1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver
  4 *
  5 * Copyright (c) Andreas Klinger <ak@it-klinger.de>
  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/i2c.h>
 14#include <linux/mod_devicetable.h>
 15#include <linux/module.h>
 16#include <linux/types.h>
 17
 18#include "mprls0025pa.h"
 19
 20static int mpr_i2c_init(struct device *unused)
 21{
 22	return 0;
 23}
 24
 25static int mpr_i2c_read(struct mpr_data *data, const u8 unused, const u8 cnt)
 26{
 27	int ret;
 28	struct i2c_client *client = to_i2c_client(data->dev);
 29
 30	if (cnt > MPR_MEASUREMENT_RD_SIZE)
 31		return -EOVERFLOW;
 32
 33	memset(data->buffer, 0, MPR_MEASUREMENT_RD_SIZE);
 34	ret = i2c_master_recv(client, data->buffer, cnt);
 35	if (ret < 0)
 36		return ret;
 37	else if (ret != cnt)
 38		return -EIO;
 39
 40	return 0;
 41}
 42
 43static int mpr_i2c_write(struct mpr_data *data, const u8 cmd, const u8 unused)
 44{
 45	int ret;
 46	struct i2c_client *client = to_i2c_client(data->dev);
 47	u8 wdata[MPR_PKT_SYNC_LEN];
 48
 49	memset(wdata, 0, sizeof(wdata));
 50	wdata[0] = cmd;
 51
 52	ret = i2c_master_send(client, wdata, MPR_PKT_SYNC_LEN);
 53	if (ret < 0)
 54		return ret;
 55	else if (ret != MPR_PKT_SYNC_LEN)
 56		return -EIO;
 57
 58	return 0;
 59}
 60
 61static const struct mpr_ops mpr_i2c_ops = {
 62	.init = mpr_i2c_init,
 63	.read = mpr_i2c_read,
 64	.write = mpr_i2c_write,
 65};
 66
 67static int mpr_i2c_probe(struct i2c_client *client)
 68{
 69	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BYTE))
 70		return -EOPNOTSUPP;
 71
 72	return mpr_common_probe(&client->dev, &mpr_i2c_ops, client->irq);
 73}
 74
 75static const struct of_device_id mpr_i2c_match[] = {
 76	{ .compatible = "honeywell,mprls0025pa" },
 77	{}
 78};
 79MODULE_DEVICE_TABLE(of, mpr_i2c_match);
 80
 81static const struct i2c_device_id mpr_i2c_id[] = {
 82	{ "mprls0025pa" },
 83	{}
 84};
 85MODULE_DEVICE_TABLE(i2c, mpr_i2c_id);
 86
 87static struct i2c_driver mpr_i2c_driver = {
 88	.probe = mpr_i2c_probe,
 89	.id_table = mpr_i2c_id,
 90	.driver = {
 91		.name = "mprls0025pa",
 92		.of_match_table = mpr_i2c_match,
 93	},
 94};
 95module_i2c_driver(mpr_i2c_driver);
 96
 97MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
 98MODULE_DESCRIPTION("Honeywell MPR pressure sensor i2c driver");
 99MODULE_LICENSE("GPL");
100MODULE_IMPORT_NS("IIO_HONEYWELL_MPRLS0025PA");