1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver
4 *
5 * Copyright (c) Andreas Klinger <ak@it-klinger.de>
6 *
7 * Data sheet:
8 * https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/micropressure-mpr-series/documents/sps-siot-mpr-series-datasheet-32332628-ciid-172626.pdf
9 */
10
11#include <linux/device.h>
12#include <linux/errno.h>
13#include <linux/i2c.h>
14#include <linux/mod_devicetable.h>
15#include <linux/module.h>
16#include <linux/types.h>
17
18#include "mprls0025pa.h"
19
20static int mpr_i2c_init(struct device *unused)
21{
22 return 0;
23}
24
25static int mpr_i2c_read(struct mpr_data *data, const u8 unused, const u8 cnt)
26{
27 int ret;
28 struct i2c_client *client = to_i2c_client(data->dev);
29
30 if (cnt > MPR_MEASUREMENT_RD_SIZE)
31 return -EOVERFLOW;
32
33 memset(data->buffer, 0, MPR_MEASUREMENT_RD_SIZE);
34 ret = i2c_master_recv(client, buf: data->buffer, count: cnt);
35 if (ret < 0)
36 return ret;
37 else if (ret != cnt)
38 return -EIO;
39
40 return 0;
41}
42
43static int mpr_i2c_write(struct mpr_data *data, const u8 cmd, const u8 unused)
44{
45 int ret;
46 struct i2c_client *client = to_i2c_client(data->dev);
47 u8 wdata[MPR_PKT_SYNC_LEN];
48
49 memset(wdata, 0, sizeof(wdata));
50 wdata[0] = cmd;
51
52 ret = i2c_master_send(client, buf: wdata, MPR_PKT_SYNC_LEN);
53 if (ret < 0)
54 return ret;
55 else if (ret != MPR_PKT_SYNC_LEN)
56 return -EIO;
57
58 return 0;
59}
60
61static const struct mpr_ops mpr_i2c_ops = {
62 .init = mpr_i2c_init,
63 .read = mpr_i2c_read,
64 .write = mpr_i2c_write,
65};
66
67static int mpr_i2c_probe(struct i2c_client *client)
68{
69 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_READ_BYTE))
70 return -EOPNOTSUPP;
71
72 return mpr_common_probe(dev: &client->dev, ops: &mpr_i2c_ops, irq: client->irq);
73}
74
75static const struct of_device_id mpr_i2c_match[] = {
76 { .compatible = "honeywell,mprls0025pa" },
77 {}
78};
79MODULE_DEVICE_TABLE(of, mpr_i2c_match);
80
81static const struct i2c_device_id mpr_i2c_id[] = {
82 { "mprls0025pa" },
83 {}
84};
85MODULE_DEVICE_TABLE(i2c, mpr_i2c_id);
86
87static struct i2c_driver mpr_i2c_driver = {
88 .probe = mpr_i2c_probe,
89 .id_table = mpr_i2c_id,
90 .driver = {
91 .name = "mprls0025pa",
92 .of_match_table = mpr_i2c_match,
93 },
94};
95module_i2c_driver(mpr_i2c_driver);
96
97MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
98MODULE_DESCRIPTION("Honeywell MPR pressure sensor i2c driver");
99MODULE_LICENSE("GPL");
100MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA);
101

source code of linux/drivers/iio/pressure/mprls0025pa_i2c.c