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/mod_devicetable.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                 .compatible = "st,iis2mdc",
  46                 .data = IIS2MDC_MAGN_DEV_NAME,
  47         },
  48         {
  49                 .compatible = "st,lsm303c-magn",
  50                 .data = LSM303C_MAGN_DEV_NAME,
  51         },
  52         {}
  53 };
  54 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  55
  56 static int st_magn_spi_probe(struct spi_device *spi)
  57 {
  58         const struct st_sensor_settings *settings;
  59         struct st_sensor_data *mdata;
  60         struct iio_dev *indio_dev;
  61         int err;
  62
  63         st_sensors_dev_name_probe(&spi->dev, spi->modalias, sizeof(spi->modalias));
  64
  65         settings = st_magn_get_settings(spi->modalias);
  66         if (!settings) {
  67                 dev_err(&spi->dev, "device name %s not recognized.\n",
  68                         spi->modalias);
  69                 return -ENODEV;
  70         }
  71
  72         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  73         if (!indio_dev)
  74                 return -ENOMEM;
  75
  76         mdata = iio_priv(indio_dev);
  77         mdata->sensor_settings = (struct st_sensor_settings *)settings;
  78
  79         err = st_sensors_spi_configure(indio_dev, spi);
  80         if (err < 0)
  81                 return err;
  82
  83         err = st_sensors_power_enable(indio_dev);
  84         if (err)
  85                 return err;
  86
  87         return st_magn_common_probe(indio_dev);
  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         { IIS2MDC_MAGN_DEV_NAME },
  96         { LSM303C_MAGN_DEV_NAME },
  97         {},
  98 };
  99 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
 100
 101 static struct spi_driver st_magn_driver = {
 102         .driver = {
 103                 .name = "st-magn-spi",
 104                 .of_match_table = st_magn_of_match,
 105         },
 106         .probe = st_magn_spi_probe,
 107         .id_table = st_magn_id_table,
 108 };
 109 module_spi_driver(st_magn_driver);
 110
 111 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 112 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
 113 MODULE_LICENSE("GPL v2");
 114 MODULE_IMPORT_NS("IIO_ST_SENSORS");