LXR linux/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
  19struct 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 */
  40struct 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
  69struct 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
  97int cdrom_multisession(struct cdrom_device_info *cdi,
  98                struct cdrom_multisession *info);
  99int cdrom_read_tocentry(struct cdrom_device_info *cdi,
 100                struct cdrom_tocentry *entry);
 101
 102/* the general block_device operations structure: */
 103extern int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
 104                        fmode_t mode);
 105extern void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode);
 106extern int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
 107                       fmode_t mode, unsigned int cmd, unsigned long arg);
 108extern unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
 109                                       unsigned int clearing);
 110extern int cdrom_media_changed(struct cdrom_device_info *);
 111
 112extern int register_cdrom(struct gendisk *disk, struct cdrom_device_info *cdi);
 113extern void unregister_cdrom(struct cdrom_device_info *cdi);
 114
 115typedef struct {
 116    int data;
 117    int audio;
 118    int cdi;
 119    int xa;
 120    long error;
 121} tracktype;
 122
 123extern int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written);
 124extern int cdrom_number_of_slots(struct cdrom_device_info *cdi);
 125extern int cdrom_mode_select(struct cdrom_device_info *cdi,
 126                             struct packet_command *cgc);
 127extern int cdrom_mode_sense(struct cdrom_device_info *cdi,
 128                            struct packet_command *cgc,
 129                            int page_code, int page_control);
 130extern void init_cdrom_command(struct packet_command *cgc,
 131                               void *buffer, int len, int type);
 132extern int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
 133                                      struct packet_command *cgc);
 134
 135/* The SCSI spec says there could be 256 slots. */
 136#define CDROM_MAX_SLOTS 256
 137
 138struct cdrom_mechstat_header {
 139#if defined(__BIG_ENDIAN_BITFIELD)
 140        __u8 fault         : 1;
 141        __u8 changer_state : 2;
 142        __u8 curslot       : 5;
 143        __u8 mech_state    : 3;
 144        __u8 door_open     : 1;
 145        __u8 reserved1     : 4;
 146#elif defined(__LITTLE_ENDIAN_BITFIELD)
 147        __u8 curslot       : 5;
 148        __u8 changer_state : 2;
 149        __u8 fault         : 1;
 150        __u8 reserved1     : 4;
 151        __u8 door_open     : 1;
 152        __u8 mech_state    : 3;
 153#endif
 154        __u8     curlba[3];
 155        __u8     nslots;
 156        __u16 slot_tablelen;
 157};
 158
 159struct cdrom_slot {
 160#if defined(__BIG_ENDIAN_BITFIELD)
 161        __u8 disc_present : 1;
 162        __u8 reserved1    : 6;
 163        __u8 change       : 1;
 164#elif defined(__LITTLE_ENDIAN_BITFIELD)
 165        __u8 change       : 1;
 166        __u8 reserved1    : 6;
 167        __u8 disc_present : 1;
 168#endif
 169        __u8 reserved2[3];
 170};
 171
 172struct cdrom_changer_info {
 173        struct cdrom_mechstat_header hdr;
 174        struct cdrom_slot slots[CDROM_MAX_SLOTS];
 175};
 176
 177typedef enum {
 178        mechtype_caddy = 0,
 179        mechtype_tray  = 1,
 180        mechtype_popup = 2,
 181        mechtype_individual_changer = 4,
 182        mechtype_cartridge_changer  = 5
 183} mechtype_t;
 184
 185typedef struct {
 186#if defined(__BIG_ENDIAN_BITFIELD)
 187        __u8 ps                 : 1;
 188        __u8 reserved1          : 1;
 189        __u8 page_code          : 6;
 190        __u8 page_length;
 191        __u8 reserved2          : 1;
 192        __u8 bufe               : 1;
 193        __u8 ls_v               : 1;
 194        __u8 test_write         : 1;
 195        __u8 write_type         : 4;
 196        __u8 multi_session      : 2; /* or border, DVD */
 197        __u8 fp                 : 1;
 198        __u8 copy               : 1;
 199        __u8 track_mode         : 4;
 200        __u8 reserved3          : 4;
 201        __u8 data_block_type    : 4;
 202#elif defined(__LITTLE_ENDIAN_BITFIELD)
 203        __u8 page_code          : 6;
 204        __u8 reserved1          : 1;
 205        __u8 ps                 : 1;
 206        __u8 page_length;
 207        __u8 write_type         : 4;
 208        __u8 test_write         : 1;
 209        __u8 ls_v               : 1;
 210        __u8 bufe               : 1;
 211        __u8 reserved2          : 1;
 212        __u8 track_mode         : 4;
 213        __u8 copy               : 1;
 214        __u8 fp                 : 1;
 215        __u8 multi_session      : 2; /* or border, DVD */
 216        __u8 data_block_type    : 4;
 217        __u8 reserved3          : 4;
 218#endif
 219        __u8 link_size;
 220        __u8 reserved4;
 221#if defined(__BIG_ENDIAN_BITFIELD)
 222        __u8 reserved5          : 2;
 223        __u8 app_code           : 6;
 224#elif defined(__LITTLE_ENDIAN_BITFIELD)
 225        __u8 app_code           : 6;
 226        __u8 reserved5          : 2;
 227#endif
 228        __u8 session_format;
 229        __u8 reserved6;
 230        __be32 packet_size;
 231        __u16 audio_pause;
 232        __u8 mcn[16];
 233        __u8 isrc[16];
 234        __u8 subhdr0;
 235        __u8 subhdr1;
 236        __u8 subhdr2;
 237        __u8 subhdr3;
 238} __attribute__((packed)) write_param_page;
 239
 240struct modesel_head
 241{
 242        __u8    reserved1;
 243        __u8    medium;
 244        __u8    reserved2;
 245        __u8    block_desc_length;
 246        __u8    density;
 247        __u8    number_of_blocks_hi;
 248        __u8    number_of_blocks_med;
 249        __u8    number_of_blocks_lo;
 250        __u8    reserved3;
 251        __u8    block_length_hi;
 252        __u8    block_length_med;
 253        __u8    block_length_lo;
 254};
 255
 256typedef struct {
 257        __u16 report_key_length;
 258        __u8 reserved1;
 259        __u8 reserved2;
 260#if defined(__BIG_ENDIAN_BITFIELD)
 261        __u8 type_code                  : 2;
 262        __u8 vra                        : 3;
 263        __u8 ucca                       : 3;
 264#elif defined(__LITTLE_ENDIAN_BITFIELD)
 265        __u8 ucca                       : 3;
 266        __u8 vra                        : 3;
 267        __u8 type_code                  : 2;
 268#endif
 269        __u8 region_mask;
 270        __u8 rpc_scheme;
 271        __u8 reserved3;
 272} rpc_state_t;
 273
 274struct event_header {
 275        __be16 data_len;
 276#if defined(__BIG_ENDIAN_BITFIELD)
 277        __u8 nea                : 1;
 278        __u8 reserved1          : 4;
 279        __u8 notification_class : 3;
 280#elif defined(__LITTLE_ENDIAN_BITFIELD)
 281        __u8 notification_class : 3;
 282        __u8 reserved1          : 4;
 283        __u8 nea                : 1;
 284#endif
 285        __u8 supp_event_class;
 286};
 287
 288struct media_event_desc {
 289#if defined(__BIG_ENDIAN_BITFIELD)
 290        __u8 reserved1          : 4;
 291        __u8 media_event_code   : 4;
 292        __u8 reserved2          : 6;
 293        __u8 media_present      : 1;
 294        __u8 door_open          : 1;
 295#elif defined(__LITTLE_ENDIAN_BITFIELD)
 296        __u8 media_event_code   : 4;
 297        __u8 reserved1          : 4;
 298        __u8 door_open          : 1;
 299        __u8 media_present      : 1;
 300        __u8 reserved2          : 6;
 301#endif
 302        __u8 start_slot;
 303        __u8 end_slot;
 304};
 305
 306extern int cdrom_get_media_event(struct cdrom_device_info *cdi, struct media_event_desc *med);
 307
 308static inline void lba_to_msf(int lba, u8 *m, u8 *s, u8 *f)
 309{
 310        lba += CD_MSF_OFFSET;
 311        lba &= 0xffffff;  /* negative lbas use only 24 bits */
 312        *m = lba / (CD_SECS * CD_FRAMES);
 313        lba %= (CD_SECS * CD_FRAMES);
 314        *s = lba / CD_FRAMES;
 315        *f = lba % CD_FRAMES;
 316}
 317
 318static inline int msf_to_lba(u8 m, u8 s, u8 f)
 319{
 320        return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
 321}
 322#endif  /* _LINUX_CDROM_H */
 323