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  * For multi-chip devices, use <device_name>-magn to distinguish which
  27  * capability is being used
  28  */
  29 static const struct of_device_id st_magn_of_match[] = {
  30         {
  31                 .compatible = "st,lis3mdl-magn",
  32                 .data = LIS3MDL_MAGN_DEV_NAME,
  33         },
  34         {
  35                 .compatible = "st,lsm303agr-magn",
  36                 .data = LSM303AGR_MAGN_DEV_NAME,
  37         },
  38         {
  39                 .compatible = "st,lis2mdl",
  40                 .data = LIS2MDL_MAGN_DEV_NAME,
  41         },
  42         {
  43                 .compatible = "st,lsm9ds1-magn",
  44                 .data = LSM9DS1_MAGN_DEV_NAME,
  45         },
  46         {}
  47 };
  48 MODULE_DEVICE_TABLE(of, st_magn_of_match);
  49 #else
  50 #define st_magn_of_match        NULL
  51 #endif
  52
  53 static int st_magn_spi_probe(struct spi_device *spi)
  54 {
  55         struct iio_dev *indio_dev;
  56         struct st_sensor_data *mdata;
  57         int err;
  58
  59         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
  60         if (!indio_dev)
  61                 return -ENOMEM;
  62
  63         mdata = iio_priv(indio_dev);
  64
  65         st_sensors_of_name_probe(&spi->dev, st_magn_of_match,
  66                                  spi->modalias, sizeof(spi->modalias));
  67         st_sensors_spi_configure(indio_dev, spi, mdata);
  68
  69         err = st_magn_common_probe(indio_dev);
  70         if (err < 0)
  71                 return err;
  72
  73         return 0;
  74 }
  75
  76 static int st_magn_spi_remove(struct spi_device *spi)
  77 {
  78         struct iio_dev *indio_dev = spi_get_drvdata(spi);
  79         st_magn_common_remove(indio_dev);
  80
  81         return 0;
  82 }
  83
  84 static const struct spi_device_id st_magn_id_table[] = {
  85         { LIS3MDL_MAGN_DEV_NAME },
  86         { LSM303AGR_MAGN_DEV_NAME },
  87         { LIS2MDL_MAGN_DEV_NAME },
  88         { LSM9DS1_MAGN_DEV_NAME },
  89         {},
  90 };
  91 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
  92
  93 static struct spi_driver st_magn_driver = {
  94         .driver = {
  95                 .name = "st-magn-spi",
  96                 .of_match_table = of_match_ptr(st_magn_of_match),
  97         },
  98         .probe = st_magn_spi_probe,
  99         .remove = st_magn_spi_remove,
 100         .id_table = st_magn_id_table,
 101 };
 102 module_spi_driver(st_magn_driver);
 103
 104 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 105 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
 106 MODULE_LICENSE("GPL v2");