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/mod_devicetable.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 		.compatible = "st,lsm303c-magn",
50 		.data = LSM303C_MAGN_DEV_NAME,
51 	},
52 	{}
53 };
54 MODULE_DEVICE_TABLE(of, st_magn_of_match);
55 
st_magn_spi_probe(struct spi_device * spi)56 static int st_magn_spi_probe(struct spi_device *spi)
57 {
58 	const struct st_sensor_settings *settings;
59 	struct st_sensor_data *mdata;
60 	struct iio_dev *indio_dev;
61 	int err;
62 
63 	st_sensors_dev_name_probe(&spi->dev, spi->modalias, sizeof(spi->modalias));
64 
65 	settings = st_magn_get_settings(spi->modalias);
66 	if (!settings) {
67 		dev_err(&spi->dev, "device name %s not recognized.\n",
68 			spi->modalias);
69 		return -ENODEV;
70 	}
71 
72 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*mdata));
73 	if (!indio_dev)
74 		return -ENOMEM;
75 
76 	mdata = iio_priv(indio_dev);
77 	mdata->sensor_settings = (struct st_sensor_settings *)settings;
78 
79 	err = st_sensors_spi_configure(indio_dev, spi);
80 	if (err < 0)
81 		return err;
82 
83 	err = st_sensors_power_enable(indio_dev);
84 	if (err)
85 		return err;
86 
87 	return st_magn_common_probe(indio_dev);
88 }
89 
90 static const struct spi_device_id st_magn_id_table[] = {
91 	{ LIS3MDL_MAGN_DEV_NAME },
92 	{ LSM303AGR_MAGN_DEV_NAME },
93 	{ LIS2MDL_MAGN_DEV_NAME },
94 	{ LSM9DS1_MAGN_DEV_NAME },
95 	{ IIS2MDC_MAGN_DEV_NAME },
96 	{ LSM303C_MAGN_DEV_NAME },
97 	{},
98 };
99 MODULE_DEVICE_TABLE(spi, st_magn_id_table);
100 
101 static struct spi_driver st_magn_driver = {
102 	.driver = {
103 		.name = "st-magn-spi",
104 		.of_match_table = st_magn_of_match,
105 	},
106 	.probe = st_magn_spi_probe,
107 	.id_table = st_magn_id_table,
108 };
109 module_spi_driver(st_magn_driver);
110 
111 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
112 MODULE_DESCRIPTION("STMicroelectronics magnetometers spi driver");
113 MODULE_LICENSE("GPL v2");
114 MODULE_IMPORT_NS(IIO_ST_SENSORS);
115