1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /**
3  * Copyright (c) 2011 Jonathan Cameron
4  *
5  * Join together the various functionality of iio_simple_dummy driver
6  */
7 
8 #ifndef _IIO_SIMPLE_DUMMY_H_
9 #define _IIO_SIMPLE_DUMMY_H_
10 #include <linux/kernel.h>
11 
12 struct iio_dummy_accel_calibscale;
13 struct iio_dummy_regs;
14 
15 /**
16  * struct iio_dummy_state - device instance specific state.
17  * @dac_val:			cache for dac value
18  * @single_ended_adc_val:	cache for single ended adc value
19  * @differential_adc_val:	cache for differential adc value
20  * @accel_val:			cache for acceleration value
21  * @accel_calibbias:		cache for acceleration calibbias
22  * @accel_calibscale:		cache for acceleration calibscale
23  * @lock:			lock to ensure state is consistent
24  * @event_irq:			irq number for event line (faked)
25  * @event_val:			cache for event threshold value
26  * @event_en:			cache of whether event is enabled
27  */
28 struct iio_dummy_state {
29 	int dac_val;
30 	int single_ended_adc_val;
31 	int differential_adc_val[2];
32 	int accel_val;
33 	int accel_calibbias;
34 	int activity_running;
35 	int activity_walking;
36 	const struct iio_dummy_accel_calibscale *accel_calibscale;
37 	struct mutex lock;
38 	struct iio_dummy_regs *regs;
39 	int steps_enabled;
40 	int steps;
41 	int height;
42 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
43 	int event_irq;
44 	int event_val;
45 	bool event_en;
46 	s64 event_timestamp;
47 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
48 };
49 
50 #ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
51 
52 struct iio_dev;
53 
54 int iio_simple_dummy_read_event_config(struct iio_dev *indio_dev,
55 				       const struct iio_chan_spec *chan,
56 				       enum iio_event_type type,
57 				       enum iio_event_direction dir);
58 
59 int iio_simple_dummy_write_event_config(struct iio_dev *indio_dev,
60 					const struct iio_chan_spec *chan,
61 					enum iio_event_type type,
62 					enum iio_event_direction dir,
63 					int state);
64 
65 int iio_simple_dummy_read_event_value(struct iio_dev *indio_dev,
66 				      const struct iio_chan_spec *chan,
67 				      enum iio_event_type type,
68 				      enum iio_event_direction dir,
69 				      enum iio_event_info info, int *val,
70 				      int *val2);
71 
72 int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
73 				       const struct iio_chan_spec *chan,
74 				       enum iio_event_type type,
75 				       enum iio_event_direction dir,
76 				       enum iio_event_info info, int val,
77 				       int val2);
78 
79 int iio_simple_dummy_events_register(struct iio_dev *indio_dev);
80 void iio_simple_dummy_events_unregister(struct iio_dev *indio_dev);
81 
82 #else /* Stubs for when events are disabled at compile time */
83 
84 static inline int
85 iio_simple_dummy_events_register(struct iio_dev *indio_dev)
86 {
87 	return 0;
88 }
89 
90 static inline void
91 iio_simple_dummy_events_unregister(struct iio_dev *indio_dev)
92 {}
93 
94 #endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS*/
95 
96 /**
97  * enum iio_simple_dummy_scan_elements - scan index enum
98  * @DUMMY_INDEX_VOLTAGE_0:         the single ended voltage channel
99  * @DUMMY_INDEX_DIFFVOLTAGE_1M2:   first differential channel
100  * @DUMMY_INDEX_DIFFVOLTAGE_3M4:   second differential channel
101  * @DUMMY_INDEX_ACCELX:            acceleration channel
102  *
103  * Enum provides convenient numbering for the scan index.
104  */
105 enum iio_simple_dummy_scan_elements {
106 	DUMMY_INDEX_VOLTAGE_0,
107 	DUMMY_INDEX_DIFFVOLTAGE_1M2,
108 	DUMMY_INDEX_DIFFVOLTAGE_3M4,
109 	DUMMY_INDEX_ACCELX,
110 };
111 
112 #ifdef CONFIG_IIO_SIMPLE_DUMMY_BUFFER
113 int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev);
114 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev);
115 #else
116 static inline int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev)
117 {
118 	return 0;
119 }
120 
121 static inline
122 void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev)
123 {}
124 
125 #endif /* CONFIG_IIO_SIMPLE_DUMMY_BUFFER */
126 #endif /* _IIO_SIMPLE_DUMMY_H_ */
127