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/* 
	pg.c    (c) 1998  Grant R. Guenther <grant@torque.net>
			  Under the terms of the GNU General Public License.

	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".

	By default, the driver will autoprobe for a single parallel
	port ATAPI device, but if their individual parameters are
	specified, the driver can handle up to 4 devices.

	To use this device, you must have the following device 
	special files defined:

		/dev/pg0 c 97 0
		/dev/pg1 c 97 1
		/dev/pg2 c 97 2
		/dev/pg3 c 97 3

	(You'll need to change the 97 to something else if you use
	the 'major' parameter to install the driver on a different
	major number.)

	The behaviour of the pg driver can be altered by setting
	some parameters from the insmod command line.  The following
	parameters are adjustable:

	    drive0      These four arguments can be arrays of       
	    drive1      1-6 integers as follows:
	    drive2
	    drive3      <prt>,<pro>,<uni>,<mod>,<slv>,<dly>

			Where,

		<prt>   is the base of the parallel port address for
			the corresponding drive.  (required)

		<pro>   is the protocol number for the adapter that
			supports this drive.  These numbers are
			logged by 'paride' when the protocol modules
			are initialised.  (0 if not given)

		<uni>   for those adapters that support chained
			devices, this is the unit selector for the
			chain of devices on the given port.  It should
			be zero for devices that don't support chaining.
			(0 if not given)

		<mod>   this can be -1 to choose the best mode, or one
			of the mode numbers supported by the adapter.
			(-1 if not given)

		<slv>   ATAPI devices can be jumpered to master or slave.
			Set this to 0 to choose the master drive, 1 to
			choose the slave, -1 (the default) to choose the
			first drive found.

		<dly>   some parallel ports require the driver to 
			go more slowly.  -1 sets a default value that
			should work with the chosen protocol.  Otherwise,
			set this to a small integer, the larger it is
			the slower the port i/o.  In some cases, setting
			this to zero will speed up the device. (default -1)

	    major	You may use this parameter to overide the
			default major number (97) that this driver