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