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Add a mandatory 2ms delay between consecutive chip reads. A Technical Note pdf specifies that the measurement cycle in these chips takes around 1.26ms. By adding this 2ms delay we make sure that we never get stale measurements. For more details, please see "Figure 1" in the pdf below: 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 Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro> Link: https://lore.kernel.org/r/20240211075645.28777-6-petre.rodan@subdimension.ro Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Honeywell TruStability HSC Series pressure/temperature sensor
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*
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* Copyright (c) 2023 Petre Rodan <petre.rodan@subdimension.ro>
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*
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* 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
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* 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
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/iio/iio.h>
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#include "hsc030pa.h"
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static int hsc_i2c_recv(struct hsc_data *data)
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{
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struct i2c_client *client = to_i2c_client(data->dev);
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struct i2c_msg msg;
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int ret;
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msleep_interruptible(HSC_RESP_TIME_MS);
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msg.addr = client->addr;
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msg.flags = client->flags | I2C_M_RD;
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msg.len = HSC_REG_MEASUREMENT_RD_SIZE;
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msg.buf = data->buffer;
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ret = i2c_transfer(client->adapter, &msg, 1);
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return (ret == 2) ? 0 : ret;
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}
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static int hsc_i2c_probe(struct i2c_client *client)
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{
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return -EOPNOTSUPP;
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return hsc_common_probe(&client->dev, hsc_i2c_recv);
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}
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static const struct of_device_id hsc_i2c_match[] = {
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{ .compatible = "honeywell,hsc030pa" },
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{}
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};
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MODULE_DEVICE_TABLE(of, hsc_i2c_match);
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static const struct i2c_device_id hsc_i2c_id[] = {
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{ "hsc030pa" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, hsc_i2c_id);
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static struct i2c_driver hsc_i2c_driver = {
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.driver = {
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.name = "hsc030pa",
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.of_match_table = hsc_i2c_match,
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},
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.probe = hsc_i2c_probe,
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.id_table = hsc_i2c_id,
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};
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module_i2c_driver(hsc_i2c_driver);
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MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>");
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MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor i2c driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(IIO_HONEYWELL_HSC030PA);
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