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TOMOYO Linux Cross Reference
Linux/include/uapi/linux/pg.h

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  1 /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
  2 /*      pg.h (c) 1998  Grant R. Guenther <grant@torque.net>
  3                        Under the terms of the GNU General Public License
  4 
  5 
  6         pg.h defines the user interface to the generic ATAPI packet
  7         command driver for parallel port ATAPI devices (pg). The
  8         driver is loosely modelled after the generic SCSI driver, sg,
  9         although the actual interface is different.
 10 
 11         The pg driver provides a simple character device interface for
 12         sending ATAPI commands to a device.  With the exception of the
 13         ATAPI reset operation, all operations are performed by a pair
 14         of read and write operations to the appropriate /dev/pgN device.
 15         A write operation delivers a command and any outbound data in
 16         a single buffer.  Normally, the write will succeed unless the
 17         device is offline or malfunctioning, or there is already another
 18         command pending.  If the write succeeds, it should be followed
 19         immediately by a read operation, to obtain any returned data and
 20         status information.  A read will fail if there is no operation
 21         in progress.
 22 
 23         As a special case, the device can be reset with a write operation,
 24         and in this case, no following read is expected, or permitted.
 25 
 26         There are no ioctl() operations.  Any single operation
 27         may transfer at most PG_MAX_DATA bytes.  Note that the driver must
 28         copy the data through an internal buffer.  In keeping with all
 29         current ATAPI devices, command packets are assumed to be exactly
 30         12 bytes in length.
 31 
 32         To permit future changes to this interface, the headers in the
 33         read and write buffers contain a single character "magic" flag.
 34         Currently this flag must be the character "P".
 35 
 36 */
 37 
 38 #define PG_MAGIC        'P'
 39 #define PG_RESET        'Z'
 40 #define PG_COMMAND      'C'
 41 
 42 #define PG_MAX_DATA     32768
 43 
 44 struct pg_write_hdr {
 45 
 46         char    magic;          /* == PG_MAGIC */
 47         char    func;           /* PG_RESET or PG_COMMAND */
 48         int     dlen;           /* number of bytes expected to transfer */
 49         int     timeout;        /* number of seconds before timeout */
 50         char    packet[12];     /* packet command */
 51 
 52 };
 53 
 54 struct pg_read_hdr {
 55 
 56         char    magic;          /* == PG_MAGIC */
 57         char    scsi;           /* "scsi" status == sense key */
 58         int     dlen;           /* size of device transfer request */
 59         int     duration;       /* time in seconds command took */
 60         char    pad[12];        /* not used */
 61 
 62 };
 63 
 64 /* end of pg.h */
 65 

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