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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * MPRLS0025PA - Honeywell MicroPressure pressure sensor series driver4 *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.pdf9 */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);101