diff options
Diffstat (limited to 'include/linux/lp.h')
| -rw-r--r-- | include/linux/lp.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/include/linux/lp.h b/include/linux/lp.h new file mode 100644 index 000000000..0dd276af9 --- /dev/null +++ b/include/linux/lp.h @@ -0,0 +1,100 @@ +/* + * 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 + +#endif |