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/of_device.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 #if defined(CONFIG_OF)
70 static const struct of_device_id zpa2326_i2c_matches[] = {
71 	{ .compatible = "murata,zpa2326" },
72 	{ }
73 };
74 MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
75 #endif
76 
77 static struct i2c_driver zpa2326_i2c_driver = {
78 	.driver = {
79 		.name           = "zpa2326-i2c",
80 		.of_match_table = of_match_ptr(zpa2326_i2c_matches),
81 		.pm             = ZPA2326_PM_OPS,
82 	},
83 	.probe    = zpa2326_probe_i2c,
84 	.remove   = zpa2326_remove_i2c,
85 	.id_table = zpa2326_i2c_ids,
86 };
87 module_i2c_driver(zpa2326_i2c_driver);
88 
89 MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
90 MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
91 MODULE_LICENSE("GPL v2");
92