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Diffstat (limited to 'include/linux/lp.h')
| -rw-r--r-- | include/linux/lp.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/include/linux/lp.h b/include/linux/lp.h new file mode 100644 index 00000000000..7059b6b9878 --- /dev/null +++ b/include/linux/lp.h @@ -0,0 +1,191 @@ +#ifndef _LINUX_LP_H +#define _LINUX_LP_H + +/* + * 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 + */ + +/* + * Per POSIX guidelines, this module reserves the LP and lp prefixes + * These are the lp_table[minor].flags flags... + */ +#define LP_EXIST 0x0001 +#define LP_SELEC 0x0002 +#define LP_BUSY 0x0004 +#define LP_BUSY_BIT_POS 2 +#define LP_OFFL 0x0008 +#define LP_NOPA 0x0010 +#define LP_ERR 0x0020 +#define LP_ABORT 0x0040 +#define LP_CAREFUL 0x0080 /* obsoleted -arca */ +#define LP_ABORTOPEN 0x0100 + +#define LP_TRUST_IRQ_ 0x0200 /* obsolete */ +#define LP_NO_REVERSE 0x0400 /* No reverse mode available. */ +#define LP_DATA_AVAIL 0x0800 /* Data is available. */ + +/* + * bit defines for 8255 status port + * base + 1 + * accessed with LP_S(minor), which gets the byte... + */ +#define LP_PBUSY 0x80 /* inverted input, active high */ +#define LP_PACK 0x40 /* unchanged input, active low */ +#define LP_POUTPA 0x20 /* unchanged input, active high */ +#define LP_PSELECD 0x10 /* unchanged input, active high */ +#define LP_PERRORP 0x08 /* unchanged input, active low */ + +/* timeout for each character. This is relative to bus cycles -- it + * is the count in a busy loop. THIS IS THE VALUE TO CHANGE if you + * have extremely slow printing, or if the machine seems to slow down + * a lot when you print. If you have slow printing, increase this + * number and recompile, and if your system gets bogged down, decrease + * this number. This can be changed with the tunelp(8) command as well. + */ + +#define LP_INIT_CHAR 1000 + +/* The parallel port specs apparently say that there needs to be + * a .5usec wait before and after the strobe. + */ + +#define LP_INIT_WAIT 1 + +/* This is the amount of time that the driver waits for the printer to + * catch up when the printer's buffer appears to be filled. If you + * want to tune this and have a fast printer (i.e. HPIIIP), decrease + * this number, and if you have a slow printer, increase this number. + * This is in hundredths of a second, the default 2 being .05 second. + * Or use the tunelp(8) command, which is especially nice if you want + * change back and forth between character and graphics printing, which + * are wildly different... + */ + +#define LP_INIT_TIME 2 + +/* IOCTL numbers */ +#define LPCHAR 0x0601 /* corresponds to LP_INIT_CHAR */ +#define LPTIME 0x0602 /* corresponds to LP_INIT_TIME */ +#define LPABORT 0x0604 /* call with TRUE arg to abort on error, + FALSE to retry. Default is retry. */ +#define LPSETIRQ 0x0605 /* call with new IRQ number, + or 0 for polling (no IRQ) */ +#define LPGETIRQ 0x0606 /* get the current IRQ number */ +#define LPWAIT 0x0608 /* corresponds to LP_INIT_WAIT */ +/* NOTE: LPCAREFUL is obsoleted and it' s always the default right now -arca */ +#define LPCAREFUL 0x0609 /* call with TRUE arg to require out-of-paper, off- + line, and error indicators good on all writes, + FALSE to ignore them. Default is ignore. */ +#define LPABORTOPEN 0x060a /* call with TRUE arg to abort open() on error, + FALSE to ignore error. Default is ignore. */ +#define LPGETSTATUS 0x060b /* return LP_S(minor) */ +#define LPRESET 0x060c /* reset printer */ +#ifdef LP_STATS +#define LPGETSTATS 0x060d /* get statistics (struct lp_stats) */ +#endif +#define LPGETFLAGS 0x060e /* get status flags */ +#define LPSETTIMEOUT 0x060f /* set parport timeout */ + +/* timeout for printk'ing a timeout, in jiffies (100ths of a second). + This is also used for re-checking error conditions if LP_ABORT is + not set. This is the default behavior. */ + +#define LP_TIMEOUT_INTERRUPT (60 * HZ) +#define LP_TIMEOUT_POLLED (10 * HZ) + +#ifdef __KERNEL__ + +#include <linux/wait.h> +#include <asm/semaphore.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 semaphore 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 + +#endif + +#endif |