drivers/iio/humidity/hts221_i2c.c

   1 /*
   2  * STMicroelectronics hts221 i2c driver
   3  *
   4  * Copyright 2016 STMicroelectronics Inc.
   5  *
   6  * Lorenzo Bianconi <lorenzo.bianconi@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/acpi.h>
  14 #include <linux/i2c.h>
  15 #include <linux/slab.h>
  16 #include <linux/regmap.h>
  17
  18 #include "hts221.h"
  19
  20 #define HTS221_I2C_AUTO_INCREMENT       BIT(7)
  21
  22 static const struct regmap_config hts221_i2c_regmap_config = {
  23         .reg_bits = 8,
  24         .val_bits = 8,
  25         .write_flag_mask = HTS221_I2C_AUTO_INCREMENT,
  26         .read_flag_mask = HTS221_I2C_AUTO_INCREMENT,
  27 };
  28
  29 static int hts221_i2c_probe(struct i2c_client *client,
  30                             const struct i2c_device_id *id)
  31 {
  32         struct regmap *regmap;
  33
  34         regmap = devm_regmap_init_i2c(client, &hts221_i2c_regmap_config);
  35         if (IS_ERR(regmap)) {
  36                 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
  37                         (int)PTR_ERR(regmap));
  38                 return PTR_ERR(regmap);
  39         }
  40
  41         return hts221_probe(&client->dev, client->irq,
  42                             client->name, regmap);
  43 }
  44
  45 static const struct acpi_device_id hts221_acpi_match[] = {
  46         {"SMO9100", 0},
  47         { },
  48 };
  49 MODULE_DEVICE_TABLE(acpi, hts221_acpi_match);
  50
  51 static const struct of_device_id hts221_i2c_of_match[] = {
  52         { .compatible = "st,hts221", },
  53         {},
  54 };
  55 MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);
  56
  57 static const struct i2c_device_id hts221_i2c_id_table[] = {
  58         { HTS221_DEV_NAME },
  59         {},
  60 };
  61 MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
  62
  63 static struct i2c_driver hts221_driver = {
  64         .driver = {
  65                 .name = "hts221_i2c",
  66                 .pm = &hts221_pm_ops,
  67                 .of_match_table = of_match_ptr(hts221_i2c_of_match),
  68                 .acpi_match_table = ACPI_PTR(hts221_acpi_match),
  69         },
  70         .probe = hts221_i2c_probe,
  71         .id_table = hts221_i2c_id_table,
  72 };
  73 module_i2c_driver(hts221_driver);
  74
  75 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
  76 MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
  77 MODULE_LICENSE("GPL v2");