/* * 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  2int 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);}