drivers/ide/ide-floppy.c

   1 /*
   2  * IDE ATAPI floppy driver.
   3  *
   4  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   5  * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
   6  * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
   7  *
   8  * This driver supports the following IDE floppy drives:
   9  *
  10  * LS-120/240 SuperDisk
  11  * Iomega Zip 100/250
  12  * Iomega PC Card Clik!/PocketZip
  13  *
  14  * For a historical changelog see
  15  * Documentation/ide/ChangeLog.ide-floppy.1996-2002
  16  */
  17
  18 #define DRV_NAME "ide-floppy"
  19 #define PFX DRV_NAME ": "
  20
  21 #define IDEFLOPPY_VERSION "1.00"
  22
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/string.h>
  26 #include <linux/kernel.h>
  27 #include <linux/delay.h>
  28 #include <linux/timer.h>
  29 #include <linux/mm.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/major.h>
  32 #include <linux/errno.h>
  33 #include <linux/genhd.h>
  34 #include <linux/slab.h>
  35 #include <linux/cdrom.h>
  36 #include <linux/ide.h>
  37 #include <linux/hdreg.h>
  38 #include <linux/bitops.h>
  39 #include <linux/mutex.h>
  40 #include <linux/scatterlist.h>
  41
  42 #include <scsi/scsi_ioctl.h>
  43
  44 #include <asm/byteorder.h>
  45 #include <linux/irq.h>
  46 #include <linux/uaccess.h>
  47 #include <linux/io.h>
  48 #include <asm/unaligned.h>
  49
  50 #include "ide-floppy.h"
  51
  52 /* define to see debug info */
  53 #define IDEFLOPPY_DEBUG_LOG     0
  54
  55 #if IDEFLOPPY_DEBUG_LOG
  56 #define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
  57 #else
  58 #define ide_debug_log(lvl, fmt, args...) do {} while (0)
  59 #endif
  60
  61 /*
  62  * After each failed packet command we issue a request sense command and retry
  63  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  64  */
  65 #define IDEFLOPPY_MAX_PC_RETRIES        3
  66
  67 /* format capacities descriptor codes */
  68 #define CAPACITY_INVALID        0x00
  69 #define CAPACITY_UNFORMATTED    0x01
  70 #define CAPACITY_CURRENT        0x02
  71 #define CAPACITY_NO_CARTRIDGE   0x03
  72
  73 /*
  74  * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
  75  * was apparently being deasserted before the unit was ready to receive data.
  76  */
  77 #define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */
  78
  79 /* Error code returned in rq->errors to the higher part of the driver. */
  80 #define IDEFLOPPY_ERROR_GENERAL         101
  81
  82 static DEFINE_MUTEX(idefloppy_ref_mutex);
  83
  84 static void idefloppy_cleanup_obj(struct kref *);
  85
  86 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
  87 {
  88         struct ide_floppy_obj *floppy = NULL;
  89
  90         mutex_lock(&idefloppy_ref_mutex);
  91         floppy = ide_drv_g(disk, ide_floppy_obj);
  92         if (floppy) {
  93                 if (ide_device_get(floppy->drive))
  94                         floppy = NULL;
  95                 else
  96                         kref_get(&floppy->kref);
  97         }
  98         mutex_unlock(&idefloppy_ref_mutex);
  99         return floppy;
 100 }
 101
 102 static void ide_floppy_put(struct ide_floppy_obj *floppy)
 103 {
 104         ide_drive_t *drive = floppy->drive;
 105
 106         mutex_lock(&idefloppy_ref_mutex);
 107         kref_put(&floppy->kref, idefloppy_cleanup_obj);
 108         ide_device_put(drive);
 109         mutex_unlock(&idefloppy_ref_mutex);
 110 }
 111
 112 /*
 113  * Used to finish servicing a request. For read/write requests, we will call
 114  * ide_end_request to pass to the next buffer.
 115  */
 116 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
 117 {
 118         idefloppy_floppy_t *floppy = drive->driver_data;
 119         struct request *rq = HWGROUP(drive)->rq;
 120         int error;
 121
 122         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 123
 124         switch (uptodate) {
 125         case 0:
 126                 error = IDEFLOPPY_ERROR_GENERAL;
 127                 break;
 128
 129         case 1:
 130                 error = 0;
 131                 break;
 132
 133         default:
 134                 error = uptodate;
 135         }
 136
 137         if (error)
 138                 floppy->failed_pc = NULL;
 139         /* Why does this happen? */
 140         if (!rq)
 141                 return 0;
 142         if (!blk_special_request(rq)) {
 143                 /* our real local end request function */
 144                 ide_end_request(drive, uptodate, nsecs);
 145                 return 0;
 146         }
 147         rq->errors = error;
 148         /* fixme: need to move this local also */
 149         ide_end_drive_cmd(drive, 0, 0);
 150         return 0;
 151 }
 152
 153 static void idefloppy_update_buffers(ide_drive_t *drive,
 154                                 struct ide_atapi_pc *pc)
 155 {
 156         struct request *rq = pc->rq;
 157         struct bio *bio = rq->bio;
 158
 159         while ((bio = rq->bio) != NULL)
 160                 idefloppy_end_request(drive, 1, 0);
 161 }
 162
 163 static void ide_floppy_callback(ide_drive_t *drive, int dsc)
 164 {
 165         idefloppy_floppy_t *floppy = drive->driver_data;
 166         struct ide_atapi_pc *pc = drive->pc;
 167         int uptodate = pc->error ? 0 : 1;
 168
 169         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 170
 171         if (floppy->failed_pc == pc)
 172                 floppy->failed_pc = NULL;
 173
 174         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 175             (pc->rq && blk_pc_request(pc->rq)))
 176                 uptodate = 1; /* FIXME */
 177         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 178                 u8 *buf = pc->buf;
 179
 180                 if (!pc->error) {
 181                         floppy->sense_key = buf[2] & 0x0F;
 182                         floppy->asc = buf[12];
 183                         floppy->ascq = buf[13];
 184                         floppy->progress_indication = buf[15] & 0x80 ?
 185                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 186
 187                         if (floppy->failed_pc)
 188                                 ide_debug_log(IDE_DBG_PC, "pc = %x, ",
 189                                               floppy->failed_pc->c[0]);
 190
 191                         ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
 192                                       "ascq = %x\n", floppy->sense_key,
 193                                       floppy->asc, floppy->ascq);
 194                 } else
 195                         printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
 196                                "Aborting request!\n");
 197         }
 198
 199         idefloppy_end_request(drive, uptodate, 0);
 200 }
 201
 202 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
 203                                     struct ide_atapi_pc *pc)
 204 {
 205         /* supress error messages resulting from Medium not present */
 206         if (floppy->sense_key == 0x02 &&
 207             floppy->asc       == 0x3a &&
 208             floppy->ascq      == 0x00)
 209                 return;
 210
 211         printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
 212                         "asc = %2x, ascq = %2x\n",
 213                         floppy->drive->name, pc->c[0], floppy->sense_key,
 214                         floppy->asc, floppy->ascq);
 215
 216 }
 217
 218 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 219                 struct ide_atapi_pc *pc)
 220 {
 221         idefloppy_floppy_t *floppy = drive->driver_data;
 222
 223         if (floppy->failed_pc == NULL &&
 224             pc->c[0] != GPCMD_REQUEST_SENSE)
 225                 floppy->failed_pc = pc;
 226
 227         /* Set the current packet command */
 228         drive->pc = pc;
 229
 230         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 231                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 232                         ide_floppy_report_error(floppy, pc);
 233                 /* Giving up */
 234                 pc->error = IDEFLOPPY_ERROR_GENERAL;
 235
 236                 floppy->failed_pc = NULL;
 237                 drive->pc_callback(drive, 0);
 238                 return ide_stopped;
 239         }
 240
 241         ide_debug_log(IDE_DBG_FUNC, "%s: Retry #%d\n", __func__, pc->retries);
 242
 243         pc->retries++;
 244
 245         return ide_issue_pc(drive, WAIT_FLOPPY_CMD, NULL);
 246 }
 247
 248 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 249 {
 250         ide_init_pc(pc);
 251         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 252         pc->c[7] = 255;
 253         pc->c[8] = 255;
 254         pc->req_xfer = 255;
 255 }
 256
 257 /* A mode sense command is used to "sense" floppy parameters. */
 258 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
 259 {
 260         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 261
 262         ide_init_pc(pc);
 263         pc->c[0] = GPCMD_MODE_SENSE_10;
 264         pc->c[1] = 0;
 265         pc->c[2] = page_code;
 266
 267         switch (page_code) {
 268         case IDEFLOPPY_CAPABILITIES_PAGE:
 269                 length += 12;
 270                 break;
 271         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 272                 length += 32;
 273                 break;
 274         default:
 275                 printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
 276         }
 277         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 278         pc->req_xfer = length;
 279 }
 280
 281 static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 282                                     struct ide_atapi_pc *pc, struct request *rq,
 283                                     unsigned long sector)
 284 {
 285         idefloppy_floppy_t *floppy = drive->driver_data;
 286         int block = sector / floppy->bs_factor;
 287         int blocks = rq->nr_sectors / floppy->bs_factor;
 288         int cmd = rq_data_dir(rq);
 289
 290         ide_debug_log(IDE_DBG_FUNC, "%s: block: %d, blocks: %d\n", __func__,
 291                       block, blocks);
 292
 293         ide_init_pc(pc);
 294         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 295         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 296         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 297
 298         memcpy(rq->cmd, pc->c, 12);
 299
 300         pc->rq = rq;
 301         pc->b_count = 0;
 302         if (rq->cmd_flags & REQ_RW)
 303                 pc->flags |= PC_FLAG_WRITING;
 304         pc->buf = NULL;
 305         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
 306         pc->flags |= PC_FLAG_DMA_OK;
 307 }
 308
 309 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
 310                 struct ide_atapi_pc *pc, struct request *rq)
 311 {
 312         ide_init_pc(pc);
 313         memcpy(pc->c, rq->cmd, sizeof(pc->c));
 314         pc->rq = rq;
 315         pc->b_count = 0;
 316         if (rq->data_len && rq_data_dir(rq) == WRITE)
 317                 pc->flags |= PC_FLAG_WRITING;
 318         pc->buf = rq->data;
 319         if (rq->bio)
 320                 pc->flags |= PC_FLAG_DMA_OK;
 321         /*
 322          * possibly problematic, doesn't look like ide-floppy correctly
 323          * handled scattered requests if dma fails...
 324          */
 325         pc->req_xfer = pc->buf_size = rq->data_len;
 326 }
 327
 328 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
 329                 struct request *rq, sector_t block_s)
 330 {
 331         idefloppy_floppy_t *floppy = drive->driver_data;
 332         ide_hwif_t *hwif = drive->hwif;
 333         struct ide_atapi_pc *pc;
 334         unsigned long block = (unsigned long)block_s;
 335
 336         ide_debug_log(IDE_DBG_FUNC, "%s: dev: %s, cmd: 0x%x, cmd_type: %x, "
 337                       "errors: %d\n",
 338                       __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
 339                       rq->cmd[0], rq->cmd_type, rq->errors);
 340
 341         ide_debug_log(IDE_DBG_FUNC, "%s: sector: %ld, nr_sectors: %ld, "
 342                       "current_nr_sectors: %d\n",
 343                       __func__, (long)rq->sector, rq->nr_sectors,
 344                       rq->current_nr_sectors);
 345
 346         if (rq->errors >= ERROR_MAX) {
 347                 if (floppy->failed_pc)
 348                         ide_floppy_report_error(floppy, floppy->failed_pc);
 349                 else
 350                         printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
 351
 352                 idefloppy_end_request(drive, 0, 0);
 353                 return ide_stopped;
 354         }
 355         if (blk_fs_request(rq)) {
 356                 if (((long)rq->sector % floppy->bs_factor) ||
 357                     (rq->nr_sectors % floppy->bs_factor)) {
 358                         printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
 359                                 drive->name);
 360                         idefloppy_end_request(drive, 0, 0);
 361                         return ide_stopped;
 362                 }
 363                 pc = &floppy->queued_pc;
 364                 idefloppy_create_rw_cmd(drive, pc, rq, block);
 365         } else if (blk_special_request(rq)) {
 366                 pc = (struct ide_atapi_pc *) rq->buffer;
 367         } else if (blk_pc_request(rq)) {
 368                 pc = &floppy->queued_pc;
 369                 idefloppy_blockpc_cmd(floppy, pc, rq);
 370         } else {
 371                 blk_dump_rq_flags(rq, PFX "unsupported command in queue");
 372                 idefloppy_end_request(drive, 0, 0);
 373                 return ide_stopped;
 374         }
 375
 376         ide_init_sg_cmd(drive, rq);
 377         ide_map_sg(drive, rq);
 378
 379         pc->sg = hwif->sg_table;
 380         pc->sg_cnt = hwif->sg_nents;
 381
 382         pc->rq = rq;
 383
 384         return idefloppy_issue_pc(drive, pc);
 385 }
 386
 387 /*
 388  * Look at the flexible disk page parameters. We ignore the CHS capacity
 389  * parameters and use the LBA parameters instead.
 390  */
 391 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
 392 {
 393         idefloppy_floppy_t *floppy = drive->driver_data;
 394         struct gendisk *disk = floppy->disk;
 395         struct ide_atapi_pc pc;
 396         u8 *page;
 397         int capacity, lba_capacity;
 398         u16 transfer_rate, sector_size, cyls, rpm;
 399         u8 heads, sectors;
 400
 401         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 402
 403         if (ide_queue_pc_tail(drive, disk, &pc)) {
 404                 printk(KERN_ERR PFX "Can't get flexible disk page params\n");
 405                 return 1;
 406         }
 407
 408         if (pc.buf[3] & 0x80)
 409                 drive->atapi_flags |= IDE_AFLAG_WP;
 410         else
 411                 drive->atapi_flags &= ~IDE_AFLAG_WP;
 412
 413         set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));
 414
 415         page = &pc.buf[8];
 416
 417         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
 418         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
 419         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
 420         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
 421         heads         = pc.buf[8 + 4];
 422         sectors       = pc.buf[8 + 5];
 423
 424         capacity = cyls * heads * sectors * sector_size;
 425
 426         if (memcmp(page, &floppy->flexible_disk_page, 32))
 427                 printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 428                                 "%d sector size, %d rpm\n",
 429                                 drive->name, capacity / 1024, cyls, heads,
 430                                 sectors, transfer_rate / 8, sector_size, rpm);
 431
 432         memcpy(&floppy->flexible_disk_page, page, 32);
 433         drive->bios_cyl = cyls;
 434         drive->bios_head = heads;
 435         drive->bios_sect = sectors;
 436         lba_capacity = floppy->blocks * floppy->block_size;
 437
 438         if (capacity < lba_capacity) {
 439                 printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
 440                         "bytes, but the drive only handles %d\n",
 441                         drive->name, lba_capacity, capacity);
 442                 floppy->blocks = floppy->block_size ?
 443                         capacity / floppy->block_size : 0;
 444         }
 445         return 0;
 446 }
 447
 448 /*
 449  * Determine if a media is present in the floppy drive, and if so, its LBA
 450  * capacity.
 451  */
 452 static int ide_floppy_get_capacity(ide_drive_t *drive)
 453 {
 454         idefloppy_floppy_t *floppy = drive->driver_data;
 455         struct gendisk *disk = floppy->disk;
 456         struct ide_atapi_pc pc;
 457         u8 *cap_desc;
 458         u8 header_len, desc_cnt;
 459         int i, rc = 1, blocks, length;
 460
 461         drive->bios_cyl = 0;
 462         drive->bios_head = drive->bios_sect = 0;
 463         floppy->blocks = 0;
 464         floppy->bs_factor = 1;
 465         set_capacity(floppy->disk, 0);
 466
 467         ide_floppy_create_read_capacity_cmd(&pc);
 468         if (ide_queue_pc_tail(drive, disk, &pc)) {
 469                 printk(KERN_ERR PFX "Can't get floppy parameters\n");
 470                 return 1;
 471         }
 472         header_len = pc.buf[3];
 473         cap_desc = &pc.buf[4];
 474         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 475
 476         for (i = 0; i < desc_cnt; i++) {
 477                 unsigned int desc_start = 4 + i*8;
 478
 479                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 480                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 481
 482                 ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
 483                               "%d sector size\n",
 484                               i, blocks * length / 1024, blocks, length);
 485
 486                 if (i)
 487                         continue;
 488                 /*
 489                  * the code below is valid only for the 1st descriptor, ie i=0
 490                  */
 491
 492                 switch (pc.buf[desc_start + 4] & 0x03) {
 493                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 494                 case CAPACITY_UNFORMATTED:
 495                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 496                                 /*
 497                                  * If it is not a clik drive, break out
 498                                  * (maintains previous driver behaviour)
 499                                  */
 500                                 break;
 501                 case CAPACITY_CURRENT:
 502                         /* Normal Zip/LS-120 disks */
 503                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 504                                 printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
 505                                        "sector size\n",
 506                                        drive->name, blocks * length / 1024,
 507                                        blocks, length);
 508                         memcpy(&floppy->cap_desc, cap_desc, 8);
 509
 510                         if (!length || length % 512) {
 511                                 printk(KERN_NOTICE PFX "%s: %d bytes block size"
 512                                        " not supported\n", drive->name, length);
 513                         } else {
 514                                 floppy->blocks = blocks;
 515                                 floppy->block_size = length;
 516                                 floppy->bs_factor = length / 512;
 517                                 if (floppy->bs_factor != 1)
 518                                         printk(KERN_NOTICE PFX "%s: Warning: "
 519                                                "non 512 bytes block size not "
 520                                                "fully supported\n",
 521                                                drive->name);
 522                                 rc = 0;
 523                         }
 524                         break;
 525                 case CAPACITY_NO_CARTRIDGE:
 526                         /*
 527                          * This is a KERN_ERR so it appears on screen
 528                          * for the user to see
 529                          */
 530                         printk(KERN_ERR PFX "%s: No disk in drive\n",
 531                                drive->name);
 532                         break;
 533                 case CAPACITY_INVALID:
 534                         printk(KERN_ERR PFX "%s: Invalid capacity for disk "
 535                                 "in drive\n", drive->name);
 536                         break;
 537                 }
 538                 ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d\n",
 539                               pc.buf[desc_start + 4] & 0x03);
 540         }
 541
 542         /* Clik! disk does not support get_flexible_disk_page */
 543         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 544                 (void) ide_floppy_get_flexible_disk_page(drive);
 545
 546         set_capacity(disk, floppy->blocks * floppy->bs_factor);
 547
 548         return rc;
 549 }
 550
 551 static sector_t idefloppy_capacity(ide_drive_t *drive)
 552 {
 553         idefloppy_floppy_t *floppy = drive->driver_data;
 554         unsigned long capacity = floppy->blocks * floppy->bs_factor;
 555
 556         return capacity;
 557 }
 558
 559 #ifdef CONFIG_IDE_PROC_FS
 560 ide_devset_rw_field(bios_cyl, bios_cyl);
 561 ide_devset_rw_field(bios_head, bios_head);
 562 ide_devset_rw_field(bios_sect, bios_sect);
 563 ide_devset_rw_field(ticks, pc_delay);
 564
 565 static const struct ide_proc_devset idefloppy_settings[] = {
 566         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
 567         IDE_PROC_DEVSET(bios_head, 0,  255),
 568         IDE_PROC_DEVSET(bios_sect, 0,   63),
 569         IDE_PROC_DEVSET(ticks,     0,  255),
 570         { 0 },
 571 };
 572 #endif
 573
 574 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
 575 {
 576         u16 *id = drive->id;
 577         u8 gcw[2];
 578
 579         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
 580
 581         drive->pc_callback       = ide_floppy_callback;
 582         drive->pc_update_buffers = idefloppy_update_buffers;
 583         drive->pc_io_buffers     = ide_io_buffers;
 584
 585         if (((gcw[0] & 0x60) >> 5) == 1)
 586                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 587         /*
 588          * We used to check revisions here. At this point however I'm giving up.
 589          * Just assume they are all broken, its easier.
 590          *
 591          * The actual reason for the workarounds was likely a driver bug after
 592          * all rather than a firmware bug, and the workaround below used to hide
 593          * it. It should be fixed as of version 1.9, but to be on the safe side
 594          * we'll leave the limitation below for the 2.2.x tree.
 595          */
 596         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
 597                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
 598                 /* This value will be visible in the /proc/ide/hdx/settings */
 599                 drive->pc_delay = IDEFLOPPY_PC_DELAY;
 600                 blk_queue_max_sectors(drive->queue, 64);
 601         }
 602
 603         /*
 604          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
 605          * nasty clicking noises without it, so please don't remove this.
 606          */
 607         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
 608                 blk_queue_max_sectors(drive->queue, 64);
 609                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
 610                 /* IOMEGA Clik! drives do not support lock/unlock commands */
 611                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
 612         }
 613
 614         (void) ide_floppy_get_capacity(drive);
 615
 616         ide_proc_register_driver(drive, floppy->driver);
 617 }
 618
 619 static void ide_floppy_remove(ide_drive_t *drive)
 620 {
 621         idefloppy_floppy_t *floppy = drive->driver_data;
 622         struct gendisk *g = floppy->disk;
 623
 624         ide_proc_unregister_driver(drive, floppy->driver);
 625
 626         del_gendisk(g);
 627
 628         ide_floppy_put(floppy);
 629 }
 630
 631 static void idefloppy_cleanup_obj(struct kref *kref)
 632 {
 633         struct ide_floppy_obj *floppy = to_ide_drv(kref, ide_floppy_obj);
 634         ide_drive_t *drive = floppy->drive;
 635         struct gendisk *g = floppy->disk;
 636
 637         drive->driver_data = NULL;
 638         g->private_data = NULL;
 639         put_disk(g);
 640         kfree(floppy);
 641 }
 642
 643 #ifdef CONFIG_IDE_PROC_FS
 644 static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
 645                 int count, int *eof, void *data)
 646 {
 647         ide_drive_t*drive = (ide_drive_t *)data;
 648         int len;
 649
 650         len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
 651         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 652 }
 653
 654 static ide_proc_entry_t idefloppy_proc[] = {
 655         { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
 656         { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
 657         { NULL, 0, NULL, NULL }
 658 };
 659 #endif  /* CONFIG_IDE_PROC_FS */
 660
 661 static int ide_floppy_probe(ide_drive_t *);
 662
 663 static ide_driver_t idefloppy_driver = {
 664         .gen_driver = {
 665                 .owner          = THIS_MODULE,
 666                 .name           = "ide-floppy",
 667                 .bus            = &ide_bus_type,
 668         },
 669         .probe                  = ide_floppy_probe,
 670         .remove                 = ide_floppy_remove,
 671         .version                = IDEFLOPPY_VERSION,
 672         .media                  = ide_floppy,
 673         .do_request             = idefloppy_do_request,
 674         .end_request            = idefloppy_end_request,
 675         .error                  = __ide_error,
 676 #ifdef CONFIG_IDE_PROC_FS
 677         .proc                   = idefloppy_proc,
 678         .settings               = idefloppy_settings,
 679 #endif
 680 };
 681
 682 static int idefloppy_open(struct inode *inode, struct file *filp)
 683 {
 684         struct gendisk *disk = inode->i_bdev->bd_disk;
 685         struct ide_floppy_obj *floppy;
 686         ide_drive_t *drive;
 687         int ret = 0;
 688
 689         floppy = ide_floppy_get(disk);
 690         if (!floppy)
 691                 return -ENXIO;
 692
 693         drive = floppy->drive;
 694
 695         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 696
 697         floppy->openers++;
 698
 699         if (floppy->openers == 1) {
 700                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 701                 /* Just in case */
 702
 703                 if (ide_do_test_unit_ready(drive, disk))
 704                         ide_do_start_stop(drive, disk, 1);
 705
 706                 if (ide_floppy_get_capacity(drive)
 707                    && (filp->f_flags & O_NDELAY) == 0
 708                     /*
 709                      * Allow O_NDELAY to open a drive without a disk, or with an
 710                      * unreadable disk, so that we can get the format capacity
 711                      * of the drive or begin the format - Sam
 712                      */
 713                     ) {
 714                         ret = -EIO;
 715                         goto out_put_floppy;
 716                 }
 717
 718                 if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
 719                         ret = -EROFS;
 720                         goto out_put_floppy;
 721                 }
 722
 723                 drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
 724                 ide_set_media_lock(drive, disk, 1);
 725                 check_disk_change(inode->i_bdev);
 726         } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
 727                 ret = -EBUSY;
 728                 goto out_put_floppy;
 729         }
 730         return 0;
 731
 732 out_put_floppy:
 733         floppy->openers--;
 734         ide_floppy_put(floppy);
 735         return ret;
 736 }
 737
 738 static int idefloppy_release(struct inode *inode, struct file *filp)
 739 {
 740         struct gendisk *disk = inode->i_bdev->bd_disk;
 741         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
 742         ide_drive_t *drive = floppy->drive;
 743
 744         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 745
 746         if (floppy->openers == 1) {
 747                 ide_set_media_lock(drive, disk, 0);
 748                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 749         }
 750
 751         floppy->openers--;
 752
 753         ide_floppy_put(floppy);
 754
 755         return 0;
 756 }
 757
 758 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 759 {
 760         struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
 761                                                      ide_floppy_obj);
 762         ide_drive_t *drive = floppy->drive;
 763
 764         geo->heads = drive->bios_head;
 765         geo->sectors = drive->bios_sect;
 766         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 767         return 0;
 768 }
 769
 770 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 771                                unsigned long arg, unsigned int cmd)
 772 {
 773         idefloppy_floppy_t *floppy = drive->driver_data;
 774         struct gendisk *disk = floppy->disk;
 775         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 776
 777         if (floppy->openers > 1)
 778                 return -EBUSY;
 779
 780         ide_set_media_lock(drive, disk, prevent);
 781
 782         if (cmd == CDROMEJECT)
 783                 ide_do_start_stop(drive, disk, 2);
 784
 785         return 0;
 786 }
 787
 788 static int idefloppy_ioctl(struct inode *inode, struct file *file,
 789                         unsigned int cmd, unsigned long arg)
 790 {
 791         struct block_device *bdev = inode->i_bdev;
 792         struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
 793                                                      ide_floppy_obj);
 794         ide_drive_t *drive = floppy->drive;
 795         struct ide_atapi_pc pc;
 796         void __user *argp = (void __user *)arg;
 797         int err;
 798
 799         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
 800                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
 801
 802         err = ide_floppy_format_ioctl(drive, file, cmd, argp);
 803         if (err != -ENOTTY)
 804                 return err;
 805
 806         /*
 807          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 808          * and CDROM_SEND_PACKET (legacy) ioctls
 809          */
 810         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 811                 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
 812                                         bdev->bd_disk, cmd, argp);
 813
 814         if (err == -ENOTTY)
 815                 err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
 816
 817         return err;
 818 }
 819
 820 static int idefloppy_media_changed(struct gendisk *disk)
 821 {
 822         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
 823         ide_drive_t *drive = floppy->drive;
 824         int ret;
 825
 826         /* do not scan partitions twice if this is a removable device */
 827         if (drive->attach) {
 828                 drive->attach = 0;
 829                 return 0;
 830         }
 831         ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
 832         drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
 833         return ret;
 834 }
 835
 836 static int idefloppy_revalidate_disk(struct gendisk *disk)
 837 {
 838         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
 839         set_capacity(disk, idefloppy_capacity(floppy->drive));
 840         return 0;
 841 }
 842
 843 static struct block_device_operations idefloppy_ops = {
 844         .owner                  = THIS_MODULE,
 845         .open                   = idefloppy_open,
 846         .release                = idefloppy_release,
 847         .ioctl                  = idefloppy_ioctl,
 848         .getgeo                 = idefloppy_getgeo,
 849         .media_changed          = idefloppy_media_changed,
 850         .revalidate_disk        = idefloppy_revalidate_disk
 851 };
 852
 853 static int ide_floppy_probe(ide_drive_t *drive)
 854 {
 855         idefloppy_floppy_t *floppy;
 856         struct gendisk *g;
 857
 858         if (!strstr("ide-floppy", drive->driver_req))
 859                 goto failed;
 860
 861         if (drive->media != ide_floppy)
 862                 goto failed;
 863
 864         if (!ide_check_atapi_device(drive, DRV_NAME)) {
 865                 printk(KERN_ERR PFX "%s: not supported by this version of "
 866                        DRV_NAME "\n", drive->name);
 867                 goto failed;
 868         }
 869         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
 870         if (!floppy) {
 871                 printk(KERN_ERR PFX "%s: Can't allocate a floppy structure\n",
 872                        drive->name);
 873                 goto failed;
 874         }
 875
 876         g = alloc_disk(1 << PARTN_BITS);
 877         if (!g)
 878                 goto out_free_floppy;
 879
 880         ide_init_disk(g, drive);
 881
 882         kref_init(&floppy->kref);
 883
 884         floppy->drive = drive;
 885         floppy->driver = &idefloppy_driver;
 886         floppy->disk = g;
 887
 888         g->private_data = &floppy->driver;
 889
 890         drive->driver_data = floppy;
 891
 892         idefloppy_setup(drive, floppy);
 893
 894         g->minors = 1 << PARTN_BITS;
 895         g->driverfs_dev = &drive->gendev;
 896         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
 897         g->fops = &idefloppy_ops;
 898         drive->attach = 1;
 899         add_disk(g);
 900         return 0;
 901
 902 out_free_floppy:
 903         kfree(floppy);
 904 failed:
 905         return -ENODEV;
 906 }
 907
 908 static void __exit idefloppy_exit(void)
 909 {
 910         driver_unregister(&idefloppy_driver.gen_driver);
 911 }
 912
 913 static int __init idefloppy_init(void)
 914 {
 915         printk(KERN_INFO DRV_NAME " driver " IDEFLOPPY_VERSION "\n");
 916         return driver_register(&idefloppy_driver.gen_driver);
 917 }
 918
 919 MODULE_ALIAS("ide:*m-floppy*");
 920 MODULE_ALIAS("ide-floppy");
 921 module_init(idefloppy_init);
 922 module_exit(idefloppy_exit);
 923 MODULE_LICENSE("GPL");
 924 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
 925