1 /* 2 * usr/include/linux/lp.h c.1991-1992 James Wiegand 3 * many modifications copyright (C) 1992 Michael K. Johnson 4 * Interrupt support added 1993 Nigel Gamble 5 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 6 */ 7 #ifndef _LINUX_LP_H 8 #define _LINUX_LP_H 9 10 11 #include <linux/wait.h> 12 #include <linux/mutex.h> 13 #include <uapi/linux/lp.h> 14 15 /* Magic numbers for defining port-device mappings */ 16 #define LP_PARPORT_UNSPEC -4 17 #define LP_PARPORT_AUTO -3 18 #define LP_PARPORT_OFF -2 19 #define LP_PARPORT_NONE -1 20 21 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ 22 #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ 23 #define LP_TIME(minor) lp_table[(minor)].time /* wait time */ 24 #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ 25 #define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ 26 /* PARPORT_IRQ_NONE means polled */ 27 #ifdef LP_STATS 28 #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ 29 #endif 30 #define LP_BUFFER_SIZE PAGE_SIZE 31 32 #define LP_BASE(x) lp_table[(x)].dev->port->base 33 34 #ifdef LP_STATS 35 struct lp_stats { 36 unsigned long chars; 37 unsigned long sleeps; 38 unsigned int maxrun; 39 unsigned int maxwait; 40 unsigned int meanwait; 41 unsigned int mdev; 42 }; 43 #endif 44 45 struct lp_struct { 46 struct pardevice *dev; 47 unsigned long flags; 48 unsigned int chars; 49 unsigned int time; 50 unsigned int wait; 51 char *lp_buffer; 52 #ifdef LP_STATS 53 unsigned int lastcall; 54 unsigned int runchars; 55 struct lp_stats stats; 56 #endif 57 wait_queue_head_t waitq; 58 unsigned int last_error; 59 struct mutex port_mutex; 60 wait_queue_head_t dataq; 61 long timeout; 62 unsigned int best_mode; 63 unsigned int current_mode; 64 unsigned long bits; 65 }; 66 67 /* 68 * The following constants describe the various signals of the printer port 69 * hardware. Note that the hardware inverts some signals and that some 70 * signals are active low. An example is LP_STROBE, which must be programmed 71 * with 1 for being active and 0 for being inactive, because the strobe signal 72 * gets inverted, but it is also active low. 73 */ 74 75 76 /* 77 * defines for 8255 control port 78 * base + 2 79 * accessed with LP_C(minor) 80 */ 81 #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ 82 #define LP_PSELECP 0x08 /* inverted output, active low */ 83 #define LP_PINITP 0x04 /* unchanged output, active low */ 84 #define LP_PAUTOLF 0x02 /* inverted output, active low */ 85 #define LP_PSTROBE 0x01 /* short high output on raising edge */ 86 87 /* 88 * the value written to ports to test existence. PC-style ports will 89 * return the value written. AT-style ports will return 0. so why not 90 * make them the same ? 91 */ 92 #define LP_DUMMY 0x00 93 94 /* 95 * This is the port delay time, in microseconds. 96 * It is used only in the lp_init() and lp_reset() routine. 97 */ 98 #define LP_DELAY 50 99 100 #endif 101