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