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