1 #pragma once 2 3 /* 4 * usr/include/linux/lp.h c.1991-1992 James Wiegand 5 * many modifications copyright (C) 1992 Michael K. Johnson 6 * Interrupt support added 1993 Nigel Gamble 7 */ 8 9 /* 10 * Per POSIX guidelines, this module reserves the LP and lp prefixes 11 * These are the lp_table[minor].flags flags... 12 */ 13 #define LP_EXIST 0x0001 14 #define LP_SELEC 0x0002 15 #define LP_BUSY 0x0004 16 #define LP_OFFL 0x0008 17 #define LP_NOPA 0x0010 18 #define LP_ERR 0x0020 19 #define LP_ABORT 0x0040 20 #define LP_CAREFUL 0x0080 21 #define LP_ABORTOPEN 0x0100 22 23 /* timeout for each character. This is relative to bus cycles -- it 24 * is the count in a busy loop. THIS IS THE VALUE TO CHANGE if you 25 * have extremely slow printing, or if the machine seems to slow down 26 * a lot when you print. If you have slow printing, increase this 27 * number and recompile, and if your system gets bogged down, decrease 28 * this number. This can be changed with the tunelp(8) command as well. 29 */ 30 31 #define LP_INIT_CHAR 1000 32 33 /* The parallel port specs apparently say that there needs to be 34 * a .5usec wait before and after the strobe. Since there are wildly 35 * different computers running linux, I can't come up with a perfect 36 * value, but since it worked well on most printers before without, 37 * I'll initialize it to 0. 38 */ 39 40 #define LP_INIT_WAIT 0 41 42 /* This is the amount of time that the driver waits for the printer to 43 * catch up when the printer's buffer appears to be filled. If you 44 * want to tune this and have a fast printer (i.e. HPIIIP), decrease 45 * this number, and if you have a slow printer, increase this number. 46 * This is in hundredths of a second, the default 2 being .05 second. 47 * Or use the tunelp(8) command, which is especially nice if you want 48 * change back and forth between character and graphics printing, which 49 * are wildly different... 50 */ 51 52 #define LP_INIT_TIME 2 53 54 /* IOCTL numbers */ 55 #define LPCHAR 0x0601 /* corresponds to LP_INIT_CHAR */ 56 #define LPTIME 0x0602 /* corresponds to LP_INIT_TIME */ 57 #define LPABORT 0x0604 /* call with TRUE arg to abort on error, 58 FALSE to retry. Default is retry. */ 59 #define LPSETIRQ 0x0605 /* call with new IRQ number, 60 or 0 for polling (no IRQ) */ 61 #define LPGETIRQ 0x0606 /* get the current IRQ number */ 62 #define LPWAIT 0x0608 /* corresponds to LP_INIT_WAIT */ 63 #define LPCAREFUL 0x0609 /* call with TRUE arg to require out-of-paper, off- 64 line, and error indicators good on all writes, 65 FALSE to ignore them. Default is ignore. */ 66 #define LPABORTOPEN 0x060a /* call with TRUE arg to abort open() on error, 67 FALSE to ignore error. Default is ignore. */ 68 #define LPGETSTATUS 0x060b /* return LP_S(minor) */ 69 #define LPRESET 0x060c /* reset printer */ 70 71 /* timeout for printing a timeout, in jiffies (100ths of a second). 72 This is also used for re-checking error conditions if LP_ABORT is 73 not set. This is the default behavior. */ 74 75 #define LP_TIMEOUT_INTERRUPT (60 * HZ) 76 #define LP_TIMEOUT_POLLED (10 * HZ) 77 78 #if 0 79 #define LP_B(minor) lp_table[(minor)].base /* IO address */ 80 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ 81 #define LP_S(minor) inb_p(LP_B((minor)) + 1) /* status port */ 82 #define LP_C(minor) (lp_table[(minor)].base + 2) /* control port */ 83 #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ 84 #define LP_TIME(minor) lp_table[(minor)].time /* wait time */ 85 #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ 86 #define LP_IRQ(minor) lp_table[(minor)].irq /* interrupt # */ 87 /* 0 means polled */ 88 #endif 89 90 #define LP_BUFFER_SIZE 256 91 92 93 /* 94 * The following constants describe the various signals of the printer port 95 * hardware. Note that the hardware inverts some signals and that some 96 * signals are active low. An example is LP_STROBE, which must be programmed 97 * with 1 for being active and 0 for being inactive, because the strobe signal 98 * gets inverted, but it is also active low. 99 */ 100 101 /* 102 * bit defines for 8255 status port 103 * base + 1 104 * accessed with LP_S(minor), which gets the byte... 105 */ 106 #define LP_PBUSY 0x80 /* inverted input, active high */ 107 #define LP_PACK 0x40 /* unchanged input, active low */ 108 #define LP_POUTPA 0x20 /* unchanged input, active high */ 109 #define LP_PSELECD 0x10 /* unchanged input, active high */ 110 #define LP_PERRORP 0x08 /* unchanged input, active low */ 111 112 /* 113 * defines for 8255 control port 114 * base + 2 115 * accessed with LP_C(minor) 116 */ 117 #define LP_PINTEN 0x10 118 #define LP_PSELECP 0x08 /* inverted output, active low */ 119 #define LP_PINITP 0x04 /* unchanged output, active low */ 120 #define LP_PAUTOLF 0x02 /* inverted output, active low */ 121 #define LP_PSTROBE 0x01 /* inverted output, active low */ 122 123 /* 124 * the value written to ports to test existence. PC-style ports will 125 * return the value written. AT-style ports will return 0. so why not 126 * make them the same ? 127 */ 128 #define LP_DUMMY 0x00 129 130 /* 131 * This is the port delay time. Your mileage may vary. 132 * It is used only in the lp_init() routine. 133 */ 134 #define LP_DELAY 150000 135