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linux-stable/include/linux/cdrom.h
Christoph Hellwig a711d91cd9 block: add a cdrom_device_info pointer to struct gendisk 
Add a pointer to the CDROM information structure to struct gendisk.
This will allow various removable media file systems to call directly
into the CDROM layer instead of abusing ioctls with kernel pointers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-05-04 10:13:42 -06:00

317 lines
8.8 KiB
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* -- <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 <scsi/scsi_common.h>
#include <uapi/linux/cdrom.h>
struct packet_command
{
unsigned char cmd[CDROM_PACKET_SIZE];
unsigned char *buffer;
unsigned int buflen;
int stat;
struct scsi_sense_hdr *sshdr;
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 {
const 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 */
/* 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 gendisk *disk, 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);
extern int cdrom_dummy_generic_packet(struct cdrom_device_info *cdi,
struct packet_command *cgc);
/* 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 */
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