drivers/iio/accel/adxl367_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2021 Analog Devices, Inc.
   4  * Author: Cosmin Tanislav <cosmin.tanislav@analog.com>
   5  */
   6
   7 #include <linux/i2c.h>
   8 #include <linux/mod_devicetable.h>
   9 #include <linux/module.h>
  10 #include <linux/regmap.h>
  11
  12 #include "adxl367.h"
  13
  14 #define ADXL367_I2C_FIFO_DATA   0x18
  15
  16 struct adxl367_i2c_state {
  17         struct regmap *regmap;
  18 };
  19
  20 static bool adxl367_readable_noinc_reg(struct device *dev, unsigned int reg)
  21 {
  22         return reg == ADXL367_I2C_FIFO_DATA;
  23 }
  24
  25 static int adxl367_i2c_read_fifo(void *context, __be16 *fifo_buf,
  26                                  unsigned int fifo_entries)
  27 {
  28         struct adxl367_i2c_state *st = context;
  29
  30         return regmap_noinc_read(st->regmap, ADXL367_I2C_FIFO_DATA, fifo_buf,
  31                                  fifo_entries * sizeof(*fifo_buf));
  32 }
  33
  34 static const struct regmap_config adxl367_i2c_regmap_config = {
  35         .reg_bits = 8,
  36         .val_bits = 8,
  37         .readable_noinc_reg = adxl367_readable_noinc_reg,
  38 };
  39
  40 static const struct adxl367_ops adxl367_i2c_ops = {
  41         .read_fifo = adxl367_i2c_read_fifo,
  42 };
  43
  44 static int adxl367_i2c_probe(struct i2c_client *client)
  45 {
  46         struct adxl367_i2c_state *st;
  47         struct regmap *regmap;
  48
  49         st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
  50         if (!st)
  51                 return -ENOMEM;
  52
  53         regmap = devm_regmap_init_i2c(client, &adxl367_i2c_regmap_config);
  54         if (IS_ERR(regmap))
  55                 return PTR_ERR(regmap);
  56
  57         st->regmap = regmap;
  58
  59         return adxl367_probe(&client->dev, &adxl367_i2c_ops, st, regmap,
  60                              client->irq);
  61 }
  62
  63 static const struct i2c_device_id adxl367_i2c_id[] = {
  64         { "adxl367" },
  65         { }
  66 };
  67 MODULE_DEVICE_TABLE(i2c, adxl367_i2c_id);
  68
  69 static const struct of_device_id adxl367_of_match[] = {
  70         { .compatible = "adi,adxl367" },
  71         { },
  72 };
  73 MODULE_DEVICE_TABLE(of, adxl367_of_match);
  74
  75 static struct i2c_driver adxl367_i2c_driver = {
  76         .driver = {
  77                 .name = "adxl367_i2c",
  78                 .of_match_table = adxl367_of_match,
  79         },
  80         .probe = adxl367_i2c_probe,
  81         .id_table = adxl367_i2c_id,
  82 };
  83
  84 module_i2c_driver(adxl367_i2c_driver);
  85
  86 MODULE_IMPORT_NS(IIO_ADXL367);
  87 MODULE_AUTHOR("Cosmin Tanislav <cosmin.tanislav@analog.com>");
  88 MODULE_DESCRIPTION("Analog Devices ADXL367 3-axis accelerometer I2C driver");
  89 MODULE_LICENSE("GPL");