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63cd31d320
Refactor driver by splitting the code into core and i2c. Seemingly redundant read/write function parameters are required for compatibility with the SPI driver. Co-developed-by: Andreas Klinger <ak@it-klinger.de> Signed-off-by: Andreas Klinger <ak@it-klinger.de> Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro> Link: https://lore.kernel.org/r/20231229092445.30180-9-petre.rodan@subdimension.ro Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver
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*
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* Copyright (c) Andreas Klinger <ak@it-klinger.de>
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*
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* Data sheet:
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* 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
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*/
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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 "mprls0025pa.h"
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static int mpr_i2c_init(struct device *unused)
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{
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return 0;
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}
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static int mpr_i2c_read(struct mpr_data *data, const u8 unused, const u8 cnt)
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{
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int ret;
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struct i2c_client *client = to_i2c_client(data->dev);
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if (cnt > MPR_MEASUREMENT_RD_SIZE)
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return -EOVERFLOW;
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memset(data->buffer, 0, MPR_MEASUREMENT_RD_SIZE);
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ret = i2c_master_recv(client, data->buffer, cnt);
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if (ret < 0)
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return ret;
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else if (ret != cnt)
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return -EIO;
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return 0;
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}
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static int mpr_i2c_write(struct mpr_data *data, const u8 cmd, const u8 unused)
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{
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int ret;
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struct i2c_client *client = to_i2c_client(data->dev);
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u8 wdata[MPR_PKT_SYNC_LEN];
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memset(wdata, 0, sizeof(wdata));
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wdata[0] = cmd;
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ret = i2c_master_send(client, wdata, MPR_PKT_SYNC_LEN);
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if (ret < 0)
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return ret;
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else if (ret != MPR_PKT_SYNC_LEN)
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return -EIO;
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return 0;
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}
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static const struct mpr_ops mpr_i2c_ops = {
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.init = mpr_i2c_init,
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.read = mpr_i2c_read,
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.write = mpr_i2c_write,
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};
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static int mpr_i2c_probe(struct i2c_client *client)
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{
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BYTE))
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return -EOPNOTSUPP;
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return mpr_common_probe(&client->dev, &mpr_i2c_ops, client->irq);
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}
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static const struct of_device_id mpr_i2c_match[] = {
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{ .compatible = "honeywell,mprls0025pa" },
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{}
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};
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MODULE_DEVICE_TABLE(of, mpr_i2c_match);
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static const struct i2c_device_id mpr_i2c_id[] = {
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{ "mprls0025pa" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mpr_i2c_id);
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static struct i2c_driver mpr_i2c_driver = {
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.probe = mpr_i2c_probe,
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.id_table = mpr_i2c_id,
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.driver = {
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.name = "mprls0025pa",
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.of_match_table = mpr_i2c_match,
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},
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};
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module_i2c_driver(mpr_i2c_driver);
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MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
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MODULE_DESCRIPTION("Honeywell MPR pressure sensor i2c driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(IIO_HONEYWELL_MPRLS0025PA);
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