include/linux/platform_data/ad7793.h

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