1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
4  *
5  * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
6  */
7 
8 #include <linux/module.h>
9 #include <linux/spi/spi.h>
10 
11 #include "rm3100.h"
12 
13 static const struct regmap_config rm3100_regmap_config = {
14 	.reg_bits = 8,
15 	.val_bits = 8,
16 
17 	.rd_table = &rm3100_readable_table,
18 	.wr_table = &rm3100_writable_table,
19 	.volatile_table = &rm3100_volatile_table,
20 
21 	.read_flag_mask = 0x80,
22 
23 	.cache_type = REGCACHE_RBTREE,
24 };
25 
26 static int rm3100_probe(struct spi_device *spi)
27 {
28 	struct regmap *regmap;
29 	int ret;
30 
31 	/* Actually this device supports both mode 0 and mode 3. */
32 	spi->mode = SPI_MODE_0;
33 	/* Data rates cannot exceed 1Mbits. */
34 	spi->max_speed_hz = 1000000;
35 	spi->bits_per_word = 8;
36 	ret = spi_setup(spi);
37 	if (ret)
38 		return ret;
39 
40 	regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
41 	if (IS_ERR(regmap))
42 		return PTR_ERR(regmap);
43 
44 	return rm3100_common_probe(&spi->dev, regmap, spi->irq);
45 }
46 
47 static const struct of_device_id rm3100_dt_match[] = {
48 	{ .compatible = "pni,rm3100", },
49 	{ }
50 };
51 MODULE_DEVICE_TABLE(of, rm3100_dt_match);
52 
53 static struct spi_driver rm3100_driver = {
54 	.driver = {
55 		.name = "rm3100-spi",
56 		.of_match_table = rm3100_dt_match,
57 	},
58 	.probe = rm3100_probe,
59 };
60 module_spi_driver(rm3100_driver);
61 
62 MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
63 MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
64 MODULE_LICENSE("GPL v2");
65