1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/spi/spi.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include "rm3100.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun static const struct regmap_config rm3100_regmap_config = {
14*4882a593Smuzhiyun .reg_bits = 8,
15*4882a593Smuzhiyun .val_bits = 8,
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun .rd_table = &rm3100_readable_table,
18*4882a593Smuzhiyun .wr_table = &rm3100_writable_table,
19*4882a593Smuzhiyun .volatile_table = &rm3100_volatile_table,
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun .read_flag_mask = 0x80,
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun .cache_type = REGCACHE_RBTREE,
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
rm3100_probe(struct spi_device * spi)26*4882a593Smuzhiyun static int rm3100_probe(struct spi_device *spi)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct regmap *regmap;
29*4882a593Smuzhiyun int ret;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun /* Actually this device supports both mode 0 and mode 3. */
32*4882a593Smuzhiyun spi->mode = SPI_MODE_0;
33*4882a593Smuzhiyun /* Data rates cannot exceed 1Mbits. */
34*4882a593Smuzhiyun spi->max_speed_hz = 1000000;
35*4882a593Smuzhiyun spi->bits_per_word = 8;
36*4882a593Smuzhiyun ret = spi_setup(spi);
37*4882a593Smuzhiyun if (ret)
38*4882a593Smuzhiyun return ret;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
41*4882a593Smuzhiyun if (IS_ERR(regmap))
42*4882a593Smuzhiyun return PTR_ERR(regmap);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return rm3100_common_probe(&spi->dev, regmap, spi->irq);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun static const struct of_device_id rm3100_dt_match[] = {
48*4882a593Smuzhiyun { .compatible = "pni,rm3100", },
49*4882a593Smuzhiyun { }
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, rm3100_dt_match);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun static struct spi_driver rm3100_driver = {
54*4882a593Smuzhiyun .driver = {
55*4882a593Smuzhiyun .name = "rm3100-spi",
56*4882a593Smuzhiyun .of_match_table = rm3100_dt_match,
57*4882a593Smuzhiyun },
58*4882a593Smuzhiyun .probe = rm3100_probe,
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun module_spi_driver(rm3100_driver);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
63*4882a593Smuzhiyun MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
64*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
65