72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright 2022 William Breathitt Gray */
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#ifndef _IDIO_16_H_
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#define _IDIO_16_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 idio_16 - IDIO-16 registers structure
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* @out0_7: Read: FET Drive Outputs 0-7
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* Write: FET Drive Outputs 0-7
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* @in0_7: Read: Isolated Inputs 0-7
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* Write: Clear Interrupt
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* @irq_ctl: Read: Enable IRQ
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* Write: Disable IRQ
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* @filter_ctl: Read: Activate Input Filters 0-15
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* Write: Deactivate Input Filters 0-15
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* @out8_15: Read: FET Drive Outputs 8-15
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* Write: FET Drive Outputs 8-15
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* @in8_15: Read: Isolated Inputs 8-15
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* Write: Unused
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* @irq_status: Read: Interrupt status
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* Write: Unused
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*/
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struct idio_16 {
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u8 out0_7;
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u8 in0_7;
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u8 irq_ctl;
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u8 filter_ctl;
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u8 out8_15;
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u8 in8_15;
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u8 irq_status;
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};
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#define IDIO_16_NOUT 16
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/**
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* struct idio_16_state - IDIO-16 state structure
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* @lock: synchronization lock for accessing device state
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* @out_state: output signals state
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*/
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struct idio_16_state {
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spinlock_t lock;
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DECLARE_BITMAP(out_state, IDIO_16_NOUT);
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};
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/**
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* idio_16_get_direction - get the I/O direction for a signal offset
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* @offset: offset of signal to get direction
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*
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* Returns the signal direction (0=output, 1=input) for the signal at @offset.
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*/
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static inline int idio_16_get_direction(const unsigned long offset)
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{
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return (offset >= IDIO_16_NOUT) ? 1 : 0;
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}
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int idio_16_get(struct idio_16 __iomem *reg, struct idio_16_state *state,
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unsigned long offset);
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void idio_16_get_multiple(struct idio_16 __iomem *reg,
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struct idio_16_state *state,
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const unsigned long *mask, unsigned long *bits);
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void idio_16_set(struct idio_16 __iomem *reg, struct idio_16_state *state,
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unsigned long offset, unsigned long value);
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void idio_16_set_multiple(struct idio_16 __iomem *reg,
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struct idio_16_state *state,
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const unsigned long *mask, const unsigned long *bits);
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void idio_16_state_init(struct idio_16_state *state);
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#endif /* _IDIO_16_H_ */
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