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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/kernel.h>
0003 #include <linux/mm.h>
0004 #include <linux/fs.h>
0005 #include <linux/errno.h>
0006 #include <linux/string.h>
0007 #include <linux/blkdev.h>
0008 #include <linux/module.h>
0009 #include <linux/blkpg.h>
0010 #include <linux/cdrom.h>
0011 #include <linux/delay.h>
0012 #include <linux/slab.h>
0013 #include <asm/io.h>
0014 #include <linux/uaccess.h>
0015 
0016 #include <scsi/scsi.h>
0017 #include <scsi/scsi_dbg.h>
0018 #include <scsi/scsi_device.h>
0019 #include <scsi/scsi_eh.h>
0020 #include <scsi/scsi_host.h>
0021 #include <scsi/scsi_ioctl.h>
0022 #include <scsi/scsi_cmnd.h>
0023 
0024 #include "sr.h"
0025 
0026 #if 0
0027 #define DEBUG
0028 #endif
0029 
0030 /* The sr_is_xa() seems to trigger firmware bugs with some drives :-(
0031  * It is off by default and can be turned on with this module parameter */
0032 static int xa_test = 0;
0033 
0034 module_param(xa_test, int, S_IRUGO | S_IWUSR);
0035 
0036 static int sr_read_tochdr(struct cdrom_device_info *cdi,
0037         struct cdrom_tochdr *tochdr)
0038 {
0039     struct scsi_cd *cd = cdi->handle;
0040     struct packet_command cgc;
0041     int result;
0042     unsigned char *buffer;
0043 
0044     buffer = kzalloc(32, GFP_KERNEL);
0045     if (!buffer)
0046         return -ENOMEM;
0047 
0048     memset(&cgc, 0, sizeof(struct packet_command));
0049     cgc.timeout = IOCTL_TIMEOUT;
0050     cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
0051     cgc.cmd[8] = 12;        /* LSB of length */
0052     cgc.buffer = buffer;
0053     cgc.buflen = 12;
0054     cgc.quiet = 1;
0055     cgc.data_direction = DMA_FROM_DEVICE;
0056 
0057     result = sr_do_ioctl(cd, &cgc);
0058     if (result)
0059         goto err;
0060 
0061     tochdr->cdth_trk0 = buffer[2];
0062     tochdr->cdth_trk1 = buffer[3];
0063 
0064 err:
0065     kfree(buffer);
0066     return result;
0067 }
0068 
0069 static int sr_read_tocentry(struct cdrom_device_info *cdi,
0070         struct cdrom_tocentry *tocentry)
0071 {
0072     struct scsi_cd *cd = cdi->handle;
0073     struct packet_command cgc;
0074     int result;
0075     unsigned char *buffer;
0076 
0077     buffer = kzalloc(32, GFP_KERNEL);
0078     if (!buffer)
0079         return -ENOMEM;
0080 
0081     memset(&cgc, 0, sizeof(struct packet_command));
0082     cgc.timeout = IOCTL_TIMEOUT;
0083     cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
0084     cgc.cmd[1] |= (tocentry->cdte_format == CDROM_MSF) ? 0x02 : 0;
0085     cgc.cmd[6] = tocentry->cdte_track;
0086     cgc.cmd[8] = 12;        /* LSB of length */
0087     cgc.buffer = buffer;
0088     cgc.buflen = 12;
0089     cgc.data_direction = DMA_FROM_DEVICE;
0090 
0091     result = sr_do_ioctl(cd, &cgc);
0092     if (result)
0093         goto err;
0094 
0095     tocentry->cdte_ctrl = buffer[5] & 0xf;
0096     tocentry->cdte_adr = buffer[5] >> 4;
0097     tocentry->cdte_datamode = (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
0098     if (tocentry->cdte_format == CDROM_MSF) {
0099         tocentry->cdte_addr.msf.minute = buffer[9];
0100         tocentry->cdte_addr.msf.second = buffer[10];
0101         tocentry->cdte_addr.msf.frame = buffer[11];
0102     } else
0103         tocentry->cdte_addr.lba = (((((buffer[8] << 8) + buffer[9]) << 8)
0104             + buffer[10]) << 8) + buffer[11];
0105 
0106 err:
0107     kfree(buffer);
0108     return result;
0109 }
0110 
0111 #define IOCTL_RETRIES 3
0112 
0113 /* ATAPI drives don't have a SCMD_PLAYAUDIO_TI command.  When these drives
0114    are emulating a SCSI device via the idescsi module, they need to have
0115    CDROMPLAYTRKIND commands translated into CDROMPLAYMSF commands for them */
0116 
0117 static int sr_fake_playtrkind(struct cdrom_device_info *cdi, struct cdrom_ti *ti)
0118 {
0119     struct cdrom_tocentry trk0_te, trk1_te;
0120     struct cdrom_tochdr tochdr;
0121     struct packet_command cgc;
0122     int ntracks, ret;
0123 
0124     ret = sr_read_tochdr(cdi, &tochdr);
0125     if (ret)
0126         return ret;
0127 
0128     ntracks = tochdr.cdth_trk1 - tochdr.cdth_trk0 + 1;
0129     
0130     if (ti->cdti_trk1 == ntracks) 
0131         ti->cdti_trk1 = CDROM_LEADOUT;
0132     else if (ti->cdti_trk1 != CDROM_LEADOUT)
0133         ti->cdti_trk1 ++;
0134 
0135     trk0_te.cdte_track = ti->cdti_trk0;
0136     trk0_te.cdte_format = CDROM_MSF;
0137     trk1_te.cdte_track = ti->cdti_trk1;
0138     trk1_te.cdte_format = CDROM_MSF;
0139     
0140     ret = sr_read_tocentry(cdi, &trk0_te);
0141     if (ret)
0142         return ret;
0143     ret = sr_read_tocentry(cdi, &trk1_te);
0144     if (ret)
0145         return ret;
0146 
0147     memset(&cgc, 0, sizeof(struct packet_command));
0148     cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
0149     cgc.cmd[3] = trk0_te.cdte_addr.msf.minute;
0150     cgc.cmd[4] = trk0_te.cdte_addr.msf.second;
0151     cgc.cmd[5] = trk0_te.cdte_addr.msf.frame;
0152     cgc.cmd[6] = trk1_te.cdte_addr.msf.minute;
0153     cgc.cmd[7] = trk1_te.cdte_addr.msf.second;
0154     cgc.cmd[8] = trk1_te.cdte_addr.msf.frame;
0155     cgc.data_direction = DMA_NONE;
0156     cgc.timeout = IOCTL_TIMEOUT;
0157     return sr_do_ioctl(cdi->handle, &cgc);
0158 }
0159 
0160 static int sr_play_trkind(struct cdrom_device_info *cdi,
0161         struct cdrom_ti *ti)
0162 
0163 {
0164     struct scsi_cd *cd = cdi->handle;
0165     struct packet_command cgc;
0166     int result;
0167 
0168     memset(&cgc, 0, sizeof(struct packet_command));
0169     cgc.timeout = IOCTL_TIMEOUT;
0170     cgc.cmd[0] = GPCMD_PLAYAUDIO_TI;
0171     cgc.cmd[4] = ti->cdti_trk0;
0172     cgc.cmd[5] = ti->cdti_ind0;
0173     cgc.cmd[7] = ti->cdti_trk1;
0174     cgc.cmd[8] = ti->cdti_ind1;
0175     cgc.data_direction = DMA_NONE;
0176 
0177     result = sr_do_ioctl(cd, &cgc);
0178     if (result == -EDRIVE_CANT_DO_THIS)
0179         result = sr_fake_playtrkind(cdi, ti);
0180 
0181     return result;
0182 }
0183 
0184 /* We do our own retries because we want to know what the specific
0185    error code is.  Normally the UNIT_ATTENTION code will automatically
0186    clear after one error */
0187 
0188 int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
0189 {
0190     struct scsi_device *SDev;
0191     struct scsi_sense_hdr local_sshdr, *sshdr = &local_sshdr;
0192     int result, err = 0, retries = 0;
0193 
0194     SDev = cd->device;
0195 
0196     if (cgc->sshdr)
0197         sshdr = cgc->sshdr;
0198 
0199       retry:
0200     if (!scsi_block_when_processing_errors(SDev)) {
0201         err = -ENODEV;
0202         goto out;
0203     }
0204 
0205     result = scsi_execute(SDev, cgc->cmd, cgc->data_direction,
0206                   cgc->buffer, cgc->buflen, NULL, sshdr,
0207                   cgc->timeout, IOCTL_RETRIES, 0, 0, NULL);
0208 
0209     /* Minimal error checking.  Ignore cases we know about, and report the rest. */
0210     if (result < 0) {
0211         err = result;
0212         goto out;
0213     }
0214     if (scsi_status_is_check_condition(result)) {
0215         switch (sshdr->sense_key) {
0216         case UNIT_ATTENTION:
0217             SDev->changed = 1;
0218             if (!cgc->quiet)
0219                 sr_printk(KERN_INFO, cd,
0220                       "disc change detected.\n");
0221             if (retries++ < 10)
0222                 goto retry;
0223             err = -ENOMEDIUM;
0224             break;
0225         case NOT_READY: /* This happens if there is no disc in drive */
0226             if (sshdr->asc == 0x04 &&
0227                 sshdr->ascq == 0x01) {
0228                 /* sense: Logical unit is in process of becoming ready */
0229                 if (!cgc->quiet)
0230                     sr_printk(KERN_INFO, cd,
0231                           "CDROM not ready yet.\n");
0232                 if (retries++ < 10) {
0233                     /* sleep 2 sec and try again */
0234                     ssleep(2);
0235                     goto retry;
0236                 } else {
0237                     /* 20 secs are enough? */
0238                     err = -ENOMEDIUM;
0239                     break;
0240                 }
0241             }
0242             if (!cgc->quiet)
0243                 sr_printk(KERN_INFO, cd,
0244                       "CDROM not ready.  Make sure there "
0245                       "is a disc in the drive.\n");
0246             err = -ENOMEDIUM;
0247             break;
0248         case ILLEGAL_REQUEST:
0249             err = -EIO;
0250             if (sshdr->asc == 0x20 &&
0251                 sshdr->ascq == 0x00)
0252                 /* sense: Invalid command operation code */
0253                 err = -EDRIVE_CANT_DO_THIS;
0254             break;
0255         default:
0256             err = -EIO;
0257         }
0258     }
0259 
0260     /* Wake up a process waiting for device */
0261       out:
0262     cgc->stat = err;
0263     return err;
0264 }
0265 
0266 /* ---------------------------------------------------------------------- */
0267 /* interface to cdrom.c                                                   */
0268 
0269 int sr_tray_move(struct cdrom_device_info *cdi, int pos)
0270 {
0271     Scsi_CD *cd = cdi->handle;
0272     struct packet_command cgc;
0273 
0274     memset(&cgc, 0, sizeof(struct packet_command));
0275     cgc.cmd[0] = GPCMD_START_STOP_UNIT;
0276     cgc.cmd[4] = (pos == 0) ? 0x03 /* close */ : 0x02 /* eject */ ;
0277     cgc.data_direction = DMA_NONE;
0278     cgc.timeout = IOCTL_TIMEOUT;
0279     return sr_do_ioctl(cd, &cgc);
0280 }
0281 
0282 int sr_lock_door(struct cdrom_device_info *cdi, int lock)
0283 {
0284     Scsi_CD *cd = cdi->handle;
0285 
0286     return scsi_set_medium_removal(cd->device, lock ?
0287                SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
0288 }
0289 
0290 int sr_drive_status(struct cdrom_device_info *cdi, int slot)
0291 {
0292     struct scsi_cd *cd = cdi->handle;
0293     struct scsi_sense_hdr sshdr;
0294     struct media_event_desc med;
0295 
0296     if (CDSL_CURRENT != slot) {
0297         /* we have no changer support */
0298         return -EINVAL;
0299     }
0300     if (!scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
0301         return CDS_DISC_OK;
0302 
0303     /* SK/ASC/ASCQ of 2/4/1 means "unit is becoming ready" */
0304     if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
0305             && sshdr.asc == 0x04 && sshdr.ascq == 0x01)
0306         return CDS_DRIVE_NOT_READY;
0307 
0308     if (!cdrom_get_media_event(cdi, &med)) {
0309         if (med.media_present)
0310             return CDS_DISC_OK;
0311         else if (med.door_open)
0312             return CDS_TRAY_OPEN;
0313         else
0314             return CDS_NO_DISC;
0315     }
0316 
0317     /*
0318      * SK/ASC/ASCQ of 2/4/2 means "initialization required"
0319      * Using CD_TRAY_OPEN results in an START_STOP_UNIT to close
0320      * the tray, which resolves the initialization requirement.
0321      */
0322     if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
0323             && sshdr.asc == 0x04 && sshdr.ascq == 0x02)
0324         return CDS_TRAY_OPEN;
0325 
0326     /*
0327      * 0x04 is format in progress .. but there must be a disc present!
0328      */
0329     if (sshdr.sense_key == NOT_READY && sshdr.asc == 0x04)
0330         return CDS_DISC_OK;
0331 
0332     /*
0333      * If not using Mt Fuji extended media tray reports,
0334      * just return TRAY_OPEN since ATAPI doesn't provide
0335      * any other way to detect this...
0336      */
0337     if (scsi_sense_valid(&sshdr) &&
0338         /* 0x3a is medium not present */
0339         sshdr.asc == 0x3a)
0340         return CDS_NO_DISC;
0341     else
0342         return CDS_TRAY_OPEN;
0343 
0344     return CDS_DRIVE_NOT_READY;
0345 }
0346 
0347 int sr_disk_status(struct cdrom_device_info *cdi)
0348 {
0349     Scsi_CD *cd = cdi->handle;
0350     struct cdrom_tochdr toc_h;
0351     struct cdrom_tocentry toc_e;
0352     int i, rc, have_datatracks = 0;
0353 
0354     /* look for data tracks */
0355     rc = sr_read_tochdr(cdi, &toc_h);
0356     if (rc)
0357         return (rc == -ENOMEDIUM) ? CDS_NO_DISC : CDS_NO_INFO;
0358 
0359     for (i = toc_h.cdth_trk0; i <= toc_h.cdth_trk1; i++) {
0360         toc_e.cdte_track = i;
0361         toc_e.cdte_format = CDROM_LBA;
0362         if (sr_read_tocentry(cdi, &toc_e))
0363             return CDS_NO_INFO;
0364         if (toc_e.cdte_ctrl & CDROM_DATA_TRACK) {
0365             have_datatracks = 1;
0366             break;
0367         }
0368     }
0369     if (!have_datatracks)
0370         return CDS_AUDIO;
0371 
0372     if (cd->xa_flag)
0373         return CDS_XA_2_1;
0374     else
0375         return CDS_DATA_1;
0376 }
0377 
0378 int sr_get_last_session(struct cdrom_device_info *cdi,
0379             struct cdrom_multisession *ms_info)
0380 {
0381     Scsi_CD *cd = cdi->handle;
0382 
0383     ms_info->addr.lba = cd->ms_offset;
0384     ms_info->xa_flag = cd->xa_flag || cd->ms_offset > 0;
0385 
0386     return 0;
0387 }
0388 
0389 int sr_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
0390 {
0391     Scsi_CD *cd = cdi->handle;
0392     struct packet_command cgc;
0393     char *buffer = kzalloc(32, GFP_KERNEL);
0394     int result;
0395 
0396     if (!buffer)
0397         return -ENOMEM;
0398 
0399     memset(&cgc, 0, sizeof(struct packet_command));
0400     cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
0401     cgc.cmd[2] = 0x40;  /* I do want the subchannel info */
0402     cgc.cmd[3] = 0x02;  /* Give me medium catalog number info */
0403     cgc.cmd[8] = 24;
0404     cgc.buffer = buffer;
0405     cgc.buflen = 24;
0406     cgc.data_direction = DMA_FROM_DEVICE;
0407     cgc.timeout = IOCTL_TIMEOUT;
0408     result = sr_do_ioctl(cd, &cgc);
0409     if (result)
0410         goto err;
0411 
0412     memcpy(mcn->medium_catalog_number, buffer + 9, 13);
0413     mcn->medium_catalog_number[13] = 0;
0414 
0415 err:
0416     kfree(buffer);
0417     return result;
0418 }
0419 
0420 int sr_reset(struct cdrom_device_info *cdi)
0421 {
0422     return 0;
0423 }
0424 
0425 int sr_select_speed(struct cdrom_device_info *cdi, int speed)
0426 {
0427     Scsi_CD *cd = cdi->handle;
0428     struct packet_command cgc;
0429 
0430     if (speed == 0)
0431         speed = 0xffff; /* set to max */
0432     else
0433         speed *= 177;   /* Nx to kbyte/s */
0434 
0435     memset(&cgc, 0, sizeof(struct packet_command));
0436     cgc.cmd[0] = GPCMD_SET_SPEED;   /* SET CD SPEED */
0437     cgc.cmd[2] = (speed >> 8) & 0xff;   /* MSB for speed (in kbytes/sec) */
0438     cgc.cmd[3] = speed & 0xff;  /* LSB */
0439     cgc.data_direction = DMA_NONE;
0440     cgc.timeout = IOCTL_TIMEOUT;
0441 
0442     if (sr_do_ioctl(cd, &cgc))
0443         return -EIO;
0444     return 0;
0445 }
0446 
0447 /* ----------------------------------------------------------------------- */
0448 /* this is called by the generic cdrom driver. arg is a _kernel_ pointer,  */
0449 /* because the generic cdrom driver does the user access stuff for us.     */
0450 /* only cdromreadtochdr and cdromreadtocentry are left - for use with the  */
0451 /* sr_disk_status interface for the generic cdrom driver.                  */
0452 
0453 int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
0454 {
0455     switch (cmd) {
0456     case CDROMREADTOCHDR:
0457         return sr_read_tochdr(cdi, arg);
0458     case CDROMREADTOCENTRY:
0459         return sr_read_tocentry(cdi, arg);
0460     case CDROMPLAYTRKIND:
0461         return sr_play_trkind(cdi, arg);
0462     default:
0463         return -EINVAL;
0464     }
0465 }
0466 
0467 /* -----------------------------------------------------------------------
0468  * a function to read all sorts of funny cdrom sectors using the READ_CD
0469  * scsi-3 mmc command
0470  *
0471  * lba:     linear block address
0472  * format:  0 = data (anything)
0473  *          1 = audio
0474  *          2 = data (mode 1)
0475  *          3 = data (mode 2)
0476  *          4 = data (mode 2 form1)
0477  *          5 = data (mode 2 form2)
0478  * blksize: 2048 | 2336 | 2340 | 2352
0479  */
0480 
0481 static int sr_read_cd(Scsi_CD *cd, unsigned char *dest, int lba, int format, int blksize)
0482 {
0483     struct packet_command cgc;
0484 
0485 #ifdef DEBUG
0486     sr_printk(KERN_INFO, cd, "sr_read_cd lba=%d format=%d blksize=%d\n",
0487           lba, format, blksize);
0488 #endif
0489 
0490     memset(&cgc, 0, sizeof(struct packet_command));
0491     cgc.cmd[0] = GPCMD_READ_CD; /* READ_CD */
0492     cgc.cmd[1] = ((format & 7) << 2);
0493     cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
0494     cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
0495     cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
0496     cgc.cmd[5] = (unsigned char) lba & 0xff;
0497     cgc.cmd[8] = 1;
0498     switch (blksize) {
0499     case 2336:
0500         cgc.cmd[9] = 0x58;
0501         break;
0502     case 2340:
0503         cgc.cmd[9] = 0x78;
0504         break;
0505     case 2352:
0506         cgc.cmd[9] = 0xf8;
0507         break;
0508     default:
0509         cgc.cmd[9] = 0x10;
0510         break;
0511     }
0512     cgc.buffer = dest;
0513     cgc.buflen = blksize;
0514     cgc.data_direction = DMA_FROM_DEVICE;
0515     cgc.timeout = IOCTL_TIMEOUT;
0516     return sr_do_ioctl(cd, &cgc);
0517 }
0518 
0519 /*
0520  * read sectors with blocksizes other than 2048
0521  */
0522 
0523 static int sr_read_sector(Scsi_CD *cd, int lba, int blksize, unsigned char *dest)
0524 {
0525     struct packet_command cgc;
0526     int rc;
0527 
0528     /* we try the READ CD command first... */
0529     if (cd->readcd_known) {
0530         rc = sr_read_cd(cd, dest, lba, 0, blksize);
0531         if (-EDRIVE_CANT_DO_THIS != rc)
0532             return rc;
0533         cd->readcd_known = 0;
0534         sr_printk(KERN_INFO, cd,
0535               "CDROM doesn't support READ CD (0xbe) command\n");
0536         /* fall & retry the other way */
0537     }
0538     /* ... if this fails, we switch the blocksize using MODE SELECT */
0539     if (blksize != cd->device->sector_size) {
0540         if (0 != (rc = sr_set_blocklength(cd, blksize)))
0541             return rc;
0542     }
0543 #ifdef DEBUG
0544     sr_printk(KERN_INFO, cd, "sr_read_sector lba=%d blksize=%d\n",
0545           lba, blksize);
0546 #endif
0547 
0548     memset(&cgc, 0, sizeof(struct packet_command));
0549     cgc.cmd[0] = GPCMD_READ_10;
0550     cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
0551     cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
0552     cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
0553     cgc.cmd[5] = (unsigned char) lba & 0xff;
0554     cgc.cmd[8] = 1;
0555     cgc.buffer = dest;
0556     cgc.buflen = blksize;
0557     cgc.data_direction = DMA_FROM_DEVICE;
0558     cgc.timeout = IOCTL_TIMEOUT;
0559     rc = sr_do_ioctl(cd, &cgc);
0560 
0561     if (blksize != CD_FRAMESIZE)
0562         rc |= sr_set_blocklength(cd, CD_FRAMESIZE);
0563     return rc;
0564 }
0565 
0566 /*
0567  * read a sector in raw mode to check the sector format
0568  * ret: 1 == mode2 (XA), 0 == mode1, <0 == error 
0569  */
0570 
0571 int sr_is_xa(Scsi_CD *cd)
0572 {
0573     unsigned char *raw_sector;
0574     int is_xa;
0575 
0576     if (!xa_test)
0577         return 0;
0578 
0579     raw_sector = kmalloc(2048, GFP_KERNEL);
0580     if (!raw_sector)
0581         return -ENOMEM;
0582     if (0 == sr_read_sector(cd, cd->ms_offset + 16,
0583                 CD_FRAMESIZE_RAW1, raw_sector)) {
0584         is_xa = (raw_sector[3] == 0x02) ? 1 : 0;
0585     } else {
0586         /* read a raw sector failed for some reason. */
0587         is_xa = -1;
0588     }
0589     kfree(raw_sector);
0590 #ifdef DEBUG
0591     sr_printk(KERN_INFO, cd, "sr_is_xa: %d\n", is_xa);
0592 #endif
0593     return is_xa;
0594 }
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