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, data->buffer, 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, 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(client->adapter, I2C_FUNC_SMBUS_READ_BYTE))
70		return -EOPNOTSUPP;
71
72	return mpr_common_probe(&client->dev, &mpr_i2c_ops, 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