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sr.h
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1 /*
2  * sr.h by David Giller
3  * CD-ROM disk driver header file
4  *
5  * adapted from:
6  * sd.h Copyright (C) 1992 Drew Eckhardt
7  * SCSI disk driver header file by
8  * Drew Eckhardt
9  *
10  * <[email protected]>
11  *
12  * Modified by Eric Youngdale [email protected] to
13  * add scatter-gather, multiple outstanding request, and other
14  * enhancements.
15  */
16 
17 #ifndef _SR_H
18 #define _SR_H
19 
20 #include <linux/genhd.h>
21 #include <linux/kref.h>
22 
23 #define MAX_RETRIES 3
24 #define SR_TIMEOUT (30 * HZ)
25 
26 struct scsi_device;
27 
28 /* The CDROM is fairly slow, so we need a little extra time */
29 /* In fact, it is very slow if it has to spin up first */
30 #define IOCTL_TIMEOUT 30*HZ
31 
32 
33 typedef struct scsi_cd {
34  struct scsi_driver *driver;
35  unsigned capacity; /* size in blocks */
36  struct scsi_device *device;
37  unsigned int vendor; /* vendor code, see sr_vendor.c */
38  unsigned long ms_offset; /* for reading multisession-CD's */
39  unsigned use:1; /* is this device still supportable */
40  unsigned xa_flag:1; /* CD has XA sectors ? */
41  unsigned readcd_known:1; /* drive supports READ_CD (0xbe) */
42  unsigned readcd_cdda:1; /* reading audio data using READ_CD */
43  unsigned media_present:1; /* media is present */
44 
45  /* GET_EVENT spurious event handling, blk layer guarantees exclusion */
46  int tur_mismatch; /* nr of get_event TUR mismatches */
47  bool tur_changed:1; /* changed according to TUR */
48  bool get_event_changed:1; /* changed according to GET_EVENT */
49  bool ignore_get_event:1; /* GET_EVENT is unreliable, use TUR */
50 
51  struct cdrom_device_info cdi;
52  /* We hold gendisk and scsi_device references on probe and use
53  * the refs on this kref to decide when to release them */
54  struct kref kref;
55  struct gendisk *disk;
56 } Scsi_CD;
57 
58 int sr_do_ioctl(Scsi_CD *, struct packet_command *);
59 
60 int sr_lock_door(struct cdrom_device_info *, int);
61 int sr_tray_move(struct cdrom_device_info *, int);
62 int sr_drive_status(struct cdrom_device_info *, int);
63 int sr_disk_status(struct cdrom_device_info *);
64 int sr_get_last_session(struct cdrom_device_info *, struct cdrom_multisession *);
65 int sr_get_mcn(struct cdrom_device_info *, struct cdrom_mcn *);
66 int sr_reset(struct cdrom_device_info *);
67 int sr_select_speed(struct cdrom_device_info *cdi, int speed);
68 int sr_audio_ioctl(struct cdrom_device_info *, unsigned int, void *);
69 
70 int sr_is_xa(Scsi_CD *);
71 
72 /* sr_vendor.c */
73 void sr_vendor_init(Scsi_CD *);
74 int sr_cd_check(struct cdrom_device_info *);
75 int sr_set_blocklength(Scsi_CD *, int blocklength);
76 
77 #endif
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