1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Murata ZPA2326 I2C pressure and temperature sensor driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2016 Parrot S.A.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Gregor Boirie <gregor.boirie@parrot.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/regmap.h>
12*4882a593Smuzhiyun #include <linux/i2c.h>
13*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
14*4882a593Smuzhiyun #include "zpa2326.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /*
17*4882a593Smuzhiyun * read_flag_mask:
18*4882a593Smuzhiyun * - address bit 7 must be set to request a register read operation
19*4882a593Smuzhiyun */
20*4882a593Smuzhiyun static const struct regmap_config zpa2326_regmap_i2c_config = {
21*4882a593Smuzhiyun .reg_bits = 8,
22*4882a593Smuzhiyun .val_bits = 8,
23*4882a593Smuzhiyun .writeable_reg = zpa2326_isreg_writeable,
24*4882a593Smuzhiyun .readable_reg = zpa2326_isreg_readable,
25*4882a593Smuzhiyun .precious_reg = zpa2326_isreg_precious,
26*4882a593Smuzhiyun .max_register = ZPA2326_TEMP_OUT_H_REG,
27*4882a593Smuzhiyun .read_flag_mask = BIT(7),
28*4882a593Smuzhiyun .cache_type = REGCACHE_NONE,
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
zpa2326_i2c_hwid(const struct i2c_client * client)31*4882a593Smuzhiyun static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun #define ZPA2326_SA0(_addr) (_addr & BIT(0))
34*4882a593Smuzhiyun #define ZPA2326_DEVICE_ID_SA0_SHIFT (1)
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /* Identification register bit 1 mirrors device address bit 0. */
37*4882a593Smuzhiyun return (ZPA2326_DEVICE_ID |
38*4882a593Smuzhiyun (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
zpa2326_probe_i2c(struct i2c_client * client,const struct i2c_device_id * i2c_id)41*4882a593Smuzhiyun static int zpa2326_probe_i2c(struct i2c_client *client,
42*4882a593Smuzhiyun const struct i2c_device_id *i2c_id)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun struct regmap *regmap;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
47*4882a593Smuzhiyun if (IS_ERR(regmap)) {
48*4882a593Smuzhiyun dev_err(&client->dev, "failed to init registers map");
49*4882a593Smuzhiyun return PTR_ERR(regmap);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
53*4882a593Smuzhiyun zpa2326_i2c_hwid(client), regmap);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
zpa2326_remove_i2c(struct i2c_client * client)56*4882a593Smuzhiyun static int zpa2326_remove_i2c(struct i2c_client *client)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun zpa2326_remove(&client->dev);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun static const struct i2c_device_id zpa2326_i2c_ids[] = {
64*4882a593Smuzhiyun { "zpa2326", 0 },
65*4882a593Smuzhiyun { },
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun static const struct of_device_id zpa2326_i2c_matches[] = {
70*4882a593Smuzhiyun { .compatible = "murata,zpa2326" },
71*4882a593Smuzhiyun { }
72*4882a593Smuzhiyun };
73*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct i2c_driver zpa2326_i2c_driver = {
76*4882a593Smuzhiyun .driver = {
77*4882a593Smuzhiyun .name = "zpa2326-i2c",
78*4882a593Smuzhiyun .of_match_table = zpa2326_i2c_matches,
79*4882a593Smuzhiyun .pm = ZPA2326_PM_OPS,
80*4882a593Smuzhiyun },
81*4882a593Smuzhiyun .probe = zpa2326_probe_i2c,
82*4882a593Smuzhiyun .remove = zpa2326_remove_i2c,
83*4882a593Smuzhiyun .id_table = zpa2326_i2c_ids,
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun module_i2c_driver(zpa2326_i2c_driver);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
88*4882a593Smuzhiyun MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
89*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
90