tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SPI driver for hmc5983
4 *
5 * Copyright (C) Josef Gajdusek <atx@atx.name>
6 */
7
8#include <linux/module.h>
9#include <linux/spi/spi.h>
10#include <linux/iio/iio.h>
11
12#include "hmc5843.h"
13
14static const struct regmap_range hmc5843_readable_ranges[] = {
15 regmap_reg_range(0, HMC5843_ID_END),
16};
17
18static const struct regmap_access_table hmc5843_readable_table = {
19 .yes_ranges = hmc5843_readable_ranges,
20 .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
21};
22
23static const struct regmap_range hmc5843_writable_ranges[] = {
24 regmap_reg_range(0, HMC5843_MODE_REG),
25};
26
27static const struct regmap_access_table hmc5843_writable_table = {
28 .yes_ranges = hmc5843_writable_ranges,
29 .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
30};
31
32static const struct regmap_range hmc5843_volatile_ranges[] = {
33 regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
34};
35
36static const struct regmap_access_table hmc5843_volatile_table = {
37 .yes_ranges = hmc5843_volatile_ranges,
38 .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
39};
40
41static const struct regmap_config hmc5843_spi_regmap_config = {
42 .reg_bits = 8,
43 .val_bits = 8,
44
45 .rd_table = &hmc5843_readable_table,
46 .wr_table = &hmc5843_writable_table,
47 .volatile_table = &hmc5843_volatile_table,
48
49 /* Autoincrement address pointer */
50 .read_flag_mask = 0xc0,
51
52 .cache_type = REGCACHE_RBTREE,
53};
54
55static int hmc5843_spi_probe(struct spi_device *spi)
56{
57 int ret;
58 struct regmap *regmap;
59 const struct spi_device_id *id = spi_get_device_id(spi);
60
61 spi->mode = SPI_MODE_3;
62 spi->max_speed_hz = 8000000;
63 ret = spi_setup(spi);
64 if (ret)
65 return ret;
66
67 regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
68 if (IS_ERR(regmap))
69 return PTR_ERR(regmap);
70
71 return hmc5843_common_probe(&spi->dev,
72 regmap,
73 id->driver_data, id->name);
74}
75
76static void hmc5843_spi_remove(struct spi_device *spi)
77{
78 hmc5843_common_remove(&spi->dev);
79}
80
81static const struct spi_device_id hmc5843_id[] = {
82 { "hmc5983", HMC5983_ID },
83 { }
84};
85MODULE_DEVICE_TABLE(spi, hmc5843_id);
86
87static struct spi_driver hmc5843_driver = {
88 .driver = {
89 .name = "hmc5843",
90 .pm = pm_sleep_ptr(&hmc5843_pm_ops),
91 },
92 .id_table = hmc5843_id,
93 .probe = hmc5843_spi_probe,
94 .remove = hmc5843_spi_remove,
95};
96
97module_spi_driver(hmc5843_driver);
98
99MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
100MODULE_DESCRIPTION("HMC5983 SPI driver");
101MODULE_LICENSE("GPL");
102MODULE_IMPORT_NS("IIO_HMC5843");