drivers/staging/iio/adc/ad799x.h

   1 /*
   2  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   3  * Copyright (C) 2008-2010 Jonathan Cameron
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * ad799x.h
  10  */
  11
  12 #ifndef _AD799X_H_
  13 #define  _AD799X_H_
  14
  15 #define AD799X_CHANNEL_SHIFT                    4
  16 #define AD799X_STORAGEBITS                      16
  17 /*
  18  * AD7991, AD7995 and AD7999 defines
  19  */
  20
  21 #define AD7991_REF_SEL                          0x08
  22 #define AD7991_FLTR                             0x04
  23 #define AD7991_BIT_TRIAL_DELAY                  0x02
  24 #define AD7991_SAMPLE_DELAY                     0x01
  25
  26 /*
  27  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  28  */
  29
  30 #define AD7998_FLTR                             0x08
  31 #define AD7998_ALERT_EN                         0x04
  32 #define AD7998_BUSY_ALERT                       0x02
  33 #define AD7998_BUSY_ALERT_POL                   0x01
  34
  35 #define AD7998_CONV_RES_REG                     0x0
  36 #define AD7998_ALERT_STAT_REG                   0x1
  37 #define AD7998_CONF_REG                         0x2
  38 #define AD7998_CYCLE_TMR_REG                    0x3
  39 #define AD7998_DATALOW_CH1_REG                  0x4
  40 #define AD7998_DATAHIGH_CH1_REG                 0x5
  41 #define AD7998_HYST_CH1_REG                     0x6
  42 #define AD7998_DATALOW_CH2_REG                  0x7
  43 #define AD7998_DATAHIGH_CH2_REG                 0x8
  44 #define AD7998_HYST_CH2_REG                     0x9
  45 #define AD7998_DATALOW_CH3_REG                  0xA
  46 #define AD7998_DATAHIGH_CH3_REG                 0xB
  47 #define AD7998_HYST_CH3_REG                     0xC
  48 #define AD7998_DATALOW_CH4_REG                  0xD
  49 #define AD7998_DATAHIGH_CH4_REG                 0xE
  50 #define AD7998_HYST_CH4_REG                     0xF
  51
  52 #define AD7998_CYC_MASK                         0x7
  53 #define AD7998_CYC_DIS                          0x0
  54 #define AD7998_CYC_TCONF_32                     0x1
  55 #define AD7998_CYC_TCONF_64                     0x2
  56 #define AD7998_CYC_TCONF_128                    0x3
  57 #define AD7998_CYC_TCONF_256                    0x4
  58 #define AD7998_CYC_TCONF_512                    0x5
  59 #define AD7998_CYC_TCONF_1024                   0x6
  60 #define AD7998_CYC_TCONF_2048                   0x7
  61
  62 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  63
  64 /*
  65  * AD7997 and AD7997 defines
  66  */
  67
  68 #define AD7997_8_READ_SINGLE                    0x80
  69 #define AD7997_8_READ_SEQUENCE                  0x70
  70 /* TODO: move this into a common header */
  71 #define RES_MASK(bits)  ((1 << (bits)) - 1)
  72
  73 enum {
  74         ad7991,
  75         ad7995,
  76         ad7999,
  77         ad7992,
  78         ad7993,
  79         ad7994,
  80         ad7997,
  81         ad7998
  82 };
  83
  84 struct ad799x_state;
  85
  86 /**
  87  * struct ad799x_chip_info - chip specifc information
  88  * @channel:            channel specification
  89  * @num_channels:       number of channels
  90  * @int_vref_mv:        the internal reference voltage
  91  * @monitor_mode:       whether the chip supports monitor interrupts
  92  * @default_config:     device default configuration
  93  * @event_attrs:        pointer to the monitor event attribute group
  94  */
  95
  96 struct ad799x_chip_info {
  97         struct iio_chan_spec            channel[9];
  98         int                             num_channels;
  99         u16                             int_vref_mv;
 100         u16                             default_config;
 101         const struct iio_info           *info;
 102 };
 103
 104 struct ad799x_state {
 105         struct i2c_client               *client;
 106         const struct ad799x_chip_info   *chip_info;
 107         size_t                          d_size;
 108         struct iio_trigger              *trig;
 109         struct regulator                *reg;
 110         u16                             int_vref_mv;
 111         unsigned                        id;
 112         char                            *name;
 113         u16                             config;
 114 };
 115
 116 /*
 117  * TODO: struct ad799x_platform_data needs to go into include/linux/iio
 118  */
 119
 120 struct ad799x_platform_data {
 121         u16                             vref_mv;
 122 };
 123
 124 int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask);
 125
 126 #ifdef CONFIG_AD799X_RING_BUFFER
 127 int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum);
 128 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
 129 void ad799x_ring_cleanup(struct iio_dev *indio_dev);
 130 #else /* CONFIG_AD799X_RING_BUFFER */
 131 int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum)
 132 {
 133         return -EINVAL;
 134 }
 135
 136
 137 static inline int
 138 ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 139 {
 140         return 0;
 141 }
 142
 143 static inline void ad799x_ring_cleanup(struct iio_dev *indio_dev)
 144 {
 145 }
 146 #endif /* CONFIG_AD799X_RING_BUFFER */
 147 #endif /* _AD799X_H_ */