1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Murata ZPA2326 I2C pressure and temperature sensor driver
4 *
5 * Copyright (c) 2016 Parrot S.A.
6 *
7 * Author: Gregor Boirie <gregor.boirie@parrot.com>
8 */
9
10#include <linux/module.h>
11#include <linux/regmap.h>
12#include <linux/i2c.h>
13#include <linux/mod_devicetable.h>
14#include "zpa2326.h"
15
16/*
17 * read_flag_mask:
18 *   - address bit 7 must be set to request a register read operation
19 */
20static const struct regmap_config zpa2326_regmap_i2c_config = {
21	.reg_bits       = 8,
22	.val_bits       = 8,
23	.writeable_reg  = zpa2326_isreg_writeable,
24	.readable_reg   = zpa2326_isreg_readable,
25	.precious_reg   = zpa2326_isreg_precious,
26	.max_register   = ZPA2326_TEMP_OUT_H_REG,
27	.read_flag_mask = BIT(7),
28	.cache_type     = REGCACHE_NONE,
29};
30
31static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
32{
33#define ZPA2326_SA0(_addr)          (_addr & BIT(0))
34#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)
35
36	/* Identification register bit 1 mirrors device address bit 0. */
37	return (ZPA2326_DEVICE_ID |
38		(ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
39}
40
41static int zpa2326_probe_i2c(struct i2c_client          *client)
42{
43	const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client);
44	struct regmap *regmap;
45
46	regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
47	if (IS_ERR(regmap)) {
48		dev_err(&client->dev, "failed to init registers map");
49		return PTR_ERR(regmap);
50	}
51
52	return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
53			     zpa2326_i2c_hwid(client), regmap);
54}
55
56static void zpa2326_remove_i2c(struct i2c_client *client)
57{
58	zpa2326_remove(&client->dev);
59}
60
61static const struct i2c_device_id zpa2326_i2c_ids[] = {
62	{ "zpa2326", 0 },
63	{ },
64};
65MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
66
67static const struct of_device_id zpa2326_i2c_matches[] = {
68	{ .compatible = "murata,zpa2326" },
69	{ }
70};
71MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
72
73static struct i2c_driver zpa2326_i2c_driver = {
74	.driver = {
75		.name           = "zpa2326-i2c",
76		.of_match_table = zpa2326_i2c_matches,
77		.pm             = ZPA2326_PM_OPS,
78	},
79	.probe = zpa2326_probe_i2c,
80	.remove   = zpa2326_remove_i2c,
81	.id_table = zpa2326_i2c_ids,
82};
83module_i2c_driver(zpa2326_i2c_driver);
84
85MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
86MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
87MODULE_LICENSE("GPL v2");
88MODULE_IMPORT_NS(IIO_ZPA2326);
89