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