1 #ifndef _LINUX_LP_H 2 #define _LINUX_LP_H 3 4 /* 5 * usr/include/linux/lp.h c.1991-1992 James Wiegand 6 * many modifications copyright (C) 1992 Michael K. Johnson 7 * Interrupt support added 1993 Nigel Gamble 8 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 9 */ 10 11 /* 12 * Per POSIX guidelines, this module reserves the LP and lp prefixes 13 * These are the lp_table[minor].flags flags... 14 */ 15 #define LP_EXIST 0x0001 16 #define LP_SELEC 0x0002 17 #define LP_BUSY 0x0004 18 #define LP_BUSY_BIT_POS 2 19 #define LP_OFFL 0x0008 20 #define LP_NOPA 0x0010 21 #define LP_ERR 0x0020 22 #define LP_ABORT 0x0040 23 #define LP_CAREFUL 0x0080 /* obsoleted -arca */ 24 #define LP_ABORTOPEN 0x0100 25 26 #define LP_TRUST_IRQ_ 0x0200 /* obsolete */ 27 #define LP_NO_REVERSE 0x0400 /* No reverse mode available. */ 28 #define LP_DATA_AVAIL 0x0800 /* Data is available. */ 29 30 /* 31 * bit defines for 8255 status port 32 * base + 1 33 * accessed with LP_S(minor), which gets the byte... 34 */ 35 #define LP_PBUSY 0x80 /* inverted input, active high */ 36 #define LP_PACK 0x40 /* unchanged input, active low */ 37 #define LP_POUTPA 0x20 /* unchanged input, active high */ 38 #define LP_PSELECD 0x10 /* unchanged input, active high */ 39 #define LP_PERRORP 0x08 /* unchanged input, active low */ 40 41 /* timeout for each character. This is relative to bus cycles -- it 42 * is the count in a busy loop. THIS IS THE VALUE TO CHANGE if you 43 * have extremely slow printing, or if the machine seems to slow down 44 * a lot when you print. If you have slow printing, increase this 45 * number and recompile, and if your system gets bogged down, decrease 46 * this number. This can be changed with the tunelp(8) command as well. 47 */ 48 49 #define LP_INIT_CHAR 1000 50 51 /* The parallel port specs apparently say that there needs to be 52 * a .5usec wait before and after the strobe. 53 */ 54 55 #define LP_INIT_WAIT 1 56 57 /* This is the amount of time that the driver waits for the printer to 58 * catch up when the printer's buffer appears to be filled. If you 59 * want to tune this and have a fast printer (i.e. HPIIIP), decrease 60 * this number, and if you have a slow printer, increase this number. 61 * This is in hundredths of a second, the default 2 being .05 second. 62 * Or use the tunelp(8) command, which is especially nice if you want 63 * change back and forth between character and graphics printing, which 64 * are wildly different... 65 */ 66 67 #define LP_INIT_TIME 2 68 69 /* IOCTL numbers */ 70 #define LPCHAR 0x0601 /* corresponds to LP_INIT_CHAR */ 71 #define LPTIME 0x0602 /* corresponds to LP_INIT_TIME */ 72 #define LPABORT 0x0604 /* call with TRUE arg to abort on error, 73 FALSE to retry. Default is retry. */ 74 #define LPSETIRQ 0x0605 /* call with new IRQ number, 75 or 0 for polling (no IRQ) */ 76 #define LPGETIRQ 0x0606 /* get the current IRQ number */ 77 #define LPWAIT 0x0608 /* corresponds to LP_INIT_WAIT */ 78 /* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */ 79 #define LPCAREFUL 0x0609 /* call with TRUE arg to require out-of-paper, off- 80 line, and error indicators good on all writes, 81 FALSE to ignore them. Default is ignore. */ 82 #define LPABORTOPEN 0x060a /* call with TRUE arg to abort open() on error, 83 FALSE to ignore error. Default is ignore. */ 84 #define LPGETSTATUS 0x060b /* return LP_S(minor) */ 85 #define LPRESET 0x060c /* reset printer */ 86 #ifdef LP_STATS 87 #define LPGETSTATS 0x060d /* get statistics (struct lp_stats) */ 88 #endif 89 #define LPGETFLAGS 0x060e /* get status flags */ 90 #define LPSETTIMEOUT 0x060f /* set parport timeout */ 91 92 /* timeout for printk'ing a timeout, in jiffies (100ths of a second). 93 This is also used for re-checking error conditions if LP_ABORT is 94 not set. This is the default behavior. */ 95 96 #define LP_TIMEOUT_INTERRUPT (60 * HZ) 97 #define LP_TIMEOUT_POLLED (10 * HZ) 98 99 #ifdef __KERNEL__ 100 101 /* Magic numbers for defining port-device mappings */ 102 #define LP_PARPORT_UNSPEC -4 103 #define LP_PARPORT_AUTO -3 104 #define LP_PARPORT_OFF -2 105 #define LP_PARPORT_NONE -1 106 107 #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ 108 #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ 109 #define LP_TIME(minor) lp_table[(minor)].time /* wait time */ 110 #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ 111 #define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ 112 /* PARPORT_IRQ_NONE means polled */ 113 #ifdef LP_STATS 114 #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ 115 #endif 116 #define LP_BUFFER_SIZE PAGE_SIZE 117 118 #define LP_BASE(x) lp_table[(x)].dev->port->base 119 120 #ifdef LP_STATS 121 struct lp_stats { 122 unsigned long chars; 123 unsigned long sleeps; 124 unsigned int maxrun; 125 unsigned int maxwait; 126 unsigned int meanwait; 127 unsigned int mdev; 128 }; 129 #endif 130 131 struct lp_struct { 132 struct pardevice *dev; 133 unsigned long flags; 134 unsigned int chars; 135 unsigned int time; 136 unsigned int wait; 137 char *lp_buffer; 138 #ifdef LP_STATS 139 unsigned int lastcall; 140 unsigned int runchars; 141 struct lp_stats stats; 142 #endif 143 wait_queue_head_t waitq; 144 unsigned int last_error; 145 struct semaphore port_mutex; 146 wait_queue_head_t dataq; 147 long timeout; 148 unsigned int best_mode; 149 unsigned int current_mode; 150 unsigned long bits; 151 }; 152 153 /* 154 * The following constants describe the various signals of the printer port 155 * hardware. Note that the hardware inverts some signals and that some 156 * signals are active low. An example is LP_STROBE, which must be programmed 157 * with 1 for being active and 0 for being inactive, because the strobe signal 158 * gets inverted, but it is also active low. 159 */ 160 161 162 /* 163 * defines for 8255 control port 164 * base + 2 165 * accessed with LP_C(minor) 166 */ 167 #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ 168 #define LP_PSELECP 0x08 /* inverted output, active low */ 169 #define LP_PINITP 0x04 /* unchanged output, active low */ 170 #define LP_PAUTOLF 0x02 /* inverted output, active low */ 171 #define LP_PSTROBE 0x01 /* short high output on raising edge */ 172 173 /* 174 * the value written to ports to test existence. PC-style ports will 175 * return the value written. AT-style ports will return 0. so why not 176 * make them the same ? 177 */ 178 #define LP_DUMMY 0x00 179 180 /* 181 * This is the port delay time, in microseconds. 182 * It is used only in the lp_init() and lp_reset() routine. 183 */ 184 #define LP_DELAY 50 185 186 /* 187 * function prototypes 188 */ 189 190 extern int lp_init(void); 191 192 #endif 193 194 #endif 195