sr_vendor.c

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/* -*-linux-c-*-

 * vendor-specific code for SCSI CD-ROM's goes here.
 *
 * This is needed becauce most of the new features (multisession and
 * the like) are too new to be included into the SCSI-II standard (to
 * be exact: there is'nt anything in my draft copy).
 *
 * Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
 *           multisession using the READ TOC command (like SONY).
 *
 *           Rearranged stuff here: SCSI-3 is included allways, support
 *           for NEC/TOSHIBA/HP commands is optional.
 *
 *   Gerd Knorr <[email protected]> 
 *
 * --------------------------------------------------------------------------
 *
 * support for XA/multisession-CD's
 * 
 *   - NEC:     Detection and support of multisession CD's.
 *     
 *   - TOSHIBA: Detection and support of multisession CD's.
 *              Some XA-Sector tweaking, required for older drives.
 *
 *   - SONY:    Detection and support of multisession CD's.
 *              added by Thomas Quinot <[email protected]>
 *
 *   - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
 *              work with SONY (SCSI3 now)  code.
 *
 *   - HP:      Much like SONY, but a little different... (Thomas)
 *              HP-Writers only ??? Maybe other CD-Writers work with this too ?
 *              HP 6020 writers now supported.
 */

#include <linux/cdrom.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/bcd.h>
#include <linux/blkdev.h>
#include <linux/slab.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>

#include "sr.h"

#if 0
#define DEBUG
#endif

/* here are some constants to sort the vendors into groups */

#define VENDOR_SCSI3           1    /* default: scsi-3 mmc */

#define VENDOR_NEC             2
#define VENDOR_TOSHIBA         3
#define VENDOR_WRITER          4    /* pre-scsi3 writers */

#define VENDOR_TIMEOUT  30*HZ

void sr_vendor_init(Scsi_CD *cd)
{
#ifndef CONFIG_BLK_DEV_SR_VENDOR
    cd->vendor = VENDOR_SCSI3;
#else
    const char *vendor = cd->device->vendor;
    const char *model = cd->device->model;
    
    /* default */
    cd->vendor = VENDOR_SCSI3;
    if (cd->readcd_known)
        /* this is true for scsi3/mmc drives - no more checks */
        return;

    if (cd->device->type == TYPE_WORM) {
        cd->vendor = VENDOR_WRITER;

    } else if (!strncmp(vendor, "NEC", 3)) {
        cd->vendor = VENDOR_NEC;
        if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
            !strncmp(model, "CD-ROM DRIVE:36", 15) ||
            !strncmp(model, "CD-ROM DRIVE:83", 15) ||
            !strncmp(model, "CD-ROM DRIVE:84 ", 16)
#if 0
        /* my NEC 3x returns the read-raw data if a read-raw
           is followed by a read for the same sector - aeb */
            || !strncmp(model, "CD-ROM DRIVE:500", 16)
#endif
            )
            /* these can't handle multisession, may hang */
            cd->cdi.mask |= CDC_MULTI_SESSION;

    } else if (!strncmp(vendor, "TOSHIBA", 7)) {
        cd->vendor = VENDOR_TOSHIBA;

    }
#endif
}


/* small handy function for switching block length using MODE SELECT,
 * used by sr_read_sector() */

int sr_set_blocklength(Scsi_CD *cd, int blocklength)
{
    unsigned char *buffer;  /* the buffer for the ioctl */
    struct packet_command cgc;
    struct ccs_modesel_head *modesel;
    int rc, density = 0;

#ifdef CONFIG_BLK_DEV_SR_VENDOR
    if (cd->vendor == VENDOR_TOSHIBA)
        density = (blocklength > 2048) ? 0x81 : 0x83;
#endif

    buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
    if (!buffer)
        return -ENOMEM;

#ifdef DEBUG
    printk("%s: MODE SELECT 0x%x/%d\n", cd->cdi.name, density, blocklength);
#endif
    memset(&cgc, 0, sizeof(struct packet_command));
    cgc.cmd[0] = MODE_SELECT;
    cgc.cmd[1] = (1 << 4);
    cgc.cmd[4] = 12;
    modesel = (struct ccs_modesel_head *) buffer;
    memset(modesel, 0, sizeof(*modesel));
    modesel->block_desc_length = 0x08;
    modesel->density = density;
    modesel->block_length_med = (blocklength >> 8) & 0xff;
    modesel->block_length_lo = blocklength & 0xff;
    cgc.buffer = buffer;
    cgc.buflen = sizeof(*modesel);
    cgc.data_direction = DMA_TO_DEVICE;
    cgc.timeout = VENDOR_TIMEOUT;
    if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
        cd->device->sector_size = blocklength;
    }
#ifdef DEBUG
    else
        printk("%s: switching blocklength to %d bytes failed\n",
               cd->cdi.name, blocklength);
#endif
    kfree(buffer);
    return rc;
}

/* This function gets called after a media change. Checks if the CD is
   multisession, asks for offset etc. */

int sr_cd_check(struct cdrom_device_info *cdi)
{
    Scsi_CD *cd = cdi->handle;
    unsigned long sector;
    unsigned char *buffer;  /* the buffer for the ioctl */
    struct packet_command cgc;
    int rc, no_multi;

    if (cd->cdi.mask & CDC_MULTI_SESSION)
        return 0;

    buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
    if (!buffer)
        return -ENOMEM;

    sector = 0;     /* the multisession sector offset goes here  */
    no_multi = 0;       /* flag: the drive can't handle multisession */
    rc = 0;

    memset(&cgc, 0, sizeof(struct packet_command));

    switch (cd->vendor) {

    case VENDOR_SCSI3:
        cgc.cmd[0] = READ_TOC;
        cgc.cmd[8] = 12;
        cgc.cmd[9] = 0x40;
        cgc.buffer = buffer;
        cgc.buflen = 12;
        cgc.quiet = 1;
        cgc.data_direction = DMA_FROM_DEVICE;
        cgc.timeout = VENDOR_TIMEOUT;
        rc = sr_do_ioctl(cd, &cgc);
        if (rc != 0)
            break;
        if ((buffer[0] << 8) + buffer[1] < 0x0a) {
            printk(KERN_INFO "%s: Hmm, seems the drive "
               "doesn't support multisession CD's\n", cd->cdi.name);
            no_multi = 1;
            break;
        }
        sector = buffer[11] + (buffer[10] << 8) +
            (buffer[9] << 16) + (buffer[8] << 24);
        if (buffer[6] <= 1) {
            /* ignore sector offsets from first track */
            sector = 0;
        }
        break;

#ifdef CONFIG_BLK_DEV_SR_VENDOR
    case VENDOR_NEC:{
            unsigned long min, sec, frame;
            cgc.cmd[0] = 0xde;
            cgc.cmd[1] = 0x03;
            cgc.cmd[2] = 0xb0;
            cgc.buffer = buffer;
            cgc.buflen = 0x16;
            cgc.quiet = 1;
            cgc.data_direction = DMA_FROM_DEVICE;
            cgc.timeout = VENDOR_TIMEOUT;
            rc = sr_do_ioctl(cd, &cgc);
            if (rc != 0)
                break;
            if (buffer[14] != 0 && buffer[14] != 0xb0) {
                printk(KERN_INFO "%s: Hmm, seems the cdrom "
                       "doesn't support multisession CD's\n",
                       cd->cdi.name);
                no_multi = 1;
                break;
            }
            min = bcd2bin(buffer[15]);
            sec = bcd2bin(buffer[16]);
            frame = bcd2bin(buffer[17]);
            sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
            break;
        }

    case VENDOR_TOSHIBA:{
            unsigned long min, sec, frame;

            /* we request some disc information (is it a XA-CD ?,
             * where starts the last session ?) */
            cgc.cmd[0] = 0xc7;
            cgc.cmd[1] = 0x03;
            cgc.buffer = buffer;
            cgc.buflen = 4;
            cgc.quiet = 1;
            cgc.data_direction = DMA_FROM_DEVICE;
            cgc.timeout = VENDOR_TIMEOUT;
            rc = sr_do_ioctl(cd, &cgc);
            if (rc == -EINVAL) {
                printk(KERN_INFO "%s: Hmm, seems the drive "
                       "doesn't support multisession CD's\n",
                       cd->cdi.name);
                no_multi = 1;
                break;
            }
            if (rc != 0)
                break;
            min = bcd2bin(buffer[1]);
            sec = bcd2bin(buffer[2]);
            frame = bcd2bin(buffer[3]);
            sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
            if (sector)
                sector -= CD_MSF_OFFSET;
            sr_set_blocklength(cd, 2048);
            break;
        }

    case VENDOR_WRITER:
        cgc.cmd[0] = READ_TOC;
        cgc.cmd[8] = 0x04;
        cgc.cmd[9] = 0x40;
        cgc.buffer = buffer;
        cgc.buflen = 0x04;
        cgc.quiet = 1;
        cgc.data_direction = DMA_FROM_DEVICE;
        cgc.timeout = VENDOR_TIMEOUT;
        rc = sr_do_ioctl(cd, &cgc);
        if (rc != 0) {
            break;
        }
        if ((rc = buffer[2]) == 0) {
            printk(KERN_WARNING
                   "%s: No finished session\n", cd->cdi.name);
            break;
        }
        cgc.cmd[0] = READ_TOC;  /* Read TOC */
        cgc.cmd[6] = rc & 0x7f; /* number of last session */
        cgc.cmd[8] = 0x0c;
        cgc.cmd[9] = 0x40;
        cgc.buffer = buffer;
        cgc.buflen = 12;
        cgc.quiet = 1;
        cgc.data_direction = DMA_FROM_DEVICE;
        cgc.timeout = VENDOR_TIMEOUT;
        rc = sr_do_ioctl(cd, &cgc);
        if (rc != 0) {
            break;
        }
        sector = buffer[11] + (buffer[10] << 8) +
            (buffer[9] << 16) + (buffer[8] << 24);
        break;
#endif              /* CONFIG_BLK_DEV_SR_VENDOR */

    default:
        /* should not happen */
        printk(KERN_WARNING
           "%s: unknown vendor code (%i), not initialized ?\n",
               cd->cdi.name, cd->vendor);
        sector = 0;
        no_multi = 1;
        break;
    }
    cd->ms_offset = sector;
    cd->xa_flag = 0;
    if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
        cd->xa_flag = 1;

    if (2048 != cd->device->sector_size) {
        sr_set_blocklength(cd, 2048);
    }
    if (no_multi)
        cdi->mask |= CDC_MULTI_SESSION;

#ifdef DEBUG
    if (sector)
        printk(KERN_DEBUG "%s: multisession offset=%lu\n",
               cd->cdi.name, sector);
#endif
    kfree(buffer);
    return rc;
}