linux/drivers/ide/ide-cd_ioctl.c
<<
>>
Prefs
   1/*
   2 * cdrom.c IOCTLs handling for ide-cd driver.
   3 *
   4 * Copyright (C) 1994-1996  Scott Snyder <snyder@fnald0.fnal.gov>
   5 * Copyright (C) 1996-1998  Erik Andersen <andersee@debian.org>
   6 * Copyright (C) 1998-2000  Jens Axboe <axboe@suse.de>
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/cdrom.h>
  11#include <linux/gfp.h>
  12#include <linux/ide.h>
  13#include <scsi/scsi.h>
  14
  15#include "ide-cd.h"
  16
  17/****************************************************************************
  18 * Other driver requests (open, close, check media change).
  19 */
  20int ide_cdrom_open_real(struct cdrom_device_info *cdi, int purpose)
  21{
  22        return 0;
  23}
  24
  25/*
  26 * Close down the device.  Invalidate all cached blocks.
  27 */
  28void ide_cdrom_release_real(struct cdrom_device_info *cdi)
  29{
  30        ide_drive_t *drive = cdi->handle;
  31
  32        if (!cdi->use_count)
  33                drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
  34}
  35
  36/*
  37 * add logic to try GET_EVENT command first to check for media and tray
  38 * status. this should be supported by newer cd-r/w and all DVD etc
  39 * drives
  40 */
  41int ide_cdrom_drive_status(struct cdrom_device_info *cdi, int slot_nr)
  42{
  43        ide_drive_t *drive = cdi->handle;
  44        struct media_event_desc med;
  45        struct request_sense sense;
  46        int stat;
  47
  48        if (slot_nr != CDSL_CURRENT)
  49                return -EINVAL;
  50
  51        stat = cdrom_check_status(drive, &sense);
  52        if (!stat || sense.sense_key == UNIT_ATTENTION)
  53                return CDS_DISC_OK;
  54
  55        if (!cdrom_get_media_event(cdi, &med)) {
  56                if (med.media_present)
  57                        return CDS_DISC_OK;
  58                else if (med.door_open)
  59                        return CDS_TRAY_OPEN;
  60                else
  61                        return CDS_NO_DISC;
  62        }
  63
  64        if (sense.sense_key == NOT_READY && sense.asc == 0x04
  65                        && sense.ascq == 0x04)
  66                return CDS_DISC_OK;
  67
  68        /*
  69         * If not using Mt Fuji extended media tray reports,
  70         * just return TRAY_OPEN since ATAPI doesn't provide
  71         * any other way to detect this...
  72         */
  73        if (sense.sense_key == NOT_READY) {
  74                if (sense.asc == 0x3a && sense.ascq == 1)
  75                        return CDS_NO_DISC;
  76                else
  77                        return CDS_TRAY_OPEN;
  78        }
  79        return CDS_DRIVE_NOT_READY;
  80}
  81
  82/*
  83 * ide-cd always generates media changed event if media is missing, which
  84 * makes it impossible to use for proper event reporting, so disk->events
  85 * is cleared to 0 and the following function is used only to trigger
  86 * revalidation and never propagated to userland.
  87 */
  88unsigned int ide_cdrom_check_events_real(struct cdrom_device_info *cdi,
  89                                         unsigned int clearing, int slot_nr)
  90{
  91        ide_drive_t *drive = cdi->handle;
  92        int retval;
  93
  94        if (slot_nr == CDSL_CURRENT) {
  95                (void) cdrom_check_status(drive, NULL);
  96                retval = (drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED) ? 1 : 0;
  97                drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
  98                return retval ? DISK_EVENT_MEDIA_CHANGE : 0;
  99        } else {
 100                return 0;
 101        }
 102}
 103
 104/* Eject the disk if EJECTFLAG is 0.
 105   If EJECTFLAG is 1, try to reload the disk. */
 106static
 107int cdrom_eject(ide_drive_t *drive, int ejectflag,
 108                struct request_sense *sense)
 109{
 110        struct cdrom_info *cd = drive->driver_data;
 111        struct cdrom_device_info *cdi = &cd->devinfo;
 112        char loej = 0x02;
 113        unsigned char cmd[BLK_MAX_CDB];
 114
 115        if ((drive->atapi_flags & IDE_AFLAG_NO_EJECT) && !ejectflag)
 116                return -EDRIVE_CANT_DO_THIS;
 117
 118        /* reload fails on some drives, if the tray is locked */
 119        if ((drive->atapi_flags & IDE_AFLAG_DOOR_LOCKED) && ejectflag)
 120                return 0;
 121
 122        /* only tell drive to close tray if open, if it can do that */
 123        if (ejectflag && (cdi->mask & CDC_CLOSE_TRAY))
 124                loej = 0;
 125
 126        memset(cmd, 0, BLK_MAX_CDB);
 127
 128        cmd[0] = GPCMD_START_STOP_UNIT;
 129        cmd[4] = loej | (ejectflag != 0);
 130
 131        return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, 0);
 132}
 133
 134/* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */
 135static
 136int ide_cd_lockdoor(ide_drive_t *drive, int lockflag,
 137                    struct request_sense *sense)
 138{
 139        struct request_sense my_sense;
 140        int stat;
 141
 142        if (sense == NULL)
 143                sense = &my_sense;
 144
 145        /* If the drive cannot lock the door, just pretend. */
 146        if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) {
 147                stat = 0;
 148        } else {
 149                unsigned char cmd[BLK_MAX_CDB];
 150
 151                memset(cmd, 0, BLK_MAX_CDB);
 152
 153                cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
 154                cmd[4] = lockflag ? 1 : 0;
 155
 156                stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL,
 157                                       sense, 0, 0);
 158        }
 159
 160        /* If we got an illegal field error, the drive
 161           probably cannot lock the door. */
 162        if (stat != 0 &&
 163            sense->sense_key == ILLEGAL_REQUEST &&
 164            (sense->asc == 0x24 || sense->asc == 0x20)) {
 165                printk(KERN_ERR "%s: door locking not supported\n",
 166                        drive->name);
 167                drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
 168                stat = 0;
 169        }
 170
 171        /* no medium, that's alright. */
 172        if (stat != 0 && sense->sense_key == NOT_READY && sense->asc == 0x3a)
 173                stat = 0;
 174
 175        if (stat == 0) {
 176                if (lockflag)
 177                        drive->atapi_flags |= IDE_AFLAG_DOOR_LOCKED;
 178                else
 179                        drive->atapi_flags &= ~IDE_AFLAG_DOOR_LOCKED;
 180        }
 181
 182        return stat;
 183}
 184
 185int ide_cdrom_tray_move(struct cdrom_device_info *cdi, int position)
 186{
 187        ide_drive_t *drive = cdi->handle;
 188        struct request_sense sense;
 189
 190        if (position) {
 191                int stat = ide_cd_lockdoor(drive, 0, &sense);
 192
 193                if (stat)
 194                        return stat;
 195        }
 196
 197        return cdrom_eject(drive, !position, &sense);
 198}
 199
 200int ide_cdrom_lock_door(struct cdrom_device_info *cdi, int lock)
 201{
 202        ide_drive_t *drive = cdi->handle;
 203
 204        return ide_cd_lockdoor(drive, lock, NULL);
 205}
 206
 207/*
 208 * ATAPI devices are free to select the speed you request or any slower
 209 * rate. :-(  Requesting too fast a speed will _not_ produce an error.
 210 */
 211int ide_cdrom_select_speed(struct cdrom_device_info *cdi, int speed)
 212{
 213        ide_drive_t *drive = cdi->handle;
 214        struct cdrom_info *cd = drive->driver_data;
 215        struct request_sense sense;
 216        u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
 217        int stat;
 218        unsigned char cmd[BLK_MAX_CDB];
 219
 220        if (speed == 0)
 221                speed = 0xffff; /* set to max */
 222        else
 223                speed *= 177;   /* Nx to kbytes/s */
 224
 225        memset(cmd, 0, BLK_MAX_CDB);
 226
 227        cmd[0] = GPCMD_SET_SPEED;
 228        /* Read Drive speed in kbytes/second MSB/LSB */
 229        cmd[2] = (speed >> 8) & 0xff;
 230        cmd[3] = speed & 0xff;
 231        if ((cdi->mask & (CDC_CD_R | CDC_CD_RW | CDC_DVD_R)) !=
 232            (CDC_CD_R | CDC_CD_RW | CDC_DVD_R)) {
 233                /* Write Drive speed in kbytes/second MSB/LSB */
 234                cmd[4] = (speed >> 8) & 0xff;
 235                cmd[5] = speed & 0xff;
 236        }
 237
 238        stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
 239
 240        if (!ide_cdrom_get_capabilities(drive, buf)) {
 241                ide_cdrom_update_speed(drive, buf);
 242                cdi->speed = cd->current_speed;
 243        }
 244
 245        return 0;
 246}
 247
 248int ide_cdrom_get_last_session(struct cdrom_device_info *cdi,
 249                               struct cdrom_multisession *ms_info)
 250{
 251        struct atapi_toc *toc;
 252        ide_drive_t *drive = cdi->handle;
 253        struct cdrom_info *info = drive->driver_data;
 254        struct request_sense sense;
 255        int ret;
 256
 257        if ((drive->atapi_flags & IDE_AFLAG_TOC_VALID) == 0 || !info->toc) {
 258                ret = ide_cd_read_toc(drive, &sense);
 259                if (ret)
 260                        return ret;
 261        }
 262
 263        toc = info->toc;
 264        ms_info->addr.lba = toc->last_session_lba;
 265        ms_info->xa_flag = toc->xa_flag;
 266
 267        return 0;
 268}
 269
 270int ide_cdrom_get_mcn(struct cdrom_device_info *cdi,
 271                      struct cdrom_mcn *mcn_info)
 272{
 273        ide_drive_t *drive = cdi->handle;
 274        int stat, mcnlen;
 275        char buf[24];
 276        unsigned char cmd[BLK_MAX_CDB];
 277        unsigned len = sizeof(buf);
 278
 279        memset(cmd, 0, BLK_MAX_CDB);
 280
 281        cmd[0] = GPCMD_READ_SUBCHANNEL;
 282        cmd[1] = 2;             /* MSF addressing */
 283        cmd[2] = 0x40;  /* request subQ data */
 284        cmd[3] = 2;             /* format */
 285        cmd[8] = len;
 286
 287        stat = ide_cd_queue_pc(drive, cmd, 0, buf, &len, NULL, 0, 0);
 288        if (stat)
 289                return stat;
 290
 291        mcnlen = sizeof(mcn_info->medium_catalog_number) - 1;
 292        memcpy(mcn_info->medium_catalog_number, buf + 9, mcnlen);
 293        mcn_info->medium_catalog_number[mcnlen] = '\0';
 294
 295        return 0;
 296}
 297
 298int ide_cdrom_reset(struct cdrom_device_info *cdi)
 299{
 300        ide_drive_t *drive = cdi->handle;
 301        struct cdrom_info *cd = drive->driver_data;
 302        struct request_sense sense;
 303        struct request *rq;
 304        int ret;
 305
 306        rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 307        rq->cmd_type = REQ_TYPE_SPECIAL;
 308        rq->cmd_flags = REQ_QUIET;
 309        ret = blk_execute_rq(drive->queue, cd->disk, rq, 0);
 310        blk_put_request(rq);
 311        /*
 312         * A reset will unlock the door. If it was previously locked,
 313         * lock it again.
 314         */
 315        if (drive->atapi_flags & IDE_AFLAG_DOOR_LOCKED)
 316                (void)ide_cd_lockdoor(drive, 1, &sense);
 317
 318        return ret;
 319}
 320
 321static int ide_cd_get_toc_entry(ide_drive_t *drive, int track,
 322                                struct atapi_toc_entry **ent)
 323{
 324        struct cdrom_info *info = drive->driver_data;
 325        struct atapi_toc *toc = info->toc;
 326        int ntracks;
 327
 328        /*
 329         * don't serve cached data, if the toc isn't valid
 330         */
 331        if ((drive->atapi_flags & IDE_AFLAG_TOC_VALID) == 0)
 332                return -EINVAL;
 333
 334        /* Check validity of requested track number. */
 335        ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
 336
 337        if (toc->hdr.first_track == CDROM_LEADOUT)
 338                ntracks = 0;
 339
 340        if (track == CDROM_LEADOUT)
 341                *ent = &toc->ent[ntracks];
 342        else if (track < toc->hdr.first_track || track > toc->hdr.last_track)
 343                return -EINVAL;
 344        else
 345                *ent = &toc->ent[track - toc->hdr.first_track];
 346
 347        return 0;
 348}
 349
 350static int ide_cd_fake_play_trkind(ide_drive_t *drive, void *arg)
 351{
 352        struct cdrom_ti *ti = arg;
 353        struct atapi_toc_entry *first_toc, *last_toc;
 354        unsigned long lba_start, lba_end;
 355        int stat;
 356        struct request_sense sense;
 357        unsigned char cmd[BLK_MAX_CDB];
 358
 359        stat = ide_cd_get_toc_entry(drive, ti->cdti_trk0, &first_toc);
 360        if (stat)
 361                return stat;
 362
 363        stat = ide_cd_get_toc_entry(drive, ti->cdti_trk1, &last_toc);
 364        if (stat)
 365                return stat;
 366
 367        if (ti->cdti_trk1 != CDROM_LEADOUT)
 368                ++last_toc;
 369        lba_start = first_toc->addr.lba;
 370        lba_end   = last_toc->addr.lba;
 371
 372        if (lba_end <= lba_start)
 373                return -EINVAL;
 374
 375        memset(cmd, 0, BLK_MAX_CDB);
 376
 377        cmd[0] = GPCMD_PLAY_AUDIO_MSF;
 378        lba_to_msf(lba_start,   &cmd[3], &cmd[4], &cmd[5]);
 379        lba_to_msf(lba_end - 1, &cmd[6], &cmd[7], &cmd[8]);
 380
 381        return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
 382}
 383
 384static int ide_cd_read_tochdr(ide_drive_t *drive, void *arg)
 385{
 386        struct cdrom_info *cd = drive->driver_data;
 387        struct cdrom_tochdr *tochdr = arg;
 388        struct atapi_toc *toc;
 389        int stat;
 390
 391        /* Make sure our saved TOC is valid. */
 392        stat = ide_cd_read_toc(drive, NULL);
 393        if (stat)
 394                return stat;
 395
 396        toc = cd->toc;
 397        tochdr->cdth_trk0 = toc->hdr.first_track;
 398        tochdr->cdth_trk1 = toc->hdr.last_track;
 399
 400        return 0;
 401}
 402
 403static int ide_cd_read_tocentry(ide_drive_t *drive, void *arg)
 404{
 405        struct cdrom_tocentry *tocentry = arg;
 406        struct atapi_toc_entry *toce;
 407        int stat;
 408
 409        stat = ide_cd_get_toc_entry(drive, tocentry->cdte_track, &toce);
 410        if (stat)
 411                return stat;
 412
 413        tocentry->cdte_ctrl = toce->control;
 414        tocentry->cdte_adr  = toce->adr;
 415        if (tocentry->cdte_format == CDROM_MSF) {
 416                lba_to_msf(toce->addr.lba,
 417                           &tocentry->cdte_addr.msf.minute,
 418                           &tocentry->cdte_addr.msf.second,
 419                           &tocentry->cdte_addr.msf.frame);
 420        } else
 421                tocentry->cdte_addr.lba = toce->addr.lba;
 422
 423        return 0;
 424}
 425
 426int ide_cdrom_audio_ioctl(struct cdrom_device_info *cdi,
 427                          unsigned int cmd, void *arg)
 428{
 429        ide_drive_t *drive = cdi->handle;
 430
 431        switch (cmd) {
 432        /*
 433         * emulate PLAY_AUDIO_TI command with PLAY_AUDIO_10, since
 434         * atapi doesn't support it
 435         */
 436        case CDROMPLAYTRKIND:
 437                return ide_cd_fake_play_trkind(drive, arg);
 438        case CDROMREADTOCHDR:
 439                return ide_cd_read_tochdr(drive, arg);
 440        case CDROMREADTOCENTRY:
 441                return ide_cd_read_tocentry(drive, arg);
 442        default:
 443                return -EINVAL;
 444        }
 445}
 446
 447/* the generic packet interface to cdrom.c */
 448int ide_cdrom_packet(struct cdrom_device_info *cdi,
 449                            struct packet_command *cgc)
 450{
 451        ide_drive_t *drive = cdi->handle;
 452        unsigned int flags = 0;
 453        unsigned len = cgc->buflen;
 454
 455        if (cgc->timeout <= 0)
 456                cgc->timeout = ATAPI_WAIT_PC;
 457
 458        /* here we queue the commands from the uniform CD-ROM
 459           layer. the packet must be complete, as we do not
 460           touch it at all. */
 461
 462        if (cgc->data_direction == CGC_DATA_WRITE)
 463                flags |= REQ_WRITE;
 464
 465        if (cgc->sense)
 466                memset(cgc->sense, 0, sizeof(struct request_sense));
 467
 468        if (cgc->quiet)
 469                flags |= REQ_QUIET;
 470
 471        cgc->stat = ide_cd_queue_pc(drive, cgc->cmd,
 472                                    cgc->data_direction == CGC_DATA_WRITE,
 473                                    cgc->buffer, &len,
 474                                    cgc->sense, cgc->timeout, flags);
 475        if (!cgc->stat)
 476                cgc->buflen -= len;
 477        return cgc->stat;
 478}
 479
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.