1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * AD7792/AD7793 SPI ADC driver
4  *
5  * Copyright 2011 Analog Devices Inc.
6  */
7 #ifndef __LINUX_PLATFORM_DATA_AD7793_H__
8 #define __LINUX_PLATFORM_DATA_AD7793_H__
9 
10 /**
11  * enum ad7793_clock_source - AD7793 clock source selection
12  * @AD7793_CLK_SRC_INT: Internal 64 kHz clock, not available at the CLK pin.
13  * @AD7793_CLK_SRC_INT_CO: Internal 64 kHz clock, available at the CLK pin.
14  * @AD7793_CLK_SRC_EXT: Use external clock.
15  * @AD7793_CLK_SRC_EXT_DIV2: Use external clock divided by 2.
16  */
17 enum ad7793_clock_source {
18 	AD7793_CLK_SRC_INT,
19 	AD7793_CLK_SRC_INT_CO,
20 	AD7793_CLK_SRC_EXT,
21 	AD7793_CLK_SRC_EXT_DIV2,
22 };
23 
24 /**
25  * enum ad7793_bias_voltage - AD7793 bias voltage selection
26  * @AD7793_BIAS_VOLTAGE_DISABLED: Bias voltage generator disabled
27  * @AD7793_BIAS_VOLTAGE_AIN1: Bias voltage connected to AIN1(-).
28  * @AD7793_BIAS_VOLTAGE_AIN2: Bias voltage connected to AIN2(-).
29  * @AD7793_BIAS_VOLTAGE_AIN3: Bias voltage connected to AIN3(-).
30  *	Only valid for AD7795/AD7796.
31  */
32 enum ad7793_bias_voltage {
33 	AD7793_BIAS_VOLTAGE_DISABLED,
34 	AD7793_BIAS_VOLTAGE_AIN1,
35 	AD7793_BIAS_VOLTAGE_AIN2,
36 	AD7793_BIAS_VOLTAGE_AIN3,
37 };
38 
39 /**
40  * enum ad7793_refsel - AD7793 reference voltage selection
41  * @AD7793_REFSEL_REFIN1: External reference applied between REFIN1(+)
42  *	and REFIN1(-).
43  * @AD7793_REFSEL_REFIN2: External reference applied between REFIN2(+)
44  *	and REFIN1(-). Only valid for AD7795/AD7796.
45  * @AD7793_REFSEL_INTERNAL: Internal 1.17 V reference.
46  */
47 enum ad7793_refsel {
48 	AD7793_REFSEL_REFIN1 = 0,
49 	AD7793_REFSEL_REFIN2 = 1,
50 	AD7793_REFSEL_INTERNAL = 2,
51 };
52 
53 /**
54  * enum ad7793_current_source_direction - AD7793 excitation current direction
55  * @AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2: Current source IEXC1 connected to pin
56  *	IOUT1, current source IEXC2 connected to pin IOUT2.
57  * @AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1: Current source IEXC2 connected to pin
58  *	IOUT1, current source IEXC1 connected to pin IOUT2.
59  * @AD7793_IEXEC1_IEXEC2_IOUT1: Both current sources connected to pin IOUT1.
60  *	Only valid when the current sources are set to 10 uA or 210 uA.
61  * @AD7793_IEXEC1_IEXEC2_IOUT2: Both current sources connected to Pin IOUT2.
62  *	Only valid when the current ources are set to 10 uA or 210 uA.
63  */
64 enum ad7793_current_source_direction {
65 	AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2 = 0,
66 	AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1 = 1,
67 	AD7793_IEXEC1_IEXEC2_IOUT1 = 2,
68 	AD7793_IEXEC1_IEXEC2_IOUT2 = 3,
69 };
70 
71 /**
72  * enum ad7793_excitation_current - AD7793 excitation current selection
73  * @AD7793_IX_DISABLED: Excitation current Disabled.
74  * @AD7793_IX_10uA: Enable 10 micro-ampere excitation current.
75  * @AD7793_IX_210uA: Enable 210 micro-ampere excitation current.
76  * @AD7793_IX_1mA: Enable 1 milli-Ampere excitation current.
77  */
78 enum ad7793_excitation_current {
79 	AD7793_IX_DISABLED = 0,
80 	AD7793_IX_10uA = 1,
81 	AD7793_IX_210uA = 2,
82 	AD7793_IX_1mA = 3,
83 };
84 
85 /**
86  * struct ad7793_platform_data - AD7793 platform data
87  * @clock_src: Clock source selection
88  * @burnout_current: If set to true the 100nA burnout current is enabled.
89  * @boost_enable: Enable boost for the bias voltage generator.
90  * @buffered: If set to true configure the device for buffered input mode.
91  * @unipolar: If set to true sample in unipolar mode, if set to false sample in
92  *		bipolar mode.
93  * @refsel: Reference voltage selection
94  * @bias_voltage: Bias voltage selection
95  * @exitation_current: Excitation current selection
96  * @current_source_direction: Excitation current direction selection
97  */
98 struct ad7793_platform_data {
99 	enum ad7793_clock_source clock_src;
100 	bool burnout_current;
101 	bool boost_enable;
102 	bool buffered;
103 	bool unipolar;
104 
105 	enum ad7793_refsel refsel;
106 	enum ad7793_bias_voltage bias_voltage;
107 	enum ad7793_excitation_current exitation_current;
108 	enum ad7793_current_source_direction current_source_direction;
109 };
110 
111 #endif /* IIO_ADC_AD7793_H_ */
112