drivers/iio/adc/sd_adc_modulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic sigma delta modulator driver
   4  *
   5  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   6  * Author: Arnaud Pouliquen <arnaud.pouliquen@st.com>.
   7  */
   8
   9 #include <linux/iio/iio.h>
  10 #include <linux/iio/triggered_buffer.h>
  11 #include <linux/module.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/platform_device.h>
  14
  15 static const struct iio_info iio_sd_mod_iio_info;
  16
  17 static const struct iio_chan_spec iio_sd_mod_ch = {
  18         .type = IIO_VOLTAGE,
  19         .indexed = 1,
  20         .scan_type = {
  21                 .sign = 'u',
  22                 .realbits = 1,
  23                 .shift = 0,
  24         },
  25 };
  26
  27 static int iio_sd_mod_probe(struct platform_device *pdev)
  28 {
  29         struct device *dev = &pdev->dev;
  30         struct iio_dev *iio;
  31
  32         iio = devm_iio_device_alloc(dev, 0);
  33         if (!iio)
  34                 return -ENOMEM;
  35
  36         iio->name = dev_name(dev);
  37         iio->info = &iio_sd_mod_iio_info;
  38         iio->modes = INDIO_BUFFER_HARDWARE;
  39
  40         iio->num_channels = 1;
  41         iio->channels = &iio_sd_mod_ch;
  42
  43         platform_set_drvdata(pdev, iio);
  44
  45         return devm_iio_device_register(&pdev->dev, iio);
  46 }
  47
  48 static const struct of_device_id sd_adc_of_match[] = {
  49         { .compatible = "sd-modulator" },
  50         { .compatible = "ads1201" },
  51         { }
  52 };
  53 MODULE_DEVICE_TABLE(of, sd_adc_of_match);
  54
  55 static struct platform_driver iio_sd_mod_adc = {
  56         .driver = {
  57                 .name = "iio_sd_adc_mod",
  58                 .of_match_table = sd_adc_of_match,
  59         },
  60         .probe = iio_sd_mod_probe,
  61 };
  62
  63 module_platform_driver(iio_sd_mod_adc);
  64
  65 MODULE_DESCRIPTION("Basic sigma delta modulator");
  66 MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
  67 MODULE_LICENSE("GPL v2");