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