drivers/iio/humidity/hts221_spi.c

   1 /*
   2  * STMicroelectronics hts221 spi 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/spi/spi.h>
  14 #include <linux/slab.h>
  15 #include <linux/regmap.h>
  16
  17 #include "hts221.h"
  18
  19 #define HTS221_SPI_READ                 BIT(7)
  20 #define HTS221_SPI_AUTO_INCREMENT       BIT(6)
  21
  22 static const struct regmap_config hts221_spi_regmap_config = {
  23         .reg_bits = 8,
  24         .val_bits = 8,
  25         .write_flag_mask = HTS221_SPI_AUTO_INCREMENT,
  26         .read_flag_mask = HTS221_SPI_READ | HTS221_SPI_AUTO_INCREMENT,
  27 };
  28
  29 static int hts221_spi_probe(struct spi_device *spi)
  30 {
  31         struct regmap *regmap;
  32
  33         regmap = devm_regmap_init_spi(spi, &hts221_spi_regmap_config);
  34         if (IS_ERR(regmap)) {
  35                 dev_err(&spi->dev, "Failed to register spi regmap %d\n",
  36                         (int)PTR_ERR(regmap));
  37                 return PTR_ERR(regmap);
  38         }
  39
  40         return hts221_probe(&spi->dev, spi->irq,
  41                             spi->modalias, regmap);
  42 }
  43
  44 static const struct of_device_id hts221_spi_of_match[] = {
  45         { .compatible = "st,hts221", },
  46         {},
  47 };
  48 MODULE_DEVICE_TABLE(of, hts221_spi_of_match);
  49
  50 static const struct spi_device_id hts221_spi_id_table[] = {
  51         { HTS221_DEV_NAME },
  52         {},
  53 };
  54 MODULE_DEVICE_TABLE(spi, hts221_spi_id_table);
  55
  56 static struct spi_driver hts221_driver = {
  57         .driver = {
  58                 .name = "hts221_spi",
  59                 .pm = &hts221_pm_ops,
  60                 .of_match_table = of_match_ptr(hts221_spi_of_match),
  61         },
  62         .probe = hts221_spi_probe,
  63         .id_table = hts221_spi_id_table,
  64 };
  65 module_spi_driver(hts221_driver);
  66
  67 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
  68 MODULE_DESCRIPTION("STMicroelectronics hts221 spi driver");
  69 MODULE_LICENSE("GPL v2");