/* SPDX-License-Identifier: GPL-2.0 */ /* * usr/include/linux/lp.h c.1991-1992 James Wiegand * many modifications copyright (C) 1992 Michael K. Johnson * Interrupt support added 1993 Nigel Gamble * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti */ #ifndef _LINUX_LP_H #define _LINUX_LP_H #include <linux/wait.h> #include <linux/mutex.h> #include <uapi/linux/lp.h> /* Magic numbers for defining port-device mappings */ #define LP_PARPORT_UNSPEC -4 #define LP_PARPORT_AUTO -3 #define LP_PARPORT_OFF -2 #define LP_PARPORT_NONE -1 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ #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)].dev->port->irq /* interrupt # */ /* PARPORT_IRQ_NONE means polled */ #ifdef LP_STATS #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ #endif #define LP_BUFFER_SIZE PAGE_SIZE #define LP_BASE(x) lp_table[(x)].dev->port->base #ifdef LP_STATS struct lp_stats { unsigned long chars; unsigned long sleeps; unsigned int maxrun; unsigned int maxwait; unsigned int meanwait; unsigned int mdev; }; #endif struct lp_struct { struct pardevice *dev; unsigned long flags; unsigned int chars; unsigned int time; unsigned int wait; char *lp_buffer; #ifdef LP_STATS unsigned int lastcall; unsigned int runchars; struct lp_stats stats; #endif wait_queue_head_t waitq; unsigned int last_error; struct mutex port_mutex; wait_queue_head_t dataq; long timeout; unsigned int best_mode; unsigned int current_mode; unsigned long bits; }; /* * The following constants describe the various signals of the printer port * hardware. Note that the hardware inverts some signals and that some * signals are active low. An example is LP_STROBE, which must be programmed * with 1 for being active and 0 for being inactive, because the strobe signal * gets inverted, but it is also active low. */ /* * defines for 8255 control port * base + 2 * accessed with LP_C(minor) */ #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ #define LP_PSELECP 0x08 /* inverted output, active low */ #define LP_PINITP 0x04 /* unchanged output, active low */ #define LP_PAUTOLF 0x02 /* inverted output, active low */ #define LP_PSTROBE 0x01 /* short high output on raising edge */ /* * 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, in microseconds. * It is used only in the lp_init() and lp_reset() routine. */ #define LP_DELAY 50 #endifOverall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 224 | 90.32% | 17 | 77.27% |
| Linus Torvalds | 12 | 4.84% | 1 | 4.55% |
| Dave Jones | 5 | 2.02% | 1 | 4.55% |
| David Howells | 4 | 1.61% | 1 | 4.55% |
| Matthias Kaehlcke | 2 | 0.81% | 1 | 4.55% |
| Greg Kroah-Hartman | 1 | 0.40% | 1 | 4.55% |
| Total | 248 | 100.00% | 22 | 100.00% |