drivers/iio/humidity/hts221_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics hts221 spi driver
   4  *
   5  * Copyright 2016 STMicroelectronics Inc.
   6  *
   7  * Lorenzo Bianconi <lorenzo.bianconi@st.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/spi/spi.h>
  13 #include <linux/slab.h>
  14 #include <linux/regmap.h>
  15
  16 #include "hts221.h"
  17
  18 #define HTS221_SPI_READ                 BIT(7)
  19 #define HTS221_SPI_AUTO_INCREMENT       BIT(6)
  20
  21 static const struct regmap_config hts221_spi_regmap_config = {
  22         .reg_bits = 8,
  23         .val_bits = 8,
  24         .write_flag_mask = HTS221_SPI_AUTO_INCREMENT,
  25         .read_flag_mask = HTS221_SPI_READ | HTS221_SPI_AUTO_INCREMENT,
  26 };
  27
  28 static int hts221_spi_probe(struct spi_device *spi)
  29 {
  30         struct regmap *regmap;
  31
  32         regmap = devm_regmap_init_spi(spi, &hts221_spi_regmap_config);
  33         if (IS_ERR(regmap)) {
  34                 dev_err(&spi->dev, "Failed to register spi regmap %ld\n",
  35                         PTR_ERR(regmap));
  36                 return PTR_ERR(regmap);
  37         }
  38
  39         return hts221_probe(&spi->dev, spi->irq,
  40                             spi->modalias, regmap);
  41 }
  42
  43 static const struct of_device_id hts221_spi_of_match[] = {
  44         { .compatible = "st,hts221", },
  45         {},
  46 };
  47 MODULE_DEVICE_TABLE(of, hts221_spi_of_match);
  48
  49 static const struct spi_device_id hts221_spi_id_table[] = {
  50         { HTS221_DEV_NAME },
  51         {},
  52 };
  53 MODULE_DEVICE_TABLE(spi, hts221_spi_id_table);
  54
  55 static struct spi_driver hts221_driver = {
  56         .driver = {
  57                 .name = "hts221_spi",
  58                 .pm = &hts221_pm_ops,
  59                 .of_match_table = hts221_spi_of_match,
  60         },
  61         .probe = hts221_spi_probe,
  62         .id_table = hts221_spi_id_table,
  63 };
  64 module_spi_driver(hts221_driver);
  65
  66 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
  67 MODULE_DESCRIPTION("STMicroelectronics hts221 spi driver");
  68 MODULE_LICENSE("GPL v2");