common/usb.c

   1 /*
   2  * Most of this source has been derived from the Linux USB
   3  * project:
   4  * (C) Copyright Linus Torvalds 1999
   5  * (C) Copyright Johannes Erdfelt 1999-2001
   6  * (C) Copyright Andreas Gal 1999
   7  * (C) Copyright Gregory P. Smith 1999
   8  * (C) Copyright Deti Fliegl 1999 (new USB architecture)
   9  * (C) Copyright Randy Dunlap 2000
  10  * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
  11  * (C) Copyright Yggdrasil Computing, Inc. 2000
  12  *     (usb_device_id matching changes by Adam J. Richter)
  13  *
  14  * Adapted for U-Boot:
  15  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
  16  *
  17  * SPDX-License-Identifier:     GPL-2.0+
  18  */
  19
  20 /*
  21  * How it works:
  22  *
  23  * Since this is a bootloader, the devices will not be automatic
  24  * (re)configured on hotplug, but after a restart of the USB the
  25  * device should work.
  26  *
  27  * For each transfer (except "Interrupt") we wait for completion.
  28  */
  29 #include <common.h>
  30 #include <command.h>
  31 #include <asm/processor.h>
  32 #include <linux/compiler.h>
  33 #include <linux/ctype.h>
  34 #include <asm/byteorder.h>
  35 #include <asm/unaligned.h>
  36
  37 #include <usb.h>
  38 #ifdef CONFIG_4xx
  39 #include <asm/4xx_pci.h>
  40 #endif
  41
  42 #define USB_BUFSIZ      512
  43
  44 static struct usb_device usb_dev[USB_MAX_DEVICE];
  45 static int dev_index;
  46 static int asynch_allowed;
  47
  48 char usb_started; /* flag for the started/stopped USB status */
  49
  50 #ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
  51 #define CONFIG_USB_MAX_CONTROLLER_COUNT 1
  52 #endif
  53
  54 /***************************************************************************
  55  * Init USB Device
  56  */
  57 int usb_init(void)
  58 {
  59         void *ctrl;
  60         struct usb_device *dev;
  61         int i, start_index = 0;
  62
  63         dev_index = 0;
  64         asynch_allowed = 1;
  65         usb_hub_reset();
  66
  67         /* first make all devices unknown */
  68         for (i = 0; i < USB_MAX_DEVICE; i++) {
  69                 memset(&usb_dev[i], 0, sizeof(struct usb_device));
  70                 usb_dev[i].devnum = -1;
  71         }
  72
  73         /* init low_level USB */
  74         for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
  75                 /* init low_level USB */
  76                 printf("USB%d:   ", i);
  77                 if (usb_lowlevel_init(i, &ctrl)) {
  78                         puts("lowlevel init failed\n");
  79                         continue;
  80                 }
  81                 /*
  82                  * lowlevel init is OK, now scan the bus for devices
  83                  * i.e. search HUBs and configure them
  84                  */
  85                 start_index = dev_index;
  86                 printf("scanning bus %d for devices... ", i);
  87                 dev = usb_alloc_new_device(ctrl);
  88                 /*
  89                  * device 0 is always present
  90                  * (root hub, so let it analyze)
  91                  */
  92                 if (dev)
  93                         usb_new_device(dev);
  94
  95                 if (start_index == dev_index)
  96                         puts("No USB Device found\n");
  97                 else
  98                         printf("%d USB Device(s) found\n",
  99                                 dev_index - start_index);
 100
 101                 usb_started = 1;
 102         }
 103
 104         debug("scan end\n");
 105         /* if we were not able to find at least one working bus, bail out */
 106         if (!usb_started) {
 107                 puts("USB error: all controllers failed lowlevel init\n");
 108                 return -1;
 109         }
 110
 111         return 0;
 112 }
 113
 114 /******************************************************************************
 115  * Stop USB this stops the LowLevel Part and deregisters USB devices.
 116  */
 117 int usb_stop(void)
 118 {
 119         int i;
 120
 121         if (usb_started) {
 122                 asynch_allowed = 1;
 123                 usb_started = 0;
 124                 usb_hub_reset();
 125
 126                 for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
 127                         if (usb_lowlevel_stop(i))
 128                                 printf("failed to stop USB controller %d\n", i);
 129                 }
 130         }
 131
 132         return 0;
 133 }
 134
 135 /*
 136  * disables the asynch behaviour of the control message. This is used for data
 137  * transfers that uses the exclusiv access to the control and bulk messages.
 138  * Returns the old value so it can be restored later.
 139  */
 140 int usb_disable_asynch(int disable)
 141 {
 142         int old_value = asynch_allowed;
 143
 144         asynch_allowed = !disable;
 145         return old_value;
 146 }
 147
 148
 149 /*-------------------------------------------------------------------
 150  * Message wrappers.
 151  *
 152  */
 153
 154 /*
 155  * submits an Interrupt Message
 156  */
 157 int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
 158                         void *buffer, int transfer_len, int interval)
 159 {
 160         return submit_int_msg(dev, pipe, buffer, transfer_len, interval);
 161 }
 162
 163 /*
 164  * submits a control message and waits for comletion (at least timeout * 1ms)
 165  * If timeout is 0, we don't wait for completion (used as example to set and
 166  * clear keyboards LEDs). For data transfers, (storage transfers) we don't
 167  * allow control messages with 0 timeout, by previousely resetting the flag
 168  * asynch_allowed (usb_disable_asynch(1)).
 169  * returns the transfered length if OK or -1 if error. The transfered length
 170  * and the current status are stored in the dev->act_len and dev->status.
 171  */
 172 int usb_control_msg(struct usb_device *dev, unsigned int pipe,
 173                         unsigned char request, unsigned char requesttype,
 174                         unsigned short value, unsigned short index,
 175                         void *data, unsigned short size, int timeout)
 176 {
 177         ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
 178
 179         if ((timeout == 0) && (!asynch_allowed)) {
 180                 /* request for a asynch control pipe is not allowed */
 181                 return -1;
 182         }
 183
 184         /* set setup command */
 185         setup_packet->requesttype = requesttype;
 186         setup_packet->request = request;
 187         setup_packet->value = cpu_to_le16(value);
 188         setup_packet->index = cpu_to_le16(index);
 189         setup_packet->length = cpu_to_le16(size);
 190         debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
 191               "value 0x%X index 0x%X length 0x%X\n",
 192               request, requesttype, value, index, size);
 193         dev->status = USB_ST_NOT_PROC; /*not yet processed */
 194
 195         if (submit_control_msg(dev, pipe, data, size, setup_packet) < 0)
 196                 return -1;
 197         if (timeout == 0)
 198                 return (int)size;
 199
 200         /*
 201          * Wait for status to update until timeout expires, USB driver
 202          * interrupt handler may set the status when the USB operation has
 203          * been completed.
 204          */
 205         while (timeout--) {
 206                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 207                         break;
 208                 mdelay(1);
 209         }
 210         if (dev->status)
 211                 return -1;
 212
 213         return dev->act_len;
 214
 215 }
 216
 217 /*-------------------------------------------------------------------
 218  * submits bulk message, and waits for completion. returns 0 if Ok or
 219  * -1 if Error.
 220  * synchronous behavior
 221  */
 222 int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
 223                         void *data, int len, int *actual_length, int timeout)
 224 {
 225         if (len < 0)
 226                 return -1;
 227         dev->status = USB_ST_NOT_PROC; /*not yet processed */
 228         if (submit_bulk_msg(dev, pipe, data, len) < 0)
 229                 return -1;
 230         while (timeout--) {
 231                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 232                         break;
 233                 mdelay(1);
 234         }
 235         *actual_length = dev->act_len;
 236         if (dev->status == 0)
 237                 return 0;
 238         else
 239                 return -1;
 240 }
 241
 242
 243 /*-------------------------------------------------------------------
 244  * Max Packet stuff
 245  */
 246
 247 /*
 248  * returns the max packet size, depending on the pipe direction and
 249  * the configurations values
 250  */
 251 int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
 252 {
 253         /* direction is out -> use emaxpacket out */
 254         if ((pipe & USB_DIR_IN) == 0)
 255                 return dev->epmaxpacketout[((pipe>>15) & 0xf)];
 256         else
 257                 return dev->epmaxpacketin[((pipe>>15) & 0xf)];
 258 }
 259
 260 /*
 261  * The routine usb_set_maxpacket_ep() is extracted from the loop of routine
 262  * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
 263  * when it is inlined in 1 single routine. What happens is that the register r3
 264  * is used as loop-count 'i', but gets overwritten later on.
 265  * This is clearly a compiler bug, but it is easier to workaround it here than
 266  * to update the compiler (Occurs with at least several GCC 4.{1,2},x
 267  * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
 268  *
 269  * NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
 270  */
 271 static void noinline
 272 usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
 273 {
 274         int b;
 275         struct usb_endpoint_descriptor *ep;
 276         u16 ep_wMaxPacketSize;
 277
 278         ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
 279
 280         b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 281         ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
 282
 283         if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 284                                                 USB_ENDPOINT_XFER_CONTROL) {
 285                 /* Control => bidirectional */
 286                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
 287                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
 288                 debug("##Control EP epmaxpacketout/in[%d] = %d\n",
 289                       b, dev->epmaxpacketin[b]);
 290         } else {
 291                 if ((ep->bEndpointAddress & 0x80) == 0) {
 292                         /* OUT Endpoint */
 293                         if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
 294                                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
 295                                 debug("##EP epmaxpacketout[%d] = %d\n",
 296                                       b, dev->epmaxpacketout[b]);
 297                         }
 298                 } else {
 299                         /* IN Endpoint */
 300                         if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
 301                                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
 302                                 debug("##EP epmaxpacketin[%d] = %d\n",
 303                                       b, dev->epmaxpacketin[b]);
 304                         }
 305                 } /* if out */
 306         } /* if control */
 307 }
 308
 309 /*
 310  * set the max packed value of all endpoints in the given configuration
 311  */
 312 static int usb_set_maxpacket(struct usb_device *dev)
 313 {
 314         int i, ii;
 315
 316         for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
 317                 for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
 318                         usb_set_maxpacket_ep(dev, i, ii);
 319
 320         return 0;
 321 }
 322
 323 /*******************************************************************************
 324  * Parse the config, located in buffer, and fills the dev->config structure.
 325  * Note that all little/big endian swapping are done automatically.
 326  */
 327 static int usb_parse_config(struct usb_device *dev,
 328                         unsigned char *buffer, int cfgno)
 329 {
 330         struct usb_descriptor_header *head;
 331         int index, ifno, epno, curr_if_num;
 332         u16 ep_wMaxPacketSize;
 333         struct usb_interface *if_desc = NULL;
 334
 335         ifno = -1;
 336         epno = -1;
 337         curr_if_num = -1;
 338
 339         dev->configno = cfgno;
 340         head = (struct usb_descriptor_header *) &buffer[0];
 341         if (head->bDescriptorType != USB_DT_CONFIG) {
 342                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
 343                         head->bDescriptorType);
 344                 return -1;
 345         }
 346         memcpy(&dev->config, buffer, buffer[0]);
 347         le16_to_cpus(&(dev->config.desc.wTotalLength));
 348         dev->config.no_of_if = 0;
 349
 350         index = dev->config.desc.bLength;
 351         /* Ok the first entry must be a configuration entry,
 352          * now process the others */
 353         head = (struct usb_descriptor_header *) &buffer[index];
 354         while (index + 1 < dev->config.desc.wTotalLength) {
 355                 switch (head->bDescriptorType) {
 356                 case USB_DT_INTERFACE:
 357                         if (((struct usb_interface_descriptor *) \
 358                              &buffer[index])->bInterfaceNumber != curr_if_num) {
 359                                 /* this is a new interface, copy new desc */
 360                                 ifno = dev->config.no_of_if;
 361                                 if_desc = &dev->config.if_desc[ifno];
 362                                 dev->config.no_of_if++;
 363                                 memcpy(if_desc, &buffer[index], buffer[index]);
 364                                 if_desc->no_of_ep = 0;
 365                                 if_desc->num_altsetting = 1;
 366                                 curr_if_num =
 367                                      if_desc->desc.bInterfaceNumber;
 368                         } else {
 369                                 /* found alternate setting for the interface */
 370                                 if (ifno >= 0) {
 371                                         if_desc = &dev->config.if_desc[ifno];
 372                                         if_desc->num_altsetting++;
 373                                 }
 374                         }
 375                         break;
 376                 case USB_DT_ENDPOINT:
 377                         epno = dev->config.if_desc[ifno].no_of_ep;
 378                         if_desc = &dev->config.if_desc[ifno];
 379                         /* found an endpoint */
 380                         if_desc->no_of_ep++;
 381                         memcpy(&if_desc->ep_desc[epno],
 382                                 &buffer[index], buffer[index]);
 383                         ep_wMaxPacketSize = get_unaligned(&dev->config.\
 384                                                         if_desc[ifno].\
 385                                                         ep_desc[epno].\
 386                                                         wMaxPacketSize);
 387                         put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
 388                                         &dev->config.\
 389                                         if_desc[ifno].\
 390                                         ep_desc[epno].\
 391                                         wMaxPacketSize);
 392                         debug("if %d, ep %d\n", ifno, epno);
 393                         break;
 394                 case USB_DT_SS_ENDPOINT_COMP:
 395                         if_desc = &dev->config.if_desc[ifno];
 396                         memcpy(&if_desc->ss_ep_comp_desc[epno],
 397                                 &buffer[index], buffer[index]);
 398                         break;
 399                 default:
 400                         if (head->bLength == 0)
 401                                 return 1;
 402
 403                         debug("unknown Description Type : %x\n",
 404                               head->bDescriptorType);
 405
 406 #ifdef DEBUG
 407                         {
 408                                 unsigned char *ch = (unsigned char *)head;
 409                                 int i;
 410
 411                                 for (i = 0; i < head->bLength; i++)
 412                                         debug("%02X ", *ch++);
 413                                 debug("\n\n\n");
 414                         }
 415 #endif
 416                         break;
 417                 }
 418                 index += head->bLength;
 419                 head = (struct usb_descriptor_header *)&buffer[index];
 420         }
 421         return 1;
 422 }
 423
 424 /***********************************************************************
 425  * Clears an endpoint
 426  * endp: endpoint number in bits 0-3;
 427  * direction flag in bit 7 (1 = IN, 0 = OUT)
 428  */
 429 int usb_clear_halt(struct usb_device *dev, int pipe)
 430 {
 431         int result;
 432         int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
 433
 434         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 435                                  USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
 436                                  endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
 437
 438         /* don't clear if failed */
 439         if (result < 0)
 440                 return result;
 441
 442         /*
 443          * NOTE: we do not get status and verify reset was successful
 444          * as some devices are reported to lock up upon this check..
 445          */
 446
 447         usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
 448
 449         /* toggle is reset on clear */
 450         usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
 451         return 0;
 452 }
 453
 454
 455 /**********************************************************************
 456  * get_descriptor type
 457  */
 458 static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
 459                         unsigned char index, void *buf, int size)
 460 {
 461         int res;
 462         res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 463                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 464                         (type << 8) + index, 0,
 465                         buf, size, USB_CNTL_TIMEOUT);
 466         return res;
 467 }
 468
 469 /**********************************************************************
 470  * gets configuration cfgno and store it in the buffer
 471  */
 472 int usb_get_configuration_no(struct usb_device *dev,
 473                              unsigned char *buffer, int cfgno)
 474 {
 475         int result;
 476         unsigned int tmp;
 477         struct usb_config_descriptor *config;
 478
 479         config = (struct usb_config_descriptor *)&buffer[0];
 480         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
 481         if (result < 9) {
 482                 if (result < 0)
 483                         printf("unable to get descriptor, error %lX\n",
 484                                 dev->status);
 485                 else
 486                         printf("config descriptor too short " \
 487                                 "(expected %i, got %i)\n", 9, result);
 488                 return -1;
 489         }
 490         tmp = le16_to_cpu(config->wTotalLength);
 491
 492         if (tmp > USB_BUFSIZ) {
 493                 printf("usb_get_configuration_no: failed to get " \
 494                        "descriptor - too long: %d\n", tmp);
 495                 return -1;
 496         }
 497
 498         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
 499         debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result, tmp);
 500         return result;
 501 }
 502
 503 /********************************************************************
 504  * set address of a device to the value in dev->devnum.
 505  * This can only be done by addressing the device via the default address (0)
 506  */
 507 static int usb_set_address(struct usb_device *dev)
 508 {
 509         int res;
 510
 511         debug("set address %d\n", dev->devnum);
 512         res = usb_control_msg(dev, usb_snddefctrl(dev),
 513                                 USB_REQ_SET_ADDRESS, 0,
 514                                 (dev->devnum), 0,
 515                                 NULL, 0, USB_CNTL_TIMEOUT);
 516         return res;
 517 }
 518
 519 /********************************************************************
 520  * set interface number to interface
 521  */
 522 int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 523 {
 524         struct usb_interface *if_face = NULL;
 525         int ret, i;
 526
 527         for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
 528                 if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
 529                         if_face = &dev->config.if_desc[i];
 530                         break;
 531                 }
 532         }
 533         if (!if_face) {
 534                 printf("selecting invalid interface %d", interface);
 535                 return -1;
 536         }
 537         /*
 538          * We should return now for devices with only one alternate setting.
 539          * According to 9.4.10 of the Universal Serial Bus Specification
 540          * Revision 2.0 such devices can return with a STALL. This results in
 541          * some USB sticks timeouting during initialization and then being
 542          * unusable in U-Boot.
 543          */
 544         if (if_face->num_altsetting == 1)
 545                 return 0;
 546
 547         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 548                                 USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
 549                                 alternate, interface, NULL, 0,
 550                                 USB_CNTL_TIMEOUT * 5);
 551         if (ret < 0)
 552                 return ret;
 553
 554         return 0;
 555 }
 556
 557 /********************************************************************
 558  * set configuration number to configuration
 559  */
 560 static int usb_set_configuration(struct usb_device *dev, int configuration)
 561 {
 562         int res;
 563         debug("set configuration %d\n", configuration);
 564         /* set setup command */
 565         res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 566                                 USB_REQ_SET_CONFIGURATION, 0,
 567                                 configuration, 0,
 568                                 NULL, 0, USB_CNTL_TIMEOUT);
 569         if (res == 0) {
 570                 dev->toggle[0] = 0;
 571                 dev->toggle[1] = 0;
 572                 return 0;
 573         } else
 574                 return -1;
 575 }
 576
 577 /********************************************************************
 578  * set protocol to protocol
 579  */
 580 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
 581 {
 582         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 583                 USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 584                 protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 585 }
 586
 587 /********************************************************************
 588  * set idle
 589  */
 590 int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
 591 {
 592         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 593                 USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 594                 (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 595 }
 596
 597 /********************************************************************
 598  * get report
 599  */
 600 int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
 601                    unsigned char id, void *buf, int size)
 602 {
 603         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 604                         USB_REQ_GET_REPORT,
 605                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 606                         (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 607 }
 608
 609 /********************************************************************
 610  * get class descriptor
 611  */
 612 int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
 613                 unsigned char type, unsigned char id, void *buf, int size)
 614 {
 615         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 616                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 617                 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 618 }
 619
 620 /********************************************************************
 621  * get string index in buffer
 622  */
 623 static int usb_get_string(struct usb_device *dev, unsigned short langid,
 624                    unsigned char index, void *buf, int size)
 625 {
 626         int i;
 627         int result;
 628
 629         for (i = 0; i < 3; ++i) {
 630                 /* some devices are flaky */
 631                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 632                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 633                         (USB_DT_STRING << 8) + index, langid, buf, size,
 634                         USB_CNTL_TIMEOUT);
 635
 636                 if (result > 0)
 637                         break;
 638         }
 639
 640         return result;
 641 }
 642
 643
 644 static void usb_try_string_workarounds(unsigned char *buf, int *length)
 645 {
 646         int newlength, oldlength = *length;
 647
 648         for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
 649                 if (!isprint(buf[newlength]) || buf[newlength + 1])
 650                         break;
 651
 652         if (newlength > 2) {
 653                 buf[0] = newlength;
 654                 *length = newlength;
 655         }
 656 }
 657
 658
 659 static int usb_string_sub(struct usb_device *dev, unsigned int langid,
 660                 unsigned int index, unsigned char *buf)
 661 {
 662         int rc;
 663
 664         /* Try to read the string descriptor by asking for the maximum
 665          * possible number of bytes */
 666         rc = usb_get_string(dev, langid, index, buf, 255);
 667
 668         /* If that failed try to read the descriptor length, then
 669          * ask for just that many bytes */
 670         if (rc < 2) {
 671                 rc = usb_get_string(dev, langid, index, buf, 2);
 672                 if (rc == 2)
 673                         rc = usb_get_string(dev, langid, index, buf, buf[0]);
 674         }
 675
 676         if (rc >= 2) {
 677                 if (!buf[0] && !buf[1])
 678                         usb_try_string_workarounds(buf, &rc);
 679
 680                 /* There might be extra junk at the end of the descriptor */
 681                 if (buf[0] < rc)
 682                         rc = buf[0];
 683
 684                 rc = rc - (rc & 1); /* force a multiple of two */
 685         }
 686
 687         if (rc < 2)
 688                 rc = -1;
 689
 690         return rc;
 691 }
 692
 693
 694 /********************************************************************
 695  * usb_string:
 696  * Get string index and translate it to ascii.
 697  * returns string length (> 0) or error (< 0)
 698  */
 699 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 700 {
 701         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
 702         unsigned char *tbuf;
 703         int err;
 704         unsigned int u, idx;
 705
 706         if (size <= 0 || !buf || !index)
 707                 return -1;
 708         buf[0] = 0;
 709         tbuf = &mybuf[0];
 710
 711         /* get langid for strings if it's not yet known */
 712         if (!dev->have_langid) {
 713                 err = usb_string_sub(dev, 0, 0, tbuf);
 714                 if (err < 0) {
 715                         debug("error getting string descriptor 0 " \
 716                               "(error=%lx)\n", dev->status);
 717                         return -1;
 718                 } else if (tbuf[0] < 4) {
 719                         debug("string descriptor 0 too short\n");
 720                         return -1;
 721                 } else {
 722                         dev->have_langid = -1;
 723                         dev->string_langid = tbuf[2] | (tbuf[3] << 8);
 724                                 /* always use the first langid listed */
 725                         debug("USB device number %d default " \
 726                               "language ID 0x%x\n",
 727                               dev->devnum, dev->string_langid);
 728                 }
 729         }
 730
 731         err = usb_string_sub(dev, dev->string_langid, index, tbuf);
 732         if (err < 0)
 733                 return err;
 734
 735         size--;         /* leave room for trailing NULL char in output buffer */
 736         for (idx = 0, u = 2; u < err; u += 2) {
 737                 if (idx >= size)
 738                         break;
 739                 if (tbuf[u+1])                  /* high byte */
 740                         buf[idx++] = '?';  /* non-ASCII character */
 741                 else
 742                         buf[idx++] = tbuf[u];
 743         }
 744         buf[idx] = 0;
 745         err = idx;
 746         return err;
 747 }
 748
 749
 750 /********************************************************************
 751  * USB device handling:
 752  * the USB device are static allocated [USB_MAX_DEVICE].
 753  */
 754
 755
 756 /* returns a pointer to the device with the index [index].
 757  * if the device is not assigned (dev->devnum==-1) returns NULL
 758  */
 759 struct usb_device *usb_get_dev_index(int index)
 760 {
 761         if (usb_dev[index].devnum == -1)
 762                 return NULL;
 763         else
 764                 return &usb_dev[index];
 765 }
 766
 767 /* returns a pointer of a new device structure or NULL, if
 768  * no device struct is available
 769  */
 770 struct usb_device *usb_alloc_new_device(void *controller)
 771 {
 772         int i;
 773         debug("New Device %d\n", dev_index);
 774         if (dev_index == USB_MAX_DEVICE) {
 775                 printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
 776                 return NULL;
 777         }
 778         /* default Address is 0, real addresses start with 1 */
 779         usb_dev[dev_index].devnum = dev_index + 1;
 780         usb_dev[dev_index].maxchild = 0;
 781         for (i = 0; i < USB_MAXCHILDREN; i++)
 782                 usb_dev[dev_index].children[i] = NULL;
 783         usb_dev[dev_index].parent = NULL;
 784         usb_dev[dev_index].controller = controller;
 785         dev_index++;
 786         return &usb_dev[dev_index - 1];
 787 }
 788
 789 /*
 790  * Free the newly created device node.
 791  * Called in error cases where configuring a newly attached
 792  * device fails for some reason.
 793  */
 794 void usb_free_device(void)
 795 {
 796         dev_index--;
 797         debug("Freeing device node: %d\n", dev_index);
 798         memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
 799         usb_dev[dev_index].devnum = -1;
 800 }
 801
 802 /*
 803  * By the time we get here, the device has gotten a new device ID
 804  * and is in the default state. We need to identify the thing and
 805  * get the ball rolling..
 806  *
 807  * Returns 0 for success, != 0 for error.
 808  */
 809 int usb_new_device(struct usb_device *dev)
 810 {
 811         int addr, err;
 812         int tmp;
 813         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
 814
 815         /* We still haven't set the Address yet */
 816         addr = dev->devnum;
 817         dev->devnum = 0;
 818
 819 #ifdef CONFIG_LEGACY_USB_INIT_SEQ
 820         /* this is the old and known way of initializing devices, it is
 821          * different than what Windows and Linux are doing. Windows and Linux
 822          * both retrieve 64 bytes while reading the device descriptor
 823          * Several USB stick devices report ERR: CTL_TIMEOUT, caused by an
 824          * invalid header while reading 8 bytes as device descriptor. */
 825         dev->descriptor.bMaxPacketSize0 = 8;        /* Start off at 8 bytes  */
 826         dev->maxpacketsize = PACKET_SIZE_8;
 827         dev->epmaxpacketin[0] = 8;
 828         dev->epmaxpacketout[0] = 8;
 829
 830         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, tmpbuf, 8);
 831         if (err < 8) {
 832                 printf("\n      USB device not responding, " \
 833                        "giving up (status=%lX)\n", dev->status);
 834                 return 1;
 835         }
 836         memcpy(&dev->descriptor, tmpbuf, 8);
 837 #else
 838         /* This is a Windows scheme of initialization sequence, with double
 839          * reset of the device (Linux uses the same sequence)
 840          * Some equipment is said to work only with such init sequence; this
 841          * patch is based on the work by Alan Stern:
 842          * http://sourceforge.net/mailarchive/forum.php?
 843          * thread_id=5729457&forum_id=5398
 844          */
 845         struct usb_device_descriptor *desc;
 846         int port = -1;
 847         struct usb_device *parent = dev->parent;
 848         unsigned short portstatus;
 849
 850         /* send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
 851          * only 18 bytes long, this will terminate with a short packet.  But if
 852          * the maxpacket size is 8 or 16 the device may be waiting to transmit
 853          * some more, or keeps on retransmitting the 8 byte header. */
 854
 855         desc = (struct usb_device_descriptor *)tmpbuf;
 856         dev->descriptor.bMaxPacketSize0 = 64;       /* Start off at 64 bytes  */
 857         /* Default to 64 byte max packet size */
 858         dev->maxpacketsize = PACKET_SIZE_64;
 859         dev->epmaxpacketin[0] = 64;
 860         dev->epmaxpacketout[0] = 64;
 861
 862         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
 863         if (err < 0) {
 864                 debug("usb_new_device: usb_get_descriptor() failed\n");
 865                 return 1;
 866         }
 867
 868         dev->descriptor.bMaxPacketSize0 = desc->bMaxPacketSize0;
 869         /*
 870          * Fetch the device class, driver can use this info
 871          * to differentiate between HUB and DEVICE.
 872          */
 873         dev->descriptor.bDeviceClass = desc->bDeviceClass;
 874
 875         /* find the port number we're at */
 876         if (parent) {
 877                 int j;
 878
 879                 for (j = 0; j < parent->maxchild; j++) {
 880                         if (parent->children[j] == dev) {
 881                                 port = j;
 882                                 break;
 883                         }
 884                 }
 885                 if (port < 0) {
 886                         printf("usb_new_device:cannot locate device's port.\n");
 887                         return 1;
 888                 }
 889
 890                 /* reset the port for the second time */
 891                 err = hub_port_reset(dev->parent, port, &portstatus);
 892                 if (err < 0) {
 893                         printf("\n     Couldn't reset port %i\n", port);
 894                         return 1;
 895                 }
 896         }
 897 #endif
 898
 899         dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
 900         dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
 901         switch (dev->descriptor.bMaxPacketSize0) {
 902         case 8:
 903                 dev->maxpacketsize  = PACKET_SIZE_8;
 904                 break;
 905         case 16:
 906                 dev->maxpacketsize = PACKET_SIZE_16;
 907                 break;
 908         case 32:
 909                 dev->maxpacketsize = PACKET_SIZE_32;
 910                 break;
 911         case 64:
 912                 dev->maxpacketsize = PACKET_SIZE_64;
 913                 break;
 914         }
 915         dev->devnum = addr;
 916
 917         err = usb_set_address(dev); /* set address */
 918
 919         if (err < 0) {
 920                 printf("\n      USB device not accepting new address " \
 921                         "(error=%lX)\n", dev->status);
 922                 return 1;
 923         }
 924
 925         mdelay(10);     /* Let the SET_ADDRESS settle */
 926
 927         tmp = sizeof(dev->descriptor);
 928
 929         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 930                                  tmpbuf, sizeof(dev->descriptor));
 931         if (err < tmp) {
 932                 if (err < 0)
 933                         printf("unable to get device descriptor (error=%d)\n",
 934                                err);
 935                 else
 936                         printf("USB device descriptor short read " \
 937                                 "(expected %i, got %i)\n", tmp, err);
 938                 return 1;
 939         }
 940         memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));
 941         /* correct le values */
 942         le16_to_cpus(&dev->descriptor.bcdUSB);
 943         le16_to_cpus(&dev->descriptor.idVendor);
 944         le16_to_cpus(&dev->descriptor.idProduct);
 945         le16_to_cpus(&dev->descriptor.bcdDevice);
 946         /* only support for one config for now */
 947         err = usb_get_configuration_no(dev, tmpbuf, 0);
 948         if (err < 0) {
 949                 printf("usb_new_device: Cannot read configuration, " \
 950                        "skipping device %04x:%04x\n",
 951                        dev->descriptor.idVendor, dev->descriptor.idProduct);
 952                 return -1;
 953         }
 954         usb_parse_config(dev, tmpbuf, 0);
 955         usb_set_maxpacket(dev);
 956         /* we set the default configuration here */
 957         if (usb_set_configuration(dev, dev->config.desc.bConfigurationValue)) {
 958                 printf("failed to set default configuration " \
 959                         "len %d, status %lX\n", dev->act_len, dev->status);
 960                 return -1;
 961         }
 962         debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
 963               dev->descriptor.iManufacturer, dev->descriptor.iProduct,
 964               dev->descriptor.iSerialNumber);
 965         memset(dev->mf, 0, sizeof(dev->mf));
 966         memset(dev->prod, 0, sizeof(dev->prod));
 967         memset(dev->serial, 0, sizeof(dev->serial));
 968         if (dev->descriptor.iManufacturer)
 969                 usb_string(dev, dev->descriptor.iManufacturer,
 970                            dev->mf, sizeof(dev->mf));
 971         if (dev->descriptor.iProduct)
 972                 usb_string(dev, dev->descriptor.iProduct,
 973                            dev->prod, sizeof(dev->prod));
 974         if (dev->descriptor.iSerialNumber)
 975                 usb_string(dev, dev->descriptor.iSerialNumber,
 976                            dev->serial, sizeof(dev->serial));
 977         debug("Manufacturer %s\n", dev->mf);
 978         debug("Product      %s\n", dev->prod);
 979         debug("SerialNumber %s\n", dev->serial);
 980         /* now prode if the device is a hub */
 981         usb_hub_probe(dev, 0);
 982         return 0;
 983 }
 984
 985 /* EOF */