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