common/usb.c

   1 /*
   2  *
   3  * Most of this source has been derived from the Linux USB
   4  * project:
   5  * (C) Copyright Linus Torvalds 1999
   6  * (C) Copyright Johannes Erdfelt 1999-2001
   7  * (C) Copyright Andreas Gal 1999
   8  * (C) Copyright Gregory P. Smith 1999
   9  * (C) Copyright Deti Fliegl 1999 (new USB architecture)
  10  * (C) Copyright Randy Dunlap 2000
  11  * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
  12  * (C) Copyright Yggdrasil Computing, Inc. 2000
  13  *     (usb_device_id matching changes by Adam J. Richter)
  14  *
  15  * Adapted for U-Boot:
  16  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
  17  *
  18  * See file CREDITS for list of people who contributed to this
  19  * project.
  20  *
  21  * This program is free software; you can redistribute it and/or
  22  * modify it under the terms of the GNU General Public License as
  23  * published by the Free Software Foundation; either version 2 of
  24  * the License, or (at your option) any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  34  * MA 02111-1307 USA
  35  *
  36  */
  37
  38 /*
  39  * How it works:
  40  *
  41  * Since this is a bootloader, the devices will not be automatic
  42  * (re)configured on hotplug, but after a restart of the USB the
  43  * device should work.
  44  *
  45  * For each transfer (except "Interrupt") we wait for completion.
  46  */
  47 #include <common.h>
  48 #include <command.h>
  49 #include <asm/processor.h>
  50 #include <linux/ctype.h>
  51
  52 #if defined(CONFIG_CMD_USB)
  53
  54 #include <usb.h>
  55 #ifdef CONFIG_4xx
  56 #include <asm/4xx_pci.h>
  57 #endif
  58
  59 #undef USB_DEBUG
  60
  61 #ifdef  USB_DEBUG
  62 #define USB_PRINTF(fmt,args...) printf (fmt ,##args)
  63 #else
  64 #define USB_PRINTF(fmt,args...)
  65 #endif
  66
  67 #define USB_BUFSIZ      512
  68
  69 static struct usb_device usb_dev[USB_MAX_DEVICE];
  70 static int dev_index;
  71 static int running;
  72 static int asynch_allowed;
  73 static struct devrequest setup_packet;
  74
  75 char usb_started; /* flag for the started/stopped USB status */
  76
  77 /**********************************************************************
  78  * some forward declerations...
  79  */
  80 void usb_scan_devices(void);
  81
  82 int usb_hub_probe(struct usb_device *dev, int ifnum);
  83 void usb_hub_reset(void);
  84
  85
  86 /***********************************************************************
  87  * wait_ms
  88  */
  89
  90 void __inline__ wait_ms(unsigned long ms)
  91 {
  92         while(ms-->0)
  93                 udelay(1000);
  94 }
  95 /***************************************************************************
  96  * Init USB Device
  97  */
  98
  99 int usb_init(void)
 100 {
 101         int result;
 102
 103         running=0;
 104         dev_index=0;
 105         asynch_allowed=1;
 106         usb_hub_reset();
 107         /* init low_level USB */
 108         printf("USB:   ");
 109         result = usb_lowlevel_init();
 110         /* if lowlevel init is OK, scan the bus for devices i.e. search HUBs and configure them */
 111         if(result==0) {
 112                 printf("scanning bus for devices... ");
 113                 running=1;
 114                 usb_scan_devices();
 115                 usb_started = 1;
 116                 return 0;
 117         }
 118         else {
 119                 printf("Error, couldn't init Lowlevel part\n");
 120                 usb_started = 0;
 121                 return -1;
 122         }
 123 }
 124
 125 /******************************************************************************
 126  * Stop USB this stops the LowLevel Part and deregisters USB devices.
 127  */
 128 int usb_stop(void)
 129 {
 130         asynch_allowed=1;
 131         usb_started = 0;
 132         usb_hub_reset();
 133         return usb_lowlevel_stop();
 134 }
 135
 136 /*
 137  * disables the asynch behaviour of the control message. This is used for data
 138  * transfers that uses the exclusiv access to the control and bulk messages.
 139  */
 140 void usb_disable_asynch(int disable)
 141 {
 142         asynch_allowed=!disable;
 143 }
 144
 145
 146 /*-------------------------------------------------------------------
 147  * Message wrappers.
 148  *
 149  */
 150
 151 /*
 152  * submits an Interrupt Message
 153  */
 154 int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
 155                         void *buffer,int transfer_len, int interval)
 156 {
 157         return submit_int_msg(dev,pipe,buffer,transfer_len,interval);
 158 }
 159
 160 /*
 161  * submits a control message and waits for comletion (at least timeout * 1ms)
 162  * If timeout is 0, we don't wait for completion (used as example to set and
 163  * clear keyboards LEDs). For data transfers, (storage transfers) we don't
 164  * allow control messages with 0 timeout, by previousely resetting the flag
 165  * asynch_allowed (usb_disable_asynch(1)).
 166  * returns the transfered length if OK or -1 if error. The transfered length
 167  * and the current status are stored in the dev->act_len and dev->status.
 168  */
 169 int usb_control_msg(struct usb_device *dev, unsigned int pipe,
 170                         unsigned char request, unsigned char requesttype,
 171                         unsigned short value, unsigned short index,
 172                         void *data, unsigned short size, int timeout)
 173 {
 174         if((timeout==0)&&(!asynch_allowed)) /* request for a asynch control pipe is not allowed */
 175                 return -1;
 176
 177         /* set setup command */
 178         setup_packet.requesttype = requesttype;
 179         setup_packet.request = request;
 180         setup_packet.value = swap_16(value);
 181         setup_packet.index = swap_16(index);
 182         setup_packet.length = swap_16(size);
 183         USB_PRINTF("usb_control_msg: request: 0x%X, requesttype: 0x%X\nvalue 0x%X index 0x%X length 0x%X\n",
 184                 request,requesttype,value,index,size);
 185         dev->status=USB_ST_NOT_PROC; /*not yet processed */
 186
 187         submit_control_msg(dev,pipe,data,size,&setup_packet);
 188         if(timeout==0) {
 189                 return (int)size;
 190         }
 191         while(timeout--) {
 192                 if(!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 193                         break;
 194                 wait_ms(1);
 195         }
 196         if(dev->status==0)
 197                 return dev->act_len;
 198         else {
 199                 return -1;
 200         }
 201 }
 202
 203 /*-------------------------------------------------------------------
 204  * submits bulk message, and waits for completion. returns 0 if Ok or
 205  * -1 if Error.
 206  * synchronous behavior
 207  */
 208 int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
 209                         void *data, int len, int *actual_length, int timeout)
 210 {
 211         if (len < 0)
 212                 return -1;
 213         dev->status=USB_ST_NOT_PROC; /*not yet processed */
 214         submit_bulk_msg(dev,pipe,data,len);
 215         while(timeout--) {
 216                 if(!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 217                         break;
 218                 wait_ms(1);
 219         }
 220         *actual_length=dev->act_len;
 221         if(dev->status==0)
 222                 return 0;
 223         else
 224                 return -1;
 225 }
 226
 227
 228 /*-------------------------------------------------------------------
 229  * Max Packet stuff
 230  */
 231
 232 /*
 233  * returns the max packet size, depending on the pipe direction and
 234  * the configurations values
 235  */
 236 int usb_maxpacket(struct usb_device *dev,unsigned long pipe)
 237 {
 238         if((pipe & USB_DIR_IN)==0) /* direction is out -> use emaxpacket out */
 239                 return(dev->epmaxpacketout[((pipe>>15) & 0xf)]);
 240         else
 241                 return(dev->epmaxpacketin[((pipe>>15) & 0xf)]);
 242 }
 243
 244 /*
 245  * set the max packed value of all endpoints in the given configuration
 246  */
 247 int usb_set_maxpacket(struct usb_device *dev)
 248 {
 249         int i,ii,b;
 250         struct usb_endpoint_descriptor *ep;
 251
 252         for(i=0; i<dev->config.bNumInterfaces;i++) {
 253                 for(ii=0; ii<dev->config.if_desc[i].bNumEndpoints; ii++) {
 254                         ep=&dev->config.if_desc[i].ep_desc[ii];
 255                         b=ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 256
 257                         if((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)==USB_ENDPOINT_XFER_CONTROL) {        /* Control => bidirectional */
 258                                 dev->epmaxpacketout[b] = ep->wMaxPacketSize;
 259                                 dev->epmaxpacketin [b] = ep->wMaxPacketSize;
 260                                 USB_PRINTF("##Control EP epmaxpacketout/in[%d] = %d\n",b,dev->epmaxpacketin[b]);
 261                         }
 262                         else {
 263                                 if ((ep->bEndpointAddress & 0x80)==0) { /* OUT Endpoint */
 264                                         if(ep->wMaxPacketSize > dev->epmaxpacketout[b]) {
 265                                                 dev->epmaxpacketout[b] = ep->wMaxPacketSize;
 266                                                 USB_PRINTF("##EP epmaxpacketout[%d] = %d\n",b,dev->epmaxpacketout[b]);
 267                                         }
 268                                 }
 269                                 else  { /* IN Endpoint */
 270                                         if(ep->wMaxPacketSize > dev->epmaxpacketin[b]) {
 271                                                 dev->epmaxpacketin[b] = ep->wMaxPacketSize;
 272                                                 USB_PRINTF("##EP epmaxpacketin[%d] = %d\n",b,dev->epmaxpacketin[b]);
 273                                         }
 274                                 } /* if out */
 275                         } /* if control */
 276                 } /* for each endpoint */
 277         }
 278         return 0;
 279 }
 280
 281 /*******************************************************************************
 282  * Parse the config, located in buffer, and fills the dev->config structure.
 283  * Note that all little/big endian swapping are done automatically.
 284  */
 285 int usb_parse_config(struct usb_device *dev, unsigned char *buffer, int cfgno)
 286 {
 287         struct usb_descriptor_header *head;
 288         int index, ifno, epno, curr_if_num;
 289         int i;
 290         unsigned char *ch;
 291
 292         ifno = -1;
 293         epno = -1;
 294         curr_if_num = -1;
 295
 296         dev->configno = cfgno;
 297         head = (struct usb_descriptor_header *) &buffer[0];
 298         if(head->bDescriptorType != USB_DT_CONFIG) {
 299                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n", head->bDescriptorType);
 300                 return -1;
 301         }
 302         memcpy(&dev->config, buffer, buffer[0]);
 303         dev->config.wTotalLength = swap_16(dev->config.wTotalLength);
 304         dev->config.no_of_if = 0;
 305
 306         index = dev->config.bLength;
 307         /* Ok the first entry must be a configuration entry, now process the others */
 308         head = (struct usb_descriptor_header *) &buffer[index];
 309         while(index + 1 < dev->config.wTotalLength) {
 310                 switch(head->bDescriptorType) {
 311                         case USB_DT_INTERFACE:
 312                                 if(((struct usb_interface_descriptor *) &buffer[index])->
 313                                         bInterfaceNumber != curr_if_num) {
 314                                         /* this is a new interface, copy new desc */
 315                                         ifno = dev->config.no_of_if;
 316                                         dev->config.no_of_if++;
 317                                         memcpy(&dev->config.if_desc[ifno],
 318                                                 &buffer[index], buffer[index]);
 319                                         dev->config.if_desc[ifno].no_of_ep = 0;
 320                                         dev->config.if_desc[ifno].num_altsetting = 1;
 321                                         curr_if_num = dev->config.if_desc[ifno].bInterfaceNumber;
 322                                 } else {
 323                                         /* found alternate setting for the interface */
 324                                         dev->config.if_desc[ifno].num_altsetting++;
 325                                 }
 326                                 break;
 327                         case USB_DT_ENDPOINT:
 328                                 epno = dev->config.if_desc[ifno].no_of_ep;
 329                                 dev->config.if_desc[ifno].no_of_ep++; /* found an endpoint */
 330                                 memcpy(&dev->config.if_desc[ifno].ep_desc[epno],
 331                                         &buffer[index], buffer[index]);
 332                                 dev->config.if_desc[ifno].ep_desc[epno].wMaxPacketSize =
 333                                         swap_16(dev->config.if_desc[ifno].ep_desc[epno].wMaxPacketSize);
 334                                 USB_PRINTF("if %d, ep %d\n", ifno, epno);
 335                                 break;
 336                         default:
 337                                 if(head->bLength == 0)
 338                                         return 1;
 339                                 USB_PRINTF("unknown Description Type : %x\n", head->bDescriptorType);
 340                                 {
 341                                         ch = (unsigned char *)head;
 342                                         for(i = 0; i < head->bLength; i++)
 343                                                 USB_PRINTF("%02X ", *ch++);
 344                                         USB_PRINTF("\n\n\n");
 345                                 }
 346                                 break;
 347                 }
 348                 index += head->bLength;
 349                 head = (struct usb_descriptor_header *)&buffer[index];
 350         }
 351         return 1;
 352 }
 353
 354 /***********************************************************************
 355  * Clears an endpoint
 356  * endp: endpoint number in bits 0-3;
 357  * direction flag in bit 7 (1 = IN, 0 = OUT)
 358  */
 359 int usb_clear_halt(struct usb_device *dev, int pipe)
 360 {
 361         int result;
 362         int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
 363
 364         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 365                 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0, endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
 366
 367         /* don't clear if failed */
 368         if (result < 0)
 369                 return result;
 370
 371         /*
 372          * NOTE: we do not get status and verify reset was successful
 373          * as some devices are reported to lock up upon this check..
 374          */
 375
 376         usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
 377
 378         /* toggle is reset on clear */
 379         usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
 380         return 0;
 381 }
 382
 383
 384 /**********************************************************************
 385  * get_descriptor type
 386  */
 387 int usb_get_descriptor(struct usb_device *dev, unsigned char type, unsigned char index, void *buf, int size)
 388 {
 389         int res;
 390         res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 391                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 392                         (type << 8) + index, 0,
 393                         buf, size, USB_CNTL_TIMEOUT);
 394         return res;
 395 }
 396
 397 /**********************************************************************
 398  * gets configuration cfgno and store it in the buffer
 399  */
 400 int usb_get_configuration_no(struct usb_device *dev,unsigned char *buffer,int cfgno)
 401 {
 402         int result;
 403         unsigned int tmp;
 404         struct usb_config_descriptor *config;
 405
 406
 407         config=(struct usb_config_descriptor *)&buffer[0];
 408         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 8);
 409         if (result < 8) {
 410                 if (result < 0)
 411                         printf("unable to get descriptor, error %lX\n",dev->status);
 412                 else
 413                         printf("config descriptor too short (expected %i, got %i)\n",8,result);
 414                 return -1;
 415         }
 416         tmp=swap_16(config->wTotalLength);
 417
 418         if (tmp > USB_BUFSIZ) {
 419                 USB_PRINTF("usb_get_configuration_no: failed to get descriptor - too long: %d\n",
 420                         tmp);
 421                 return -1;
 422         }
 423
 424         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
 425         USB_PRINTF("get_conf_no %d Result %d, wLength %d\n",cfgno,result,tmp);
 426         return result;
 427 }
 428
 429 /********************************************************************
 430  * set address of a device to the value in dev->devnum.
 431  * This can only be done by addressing the device via the default address (0)
 432  */
 433 int usb_set_address(struct usb_device *dev)
 434 {
 435         int res;
 436
 437         USB_PRINTF("set address %d\n",dev->devnum);
 438         res=usb_control_msg(dev, usb_snddefctrl(dev),
 439                 USB_REQ_SET_ADDRESS, 0,
 440                 (dev->devnum),0,
 441                 NULL,0, USB_CNTL_TIMEOUT);
 442         return res;
 443 }
 444
 445 /********************************************************************
 446  * set interface number to interface
 447  */
 448 int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 449 {
 450         struct usb_interface_descriptor *if_face = NULL;
 451         int ret, i;
 452
 453         for (i = 0; i < dev->config.bNumInterfaces; i++) {
 454                 if (dev->config.if_desc[i].bInterfaceNumber == interface) {
 455                         if_face = &dev->config.if_desc[i];
 456                         break;
 457                 }
 458         }
 459         if (!if_face) {
 460                 printf("selecting invalid interface %d", interface);
 461                 return -1;
 462         }
 463         /*
 464          * We should return now for devices with only one alternate setting.
 465          * According to 9.4.10 of the Universal Serial Bus Specification Revision 2.0
 466          * such devices can return with a STALL. This results in some USB sticks
 467          * timeouting during initialization and then being unusable in U-Boot.
 468          */
 469         if (if_face->num_altsetting == 1)
 470                 return 0;
 471
 472         if ((ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 473             USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, alternate,
 474             interface, NULL, 0, USB_CNTL_TIMEOUT * 5)) < 0)
 475                 return ret;
 476
 477         return 0;
 478 }
 479
 480 /********************************************************************
 481  * set configuration number to configuration
 482  */
 483 int usb_set_configuration(struct usb_device *dev, int configuration)
 484 {
 485         int res;
 486         USB_PRINTF("set configuration %d\n",configuration);
 487         /* set setup command */
 488         res=usb_control_msg(dev, usb_sndctrlpipe(dev,0),
 489                 USB_REQ_SET_CONFIGURATION, 0,
 490                 configuration,0,
 491                 NULL,0, USB_CNTL_TIMEOUT);
 492         if(res==0) {
 493                 dev->toggle[0] = 0;
 494                 dev->toggle[1] = 0;
 495                 return 0;
 496         }
 497         else
 498                 return -1;
 499 }
 500
 501 /********************************************************************
 502  * set protocol to protocol
 503  */
 504 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
 505 {
 506         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 507                 USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 508                 protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 509 }
 510
 511 /********************************************************************
 512  * set idle
 513  */
 514 int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
 515 {
 516         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 517                 USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 518                 (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 519 }
 520
 521 /********************************************************************
 522  * get report
 523  */
 524 int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type, unsigned char id, void *buf, int size)
 525 {
 526         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 527                 USB_REQ_GET_REPORT, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 528                 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 529 }
 530
 531 /********************************************************************
 532  * get class descriptor
 533  */
 534 int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
 535                 unsigned char type, unsigned char id, void *buf, int size)
 536 {
 537         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 538                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 539                 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 540 }
 541
 542 /********************************************************************
 543  * get string index in buffer
 544  */
 545 int usb_get_string(struct usb_device *dev, unsigned short langid, unsigned char index, void *buf, int size)
 546 {
 547         int i;
 548         int result;
 549
 550         for (i = 0; i < 3; ++i) {
 551                 /* some devices are flaky */
 552                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 553                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 554                         (USB_DT_STRING << 8) + index, langid, buf, size,
 555                         USB_CNTL_TIMEOUT);
 556
 557                 if (result > 0)
 558                         break;
 559         }
 560
 561         return result;
 562 }
 563
 564
 565 static void usb_try_string_workarounds(unsigned char *buf, int *length)
 566 {
 567         int newlength, oldlength = *length;
 568
 569         for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
 570                 if (!isprint(buf[newlength]) || buf[newlength + 1])
 571                         break;
 572
 573         if (newlength > 2) {
 574                 buf[0] = newlength;
 575                 *length = newlength;
 576         }
 577 }
 578
 579
 580 static int usb_string_sub(struct usb_device *dev, unsigned int langid,
 581                 unsigned int index, unsigned char *buf)
 582 {
 583         int rc;
 584
 585         /* Try to read the string descriptor by asking for the maximum
 586          * possible number of bytes */
 587         rc = usb_get_string(dev, langid, index, buf, 255);
 588
 589         /* If that failed try to read the descriptor length, then
 590          * ask for just that many bytes */
 591         if (rc < 2) {
 592                 rc = usb_get_string(dev, langid, index, buf, 2);
 593                 if (rc == 2)
 594                         rc = usb_get_string(dev, langid, index, buf, buf[0]);
 595         }
 596
 597         if (rc >= 2) {
 598                 if (!buf[0] && !buf[1])
 599                         usb_try_string_workarounds(buf, &rc);
 600
 601                 /* There might be extra junk at the end of the descriptor */
 602                 if (buf[0] < rc)
 603                         rc = buf[0];
 604
 605                 rc = rc - (rc & 1); /* force a multiple of two */
 606         }
 607
 608         if (rc < 2)
 609                 rc = -1;
 610
 611         return rc;
 612 }
 613
 614
 615 /********************************************************************
 616  * usb_string:
 617  * Get string index and translate it to ascii.
 618  * returns string length (> 0) or error (< 0)
 619  */
 620 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 621 {
 622         unsigned char mybuf[USB_BUFSIZ];
 623         unsigned char *tbuf;
 624         int err;
 625         unsigned int u, idx;
 626
 627         if (size <= 0 || !buf || !index)
 628                 return -1;
 629         buf[0] = 0;
 630         tbuf=&mybuf[0];
 631
 632         /* get langid for strings if it's not yet known */
 633         if (!dev->have_langid) {
 634                 err = usb_string_sub(dev, 0, 0, tbuf);
 635                 if (err < 0) {
 636                         USB_PRINTF("error getting string descriptor 0 (error=%x)\n",dev->status);
 637                         return -1;
 638                 } else if (tbuf[0] < 4) {
 639                         USB_PRINTF("string descriptor 0 too short\n");
 640                         return -1;
 641                 } else {
 642                         dev->have_langid = -1;
 643                         dev->string_langid = tbuf[2] | (tbuf[3]<< 8);
 644                                 /* always use the first langid listed */
 645                         USB_PRINTF("USB device number %d default language ID 0x%x\n",
 646                                 dev->devnum, dev->string_langid);
 647                 }
 648         }
 649
 650         err = usb_string_sub(dev, dev->string_langid, index, tbuf);
 651         if (err < 0)
 652                 return err;
 653
 654         size--;         /* leave room for trailing NULL char in output buffer */
 655         for (idx = 0, u = 2; u < err; u += 2) {
 656                 if (idx >= size)
 657                         break;
 658                 if (tbuf[u+1])                  /* high byte */
 659                         buf[idx++] = '?';  /* non-ASCII character */
 660                 else
 661                         buf[idx++] = tbuf[u];
 662         }
 663         buf[idx] = 0;
 664         err = idx;
 665         return err;
 666 }
 667
 668
 669 /********************************************************************
 670  * USB device handling:
 671  * the USB device are static allocated [USB_MAX_DEVICE].
 672  */
 673
 674
 675 /* returns a pointer to the device with the index [index].
 676  * if the device is not assigned (dev->devnum==-1) returns NULL
 677  */
 678 struct usb_device * usb_get_dev_index(int index)
 679 {
 680         if(usb_dev[index].devnum==-1)
 681                 return NULL;
 682         else
 683                 return &usb_dev[index];
 684 }
 685
 686
 687 /* returns a pointer of a new device structure or NULL, if
 688  * no device struct is available
 689  */
 690 struct usb_device * usb_alloc_new_device(void)
 691 {
 692         int i;
 693         USB_PRINTF("New Device %d\n",dev_index);
 694         if(dev_index==USB_MAX_DEVICE) {
 695                 printf("ERROR, too many USB Devices, max=%d\n",USB_MAX_DEVICE);
 696                 return NULL;
 697         }
 698         usb_dev[dev_index].devnum=dev_index+1; /* default Address is 0, real addresses start with 1 */
 699         usb_dev[dev_index].maxchild=0;
 700         for(i=0;i<USB_MAXCHILDREN;i++)
 701                 usb_dev[dev_index].children[i]=NULL;
 702         usb_dev[dev_index].parent=NULL;
 703         dev_index++;
 704         return &usb_dev[dev_index-1];
 705 }
 706
 707
 708 /*
 709  * By the time we get here, the device has gotten a new device ID
 710  * and is in the default state. We need to identify the thing and
 711  * get the ball rolling..
 712  *
 713  * Returns 0 for success, != 0 for error.
 714  */
 715 int usb_new_device(struct usb_device *dev)
 716 {
 717         int addr, err;
 718         int tmp;
 719         unsigned char tmpbuf[USB_BUFSIZ];
 720
 721         dev->descriptor.bMaxPacketSize0 = 8;  /* Start off at 8 bytes  */
 722         dev->maxpacketsize = 0;         /* Default to 8 byte max packet size */
 723         dev->epmaxpacketin [0] = 8;
 724         dev->epmaxpacketout[0] = 8;
 725
 726         /* We still haven't set the Address yet */
 727         addr = dev->devnum;
 728         dev->devnum = 0;
 729
 730 #undef NEW_INIT_SEQ
 731 #ifdef NEW_INIT_SEQ
 732         /* this is a Windows scheme of initialization sequence, with double
 733          * reset of the device. Some equipment is said to work only with such
 734          * init sequence; this patch is based on the work by Alan Stern:
 735          * http://sourceforge.net/mailarchive/forum.php?thread_id=5729457&forum_id=5398
 736          */
 737         int j;
 738         struct usb_device_descriptor *desc;
 739         int port = -1;
 740         struct usb_device *parent = dev->parent;
 741         unsigned short portstatus;
 742
 743         /* send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
 744          * only 18 bytes long, this will terminate with a short packet.  But if
 745          * the maxpacket size is 8 or 16 the device may be waiting to transmit
 746          * some more. */
 747
 748         desc = (struct usb_device_descriptor *)tmpbuf;
 749         desc->bMaxPacketSize0 = 0;
 750         for (j = 0; j < 3; ++j) {
 751                 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
 752                 if (err < 0) {
 753                         USB_PRINTF("usb_new_device: 64 byte descr\n");
 754                         break;
 755                 }
 756         }
 757         dev->descriptor.bMaxPacketSize0 = desc->bMaxPacketSize0;
 758
 759         /* find the port number we're at */
 760         if (parent) {
 761
 762                 for (j = 0; j < parent->maxchild; j++) {
 763                         if (parent->children[j] == dev) {
 764                                 port = j;
 765                                 break;
 766                         }
 767                 }
 768                 if (port < 0) {
 769                         printf("usb_new_device: cannot locate device's port..\n");
 770                         return 1;
 771                 }
 772
 773                 /* reset the port for the second time */
 774                 err = hub_port_reset(dev->parent, port, &portstatus);
 775                 if (err < 0) {
 776                         printf("\n     Couldn't reset port %i\n", port);
 777                         return 1;
 778                 }
 779         }
 780 #else
 781         /* and this is the old and known way of initializing devices */
 782         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, 8);
 783         if (err < 8) {
 784                 printf("\n      USB device not responding, giving up (status=%lX)\n",dev->status);
 785                 return 1;
 786         }
 787 #endif
 788
 789         dev->epmaxpacketin [0] = dev->descriptor.bMaxPacketSize0;
 790         dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
 791         switch (dev->descriptor.bMaxPacketSize0) {
 792                 case 8: dev->maxpacketsize = 0; break;
 793                 case 16: dev->maxpacketsize = 1; break;
 794                 case 32: dev->maxpacketsize = 2; break;
 795                 case 64: dev->maxpacketsize = 3; break;
 796         }
 797         dev->devnum = addr;
 798
 799         err = usb_set_address(dev); /* set address */
 800
 801         if (err < 0) {
 802                 printf("\n      USB device not accepting new address (error=%lX)\n", dev->status);
 803                 return 1;
 804         }
 805
 806         wait_ms(10);    /* Let the SET_ADDRESS settle */
 807
 808         tmp = sizeof(dev->descriptor);
 809
 810         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, sizeof(dev->descriptor));
 811         if (err < tmp) {
 812                 if (err < 0)
 813                         printf("unable to get device descriptor (error=%d)\n",err);
 814                 else
 815                         printf("USB device descriptor short read (expected %i, got %i)\n",tmp,err);
 816                 return 1;
 817         }
 818         /* correct le values */
 819         dev->descriptor.bcdUSB=swap_16(dev->descriptor.bcdUSB);
 820         dev->descriptor.idVendor=swap_16(dev->descriptor.idVendor);
 821         dev->descriptor.idProduct=swap_16(dev->descriptor.idProduct);
 822         dev->descriptor.bcdDevice=swap_16(dev->descriptor.bcdDevice);
 823         /* only support for one config for now */
 824         usb_get_configuration_no(dev,&tmpbuf[0],0);
 825         usb_parse_config(dev,&tmpbuf[0],0);
 826         usb_set_maxpacket(dev);
 827         /* we set the default configuration here */
 828         if (usb_set_configuration(dev, dev->config.bConfigurationValue)) {
 829                 printf("failed to set default configuration len %d, status %lX\n",dev->act_len,dev->status);
 830                 return -1;
 831         }
 832         USB_PRINTF("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
 833                 dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber);
 834         memset(dev->mf, 0, sizeof(dev->mf));
 835         memset(dev->prod, 0, sizeof(dev->prod));
 836         memset(dev->serial, 0, sizeof(dev->serial));
 837         if (dev->descriptor.iManufacturer)
 838                 usb_string(dev, dev->descriptor.iManufacturer, dev->mf, sizeof(dev->mf));
 839         if (dev->descriptor.iProduct)
 840                 usb_string(dev, dev->descriptor.iProduct, dev->prod, sizeof(dev->prod));
 841         if (dev->descriptor.iSerialNumber)
 842                 usb_string(dev, dev->descriptor.iSerialNumber, dev->serial, sizeof(dev->serial));
 843         USB_PRINTF("Manufacturer %s\n", dev->mf);
 844         USB_PRINTF("Product      %s\n", dev->prod);
 845         USB_PRINTF("SerialNumber %s\n", dev->serial);
 846         /* now prode if the device is a hub */
 847         usb_hub_probe(dev,0);
 848         return 0;
 849 }
 850
 851 /* build device Tree  */
 852 void usb_scan_devices(void)
 853 {
 854         int i;
 855         struct usb_device *dev;
 856
 857         /* first make all devices unknown */
 858         for(i=0;i<USB_MAX_DEVICE;i++) {
 859                 memset(&usb_dev[i],0,sizeof(struct usb_device));
 860                 usb_dev[i].devnum=-1;
 861         }
 862         dev_index=0;
 863         /* device 0 is always present (root hub, so let it analyze) */
 864         dev=usb_alloc_new_device();
 865         usb_new_device(dev);
 866         printf("%d USB Device(s) found\n",dev_index);
 867         /* insert "driver" if possible */
 868 #ifdef CONFIG_USB_KEYBOARD
 869         drv_usb_kbd_init();
 870         USB_PRINTF("scan end\n");
 871 #endif
 872 }
 873
 874
 875 /****************************************************************************
 876  * HUB "Driver"
 877  * Probes device for being a hub and configurate it
 878  */
 879
 880 #undef  USB_HUB_DEBUG
 881
 882 #ifdef  USB_HUB_DEBUG
 883 #define USB_HUB_PRINTF(fmt,args...)     printf (fmt ,##args)
 884 #else
 885 #define USB_HUB_PRINTF(fmt,args...)
 886 #endif
 887
 888
 889 static struct usb_hub_device hub_dev[USB_MAX_HUB];
 890 static int usb_hub_index;
 891
 892
 893 int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
 894 {
 895         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 896                 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
 897                 USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
 898 }
 899
 900 int usb_clear_hub_feature(struct usb_device *dev, int feature)
 901 {
 902         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 903                 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, USB_CNTL_TIMEOUT);
 904 }
 905
 906 int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
 907 {
 908         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 909                 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port, NULL, 0, USB_CNTL_TIMEOUT);
 910 }
 911
 912 int usb_set_port_feature(struct usb_device *dev, int port, int feature)
 913 {
 914         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 915                 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port, NULL, 0, USB_CNTL_TIMEOUT);
 916 }
 917
 918 int usb_get_hub_status(struct usb_device *dev, void *data)
 919 {
 920         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 921                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
 922                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
 923 }
 924
 925 int usb_get_port_status(struct usb_device *dev, int port, void *data)
 926 {
 927         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 928                         USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
 929                         data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
 930 }
 931
 932
 933 static void usb_hub_power_on(struct usb_hub_device *hub)
 934 {
 935         int i;
 936         struct usb_device *dev;
 937
 938         dev=hub->pusb_dev;
 939         /* Enable power to the ports */
 940         USB_HUB_PRINTF("enabling power on all ports\n");
 941         for (i = 0; i < dev->maxchild; i++) {
 942                 usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
 943                 USB_HUB_PRINTF("port %d returns %lX\n",i+1,dev->status);
 944                 wait_ms(hub->desc.bPwrOn2PwrGood * 2);
 945         }
 946 }
 947
 948 void usb_hub_reset(void)
 949 {
 950         usb_hub_index=0;
 951 }
 952
 953 struct usb_hub_device *usb_hub_allocate(void)
 954 {
 955         if(usb_hub_index<USB_MAX_HUB) {
 956                 return &hub_dev[usb_hub_index++];
 957         }
 958         printf("ERROR: USB_MAX_HUB (%d) reached\n",USB_MAX_HUB);
 959         return NULL;
 960 }
 961
 962 #define MAX_TRIES 5
 963
 964 static int hub_port_reset(struct usb_device *dev, int port,
 965                         unsigned short *portstat)
 966 {
 967         int tries;
 968         struct usb_port_status portsts;
 969         unsigned short portstatus, portchange;
 970
 971
 972         USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
 973         for(tries=0;tries<MAX_TRIES;tries++) {
 974
 975                 usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 976                 wait_ms(200);
 977
 978                 if (usb_get_port_status(dev, port + 1, &portsts)<0) {
 979                         USB_HUB_PRINTF("get_port_status failed status %lX\n",dev->status);
 980                         return -1;
 981                 }
 982                 portstatus = swap_16(portsts.wPortStatus);
 983                 portchange = swap_16(portsts.wPortChange);
 984                 USB_HUB_PRINTF("portstatus %x, change %x, %s\n", portstatus ,portchange,
 985                         portstatus&(1<<USB_PORT_FEAT_LOWSPEED) ? "Low Speed" : "High Speed");
 986                 USB_HUB_PRINTF("STAT_C_CONNECTION = %d STAT_CONNECTION = %d  USB_PORT_STAT_ENABLE %d\n",
 987                         (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
 988                         (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
 989                         (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
 990                 if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
 991                     !(portstatus & USB_PORT_STAT_CONNECTION))
 992                         return -1;
 993
 994                 if (portstatus & USB_PORT_STAT_ENABLE) {
 995
 996                         break;
 997                 }
 998
 999                 wait_ms(200);
1000         }
1001
1002         if (tries==MAX_TRIES) {
1003                 USB_HUB_PRINTF("Cannot enable port %i after %i retries, disabling port.\n", port+1, MAX_TRIES);
1004                 USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
1005                 return -1;
1006         }
1007
1008         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
1009         *portstat = portstatus;
1010         return 0;
1011
1012 }
1013
1014
1015 void usb_hub_port_connect_change(struct usb_device *dev, int port)
1016 {
1017         struct usb_device *usb;
1018         struct usb_port_status portsts;
1019         unsigned short portstatus, portchange;
1020
1021         /* Check status */
1022         if (usb_get_port_status(dev, port + 1, &portsts)<0) {
1023                 USB_HUB_PRINTF("get_port_status failed\n");
1024                 return;
1025         }
1026
1027         portstatus = swap_16(portsts.wPortStatus);
1028         portchange = swap_16(portsts.wPortChange);
1029         USB_HUB_PRINTF("portstatus %x, change %x, %s\n", portstatus, portchange,
1030                 portstatus&(1<<USB_PORT_FEAT_LOWSPEED) ? "Low Speed" : "High Speed");
1031
1032         /* Clear the connection change status */
1033         usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
1034
1035         /* Disconnect any existing devices under this port */
1036         if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
1037              (!(portstatus & USB_PORT_STAT_ENABLE)))|| (dev->children[port])) {
1038                 USB_HUB_PRINTF("usb_disconnect(&hub->children[port]);\n");
1039                 /* Return now if nothing is connected */
1040                 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1041                         return;
1042         }
1043         wait_ms(200);
1044
1045         /* Reset the port */
1046         if (hub_port_reset(dev, port, &portstatus) < 0) {
1047                 printf("cannot reset port %i!?\n", port + 1);
1048                 return;
1049         }
1050
1051         wait_ms(200);
1052
1053         /* Allocate a new device struct for it */
1054         usb=usb_alloc_new_device();
1055         usb->slow = (portstatus & USB_PORT_STAT_LOW_SPEED) ? 1 : 0;
1056
1057         dev->children[port] = usb;
1058         usb->parent=dev;
1059         /* Run it through the hoops (find a driver, etc) */
1060         if (usb_new_device(usb)) {
1061                 /* Woops, disable the port */
1062                 USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
1063                 usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
1064         }
1065 }
1066
1067
1068 int usb_hub_configure(struct usb_device *dev)
1069 {
1070         unsigned char buffer[USB_BUFSIZ], *bitmap;
1071         struct usb_hub_descriptor *descriptor;
1072         struct usb_hub_status *hubsts;
1073         int i;
1074         struct usb_hub_device *hub;
1075
1076         /* "allocate" Hub device */
1077         hub=usb_hub_allocate();
1078         if(hub==NULL)
1079                 return -1;
1080         hub->pusb_dev=dev;
1081         /* Get the the hub descriptor */
1082         if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
1083                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub descriptor, giving up %lX\n",dev->status);
1084                 return -1;
1085         }
1086         descriptor = (struct usb_hub_descriptor *)buffer;
1087
1088         /* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
1089         i = descriptor->bLength;
1090         if (i > USB_BUFSIZ) {
1091                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub descriptor - too long: %d\N",
1092                         descriptor->bLength);
1093                 return -1;
1094         }
1095
1096         if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
1097                 USB_HUB_PRINTF("usb_hub_configure: failed to get hub descriptor 2nd giving up %lX\n",dev->status);
1098                 return -1;
1099         }
1100         memcpy((unsigned char *)&hub->desc,buffer,descriptor->bLength);
1101         /* adjust 16bit values */
1102         hub->desc.wHubCharacteristics=swap_16(descriptor->wHubCharacteristics);
1103         /* set the bitmap */
1104         bitmap=(unsigned char *)&hub->desc.DeviceRemovable[0];
1105         memset(bitmap,0xff,(USB_MAXCHILDREN+1+7)/8); /* devices not removable by default */
1106         bitmap=(unsigned char *)&hub->desc.PortPowerCtrlMask[0];
1107         memset(bitmap,0xff,(USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
1108         for(i=0;i<((hub->desc.bNbrPorts + 1 + 7)/8);i++) {
1109                 hub->desc.DeviceRemovable[i]=descriptor->DeviceRemovable[i];
1110         }
1111         for(i=0;i<((hub->desc.bNbrPorts + 1 + 7)/8);i++) {
1112                 hub->desc.DeviceRemovable[i]=descriptor->PortPowerCtrlMask[i];
1113         }
1114         dev->maxchild = descriptor->bNbrPorts;
1115         USB_HUB_PRINTF("%d ports detected\n", dev->maxchild);
1116
1117         switch (hub->desc.wHubCharacteristics & HUB_CHAR_LPSM) {
1118                 case 0x00:
1119                         USB_HUB_PRINTF("ganged power switching\n");
1120                         break;
1121                 case 0x01:
1122                         USB_HUB_PRINTF("individual port power switching\n");
1123                         break;
1124                 case 0x02:
1125                 case 0x03:
1126                         USB_HUB_PRINTF("unknown reserved power switching mode\n");
1127                         break;
1128         }
1129
1130         if (hub->desc.wHubCharacteristics & HUB_CHAR_COMPOUND)
1131                 USB_HUB_PRINTF("part of a compound device\n");
1132         else
1133                 USB_HUB_PRINTF("standalone hub\n");
1134
1135         switch (hub->desc.wHubCharacteristics & HUB_CHAR_OCPM) {
1136                 case 0x00:
1137                         USB_HUB_PRINTF("global over-current protection\n");
1138                         break;
1139                 case 0x08:
1140                         USB_HUB_PRINTF("individual port over-current protection\n");
1141                         break;
1142                 case 0x10:
1143                 case 0x18:
1144                         USB_HUB_PRINTF("no over-current protection\n");
1145       break;
1146         }
1147         USB_HUB_PRINTF("power on to power good time: %dms\n", descriptor->bPwrOn2PwrGood * 2);
1148         USB_HUB_PRINTF("hub controller current requirement: %dmA\n", descriptor->bHubContrCurrent);
1149         for (i = 0; i < dev->maxchild; i++)
1150                 USB_HUB_PRINTF("port %d is%s removable\n", i + 1,
1151                         hub->desc.DeviceRemovable[(i + 1)/8] & (1 << ((i + 1)%8)) ? " not" : "");
1152         if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
1153                 USB_HUB_PRINTF("usb_hub_configure: failed to get Status - too long: %d\n",
1154                         descriptor->bLength);
1155                 return -1;
1156         }
1157
1158         if (usb_get_hub_status(dev, buffer) < 0) {
1159                 USB_HUB_PRINTF("usb_hub_configure: failed to get Status %lX\n",dev->status);
1160                 return -1;
1161         }
1162         hubsts = (struct usb_hub_status *)buffer;
1163         USB_HUB_PRINTF("get_hub_status returned status %X, change %X\n",
1164                 swap_16(hubsts->wHubStatus),swap_16(hubsts->wHubChange));
1165         USB_HUB_PRINTF("local power source is %s\n",
1166                 (swap_16(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? "lost (inactive)" : "good");
1167         USB_HUB_PRINTF("%sover-current condition exists\n",
1168                 (swap_16(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1169         usb_hub_power_on(hub);
1170         for (i = 0; i < dev->maxchild; i++) {
1171                 struct usb_port_status portsts;
1172                 unsigned short portstatus, portchange;
1173
1174                 if (usb_get_port_status(dev, i + 1, &portsts) < 0) {
1175                         USB_HUB_PRINTF("get_port_status failed\n");
1176                         continue;
1177                 }
1178                 portstatus = swap_16(portsts.wPortStatus);
1179                 portchange = swap_16(portsts.wPortChange);
1180                 USB_HUB_PRINTF("Port %d Status %X Change %X\n",i+1,portstatus,portchange);
1181                 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1182                         USB_HUB_PRINTF("port %d connection change\n", i + 1);
1183                         usb_hub_port_connect_change(dev, i);
1184                 }
1185                 if (portchange & USB_PORT_STAT_C_ENABLE) {
1186                         USB_HUB_PRINTF("port %d enable change, status %x\n", i + 1, portstatus);
1187                         usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
1188
1189                         /* EM interference sometimes causes bad shielded USB devices to
1190                          * be shutdown by the hub, this hack enables them again.
1191                          * Works at least with mouse driver */
1192                         if (!(portstatus & USB_PORT_STAT_ENABLE) &&
1193                                 (portstatus & USB_PORT_STAT_CONNECTION) && (dev->children[i])) {
1194                                 USB_HUB_PRINTF("already running port %i disabled by hub (EMI?), re-enabling...\n",
1195                                         i + 1);
1196                                         usb_hub_port_connect_change(dev, i);
1197                         }
1198                 }
1199                 if (portstatus & USB_PORT_STAT_SUSPEND) {
1200                         USB_HUB_PRINTF("port %d suspend change\n", i + 1);
1201                         usb_clear_port_feature(dev, i + 1,  USB_PORT_FEAT_SUSPEND);
1202                 }
1203
1204                 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
1205                         USB_HUB_PRINTF("port %d over-current change\n", i + 1);
1206                         usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_OVER_CURRENT);
1207                         usb_hub_power_on(hub);
1208                 }
1209
1210                 if (portchange & USB_PORT_STAT_C_RESET) {
1211                         USB_HUB_PRINTF("port %d reset change\n", i + 1);
1212                         usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
1213                 }
1214         } /* end for i all ports */
1215
1216         return 0;
1217 }
1218
1219 int usb_hub_probe(struct usb_device *dev, int ifnum)
1220 {
1221         struct usb_interface_descriptor *iface;
1222         struct usb_endpoint_descriptor *ep;
1223         int ret;
1224
1225         iface = &dev->config.if_desc[ifnum];
1226         /* Is it a hub? */
1227         if (iface->bInterfaceClass != USB_CLASS_HUB)
1228                 return 0;
1229         /* Some hubs have a subclass of 1, which AFAICT according to the */
1230         /*  specs is not defined, but it works */
1231         if ((iface->bInterfaceSubClass != 0) &&
1232             (iface->bInterfaceSubClass != 1))
1233                 return 0;
1234         /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1235         if (iface->bNumEndpoints != 1)
1236                 return 0;
1237         ep = &iface->ep_desc[0];
1238         /* Output endpoint? Curiousier and curiousier.. */
1239         if (!(ep->bEndpointAddress & USB_DIR_IN))
1240                 return 0;
1241         /* If it's not an interrupt endpoint, we'd better punt! */
1242         if ((ep->bmAttributes & 3) != 3)
1243                 return 0;
1244         /* We found a hub */
1245         USB_HUB_PRINTF("USB hub found\n");
1246         ret=usb_hub_configure(dev);
1247         return ret;
1248 }
1249
1250 #endif
1251
1252 /* EOF */