drivers/iio/adc/ad7091r5.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AD7091R5 Analog to Digital converter driver
   4  *
   5  * Copyright 2014-2019 Analog Devices Inc.
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/iio/iio.h>
  10 #include <linux/module.h>
  11 #include <linux/regmap.h>
  12
  13 #include "ad7091r-base.h"
  14
  15 static const struct iio_event_spec ad7091r5_events[] = {
  16         {
  17                 .type = IIO_EV_TYPE_THRESH,
  18                 .dir = IIO_EV_DIR_RISING,
  19                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
  20                                  BIT(IIO_EV_INFO_ENABLE),
  21         },
  22         {
  23                 .type = IIO_EV_TYPE_THRESH,
  24                 .dir = IIO_EV_DIR_FALLING,
  25                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
  26                                  BIT(IIO_EV_INFO_ENABLE),
  27         },
  28         {
  29                 .type = IIO_EV_TYPE_THRESH,
  30                 .dir = IIO_EV_DIR_EITHER,
  31                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
  32         },
  33 };
  34
  35 #define AD7091R_CHANNEL(idx, bits, ev, num_ev) { \
  36         .type = IIO_VOLTAGE, \
  37         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
  38         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
  39         .indexed = 1, \
  40         .channel = idx, \
  41         .event_spec = ev, \
  42         .num_event_specs = num_ev, \
  43         .scan_type.storagebits = 16, \
  44         .scan_type.realbits = bits, \
  45 }
  46 static const struct iio_chan_spec ad7091r5_channels_irq[] = {
  47         AD7091R_CHANNEL(0, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
  48         AD7091R_CHANNEL(1, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
  49         AD7091R_CHANNEL(2, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
  50         AD7091R_CHANNEL(3, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
  51 };
  52
  53 static const struct iio_chan_spec ad7091r5_channels_noirq[] = {
  54         AD7091R_CHANNEL(0, 12, NULL, 0),
  55         AD7091R_CHANNEL(1, 12, NULL, 0),
  56         AD7091R_CHANNEL(2, 12, NULL, 0),
  57         AD7091R_CHANNEL(3, 12, NULL, 0),
  58 };
  59
  60 static const struct ad7091r_chip_info ad7091r5_chip_info_irq = {
  61         .channels = ad7091r5_channels_irq,
  62         .num_channels = ARRAY_SIZE(ad7091r5_channels_irq),
  63         .vref_mV = 2500,
  64 };
  65
  66 static const struct ad7091r_chip_info ad7091r5_chip_info_noirq = {
  67         .channels = ad7091r5_channels_noirq,
  68         .num_channels = ARRAY_SIZE(ad7091r5_channels_noirq),
  69         .vref_mV = 2500,
  70 };
  71
  72 static int ad7091r5_i2c_probe(struct i2c_client *i2c,
  73                 const struct i2c_device_id *id)
  74 {
  75         const struct ad7091r_chip_info *chip_info;
  76         struct regmap *map = devm_regmap_init_i2c(i2c, &ad7091r_regmap_config);
  77
  78         if (IS_ERR(map))
  79                 return PTR_ERR(map);
  80
  81         if (i2c->irq)
  82                 chip_info = &ad7091r5_chip_info_irq;
  83         else
  84                 chip_info = &ad7091r5_chip_info_noirq;
  85
  86         return ad7091r_probe(&i2c->dev, id->name, chip_info, map, i2c->irq);
  87 }
  88
  89 static const struct of_device_id ad7091r5_dt_ids[] = {
  90         { .compatible = "adi,ad7091r5" },
  91         {},
  92 };
  93 MODULE_DEVICE_TABLE(of, ad7091r5_dt_ids);
  94
  95 static const struct i2c_device_id ad7091r5_i2c_ids[] = {
  96         {"ad7091r5", 0},
  97         {}
  98 };
  99 MODULE_DEVICE_TABLE(i2c, ad7091r5_i2c_ids);
 100
 101 static struct i2c_driver ad7091r5_driver = {
 102         .driver = {
 103                 .name = "ad7091r5",
 104                 .of_match_table = ad7091r5_dt_ids,
 105         },
 106         .probe = ad7091r5_i2c_probe,
 107         .id_table = ad7091r5_i2c_ids,
 108 };
 109 module_i2c_driver(ad7091r5_driver);
 110
 111 MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
 112 MODULE_DESCRIPTION("Analog Devices AD7091R5 multi-channel ADC driver");
 113 MODULE_LICENSE("GPL v2");