rm3100-spi.c

 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
13static 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
26static 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	ret = spi_setup(spi);
36	if (ret)
37		return ret;
38
39	regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
40	if (IS_ERR(regmap))
41		return PTR_ERR(regmap);
42
43	return rm3100_common_probe(&spi->dev, regmap, spi->irq);
44}
45
46static const struct of_device_id rm3100_dt_match[] = {
47	{ .compatible = "pni,rm3100", },
48	{ }
49};
50MODULE_DEVICE_TABLE(of, rm3100_dt_match);
51
52static struct spi_driver rm3100_driver = {
53	.driver = {
54		.name = "rm3100-spi",
55		.of_match_table = rm3100_dt_match,
56	},
57	.probe = rm3100_probe,
58};
59module_spi_driver(rm3100_driver);
60
61MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
62MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
63MODULE_LICENSE("GPL v2");
64MODULE_IMPORT_NS("IIO_RM3100");