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