projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b9b1fc1a WBG |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* Copyright 2022 William Breathitt Gray */ | |
| 3 | #ifndef _IDIO_16_H_ | |
| 4 | #define _IDIO_16_H_ | |
| 5 | ||
| 6 | #include <linux/spinlock.h> | |
| 7 | #include <linux/types.h> | |
| 8 | ||
| 9 | /** | |
| 10 | * struct idio_16 - IDIO-16 registers structure | |
| 11 | * @out0_7: Read: FET Drive Outputs 0-7 | |
| 12 | * Write: FET Drive Outputs 0-7 | |
| 13 | * @in0_7: Read: Isolated Inputs 0-7 | |
| 14 | * Write: Clear Interrupt | |
| 15 | * @irq_ctl: Read: Enable IRQ | |
| 16 | * Write: Disable IRQ | |
| 17 | * @filter_ctl: Read: Activate Input Filters 0-15 | |
| 18 | * Write: Deactivate Input Filters 0-15 | |
| 19 | * @out8_15: Read: FET Drive Outputs 8-15 | |
| 20 | * Write: FET Drive Outputs 8-15 | |
| 21 | * @in8_15: Read: Isolated Inputs 8-15 | |
| 22 | * Write: Unused | |
| 23 | * @irq_status: Read: Interrupt status | |
| 24 | * Write: Unused | |
| 25 | */ | |
| 26 | struct idio_16 { | |
| 27 | u8 out0_7; | |
| 28 | u8 in0_7; | |
| 29 | u8 irq_ctl; | |
| 30 | u8 filter_ctl; | |
| 31 | u8 out8_15; | |
| 32 | u8 in8_15; | |
| 33 | u8 irq_status; | |
| 34 | }; | |
| 35 | ||
| 36 | #define IDIO_16_NOUT 16 | |
| 37 | ||
| 38 | /** | |
| 39 | * struct idio_16_state - IDIO-16 state structure | |
| 40 | * @lock: synchronization lock for accessing device state | |
| 41 | * @out_state: output signals state | |
| 42 | */ | |
| 43 | struct idio_16_state { | |
| 44 | spinlock_t lock; | |
| 45 | DECLARE_BITMAP(out_state, IDIO_16_NOUT); | |
| 46 | }; | |
| 47 | ||
| 48 | /** | |
| 49 | * idio_16_get_direction - get the I/O direction for a signal offset | |
| 50 | * @offset: offset of signal to get direction | |
| 51 | * | |
| 52 | * Returns the signal direction (0=output, 1=input) for the signal at @offset. | |
| 53 | */ | |
| 54 | static inline int idio_16_get_direction(const unsigned long offset) | |
| 55 | { | |
| 56 | return (offset >= IDIO_16_NOUT) ? 1 : 0; | |
| 57 | } | |
| 58 | ||
| 59 | int idio_16_get(struct idio_16 __iomem *reg, struct idio_16_state *state, | |
| 60 | unsigned long offset); | |
| 61 | void idio_16_get_multiple(struct idio_16 __iomem *reg, | |
| 62 | struct idio_16_state *state, | |
| 63 | const unsigned long *mask, unsigned long *bits); | |
| 64 | void idio_16_set(struct idio_16 __iomem *reg, struct idio_16_state *state, | |
| 65 | unsigned long offset, unsigned long value); | |
| 66 | void idio_16_set_multiple(struct idio_16 __iomem *reg, | |
| 67 | struct idio_16_state *state, | |
| 68 | const unsigned long *mask, const unsigned long *bits); | |
| 69 | void idio_16_state_init(struct idio_16_state *state); | |
| 70 | ||
| 71 | #endif /* _IDIO_16_H_ */ |