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 #ifdef CONFIG_OF
  21 /*
  22  * For new single-chip sensors use <device_name> as compatible string.
  23  * For old single-chip devices keep <device_name>-magn to maintain
  24  * compatibility
  25  * For multi-chip devices, use <device_name>-magn to distinguish which
  26  * capability is being used
  27  */
  28 static const struct of_device_id st_magn_of_match[] = {
  29         {
  30                 .compatible = "st,lis3mdl-magn",
  31                 .data = LIS3MDL_MAGN_DEV_NAME,
  32         },
  33         {
  34                 .compatible = "st,lsm303agr-magn",
  35                 .data = LSM303AGR_MAGN_DEV_NAME,
  36         },
  37         {
  38                 .compatible = "st,lis2mdl",
  39                 .data = LIS2MDL_MAGN_DEV_NAME,
  40         },
  41         {
  42                 .compatible = "st,lsm9ds1-magn",
  43                 .data = LSM9DS1_MAGN_DEV_NAME,
  44         },
  45         {}
  46 };
  47 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  48 #else
  49 #define st_magn_of_match        NULL
  50 #endif
  51
  52 static int st_magn_spi_probe(struct spi_device *spi)
  53 {
  54         const struct st_sensor_settings *settings;
  55         struct st_sensor_data *mdata;
  56         struct iio_dev *indio_dev;
  57         int err;
  58
  59         st_sensors_of_name_probe(&spi->dev, st_magn_of_match,
  60                                  spi->modalias, sizeof(spi->modalias));
  61
  62         settings = st_magn_get_settings(spi->modalias);
  63         if (!settings) {
  64                 dev_err(&spi->dev, "device name %s not recognized.\n",
  65                         spi->modalias);
  66                 return -ENODEV;
  67         }
  68
  69         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  70         if (!indio_dev)
  71                 return -ENOMEM;
  72
  73         mdata = iio_priv(indio_dev);
  74         mdata->sensor_settings = (struct st_sensor_settings *)settings;
  75
  76         err = st_sensors_spi_configure(indio_dev, spi);
  77         if (err < 0)
  78                 return err;
  79
  80         err = st_magn_common_probe(indio_dev);
  81         if (err < 0)
  82                 return err;
  83
  84         return 0;
  85 }
  86
  87 static int st_magn_spi_remove(struct spi_device *spi)
  88 {
  89         struct iio_dev *indio_dev = spi_get_drvdata(spi);
  90         st_magn_common_remove(indio_dev);
  91
  92         return 0;
  93 }
  94
  95 static const struct spi_device_id st_magn_id_table[] = {
  96         { LIS3MDL_MAGN_DEV_NAME },
  97         { LSM303AGR_MAGN_DEV_NAME },
  98         { LIS2MDL_MAGN_DEV_NAME },
  99         { LSM9DS1_MAGN_DEV_NAME },
 100         {},
 101 };
 102 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
 103
 104 static struct spi_driver st_magn_driver = {
 105         .driver = {
 106                 .name = "st-magn-spi",
 107                 .of_match_table = of_match_ptr(st_magn_of_match),
 108         },
 109         .probe = st_magn_spi_probe,
 110         .remove = st_magn_spi_remove,
 111         .id_table = st_magn_id_table,
 112 };
 113 module_spi_driver(st_magn_driver);
 114
 115 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 116 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
 117 MODULE_LICENSE("GPL v2");