// SPDX-License-Identifier: GPL-2.0-only /* * MPRLS0025PA - Honeywell MicroPressure MPR series SPI sensor driver * * Copyright (c) 2024 Petre Rodan <petre.rodan@subdimension.ro> * * Data sheet: * 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 */ #include <linux/array_size.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/stddef.h> #include <linux/types.h> #include "mprls0025pa.h" static int mpr_spi_xfer(struct mpr_data *data, const u8 cmd, const u8 pkt_len) { struct spi_device *spi = to_spi_device(data->dev); struct spi_transfer xfers[2] = { }; if (pkt_len > MPR_MEASUREMENT_RD_SIZE) return -EOVERFLOW; data->tx_buf[0] = cmd; /* * Dummy transfer with no data, just cause a 2.5us+ delay between the CS assert * and the first clock edge as per the datasheet tHDSS timing requirement. */ xfers[0].delay.value = 2500; xfers[0].delay.unit = SPI_DELAY_UNIT_NSECS; xfers[1].tx_buf = data->tx_buf; xfers[1].rx_buf = data->rx_buf; xfers[1].len = pkt_len; return spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers)); } static const struct mpr_ops mpr_spi_ops = { .read = mpr_spi_xfer, .write = mpr_spi_xfer, }; static int mpr_spi_probe(struct spi_device *spi) { return mpr_common_probe(&spi->dev, &mpr_spi_ops, spi->irq); } static const struct of_device_id mpr_spi_match[] = { { .compatible = "honeywell,mprls0025pa" }, { } }; MODULE_DEVICE_TABLE(of, mpr_spi_match); static const struct spi_device_id mpr_spi_id[] = { { "mprls0025pa" }, { } }; MODULE_DEVICE_TABLE(spi, mpr_spi_id); static struct spi_driver mpr_spi_driver = { .driver = { .name = "mprls0025pa", .of_match_table = mpr_spi_match, }, .probe = mpr_spi_probe, .id_table = mpr_spi_id, }; module_spi_driver(mpr_spi_driver); MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>"); MODULE_DESCRIPTION("Honeywell MPR pressure sensor spi driver"); MODULE_LICENSE("GPL"); MODULE_IMPORT_NS("IIO_HONEYWELL_MPRLS0025PA");