/**

  * $Id$

  *

  * SCSI/MMC device interface (depends on lower-level SCSI transport)

  *

  * Copyright (c) 2009 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #include <string.h>

 #include "lxdream.h"

 #include "gettext.h"

 #include "gdrom/gddriver.h"

 #include "gdrom/packet.h"

 #define MAXTOCENTRIES 600  /* This is a fairly generous overestimate really */

 #define MAXTOCSIZE 4 + (MAXTOCENTRIES*11)

 #define MAX_SECTORS_PER_CALL 1

 #define MSFTOLBA( m,s,f ) (f + (s*CD_FRAMES_PER_SECOND) + (m*CD_FRAMES_PER_MINUTE))

 static void mmc_make_read_cd_cmd( char *cmd, uint32_t real_sector, int mode )

 {

     cmd[0] = 0xBE;

     cmd[1] = (mode & 0x0E) << 1;

     cmd[2] = (real_sector >> 24) & 0xFF;

     cmd[3] = (real_sector >> 16) & 0xFF;

     cmd[4] = (real_sector >> 8) & 0xFF;

     cmd[5] = real_sector & 0xFF;

     cmd[6] = 0;

     cmd[7] = 0;

     cmd[8] = 1;

     cmd[9] = 0;

     cmd[10]= 0;

     cmd[11]= 0;

     if( READ_CD_RAW(mode) ) {

         cmd[9] = 0xF0;

     } else {

         if( READ_CD_HEADER(mode) ) {

             cmd[9] = 0xA0;

         }

         if( READ_CD_SUBHEAD(mode) ) {

             cmd[9] |= 0x40;

         }

         if( READ_CD_DATA(mode) ) {

             cmd[9] |= 0x10;

         }

     }

 }

 /**

  * Parse the TOC (format 2) into the gdrom_disc structure

  */

 void mmc_parse_toc2( gdrom_disc_t disc, unsigned char *buf )

 {

     int max_track = 0;

     int last_track = -1;

     int leadout = -1;

     int len = (buf[0] << 8) | buf[1];

     int session_type = -1;

     int i;

     for( i = 4; i<len; i+=11 ) {

         int session = buf[i];

         int adr = buf[i+1] >> 4;

         int point = buf[i+3];

         if( adr == 0x01 && point > 0 && point < 100 ) {

             /* Track info */

             int trackno = point-1;

             if( point > max_track ) {

                 max_track = point;

             }

             disc->track[trackno].flags = (buf[i+1] & 0x0F) << 4;

             disc->track[trackno].session = session - 1;

             disc->track[trackno].lba = MSFTOLBA(buf[i+8],buf[i+9],buf[i+10]);

             if( disc->track[trackno].flags & TRACK_DATA ) {

                 disc->track[trackno].mode = GDROM_MODE1;

             } else {

                 disc->track[trackno].mode = GDROM_CDDA;

             }

             if( last_track != -1 ) {

                 disc->track[last_track].sector_count = disc->track[trackno].lba -

                 disc->track[last_track].lba;

             }

             last_track = trackno;

         } else switch( (adr << 8) | point ) {

         case 0x1A0: /* session info */

             if( buf[i+9] == 0x20 ) {

                 session_type = IDE_DISC_CDROMXA;

             } else {

                 session_type = IDE_DISC_CDROM;

             }

             disc->disc_type = session_type;

             break;

         case 0x1A2: /* leadout */

             leadout = MSFTOLBA(buf[i+8], buf[i+9], buf[i+10]);

             break;

         }

     }

     disc->track_count = max_track;

     if( leadout != -1 && last_track != -1 ) {

         disc->track[last_track].sector_count = leadout - disc->track[last_track].lba;

     }

 }

 /**

  * Construct a drive indentification string based on the response to the

  * INQUIRY command. On success, the disc display_name is updated with the

  * drive name, otherwise the display_name is unchanged.

  * @return PKT_ERR_OK on success, otherwise the host failure code.

  */

 static gdrom_error_t gdrom_scsi_identify_drive( gdrom_disc_t disc )

 {

     unsigned char ident[256];

     uint32_t identlen = 256;

     char cmd[12] = {0x12,0,0,0, 0xFF,0,0,0, 0,0,0,0};

     gdrom_error_t status = SCSI_TRANSPORT(disc)->packet_read( disc, cmd, ident, &identlen );

     if( status == PKT_ERR_OK ) {

         char vendorid[9];

         char productid[17];

         char productrev[5];

         memcpy( vendorid, ident+8, 8 ); vendorid[8] = 0;

         memcpy( productid, ident+16, 16 ); productid[16] = 0;

         memcpy( productrev, ident+32, 4 ); productrev[4] = 0;

        	g_free( (char *)disc->display_name );

         disc->display_name = g_strdup_printf( "%.8s %.16s %.4s", g_strstrip(vendorid), 

                   g_strstrip(productid), g_strstrip(productrev) );

     }

     return status;

 }

 static gdrom_error_t gdrom_scsi_read_sector( gdrom_disc_t disc, uint32_t sector,

                                         int mode, unsigned char *buf, uint32_t *length )

 {

     uint32_t real_sector = sector - GDROM_PREGAP;

     uint32_t sector_size = MAX_SECTOR_SIZE;

     char cmd[12];

     mmc_make_read_cd_cmd( cmd, real_sector, mode );

     gdrom_error_t status = SCSI_TRANSPORT(disc)->packet_read( disc, cmd, buf, &sector_size );

     if( status != 0 ) {

         return status;

     }

     /* FIXME */

     *length = 2048;

     return 0;

 }

 /**

  * Read the full table of contents into the disc from the device.

  */

 static gdrom_error_t gdrom_scsi_read_toc( gdrom_disc_t disc )

 {

     unsigned char buf[MAXTOCSIZE];

     uint32_t buflen = sizeof(buf);

     char cmd[12] = { 0x43, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

     cmd[7] = (sizeof(buf))>>8;

     cmd[8] = (sizeof(buf))&0xFF;

     memset( buf, 0, sizeof(buf) );

     gdrom_error_t status = SCSI_TRANSPORT(disc)->packet_read(disc, cmd, buf, &buflen );

     if( status == PKT_ERR_OK ) {

 	    mmc_parse_toc2( disc, buf );	

     } else {

     	if( status & 0xFF != 0x02 ) {

     	    /* Sense key 2 == Not Ready (ie temporary failure). Just ignore and

     	     * consider the drive empty for now, but warn about any other errors

     	     * we get. */

     	    WARN( _("Unable to read disc table of contents (error %04x)"), status );

     	}

     	disc->disc_type = IDE_DISC_NONE;

     }

     return status;

 }

 static gboolean gdrom_scsi_check_status( gdrom_disc_t disc )

 {

 	if( SCSI_TRANSPORT(disc)->media_changed(disc) ) {

 		gdrom_scsi_read_toc(disc);

 		return TRUE;

 	} else {

 		return FALSE;

 	}

 }

 static gdrom_error_t gdrom_scsi_play_audio( gdrom_disc_t disc, uint32_t lba, uint32_t endlba )

 {

     uint32_t real_sector = lba - GDROM_PREGAP;

     uint32_t length = endlba - lba;

     char cmd[12] = { 0xA5, 0,0,0, 0,0,0,0, 0,0,0,0 };

     cmd[2] = (real_sector >> 24) & 0xFF;

     cmd[3] = (real_sector >> 16) & 0xFF;

     cmd[4] = (real_sector >> 8) & 0xFF;

     cmd[5] = real_sector & 0xFF;

     cmd[6] = (length >> 24) & 0xFF;

     cmd[7] = (length >> 16) & 0xFF;

     cmd[8] = (length >> 8) & 0xFF;

     cmd[9] = length & 0xFF;

     return SCSI_TRANSPORT(disc)->packet_cmd( disc, cmd );

 }

 gdrom_error_t gdrom_scsi_stop_audio( gdrom_disc_t disc )

 {

     int fd = fileno(disc->file);

     uint32_t buflen = 0;

     char cmd[12] = {0x4E,0,0,0, 0,0,0,0, 0,0,0,0};

     return SCSI_TRANSPORT(disc)->packet_cmd( disc, cmd );

 }

 gdrom_disc_t gdrom_scsi_disc_new( const gchar *filename, FILE *f, gdrom_scsi_transport_t scsi )

 {

 	gdrom_disc_t disc = gdrom_disc_new(filename,f);

     if( disc != NULL ) {

 	    /* Initialize */

     	disc->impl_data = scsi;

     	disc->check_status = gdrom_scsi_check_status;

     	disc->read_sector = gdrom_scsi_read_sector;

     	disc->play_audio = gdrom_scsi_play_audio;

     	disc->run_time_slice = NULL;

     	gdrom_scsi_identify_drive(disc);

     	gdrom_scsi_read_toc(disc);

     }

     return disc;

 }