GNU Linux-libre 5.15.72-gnu
[releases.git] / drivers / iio / pressure / zpa2326_i2c.c
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                              const struct i2c_device_id *i2c_id)
43 {
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
56 static int zpa2326_remove_i2c(struct i2c_client *client)
57 {
58         zpa2326_remove(&client->dev);
59
60         return 0;
61 }
62
63 static const struct i2c_device_id zpa2326_i2c_ids[] = {
64         { "zpa2326", 0 },
65         { },
66 };
67 MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
68
69 static const struct of_device_id zpa2326_i2c_matches[] = {
70         { .compatible = "murata,zpa2326" },
71         { }
72 };
73 MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
74
75 static struct i2c_driver zpa2326_i2c_driver = {
76         .driver = {
77                 .name           = "zpa2326-i2c",
78                 .of_match_table = zpa2326_i2c_matches,
79                 .pm             = ZPA2326_PM_OPS,
80         },
81         .probe    = zpa2326_probe_i2c,
82         .remove   = zpa2326_remove_i2c,
83         .id_table = zpa2326_i2c_ids,
84 };
85 module_i2c_driver(zpa2326_i2c_driver);
86
87 MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
88 MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
89 MODULE_LICENSE("GPL v2");