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 | |
21 | struct mpr_spi_buf { |
22 | u8 tx[MPR_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN); |
23 | }; |
24 | |
25 | static 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, size: sizeof(*buf), GFP_KERNEL); |
31 | if (!buf) |
32 | return -ENOMEM; |
33 | |
34 | spi_set_drvdata(spi, data: buf); |
35 | |
36 | return 0; |
37 | } |
38 | |
39 | static int mpr_spi_xfer(struct mpr_data *data, const u8 cmd, const u8 pkt_len) |
40 | { |
41 | struct spi_device *spi = to_spi_device(dev: 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, xfers: &xfer, num_xfers: 1); |
54 | } |
55 | |
56 | static const struct mpr_ops mpr_spi_ops = { |
57 | .init = mpr_spi_init, |
58 | .read = mpr_spi_xfer, |
59 | .write = mpr_spi_xfer, |
60 | }; |
61 | |
62 | static int mpr_spi_probe(struct spi_device *spi) |
63 | { |
64 | return mpr_common_probe(dev: &spi->dev, ops: &mpr_spi_ops, irq: spi->irq); |
65 | } |
66 | |
67 | static const struct of_device_id mpr_spi_match[] = { |
68 | { .compatible = "honeywell,mprls0025pa" }, |
69 | {} |
70 | }; |
71 | MODULE_DEVICE_TABLE(of, mpr_spi_match); |
72 | |
73 | static const struct spi_device_id mpr_spi_id[] = { |
74 | { "mprls0025pa" }, |
75 | {} |
76 | }; |
77 | MODULE_DEVICE_TABLE(spi, mpr_spi_id); |
78 | |
79 | static 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 | }; |
87 | module_spi_driver(mpr_spi_driver); |
88 | |
89 | MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>" ); |
90 | MODULE_DESCRIPTION("Honeywell MPR pressure sensor spi driver" ); |
91 | MODULE_LICENSE("GPL" ); |
92 | MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA); |
93 | |