Quelle  hsc030pa_i2c.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Honeywell TruStability HSC Series pressure/temperature sensor
 *
 * Copyright (c) 2023 Petre Rodan <petre.rodan@subdimension.ro>
 *
 * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/common/documents/sps-siot-i2c-comms-digital-output-pressure-sensors-tn-008201-3-en-ciid-45841.pdf
 * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/common/documents/sps-siot-sleep-mode-technical-note-008286-1-en-ciid-155793.pdf
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/types.h>

#include <linux/iio/iio.h>

#include "hsc030pa.h"

static int hsc_i2c_recv(struct hsc_data *data)
{
 struct i2c_client *client = to_i2c_client(data->dev);
 struct i2c_msg msg;
 int ret;

 msleep_interruptible(HSC_RESP_TIME_MS);

 msg.addr = client->addr;
 msg.flags = client->flags | I2C_M_RD;
 msg.len = HSC_REG_MEASUREMENT_RD_SIZE;
 msg.buf = data->buffer;

 ret = i2c_transfer(client->adapter, &msg, 1);

 return (ret == 2) ? 0 : ret;
}

static int hsc_i2c_probe(struct i2c_client *client)
{
 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
  return -EOPNOTSUPP;

 return hsc_common_probe(&client->dev, hsc_i2c_recv);
}

static const struct of_device_id hsc_i2c_match[] = {
 { .compatible = "honeywell,hsc030pa" },
 { }
};
MODULE_DEVICE_TABLE(of, hsc_i2c_match);

static const struct i2c_device_id hsc_i2c_id[] = {
 { "hsc030pa" },
 { }
};
MODULE_DEVICE_TABLE(i2c, hsc_i2c_id);

static struct i2c_driver hsc_i2c_driver = {
 .driver = {
  .name = "hsc030pa",
  .of_match_table = hsc_i2c_match,
 },
 .probe = hsc_i2c_probe,
 .id_table = hsc_i2c_id,
};
module_i2c_driver(hsc_i2c_driver);

MODULE_AUTHOR("Petre Rodan ");
MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor i2c driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("IIO_HONEYWELL_HSC030PA");