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lxdream.org :: lxdream/src/drivers/cd_linux.c
lxdream 0.9.1
released Jun 29
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filename src/drivers/cd_linux.c
changeset 767:53dc977f8f25
prev736:a02d1475ccfd
next777:60431d09605c
author nkeynes
date Thu Jul 24 02:31:56 2008 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix to correctly mount empty CD drives
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     1 /**
     2  * $Id$
     3  *
     4  * Linux cd-rom device driver. 
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    18 #include <unistd.h>
    19 #include <stdlib.h>
    20 #include <stdio.h>
    21 #include <string.h>
    22 #include <errno.h>
    23 #include <linux/cdrom.h>
    24 #include <sys/stat.h>
    25 #include <sys/ioctl.h>
    26 #include <fstab.h>
    27 #include <fcntl.h>
    29 #include "gdrom/gddriver.h"
    30 #include "gdrom/packet.h"
    31 #include "dream.h"
    33 #define MAXTOCENTRIES 600  /* This is a fairly generous overestimate really */
    34 #define MAXTOCSIZE 4 + (MAXTOCENTRIES*11)
    35 #define MAX_SECTORS_PER_CALL 1
    37 static uint32_t inline lbatomsf( uint32_t lba ) {
    38     union cdrom_addr addr;
    39     lba = lba + CD_MSF_OFFSET;
    40     addr.msf.frame = lba % CD_FRAMES;
    41     int seconds = lba / CD_FRAMES;
    42     addr.msf.second = seconds % CD_SECS;
    43     addr.msf.minute = seconds / CD_SECS;
    44     return addr.lba;
    45 }
    47 #define LBATOMSF( lba ) lbatomsf(lba)
    50 static gboolean linux_image_is_valid( FILE *f );
    51 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f );
    52 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc );
    53 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
    54                                         int mode, unsigned char *buf, uint32_t *length );
    55 static gdrom_error_t linux_send_command( int fd, char *cmd, unsigned char *buffer, size_t *buflen,
    56                                          int direction );
    57 static int linux_drive_status( gdrom_disc_t disc );
    59 struct gdrom_image_class cdrom_device_class = { "Linux", NULL,
    60         linux_image_is_valid, linux_open_device };
    61 GList *cdrom_get_native_devices(void)
    62 {
    63     GList *list = NULL;
    64     struct fstab *ent;
    65     struct stat st;
    66     setfsent();
    67     while( (ent = getfsent()) != NULL ) {
    68         if( (stat(ent->fs_spec, &st) != -1) && 
    69                 S_ISBLK(st.st_mode) ) {
    70             /* Got a valid block device - is it a CDROM? */
    71             int fd = open(ent->fs_spec, O_RDONLY|O_NONBLOCK);
    72             if( fd == -1 )
    73                 continue;
    74             int caps = ioctl(fd, CDROM_GET_CAPABILITY);
    75             if( caps != -1 ) {
    76                 /* Appears to support CDROM functions */
    77                 list = g_list_append( list, gdrom_device_new(ent->fs_spec, ent->fs_spec));
    78             }
    79             close(fd);
    80         }
    81     }
    82     return list;
    83 }
    85 gdrom_disc_t cdrom_open_device( const gchar *method, const gchar *path )
    86 {
    87     return NULL;
    88 }
    90 static gboolean linux_image_is_valid( FILE *f )
    91 {
    92     struct stat st;
    93     struct cdrom_tochdr tochdr;
    95     if( fstat(fileno(f), &st) == -1 ) {
    96         return FALSE; /* can't stat device? */
    97     }
    98     if( !S_ISBLK(st.st_mode) ) {
    99         return FALSE; /* Not a block device */
   100     }
   102     int caps = ioctl(fileno(f), CDROM_GET_CAPABILITY);
   103     if( caps == -1 ) {
   104         /* Quick check that this is really a CD device */
   105         return FALSE;
   106     }
   108     return TRUE;
   109 }
   111 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f ) 
   112 {
   113     gdrom_disc_t disc;
   115     disc = gdrom_image_new(filename, f);
   116     if( disc == NULL ) {
   117         ERROR("Unable to allocate memory!");
   118         return NULL;
   119     }
   121     int status = ioctl(fileno(f), CDROM_DRIVE_STATUS, CDSL_CURRENT);
   122     if( status == CDS_DISC_OK ) {
   123         status = linux_read_disc_toc( (gdrom_image_t)disc );
   124         if( status != 0 ) {
   125             gdrom_image_destroy_no_close(disc);
   126             if( status == 0xFFFF ) {
   127                 ERROR("Unable to load disc table of contents (%s)", strerror(errno));
   128             } else {
   129                 ERROR("Unable to load disc table of contents (sense %d,%d)",
   130                     status &0xFF, status >> 8 );
   131             }
   132             return NULL;
   133         }
   134     } else {
   135         ((gdrom_image_t)disc)->disc_type = IDE_DISC_NONE;
   136     }
   137     disc->read_sector = linux_read_sector;
   138     disc->drive_status = linux_drive_status;
   139     return disc;
   140 }
   142 static int linux_drive_status( gdrom_disc_t disc )
   143 {
   144     int fd = fileno(((gdrom_image_t)disc)->file);
   145     int status = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
   146     if( status == CDS_DISC_OK ) {
   147         status = ioctl(fd, CDROM_MEDIA_CHANGED, CDSL_CURRENT);
   148         if( status != 0 ) {
   149             linux_read_disc_toc( (gdrom_image_t)disc);
   150         }
   151         return ((gdrom_image_t)disc)->disc_type | IDE_DISC_READY;
   152     } else {
   153         return IDE_DISC_NONE;
   154     }
   155 }
   156 /**
   157  * Read the full table of contents into the disc from the device.
   158  */
   159 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc )
   160 {
   161     int fd = fileno(disc->file);
   162     unsigned char buf[MAXTOCSIZE];
   163     size_t buflen = sizeof(buf);
   164     char cmd[12] = { 0x43, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
   166     cmd[7] = (sizeof(buf))>>8;
   167     cmd[8] = (sizeof(buf))&0xFF;
   168     memset( buf, 0, sizeof(buf) );
   169     gdrom_error_t status = linux_send_command( fd, cmd, buf, &buflen, CGC_DATA_READ );
   170     if( status != 0 ) {
   171         return status;
   172     }
   173     mmc_parse_toc2( disc, buf );
   174     return 0;
   175 }
   177 gdrom_error_t linux_play_audio( gdrom_disc_t disc, uint32_t lba, uint32_t endlba )
   178 {
   179     int fd = fileno( ((gdrom_image_t)disc)->file );
   180     uint32_t real_sector = lba - CD_MSF_OFFSET;
   181     uint32_t length = endlba - lba;
   182     uint32_t buflen = 0;
   183     char cmd[12] = { 0xA5, 0,0,0, 0,0,0,0, 0,0,0,0 };
   184     cmd[2] = (real_sector >> 24) & 0xFF;
   185     cmd[3] = (real_sector >> 16) & 0xFF;
   186     cmd[4] = (real_sector >> 8) & 0xFF;
   187     cmd[5] = real_sector & 0xFF;
   188     cmd[6] = (length >> 24) & 0xFF;
   189     cmd[7] = (length >> 16) & 0xFF;
   190     cmd[8] = (length >> 8) & 0xFF;
   191     cmd[9] = length & 0xFF;
   193     return linux_send_command( fd, cmd, NULL, &buflen, CGC_DATA_NONE );
   194 }
   196 gdrom_error_t linux_stop_audio( gdrom_disc_t disc )
   197 {
   198     int fd = fileno( ((gdrom_image_t)disc)->file );
   199     uint32_t buflen = 0;
   200     char cmd[12] = {0x4E,0,0,0, 0,0,0,0, 0,0,0,0};
   201     return linux_send_command( fd, cmd, NULL, &buflen, CGC_DATA_NONE );
   202 }
   204 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
   205                                         int mode, unsigned char *buf, uint32_t *length )
   206 {
   207     gdrom_image_t image = (gdrom_image_t)disc;
   208     int fd = fileno(image->file);
   209     uint32_t real_sector = sector - CD_MSF_OFFSET;
   210     uint32_t sector_size = MAX_SECTOR_SIZE;
   211     char cmd[12];
   213     mmc_make_read_cd_cmd( cmd, real_sector, mode );
   215     gdrom_error_t status = linux_send_command( fd, cmd, buf, &sector_size, CGC_DATA_READ );
   216     if( status != 0 ) {
   217         return status;
   218     }
   219     *length = 2048;
   220     return 0;
   221 }
   223 /**
   224  * Send a packet command to the device and wait for a response. 
   225  * @return 0 on success, -1 on an operating system error, or a sense error
   226  * code on a device error.
   227  */
   228 static gdrom_error_t linux_send_command( int fd, char *cmd, unsigned char *buffer, size_t *buflen,
   229                                          int direction )
   230 {
   231     struct request_sense sense;
   232     struct cdrom_generic_command cgc;
   234     memset( &cgc, 0, sizeof(cgc) );
   235     memset( &sense, 0, sizeof(sense) );
   236     memcpy( cgc.cmd, cmd, 12 );
   237     cgc.buffer = buffer;
   238     cgc.buflen = *buflen;
   239     cgc.sense = &sense;
   240     cgc.data_direction = direction;
   242     if( ioctl(fd, CDROM_SEND_PACKET, &cgc) < 0 ) {
   243         if( sense.sense_key == 0 ) {
   244             return -1; 
   245         } else {
   246             /* TODO: Map newer codes back to the ones used by the gd-rom. */
   247             return sense.sense_key | (sense.asc<<8);
   248         }
   249     } else {
   250         *buflen = cgc.buflen;
   251         return 0;
   252     }
   253 }
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