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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * MPRLS0025PA - Honeywell MicroPressure MPR series SPI sensor driver4 *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.pdf9 */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