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/of_device.h>
13 
14 static const struct iio_info iio_sd_mod_iio_info;
15 
16 static const struct iio_chan_spec iio_sd_mod_ch = {
17 	.type = IIO_VOLTAGE,
18 	.indexed = 1,
19 	.scan_type = {
20 		.sign = 'u',
21 		.realbits = 1,
22 		.shift = 0,
23 	},
24 };
25 
26 static int iio_sd_mod_probe(struct platform_device *pdev)
27 {
28 	struct device *dev = &pdev->dev;
29 	struct iio_dev *iio;
30 
31 	iio = devm_iio_device_alloc(dev, 0);
32 	if (!iio)
33 		return -ENOMEM;
34 
35 	iio->dev.parent = dev;
36 	iio->dev.of_node = dev->of_node;
37 	iio->name = dev_name(dev);
38 	iio->info = &iio_sd_mod_iio_info;
39 	iio->modes = INDIO_BUFFER_HARDWARE;
40 
41 	iio->num_channels = 1;
42 	iio->channels = &iio_sd_mod_ch;
43 
44 	platform_set_drvdata(pdev, iio);
45 
46 	return devm_iio_device_register(&pdev->dev, iio);
47 }
48 
49 static const struct of_device_id sd_adc_of_match[] = {
50 	{ .compatible = "sd-modulator" },
51 	{ .compatible = "ads1201" },
52 	{ }
53 };
54 MODULE_DEVICE_TABLE(of, sd_adc_of_match);
55 
56 static struct platform_driver iio_sd_mod_adc = {
57 	.driver = {
58 		.name = "iio_sd_adc_mod",
59 		.of_match_table = of_match_ptr(sd_adc_of_match),
60 	},
61 	.probe = iio_sd_mod_probe,
62 };
63 
64 module_platform_driver(iio_sd_mod_adc);
65 
66 MODULE_DESCRIPTION("Basic sigma delta modulator");
67 MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
68 MODULE_LICENSE("GPL v2");
69