1 /* 2 * storage_common.c -- Common definitions for mass storage functionality 3 * 4 * Copyright (C) 2003-2008 Alan Stern 5 * Copyeight (C) 2009 Samsung Electronics 6 * Author: Michal Nazarewicz (m.nazarewicz@samsung.com) 7 * 8 * Ported to u-boot: 9 * Andrzej Pietrasiewicz <andrzej.p@samsung.com> 10 * 11 * Code refactoring & cleanup: 12 * Łukasz Majewski <l.majewski@samsung.com> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 27 */ 28 29 30 /* 31 * This file requires the following identifiers used in USB strings to 32 * be defined (each of type pointer to char): 33 * - fsg_string_manufacturer -- name of the manufacturer 34 * - fsg_string_product -- name of the product 35 * - fsg_string_serial -- product's serial 36 * - fsg_string_config -- name of the configuration 37 * - fsg_string_interface -- name of the interface 38 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS 39 * macro is defined prior to including this file. 40 */ 41 42 /* 43 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and 44 * fsg_hs_intr_in_desc objects as well as 45 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES 46 * macros are not defined. 47 * 48 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER, 49 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not 50 * defined (as well as corresponding entries in string tables are 51 * missing) and FSG_STRING_INTERFACE has value of zero. 52 * 53 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined. 54 */ 55 56 /* 57 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included 58 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN 59 * characters rather then a pointer to void. 60 */ 61 62 63 /* #include <asm/unaligned.h> */ 64 65 66 /* 67 * Thanks to NetChip Technologies for donating this product ID. 68 * 69 * DO NOT REUSE THESE IDs with any other driver!! Ever!! 70 * Instead: allocate your own, using normal USB-IF procedures. 71 */ 72 #define FSG_VENDOR_ID 0x0525 /* NetChip */ 73 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ 74 75 /*-------------------------------------------------------------------------*/ 76 77 #ifndef DEBUG 78 #undef VERBOSE_DEBUG 79 #undef DUMP_MSGS 80 #endif /* !DEBUG */ 81 82 #ifdef VERBOSE_DEBUG 83 #define VLDBG LDBG 84 #else 85 #define VLDBG(lun, fmt, args...) do { } while (0) 86 #endif /* VERBOSE_DEBUG */ 87 88 /* 89 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) 90 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) 91 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) 92 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) 93 */ 94 95 #define LDBG(lun, fmt, args...) do { } while (0) 96 #define LERROR(lun, fmt, args...) do { } while (0) 97 #define LWARN(lun, fmt, args...) do { } while (0) 98 #define LINFO(lun, fmt, args...) do { } while (0) 99 100 /* 101 * Keep those macros in sync with those in 102 * include/linux/usb/composite.h or else GCC will complain. If they 103 * are identical (the same names of arguments, white spaces in the 104 * same places) GCC will allow redefinition otherwise (even if some 105 * white space is removed or added) warning will be issued. 106 * 107 * Those macros are needed here because File Storage Gadget does not 108 * include the composite.h header. For composite gadgets those macros 109 * are redundant since composite.h is included any way. 110 * 111 * One could check whether those macros are already defined (which 112 * would indicate composite.h had been included) or not (which would 113 * indicate we were in FSG) but this is not done because a warning is 114 * desired if definitions here differ from the ones in composite.h. 115 * 116 * We want the definitions to match and be the same in File Storage 117 * Gadget as well as Mass Storage Function (and so composite gadgets 118 * using MSF). If someone changes them in composite.h it will produce 119 * a warning in this file when building MSF. 120 */ 121 122 #define DBG(d, fmt, args...) debug(fmt , ## args) 123 #define VDBG(d, fmt, args...) debug(fmt , ## args) 124 /* #define ERROR(d, fmt, args...) printf(fmt , ## args) */ 125 /* #define WARNING(d, fmt, args...) printf(fmt , ## args) */ 126 /* #define INFO(d, fmt, args...) printf(fmt , ## args) */ 127 128 /* #define DBG(d, fmt, args...) do { } while (0) */ 129 /* #define VDBG(d, fmt, args...) do { } while (0) */ 130 #define ERROR(d, fmt, args...) do { } while (0) 131 #define WARNING(d, fmt, args...) do { } while (0) 132 #define INFO(d, fmt, args...) do { } while (0) 133 134 #ifdef DUMP_MSGS 135 136 /* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */ 137 # define dump_msg(fsg, label, buf, length) do { \ 138 if (length < 512) { \ 139 DBG(fsg, "%s, length %u:\n", label, length); \ 140 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \ 141 16, 1, buf, length, 0); \ 142 } \ 143 } while (0) 144 145 # define dump_cdb(fsg) do { } while (0) 146 147 #else 148 149 # define dump_msg(fsg, /* const char * */ label, \ 150 /* const u8 * */ buf, /* unsigned */ length) do { } while (0) 151 152 # ifdef VERBOSE_DEBUG 153 154 # define dump_cdb(fsg) \ 155 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \ 156 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \ 157 158 # else 159 160 # define dump_cdb(fsg) do { } while (0) 161 162 # endif /* VERBOSE_DEBUG */ 163 164 #endif /* DUMP_MSGS */ 165 166 /*-------------------------------------------------------------------------*/ 167 168 /* SCSI device types */ 169 #define TYPE_DISK 0x00 170 #define TYPE_CDROM 0x05 171 172 /* USB protocol value = the transport method */ 173 #define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */ 174 #define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */ 175 #define USB_PR_BULK 0x50 /* Bulk-only */ 176 177 /* USB subclass value = the protocol encapsulation */ 178 #define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */ 179 #define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */ 180 #define USB_SC_QIC 0x03 /* QIC-157 (tape) */ 181 #define USB_SC_UFI 0x04 /* UFI (floppy) */ 182 #define USB_SC_8070 0x05 /* SFF-8070i (removable) */ 183 #define USB_SC_SCSI 0x06 /* Transparent SCSI */ 184 185 /* Bulk-only data structures */ 186 187 /* Command Block Wrapper */ 188 struct fsg_bulk_cb_wrap { 189 __le32 Signature; /* Contains 'USBC' */ 190 u32 Tag; /* Unique per command id */ 191 __le32 DataTransferLength; /* Size of the data */ 192 u8 Flags; /* Direction in bit 7 */ 193 u8 Lun; /* LUN (normally 0) */ 194 u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */ 195 u8 CDB[16]; /* Command Data Block */ 196 }; 197 198 #define USB_BULK_CB_WRAP_LEN 31 199 #define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */ 200 #define USB_BULK_IN_FLAG 0x80 201 202 /* Command Status Wrapper */ 203 struct bulk_cs_wrap { 204 __le32 Signature; /* Should = 'USBS' */ 205 u32 Tag; /* Same as original command */ 206 __le32 Residue; /* Amount not transferred */ 207 u8 Status; /* See below */ 208 }; 209 210 #define USB_BULK_CS_WRAP_LEN 13 211 #define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */ 212 #define USB_STATUS_PASS 0 213 #define USB_STATUS_FAIL 1 214 #define USB_STATUS_PHASE_ERROR 2 215 216 /* Bulk-only class specific requests */ 217 #define USB_BULK_RESET_REQUEST 0xff 218 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe 219 220 /* CBI Interrupt data structure */ 221 struct interrupt_data { 222 u8 bType; 223 u8 bValue; 224 }; 225 226 #define CBI_INTERRUPT_DATA_LEN 2 227 228 /* CBI Accept Device-Specific Command request */ 229 #define USB_CBI_ADSC_REQUEST 0x00 230 231 /* Length of a SCSI Command Data Block */ 232 #define MAX_COMMAND_SIZE 16 233 234 /* SCSI commands that we recognize */ 235 #define SC_FORMAT_UNIT 0x04 236 #define SC_INQUIRY 0x12 237 #define SC_MODE_SELECT_6 0x15 238 #define SC_MODE_SELECT_10 0x55 239 #define SC_MODE_SENSE_6 0x1a 240 #define SC_MODE_SENSE_10 0x5a 241 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e 242 #define SC_READ_6 0x08 243 #define SC_READ_10 0x28 244 #define SC_READ_12 0xa8 245 #define SC_READ_CAPACITY 0x25 246 #define SC_READ_FORMAT_CAPACITIES 0x23 247 #define SC_READ_HEADER 0x44 248 #define SC_READ_TOC 0x43 249 #define SC_RELEASE 0x17 250 #define SC_REQUEST_SENSE 0x03 251 #define SC_RESERVE 0x16 252 #define SC_SEND_DIAGNOSTIC 0x1d 253 #define SC_START_STOP_UNIT 0x1b 254 #define SC_SYNCHRONIZE_CACHE 0x35 255 #define SC_TEST_UNIT_READY 0x00 256 #define SC_VERIFY 0x2f 257 #define SC_WRITE_6 0x0a 258 #define SC_WRITE_10 0x2a 259 #define SC_WRITE_12 0xaa 260 261 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ 262 #define SS_NO_SENSE 0 263 #define SS_COMMUNICATION_FAILURE 0x040800 264 #define SS_INVALID_COMMAND 0x052000 265 #define SS_INVALID_FIELD_IN_CDB 0x052400 266 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 267 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 268 #define SS_MEDIUM_NOT_PRESENT 0x023a00 269 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 270 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 271 #define SS_RESET_OCCURRED 0x062900 272 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 273 #define SS_UNRECOVERED_READ_ERROR 0x031100 274 #define SS_WRITE_ERROR 0x030c02 275 #define SS_WRITE_PROTECTED 0x072700 276 277 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */ 278 #define ASC(x) ((u8) ((x) >> 8)) 279 #define ASCQ(x) ((u8) (x)) 280 281 struct device_attribute { int i; }; 282 struct rw_semaphore { int i; }; 283 #define down_write(...) do { } while (0) 284 #define up_write(...) do { } while (0) 285 #define down_read(...) do { } while (0) 286 #define up_read(...) do { } while (0) 287 #define ETOOSMALL 525 288 289 #include <usb_mass_storage.h> 290 extern struct ums_board_info *ums_info; 291 292 /*-------------------------------------------------------------------------*/ 293 294 struct fsg_lun { 295 loff_t file_length; 296 loff_t num_sectors; 297 298 unsigned int initially_ro:1; 299 unsigned int ro:1; 300 unsigned int removable:1; 301 unsigned int cdrom:1; 302 unsigned int prevent_medium_removal:1; 303 unsigned int registered:1; 304 unsigned int info_valid:1; 305 unsigned int nofua:1; 306 307 u32 sense_data; 308 u32 sense_data_info; 309 u32 unit_attention_data; 310 311 struct device dev; 312 }; 313 314 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL) 315 #if 0 316 static struct fsg_lun *fsg_lun_from_dev(struct device *dev) 317 { 318 return container_of(dev, struct fsg_lun, dev); 319 } 320 #endif 321 322 /* Big enough to hold our biggest descriptor */ 323 #define EP0_BUFSIZE 256 324 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ 325 326 /* Number of buffers we will use. 2 is enough for double-buffering */ 327 #define FSG_NUM_BUFFERS 2 328 329 /* Default size of buffer length. */ 330 #define FSG_BUFLEN ((u32)16384) 331 332 /* Maximal number of LUNs supported in mass storage function */ 333 #define FSG_MAX_LUNS 8 334 335 enum fsg_buffer_state { 336 BUF_STATE_EMPTY = 0, 337 BUF_STATE_FULL, 338 BUF_STATE_BUSY 339 }; 340 341 struct fsg_buffhd { 342 #ifdef FSG_BUFFHD_STATIC_BUFFER 343 char buf[FSG_BUFLEN]; 344 #else 345 void *buf; 346 #endif 347 enum fsg_buffer_state state; 348 struct fsg_buffhd *next; 349 350 /* 351 * The NetChip 2280 is faster, and handles some protocol faults 352 * better, if we don't submit any short bulk-out read requests. 353 * So we will record the intended request length here. 354 */ 355 unsigned int bulk_out_intended_length; 356 357 struct usb_request *inreq; 358 int inreq_busy; 359 struct usb_request *outreq; 360 int outreq_busy; 361 }; 362 363 enum fsg_state { 364 /* This one isn't used anywhere */ 365 FSG_STATE_COMMAND_PHASE = -10, 366 FSG_STATE_DATA_PHASE, 367 FSG_STATE_STATUS_PHASE, 368 369 FSG_STATE_IDLE = 0, 370 FSG_STATE_ABORT_BULK_OUT, 371 FSG_STATE_RESET, 372 FSG_STATE_INTERFACE_CHANGE, 373 FSG_STATE_CONFIG_CHANGE, 374 FSG_STATE_DISCONNECT, 375 FSG_STATE_EXIT, 376 FSG_STATE_TERMINATED 377 }; 378 379 enum data_direction { 380 DATA_DIR_UNKNOWN = 0, 381 DATA_DIR_FROM_HOST, 382 DATA_DIR_TO_HOST, 383 DATA_DIR_NONE 384 }; 385 386 /*-------------------------------------------------------------------------*/ 387 388 static inline u32 get_unaligned_be24(u8 *buf) 389 { 390 return 0xffffff & (u32) get_unaligned_be32(buf - 1); 391 } 392 393 /*-------------------------------------------------------------------------*/ 394 395 enum { 396 #ifndef FSG_NO_DEVICE_STRINGS 397 FSG_STRING_MANUFACTURER = 1, 398 FSG_STRING_PRODUCT, 399 FSG_STRING_SERIAL, 400 FSG_STRING_CONFIG, 401 #endif 402 FSG_STRING_INTERFACE 403 }; 404 405 #ifndef FSG_NO_OTG 406 static struct usb_otg_descriptor 407 fsg_otg_desc = { 408 .bLength = sizeof fsg_otg_desc, 409 .bDescriptorType = USB_DT_OTG, 410 411 .bmAttributes = USB_OTG_SRP, 412 }; 413 #endif 414 415 /* There is only one interface. */ 416 417 static struct usb_interface_descriptor 418 fsg_intf_desc = { 419 .bLength = sizeof fsg_intf_desc, 420 .bDescriptorType = USB_DT_INTERFACE, 421 422 .bNumEndpoints = 2, /* Adjusted during fsg_bind() */ 423 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 424 .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ 425 .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ 426 .iInterface = FSG_STRING_INTERFACE, 427 }; 428 429 /* 430 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and 431 * interrupt-in. 432 */ 433 434 static struct usb_endpoint_descriptor 435 fsg_fs_bulk_in_desc = { 436 .bLength = USB_DT_ENDPOINT_SIZE, 437 .bDescriptorType = USB_DT_ENDPOINT, 438 439 .bEndpointAddress = USB_DIR_IN, 440 .bmAttributes = USB_ENDPOINT_XFER_BULK, 441 /* wMaxPacketSize set by autoconfiguration */ 442 }; 443 444 static struct usb_endpoint_descriptor 445 fsg_fs_bulk_out_desc = { 446 .bLength = USB_DT_ENDPOINT_SIZE, 447 .bDescriptorType = USB_DT_ENDPOINT, 448 449 .bEndpointAddress = USB_DIR_OUT, 450 .bmAttributes = USB_ENDPOINT_XFER_BULK, 451 /* wMaxPacketSize set by autoconfiguration */ 452 }; 453 454 #ifndef FSG_NO_INTR_EP 455 456 static struct usb_endpoint_descriptor 457 fsg_fs_intr_in_desc = { 458 .bLength = USB_DT_ENDPOINT_SIZE, 459 .bDescriptorType = USB_DT_ENDPOINT, 460 461 .bEndpointAddress = USB_DIR_IN, 462 .bmAttributes = USB_ENDPOINT_XFER_INT, 463 .wMaxPacketSize = cpu_to_le16(2), 464 .bInterval = 32, /* frames -> 32 ms */ 465 }; 466 467 #ifndef FSG_NO_OTG 468 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2 469 #else 470 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1 471 #endif 472 473 #endif 474 475 static struct usb_descriptor_header *fsg_fs_function[] = { 476 #ifndef FSG_NO_OTG 477 (struct usb_descriptor_header *) &fsg_otg_desc, 478 #endif 479 (struct usb_descriptor_header *) &fsg_intf_desc, 480 (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, 481 (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, 482 #ifndef FSG_NO_INTR_EP 483 (struct usb_descriptor_header *) &fsg_fs_intr_in_desc, 484 #endif 485 NULL, 486 }; 487 488 /* 489 * USB 2.0 devices need to expose both high speed and full speed 490 * descriptors, unless they only run at full speed. 491 * 492 * That means alternate endpoint descriptors (bigger packets) 493 * and a "device qualifier" ... plus more construction options 494 * for the configuration descriptor. 495 */ 496 static struct usb_endpoint_descriptor 497 fsg_hs_bulk_in_desc = { 498 .bLength = USB_DT_ENDPOINT_SIZE, 499 .bDescriptorType = USB_DT_ENDPOINT, 500 501 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ 502 .bmAttributes = USB_ENDPOINT_XFER_BULK, 503 .wMaxPacketSize = cpu_to_le16(512), 504 }; 505 506 static struct usb_endpoint_descriptor 507 fsg_hs_bulk_out_desc = { 508 .bLength = USB_DT_ENDPOINT_SIZE, 509 .bDescriptorType = USB_DT_ENDPOINT, 510 511 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ 512 .bmAttributes = USB_ENDPOINT_XFER_BULK, 513 .wMaxPacketSize = cpu_to_le16(512), 514 .bInterval = 1, /* NAK every 1 uframe */ 515 }; 516 517 #ifndef FSG_NO_INTR_EP 518 519 static struct usb_endpoint_descriptor 520 fsg_hs_intr_in_desc = { 521 .bLength = USB_DT_ENDPOINT_SIZE, 522 .bDescriptorType = USB_DT_ENDPOINT, 523 524 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ 525 .bmAttributes = USB_ENDPOINT_XFER_INT, 526 .wMaxPacketSize = cpu_to_le16(2), 527 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */ 528 }; 529 530 #ifndef FSG_NO_OTG 531 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2 532 #else 533 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1 534 #endif 535 536 #endif 537 538 static struct usb_descriptor_header *fsg_hs_function[] = { 539 #ifndef FSG_NO_OTG 540 (struct usb_descriptor_header *) &fsg_otg_desc, 541 #endif 542 (struct usb_descriptor_header *) &fsg_intf_desc, 543 (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, 544 (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, 545 #ifndef FSG_NO_INTR_EP 546 (struct usb_descriptor_header *) &fsg_hs_intr_in_desc, 547 #endif 548 NULL, 549 }; 550 551 /* Maxpacket and other transfer characteristics vary by speed. */ 552 static struct usb_endpoint_descriptor * 553 fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, 554 struct usb_endpoint_descriptor *hs) 555 { 556 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) 557 return hs; 558 return fs; 559 } 560 561 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ 562 static struct usb_string fsg_strings[] = { 563 #ifndef FSG_NO_DEVICE_STRINGS 564 {FSG_STRING_MANUFACTURER, fsg_string_manufacturer}, 565 {FSG_STRING_PRODUCT, fsg_string_product}, 566 {FSG_STRING_SERIAL, fsg_string_serial}, 567 {FSG_STRING_CONFIG, fsg_string_config}, 568 #endif 569 {FSG_STRING_INTERFACE, fsg_string_interface}, 570 {} 571 }; 572 573 static struct usb_gadget_strings fsg_stringtab = { 574 .language = 0x0409, /* en-us */ 575 .strings = fsg_strings, 576 }; 577 578 /*-------------------------------------------------------------------------*/ 579 580 /* 581 * If the next two routines are called while the gadget is registered, 582 * the caller must own fsg->filesem for writing. 583 */ 584 585 static int fsg_lun_open(struct fsg_lun *curlun, const char *filename) 586 { 587 int ro; 588 int rc = -EINVAL; 589 loff_t size; 590 loff_t num_sectors; 591 loff_t min_sectors; 592 593 /* R/W if we can, R/O if we must */ 594 ro = curlun->initially_ro; 595 596 ums_info->get_capacity(&(ums_info->ums_dev), &size); 597 if (size < 0) { 598 printf("unable to find file size: %s\n", filename); 599 rc = (int) size; 600 goto out; 601 } 602 num_sectors = size >> 9; /* File size in 512-byte blocks */ 603 min_sectors = 1; 604 if (num_sectors < min_sectors) { 605 printf("file too small: %s\n", filename); 606 rc = -ETOOSMALL; 607 goto out; 608 } 609 610 curlun->ro = ro; 611 curlun->file_length = size; 612 curlun->num_sectors = num_sectors; 613 debug("open backing file: %s\n", filename); 614 rc = 0; 615 616 out: 617 return rc; 618 } 619 620 static void fsg_lun_close(struct fsg_lun *curlun) 621 { 622 } 623 624 /*-------------------------------------------------------------------------*/ 625 626 /* 627 * Sync the file data, don't bother with the metadata. 628 * This code was copied from fs/buffer.c:sys_fdatasync(). 629 */ 630 static int fsg_lun_fsync_sub(struct fsg_lun *curlun) 631 { 632 return 0; 633 } 634 635 static void store_cdrom_address(u8 *dest, int msf, u32 addr) 636 { 637 if (msf) { 638 /* Convert to Minutes-Seconds-Frames */ 639 addr >>= 2; /* Convert to 2048-byte frames */ 640 addr += 2*75; /* Lead-in occupies 2 seconds */ 641 dest[3] = addr % 75; /* Frames */ 642 addr /= 75; 643 dest[2] = addr % 60; /* Seconds */ 644 addr /= 60; 645 dest[1] = addr; /* Minutes */ 646 dest[0] = 0; /* Reserved */ 647 } else { 648 /* Absolute sector */ 649 put_unaligned_be32(addr, dest); 650 } 651 } 652 653 /*-------------------------------------------------------------------------*/ 654