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");
68