_t ea)
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{
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(void)ea;
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struct usb_setup_data *req = &(usbd_dev->control_state.req);
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switch (usbd_dev->control_state.state) {
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case DATA_IN:
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usb_control_send_chunk(usbd_dev);
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break;
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case LAST_DATA_IN:
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usbd_dev->control_state.state = STATUS_OUT;
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usbd_ep_nak_set(usbd_dev, 0, 0);
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break;
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case STATUS_IN:
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if (usbd_dev->control_state.complete) {
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usbd_dev->control_state.complete(usbd_dev,
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&(usbd_dev->control_state.req));
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}
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/* Exception: Handle SET ADDRESS function here... */
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if ((req->bmRequestType == 0) &&
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(req->bRequest == USB_REQ_SET_ADDRESS)) {
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usbd_dev->driver->set_address(usbd_dev, req->wValue);
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}
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usbd_dev->control_state.state = IDLE;
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break;
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default:
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stall_transaction(usbd_dev);
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}
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}
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