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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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void usb_attach(USBPort *port, USBDevice *dev)
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{ |
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port->attach(port, dev); |
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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_DATA 1 |
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#define SETUP_STATE_ACK 2 |
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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->len != 8) |
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return USB_RET_STALL;
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memcpy(s->setup_buf, p->data, 8);
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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 = s->handle_control(s, request, value, index, |
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s->setup_len, s->data_buf); |
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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 == 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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if (p->devep != 0) |
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return s->handle_data(s, p);
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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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s->setup_state = SETUP_STATE_IDLE; |
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ret = s->handle_control(s, request, value, index, |
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s->setup_len, s->data_buf); |
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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->len)
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len = p->len; |
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memcpy(p->data, 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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if (p->devep != 0) |
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return s->handle_data(s, p);
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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->len)
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len = p->len; |
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memcpy(s->data_buf + s->setup_index, p->data, 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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/*
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* Generic packet handler.
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* Called by the HC (host controller).
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*
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* Returns length of the transaction or one of the USB_RET_XXX codes.
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*/
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int usb_generic_handle_packet(USBDevice *s, USBPacket *p)
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{ |
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switch(p->pid) {
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case USB_MSG_ATTACH:
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s->state = USB_STATE_ATTACHED; |
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return 0; |
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case USB_MSG_DETACH:
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s->state = USB_STATE_NOTATTACHED; |
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return 0; |
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case USB_MSG_RESET:
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s->remote_wakeup = 0;
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s->addr = 0;
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s->state = USB_STATE_DEFAULT; |
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s->handle_reset(s); |
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return 0; |
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} |
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/* Rest of the PIDs must match our address */
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if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr)
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return USB_RET_NODEV;
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switch (p->pid) {
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case USB_TOKEN_SETUP:
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return do_token_setup(s, p);
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case USB_TOKEN_IN:
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return do_token_in(s, p);
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case USB_TOKEN_OUT:
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return do_token_out(s, p);
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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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/* 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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/* Send an internal message to a USB device. */
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void usb_send_msg(USBDevice *dev, int msg) |
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{ |
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USBPacket p; |
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memset(&p, 0, sizeof(p)); |
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p.pid = msg; |
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dev->handle_packet(dev, &p); |
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/* This _must_ be synchronous */
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} |