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// 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/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[] = {
{ .name = "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");
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