hw/usb.c

   1 /*
   2  * QEMU USB emulation
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * 2008 Generic packet handler rewrite by Max Krasnyansky
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26 #include "qemu-common.h"
  27 #include "usb.h"
  28 #include "iov.h"
  29
  30 void usb_attach(USBPort *port)
  31 {
  32     USBDevice *dev = port->dev;
  33
  34     assert(dev != NULL);
  35     assert(dev->attached);
  36     assert(dev->state == USB_STATE_NOTATTACHED);
  37     port->ops->attach(port);
  38     usb_send_msg(dev, USB_MSG_ATTACH);
  39 }
  40
  41 void usb_detach(USBPort *port)
  42 {
  43     USBDevice *dev = port->dev;
  44
  45     assert(dev != NULL);
  46     assert(dev->state != USB_STATE_NOTATTACHED);
  47     port->ops->detach(port);
  48     usb_send_msg(dev, USB_MSG_DETACH);
  49 }
  50
  51 void usb_reset(USBPort *port)
  52 {
  53     USBDevice *dev = port->dev;
  54
  55     assert(dev != NULL);
  56     usb_detach(port);
  57     usb_attach(port);
  58     usb_send_msg(dev, USB_MSG_RESET);
  59 }
  60
  61 void usb_wakeup(USBDevice *dev)
  62 {
  63     if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
  64         dev->port->ops->wakeup(dev->port);
  65     }
  66 }
  67
  68 /**********************/
  69
  70 /* generic USB device helpers (you are not forced to use them when
  71    writing your USB device driver, but they help handling the
  72    protocol)
  73 */
  74
  75 #define SETUP_STATE_IDLE  0
  76 #define SETUP_STATE_SETUP 1
  77 #define SETUP_STATE_DATA  2
  78 #define SETUP_STATE_ACK   3
  79
  80 static int do_token_setup(USBDevice *s, USBPacket *p)
  81 {
  82     int request, value, index;
  83     int ret = 0;
  84
  85     if (p->iov.size != 8) {
  86         return USB_RET_STALL;
  87     }
  88
  89     usb_packet_copy(p, s->setup_buf, p->iov.size);
  90     s->setup_len   = (s->setup_buf[7] << 8) | s->setup_buf[6];
  91     s->setup_index = 0;
  92
  93     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
  94     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
  95     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
  96
  97     if (s->setup_buf[0] & USB_DIR_IN) {
  98         ret = s->info->handle_control(s, p, request, value, index,
  99                                       s->setup_len, s->data_buf);
 100         if (ret == USB_RET_ASYNC) {
 101              s->setup_state = SETUP_STATE_SETUP;
 102              return USB_RET_ASYNC;
 103         }
 104         if (ret < 0)
 105             return ret;
 106
 107         if (ret < s->setup_len)
 108             s->setup_len = ret;
 109         s->setup_state = SETUP_STATE_DATA;
 110     } else {
 111         if (s->setup_len > sizeof(s->data_buf)) {
 112             fprintf(stderr,
 113                 "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
 114                 s->setup_len, sizeof(s->data_buf));
 115             return USB_RET_STALL;
 116         }
 117         if (s->setup_len == 0)
 118             s->setup_state = SETUP_STATE_ACK;
 119         else
 120             s->setup_state = SETUP_STATE_DATA;
 121     }
 122
 123     return ret;
 124 }
 125
 126 static int do_token_in(USBDevice *s, USBPacket *p)
 127 {
 128     int request, value, index;
 129     int ret = 0;
 130
 131     if (p->devep != 0)
 132         return s->info->handle_data(s, p);
 133
 134     request = (s->setup_buf[0] << 8) | s->setup_buf[1];
 135     value   = (s->setup_buf[3] << 8) | s->setup_buf[2];
 136     index   = (s->setup_buf[5] << 8) | s->setup_buf[4];
 137
 138     switch(s->setup_state) {
 139     case SETUP_STATE_ACK:
 140         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 141             ret = s->info->handle_control(s, p, request, value, index,
 142                                           s->setup_len, s->data_buf);
 143             if (ret == USB_RET_ASYNC) {
 144                 return USB_RET_ASYNC;
 145             }
 146             s->setup_state = SETUP_STATE_IDLE;
 147             if (ret > 0)
 148                 return 0;
 149             return ret;
 150         }
 151
 152         /* return 0 byte */
 153         return 0;
 154
 155     case SETUP_STATE_DATA:
 156         if (s->setup_buf[0] & USB_DIR_IN) {
 157             int len = s->setup_len - s->setup_index;
 158             if (len > p->iov.size) {
 159                 len = p->iov.size;
 160             }
 161             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 162             s->setup_index += len;
 163             if (s->setup_index >= s->setup_len)
 164                 s->setup_state = SETUP_STATE_ACK;
 165             return len;
 166         }
 167
 168         s->setup_state = SETUP_STATE_IDLE;
 169         return USB_RET_STALL;
 170
 171     default:
 172         return USB_RET_STALL;
 173     }
 174 }
 175
 176 static int do_token_out(USBDevice *s, USBPacket *p)
 177 {
 178     if (p->devep != 0)
 179         return s->info->handle_data(s, p);
 180
 181     switch(s->setup_state) {
 182     case SETUP_STATE_ACK:
 183         if (s->setup_buf[0] & USB_DIR_IN) {
 184             s->setup_state = SETUP_STATE_IDLE;
 185             /* transfer OK */
 186         } else {
 187             /* ignore additional output */
 188         }
 189         return 0;
 190
 191     case SETUP_STATE_DATA:
 192         if (!(s->setup_buf[0] & USB_DIR_IN)) {
 193             int len = s->setup_len - s->setup_index;
 194             if (len > p->iov.size) {
 195                 len = p->iov.size;
 196             }
 197             usb_packet_copy(p, s->data_buf + s->setup_index, len);
 198             s->setup_index += len;
 199             if (s->setup_index >= s->setup_len)
 200                 s->setup_state = SETUP_STATE_ACK;
 201             return len;
 202         }
 203
 204         s->setup_state = SETUP_STATE_IDLE;
 205         return USB_RET_STALL;
 206
 207     default:
 208         return USB_RET_STALL;
 209     }
 210 }
 211
 212 /*
 213  * Generic packet handler.
 214  * Called by the HC (host controller).
 215  *
 216  * Returns length of the transaction or one of the USB_RET_XXX codes.
 217  */
 218 int usb_generic_handle_packet(USBDevice *s, USBPacket *p)
 219 {
 220     switch(p->pid) {
 221     case USB_MSG_ATTACH:
 222         s->state = USB_STATE_ATTACHED;
 223         if (s->info->handle_attach) {
 224             s->info->handle_attach(s);
 225         }
 226         return 0;
 227
 228     case USB_MSG_DETACH:
 229         s->state = USB_STATE_NOTATTACHED;
 230         return 0;
 231
 232     case USB_MSG_RESET:
 233         s->remote_wakeup = 0;
 234         s->addr = 0;
 235         s->state = USB_STATE_DEFAULT;
 236         if (s->info->handle_reset) {
 237             s->info->handle_reset(s);
 238         }
 239         return 0;
 240     }
 241
 242     /* Rest of the PIDs must match our address */
 243     if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr)
 244         return USB_RET_NODEV;
 245
 246     switch (p->pid) {
 247     case USB_TOKEN_SETUP:
 248         return do_token_setup(s, p);
 249
 250     case USB_TOKEN_IN:
 251         return do_token_in(s, p);
 252
 253     case USB_TOKEN_OUT:
 254         return do_token_out(s, p);
 255
 256     default:
 257         return USB_RET_STALL;
 258     }
 259 }
 260
 261 /* ctrl complete function for devices which use usb_generic_handle_packet and
 262    may return USB_RET_ASYNC from their handle_control callback. Device code
 263    which does this *must* call this function instead of the normal
 264    usb_packet_complete to complete their async control packets. */
 265 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
 266 {
 267     if (p->result < 0) {
 268         s->setup_state = SETUP_STATE_IDLE;
 269     }
 270
 271     switch (s->setup_state) {
 272     case SETUP_STATE_SETUP:
 273         if (p->result < s->setup_len) {
 274             s->setup_len = p->result;
 275         }
 276         s->setup_state = SETUP_STATE_DATA;
 277         p->result = 8;
 278         break;
 279
 280     case SETUP_STATE_ACK:
 281         s->setup_state = SETUP_STATE_IDLE;
 282         p->result = 0;
 283         break;
 284
 285     default:
 286         break;
 287     }
 288     usb_packet_complete(s, p);
 289 }
 290
 291 /* XXX: fix overflow */
 292 int set_usb_string(uint8_t *buf, const char *str)
 293 {
 294     int len, i;
 295     uint8_t *q;
 296
 297     q = buf;
 298     len = strlen(str);
 299     *q++ = 2 * len + 2;
 300     *q++ = 3;
 301     for(i = 0; i < len; i++) {
 302         *q++ = str[i];
 303         *q++ = 0;
 304     }
 305     return q - buf;
 306 }
 307
 308 /* Send an internal message to a USB device.  */
 309 void usb_send_msg(USBDevice *dev, int msg)
 310 {
 311     USBPacket p;
 312     int ret;
 313
 314     memset(&p, 0, sizeof(p));
 315     p.pid = msg;
 316     ret = usb_handle_packet(dev, &p);
 317     /* This _must_ be synchronous */
 318     assert(ret != USB_RET_ASYNC);
 319 }
 320
 321 /* Hand over a packet to a device for processing.  Return value
 322    USB_RET_ASYNC indicates the processing isn't finished yet, the
 323    driver will call usb_packet_complete() when done processing it. */
 324 int usb_handle_packet(USBDevice *dev, USBPacket *p)
 325 {
 326     int ret;
 327
 328     assert(p->owner == NULL);
 329     ret = dev->info->handle_packet(dev, p);
 330     if (ret == USB_RET_ASYNC) {
 331         if (p->owner == NULL) {
 332             p->owner = dev;
 333         } else {
 334             /* We'll end up here when usb_handle_packet is called
 335              * recursively due to a hub being in the chain.  Nothing
 336              * to do.  Leave p->owner pointing to the device, not the
 337              * hub. */;
 338         }
 339     }
 340     return ret;
 341 }
 342
 343 /* Notify the controller that an async packet is complete.  This should only
 344    be called for packets previously deferred by returning USB_RET_ASYNC from
 345    handle_packet. */
 346 void usb_packet_complete(USBDevice *dev, USBPacket *p)
 347 {
 348     /* Note: p->owner != dev is possible in case dev is a hub */
 349     assert(p->owner != NULL);
 350     p->owner = NULL;
 351     dev->port->ops->complete(dev->port, p);
 352 }
 353
 354 /* Cancel an active packet.  The packed must have been deferred by
 355    returning USB_RET_ASYNC from handle_packet, and not yet
 356    completed.  */
 357 void usb_cancel_packet(USBPacket * p)
 358 {
 359     assert(p->owner != NULL);
 360     p->owner->info->cancel_packet(p->owner, p);
 361     p->owner = NULL;
 362 }
 363
 364
 365 void usb_packet_init(USBPacket *p)
 366 {
 367     qemu_iovec_init(&p->iov, 1);
 368 }
 369
 370 void usb_packet_setup(USBPacket *p, int pid, uint8_t addr, uint8_t ep)
 371 {
 372     p->pid = pid;
 373     p->devaddr = addr;
 374     p->devep = ep;
 375     p->result = 0;
 376     qemu_iovec_reset(&p->iov);
 377 }
 378
 379 void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
 380 {
 381     qemu_iovec_add(&p->iov, ptr, len);
 382 }
 383
 384 void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
 385 {
 386     assert(p->result >= 0);
 387     assert(p->result + bytes <= p->iov.size);
 388     switch (p->pid) {
 389     case USB_TOKEN_SETUP:
 390     case USB_TOKEN_OUT:
 391         iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
 392         break;
 393     case USB_TOKEN_IN:
 394         iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
 395         break;
 396     default:
 397         fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
 398         abort();
 399     }
 400     p->result += bytes;
 401 }
 402
 403 void usb_packet_skip(USBPacket *p, size_t bytes)
 404 {
 405     assert(p->result >= 0);
 406     assert(p->result + bytes <= p->iov.size);
 407     if (p->pid == USB_TOKEN_IN) {
 408         iov_clear(p->iov.iov, p->iov.niov, p->result, bytes);
 409     }
 410     p->result += bytes;
 411 }
 412
 413 void usb_packet_cleanup(USBPacket *p)
 414 {
 415     qemu_iovec_destroy(&p->iov);
 416 }