qemu/hw/usb.c

205 lines
6.5 KiB
C

/*
* QEMU USB emulation
*
* Copyright (c) 2005 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "usb.h"
void usb_attach(USBPort *port, USBDevice *dev)
{
port->attach(port, dev);
}
/**********************/
/* generic USB device helpers (you are not forced to use them when
writing your USB device driver, but they help handling the
protocol)
*/
#define SETUP_STATE_IDLE 0
#define SETUP_STATE_DATA 1
#define SETUP_STATE_ACK 2
int usb_generic_handle_packet(USBDevice *s, USBPacket *p)
{
int l, ret = 0;
int len = p->len;
uint8_t *data = p->data;
switch(p->pid) {
case USB_MSG_ATTACH:
s->state = USB_STATE_ATTACHED;
break;
case USB_MSG_DETACH:
s->state = USB_STATE_NOTATTACHED;
break;
case USB_MSG_RESET:
s->remote_wakeup = 0;
s->addr = 0;
s->state = USB_STATE_DEFAULT;
s->handle_reset(s);
break;
case USB_TOKEN_SETUP:
if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr)
return USB_RET_NODEV;
if (len != 8)
goto fail;
memcpy(s->setup_buf, data, 8);
s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
s->setup_index = 0;
if (s->setup_buf[0] & USB_DIR_IN) {
ret = s->handle_control(s,
(s->setup_buf[0] << 8) | s->setup_buf[1],
(s->setup_buf[3] << 8) | s->setup_buf[2],
(s->setup_buf[5] << 8) | s->setup_buf[4],
s->setup_len,
s->data_buf);
if (ret < 0)
return ret;
if (ret < s->setup_len)
s->setup_len = ret;
s->setup_state = SETUP_STATE_DATA;
} else {
if (s->setup_len == 0)
s->setup_state = SETUP_STATE_ACK;
else
s->setup_state = SETUP_STATE_DATA;
}
break;
case USB_TOKEN_IN:
if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr)
return USB_RET_NODEV;
switch(p->devep) {
case 0:
switch(s->setup_state) {
case SETUP_STATE_ACK:
if (!(s->setup_buf[0] & USB_DIR_IN)) {
s->setup_state = SETUP_STATE_IDLE;
ret = s->handle_control(s,
(s->setup_buf[0] << 8) | s->setup_buf[1],
(s->setup_buf[3] << 8) | s->setup_buf[2],
(s->setup_buf[5] << 8) | s->setup_buf[4],
s->setup_len,
s->data_buf);
if (ret > 0)
ret = 0;
} else {
/* return 0 byte */
}
break;
case SETUP_STATE_DATA:
if (s->setup_buf[0] & USB_DIR_IN) {
l = s->setup_len - s->setup_index;
if (l > len)
l = len;
memcpy(data, s->data_buf + s->setup_index, l);
s->setup_index += l;
if (s->setup_index >= s->setup_len)
s->setup_state = SETUP_STATE_ACK;
ret = l;
} else {
s->setup_state = SETUP_STATE_IDLE;
goto fail;
}
break;
default:
goto fail;
}
break;
default:
ret = s->handle_data(s, p);
break;
}
break;
case USB_TOKEN_OUT:
if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr)
return USB_RET_NODEV;
switch(p->devep) {
case 0:
switch(s->setup_state) {
case SETUP_STATE_ACK:
if (s->setup_buf[0] & USB_DIR_IN) {
s->setup_state = SETUP_STATE_IDLE;
/* transfer OK */
} else {
/* ignore additional output */
}
break;
case SETUP_STATE_DATA:
if (!(s->setup_buf[0] & USB_DIR_IN)) {
l = s->setup_len - s->setup_index;
if (l > len)
l = len;
memcpy(s->data_buf + s->setup_index, data, l);
s->setup_index += l;
if (s->setup_index >= s->setup_len)
s->setup_state = SETUP_STATE_ACK;
ret = l;
} else {
s->setup_state = SETUP_STATE_IDLE;
goto fail;
}
break;
default:
goto fail;
}
break;
default:
ret = s->handle_data(s, p);
break;
}
break;
default:
fail:
ret = USB_RET_STALL;
break;
}
return ret;
}
/* XXX: fix overflow */
int set_usb_string(uint8_t *buf, const char *str)
{
int len, i;
uint8_t *q;
q = buf;
len = strlen(str);
*q++ = 2 * len + 2;
*q++ = 3;
for(i = 0; i < len; i++) {
*q++ = str[i];
*q++ = 0;
}
return q - buf;
}
/* Send an internal message to a USB device. */
void usb_send_msg(USBDevice *dev, int msg)
{
USBPacket p;
memset(&p, 0, sizeof(p));
p.pid = msg;
dev->handle_packet(dev, &p);
}