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1 | /* |
2 | * Murata ZPA2326 I2C pressure and temperature sensor driver | |
3 | * | |
4 | * Copyright (c) 2016 Parrot S.A. | |
5 | * | |
6 | * Author: Gregor Boirie <gregor.boirie@parrot.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/regmap.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/of_device.h> | |
22 | #include "zpa2326.h" | |
23 | ||
24 | /* | |
25 | * read_flag_mask: | |
26 | * - address bit 7 must be set to request a register read operation | |
27 | */ | |
28 | static const struct regmap_config zpa2326_regmap_i2c_config = { | |
29 | .reg_bits = 8, | |
30 | .val_bits = 8, | |
31 | .writeable_reg = zpa2326_isreg_writeable, | |
32 | .readable_reg = zpa2326_isreg_readable, | |
33 | .precious_reg = zpa2326_isreg_precious, | |
34 | .max_register = ZPA2326_TEMP_OUT_H_REG, | |
35 | .read_flag_mask = BIT(7), | |
36 | .cache_type = REGCACHE_NONE, | |
37 | }; | |
38 | ||
39 | static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) | |
40 | { | |
41 | #define ZPA2326_SA0(_addr) (_addr & BIT(0)) | |
42 | #define ZPA2326_DEVICE_ID_SA0_SHIFT (1) | |
43 | ||
44 | /* Identification register bit 1 mirrors device address bit 0. */ | |
45 | return (ZPA2326_DEVICE_ID | | |
46 | (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); | |
47 | } | |
48 | ||
49 | static int zpa2326_probe_i2c(struct i2c_client *client, | |
50 | const struct i2c_device_id *i2c_id) | |
51 | { | |
52 | struct regmap *regmap; | |
53 | ||
54 | regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); | |
55 | if (IS_ERR(regmap)) { | |
56 | dev_err(&client->dev, "failed to init registers map"); | |
57 | return PTR_ERR(regmap); | |
58 | } | |
59 | ||
60 | return zpa2326_probe(&client->dev, i2c_id->name, client->irq, | |
61 | zpa2326_i2c_hwid(client), regmap); | |
62 | } | |
63 | ||
64 | static int zpa2326_remove_i2c(struct i2c_client *client) | |
65 | { | |
66 | zpa2326_remove(&client->dev); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | static const struct i2c_device_id zpa2326_i2c_ids[] = { | |
72 | { "zpa2326", 0 }, | |
73 | { }, | |
74 | }; | |
75 | MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); | |
76 | ||
77 | #if defined(CONFIG_OF) | |
78 | static const struct of_device_id zpa2326_i2c_matches[] = { | |
79 | { .compatible = "murata,zpa2326" }, | |
80 | { } | |
81 | }; | |
82 | MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); | |
83 | #endif | |
84 | ||
85 | static struct i2c_driver zpa2326_i2c_driver = { | |
86 | .driver = { | |
87 | .name = "zpa2326-i2c", | |
88 | .of_match_table = of_match_ptr(zpa2326_i2c_matches), | |
89 | .pm = ZPA2326_PM_OPS, | |
90 | }, | |
91 | .probe = zpa2326_probe_i2c, | |
92 | .remove = zpa2326_remove_i2c, | |
93 | .id_table = zpa2326_i2c_ids, | |
94 | }; | |
95 | module_i2c_driver(zpa2326_i2c_driver); | |
96 | ||
97 | MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); | |
98 | MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); | |
99 | MODULE_LICENSE("GPL v2"); |