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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 <kraxel@cs.tu-berlin.de>

 *

 * --------------------------------------------------------------------------

 *

 * 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 <thomas@cuivre.freenix.fr>

 *

 *   - 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/config.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/blk.h>

#include "scsi.h"

#include "hosts.h"

#include <scsi/scsi_ioctl.h>

#include <linux/cdrom.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_ID (scsi_CDs[minor].vendor)

void sr_vendor_init(int minor)

{

#ifndef CONFIG_BLK_DEV_SR_VENDOR

        VENDOR_ID = VENDOR_SCSI3;

#else

        char *vendor = scsi_CDs[minor].device->vendor;

        char *model = scsi_CDs[minor].device->model;

        /* default */

        VENDOR_ID = VENDOR_SCSI3;

        if (scsi_CDs[minor].readcd_known)

                /* this is true for scsi3/mmc drives - no more checks */

                return;

        if (scsi_CDs[minor].device->type == TYPE_WORM) {

                VENDOR_ID = VENDOR_WRITER;

        } else if (!strncmp(vendor, "NEC", 3)) {

                VENDOR_ID = 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 */

                        scsi_CDs[minor].cdi.mask |= CDC_MULTI_SESSION;

        } else if (!strncmp(vendor, "TOSHIBA", 7)) {

                VENDOR_ID = VENDOR_TOSHIBA;

        }

#endif

}

/* small handy function for switching block length using MODE SELECT,

 * used by sr_read_sector() */

int sr_set_blocklength(int minor, int blocklength)

{

        unsigned char *buffer;  /* the buffer for the ioctl */

        unsigned char cmd[MAX_COMMAND_SIZE];    /* the scsi-command */

        struct ccs_modesel_head *modesel;

        int rc, density = 0;

#ifdef CONFIG_BLK_DEV_SR_VENDOR

        if (VENDOR_ID == VENDOR_TOSHIBA)

                density = (blocklength > 2048) ? 0x81 : 0x83;

#endif

        buffer = (unsigned char *) scsi_malloc(512);

        if (!buffer)

                return -ENOMEM;

#ifdef DEBUG

        printk("sr%d: MODE SELECT 0x%x/%d\n", minor, density, blocklength);

#endif

        memset(cmd, 0, MAX_COMMAND_SIZE);

        cmd[0] = MODE_SELECT;

        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                 (scsi_CDs[minor].device->lun << 5) : 0;

        cmd[1] |= (1 << 4);

        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;

        if (0 == (rc = sr_do_ioctl(minor, cmd, buffer, sizeof(*modesel), 0, SCSI_DATA_WRITE, NULL))) {

                scsi_CDs[minor].device->sector_size = blocklength;

        }

#ifdef DEBUG

        else

                printk("sr%d: switching blocklength to %d bytes failed\n",

                       minor, blocklength);

#endif

        scsi_free(buffer, 512);

        return rc;

}

/* This function gets called after a media change. Checks if the CD is

   multisession, asks for offset etc. */

#define BCD_TO_BIN(x)    ((((int)x & 0xf0) >> 4)*10 + ((int)x & 0x0f))

int sr_cd_check(struct cdrom_device_info *cdi)

{

        unsigned long sector;

        unsigned char *buffer;  /* the buffer for the ioctl */

        unsigned char cmd[MAX_COMMAND_SIZE];    /* the scsi-command */

        int rc, no_multi, minor;

        minor = MINOR(cdi->dev);

        if (scsi_CDs[minor].cdi.mask & CDC_MULTI_SESSION)

                return 0;

        buffer = (unsigned char *) scsi_malloc(512);

        if (!buffer)

                return -ENOMEM;

        sector = 0;              /* the multisession sector offset goes here  */

        no_multi = 0;            /* flag: the drive can't handle multisession */

        rc = 0;

        switch (VENDOR_ID) {

        case VENDOR_SCSI3:

                memset(cmd, 0, MAX_COMMAND_SIZE);

                cmd[0] = READ_TOC;

                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                         (scsi_CDs[minor].device->lun << 5) : 0;

                cmd[8] = 12;

                cmd[9] = 0x40;

                rc = sr_do_ioctl(minor, cmd, buffer, 12, 1, SCSI_DATA_READ, NULL);

                if (rc != 0)

                        break;

                if ((buffer[0] << 8) + buffer[1] < 0x0a) {

                        printk(KERN_INFO "sr%d: Hmm, seems the drive "

                           "doesn't support multisession CD's\n", minor);

                        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;

                        memset(cmd, 0, MAX_COMMAND_SIZE);

                        cmd[0] = 0xde;

                        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                                 (scsi_CDs[minor].device->lun << 5) : 0;

                        cmd[1] |= 0x03;

                        cmd[2] = 0xb0;

                        rc = sr_do_ioctl(minor, cmd, buffer, 0x16, 1, SCSI_DATA_READ, NULL);

                        if (rc != 0)

                                break;

                        if (buffer[14] != 0 && buffer[14] != 0xb0) {

                                printk(KERN_INFO "sr%d: Hmm, seems the cdrom "

                                       "doesn't support multisession CD's\n", minor);

                                no_multi = 1;

                                break;

                        }

                        min = BCD_TO_BIN(buffer[15]);

                        sec = BCD_TO_BIN(buffer[16]);

                        frame = BCD_TO_BIN(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 ?) */

                        memset(cmd, 0, MAX_COMMAND_SIZE);

                        cmd[0] = 0xc7;

                        cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                                 (scsi_CDs[minor].device->lun << 5) : 0;

                        cmd[1] |= 0x03;

                        rc = sr_do_ioctl(minor, cmd, buffer, 4, 1, SCSI_DATA_READ, NULL);

                        if (rc == -EINVAL) {

                                printk(KERN_INFO "sr%d: Hmm, seems the drive "

                                       "doesn't support multisession CD's\n", minor);

                                no_multi = 1;

                                break;

                        }

                        if (rc != 0)

                                break;

                        min = BCD_TO_BIN(buffer[1]);

                        sec = BCD_TO_BIN(buffer[2]);

                        frame = BCD_TO_BIN(buffer[3]);

                        sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;

                        if (sector)

                                sector -= CD_MSF_OFFSET;

                        sr_set_blocklength(minor, 2048);

                        break;

                }

        case VENDOR_WRITER:

                memset(cmd, 0, MAX_COMMAND_SIZE);

                cmd[0] = READ_TOC;

                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                         (scsi_CDs[minor].device->lun << 5) : 0;

                cmd[8] = 0x04;

                cmd[9] = 0x40;

                rc = sr_do_ioctl(minor, cmd, buffer, 0x04, 1, SCSI_DATA_READ, NULL);

                if (rc != 0) {

                        break;

                }

                if ((rc = buffer[2]) == 0) {

                        printk(KERN_WARNING

                               "sr%d: No finished session\n", minor);

                        break;

                }

                cmd[0] = READ_TOC;       /* Read TOC */

                cmd[1] = (scsi_CDs[minor].device->scsi_level <= SCSI_2) ?

                         (scsi_CDs[minor].device->lun << 5) : 0;

                cmd[6] = rc & 0x7f;     /* number of last session */

                cmd[8] = 0x0c;

                cmd[9] = 0x40;

                rc = sr_do_ioctl(minor, cmd, buffer, 12, 1, SCSI_DATA_READ, NULL);

                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

                   "sr%d: unknown vendor code (%i), not initialized ?\n",

                       minor, VENDOR_ID);

                sector = 0;

                no_multi = 1;

                break;

        }

        scsi_CDs[minor].ms_offset = sector;

        scsi_CDs[minor].xa_flag = 0;

        if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(minor))

                scsi_CDs[minor].xa_flag = 1;

        if (2048 != scsi_CDs[minor].device->sector_size) {

                sr_set_blocklength(minor, 2048);

        }

        if (no_multi)

                cdi->mask |= CDC_MULTI_SESSION;

#ifdef DEBUG

        if (sector)

                printk(KERN_DEBUG "sr%d: multisession offset=%lu\n",

                       minor, sector);

#endif

        scsi_free(buffer, 512);

        return rc;

}