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/*
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* QEMU USB emulation
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*
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* Copyright (c) 2005 Fabrice Bellard
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*
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* 2008 Generic packet handler rewrite by Max Krasnyansky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
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#include "usb.h" |
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#include "iov.h" |
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void usb_attach(USBPort *port)
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{ |
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USBDevice *dev = port->dev; |
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assert(dev != NULL);
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assert(dev->attached); |
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assert(dev->state == USB_STATE_NOTATTACHED); |
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port->ops->attach(port); |
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dev->state = USB_STATE_ATTACHED; |
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usb_device_handle_attach(dev); |
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} |
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|
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void usb_detach(USBPort *port)
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{ |
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USBDevice *dev = port->dev; |
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assert(dev != NULL);
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assert(dev->state != USB_STATE_NOTATTACHED); |
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port->ops->detach(port); |
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dev->state = USB_STATE_NOTATTACHED; |
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} |
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|
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void usb_port_reset(USBPort *port)
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{ |
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USBDevice *dev = port->dev; |
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assert(dev != NULL);
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usb_detach(port); |
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usb_attach(port); |
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usb_device_reset(dev); |
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} |
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void usb_device_reset(USBDevice *dev)
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{ |
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if (dev == NULL || !dev->attached) { |
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return;
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} |
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dev->remote_wakeup = 0;
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dev->addr = 0;
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dev->state = USB_STATE_DEFAULT; |
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usb_device_handle_reset(dev); |
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} |
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void usb_wakeup(USBEndpoint *ep)
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{ |
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USBDevice *dev = ep->dev; |
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USBBus *bus = usb_bus_from_device(dev); |
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if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
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dev->port->ops->wakeup(dev->port); |
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} |
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if (bus->ops->wakeup_endpoint) {
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bus->ops->wakeup_endpoint(bus, ep); |
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} |
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} |
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/**********************/
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/* generic USB device helpers (you are not forced to use them when
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writing your USB device driver, but they help handling the
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protocol)
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*/
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#define SETUP_STATE_IDLE 0 |
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#define SETUP_STATE_SETUP 1 |
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#define SETUP_STATE_DATA 2 |
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#define SETUP_STATE_ACK 3 |
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static int do_token_setup(USBDevice *s, USBPacket *p) |
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{ |
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int request, value, index;
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int ret = 0; |
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if (p->iov.size != 8) { |
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return USB_RET_STALL;
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} |
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usb_packet_copy(p, s->setup_buf, p->iov.size); |
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s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6]; |
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s->setup_index = 0;
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request = (s->setup_buf[0] << 8) | s->setup_buf[1]; |
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value = (s->setup_buf[3] << 8) | s->setup_buf[2]; |
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index = (s->setup_buf[5] << 8) | s->setup_buf[4]; |
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if (s->setup_buf[0] & USB_DIR_IN) { |
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ret = usb_device_handle_control(s, p, request, value, index, |
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s->setup_len, s->data_buf); |
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if (ret == USB_RET_ASYNC) {
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s->setup_state = SETUP_STATE_SETUP; |
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return USB_RET_ASYNC;
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} |
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if (ret < 0) |
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return ret;
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if (ret < s->setup_len)
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s->setup_len = ret; |
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s->setup_state = SETUP_STATE_DATA; |
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} else {
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if (s->setup_len > sizeof(s->data_buf)) { |
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fprintf(stderr, |
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"usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
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s->setup_len, sizeof(s->data_buf));
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return USB_RET_STALL;
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} |
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if (s->setup_len == 0) |
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s->setup_state = SETUP_STATE_ACK; |
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else
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s->setup_state = SETUP_STATE_DATA; |
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} |
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return ret;
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} |
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static int do_token_in(USBDevice *s, USBPacket *p) |
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{ |
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int request, value, index;
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int ret = 0; |
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assert(p->ep->nr == 0);
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request = (s->setup_buf[0] << 8) | s->setup_buf[1]; |
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value = (s->setup_buf[3] << 8) | s->setup_buf[2]; |
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index = (s->setup_buf[5] << 8) | s->setup_buf[4]; |
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switch(s->setup_state) {
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case SETUP_STATE_ACK:
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if (!(s->setup_buf[0] & USB_DIR_IN)) { |
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ret = usb_device_handle_control(s, p, request, value, index, |
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s->setup_len, s->data_buf); |
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if (ret == USB_RET_ASYNC) {
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return USB_RET_ASYNC;
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} |
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s->setup_state = SETUP_STATE_IDLE; |
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if (ret > 0) |
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return 0; |
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return ret;
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} |
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/* return 0 byte */
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return 0; |
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case SETUP_STATE_DATA:
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if (s->setup_buf[0] & USB_DIR_IN) { |
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int len = s->setup_len - s->setup_index;
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if (len > p->iov.size) {
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len = p->iov.size; |
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} |
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usb_packet_copy(p, s->data_buf + s->setup_index, len); |
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s->setup_index += len; |
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if (s->setup_index >= s->setup_len)
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s->setup_state = SETUP_STATE_ACK; |
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return len;
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} |
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s->setup_state = SETUP_STATE_IDLE; |
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return USB_RET_STALL;
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default:
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return USB_RET_STALL;
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} |
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} |
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static int do_token_out(USBDevice *s, USBPacket *p) |
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{ |
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assert(p->ep->nr == 0);
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switch(s->setup_state) {
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case SETUP_STATE_ACK:
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if (s->setup_buf[0] & USB_DIR_IN) { |
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s->setup_state = SETUP_STATE_IDLE; |
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/* transfer OK */
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} else {
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/* ignore additional output */
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} |
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return 0; |
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case SETUP_STATE_DATA:
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if (!(s->setup_buf[0] & USB_DIR_IN)) { |
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int len = s->setup_len - s->setup_index;
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if (len > p->iov.size) {
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len = p->iov.size; |
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} |
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usb_packet_copy(p, s->data_buf + s->setup_index, len); |
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s->setup_index += len; |
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if (s->setup_index >= s->setup_len)
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s->setup_state = SETUP_STATE_ACK; |
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return len;
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} |
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s->setup_state = SETUP_STATE_IDLE; |
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return USB_RET_STALL;
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default:
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return USB_RET_STALL;
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} |
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} |
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/* ctrl complete function for devices which use usb_generic_handle_packet and
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may return USB_RET_ASYNC from their handle_control callback. Device code
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which does this *must* call this function instead of the normal
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usb_packet_complete to complete their async control packets. */
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void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
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{ |
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if (p->result < 0) { |
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s->setup_state = SETUP_STATE_IDLE; |
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} |
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switch (s->setup_state) {
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case SETUP_STATE_SETUP:
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if (p->result < s->setup_len) {
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s->setup_len = p->result; |
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} |
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s->setup_state = SETUP_STATE_DATA; |
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p->result = 8;
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break;
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case SETUP_STATE_ACK:
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s->setup_state = SETUP_STATE_IDLE; |
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p->result = 0;
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break;
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default:
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break;
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} |
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usb_packet_complete(s, p); |
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} |
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/* XXX: fix overflow */
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int set_usb_string(uint8_t *buf, const char *str) |
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{ |
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int len, i;
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uint8_t *q; |
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q = buf; |
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len = strlen(str); |
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*q++ = 2 * len + 2; |
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*q++ = 3;
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for(i = 0; i < len; i++) { |
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*q++ = str[i]; |
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*q++ = 0;
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} |
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return q - buf;
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} |
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USBDevice *usb_find_device(USBPort *port, uint8_t addr) |
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{ |
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USBDevice *dev = port->dev; |
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if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) { |
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return NULL; |
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} |
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if (dev->addr == addr) {
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return dev;
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} |
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return usb_device_find_device(dev, addr);
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} |
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static int usb_process_one(USBPacket *p) |
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{ |
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USBDevice *dev = p->ep->dev; |
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if (p->ep->nr == 0) { |
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/* control pipe */
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switch (p->pid) {
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case USB_TOKEN_SETUP:
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return do_token_setup(dev, p);
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case USB_TOKEN_IN:
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return do_token_in(dev, p);
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case USB_TOKEN_OUT:
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return do_token_out(dev, p);
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default:
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return USB_RET_STALL;
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} |
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} else {
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/* data pipe */
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return usb_device_handle_data(dev, p);
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} |
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} |
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/* Hand over a packet to a device for processing. Return value
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USB_RET_ASYNC indicates the processing isn't finished yet, the
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driver will call usb_packet_complete() when done processing it. */
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int usb_handle_packet(USBDevice *dev, USBPacket *p)
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{ |
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int ret;
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if (dev == NULL) { |
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return USB_RET_NODEV;
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} |
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assert(dev == p->ep->dev); |
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assert(dev->state == USB_STATE_DEFAULT); |
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assert(p->state == USB_PACKET_SETUP); |
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assert(p->ep != NULL);
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if (QTAILQ_EMPTY(&p->ep->queue)) {
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ret = usb_process_one(p); |
327 |
if (ret == USB_RET_ASYNC) {
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usb_packet_set_state(p, USB_PACKET_ASYNC); |
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QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue); |
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} else {
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p->result = ret; |
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usb_packet_set_state(p, USB_PACKET_COMPLETE); |
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} |
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} else {
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ret = USB_RET_ASYNC; |
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usb_packet_set_state(p, USB_PACKET_QUEUED); |
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QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue); |
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} |
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return ret;
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} |
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/* Notify the controller that an async packet is complete. This should only
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be called for packets previously deferred by returning USB_RET_ASYNC from
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handle_packet. */
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void usb_packet_complete(USBDevice *dev, USBPacket *p)
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{ |
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USBEndpoint *ep = p->ep; |
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int ret;
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assert(p->state == USB_PACKET_ASYNC); |
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assert(QTAILQ_FIRST(&ep->queue) == p); |
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usb_packet_set_state(p, USB_PACKET_COMPLETE); |
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QTAILQ_REMOVE(&ep->queue, p, queue); |
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dev->port->ops->complete(dev->port, p); |
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while (!QTAILQ_EMPTY(&ep->queue)) {
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p = QTAILQ_FIRST(&ep->queue); |
358 |
assert(p->state == USB_PACKET_QUEUED); |
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ret = usb_process_one(p); |
360 |
if (ret == USB_RET_ASYNC) {
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usb_packet_set_state(p, USB_PACKET_ASYNC); |
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break;
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} |
364 |
p->result = ret; |
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usb_packet_set_state(p, USB_PACKET_COMPLETE); |
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QTAILQ_REMOVE(&ep->queue, p, queue); |
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dev->port->ops->complete(dev->port, p); |
368 |
} |
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} |
370 |
|
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/* Cancel an active packet. The packed must have been deferred by
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returning USB_RET_ASYNC from handle_packet, and not yet
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completed. */
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void usb_cancel_packet(USBPacket * p)
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{ |
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bool callback = (p->state == USB_PACKET_ASYNC);
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assert(usb_packet_is_inflight(p)); |
378 |
usb_packet_set_state(p, USB_PACKET_CANCELED); |
379 |
QTAILQ_REMOVE(&p->ep->queue, p, queue); |
380 |
if (callback) {
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usb_device_cancel_packet(p->ep->dev, p); |
382 |
} |
383 |
} |
384 |
|
385 |
|
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void usb_packet_init(USBPacket *p)
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{ |
388 |
qemu_iovec_init(&p->iov, 1);
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389 |
} |
390 |
|
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void usb_packet_set_state(USBPacket *p, USBPacketState state)
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{ |
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#ifdef DEBUG
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static const char *name[] = { |
395 |
[USB_PACKET_UNDEFINED] = "undef",
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[USB_PACKET_SETUP] = "setup",
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[USB_PACKET_QUEUED] = "queued",
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[USB_PACKET_ASYNC] = "async",
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399 |
[USB_PACKET_COMPLETE] = "complete",
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400 |
[USB_PACKET_CANCELED] = "canceled",
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}; |
402 |
static const char *rets[] = { |
403 |
[-USB_RET_NODEV] = "NODEV",
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404 |
[-USB_RET_NAK] = "NAK",
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405 |
[-USB_RET_STALL] = "STALL",
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406 |
[-USB_RET_BABBLE] = "BABBLE",
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407 |
[-USB_RET_ASYNC] = "ASYNC",
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408 |
}; |
409 |
char add[16] = ""; |
410 |
|
411 |
if (state == USB_PACKET_COMPLETE) {
|
412 |
if (p->result < 0) { |
413 |
snprintf(add, sizeof(add), " - %s", rets[-p->result]); |
414 |
} else {
|
415 |
snprintf(add, sizeof(add), " - %d", p->result); |
416 |
} |
417 |
} |
418 |
fprintf(stderr, "bus %s, port %s, dev %d, ep %d: packet %p: %s -> %s%s\n",
|
419 |
p->ep->dev->qdev.parent_bus->name, |
420 |
p->ep->dev->port->path, |
421 |
p->ep->dev->addr, p->ep->nr, |
422 |
p, name[p->state], name[state], add); |
423 |
#endif
|
424 |
p->state = state; |
425 |
} |
426 |
|
427 |
void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep) |
428 |
{ |
429 |
assert(!usb_packet_is_inflight(p)); |
430 |
p->pid = pid; |
431 |
p->ep = ep; |
432 |
p->result = 0;
|
433 |
qemu_iovec_reset(&p->iov); |
434 |
usb_packet_set_state(p, USB_PACKET_SETUP); |
435 |
} |
436 |
|
437 |
void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len) |
438 |
{ |
439 |
qemu_iovec_add(&p->iov, ptr, len); |
440 |
} |
441 |
|
442 |
void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes) |
443 |
{ |
444 |
assert(p->result >= 0);
|
445 |
assert(p->result + bytes <= p->iov.size); |
446 |
switch (p->pid) {
|
447 |
case USB_TOKEN_SETUP:
|
448 |
case USB_TOKEN_OUT:
|
449 |
iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes); |
450 |
break;
|
451 |
case USB_TOKEN_IN:
|
452 |
iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes); |
453 |
break;
|
454 |
default:
|
455 |
fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
|
456 |
abort(); |
457 |
} |
458 |
p->result += bytes; |
459 |
} |
460 |
|
461 |
void usb_packet_skip(USBPacket *p, size_t bytes)
|
462 |
{ |
463 |
assert(p->result >= 0);
|
464 |
assert(p->result + bytes <= p->iov.size); |
465 |
if (p->pid == USB_TOKEN_IN) {
|
466 |
iov_clear(p->iov.iov, p->iov.niov, p->result, bytes); |
467 |
} |
468 |
p->result += bytes; |
469 |
} |
470 |
|
471 |
void usb_packet_cleanup(USBPacket *p)
|
472 |
{ |
473 |
assert(!usb_packet_is_inflight(p)); |
474 |
qemu_iovec_destroy(&p->iov); |
475 |
} |
476 |
|
477 |
void usb_ep_init(USBDevice *dev)
|
478 |
{ |
479 |
int ep;
|
480 |
|
481 |
dev->ep_ctl.nr = 0;
|
482 |
dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL; |
483 |
dev->ep_ctl.ifnum = 0;
|
484 |
dev->ep_ctl.dev = dev; |
485 |
QTAILQ_INIT(&dev->ep_ctl.queue); |
486 |
for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) { |
487 |
dev->ep_in[ep].nr = ep + 1;
|
488 |
dev->ep_out[ep].nr = ep + 1;
|
489 |
dev->ep_in[ep].pid = USB_TOKEN_IN; |
490 |
dev->ep_out[ep].pid = USB_TOKEN_OUT; |
491 |
dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID; |
492 |
dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID; |
493 |
dev->ep_in[ep].ifnum = 0;
|
494 |
dev->ep_out[ep].ifnum = 0;
|
495 |
dev->ep_in[ep].dev = dev; |
496 |
dev->ep_out[ep].dev = dev; |
497 |
QTAILQ_INIT(&dev->ep_in[ep].queue); |
498 |
QTAILQ_INIT(&dev->ep_out[ep].queue); |
499 |
} |
500 |
} |
501 |
|
502 |
void usb_ep_dump(USBDevice *dev)
|
503 |
{ |
504 |
static const char *tname[] = { |
505 |
[USB_ENDPOINT_XFER_CONTROL] = "control",
|
506 |
[USB_ENDPOINT_XFER_ISOC] = "isoc",
|
507 |
[USB_ENDPOINT_XFER_BULK] = "bulk",
|
508 |
[USB_ENDPOINT_XFER_INT] = "int",
|
509 |
}; |
510 |
int ifnum, ep, first;
|
511 |
|
512 |
fprintf(stderr, "Device \"%s\", config %d\n",
|
513 |
dev->product_desc, dev->configuration); |
514 |
for (ifnum = 0; ifnum < 16; ifnum++) { |
515 |
first = 1;
|
516 |
for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) { |
517 |
if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
|
518 |
dev->ep_in[ep].ifnum == ifnum) { |
519 |
if (first) {
|
520 |
first = 0;
|
521 |
fprintf(stderr, " Interface %d, alternative %d\n",
|
522 |
ifnum, dev->altsetting[ifnum]); |
523 |
} |
524 |
fprintf(stderr, " Endpoint %d, IN, %s, %d max\n", ep,
|
525 |
tname[dev->ep_in[ep].type], |
526 |
dev->ep_in[ep].max_packet_size); |
527 |
} |
528 |
if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
|
529 |
dev->ep_out[ep].ifnum == ifnum) { |
530 |
if (first) {
|
531 |
first = 0;
|
532 |
fprintf(stderr, " Interface %d, alternative %d\n",
|
533 |
ifnum, dev->altsetting[ifnum]); |
534 |
} |
535 |
fprintf(stderr, " Endpoint %d, OUT, %s, %d max\n", ep,
|
536 |
tname[dev->ep_out[ep].type], |
537 |
dev->ep_out[ep].max_packet_size); |
538 |
} |
539 |
} |
540 |
} |
541 |
fprintf(stderr, "--\n");
|
542 |
} |
543 |
|
544 |
struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep) |
545 |
{ |
546 |
struct USBEndpoint *eps;
|
547 |
|
548 |
if (dev == NULL) { |
549 |
return NULL; |
550 |
} |
551 |
eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out; |
552 |
if (ep == 0) { |
553 |
return &dev->ep_ctl;
|
554 |
} |
555 |
assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT); |
556 |
assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
|
557 |
return eps + ep - 1; |
558 |
} |
559 |
|
560 |
uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep) |
561 |
{ |
562 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
563 |
return uep->type;
|
564 |
} |
565 |
|
566 |
void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type) |
567 |
{ |
568 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
569 |
uep->type = type; |
570 |
} |
571 |
|
572 |
uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep) |
573 |
{ |
574 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
575 |
return uep->ifnum;
|
576 |
} |
577 |
|
578 |
void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum) |
579 |
{ |
580 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
581 |
uep->ifnum = ifnum; |
582 |
} |
583 |
|
584 |
void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep, |
585 |
uint16_t raw) |
586 |
{ |
587 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
588 |
int size, microframes;
|
589 |
|
590 |
size = raw & 0x7ff;
|
591 |
switch ((raw >> 11) & 3) { |
592 |
case 1: |
593 |
microframes = 2;
|
594 |
break;
|
595 |
case 2: |
596 |
microframes = 3;
|
597 |
break;
|
598 |
default:
|
599 |
microframes = 1;
|
600 |
break;
|
601 |
} |
602 |
uep->max_packet_size = size * microframes; |
603 |
} |
604 |
|
605 |
int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep) |
606 |
{ |
607 |
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
|
608 |
return uep->max_packet_size;
|
609 |
} |