drivers/iio/magnetometer/st_magn_spi.c

   1 /*
   2  * STMicroelectronics magnetometers driver
   3  *
   4  * Copyright 2012-2013 STMicroelectronics Inc.
   5  *
   6  * Denis Ciocca <denis.ciocca@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/iio/iio.h>
  16
  17 #include <linux/iio/common/st_sensors.h>
  18 #include <linux/iio/common/st_sensors_spi.h>
  19 #include "st_magn.h"
  20
  21 #ifdef CONFIG_OF
  22 /*
  23  * For new single-chip sensors use <device_name> as compatible string.
  24  * For old single-chip devices keep <device_name>-magn to maintain
  25  * compatibility
  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 };
  42 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  43 #else
  44 #define st_magn_of_match        NULL
  45 #endif
  46
  47 static int st_magn_spi_probe(struct spi_device *spi)
  48 {
  49         struct iio_dev *indio_dev;
  50         struct st_sensor_data *mdata;
  51         int err;
  52
  53         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  54         if (!indio_dev)
  55                 return -ENOMEM;
  56
  57         mdata = iio_priv(indio_dev);
  58
  59         st_sensors_of_name_probe(&spi->dev, st_magn_of_match,
  60                                  spi->modalias, sizeof(spi->modalias));
  61         st_sensors_spi_configure(indio_dev, spi, mdata);
  62
  63         err = st_magn_common_probe(indio_dev);
  64         if (err < 0)
  65                 return err;
  66
  67         return 0;
  68 }
  69
  70 static int st_magn_spi_remove(struct spi_device *spi)
  71 {
  72         struct iio_dev *indio_dev = spi_get_drvdata(spi);
  73         st_magn_common_remove(indio_dev);
  74
  75         return 0;
  76 }
  77
  78 static const struct spi_device_id st_magn_id_table[] = {
  79         { LIS3MDL_MAGN_DEV_NAME },
  80         { LSM303AGR_MAGN_DEV_NAME },
  81         { LIS2MDL_MAGN_DEV_NAME },
  82         {},
  83 };
  84 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
  85
  86 static struct spi_driver st_magn_driver = {
  87         .driver = {
  88                 .name = "st-magn-spi",
  89                 .of_match_table = of_match_ptr(st_magn_of_match),
  90         },
  91         .probe = st_magn_spi_probe,
  92         .remove = st_magn_spi_remove,
  93         .id_table = st_magn_id_table,
  94 };
  95 module_spi_driver(st_magn_driver);
  96
  97 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  98 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
  99 MODULE_LICENSE("GPL v2");