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- /* 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_ */
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