nkeynes@237 | 1 | /**
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nkeynes@237 | 2 | * $Id: linux.c,v 1.1 2006-12-14 12:31:38 nkeynes Exp $
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nkeynes@237 | 3 | *
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nkeynes@237 | 4 | * Linux cd-rom device driver
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nkeynes@237 | 5 | *
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nkeynes@237 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@237 | 7 | *
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nkeynes@237 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@237 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@237 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@237 | 11 | * (at your option) any later version.
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nkeynes@237 | 12 | *
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nkeynes@237 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@237 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@237 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@237 | 16 | * GNU General Public License for more details.
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nkeynes@237 | 17 | */
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nkeynes@237 | 18 | #include <stdlib.h>
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nkeynes@237 | 19 | #include <stdio.h>
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nkeynes@237 | 20 | #include <string.h>
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nkeynes@237 | 21 | #include <errno.h>
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nkeynes@237 | 22 | #include <linux/cdrom.h>
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nkeynes@237 | 23 | #include <sys/stat.h>
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nkeynes@237 | 24 | #include <sys/ioctl.h>
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nkeynes@237 | 25 |
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nkeynes@237 | 26 | #include "gdrom/gdrom.h"
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nkeynes@237 | 27 | #include "gdrom/packet.h"
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nkeynes@237 | 28 | #include "dream.h"
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nkeynes@237 | 29 |
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nkeynes@237 | 30 | #define MAXTOCENTRIES 600 /* This is a fairly generous overestimate really */
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nkeynes@237 | 31 | #define MAXTOCSIZE 4 + (MAXTOCENTRIES*11)
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nkeynes@237 | 32 |
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nkeynes@237 | 33 | #define MSFTOLBA( m,s,f ) (f + (s*CD_FRAMES) + (m*CD_FRAMES*CD_SECS))
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nkeynes@237 | 34 |
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nkeynes@237 | 35 | static uint32_t inline lbatomsf( uint32_t lba ) {
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nkeynes@237 | 36 | union cdrom_addr addr;
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nkeynes@237 | 37 | lba = lba + CD_MSF_OFFSET;
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nkeynes@237 | 38 | addr.msf.frame = lba % CD_FRAMES;
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nkeynes@237 | 39 | int seconds = lba / CD_FRAMES;
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nkeynes@237 | 40 | addr.msf.second = seconds % CD_SECS;
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nkeynes@237 | 41 | addr.msf.minute = seconds / CD_SECS;
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nkeynes@237 | 42 | return addr.lba;
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nkeynes@237 | 43 | }
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nkeynes@237 | 44 |
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nkeynes@237 | 45 | #define LBATOMSF( lba ) lbatomsf(lba)
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nkeynes@237 | 46 |
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nkeynes@237 | 47 |
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nkeynes@237 | 48 | static gboolean linux_image_is_valid( FILE *f );
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nkeynes@237 | 49 | static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f );
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nkeynes@237 | 50 | static gdrom_error_t linux_read_disc_toc( gdrom_disc_t disc );
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nkeynes@237 | 51 | static gdrom_error_t linux_read_sectors( gdrom_disc_t disc, uint32_t sector,
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nkeynes@237 | 52 | uint32_t sector_count, int mode, char *buf,
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nkeynes@237 | 53 | uint32_t *length );
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nkeynes@237 | 54 | static gdrom_error_t linux_send_command( int fd, char *cmd, char *buffer, size_t buflen,
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nkeynes@237 | 55 | int direction );
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nkeynes@237 | 56 |
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nkeynes@237 | 57 |
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nkeynes@237 | 58 | struct gdrom_image_class linux_device_class = { "Linux", NULL,
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nkeynes@237 | 59 | linux_image_is_valid, linux_open_device };
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nkeynes@237 | 60 |
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nkeynes@237 | 61 | static gboolean linux_image_is_valid( FILE *f )
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nkeynes@237 | 62 | {
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nkeynes@237 | 63 | struct stat st;
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nkeynes@237 | 64 | struct cdrom_tochdr tochdr;
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nkeynes@237 | 65 |
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nkeynes@237 | 66 | if( fstat(fileno(f), &st) == -1 ) {
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nkeynes@237 | 67 | return FALSE; /* can't stat device? */
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nkeynes@237 | 68 | }
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nkeynes@237 | 69 | if( !S_ISBLK(st.st_mode) ) {
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nkeynes@237 | 70 | return FALSE; /* Not a block device */
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nkeynes@237 | 71 | }
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nkeynes@237 | 72 |
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nkeynes@237 | 73 | if( ioctl(fileno(f), CDROMREADTOCHDR, &tochdr) == -1 ) {
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nkeynes@237 | 74 | /* Quick check that this is really a CD */
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nkeynes@237 | 75 | return FALSE;
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nkeynes@237 | 76 | }
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nkeynes@237 | 77 |
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nkeynes@237 | 78 | return TRUE;
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nkeynes@237 | 79 | }
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nkeynes@237 | 80 |
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nkeynes@237 | 81 | static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f )
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nkeynes@237 | 82 | {
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nkeynes@237 | 83 | gdrom_disc_t disc;
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nkeynes@237 | 84 | int fd = fileno(f);
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nkeynes@237 | 85 |
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nkeynes@237 | 86 | disc = gdrom_image_new(f);
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nkeynes@237 | 87 | if( disc == NULL ) {
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nkeynes@237 | 88 | ERROR("Unable to allocate memory!");
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nkeynes@237 | 89 | return NULL;
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nkeynes@237 | 90 | }
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nkeynes@237 | 91 |
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nkeynes@237 | 92 | gdrom_error_t status = linux_read_disc_toc( disc );
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nkeynes@237 | 93 | if( status != 0 ) {
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nkeynes@237 | 94 | free(disc);
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nkeynes@237 | 95 | if( status == 0xFFFF ) {
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nkeynes@237 | 96 | ERROR("Unable to load disc table of contents (%s)", strerror(errno));
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nkeynes@237 | 97 | } else {
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nkeynes@237 | 98 | ERROR("Unable to load disc table of contents (sense %d,%d)",
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nkeynes@237 | 99 | status &0xFF, status >> 8 );
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nkeynes@237 | 100 | }
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nkeynes@237 | 101 | return NULL;
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nkeynes@237 | 102 | }
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nkeynes@237 | 103 | disc->read_sectors = linux_read_sectors;
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nkeynes@237 | 104 | disc->disc_type = IDE_DISC_CDROM;
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nkeynes@237 | 105 | return disc;
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nkeynes@237 | 106 | }
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nkeynes@237 | 107 |
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nkeynes@237 | 108 | /**
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nkeynes@237 | 109 | * Read the full table of contents into the disc from the device.
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nkeynes@237 | 110 | */
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nkeynes@237 | 111 | static gdrom_error_t linux_read_disc_toc( gdrom_disc_t disc )
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nkeynes@237 | 112 | {
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nkeynes@237 | 113 | int fd = fileno(disc->file);
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nkeynes@237 | 114 | unsigned char buf[MAXTOCSIZE];
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nkeynes@237 | 115 | char cmd[12] = { 0x43, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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nkeynes@237 | 116 |
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nkeynes@237 | 117 | cmd[7] = (sizeof(buf))>>8;
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nkeynes@237 | 118 | cmd[8] = (sizeof(buf))&0xFF;
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nkeynes@237 | 119 | memset( buf, 0, sizeof(buf) );
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nkeynes@237 | 120 | gdrom_error_t status = linux_send_command( fd, cmd, buf, sizeof(buf), CGC_DATA_READ );
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nkeynes@237 | 121 | if( status != 0 ) {
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nkeynes@237 | 122 | return status;
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nkeynes@237 | 123 | }
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nkeynes@237 | 124 |
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nkeynes@237 | 125 | int max_track = 0;
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nkeynes@237 | 126 | int last_track = -1;
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nkeynes@237 | 127 | int leadout = -1;
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nkeynes@237 | 128 | int len = (buf[0] << 8) | buf[1];
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nkeynes@237 | 129 | int session_type = GDROM_MODE1;
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nkeynes@237 | 130 | int i;
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nkeynes@237 | 131 | for( i = 4; i<len; i+=11 ) {
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nkeynes@237 | 132 | int session = buf[i];
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nkeynes@237 | 133 | int adr = buf[i+1] >> 4;
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nkeynes@237 | 134 | int point = buf[i+3];
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nkeynes@237 | 135 | if( adr == 0x01 && point > 0 && point < 100 ) {
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nkeynes@237 | 136 | /* Track info */
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nkeynes@237 | 137 | int trackno = point-1;
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nkeynes@237 | 138 | if( point > max_track ) {
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nkeynes@237 | 139 | max_track = point;
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nkeynes@237 | 140 | }
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nkeynes@237 | 141 | disc->track[trackno].flags = (buf[i+1] & 0x0F) << 4;
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nkeynes@237 | 142 | disc->track[trackno].session = session - 1;
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nkeynes@237 | 143 | disc->track[trackno].lba = MSFTOLBA(buf[i+8],buf[i+9],buf[i+10]);
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nkeynes@237 | 144 | if( disc->track[trackno].flags & TRACK_DATA ) {
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nkeynes@237 | 145 | disc->track[trackno].mode = GDROM_MODE1;
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nkeynes@237 | 146 | } else {
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nkeynes@237 | 147 | disc->track[trackno].mode = GDROM_CDDA;
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nkeynes@237 | 148 | }
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nkeynes@237 | 149 | if( last_track != -1 ) {
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nkeynes@237 | 150 | disc->track[last_track].sector_count = disc->track[trackno].lba -
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nkeynes@237 | 151 | disc->track[last_track].lba;
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nkeynes@237 | 152 | }
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nkeynes@237 | 153 | last_track = trackno;
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nkeynes@237 | 154 | } else switch( (adr << 8) | point ) {
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nkeynes@237 | 155 | case 0x1A0: /* session info */
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nkeynes@237 | 156 | if( buf[i+9] == 0x20 ) {
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nkeynes@237 | 157 | session_type = GDROM_MODE2;
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nkeynes@237 | 158 | } else {
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nkeynes@237 | 159 | session_type = GDROM_MODE1;
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nkeynes@237 | 160 | }
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nkeynes@237 | 161 | case 0x1A2: /* leadout */
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nkeynes@237 | 162 | leadout = MSFTOLBA(buf[i+8], buf[i+9], buf[i+10]);
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nkeynes@237 | 163 | break;
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nkeynes@237 | 164 | }
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nkeynes@237 | 165 | }
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nkeynes@237 | 166 | disc->track_count = max_track;
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nkeynes@237 | 167 |
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nkeynes@237 | 168 | if( leadout != -1 && last_track != -1 ) {
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nkeynes@237 | 169 | disc->track[last_track].sector_count = leadout - disc->track[last_track].lba;
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nkeynes@237 | 170 | }
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nkeynes@237 | 171 | return 0;
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nkeynes@237 | 172 | }
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nkeynes@237 | 173 |
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nkeynes@237 | 174 | static gdrom_error_t linux_read_sectors_ioctl( gdrom_disc_t disc, uint32_t sector,
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nkeynes@237 | 175 | uint32_t sector_count, int mode, char *buf,
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nkeynes@237 | 176 | uint32_t *length )
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nkeynes@237 | 177 | {
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nkeynes@237 | 178 | int fd = fileno(disc->file);
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nkeynes@237 | 179 | int call;
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nkeynes@237 | 180 | struct cdrom_read read;
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nkeynes@237 | 181 | read.cdread_lba = LBATOMSF(sector);
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nkeynes@237 | 182 | read.cdread_bufaddr = buf;
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nkeynes@237 | 183 | switch(mode) {
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nkeynes@237 | 184 | case GDROM_MODE1:
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nkeynes@237 | 185 | call = CDROMREADMODE1;
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nkeynes@237 | 186 | read.cdread_buflen = sector_count * 2048;
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nkeynes@237 | 187 | break;
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nkeynes@237 | 188 | case GDROM_MODE2:
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nkeynes@237 | 189 | call = CDROMREADMODE2;
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nkeynes@237 | 190 | read.cdread_buflen = sector_count * 2336;
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nkeynes@237 | 191 | break;
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nkeynes@237 | 192 | default:
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nkeynes@237 | 193 | return PKT_ERR_BADREADMODE;
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nkeynes@237 | 194 | }
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nkeynes@237 | 195 |
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nkeynes@237 | 196 | if( ioctl( fd, call, &read ) == -1 ) {
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nkeynes@237 | 197 | ERROR( "Error reading disc (%s)", strerror(errno) );
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nkeynes@237 | 198 | return PKT_ERR_BADREAD;
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nkeynes@237 | 199 | }
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nkeynes@237 | 200 | *length = read.cdread_buflen;
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nkeynes@237 | 201 | return PKT_ERR_OK;
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nkeynes@237 | 202 | }
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nkeynes@237 | 203 |
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nkeynes@237 | 204 | static gdrom_error_t linux_read_sectors( gdrom_disc_t disc, uint32_t sector,
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nkeynes@237 | 205 | uint32_t sector_count, int mode, char *buf,
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nkeynes@237 | 206 | uint32_t *length )
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nkeynes@237 | 207 | {
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nkeynes@237 | 208 | int fd = fileno(disc->file);
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nkeynes@237 | 209 | uint32_t real_sector = sector - CD_MSF_OFFSET;
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nkeynes@237 | 210 | int buflen = sector_count * 2048;
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nkeynes@237 | 211 | char cmd[12] = { 0xBE, 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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nkeynes@237 | 212 | cmd[2] = (real_sector >> 24) & 0xFF;
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nkeynes@237 | 213 | cmd[3] = (real_sector >> 16) & 0xFF;
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nkeynes@237 | 214 | cmd[4] = (real_sector >> 8) & 0xFF;
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nkeynes@237 | 215 | cmd[5] = real_sector & 0xFF;
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nkeynes@237 | 216 | cmd[6] = (sector_count >> 16) & 0xFF;
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nkeynes@237 | 217 | cmd[7] = (sector_count >> 8) & 0xFF;
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nkeynes@237 | 218 | cmd[8] = sector_count & 0xFF;
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nkeynes@237 | 219 | cmd[9] = 0x10;
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nkeynes@237 | 220 |
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nkeynes@237 | 221 | gdrom_error_t status = linux_send_command( fd, cmd, buf, buflen, CGC_DATA_READ );
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nkeynes@237 | 222 | if( status == 0 ) {
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nkeynes@237 | 223 | *length = buflen;
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nkeynes@237 | 224 | }
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nkeynes@237 | 225 | return status;
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nkeynes@237 | 226 | }
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nkeynes@237 | 227 |
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nkeynes@237 | 228 | /**
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nkeynes@237 | 229 | * Send a packet command to the device and wait for a response.
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nkeynes@237 | 230 | * @return 0 on success, -1 on an operating system error, or a sense error
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nkeynes@237 | 231 | * code on a device error.
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nkeynes@237 | 232 | */
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nkeynes@237 | 233 | static gdrom_error_t linux_send_command( int fd, char *cmd, char *buffer, size_t buflen,
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nkeynes@237 | 234 | int direction )
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nkeynes@237 | 235 | {
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nkeynes@237 | 236 | struct request_sense sense;
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nkeynes@237 | 237 | struct cdrom_generic_command cgc;
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nkeynes@237 | 238 |
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nkeynes@237 | 239 | memset( &cgc, 0, sizeof(cgc) );
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nkeynes@237 | 240 | memset( &sense, 0, sizeof(sense) );
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nkeynes@237 | 241 | memcpy( cgc.cmd, cmd, 12 );
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nkeynes@237 | 242 | cgc.buffer = buffer;
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nkeynes@237 | 243 | cgc.buflen = buflen;
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nkeynes@237 | 244 | cgc.sense = &sense;
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nkeynes@237 | 245 | cgc.data_direction = direction;
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nkeynes@237 | 246 |
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nkeynes@237 | 247 | if( ioctl(fd, CDROM_SEND_PACKET, &cgc) == -1 ) {
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nkeynes@237 | 248 | if( sense.sense_key == 0 ) {
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nkeynes@237 | 249 | return -1;
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nkeynes@237 | 250 | } else {
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nkeynes@237 | 251 | return sense.sense_key | (sense.asc<<8);
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nkeynes@237 | 252 | }
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nkeynes@237 | 253 | } else {
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nkeynes@237 | 254 | return 0;
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nkeynes@237 | 255 | }
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nkeynes@237 | 256 | }
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