drivers/iio/magnetometer/st_magn_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics magnetometers driver
   4  *
   5  * Copyright 2012-2013 STMicroelectronics Inc.
   6  *
   7  * Denis Ciocca <denis.ciocca@st.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/spi/spi.h>
  14 #include <linux/iio/iio.h>
  15
  16 #include <linux/iio/common/st_sensors.h>
  17 #include <linux/iio/common/st_sensors_spi.h>
  18 #include "st_magn.h"
  19
  20 /*
  21  * For new single-chip sensors use <device_name> as compatible string.
  22  * For old single-chip devices keep <device_name>-magn to maintain
  23  * compatibility
  24  * For multi-chip devices, use <device_name>-magn to distinguish which
  25  * capability is being used
  26  */
  27 static const struct of_device_id st_magn_of_match[] = {
  28         {
  29                 .compatible = "st,lis3mdl-magn",
  30                 .data = LIS3MDL_MAGN_DEV_NAME,
  31         },
  32         {
  33                 .compatible = "st,lsm303agr-magn",
  34                 .data = LSM303AGR_MAGN_DEV_NAME,
  35         },
  36         {
  37                 .compatible = "st,lis2mdl",
  38                 .data = LIS2MDL_MAGN_DEV_NAME,
  39         },
  40         {
  41                 .compatible = "st,lsm9ds1-magn",
  42                 .data = LSM9DS1_MAGN_DEV_NAME,
  43         },
  44         {}
  45 };
  46 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  47
  48 static int st_magn_spi_probe(struct spi_device *spi)
  49 {
  50         const struct st_sensor_settings *settings;
  51         struct st_sensor_data *mdata;
  52         struct iio_dev *indio_dev;
  53         int err;
  54
  55         st_sensors_dev_name_probe(&spi->dev, spi->modalias, sizeof(spi->modalias));
  56
  57         settings = st_magn_get_settings(spi->modalias);
  58         if (!settings) {
  59                 dev_err(&spi->dev, "device name %s not recognized.\n",
  60                         spi->modalias);
  61                 return -ENODEV;
  62         }
  63
  64         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  65         if (!indio_dev)
  66                 return -ENOMEM;
  67
  68         mdata = iio_priv(indio_dev);
  69         mdata->sensor_settings = (struct st_sensor_settings *)settings;
  70
  71         err = st_sensors_spi_configure(indio_dev, spi);
  72         if (err < 0)
  73                 return err;
  74
  75         err = st_magn_common_probe(indio_dev);
  76         if (err < 0)
  77                 return err;
  78
  79         return 0;
  80 }
  81
  82 static int st_magn_spi_remove(struct spi_device *spi)
  83 {
  84         struct iio_dev *indio_dev = spi_get_drvdata(spi);
  85         st_magn_common_remove(indio_dev);
  86
  87         return 0;
  88 }
  89
  90 static const struct spi_device_id st_magn_id_table[] = {
  91         { LIS3MDL_MAGN_DEV_NAME },
  92         { LSM303AGR_MAGN_DEV_NAME },
  93         { LIS2MDL_MAGN_DEV_NAME },
  94         { LSM9DS1_MAGN_DEV_NAME },
  95         {},
  96 };
  97 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
  98
  99 static struct spi_driver st_magn_driver = {
 100         .driver = {
 101                 .name = "st-magn-spi",
 102                 .of_match_table = st_magn_of_match,
 103         },
 104         .probe = st_magn_spi_probe,
 105         .remove = st_magn_spi_remove,
 106         .id_table = st_magn_id_table,
 107 };
 108 module_spi_driver(st_magn_driver);
 109
 110 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 111 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
 112 MODULE_LICENSE("GPL v2");