diff options
Diffstat (limited to 'include/linux/pg.h')
| -rw-r--r-- | include/linux/pg.h | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/include/linux/pg.h b/include/linux/pg.h deleted file mode 100644 index db994bb0c79..00000000000 --- a/include/linux/pg.h +++ /dev/null @@ -1,63 +0,0 @@ -/* pg.h (c) 1998 Grant R. Guenther <grant@torque.net> - Under the terms of the GNU General Public License - - - pg.h defines the user interface to the generic ATAPI packet - command driver for parallel port ATAPI devices (pg). The - driver is loosely modelled after the generic SCSI driver, sg, - although the actual interface is different. - - The pg driver provides a simple character device interface for - sending ATAPI commands to a device. With the exception of the - ATAPI reset operation, all operations are performed by a pair - of read and write operations to the appropriate /dev/pgN device. - A write operation delivers a command and any outbound data in - a single buffer. Normally, the write will succeed unless the - device is offline or malfunctioning, or there is already another - command pending. If the write succeeds, it should be followed - immediately by a read operation, to obtain any returned data and - status information. A read will fail if there is no operation - in progress. - - As a special case, the device can be reset with a write operation, - and in this case, no following read is expected, or permitted. - - There are no ioctl() operations. Any single operation - may transfer at most PG_MAX_DATA bytes. Note that the driver must - copy the data through an internal buffer. In keeping with all - current ATAPI devices, command packets are assumed to be exactly - 12 bytes in length. - - To permit future changes to this interface, the headers in the - read and write buffers contain a single character "magic" flag. - Currently this flag must be the character "P". - -*/ - -#define PG_MAGIC 'P' -#define PG_RESET 'Z' -#define PG_COMMAND 'C' - -#define PG_MAX_DATA 32768 - -struct pg_write_hdr { - - char magic; /* == PG_MAGIC */ - char func; /* PG_RESET or PG_COMMAND */ - int dlen; /* number of bytes expected to transfer */ - int timeout; /* number of seconds before timeout */ - char packet[12]; /* packet command */ - -}; - -struct pg_read_hdr { - - char magic; /* == PG_MAGIC */ - char scsi; /* "scsi" status == sense key */ - int dlen; /* size of device transfer request */ - int duration; /* time in seconds command took */ - char pad[12]; /* not used */ - -}; - -/* end of pg.h */ |