47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/* Copyright 2022 William Breathitt Gray */
|
||
|
|
#ifndef _I8255_H_
|
||
|
|
#define _I8255_H_
|
||
|
|
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct i8255 - Intel 8255 register structure
|
||
|
|
* @port: Port A, B, and C
|
||
|
|
* @control: Control register
|
||
|
|
*/
|
||
|
|
struct i8255 {
|
||
|
|
u8 port[3];
|
||
|
|
u8 control;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct i8255_state - Intel 8255 state structure
|
||
|
|
* @lock: synchronization lock for accessing device state
|
||
|
|
* @control_state: Control register state
|
||
|
|
*/
|
||
|
|
struct i8255_state {
|
||
|
|
spinlock_t lock;
|
||
|
|
u8 control_state;
|
||
|
|
};
|
||
|
|
|
||
|
|
void i8255_direction_input(struct i8255 __iomem *ppi, struct i8255_state *state,
|
||
|
|
unsigned long offset);
|
||
|
|
void i8255_direction_output(struct i8255 __iomem *ppi,
|
||
|
|
struct i8255_state *state, unsigned long offset,
|
||
|
|
unsigned long value);
|
||
|
|
int i8255_get(struct i8255 __iomem *ppi, unsigned long offset);
|
||
|
|
int i8255_get_direction(const struct i8255_state *state, unsigned long offset);
|
||
|
|
void i8255_get_multiple(struct i8255 __iomem *ppi, const unsigned long *mask,
|
||
|
|
unsigned long *bits, unsigned long ngpio);
|
||
|
|
void i8255_mode0_output(struct i8255 __iomem *const ppi);
|
||
|
|
void i8255_set(struct i8255 __iomem *ppi, struct i8255_state *state,
|
||
|
|
unsigned long offset, unsigned long value);
|
||
|
|
void i8255_set_multiple(struct i8255 __iomem *ppi, struct i8255_state *state,
|
||
|
|
const unsigned long *mask, const unsigned long *bits,
|
||
|
|
unsigned long ngpio);
|
||
|
|
void i8255_state_init(struct i8255_state *const state, unsigned long nbanks);
|
||
|
|
|
||
|
|
#endif /* _I8255_H_ */
|