drivers/iio/pressure/mprls0025pa_i2c.c

   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
  20 static int mpr_i2c_init(struct device *unused)
  21 {
  22         return 0;
  23 }
  24
  25 static 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
  43 static 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
  61 static const struct mpr_ops mpr_i2c_ops = {
  62         .init = mpr_i2c_init,
  63         .read = mpr_i2c_read,
  64         .write = mpr_i2c_write,
  65 };
  66
  67 static 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
  75 static const struct of_device_id mpr_i2c_match[] = {
  76         { .compatible = "honeywell,mprls0025pa" },
  77         {}
  78 };
  79 MODULE_DEVICE_TABLE(of, mpr_i2c_match);
  80
  81 static const struct i2c_device_id mpr_i2c_id[] = {
  82         { "mprls0025pa" },
  83         {}
  84 };
  85 MODULE_DEVICE_TABLE(i2c, mpr_i2c_id);
  86
  87 static 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 };
  95 module_i2c_driver(mpr_i2c_driver);
  96
  97 MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
  98 MODULE_DESCRIPTION("Honeywell MPR pressure sensor i2c driver");
  99 MODULE_LICENSE("GPL");
 100 MODULE_IMPORT_NS("IIO_HONEYWELL_MPRLS0025PA");