drivers/scsi/sr_vendor.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* -*-linux-c-*-
0003
0004  * vendor-specific code for SCSI CD-ROM's goes here.
0005  *
0006  * This is needed becauce most of the new features (multisession and
0007  * the like) are too new to be included into the SCSI-II standard (to
0008  * be exact: there is'nt anything in my draft copy).
0009  *
0010  * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
0011  *           multisession using the READ TOC command (like SONY).
0012  *
0013  *           Rearranged stuff here: SCSI-3 is included allways, support
0014  *           for NEC/TOSHIBA/HP commands is optional.
0015  *
0016  *   Gerd Knorr <kraxel@cs.tu-berlin.de>
0017  *
0018  * --------------------------------------------------------------------------
0019  *
0020  * support for XA/multisession-CD's
0021  *
0022  *   - NEC:     Detection and support of multisession CD's.
0023  *
0024  *   - TOSHIBA: Detection and support of multisession CD's.
0025  *              Some XA-Sector tweaking, required for older drives.
0026  *
0027  *   - SONY:    Detection and support of multisession CD's.
0028  *              added by Thomas Quinot <thomas@cuivre.freenix.fr>
0029  *
0030  *   - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
0031  *              work with SONY (SCSI3 now)  code.
0032  *
0033  *   - HP:      Much like SONY, but a little different... (Thomas)
0034  *              HP-Writers only ??? Maybe other CD-Writers work with this too ?
0035  *              HP 6020 writers now supported.
0036  */
0037
0038 #include <linux/cdrom.h>
0039 #include <linux/errno.h>
0040 #include <linux/string.h>
0041 #include <linux/bcd.h>
0042 #include <linux/blkdev.h>
0043 #include <linux/slab.h>
0044
0045 #include <scsi/scsi.h>
0046 #include <scsi/scsi_cmnd.h>
0047 #include <scsi/scsi_device.h>
0048 #include <scsi/scsi_host.h>
0049 #include <scsi/scsi_ioctl.h>
0050
0051 #include "sr.h"
0052
0053 #if 0
0054 #define DEBUG
0055 #endif
0056
0057 /* here are some constants to sort the vendors into groups */
0058
0059 #define VENDOR_SCSI3           1    /* default: scsi-3 mmc */
0060
0061 #define VENDOR_NEC             2
0062 #define VENDOR_TOSHIBA         3
0063 #define VENDOR_WRITER          4    /* pre-scsi3 writers */
0064 #define VENDOR_CYGNAL_85ED     5    /* CD-on-a-chip */
0065
0066 #define VENDOR_TIMEOUT  30*HZ
0067
0068 void sr_vendor_init(Scsi_CD *cd)
0069 {
0070     const char *vendor = cd->device->vendor;
0071     const char *model = cd->device->model;
0072
0073     /* default */
0074     cd->vendor = VENDOR_SCSI3;
0075     if (cd->readcd_known)
0076         /* this is true for scsi3/mmc drives - no more checks */
0077         return;
0078
0079     if (cd->device->type == TYPE_WORM) {
0080         cd->vendor = VENDOR_WRITER;
0081
0082     } else if (!strncmp(vendor, "NEC", 3)) {
0083         cd->vendor = VENDOR_NEC;
0084         if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
0085             !strncmp(model, "CD-ROM DRIVE:36", 15) ||
0086             !strncmp(model, "CD-ROM DRIVE:83", 15) ||
0087             !strncmp(model, "CD-ROM DRIVE:84 ", 16)
0088 #if 0
0089         /* my NEC 3x returns the read-raw data if a read-raw
0090            is followed by a read for the same sector - aeb */
0091             || !strncmp(model, "CD-ROM DRIVE:500", 16)
0092 #endif
0093             )
0094             /* these can't handle multisession, may hang */
0095             cd->cdi.mask |= CDC_MULTI_SESSION;
0096
0097     } else if (!strncmp(vendor, "TOSHIBA", 7)) {
0098         cd->vendor = VENDOR_TOSHIBA;
0099
0100     } else if (!strncmp(vendor, "Beurer", 6) &&
0101            !strncmp(model, "Gluco Memory", 12)) {
0102         /* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip
0103            that only accepts a subset of SCSI commands.  Most of the
0104            not-implemented commands are fine to fail, but a few,
0105            particularly around the MMC or Audio commands, will put the
0106            device into an unrecoverable state, so they need to be
0107            avoided at all costs.
0108         */
0109         cd->vendor = VENDOR_CYGNAL_85ED;
0110         cd->cdi.mask |= (
0111             CDC_MULTI_SESSION |
0112             CDC_CLOSE_TRAY | CDC_OPEN_TRAY |
0113             CDC_LOCK |
0114             CDC_GENERIC_PACKET |
0115             CDC_PLAY_AUDIO
0116             );
0117     }
0118 }
0119
0120
0121 /* small handy function for switching block length using MODE SELECT,
0122  * used by sr_read_sector() */
0123
0124 int sr_set_blocklength(Scsi_CD *cd, int blocklength)
0125 {
0126     unsigned char *buffer;  /* the buffer for the ioctl */
0127     struct packet_command cgc;
0128     struct ccs_modesel_head *modesel;
0129     int rc, density = 0;
0130
0131     if (cd->vendor == VENDOR_TOSHIBA)
0132         density = (blocklength > 2048) ? 0x81 : 0x83;
0133
0134     buffer = kmalloc(512, GFP_KERNEL);
0135     if (!buffer)
0136         return -ENOMEM;
0137
0138 #ifdef DEBUG
0139     sr_printk(KERN_INFO, cd, "MODE SELECT 0x%x/%d\n", density, blocklength);
0140 #endif
0141     memset(&cgc, 0, sizeof(struct packet_command));
0142     cgc.cmd[0] = MODE_SELECT;
0143     cgc.cmd[1] = (1 << 4);
0144     cgc.cmd[4] = 12;
0145     modesel = (struct ccs_modesel_head *) buffer;
0146     memset(modesel, 0, sizeof(*modesel));
0147     modesel->block_desc_length = 0x08;
0148     modesel->density = density;
0149     modesel->block_length_med = (blocklength >> 8) & 0xff;
0150     modesel->block_length_lo = blocklength & 0xff;
0151     cgc.buffer = buffer;
0152     cgc.buflen = sizeof(*modesel);
0153     cgc.data_direction = DMA_TO_DEVICE;
0154     cgc.timeout = VENDOR_TIMEOUT;
0155     if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
0156         cd->device->sector_size = blocklength;
0157     }
0158 #ifdef DEBUG
0159     else
0160         sr_printk(KERN_INFO, cd,
0161               "switching blocklength to %d bytes failed\n",
0162               blocklength);
0163 #endif
0164     kfree(buffer);
0165     return rc;
0166 }
0167
0168 /* This function gets called after a media change. Checks if the CD is
0169    multisession, asks for offset etc. */
0170
0171 int sr_cd_check(struct cdrom_device_info *cdi)
0172 {
0173     Scsi_CD *cd = cdi->handle;
0174     unsigned long sector;
0175     unsigned char *buffer;  /* the buffer for the ioctl */
0176     struct packet_command cgc;
0177     int rc, no_multi;
0178
0179     if (cd->cdi.mask & CDC_MULTI_SESSION)
0180         return 0;
0181
0182     buffer = kmalloc(512, GFP_KERNEL);
0183     if (!buffer)
0184         return -ENOMEM;
0185
0186     sector = 0;     /* the multisession sector offset goes here  */
0187     no_multi = 0;       /* flag: the drive can't handle multisession */
0188     rc = 0;
0189
0190     memset(&cgc, 0, sizeof(struct packet_command));
0191
0192     switch (cd->vendor) {
0193
0194     case VENDOR_SCSI3:
0195         cgc.cmd[0] = READ_TOC;
0196         cgc.cmd[8] = 12;
0197         cgc.cmd[9] = 0x40;
0198         cgc.buffer = buffer;
0199         cgc.buflen = 12;
0200         cgc.quiet = 1;
0201         cgc.data_direction = DMA_FROM_DEVICE;
0202         cgc.timeout = VENDOR_TIMEOUT;
0203         rc = sr_do_ioctl(cd, &cgc);
0204         if (rc != 0)
0205             break;
0206         if ((buffer[0] << 8) + buffer[1] < 0x0a) {
0207             sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
0208                "doesn't support multisession CD's\n");
0209             no_multi = 1;
0210             break;
0211         }
0212         sector = buffer[11] + (buffer[10] << 8) +
0213             (buffer[9] << 16) + (buffer[8] << 24);
0214         if (buffer[6] <= 1) {
0215             /* ignore sector offsets from first track */
0216             sector = 0;
0217         }
0218         break;
0219
0220     case VENDOR_NEC:{
0221             unsigned long min, sec, frame;
0222             cgc.cmd[0] = 0xde;
0223             cgc.cmd[1] = 0x03;
0224             cgc.cmd[2] = 0xb0;
0225             cgc.buffer = buffer;
0226             cgc.buflen = 0x16;
0227             cgc.quiet = 1;
0228             cgc.data_direction = DMA_FROM_DEVICE;
0229             cgc.timeout = VENDOR_TIMEOUT;
0230             rc = sr_do_ioctl(cd, &cgc);
0231             if (rc != 0)
0232                 break;
0233             if (buffer[14] != 0 && buffer[14] != 0xb0) {
0234                 sr_printk(KERN_INFO, cd, "Hmm, seems the cdrom "
0235                       "doesn't support multisession CD's\n");
0236
0237                 no_multi = 1;
0238                 break;
0239             }
0240             min = bcd2bin(buffer[15]);
0241             sec = bcd2bin(buffer[16]);
0242             frame = bcd2bin(buffer[17]);
0243             sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
0244             break;
0245         }
0246
0247     case VENDOR_TOSHIBA:{
0248             unsigned long min, sec, frame;
0249
0250             /* we request some disc information (is it a XA-CD ?,
0251              * where starts the last session ?) */
0252             cgc.cmd[0] = 0xc7;
0253             cgc.cmd[1] = 0x03;
0254             cgc.buffer = buffer;
0255             cgc.buflen = 4;
0256             cgc.quiet = 1;
0257             cgc.data_direction = DMA_FROM_DEVICE;
0258             cgc.timeout = VENDOR_TIMEOUT;
0259             rc = sr_do_ioctl(cd, &cgc);
0260             if (rc == -EINVAL) {
0261                 sr_printk(KERN_INFO, cd, "Hmm, seems the drive "
0262                       "doesn't support multisession CD's\n");
0263                 no_multi = 1;
0264                 break;
0265             }
0266             if (rc != 0)
0267                 break;
0268             min = bcd2bin(buffer[1]);
0269             sec = bcd2bin(buffer[2]);
0270             frame = bcd2bin(buffer[3]);
0271             sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
0272             if (sector)
0273                 sector -= CD_MSF_OFFSET;
0274             sr_set_blocklength(cd, 2048);
0275             break;
0276         }
0277
0278     case VENDOR_WRITER:
0279         cgc.cmd[0] = READ_TOC;
0280         cgc.cmd[8] = 0x04;
0281         cgc.cmd[9] = 0x40;
0282         cgc.buffer = buffer;
0283         cgc.buflen = 0x04;
0284         cgc.quiet = 1;
0285         cgc.data_direction = DMA_FROM_DEVICE;
0286         cgc.timeout = VENDOR_TIMEOUT;
0287         rc = sr_do_ioctl(cd, &cgc);
0288         if (rc != 0) {
0289             break;
0290         }
0291         if ((rc = buffer[2]) == 0) {
0292             sr_printk(KERN_WARNING, cd,
0293                   "No finished session\n");
0294             break;
0295         }
0296         cgc.cmd[0] = READ_TOC;  /* Read TOC */
0297         cgc.cmd[6] = rc & 0x7f; /* number of last session */
0298         cgc.cmd[8] = 0x0c;
0299         cgc.cmd[9] = 0x40;
0300         cgc.buffer = buffer;
0301         cgc.buflen = 12;
0302         cgc.quiet = 1;
0303         cgc.data_direction = DMA_FROM_DEVICE;
0304         cgc.timeout = VENDOR_TIMEOUT;
0305         rc = sr_do_ioctl(cd, &cgc);
0306         if (rc != 0) {
0307             break;
0308         }
0309         sector = buffer[11] + (buffer[10] << 8) +
0310             (buffer[9] << 16) + (buffer[8] << 24);
0311         break;
0312
0313     default:
0314         /* should not happen */
0315         sr_printk(KERN_WARNING, cd,
0316               "unknown vendor code (%i), not initialized ?\n",
0317               cd->vendor);
0318         sector = 0;
0319         no_multi = 1;
0320         break;
0321     }
0322     cd->ms_offset = sector;
0323     cd->xa_flag = 0;
0324     if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
0325         cd->xa_flag = 1;
0326
0327     if (2048 != cd->device->sector_size) {
0328         sr_set_blocklength(cd, 2048);
0329     }
0330     if (no_multi)
0331         cdi->mask |= CDC_MULTI_SESSION;
0332
0333 #ifdef DEBUG
0334     if (sector)
0335         sr_printk(KERN_DEBUG, cd, "multisession offset=%lu\n",
0336               sector);
0337 #endif
0338     kfree(buffer);
0339     return rc;
0340 }