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
zpa2326_i2c_hwid(const struct i2c_client * client)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
zpa2326_probe_i2c(struct i2c_client * client,const struct i2c_device_id * i2c_id)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
zpa2326_remove_i2c(struct i2c_client * client)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");
100
