Import of Linus's Linux 1.1.68

1 files changed, 134 insertions, 0 deletions

diff --git a/include/linux/lp.h b/include/linux/lp.h
new file mode 100644
index 000000000..b8a1c03fc
--- /dev/null
+++ b/include/linux/lp.h
@@ -0,0 +1,134 @@
+#ifndef _LINUX_LP_H
+#define _LINUX_LP_H
+
+/*
+ * usr/include/linux/lp.h c.1991-1992 James Wiegand
+ * many modifications copyright (C) 1992 Michael K. Johnson
+ * Interrupt support added 1993 Nigel Gamble
+ */
+
+/*
+ * Per POSIX guidelines, this module reserves the LP and lp prefixes
+ * These are the lp_table[minor].flags flags...
+ */
+#define LP_EXIST 0x0001
+#define LP_SELEC 0x0002
+#define LP_BUSY	 0x0004
+#define LP_OFFL	 0x0008
+#define LP_NOPA  0x0010
+#define LP_ERR   0x0020
+#define LP_ABORT 0x0040
+
+/* timeout for each character.  This is relative to bus cycles -- it
+ * is the count in a busy loop.  THIS IS THE VALUE TO CHANGE if you
+ * have extremely slow printing, or if the machine seems to slow down
+ * a lot when you print.  If you have slow printing, increase this
+ * number and recompile, and if your system gets bogged down, decrease
+ * this number.  This can be changed with the tunelp(8) command as well.
+ */
+
+#define LP_INIT_CHAR 1000
+
+/* The parallel port specs apparently say that there needs to be
+ * a .5usec wait before and after the strobe.  Since there are wildly
+ * different computers running linux, I can't come up with a perfect
+ * value, but since it worked well on most printers before without,
+ * I'll initialize it to 0.
+ */
+
+#define LP_INIT_WAIT 0
+
+/* This is the amount of time that the driver waits for the printer to
+ * catch up when the printer's buffer appears to be filled.  If you
+ * want to tune this and have a fast printer (i.e. HPIIIP), decrease
+ * this number, and if you have a slow printer, increase this number.
+ * This is in hundredths of a second, the default 2 being .05 second.
+ * Or use the tunelp(8) command, which is especially nice if you want
+ * change back and forth between character and graphics printing, which
+ * are wildly different...
+ */
+
+#define LP_INIT_TIME 2
+
+/* IOCTL numbers */
+#define LPCHAR   0x0001  /* corresponds to LP_INIT_CHAR */
+#define LPTIME   0x0002  /* corresponds to LP_INIT_TIME */
+#define LPABORT  0x0004  /* call with TRUE arg to abort on error,
+			    FALSE to retry.  Default is retry.  */
+#define LPSETIRQ 0x0005  /* call with new IRQ number,
+			    or 0 for polling (no IRQ) */
+#define LPGETIRQ 0x0006  /* get the current IRQ number */
+#define LPWAIT   0x0008  /* corresponds to LP_INIT_WAIT */
+
+/* timeout for printk'ing a timeout, in jiffies (100ths of a second).
+   This is also used for re-checking error conditions if LP_ABORT is
+   not set.  This is the default behavior. */
+
+#define LP_TIMEOUT_INTERRUPT	(60 * HZ)
+#define LP_TIMEOUT_POLLED	(10 * HZ)
+
+#define LP_B(minor)	lp_table[(minor)].base		/* IO address */
+#define LP_F(minor)	lp_table[(minor)].flags		/* flags for busy, etc. */
+#define LP_S(minor)	inb_p(LP_B((minor)) + 1)	/* status port */
+#define LP_C(minor)	(lp_table[(minor)].base + 2)	/* control port */
+#define LP_CHAR(minor)	lp_table[(minor)].chars		/* busy timeout */
+#define LP_TIME(minor)	lp_table[(minor)].time		/* wait time */
+#define LP_WAIT(minor)	lp_table[(minor)].wait		/* strobe wait */
+#define LP_IRQ(minor)	lp_table[(minor)].irq		/* interrupt # */
+							/* 0 means polled */
+
+#define LP_BUFFER_SIZE 256
+
+struct lp_struct {
+	int base;
+	unsigned int irq;
+	int flags;
+	unsigned int chars;
+	unsigned int time;
+	unsigned int wait;
+	struct wait_queue *lp_wait_q;
+	char *lp_buffer;
+};
+
+/* 
+ * bit defines for 8255 status port
+ * base + 1
+ * accessed with LP_S(minor), which gets the byte...
+ */
+#define LP_PBUSY	0x80 /* active low */
+#define LP_PACK		0x40 /* active low */
+#define LP_POUTPA	0x20
+#define LP_PSELECD	0x10
+#define LP_PERRORP	0x08 /* active low*/
+
+/* 
+ * defines for 8255 control port
+ * base + 2 
+ * accessed with LP_C(minor)
+ */
+#define LP_PINTEN	0x10
+#define LP_PSELECP	0x08
+#define LP_PINITP	0x04  /* active low */
+#define LP_PAUTOLF	0x02
+#define LP_PSTROBE	0x01
+
+/* 
+ * the value written to ports to test existence. PC-style ports will 
+ * return the value written. AT-style ports will return 0. so why not
+ * make them the same ? 
+ */
+#define LP_DUMMY	0x00
+
+/*
+ * This is the port delay time.  Your mileage may vary.
+ * It is used only in the lp_init() routine.
+ */
+#define LP_DELAY 	150000
+
+/*
+ * function prototypes
+ */
+
+extern long lp_init(long);
+
+#endif