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      1 /*
      2  * Copyright (C) 2000 Jens Axboe <axboe (at) suse.de>
      3  * Copyright (C) 2001-2004 Peter Osterlund <petero2 (at) telia.com>
      4  *
      5  * May be copied or modified under the terms of the GNU General Public
      6  * License.  See linux/COPYING for more information.
      7  *
      8  * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
      9  * DVD-RW devices.
     10  *
     11  */
     12 #ifndef __PKTCDVD_H
     13 #define __PKTCDVD_H
     14 
     15 #include <linux/types.h>
     16 
     17 /*
     18  * 1 for normal debug messages, 2 is very verbose. 0 to turn it off.
     19  */
     20 #define PACKET_DEBUG		1
     21 
     22 #define	MAX_WRITERS		8
     23 
     24 #define PKT_RB_POOL_SIZE	512
     25 
     26 /*
     27  * How long we should hold a non-full packet before starting data gathering.
     28  */
     29 #define PACKET_WAIT_TIME	(HZ * 5 / 1000)
     30 
     31 /*
     32  * use drive write caching -- we need deferred error handling to be
     33  * able to sucessfully recover with this option (drive will return good
     34  * status as soon as the cdb is validated).
     35  */
     36 #if defined(CONFIG_CDROM_PKTCDVD_WCACHE)
     37 #define USE_WCACHING		1
     38 #else
     39 #define USE_WCACHING		0
     40 #endif
     41 
     42 /*
     43  * No user-servicable parts beyond this point ->
     44  */
     45 
     46 /*
     47  * device types
     48  */
     49 #define PACKET_CDR		1
     50 #define	PACKET_CDRW		2
     51 #define PACKET_DVDR		3
     52 #define PACKET_DVDRW		4
     53 
     54 /*
     55  * flags
     56  */
     57 #define PACKET_WRITABLE		1	/* pd is writable */
     58 #define PACKET_NWA_VALID	2	/* next writable address valid */
     59 #define PACKET_LRA_VALID	3	/* last recorded address valid */
     60 #define PACKET_MERGE_SEGS	4	/* perform segment merging to keep */
     61 					/* underlying cdrom device happy */
     62 
     63 /*
     64  * Disc status -- from READ_DISC_INFO
     65  */
     66 #define PACKET_DISC_EMPTY	0
     67 #define PACKET_DISC_INCOMPLETE	1
     68 #define PACKET_DISC_COMPLETE	2
     69 #define PACKET_DISC_OTHER	3
     70 
     71 /*
     72  * write type, and corresponding data block type
     73  */
     74 #define PACKET_MODE1		1
     75 #define PACKET_MODE2		2
     76 #define PACKET_BLOCK_MODE1	8
     77 #define PACKET_BLOCK_MODE2	10
     78 
     79 /*
     80  * Last session/border status
     81  */
     82 #define PACKET_SESSION_EMPTY		0
     83 #define PACKET_SESSION_INCOMPLETE	1
     84 #define PACKET_SESSION_RESERVED		2
     85 #define PACKET_SESSION_COMPLETE		3
     86 
     87 #define PACKET_MCN			"4a656e734178626f65323030300000"
     88 
     89 #undef PACKET_USE_LS
     90 
     91 #define PKT_CTRL_CMD_SETUP	0
     92 #define PKT_CTRL_CMD_TEARDOWN	1
     93 #define PKT_CTRL_CMD_STATUS	2
     94 
     95 struct pkt_ctrl_command {
     96 	__u32 command;				/* in: Setup, teardown, status */
     97 	__u32 dev_index;			/* in/out: Device index */
     98 	__u32 dev;				/* in/out: Device nr for cdrw device */
     99 	__u32 pkt_dev;				/* in/out: Device nr for packet device */
    100 	__u32 num_devices;			/* out: Largest device index + 1 */
    101 	__u32 padding;				/* Not used */
    102 };
    103 
    104 /*
    105  * packet ioctls
    106  */
    107 #define PACKET_IOCTL_MAGIC	('X')
    108 #define PACKET_CTRL_CMD		_IOWR(PACKET_IOCTL_MAGIC, 1, struct pkt_ctrl_command)
    109 
    110 
    111 #endif /* __PKTCDVD_H */
    112