drivers/iio/dac/ad5593r.c

   1 /*
   2  * AD5593R Digital <-> Analog converters driver
   3  *
   4  * Copyright 2015-2016 Analog Devices Inc.
   5  * Author: Paul Cercueil <paul.cercueil@analog.com>
   6  *
   7  * Licensed under the GPL-2.
   8  */
   9
  10 #include "ad5592r-base.h"
  11
  12 #include <linux/bitops.h>
  13 #include <linux/i2c.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/acpi.h>
  17
  18 #define AD5593R_MODE_CONF               (0 << 4)
  19 #define AD5593R_MODE_DAC_WRITE          (1 << 4)
  20 #define AD5593R_MODE_ADC_READBACK       (4 << 4)
  21 #define AD5593R_MODE_DAC_READBACK       (5 << 4)
  22 #define AD5593R_MODE_GPIO_READBACK      (6 << 4)
  23 #define AD5593R_MODE_REG_READBACK       (7 << 4)
  24
  25 static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
  26 {
  27         struct i2c_client *i2c = to_i2c_client(st->dev);
  28
  29         return i2c_smbus_write_word_swapped(i2c,
  30                         AD5593R_MODE_DAC_WRITE | chan, value);
  31 }
  32
  33 static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
  34 {
  35         struct i2c_client *i2c = to_i2c_client(st->dev);
  36         s32 val;
  37
  38         val = i2c_smbus_write_word_swapped(i2c,
  39                         AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
  40         if (val < 0)
  41                 return (int) val;
  42
  43         val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK);
  44         if (val < 0)
  45                 return (int) val;
  46
  47         *value = (u16) val;
  48
  49         return 0;
  50 }
  51
  52 static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
  53 {
  54         struct i2c_client *i2c = to_i2c_client(st->dev);
  55
  56         return i2c_smbus_write_word_swapped(i2c,
  57                         AD5593R_MODE_CONF | reg, value);
  58 }
  59
  60 static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
  61 {
  62         struct i2c_client *i2c = to_i2c_client(st->dev);
  63         s32 val;
  64
  65         val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg);
  66         if (val < 0)
  67                 return (int) val;
  68
  69         *value = (u16) val;
  70
  71         return 0;
  72 }
  73
  74 static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
  75 {
  76         struct i2c_client *i2c = to_i2c_client(st->dev);
  77         s32 val;
  78
  79         val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK);
  80         if (val < 0)
  81                 return (int) val;
  82
  83         *value = (u8) val;
  84
  85         return 0;
  86 }
  87
  88 static const struct ad5592r_rw_ops ad5593r_rw_ops = {
  89         .write_dac = ad5593r_write_dac,
  90         .read_adc = ad5593r_read_adc,
  91         .reg_write = ad5593r_reg_write,
  92         .reg_read = ad5593r_reg_read,
  93         .gpio_read = ad5593r_gpio_read,
  94 };
  95
  96 static int ad5593r_i2c_probe(struct i2c_client *i2c,
  97                 const struct i2c_device_id *id)
  98 {
  99         return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
 100 }
 101
 102 static int ad5593r_i2c_remove(struct i2c_client *i2c)
 103 {
 104         return ad5592r_remove(&i2c->dev);
 105 }
 106
 107 static const struct i2c_device_id ad5593r_i2c_ids[] = {
 108         { .name = "ad5593r", },
 109         {},
 110 };
 111 MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
 112
 113 static const struct of_device_id ad5593r_of_match[] = {
 114         { .compatible = "adi,ad5593r", },
 115         {},
 116 };
 117 MODULE_DEVICE_TABLE(of, ad5593r_of_match);
 118
 119 static const struct acpi_device_id ad5593r_acpi_match[] = {
 120         {"ADS5593", },
 121         { },
 122 };
 123 MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
 124
 125 static struct i2c_driver ad5593r_driver = {
 126         .driver = {
 127                 .name = "ad5593r",
 128                 .of_match_table = of_match_ptr(ad5593r_of_match),
 129                 .acpi_match_table = ACPI_PTR(ad5593r_acpi_match),
 130         },
 131         .probe = ad5593r_i2c_probe,
 132         .remove = ad5593r_i2c_remove,
 133         .id_table = ad5593r_i2c_ids,
 134 };
 135 module_i2c_driver(ad5593r_driver);
 136
 137 MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
 138 MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
 139 MODULE_LICENSE("GPL v2");