include/linux/cdrom.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * -- <linux/cdrom.h>
   4  * General header file for linux CD-ROM drivers
   5  * Copyright (C) 1992         David Giller, rafetmad@oxy.edu
   6  *               1994, 1995   Eberhard Mönkeberg, emoenke@gwdg.de
   7  *               1996         David van Leeuwen, david@tm.tno.nl
   8  *               1997, 1998   Erik Andersen, andersee@debian.org
   9  *               1998-2002    Jens Axboe, axboe@suse.de
  10  */
  11 #ifndef _LINUX_CDROM_H
  12 #define _LINUX_CDROM_H
  13
  14 #include <linux/fs.h>           /* not really needed, later.. */
  15 #include <linux/list.h>
  16 #include <scsi/scsi_common.h>
  17 #include <uapi/linux/cdrom.h>
  18
  19 struct packet_command
  20 {
  21         unsigned char           cmd[CDROM_PACKET_SIZE];
  22         unsigned char           *buffer;
  23         unsigned int            buflen;
  24         int                     stat;
  25         struct scsi_sense_hdr   *sshdr;
  26         unsigned char           data_direction;
  27         int                     quiet;
  28         int                     timeout;
  29         void                    *reserved[1];
  30 };
  31
  32 /*
  33  * _OLD will use PIO transfer on atapi devices, _BPC_* will use DMA
  34  */
  35 #define CDDA_OLD                0       /* old style */
  36 #define CDDA_BPC_SINGLE         1       /* single frame block pc */
  37 #define CDDA_BPC_FULL           2       /* multi frame block pc */
  38
  39 /* Uniform cdrom data structures for cdrom.c */
  40 struct cdrom_device_info {
  41         const struct cdrom_device_ops *ops; /* link to device_ops */
  42         struct list_head list;          /* linked list of all device_info */
  43         struct gendisk *disk;           /* matching block layer disk */
  44         void *handle;                   /* driver-dependent data */
  45 /* specifications */
  46         int mask;                       /* mask of capability: disables them */
  47         int speed;                      /* maximum speed for reading data */
  48         int capacity;                   /* number of discs in jukebox */
  49 /* device-related storage */
  50         unsigned int options    : 30;   /* options flags */
  51         unsigned mc_flags       : 2;    /* media change buffer flags */
  52         unsigned int vfs_events;        /* cached events for vfs path */
  53         unsigned int ioctl_events;      /* cached events for ioctl path */
  54         int use_count;                  /* number of times device opened */
  55         char name[20];                  /* name of the device type */
  56 /* per-device flags */
  57         __u8 sanyo_slot         : 2;    /* Sanyo 3 CD changer support */
  58         __u8 keeplocked         : 1;    /* CDROM_LOCKDOOR status */
  59         __u8 reserved           : 5;    /* not used yet */
  60         int cdda_method;                /* see flags */
  61         __u8 last_sense;
  62         __u8 media_written;             /* dirty flag, DVD+RW bookkeeping */
  63         unsigned short mmc3_profile;    /* current MMC3 profile */
  64         int for_data;
  65         int (*exit)(struct cdrom_device_info *);
  66         int mrw_mode_page;
  67 };
  68
  69 struct cdrom_device_ops {
  70 /* routines */
  71         int (*open) (struct cdrom_device_info *, int);
  72         void (*release) (struct cdrom_device_info *);
  73         int (*drive_status) (struct cdrom_device_info *, int);
  74         unsigned int (*check_events) (struct cdrom_device_info *cdi,
  75                                       unsigned int clearing, int slot);
  76         int (*media_changed) (struct cdrom_device_info *, int);
  77         int (*tray_move) (struct cdrom_device_info *, int);
  78         int (*lock_door) (struct cdrom_device_info *, int);
  79         int (*select_speed) (struct cdrom_device_info *, int);
  80         int (*select_disc) (struct cdrom_device_info *, int);
  81         int (*get_last_session) (struct cdrom_device_info *,
  82                                  struct cdrom_multisession *);
  83         int (*get_mcn) (struct cdrom_device_info *,
  84                         struct cdrom_mcn *);
  85         /* hard reset device */
  86         int (*reset) (struct cdrom_device_info *);
  87         /* play stuff */
  88         int (*audio_ioctl) (struct cdrom_device_info *,unsigned int, void *);
  89
  90 /* driver specifications */
  91         const int capability;   /* capability flags */
  92         /* handle uniform packets for scsi type devices (scsi,atapi) */
  93         int (*generic_packet) (struct cdrom_device_info *,
  94                                struct packet_command *);
  95 };
  96
  97 /* the general block_device operations structure: */
  98 extern int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
  99                         fmode_t mode);
 100 extern void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode);
 101 extern int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
 102                        fmode_t mode, unsigned int cmd, unsigned long arg);
 103 extern unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
 104                                        unsigned int clearing);
 105 extern int cdrom_media_changed(struct cdrom_device_info *);
 106
 107 extern int register_cdrom(struct cdrom_device_info *cdi);
 108 extern void unregister_cdrom(struct cdrom_device_info *cdi);
 109
 110 typedef struct {
 111     int data;
 112     int audio;
 113     int cdi;
 114     int xa;
 115     long error;
 116 } tracktype;
 117
 118 extern int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written);
 119 extern int cdrom_number_of_slots(struct cdrom_device_info *cdi);
 120 extern int cdrom_mode_select(struct cdrom_device_info *cdi,
 121                              struct packet_command *cgc);
 122 extern int cdrom_mode_sense(struct cdrom_device_info *cdi,
 123                             struct packet_command *cgc,
 124                             int page_code, int page_control);
 125 extern void init_cdrom_command(struct packet_command *cgc,
 126                                void *buffer, int len, int type);
 127 extern int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
 128                                       struct packet_command *cgc);
 129
 130 /* The SCSI spec says there could be 256 slots. */
 131 #define CDROM_MAX_SLOTS 256
 132
 133 struct cdrom_mechstat_header {
 134 #if defined(__BIG_ENDIAN_BITFIELD)
 135         __u8 fault         : 1;
 136         __u8 changer_state : 2;
 137         __u8 curslot       : 5;
 138         __u8 mech_state    : 3;
 139         __u8 door_open     : 1;
 140         __u8 reserved1     : 4;
 141 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 142         __u8 curslot       : 5;
 143         __u8 changer_state : 2;
 144         __u8 fault         : 1;
 145         __u8 reserved1     : 4;
 146         __u8 door_open     : 1;
 147         __u8 mech_state    : 3;
 148 #endif
 149         __u8     curlba[3];
 150         __u8     nslots;
 151         __u16 slot_tablelen;
 152 };
 153
 154 struct cdrom_slot {
 155 #if defined(__BIG_ENDIAN_BITFIELD)
 156         __u8 disc_present : 1;
 157         __u8 reserved1    : 6;
 158         __u8 change       : 1;
 159 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 160         __u8 change       : 1;
 161         __u8 reserved1    : 6;
 162         __u8 disc_present : 1;
 163 #endif
 164         __u8 reserved2[3];
 165 };
 166
 167 struct cdrom_changer_info {
 168         struct cdrom_mechstat_header hdr;
 169         struct cdrom_slot slots[CDROM_MAX_SLOTS];
 170 };
 171
 172 typedef enum {
 173         mechtype_caddy = 0,
 174         mechtype_tray  = 1,
 175         mechtype_popup = 2,
 176         mechtype_individual_changer = 4,
 177         mechtype_cartridge_changer  = 5
 178 } mechtype_t;
 179
 180 typedef struct {
 181 #if defined(__BIG_ENDIAN_BITFIELD)
 182         __u8 ps                 : 1;
 183         __u8 reserved1          : 1;
 184         __u8 page_code          : 6;
 185         __u8 page_length;
 186         __u8 reserved2          : 1;
 187         __u8 bufe               : 1;
 188         __u8 ls_v               : 1;
 189         __u8 test_write         : 1;
 190         __u8 write_type         : 4;
 191         __u8 multi_session      : 2; /* or border, DVD */
 192         __u8 fp                 : 1;
 193         __u8 copy               : 1;
 194         __u8 track_mode         : 4;
 195         __u8 reserved3          : 4;
 196         __u8 data_block_type    : 4;
 197 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 198         __u8 page_code          : 6;
 199         __u8 reserved1          : 1;
 200         __u8 ps                 : 1;
 201         __u8 page_length;
 202         __u8 write_type         : 4;
 203         __u8 test_write         : 1;
 204         __u8 ls_v               : 1;
 205         __u8 bufe               : 1;
 206         __u8 reserved2          : 1;
 207         __u8 track_mode         : 4;
 208         __u8 copy               : 1;
 209         __u8 fp                 : 1;
 210         __u8 multi_session      : 2; /* or border, DVD */
 211         __u8 data_block_type    : 4;
 212         __u8 reserved3          : 4;
 213 #endif
 214         __u8 link_size;
 215         __u8 reserved4;
 216 #if defined(__BIG_ENDIAN_BITFIELD)
 217         __u8 reserved5          : 2;
 218         __u8 app_code           : 6;
 219 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 220         __u8 app_code           : 6;
 221         __u8 reserved5          : 2;
 222 #endif
 223         __u8 session_format;
 224         __u8 reserved6;
 225         __be32 packet_size;
 226         __u16 audio_pause;
 227         __u8 mcn[16];
 228         __u8 isrc[16];
 229         __u8 subhdr0;
 230         __u8 subhdr1;
 231         __u8 subhdr2;
 232         __u8 subhdr3;
 233 } __attribute__((packed)) write_param_page;
 234
 235 struct modesel_head
 236 {
 237         __u8    reserved1;
 238         __u8    medium;
 239         __u8    reserved2;
 240         __u8    block_desc_length;
 241         __u8    density;
 242         __u8    number_of_blocks_hi;
 243         __u8    number_of_blocks_med;
 244         __u8    number_of_blocks_lo;
 245         __u8    reserved3;
 246         __u8    block_length_hi;
 247         __u8    block_length_med;
 248         __u8    block_length_lo;
 249 };
 250
 251 typedef struct {
 252         __u16 report_key_length;
 253         __u8 reserved1;
 254         __u8 reserved2;
 255 #if defined(__BIG_ENDIAN_BITFIELD)
 256         __u8 type_code                  : 2;
 257         __u8 vra                        : 3;
 258         __u8 ucca                       : 3;
 259 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 260         __u8 ucca                       : 3;
 261         __u8 vra                        : 3;
 262         __u8 type_code                  : 2;
 263 #endif
 264         __u8 region_mask;
 265         __u8 rpc_scheme;
 266         __u8 reserved3;
 267 } rpc_state_t;
 268
 269 struct event_header {
 270         __be16 data_len;
 271 #if defined(__BIG_ENDIAN_BITFIELD)
 272         __u8 nea                : 1;
 273         __u8 reserved1          : 4;
 274         __u8 notification_class : 3;
 275 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 276         __u8 notification_class : 3;
 277         __u8 reserved1          : 4;
 278         __u8 nea                : 1;
 279 #endif
 280         __u8 supp_event_class;
 281 };
 282
 283 struct media_event_desc {
 284 #if defined(__BIG_ENDIAN_BITFIELD)
 285         __u8 reserved1          : 4;
 286         __u8 media_event_code   : 4;
 287         __u8 reserved2          : 6;
 288         __u8 media_present      : 1;
 289         __u8 door_open          : 1;
 290 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 291         __u8 media_event_code   : 4;
 292         __u8 reserved1          : 4;
 293         __u8 door_open          : 1;
 294         __u8 media_present      : 1;
 295         __u8 reserved2          : 6;
 296 #endif
 297         __u8 start_slot;
 298         __u8 end_slot;
 299 };
 300
 301 extern int cdrom_get_media_event(struct cdrom_device_info *cdi, struct media_event_desc *med);
 302
 303 static inline void lba_to_msf(int lba, u8 *m, u8 *s, u8 *f)
 304 {
 305         lba += CD_MSF_OFFSET;
 306         lba &= 0xffffff;  /* negative lbas use only 24 bits */
 307         *m = lba / (CD_SECS * CD_FRAMES);
 308         lba %= (CD_SECS * CD_FRAMES);
 309         *s = lba / CD_FRAMES;
 310         *f = lba % CD_FRAMES;
 311 }
 312
 313 static inline int msf_to_lba(u8 m, u8 s, u8 f)
 314 {
 315         return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
 316 }
 317 #endif  /* _LINUX_CDROM_H */