include/linux/cdrom.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
lba_to_msf
msf_to_lba
/*
 * -- <linux/cdrom.h>
 * General header file for linux CD-ROM drivers 
 * Copyright (C) 1992         David Giller, rafetmad@oxy.edu
 *               1994, 1995   Eberhard Mönkeberg, emoenke@gwdg.de
 *               1996         David van Leeuwen, david@tm.tno.nl
 *               1997, 1998   Erik Andersen, andersee@debian.org
 *               1998-2002    Jens Axboe, axboe@suse.de
 */
#ifndef _LINUX_CDROM_H
#define _LINUX_CDROM_H

#include <linux/fs.h>           /* not really needed, later.. */
#include <linux/list.h>
#include <uapi/linux/cdrom.h>

struct packet_command
{
        unsigned char           cmd[CDROM_PACKET_SIZE];
        unsigned char           *buffer;
        unsigned int            buflen;
        int                     stat;
        struct request_sense    *sense;
        unsigned char           data_direction;
        int                     quiet;
        int                     timeout;
        void                    *reserved[1];
};

/*
 * _OLD will use PIO transfer on atapi devices, _BPC_* will use DMA
 */
#define CDDA_OLD                0       /* old style */
#define CDDA_BPC_SINGLE         1       /* single frame block pc */
#define CDDA_BPC_FULL           2       /* multi frame block pc */

/* Uniform cdrom data structures for cdrom.c */
struct cdrom_device_info {
        struct cdrom_device_ops  *ops;  /* link to device_ops */
        struct list_head list;          /* linked list of all device_info */
        struct gendisk *disk;           /* matching block layer disk */
        void *handle;                   /* driver-dependent data */
/* specifications */
        int mask;                       /* mask of capability: disables them */
        int speed;                      /* maximum speed for reading data */
        int capacity;                   /* number of discs in jukebox */
/* device-related storage */
        unsigned int options    : 30;   /* options flags */
        unsigned mc_flags       : 2;    /* media change buffer flags */
        unsigned int vfs_events;        /* cached events for vfs path */
        unsigned int ioctl_events;      /* cached events for ioctl path */
        int use_count;                  /* number of times device opened */
        char name[20];                  /* name of the device type */
/* per-device flags */
        __u8 sanyo_slot         : 2;    /* Sanyo 3 CD changer support */
        __u8 keeplocked         : 1;    /* CDROM_LOCKDOOR status */
        __u8 reserved           : 5;    /* not used yet */
        int cdda_method;                /* see flags */
        __u8 last_sense;
        __u8 media_written;             /* dirty flag, DVD+RW bookkeeping */
        unsigned short mmc3_profile;    /* current MMC3 profile */
        int for_data;
        int (*exit)(struct cdrom_device_info *);
        int mrw_mode_page;
};

struct cdrom_device_ops {
/* routines */
        int (*open) (struct cdrom_device_info *, int);
        void (*release) (struct cdrom_device_info *);
        int (*drive_status) (struct cdrom_device_info *, int);
        unsigned int (*check_events) (struct cdrom_device_info *cdi,
                                      unsigned int clearing, int slot);
        int (*media_changed) (struct cdrom_device_info *, int);
        int (*tray_move) (struct cdrom_device_info *, int);
        int (*lock_door) (struct cdrom_device_info *, int);
        int (*select_speed) (struct cdrom_device_info *, int);
        int (*select_disc) (struct cdrom_device_info *, int);
        int (*get_last_session) (struct cdrom_device_info *,
                                 struct cdrom_multisession *);
        int (*get_mcn) (struct cdrom_device_info *,
                        struct cdrom_mcn *);
        /* hard reset device */
        int (*reset) (struct cdrom_device_info *);
        /* play stuff */
        int (*audio_ioctl) (struct cdrom_device_info *,unsigned int, void *);

/* driver specifications */
        const int capability;   /* capability flags */
        int n_minors;           /* number of active minor devices */
        /* handle uniform packets for scsi type devices (scsi,atapi) */
        int (*generic_packet) (struct cdrom_device_info *,
                               struct packet_command *);
};

/* the general block_device operations structure: */
extern int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
                        fmode_t mode);
extern void cdrom_release(struct cdrom_device_info *cdi, fmode_t mode);
extern int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
                       fmode_t mode, unsigned int cmd, unsigned long arg);
extern unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
                                       unsigned int clearing);
extern int cdrom_media_changed(struct cdrom_device_info *);

extern int register_cdrom(struct cdrom_device_info *cdi);
extern void unregister_cdrom(struct cdrom_device_info *cdi);

typedef struct {
    int data;
    int audio;
    int cdi;
    int xa;
    long error;
} tracktype;

extern int cdrom_get_last_written(struct cdrom_device_info *cdi, long *last_written);
extern int cdrom_number_of_slots(struct cdrom_device_info *cdi);
extern int cdrom_mode_select(struct cdrom_device_info *cdi,
                             struct packet_command *cgc);
extern int cdrom_mode_sense(struct cdrom_device_info *cdi,
                            struct packet_command *cgc,
                            int page_code, int page_control);
extern void init_cdrom_command(struct packet_command *cgc,
                               void *buffer, int len, int type);

/* The SCSI spec says there could be 256 slots. */
#define CDROM_MAX_SLOTS 256

struct cdrom_mechstat_header {
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 fault         : 1;
        __u8 changer_state : 2;
        __u8 curslot       : 5;
        __u8 mech_state    : 3;
        __u8 door_open     : 1;
        __u8 reserved1     : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 curslot       : 5;
        __u8 changer_state : 2;
        __u8 fault         : 1;
        __u8 reserved1     : 4;
        __u8 door_open     : 1;
        __u8 mech_state    : 3;
#endif
        __u8     curlba[3];
        __u8     nslots;
        __u16 slot_tablelen;
};

struct cdrom_slot {
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 disc_present : 1;
        __u8 reserved1    : 6;
        __u8 change       : 1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 change       : 1;
        __u8 reserved1    : 6;
        __u8 disc_present : 1;
#endif
        __u8 reserved2[3];
};

struct cdrom_changer_info {
        struct cdrom_mechstat_header hdr;
        struct cdrom_slot slots[CDROM_MAX_SLOTS];
};

typedef enum {
        mechtype_caddy = 0,
        mechtype_tray  = 1,
        mechtype_popup = 2,
        mechtype_individual_changer = 4,
        mechtype_cartridge_changer  = 5
} mechtype_t;

typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 ps                 : 1;
        __u8 reserved1          : 1;
        __u8 page_code          : 6;
        __u8 page_length;
        __u8 reserved2          : 1;
        __u8 bufe               : 1;
        __u8 ls_v               : 1;
        __u8 test_write         : 1;
        __u8 write_type         : 4;
        __u8 multi_session      : 2; /* or border, DVD */
        __u8 fp                 : 1;
        __u8 copy               : 1;
        __u8 track_mode         : 4;
        __u8 reserved3          : 4;
        __u8 data_block_type    : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 page_code          : 6;
        __u8 reserved1          : 1;
        __u8 ps                 : 1;
        __u8 page_length;
        __u8 write_type         : 4;
        __u8 test_write         : 1;
        __u8 ls_v               : 1;
        __u8 bufe               : 1;
        __u8 reserved2          : 1;
        __u8 track_mode         : 4;
        __u8 copy               : 1;
        __u8 fp                 : 1;
        __u8 multi_session      : 2; /* or border, DVD */
        __u8 data_block_type    : 4;
        __u8 reserved3          : 4;
#endif
        __u8 link_size;
        __u8 reserved4;
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 reserved5          : 2;
        __u8 app_code           : 6;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 app_code           : 6;
        __u8 reserved5          : 2;
#endif
        __u8 session_format;
        __u8 reserved6;
        __be32 packet_size;
        __u16 audio_pause;
        __u8 mcn[16];
        __u8 isrc[16];
        __u8 subhdr0;
        __u8 subhdr1;
        __u8 subhdr2;
        __u8 subhdr3;
} __attribute__((packed)) write_param_page;

struct modesel_head
{
        __u8    reserved1;
        __u8    medium;
        __u8    reserved2;
        __u8    block_desc_length;
        __u8    density;
        __u8    number_of_blocks_hi;
        __u8    number_of_blocks_med;
        __u8    number_of_blocks_lo;
        __u8    reserved3;
        __u8    block_length_hi;
        __u8    block_length_med;
        __u8    block_length_lo;
};

typedef struct {
        __u16 report_key_length;
        __u8 reserved1;
        __u8 reserved2;
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 type_code                  : 2;
        __u8 vra                        : 3;
        __u8 ucca                       : 3;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 ucca                       : 3;
        __u8 vra                        : 3;
        __u8 type_code                  : 2;
#endif
        __u8 region_mask;
        __u8 rpc_scheme;
        __u8 reserved3;
} rpc_state_t;

struct event_header {
        __be16 data_len;
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 nea                : 1;
        __u8 reserved1          : 4;
        __u8 notification_class : 3;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 notification_class : 3;
        __u8 reserved1          : 4;
        __u8 nea                : 1;
#endif
        __u8 supp_event_class;
};

struct media_event_desc {
#if defined(__BIG_ENDIAN_BITFIELD)
        __u8 reserved1          : 4;
        __u8 media_event_code   : 4;
        __u8 reserved2          : 6;
        __u8 media_present      : 1;
        __u8 door_open          : 1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 media_event_code   : 4;
        __u8 reserved1          : 4;
        __u8 door_open          : 1;
        __u8 media_present      : 1;
        __u8 reserved2          : 6;
#endif
        __u8 start_slot;
        __u8 end_slot;
};

extern int cdrom_get_media_event(struct cdrom_device_info *cdi, struct media_event_desc *med);

static inline void lba_to_msf(int lba, u8 *m, u8 *s, u8 *f)
{
        lba += CD_MSF_OFFSET;
        lba &= 0xffffff;  /* negative lbas use only 24 bits */
        *m = lba / (CD_SECS * CD_FRAMES);
        lba %= (CD_SECS * CD_FRAMES);
        *s = lba / CD_FRAMES;
        *f = lba % CD_FRAMES;
}

static inline int msf_to_lba(u8 m, u8 s, u8 f)
{
        return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
}
#endif  /* _LINUX_CDROM_H */
/* [<][>][^][v][top][bottom][index][help] */
root/include/linux/cdrom.h

INCLUDED FROM

DEFINITIONS
