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 | */ |
20 | static 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 | |
31 | static 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 | |
41 | static 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(ptr: regmap)) { |
48 | dev_err(&client->dev, "failed to init registers map" ); |
49 | return PTR_ERR(ptr: regmap); |
50 | } |
51 | |
52 | return zpa2326_probe(parent: &client->dev, name: i2c_id->name, irq: client->irq, |
53 | hwid: zpa2326_i2c_hwid(client), regmap); |
54 | } |
55 | |
56 | static void zpa2326_remove_i2c(struct i2c_client *client) |
57 | { |
58 | zpa2326_remove(parent: &client->dev); |
59 | } |
60 | |
61 | static const struct i2c_device_id zpa2326_i2c_ids[] = { |
62 | { "zpa2326" , 0 }, |
63 | { }, |
64 | }; |
65 | MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); |
66 | |
67 | static const struct of_device_id zpa2326_i2c_matches[] = { |
68 | { .compatible = "murata,zpa2326" }, |
69 | { } |
70 | }; |
71 | MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); |
72 | |
73 | static 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 | }; |
83 | module_i2c_driver(zpa2326_i2c_driver); |
84 | |
85 | MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>" ); |
86 | MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor" ); |
87 | MODULE_LICENSE("GPL v2" ); |
88 | MODULE_IMPORT_NS(IIO_ZPA2326); |
89 | |