common/cmd_usb.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland
   4  *
   5  * Most of this source has been derived from the Linux USB
   6  * project.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  *
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30 #include <asm/byteorder.h>
  31 #include <part.h>
  32 #include <usb.h>
  33
  34 #ifdef CONFIG_USB_STORAGE
  35 static int usb_stor_curr_dev=-1; /* current device */
  36 #endif
  37
  38 /* some display routines (info command) */
  39 char * usb_get_class_desc(unsigned char dclass)
  40 {
  41         switch(dclass) {
  42                 case USB_CLASS_PER_INTERFACE:
  43                         return("See Interface");
  44                 case USB_CLASS_AUDIO:
  45                         return("Audio");
  46                 case USB_CLASS_COMM:
  47                         return("Communication");
  48                 case USB_CLASS_HID:
  49                         return("Human Interface");
  50                 case USB_CLASS_PRINTER:
  51                         return("Printer");
  52                 case USB_CLASS_MASS_STORAGE:
  53                         return("Mass Storage");
  54                 case USB_CLASS_HUB:
  55                         return("Hub");
  56                 case USB_CLASS_DATA:
  57                         return("CDC Data");
  58                 case USB_CLASS_VENDOR_SPEC:
  59                         return("Vendor specific");
  60                 default :
  61                         return("");
  62         }
  63 }
  64
  65 void usb_display_class_sub(unsigned char dclass,unsigned char subclass,unsigned char proto)
  66 {
  67         switch(dclass) {
  68                 case USB_CLASS_PER_INTERFACE:
  69                         printf("See Interface");
  70                         break;
  71                 case USB_CLASS_HID:
  72                         printf("Human Interface, Subclass: ");
  73                         switch(subclass) {
  74                                 case USB_SUB_HID_NONE:
  75                                         printf("None");
  76                                         break;
  77                                 case USB_SUB_HID_BOOT:
  78                                         printf("Boot ");
  79                                         switch(proto) {
  80                                                 case USB_PROT_HID_NONE:
  81                                                         printf("None");
  82                                                         break;
  83                                                 case USB_PROT_HID_KEYBOARD:
  84                                                         printf("Keyboard");
  85                                                         break;
  86                                                 case USB_PROT_HID_MOUSE:
  87                                                         printf("Mouse");
  88                                                         break;
  89                                                 default:
  90                                                         printf("reserved");
  91                                         }
  92                                         break;
  93                                 default:
  94                                         printf("reserved");
  95                         }
  96                         break;
  97                 case USB_CLASS_MASS_STORAGE:
  98                         printf("Mass Storage, ");
  99                         switch(subclass) {
 100                                 case US_SC_RBC:
 101                                         printf("RBC ");
 102                                         break;
 103                                 case US_SC_8020:
 104                                         printf("SFF-8020i (ATAPI)");
 105                                         break;
 106                                 case US_SC_QIC:
 107                                         printf("QIC-157 (Tape)");
 108                                         break;
 109                                 case US_SC_UFI:
 110                                         printf("UFI");
 111                                         break;
 112                                 case US_SC_8070:
 113                                         printf("SFF-8070");
 114                                         break;
 115                                 case US_SC_SCSI:
 116                                         printf("Transp. SCSI");
 117                                         break;
 118                                 default:
 119                                         printf("reserved");
 120                                         break;
 121                         }
 122                         printf(", ");
 123                         switch(proto) {
 124                                 case US_PR_CB:
 125                                         printf("Command/Bulk");
 126                                         break;
 127                                 case US_PR_CBI:
 128                                         printf("Command/Bulk/Int");
 129                                         break;
 130                                 case US_PR_BULK:
 131                                         printf("Bulk only");
 132                                         break;
 133                                 default:
 134                                         printf("reserved");
 135                         }
 136                         break;
 137                 default:
 138                         printf("%s",usb_get_class_desc(dclass));
 139         }
 140 }
 141
 142 void usb_display_string(struct usb_device *dev,int index)
 143 {
 144         char buffer[256];
 145         if (index!=0) {
 146                 if (usb_string(dev,index,&buffer[0],256)>0);
 147                         printf("String: \"%s\"",buffer);
 148         }
 149 }
 150
 151 void usb_display_desc(struct usb_device *dev)
 152 {
 153         if (dev->descriptor.bDescriptorType==USB_DT_DEVICE) {
 154                 printf("%d: %s,  USB Revision %x.%x\n",dev->devnum,usb_get_class_desc(dev->config.if_desc[0].bInterfaceClass),
 155                         (dev->descriptor.bcdUSB>>8) & 0xff,dev->descriptor.bcdUSB & 0xff);
 156                 if (strlen(dev->mf) || strlen(dev->prod) || strlen(dev->serial))
 157                         printf(" - %s %s %s\n",dev->mf,dev->prod,dev->serial);
 158                 if (dev->descriptor.bDeviceClass) {
 159                         printf(" - Class: ");
 160                         usb_display_class_sub(dev->descriptor.bDeviceClass,dev->descriptor.bDeviceSubClass,dev->descriptor.bDeviceProtocol);
 161                         printf("\n");
 162                 }
 163                 else {
 164                         printf(" - Class: (from Interface) %s\n",usb_get_class_desc(dev->config.if_desc[0].bInterfaceClass));
 165                 }
 166                 printf(" - PacketSize: %d  Configurations: %d\n",dev->descriptor.bMaxPacketSize0,dev->descriptor.bNumConfigurations);
 167                 printf(" - Vendor: 0x%04x  Product 0x%04x Version %d.%d\n",dev->descriptor.idVendor,dev->descriptor.idProduct,(dev->descriptor.bcdDevice>>8) & 0xff,dev->descriptor.bcdDevice & 0xff);
 168         }
 169
 170 }
 171
 172 void usb_display_conf_desc(struct usb_config_descriptor *config,struct usb_device *dev)
 173 {
 174         printf("   Configuration: %d\n",config->bConfigurationValue);
 175         printf("   - Interfaces: %d %s%s%dmA\n",config->bNumInterfaces,(config->bmAttributes & 0x40) ? "Self Powered " : "Bus Powered ",
 176         (config->bmAttributes & 0x20) ? "Remote Wakeup " : "",config->MaxPower*2);
 177         if (config->iConfiguration) {
 178                 printf("   - ");
 179                 usb_display_string(dev,config->iConfiguration);
 180                 printf("\n");
 181         }
 182 }
 183
 184 void usb_display_if_desc(struct usb_interface_descriptor *ifdesc,struct usb_device *dev)
 185 {
 186         printf("     Interface: %d\n",ifdesc->bInterfaceNumber);
 187         printf("     - Alternate Setting %d, Endpoints: %d\n",ifdesc->bAlternateSetting,ifdesc->bNumEndpoints);
 188         printf("     - Class ");
 189         usb_display_class_sub(ifdesc->bInterfaceClass,ifdesc->bInterfaceSubClass,ifdesc->bInterfaceProtocol);
 190         printf("\n");
 191         if (ifdesc->iInterface) {
 192                 printf("     - ");
 193                 usb_display_string(dev,ifdesc->iInterface);
 194                 printf("\n");
 195         }
 196 }
 197
 198 void usb_display_ep_desc(struct usb_endpoint_descriptor *epdesc)
 199 {
 200         printf("     - Endpoint %d %s ",epdesc->bEndpointAddress & 0xf,(epdesc->bEndpointAddress & 0x80) ? "In" : "Out");
 201         switch((epdesc->bmAttributes & 0x03))
 202         {
 203                 case 0: printf("Control"); break;
 204                 case 1: printf("Isochronous"); break;
 205                 case 2: printf("Bulk"); break;
 206                 case 3: printf("Interrupt"); break;
 207         }
 208         printf(" MaxPacket %d",epdesc->wMaxPacketSize);
 209         if ((epdesc->bmAttributes & 0x03)==0x3)
 210                 printf(" Interval %dms",epdesc->bInterval);
 211         printf("\n");
 212 }
 213
 214 /* main routine to diasplay the configs, interfaces and endpoints */
 215 void usb_display_config(struct usb_device *dev)
 216 {
 217         struct usb_config_descriptor *config;
 218         struct usb_interface_descriptor *ifdesc;
 219         struct usb_endpoint_descriptor *epdesc;
 220         int i,ii;
 221
 222         config= &dev->config;
 223         usb_display_conf_desc(config,dev);
 224         for(i=0;i<config->no_of_if;i++) {
 225                 ifdesc= &config->if_desc[i];
 226                 usb_display_if_desc(ifdesc,dev);
 227                 for(ii=0;ii<ifdesc->no_of_ep;ii++) {
 228                         epdesc= &ifdesc->ep_desc[ii];
 229                         usb_display_ep_desc(epdesc);
 230                 }
 231         }
 232         printf("\n");
 233 }
 234
 235 /* shows the device tree recursively */
 236 void usb_show_tree_graph(struct usb_device *dev,char *pre)
 237 {
 238         int i,index;
 239         int has_child,last_child,port;
 240
 241         index=strlen(pre);
 242         printf(" %s",pre);
 243         /* check if the device has connected children */
 244         has_child=0;
 245         for(i=0;i<dev->maxchild;i++) {
 246                 if (dev->children[i]!=NULL)
 247                         has_child=1;
 248         }
 249         /* check if we are the last one */
 250         last_child=1;
 251         if (dev->parent!=NULL) {
 252                 for(i=0;i<dev->parent->maxchild;i++) {
 253                         /* search for children */
 254                         if (dev->parent->children[i]==dev) {
 255                                 /* found our pointer, see if we have a little sister */
 256                                 port=i;
 257                                 while(i++<dev->parent->maxchild) {
 258                                         if (dev->parent->children[i]!=NULL) {
 259                                                 /* found a sister */
 260                                                 last_child=0;
 261                                                 break;
 262                                         } /* if */
 263                                 } /* while */
 264                         } /* device found */
 265                 } /* for all children of the parent */
 266                 printf("\b+-");
 267                 /* correct last child */
 268                 if (last_child) {
 269                         pre[index-1]=' ';
 270                 }
 271         } /* if not root hub */
 272         else
 273                 printf(" ");
 274         printf("%d ",dev->devnum);
 275         pre[index++]=' ';
 276         pre[index++]= has_child ? '|' : ' ';
 277         pre[index]=0;
 278         printf(" %s (%s, %dmA)\n",usb_get_class_desc(dev->config.if_desc[0].bInterfaceClass),
 279                 dev->slow ? "1.5MBit/s" : "12MBit/s",dev->config.MaxPower * 2);
 280         if (strlen(dev->mf) ||
 281            strlen(dev->prod) ||
 282            strlen(dev->serial))
 283                 printf(" %s  %s %s %s\n",pre,dev->mf,dev->prod,dev->serial);
 284         printf(" %s\n",pre);
 285         if (dev->maxchild>0) {
 286                 for(i=0;i<dev->maxchild;i++) {
 287                         if (dev->children[i]!=NULL) {
 288                                 usb_show_tree_graph(dev->children[i],pre);
 289                                 pre[index]=0;
 290                         }
 291                 }
 292         }
 293 }
 294
 295 /* main routine for the tree command */
 296 void usb_show_tree(struct usb_device *dev)
 297 {
 298         char preamble[32];
 299
 300         memset(preamble,0,32);
 301         usb_show_tree_graph(dev,&preamble[0]);
 302 }
 303
 304
 305 /******************************************************************************
 306  * usb boot command intepreter. Derived from diskboot
 307  */
 308 #ifdef CONFIG_USB_STORAGE
 309 int do_usbboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 310 {
 311         char *boot_device = NULL;
 312         char *ep;
 313         int dev, part=1, rcode;
 314         ulong addr, cnt;
 315         disk_partition_t info;
 316         image_header_t *hdr;
 317         block_dev_desc_t *stor_dev;
 318
 319
 320         switch (argc) {
 321         case 1:
 322                 addr = CFG_LOAD_ADDR;
 323                 boot_device = getenv ("bootdevice");
 324                 break;
 325         case 2:
 326                 addr = simple_strtoul(argv[1], NULL, 16);
 327                 boot_device = getenv ("bootdevice");
 328                 break;
 329         case 3:
 330                 addr = simple_strtoul(argv[1], NULL, 16);
 331                 boot_device = argv[2];
 332                 break;
 333         default:
 334                 printf ("Usage:\n%s\n", cmdtp->usage);
 335                 return 1;
 336         }
 337
 338         if (!boot_device) {
 339                 puts ("\n** No boot device **\n");
 340                 return 1;
 341         }
 342
 343         dev = simple_strtoul(boot_device, &ep, 16);
 344         stor_dev=usb_stor_get_dev(dev);
 345         if (stor_dev->type == DEV_TYPE_UNKNOWN) {
 346                 printf ("\n** Device %d not available\n", dev);
 347                 return 1;
 348         }
 349         if (stor_dev->block_read==NULL) {
 350                 printf("storage device not initialized. Use usb scan\n");
 351                 return 1;
 352         }
 353         if (*ep) {
 354                 if (*ep != ':') {
 355                         puts ("\n** Invalid boot device, use `dev[:part]' **\n");
 356                         return 1;
 357                 }
 358                 part = simple_strtoul(++ep, NULL, 16);
 359         }
 360
 361         if (get_partition_info (stor_dev, part, &info)) {
 362                 /* try to boot raw .... */
 363                 strncpy((char *)&info.type[0], BOOT_PART_TYPE, sizeof(BOOT_PART_TYPE));
 364                 strncpy((char *)&info.name[0], "Raw", 4);
 365                 info.start=0;
 366                 info.blksz=0x200;
 367                 info.size=2880;
 368                 printf("error reading partinfo...try to boot raw\n");
 369         }
 370         if ((strncmp((char *)info.type, BOOT_PART_TYPE, sizeof(info.type)) != 0) &&
 371             (strncmp((char *)info.type, BOOT_PART_COMP, sizeof(info.type)) != 0)) {
 372                 printf ("\n** Invalid partition type \"%.32s\""
 373                         " (expect \"" BOOT_PART_TYPE "\")\n",
 374                         info.type);
 375                 return 1;
 376         }
 377         printf ("\nLoading from USB device %d, partition %d: "
 378                 "Name: %.32s  Type: %.32s\n",
 379                 dev, part, info.name, info.type);
 380
 381         debug ("First Block: %ld,  # of blocks: %ld, Block Size: %ld\n",
 382                 info.start, info.size, info.blksz);
 383
 384         if (stor_dev->block_read(dev, info.start, 1, (ulong *)addr) != 1) {
 385                 printf ("** Read error on %d:%d\n", dev, part);
 386                 return 1;
 387         }
 388
 389         hdr = (image_header_t *)addr;
 390
 391         if (!image_get_magic (hdr)) {
 392                 printf("\n** Bad Magic Number **\n");
 393                 return 1;
 394         }
 395
 396         if (!image_check_hcrc (hdr)) {
 397                 puts ("\n** Bad Header Checksum **\n");
 398                 return 1;
 399         }
 400
 401         image_print_contents (hdr);
 402
 403         cnt = image_get_image_size (hdr);
 404         cnt += info.blksz - 1;
 405         cnt /= info.blksz;
 406         cnt -= 1;
 407
 408         if (stor_dev->block_read (dev, info.start+1, cnt,
 409                       (ulong *)(addr+info.blksz)) != cnt) {
 410                 printf ("\n** Read error on %d:%d\n", dev, part);
 411                 return 1;
 412         }
 413         /* Loading ok, update default load address */
 414         load_addr = addr;
 415
 416         flush_cache (addr, (cnt+1)*info.blksz);
 417
 418         /* Check if we should attempt an auto-start */
 419         if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 420                 char *local_args[2];
 421                 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
 422                 local_args[0] = argv[0];
 423                 local_args[1] = NULL;
 424                 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
 425                 rcode=do_bootm (cmdtp, 0, 1, local_args);
 426                 return rcode;
 427         }
 428         return 0;
 429 }
 430 #endif /* CONFIG_USB_STORAGE */
 431
 432
 433 /*********************************************************************************
 434  * usb command intepreter
 435  */
 436 int do_usb (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 437 {
 438
 439         int i;
 440         struct usb_device *dev = NULL;
 441         extern char usb_started;
 442 #ifdef CONFIG_USB_STORAGE
 443         block_dev_desc_t *stor_dev;
 444 #endif
 445
 446         if ((strncmp(argv[1], "reset", 5) == 0) ||
 447                  (strncmp(argv[1], "start", 5) == 0)){
 448                 usb_stop();
 449                 printf("(Re)start USB...\n");
 450                 i = usb_init();
 451 #ifdef CONFIG_USB_STORAGE
 452                 /* try to recognize storage devices immediately */
 453                 if (i >= 0)
 454                         usb_stor_curr_dev = usb_stor_scan(1);
 455 #endif
 456                 return 0;
 457         }
 458         if (strncmp(argv[1],"stop",4) == 0) {
 459 #ifdef CONFIG_USB_KEYBOARD
 460                 if (argc==2) {
 461                         if (usb_kbd_deregister()!=0) {
 462                                 printf("USB not stopped: usbkbd still using USB\n");
 463                                 return 1;
 464                         }
 465                 }
 466                 else { /* forced stop, switch console in to serial */
 467                         console_assign(stdin,"serial");
 468                         usb_kbd_deregister();
 469                 }
 470 #endif
 471                 printf("stopping USB..\n");
 472                 usb_stop();
 473                 return 0;
 474         }
 475         if (!usb_started) {
 476                 printf("USB is stopped. Please issue 'usb start' first.\n");
 477                 return 1;
 478         }
 479         if (strncmp(argv[1],"tree",4) == 0) {
 480                 printf("\nDevice Tree:\n");
 481                 usb_show_tree(usb_get_dev_index(0));
 482                 return 0;
 483         }
 484         if (strncmp(argv[1],"inf",3) == 0) {
 485                 int d;
 486                 if (argc==2) {
 487                         for(d=0;d<USB_MAX_DEVICE;d++) {
 488                                 dev=usb_get_dev_index(d);
 489                                 if (dev==NULL)
 490                                         break;
 491                                 usb_display_desc(dev);
 492                                 usb_display_config(dev);
 493                         }
 494                         return 0;
 495                 }
 496                 else {
 497                         int d;
 498
 499                         i=simple_strtoul(argv[2], NULL, 16);
 500                         printf("config for device %d\n",i);
 501                         for(d=0;d<USB_MAX_DEVICE;d++) {
 502                                 dev=usb_get_dev_index(d);
 503                                 if (dev==NULL)
 504                                         break;
 505                                 if (dev->devnum==i)
 506                                         break;
 507                         }
 508                         if (dev==NULL) {
 509                                 printf("*** NO Device avaiable ***\n");
 510                                 return 0;
 511                         }
 512                         else {
 513                                 usb_display_desc(dev);
 514                                 usb_display_config(dev);
 515                         }
 516                 }
 517                 return 0;
 518         }
 519 #ifdef CONFIG_USB_STORAGE
 520         if (strncmp(argv[1], "scan", 4) == 0) {
 521                 printf("  NOTE: this command is obsolete and will be phased out\n");
 522                 printf("  please use 'usb storage' for USB storage devices information\n\n");
 523                 usb_stor_info();
 524                 return 0;
 525         }
 526
 527         if (strncmp(argv[1], "stor", 4) == 0) {
 528                 usb_stor_info();
 529                 return 0;
 530         }
 531
 532         if (strncmp(argv[1],"part",4) == 0) {
 533                 int devno, ok;
 534                 for (ok=0, devno=0; devno<USB_MAX_STOR_DEV; ++devno) {
 535                         stor_dev=usb_stor_get_dev(devno);
 536                         if (stor_dev->type!=DEV_TYPE_UNKNOWN) {
 537                                 ok++;
 538                                 if (devno)
 539                                         printf("\n");
 540                                 printf("print_part of %x\n",devno);
 541                                 print_part(stor_dev);
 542                         }
 543                 }
 544                 if (!ok) {
 545                         printf("\nno USB devices available\n");
 546                         return 1;
 547                 }
 548                 return 0;
 549         }
 550         if (strcmp(argv[1],"read") == 0) {
 551                 if (usb_stor_curr_dev<0) {
 552                         printf("no current device selected\n");
 553                         return 1;
 554                 }
 555                 if (argc==5) {
 556                         unsigned long addr = simple_strtoul(argv[2], NULL, 16);
 557                         unsigned long blk  = simple_strtoul(argv[3], NULL, 16);
 558                         unsigned long cnt  = simple_strtoul(argv[4], NULL, 16);
 559                         unsigned long n;
 560                         printf ("\nUSB read: device %d block # %ld, count %ld ... ",
 561                                         usb_stor_curr_dev, blk, cnt);
 562                         stor_dev=usb_stor_get_dev(usb_stor_curr_dev);
 563                         n = stor_dev->block_read(usb_stor_curr_dev, blk, cnt, (ulong *)addr);
 564                         printf ("%ld blocks read: %s\n",n,(n==cnt) ? "OK" : "ERROR");
 565                         if (n==cnt)
 566                                 return 0;
 567                         return 1;
 568                 }
 569         }
 570         if (strncmp(argv[1], "dev", 3) == 0) {
 571                 if (argc == 3) {
 572                         int dev = (int)simple_strtoul(argv[2], NULL, 10);
 573                         printf ("\nUSB device %d: ", dev);
 574                         if (dev >= USB_MAX_STOR_DEV) {
 575                                 printf("unknown device\n");
 576                                 return 1;
 577                         }
 578                         printf ("\n    Device %d: ", dev);
 579                         stor_dev=usb_stor_get_dev(dev);
 580                         dev_print(stor_dev);
 581                         if (stor_dev->type == DEV_TYPE_UNKNOWN) {
 582                                 return 1;
 583                         }
 584                         usb_stor_curr_dev = dev;
 585                         printf("... is now current device\n");
 586                         return 0;
 587                 }
 588                 else {
 589                         printf ("\nUSB device %d: ", usb_stor_curr_dev);
 590                         stor_dev=usb_stor_get_dev(usb_stor_curr_dev);
 591                         dev_print(stor_dev);
 592                         if (stor_dev->type == DEV_TYPE_UNKNOWN) {
 593                                 return 1;
 594                         }
 595                         return 0;
 596                 }
 597                 return 0;
 598         }
 599 #endif /* CONFIG_USB_STORAGE */
 600         printf ("Usage:\n%s\n", cmdtp->usage);
 601         return 1;
 602 }
 603
 604 #ifdef CONFIG_USB_STORAGE
 605 U_BOOT_CMD(
 606         usb,    5,      1,      do_usb,
 607         "usb     - USB sub-system\n",
 608         "reset - reset (rescan) USB controller\n"
 609         "usb stop [f]  - stop USB [f]=force stop\n"
 610         "usb tree  - show USB device tree\n"
 611         "usb info [dev] - show available USB devices\n"
 612         "usb storage  - show details of USB storage devices\n"
 613         "usb dev [dev] - show or set current USB storage device\n"
 614         "usb part [dev] - print partition table of one or all USB storage devices\n"
 615         "usb read addr blk# cnt - read `cnt' blocks starting at block `blk#'\n"
 616         "    to memory address `addr'\n"
 617 );
 618
 619
 620 U_BOOT_CMD(
 621         usbboot,        3,      1,      do_usbboot,
 622         "usbboot - boot from USB device\n",
 623         "loadAddr dev:part\n"
 624 );
 625
 626 #else
 627 U_BOOT_CMD(
 628         usb,    5,      1,      do_usb,
 629         "usb     - USB sub-system\n",
 630         "reset - reset (rescan) USB controller\n"
 631         "usb  tree  - show USB device tree\n"
 632         "usb  info [dev] - show available USB devices\n"
 633 );
 634 #endif