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                 .compatible = "st,iis2mdc",
  46                 .data = IIS2MDC_MAGN_DEV_NAME,
  47         },
  48         {}
  49 };
  50 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  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_dev_name_probe(&spi->dev, spi->modalias, sizeof(spi->modalias));
  60
  61         settings = st_magn_get_settings(spi->modalias);
  62         if (!settings) {
  63                 dev_err(&spi->dev, "device name %s not recognized.\n",
  64                         spi->modalias);
  65                 return -ENODEV;
  66         }
  67
  68         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  69         if (!indio_dev)
  70                 return -ENOMEM;
  71
  72         mdata = iio_priv(indio_dev);
  73         mdata->sensor_settings = (struct st_sensor_settings *)settings;
  74
  75         err = st_sensors_spi_configure(indio_dev, spi);
  76         if (err < 0)
  77                 return err;
  78
  79         err = st_sensors_power_enable(indio_dev);
  80         if (err)
  81                 return err;
  82
  83         err = st_magn_common_probe(indio_dev);
  84         if (err < 0)
  85                 goto st_magn_power_off;
  86
  87         return 0;
  88
  89 st_magn_power_off:
  90         st_sensors_power_disable(indio_dev);
  91
  92         return err;
  93 }
  94
  95 static int st_magn_spi_remove(struct spi_device *spi)
  96 {
  97         struct iio_dev *indio_dev = spi_get_drvdata(spi);
  98
  99         st_sensors_power_disable(indio_dev);
 100
 101         st_magn_common_remove(indio_dev);
 102
 103         return 0;
 104 }
 105
 106 static const struct spi_device_id st_magn_id_table[] = {
 107         { LIS3MDL_MAGN_DEV_NAME },
 108         { LSM303AGR_MAGN_DEV_NAME },
 109         { LIS2MDL_MAGN_DEV_NAME },
 110         { LSM9DS1_MAGN_DEV_NAME },
 111         { IIS2MDC_MAGN_DEV_NAME },
 112         {},
 113 };
 114 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
 115
 116 static struct spi_driver st_magn_driver = {
 117         .driver = {
 118                 .name = "st-magn-spi",
 119                 .of_match_table = st_magn_of_match,
 120         },
 121         .probe = st_magn_spi_probe,
 122         .remove = st_magn_spi_remove,
 123         .id_table = st_magn_id_table,
 124 };
 125 module_spi_driver(st_magn_driver);
 126
 127 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 128 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
 129 MODULE_LICENSE("GPL v2");