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
zpa2326_i2c_hwid(const struct i2c_client * client)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
zpa2326_probe_i2c(struct i2c_client * client,const struct i2c_device_id * i2c_id)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
zpa2326_remove_i2c(struct i2c_client * client)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");
90