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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/lp.h
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
11 #include <linux/wait.h>
12 #include <linux/mutex.h>
13 #include <uapi/linux/lp.h>
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
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 */
28 #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */
30 #define LP_BUFFER_SIZE PAGE_SIZE
32 #define LP_BASE(x) lp_table[(x)].dev->port->base
40 unsigned int meanwait
;
46 struct pardevice
*dev
;
53 unsigned int lastcall
;
54 unsigned int runchars
;
55 struct lp_stats stats
;
57 wait_queue_head_t waitq
;
58 unsigned int last_error
;
59 struct mutex port_mutex
;
60 wait_queue_head_t dataq
;
62 unsigned int best_mode
;
63 unsigned int current_mode
;
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.
77 * defines for 8255 control port
79 * accessed with LP_C(minor)
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 */
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 ?
95 * This is the port delay time, in microseconds.
96 * It is used only in the lp_init() and lp_reset() routine.