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 #define USB_BUFSIZ      512
  61
  62 static struct usb_device usb_dev[USB_MAX_DEVICE];
  63 static int dev_index;
  64 static int asynch_allowed;
  65
  66 char usb_started; /* flag for the started/stopped USB status */
  67
  68 #ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
  69 #define CONFIG_USB_MAX_CONTROLLER_COUNT 1
  70 #endif
  71
  72 /***************************************************************************
  73  * Init USB Device
  74  */
  75 int usb_init(void)
  76 {
  77         void *ctrl;
  78         struct usb_device *dev;
  79         int i, start_index = 0;
  80
  81         dev_index = 0;
  82         asynch_allowed = 1;
  83         usb_hub_reset();
  84
  85         /* first make all devices unknown */
  86         for (i = 0; i < USB_MAX_DEVICE; i++) {
  87                 memset(&usb_dev[i], 0, sizeof(struct usb_device));
  88                 usb_dev[i].devnum = -1;
  89         }
  90
  91         /* init low_level USB */
  92         for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
  93                 /* init low_level USB */
  94                 printf("USB%d:   ", i);
  95                 if (usb_lowlevel_init(i, &ctrl)) {
  96                         puts("lowlevel init failed\n");
  97                         continue;
  98                 }
  99                 /*
 100                  * lowlevel init is OK, now scan the bus for devices
 101                  * i.e. search HUBs and configure them
 102                  */
 103                 start_index = dev_index;
 104                 printf("scanning bus %d for devices... ", i);
 105                 dev = usb_alloc_new_device(ctrl);
 106                 /*
 107                  * device 0 is always present
 108                  * (root hub, so let it analyze)
 109                  */
 110                 if (dev)
 111                         usb_new_device(dev);
 112
 113                 if (start_index == dev_index)
 114                         puts("No USB Device found\n");
 115                 else
 116                         printf("%d USB Device(s) found\n",
 117                                 dev_index - start_index);
 118
 119                 usb_started = 1;
 120         }
 121
 122         debug("scan end\n");
 123         /* if we were not able to find at least one working bus, bail out */
 124         if (!usb_started) {
 125                 puts("USB error: all controllers failed lowlevel init\n");
 126                 return -1;
 127         }
 128
 129         return 0;
 130 }
 131
 132 /******************************************************************************
 133  * Stop USB this stops the LowLevel Part and deregisters USB devices.
 134  */
 135 int usb_stop(void)
 136 {
 137         int i;
 138
 139         if (usb_started) {
 140                 asynch_allowed = 1;
 141                 usb_started = 0;
 142                 usb_hub_reset();
 143
 144                 for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
 145                         if (usb_lowlevel_stop(i))
 146                                 printf("failed to stop USB controller %d\n", i);
 147                 }
 148         }
 149
 150         return 0;
 151 }
 152
 153 /*
 154  * disables the asynch behaviour of the control message. This is used for data
 155  * transfers that uses the exclusiv access to the control and bulk messages.
 156  * Returns the old value so it can be restored later.
 157  */
 158 int usb_disable_asynch(int disable)
 159 {
 160         int old_value = asynch_allowed;
 161
 162         asynch_allowed = !disable;
 163         return old_value;
 164 }
 165
 166
 167 /*-------------------------------------------------------------------
 168  * Message wrappers.
 169  *
 170  */
 171
 172 /*
 173  * submits an Interrupt Message
 174  */
 175 int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
 176                         void *buffer, int transfer_len, int interval)
 177 {
 178         return submit_int_msg(dev, pipe, buffer, transfer_len, interval);
 179 }
 180
 181 /*
 182  * submits a control message and waits for comletion (at least timeout * 1ms)
 183  * If timeout is 0, we don't wait for completion (used as example to set and
 184  * clear keyboards LEDs). For data transfers, (storage transfers) we don't
 185  * allow control messages with 0 timeout, by previousely resetting the flag
 186  * asynch_allowed (usb_disable_asynch(1)).
 187  * returns the transfered length if OK or -1 if error. The transfered length
 188  * and the current status are stored in the dev->act_len and dev->status.
 189  */
 190 int usb_control_msg(struct usb_device *dev, unsigned int pipe,
 191                         unsigned char request, unsigned char requesttype,
 192                         unsigned short value, unsigned short index,
 193                         void *data, unsigned short size, int timeout)
 194 {
 195         ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
 196
 197         if ((timeout == 0) && (!asynch_allowed)) {
 198                 /* request for a asynch control pipe is not allowed */
 199                 return -1;
 200         }
 201
 202         /* set setup command */
 203         setup_packet->requesttype = requesttype;
 204         setup_packet->request = request;
 205         setup_packet->value = cpu_to_le16(value);
 206         setup_packet->index = cpu_to_le16(index);
 207         setup_packet->length = cpu_to_le16(size);
 208         debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
 209               "value 0x%X index 0x%X length 0x%X\n",
 210               request, requesttype, value, index, size);
 211         dev->status = USB_ST_NOT_PROC; /*not yet processed */
 212
 213         if (submit_control_msg(dev, pipe, data, size, setup_packet) < 0)
 214                 return -1;
 215         if (timeout == 0)
 216                 return (int)size;
 217
 218         /*
 219          * Wait for status to update until timeout expires, USB driver
 220          * interrupt handler may set the status when the USB operation has
 221          * been completed.
 222          */
 223         while (timeout--) {
 224                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 225                         break;
 226                 mdelay(1);
 227         }
 228         if (dev->status)
 229                 return -1;
 230
 231         return dev->act_len;
 232
 233 }
 234
 235 /*-------------------------------------------------------------------
 236  * submits bulk message, and waits for completion. returns 0 if Ok or
 237  * -1 if Error.
 238  * synchronous behavior
 239  */
 240 int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
 241                         void *data, int len, int *actual_length, int timeout)
 242 {
 243         if (len < 0)
 244                 return -1;
 245         dev->status = USB_ST_NOT_PROC; /*not yet processed */
 246         if (submit_bulk_msg(dev, pipe, data, len) < 0)
 247                 return -1;
 248         while (timeout--) {
 249                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
 250                         break;
 251                 mdelay(1);
 252         }
 253         *actual_length = dev->act_len;
 254         if (dev->status == 0)
 255                 return 0;
 256         else
 257                 return -1;
 258 }
 259
 260
 261 /*-------------------------------------------------------------------
 262  * Max Packet stuff
 263  */
 264
 265 /*
 266  * returns the max packet size, depending on the pipe direction and
 267  * the configurations values
 268  */
 269 int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
 270 {
 271         /* direction is out -> use emaxpacket out */
 272         if ((pipe & USB_DIR_IN) == 0)
 273                 return dev->epmaxpacketout[((pipe>>15) & 0xf)];
 274         else
 275                 return dev->epmaxpacketin[((pipe>>15) & 0xf)];
 276 }
 277
 278 /*
 279  * The routine usb_set_maxpacket_ep() is extracted from the loop of routine
 280  * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
 281  * when it is inlined in 1 single routine. What happens is that the register r3
 282  * is used as loop-count 'i', but gets overwritten later on.
 283  * This is clearly a compiler bug, but it is easier to workaround it here than
 284  * to update the compiler (Occurs with at least several GCC 4.{1,2},x
 285  * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
 286  *
 287  * NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
 288  */
 289 static void noinline
 290 usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
 291 {
 292         int b;
 293         struct usb_endpoint_descriptor *ep;
 294         u16 ep_wMaxPacketSize;
 295
 296         ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
 297
 298         b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 299         ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
 300
 301         if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 302                                                 USB_ENDPOINT_XFER_CONTROL) {
 303                 /* Control => bidirectional */
 304                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
 305                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
 306                 debug("##Control EP epmaxpacketout/in[%d] = %d\n",
 307                       b, dev->epmaxpacketin[b]);
 308         } else {
 309                 if ((ep->bEndpointAddress & 0x80) == 0) {
 310                         /* OUT Endpoint */
 311                         if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
 312                                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
 313                                 debug("##EP epmaxpacketout[%d] = %d\n",
 314                                       b, dev->epmaxpacketout[b]);
 315                         }
 316                 } else {
 317                         /* IN Endpoint */
 318                         if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
 319                                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
 320                                 debug("##EP epmaxpacketin[%d] = %d\n",
 321                                       b, dev->epmaxpacketin[b]);
 322                         }
 323                 } /* if out */
 324         } /* if control */
 325 }
 326
 327 /*
 328  * set the max packed value of all endpoints in the given configuration
 329  */
 330 static int usb_set_maxpacket(struct usb_device *dev)
 331 {
 332         int i, ii;
 333
 334         for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
 335                 for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
 336                         usb_set_maxpacket_ep(dev, i, ii);
 337
 338         return 0;
 339 }
 340
 341 /*******************************************************************************
 342  * Parse the config, located in buffer, and fills the dev->config structure.
 343  * Note that all little/big endian swapping are done automatically.
 344  */
 345 static int usb_parse_config(struct usb_device *dev,
 346                         unsigned char *buffer, int cfgno)
 347 {
 348         struct usb_descriptor_header *head;
 349         int index, ifno, epno, curr_if_num;
 350         u16 ep_wMaxPacketSize;
 351         struct usb_interface *if_desc = NULL;
 352
 353         ifno = -1;
 354         epno = -1;
 355         curr_if_num = -1;
 356
 357         dev->configno = cfgno;
 358         head = (struct usb_descriptor_header *) &buffer[0];
 359         if (head->bDescriptorType != USB_DT_CONFIG) {
 360                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
 361                         head->bDescriptorType);
 362                 return -1;
 363         }
 364         memcpy(&dev->config, buffer, buffer[0]);
 365         le16_to_cpus(&(dev->config.desc.wTotalLength));
 366         dev->config.no_of_if = 0;
 367
 368         index = dev->config.desc.bLength;
 369         /* Ok the first entry must be a configuration entry,
 370          * now process the others */
 371         head = (struct usb_descriptor_header *) &buffer[index];
 372         while (index + 1 < dev->config.desc.wTotalLength) {
 373                 switch (head->bDescriptorType) {
 374                 case USB_DT_INTERFACE:
 375                         if (((struct usb_interface_descriptor *) \
 376                              &buffer[index])->bInterfaceNumber != curr_if_num) {
 377                                 /* this is a new interface, copy new desc */
 378                                 ifno = dev->config.no_of_if;
 379                                 if_desc = &dev->config.if_desc[ifno];
 380                                 dev->config.no_of_if++;
 381                                 memcpy(if_desc, &buffer[index], buffer[index]);
 382                                 if_desc->no_of_ep = 0;
 383                                 if_desc->num_altsetting = 1;
 384                                 curr_if_num =
 385                                      if_desc->desc.bInterfaceNumber;
 386                         } else {
 387                                 /* found alternate setting for the interface */
 388                                 if (ifno >= 0) {
 389                                         if_desc = &dev->config.if_desc[ifno];
 390                                         if_desc->num_altsetting++;
 391                                 }
 392                         }
 393                         break;
 394                 case USB_DT_ENDPOINT:
 395                         epno = dev->config.if_desc[ifno].no_of_ep;
 396                         if_desc = &dev->config.if_desc[ifno];
 397                         /* found an endpoint */
 398                         if_desc->no_of_ep++;
 399                         memcpy(&if_desc->ep_desc[epno],
 400                                 &buffer[index], buffer[index]);
 401                         ep_wMaxPacketSize = get_unaligned(&dev->config.\
 402                                                         if_desc[ifno].\
 403                                                         ep_desc[epno].\
 404                                                         wMaxPacketSize);
 405                         put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
 406                                         &dev->config.\
 407                                         if_desc[ifno].\
 408                                         ep_desc[epno].\
 409                                         wMaxPacketSize);
 410                         debug("if %d, ep %d\n", ifno, epno);
 411                         break;
 412                 case USB_DT_SS_ENDPOINT_COMP:
 413                         if_desc = &dev->config.if_desc[ifno];
 414                         memcpy(&if_desc->ss_ep_comp_desc[epno],
 415                                 &buffer[index], buffer[index]);
 416                         break;
 417                 default:
 418                         if (head->bLength == 0)
 419                                 return 1;
 420
 421                         debug("unknown Description Type : %x\n",
 422                               head->bDescriptorType);
 423
 424 #ifdef DEBUG
 425                         {
 426                                 unsigned char *ch = (unsigned char *)head;
 427                                 int i;
 428
 429                                 for (i = 0; i < head->bLength; i++)
 430                                         debug("%02X ", *ch++);
 431                                 debug("\n\n\n");
 432                         }
 433 #endif
 434                         break;
 435                 }
 436                 index += head->bLength;
 437                 head = (struct usb_descriptor_header *)&buffer[index];
 438         }
 439         return 1;
 440 }
 441
 442 /***********************************************************************
 443  * Clears an endpoint
 444  * endp: endpoint number in bits 0-3;
 445  * direction flag in bit 7 (1 = IN, 0 = OUT)
 446  */
 447 int usb_clear_halt(struct usb_device *dev, int pipe)
 448 {
 449         int result;
 450         int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
 451
 452         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 453                                  USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
 454                                  endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
 455
 456         /* don't clear if failed */
 457         if (result < 0)
 458                 return result;
 459
 460         /*
 461          * NOTE: we do not get status and verify reset was successful
 462          * as some devices are reported to lock up upon this check..
 463          */
 464
 465         usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
 466
 467         /* toggle is reset on clear */
 468         usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
 469         return 0;
 470 }
 471
 472
 473 /**********************************************************************
 474  * get_descriptor type
 475  */
 476 static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
 477                         unsigned char index, void *buf, int size)
 478 {
 479         int res;
 480         res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 481                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 482                         (type << 8) + index, 0,
 483                         buf, size, USB_CNTL_TIMEOUT);
 484         return res;
 485 }
 486
 487 /**********************************************************************
 488  * gets configuration cfgno and store it in the buffer
 489  */
 490 int usb_get_configuration_no(struct usb_device *dev,
 491                              unsigned char *buffer, int cfgno)
 492 {
 493         int result;
 494         unsigned int tmp;
 495         struct usb_config_descriptor *config;
 496
 497         config = (struct usb_config_descriptor *)&buffer[0];
 498         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
 499         if (result < 9) {
 500                 if (result < 0)
 501                         printf("unable to get descriptor, error %lX\n",
 502                                 dev->status);
 503                 else
 504                         printf("config descriptor too short " \
 505                                 "(expected %i, got %i)\n", 9, result);
 506                 return -1;
 507         }
 508         tmp = le16_to_cpu(config->wTotalLength);
 509
 510         if (tmp > USB_BUFSIZ) {
 511                 printf("usb_get_configuration_no: failed to get " \
 512                        "descriptor - too long: %d\n", tmp);
 513                 return -1;
 514         }
 515
 516         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
 517         debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result, tmp);
 518         return result;
 519 }
 520
 521 /********************************************************************
 522  * set address of a device to the value in dev->devnum.
 523  * This can only be done by addressing the device via the default address (0)
 524  */
 525 static int usb_set_address(struct usb_device *dev)
 526 {
 527         int res;
 528
 529         debug("set address %d\n", dev->devnum);
 530         res = usb_control_msg(dev, usb_snddefctrl(dev),
 531                                 USB_REQ_SET_ADDRESS, 0,
 532                                 (dev->devnum), 0,
 533                                 NULL, 0, USB_CNTL_TIMEOUT);
 534         return res;
 535 }
 536
 537 /********************************************************************
 538  * set interface number to interface
 539  */
 540 int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 541 {
 542         struct usb_interface *if_face = NULL;
 543         int ret, i;
 544
 545         for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
 546                 if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
 547                         if_face = &dev->config.if_desc[i];
 548                         break;
 549                 }
 550         }
 551         if (!if_face) {
 552                 printf("selecting invalid interface %d", interface);
 553                 return -1;
 554         }
 555         /*
 556          * We should return now for devices with only one alternate setting.
 557          * According to 9.4.10 of the Universal Serial Bus Specification
 558          * Revision 2.0 such devices can return with a STALL. This results in
 559          * some USB sticks timeouting during initialization and then being
 560          * unusable in U-Boot.
 561          */
 562         if (if_face->num_altsetting == 1)
 563                 return 0;
 564
 565         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 566                                 USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
 567                                 alternate, interface, NULL, 0,
 568                                 USB_CNTL_TIMEOUT * 5);
 569         if (ret < 0)
 570                 return ret;
 571
 572         return 0;
 573 }
 574
 575 /********************************************************************
 576  * set configuration number to configuration
 577  */
 578 static int usb_set_configuration(struct usb_device *dev, int configuration)
 579 {
 580         int res;
 581         debug("set configuration %d\n", configuration);
 582         /* set setup command */
 583         res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 584                                 USB_REQ_SET_CONFIGURATION, 0,
 585                                 configuration, 0,
 586                                 NULL, 0, USB_CNTL_TIMEOUT);
 587         if (res == 0) {
 588                 dev->toggle[0] = 0;
 589                 dev->toggle[1] = 0;
 590                 return 0;
 591         } else
 592                 return -1;
 593 }
 594
 595 /********************************************************************
 596  * set protocol to protocol
 597  */
 598 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
 599 {
 600         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 601                 USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 602                 protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 603 }
 604
 605 /********************************************************************
 606  * set idle
 607  */
 608 int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
 609 {
 610         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 611                 USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 612                 (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
 613 }
 614
 615 /********************************************************************
 616  * get report
 617  */
 618 int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
 619                    unsigned char id, void *buf, int size)
 620 {
 621         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 622                         USB_REQ_GET_REPORT,
 623                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 624                         (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 625 }
 626
 627 /********************************************************************
 628  * get class descriptor
 629  */
 630 int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
 631                 unsigned char type, unsigned char id, void *buf, int size)
 632 {
 633         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 634                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 635                 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
 636 }
 637
 638 /********************************************************************
 639  * get string index in buffer
 640  */
 641 static int usb_get_string(struct usb_device *dev, unsigned short langid,
 642                    unsigned char index, void *buf, int size)
 643 {
 644         int i;
 645         int result;
 646
 647         for (i = 0; i < 3; ++i) {
 648                 /* some devices are flaky */
 649                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 650                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
 651                         (USB_DT_STRING << 8) + index, langid, buf, size,
 652                         USB_CNTL_TIMEOUT);
 653
 654                 if (result > 0)
 655                         break;
 656         }
 657
 658         return result;
 659 }
 660
 661
 662 static void usb_try_string_workarounds(unsigned char *buf, int *length)
 663 {
 664         int newlength, oldlength = *length;
 665
 666         for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
 667                 if (!isprint(buf[newlength]) || buf[newlength + 1])
 668                         break;
 669
 670         if (newlength > 2) {
 671                 buf[0] = newlength;
 672                 *length = newlength;
 673         }
 674 }
 675
 676
 677 static int usb_string_sub(struct usb_device *dev, unsigned int langid,
 678                 unsigned int index, unsigned char *buf)
 679 {
 680         int rc;
 681
 682         /* Try to read the string descriptor by asking for the maximum
 683          * possible number of bytes */
 684         rc = usb_get_string(dev, langid, index, buf, 255);
 685
 686         /* If that failed try to read the descriptor length, then
 687          * ask for just that many bytes */
 688         if (rc < 2) {
 689                 rc = usb_get_string(dev, langid, index, buf, 2);
 690                 if (rc == 2)
 691                         rc = usb_get_string(dev, langid, index, buf, buf[0]);
 692         }
 693
 694         if (rc >= 2) {
 695                 if (!buf[0] && !buf[1])
 696                         usb_try_string_workarounds(buf, &rc);
 697
 698                 /* There might be extra junk at the end of the descriptor */
 699                 if (buf[0] < rc)
 700                         rc = buf[0];
 701
 702                 rc = rc - (rc & 1); /* force a multiple of two */
 703         }
 704
 705         if (rc < 2)
 706                 rc = -1;
 707
 708         return rc;
 709 }
 710
 711
 712 /********************************************************************
 713  * usb_string:
 714  * Get string index and translate it to ascii.
 715  * returns string length (> 0) or error (< 0)
 716  */
 717 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 718 {
 719         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
 720         unsigned char *tbuf;
 721         int err;
 722         unsigned int u, idx;
 723
 724         if (size <= 0 || !buf || !index)
 725                 return -1;
 726         buf[0] = 0;
 727         tbuf = &mybuf[0];
 728
 729         /* get langid for strings if it's not yet known */
 730         if (!dev->have_langid) {
 731                 err = usb_string_sub(dev, 0, 0, tbuf);
 732                 if (err < 0) {
 733                         debug("error getting string descriptor 0 " \
 734                               "(error=%lx)\n", dev->status);
 735                         return -1;
 736                 } else if (tbuf[0] < 4) {
 737                         debug("string descriptor 0 too short\n");
 738                         return -1;
 739                 } else {
 740                         dev->have_langid = -1;
 741                         dev->string_langid = tbuf[2] | (tbuf[3] << 8);
 742                                 /* always use the first langid listed */
 743                         debug("USB device number %d default " \
 744                               "language ID 0x%x\n",
 745                               dev->devnum, dev->string_langid);
 746                 }
 747         }
 748
 749         err = usb_string_sub(dev, dev->string_langid, index, tbuf);
 750         if (err < 0)
 751                 return err;
 752
 753         size--;         /* leave room for trailing NULL char in output buffer */
 754         for (idx = 0, u = 2; u < err; u += 2) {
 755                 if (idx >= size)
 756                         break;
 757                 if (tbuf[u+1])                  /* high byte */
 758                         buf[idx++] = '?';  /* non-ASCII character */
 759                 else
 760                         buf[idx++] = tbuf[u];
 761         }
 762         buf[idx] = 0;
 763         err = idx;
 764         return err;
 765 }
 766
 767
 768 /********************************************************************
 769  * USB device handling:
 770  * the USB device are static allocated [USB_MAX_DEVICE].
 771  */
 772
 773
 774 /* returns a pointer to the device with the index [index].
 775  * if the device is not assigned (dev->devnum==-1) returns NULL
 776  */
 777 struct usb_device *usb_get_dev_index(int index)
 778 {
 779         if (usb_dev[index].devnum == -1)
 780                 return NULL;
 781         else
 782                 return &usb_dev[index];
 783 }
 784
 785 /* returns a pointer of a new device structure or NULL, if
 786  * no device struct is available
 787  */
 788 struct usb_device *usb_alloc_new_device(void *controller)
 789 {
 790         int i;
 791         debug("New Device %d\n", dev_index);
 792         if (dev_index == USB_MAX_DEVICE) {
 793                 printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
 794                 return NULL;
 795         }
 796         /* default Address is 0, real addresses start with 1 */
 797         usb_dev[dev_index].devnum = dev_index + 1;
 798         usb_dev[dev_index].maxchild = 0;
 799         for (i = 0; i < USB_MAXCHILDREN; i++)
 800                 usb_dev[dev_index].children[i] = NULL;
 801         usb_dev[dev_index].parent = NULL;
 802         usb_dev[dev_index].controller = controller;
 803         dev_index++;
 804         return &usb_dev[dev_index - 1];
 805 }
 806
 807 /*
 808  * Free the newly created device node.
 809  * Called in error cases where configuring a newly attached
 810  * device fails for some reason.
 811  */
 812 void usb_free_device(void)
 813 {
 814         dev_index--;
 815         debug("Freeing device node: %d\n", dev_index);
 816         memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
 817         usb_dev[dev_index].devnum = -1;
 818 }
 819
 820 /*
 821  * By the time we get here, the device has gotten a new device ID
 822  * and is in the default state. We need to identify the thing and
 823  * get the ball rolling..
 824  *
 825  * Returns 0 for success, != 0 for error.
 826  */
 827 int usb_new_device(struct usb_device *dev)
 828 {
 829         int addr, err;
 830         int tmp;
 831         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
 832
 833         /* We still haven't set the Address yet */
 834         addr = dev->devnum;
 835         dev->devnum = 0;
 836
 837 #ifdef CONFIG_LEGACY_USB_INIT_SEQ
 838         /* this is the old and known way of initializing devices, it is
 839          * different than what Windows and Linux are doing. Windows and Linux
 840          * both retrieve 64 bytes while reading the device descriptor
 841          * Several USB stick devices report ERR: CTL_TIMEOUT, caused by an
 842          * invalid header while reading 8 bytes as device descriptor. */
 843         dev->descriptor.bMaxPacketSize0 = 8;        /* Start off at 8 bytes  */
 844         dev->maxpacketsize = PACKET_SIZE_8;
 845         dev->epmaxpacketin[0] = 8;
 846         dev->epmaxpacketout[0] = 8;
 847
 848         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, tmpbuf, 8);
 849         if (err < 8) {
 850                 printf("\n      USB device not responding, " \
 851                        "giving up (status=%lX)\n", dev->status);
 852                 return 1;
 853         }
 854         memcpy(&dev->descriptor, tmpbuf, 8);
 855 #else
 856         /* This is a Windows scheme of initialization sequence, with double
 857          * reset of the device (Linux uses the same sequence)
 858          * Some equipment is said to work only with such init sequence; this
 859          * patch is based on the work by Alan Stern:
 860          * http://sourceforge.net/mailarchive/forum.php?
 861          * thread_id=5729457&forum_id=5398
 862          */
 863         struct usb_device_descriptor *desc;
 864         int port = -1;
 865         struct usb_device *parent = dev->parent;
 866         unsigned short portstatus;
 867
 868         /* send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
 869          * only 18 bytes long, this will terminate with a short packet.  But if
 870          * the maxpacket size is 8 or 16 the device may be waiting to transmit
 871          * some more, or keeps on retransmitting the 8 byte header. */
 872
 873         desc = (struct usb_device_descriptor *)tmpbuf;
 874         dev->descriptor.bMaxPacketSize0 = 64;       /* Start off at 64 bytes  */
 875         /* Default to 64 byte max packet size */
 876         dev->maxpacketsize = PACKET_SIZE_64;
 877         dev->epmaxpacketin[0] = 64;
 878         dev->epmaxpacketout[0] = 64;
 879
 880         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
 881         if (err < 0) {
 882                 debug("usb_new_device: usb_get_descriptor() failed\n");
 883                 return 1;
 884         }
 885
 886         dev->descriptor.bMaxPacketSize0 = desc->bMaxPacketSize0;
 887         /*
 888          * Fetch the device class, driver can use this info
 889          * to differentiate between HUB and DEVICE.
 890          */
 891         dev->descriptor.bDeviceClass = desc->bDeviceClass;
 892
 893         /* find the port number we're at */
 894         if (parent) {
 895                 int j;
 896
 897                 for (j = 0; j < parent->maxchild; j++) {
 898                         if (parent->children[j] == dev) {
 899                                 port = j;
 900                                 break;
 901                         }
 902                 }
 903                 if (port < 0) {
 904                         printf("usb_new_device:cannot locate device's port.\n");
 905                         return 1;
 906                 }
 907
 908                 /* reset the port for the second time */
 909                 err = hub_port_reset(dev->parent, port, &portstatus);
 910                 if (err < 0) {
 911                         printf("\n     Couldn't reset port %i\n", port);
 912                         return 1;
 913                 }
 914         }
 915 #endif
 916
 917         dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
 918         dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
 919         switch (dev->descriptor.bMaxPacketSize0) {
 920         case 8:
 921                 dev->maxpacketsize  = PACKET_SIZE_8;
 922                 break;
 923         case 16:
 924                 dev->maxpacketsize = PACKET_SIZE_16;
 925                 break;
 926         case 32:
 927                 dev->maxpacketsize = PACKET_SIZE_32;
 928                 break;
 929         case 64:
 930                 dev->maxpacketsize = PACKET_SIZE_64;
 931                 break;
 932         }
 933         dev->devnum = addr;
 934
 935         err = usb_set_address(dev); /* set address */
 936
 937         if (err < 0) {
 938                 printf("\n      USB device not accepting new address " \
 939                         "(error=%lX)\n", dev->status);
 940                 return 1;
 941         }
 942
 943         mdelay(10);     /* Let the SET_ADDRESS settle */
 944
 945         tmp = sizeof(dev->descriptor);
 946
 947         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 948                                  tmpbuf, sizeof(dev->descriptor));
 949         if (err < tmp) {
 950                 if (err < 0)
 951                         printf("unable to get device descriptor (error=%d)\n",
 952                                err);
 953                 else
 954                         printf("USB device descriptor short read " \
 955                                 "(expected %i, got %i)\n", tmp, err);
 956                 return 1;
 957         }
 958         memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));
 959         /* correct le values */
 960         le16_to_cpus(&dev->descriptor.bcdUSB);
 961         le16_to_cpus(&dev->descriptor.idVendor);
 962         le16_to_cpus(&dev->descriptor.idProduct);
 963         le16_to_cpus(&dev->descriptor.bcdDevice);
 964         /* only support for one config for now */
 965         err = usb_get_configuration_no(dev, tmpbuf, 0);
 966         if (err < 0) {
 967                 printf("usb_new_device: Cannot read configuration, " \
 968                        "skipping device %04x:%04x\n",
 969                        dev->descriptor.idVendor, dev->descriptor.idProduct);
 970                 return -1;
 971         }
 972         usb_parse_config(dev, tmpbuf, 0);
 973         usb_set_maxpacket(dev);
 974         /* we set the default configuration here */
 975         if (usb_set_configuration(dev, dev->config.desc.bConfigurationValue)) {
 976                 printf("failed to set default configuration " \
 977                         "len %d, status %lX\n", dev->act_len, dev->status);
 978                 return -1;
 979         }
 980         debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
 981               dev->descriptor.iManufacturer, dev->descriptor.iProduct,
 982               dev->descriptor.iSerialNumber);
 983         memset(dev->mf, 0, sizeof(dev->mf));
 984         memset(dev->prod, 0, sizeof(dev->prod));
 985         memset(dev->serial, 0, sizeof(dev->serial));
 986         if (dev->descriptor.iManufacturer)
 987                 usb_string(dev, dev->descriptor.iManufacturer,
 988                            dev->mf, sizeof(dev->mf));
 989         if (dev->descriptor.iProduct)
 990                 usb_string(dev, dev->descriptor.iProduct,
 991                            dev->prod, sizeof(dev->prod));
 992         if (dev->descriptor.iSerialNumber)
 993                 usb_string(dev, dev->descriptor.iSerialNumber,
 994                            dev->serial, sizeof(dev->serial));
 995         debug("Manufacturer %s\n", dev->mf);
 996         debug("Product      %s\n", dev->prod);
 997         debug("SerialNumber %s\n", dev->serial);
 998         /* now prode if the device is a hub */
 999         usb_hub_probe(dev, 0);
1000         return 0;
1001 }
1002
1003 /* EOF */