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"); 118