root/drivers/iio/dac/ad5696-i2c.c

DEFINITIONS

1. ad5686_i2c_read
2. ad5686_i2c_write
3. ad5686_i2c_probe
4. ad5686_i2c_remove

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,
   4  * AD5694, AD5694R, AD5695R, AD5696, AD5696R
   5  * Digital to analog converters driver
   6  *
   7  * Copyright 2018 Analog Devices Inc.
   8  */
   9 
  10 #include "ad5686.h"
  11 
  12 #include <linux/module.h>
  13 #include <linux/i2c.h>
  14 
  15 static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
  16 {
  17         struct i2c_client *i2c = to_i2c_client(st->dev);
  18         struct i2c_msg msg[2] = {
  19                 {
  20                         .addr = i2c->addr,
  21                         .flags = i2c->flags,
  22                         .len = 3,
  23                         .buf = &st->data[0].d8[1],
  24                 },
  25                 {
  26                         .addr = i2c->addr,
  27                         .flags = i2c->flags | I2C_M_RD,
  28                         .len = 2,
  29                         .buf = (char *)&st->data[0].d16,
  30                 },
  31         };
  32         int ret;
  33 
  34         st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
  35                                       AD5686_ADDR(addr) |
  36                                       0x00);
  37 
  38         ret = i2c_transfer(i2c->adapter, msg, 2);
  39         if (ret < 0)
  40                 return ret;
  41 
  42         return be16_to_cpu(st->data[0].d16);
  43 }
  44 
  45 static int ad5686_i2c_write(struct ad5686_state *st,
  46                             u8 cmd, u8 addr, u16 val)
  47 {
  48         struct i2c_client *i2c = to_i2c_client(st->dev);
  49         int ret;
  50 
  51         st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
  52                                       | val);
  53 
  54         ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
  55         if (ret < 0)
  56                 return ret;
  57 
  58         return (ret != 3) ? -EIO : 0;
  59 }
  60 
  61 static int ad5686_i2c_probe(struct i2c_client *i2c,
  62                             const struct i2c_device_id *id)
  63 {
  64         return ad5686_probe(&i2c->dev, id->driver_data, id->name,
  65                             ad5686_i2c_write, ad5686_i2c_read);
  66 }
  67 
  68 static int ad5686_i2c_remove(struct i2c_client *i2c)
  69 {
  70         return ad5686_remove(&i2c->dev);
  71 }
  72 
  73 static const struct i2c_device_id ad5686_i2c_id[] = {
  74         {"ad5311r", ID_AD5311R},
  75         {"ad5671r", ID_AD5671R},
  76         {"ad5675r", ID_AD5675R},
  77         {"ad5691r", ID_AD5691R},
  78         {"ad5692r", ID_AD5692R},
  79         {"ad5693", ID_AD5693},
  80         {"ad5693r", ID_AD5693R},
  81         {"ad5694", ID_AD5694},
  82         {"ad5694r", ID_AD5694R},
  83         {"ad5695r", ID_AD5695R},
  84         {"ad5696", ID_AD5696},
  85         {"ad5696r", ID_AD5696R},
  86         {}
  87 };
  88 MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
  89 
  90 static struct i2c_driver ad5686_i2c_driver = {
  91         .driver = {
  92                 .name = "ad5696",
  93         },
  94         .probe = ad5686_i2c_probe,
  95         .remove = ad5686_i2c_remove,
  96         .id_table = ad5686_i2c_id,
  97 };
  98 
  99 module_i2c_driver(ad5686_i2c_driver);
 100 
 101 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
 102 MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
 103 MODULE_LICENSE("GPL v2");