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101 lines
2.8 KiB
101 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* usr/include/linux/lp.h c.1991-1992 James Wiegand |
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* many modifications copyright (C) 1992 Michael K. Johnson |
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* Interrupt support added 1993 Nigel Gamble |
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* Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti |
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*/ |
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#ifndef _LINUX_LP_H |
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#define _LINUX_LP_H |
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#include <linux/wait.h> |
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#include <linux/mutex.h> |
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#include <uapi/linux/lp.h> |
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/* Magic numbers for defining port-device mappings */ |
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#define LP_PARPORT_UNSPEC -4 |
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#define LP_PARPORT_AUTO -3 |
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#define LP_PARPORT_OFF -2 |
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#define LP_PARPORT_NONE -1 |
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#define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ |
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#define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ |
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#define LP_TIME(minor) lp_table[(minor)].time /* wait time */ |
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#define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ |
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#define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ |
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/* PARPORT_IRQ_NONE means polled */ |
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#ifdef LP_STATS |
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#define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ |
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#endif |
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#define LP_BUFFER_SIZE PAGE_SIZE |
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#define LP_BASE(x) lp_table[(x)].dev->port->base |
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#ifdef LP_STATS |
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struct lp_stats { |
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unsigned long chars; |
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unsigned long sleeps; |
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unsigned int maxrun; |
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unsigned int maxwait; |
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unsigned int meanwait; |
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unsigned int mdev; |
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}; |
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#endif |
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struct lp_struct { |
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struct pardevice *dev; |
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unsigned long flags; |
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unsigned int chars; |
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unsigned int time; |
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unsigned int wait; |
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char *lp_buffer; |
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#ifdef LP_STATS |
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unsigned int lastcall; |
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unsigned int runchars; |
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struct lp_stats stats; |
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#endif |
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wait_queue_head_t waitq; |
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unsigned int last_error; |
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struct mutex port_mutex; |
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wait_queue_head_t dataq; |
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long timeout; |
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unsigned int best_mode; |
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unsigned int current_mode; |
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unsigned long bits; |
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}; |
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/* |
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* The following constants describe the various signals of the printer port |
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* hardware. Note that the hardware inverts some signals and that some |
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* signals are active low. An example is LP_STROBE, which must be programmed |
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* with 1 for being active and 0 for being inactive, because the strobe signal |
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* gets inverted, but it is also active low. |
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*/ |
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/* |
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* defines for 8255 control port |
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* base + 2 |
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* accessed with LP_C(minor) |
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*/ |
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#define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ |
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#define LP_PSELECP 0x08 /* inverted output, active low */ |
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#define LP_PINITP 0x04 /* unchanged output, active low */ |
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#define LP_PAUTOLF 0x02 /* inverted output, active low */ |
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#define LP_PSTROBE 0x01 /* short high output on raising edge */ |
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/* |
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* the value written to ports to test existence. PC-style ports will |
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* return the value written. AT-style ports will return 0. so why not |
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* make them the same ? |
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*/ |
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#define LP_DUMMY 0x00 |
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/* |
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* This is the port delay time, in microseconds. |
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* It is used only in the lp_init() and lp_reset() routine. |
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*/ |
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#define LP_DELAY 50 |
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#endif
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