1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MPRLS0025PA - Honeywell MicroPressure MPR series SPI sensor driver
4 *
5 * Copyright (c) 2024 Petre Rodan <petre.rodan@subdimension.ro>
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/mod_devicetable.h>
14#include <linux/module.h>
15#include <linux/spi/spi.h>
16#include <linux/stddef.h>
17#include <linux/types.h>
18
19#include "mprls0025pa.h"
20
21struct mpr_spi_buf {
22	u8 tx[MPR_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
23};
24
25static int mpr_spi_init(struct device *dev)
26{
27	struct spi_device *spi = to_spi_device(dev);
28	struct mpr_spi_buf *buf;
29
30	buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL);
31	if (!buf)
32		return -ENOMEM;
33
34	spi_set_drvdata(spi, buf);
35
36	return 0;
37}
38
39static int mpr_spi_xfer(struct mpr_data *data, const u8 cmd, const u8 pkt_len)
40{
41	struct spi_device *spi = to_spi_device(data->dev);
42	struct mpr_spi_buf *buf = spi_get_drvdata(spi);
43	struct spi_transfer xfer;
44
45	if (pkt_len > MPR_MEASUREMENT_RD_SIZE)
46		return -EOVERFLOW;
47
48	buf->tx[0] = cmd;
49	xfer.tx_buf = buf->tx;
50	xfer.rx_buf = data->buffer;
51	xfer.len = pkt_len;
52
53	return spi_sync_transfer(spi, &xfer, 1);
54}
55
56static const struct mpr_ops mpr_spi_ops = {
57	.init = mpr_spi_init,
58	.read = mpr_spi_xfer,
59	.write = mpr_spi_xfer,
60};
61
62static int mpr_spi_probe(struct spi_device *spi)
63{
64	return mpr_common_probe(&spi->dev, &mpr_spi_ops, spi->irq);
65}
66
67static const struct of_device_id mpr_spi_match[] = {
68	{ .compatible = "honeywell,mprls0025pa" },
69	{}
70};
71MODULE_DEVICE_TABLE(of, mpr_spi_match);
72
73static const struct spi_device_id mpr_spi_id[] = {
74	{ "mprls0025pa" },
75	{}
76};
77MODULE_DEVICE_TABLE(spi, mpr_spi_id);
78
79static struct spi_driver mpr_spi_driver = {
80	.driver = {
81		.name = "mprls0025pa",
82		.of_match_table = mpr_spi_match,
83	},
84	.probe = mpr_spi_probe,
85	.id_table = mpr_spi_id,
86};
87module_spi_driver(mpr_spi_driver);
88
89MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>");
90MODULE_DESCRIPTION("Honeywell MPR pressure sensor spi driver");
91MODULE_LICENSE("GPL");
92MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA);
93