cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / linux / pg.h

diff --git a/i686-linux-gnu-4.7/usr/include/linux/pg.h b/i686-linux-gnu-4.7/usr/include/linux/pg.h
new file mode 100644 (file)
index 0000000..364c350
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/linux/pg.h
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+/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
+/*     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 */