drivers/iio/adc/ad7606_par.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AD7606 Parallel Interface ADC driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  */
   7
   8 #include <linux/mod_devicetable.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/types.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14
  15 #include <linux/iio/iio.h>
  16 #include "ad7606.h"
  17
  18 static int ad7606_par16_read_block(struct device *dev,
  19                                    int count, void *buf)
  20 {
  21         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  22         struct ad7606_state *st = iio_priv(indio_dev);
  23
  24         insw((unsigned long)st->base_address, buf, count);
  25
  26         return 0;
  27 }
  28
  29 static const struct ad7606_bus_ops ad7606_par16_bops = {
  30         .read_block = ad7606_par16_read_block,
  31 };
  32
  33 static int ad7606_par8_read_block(struct device *dev,
  34                                   int count, void *buf)
  35 {
  36         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  37         struct ad7606_state *st = iio_priv(indio_dev);
  38
  39         insb((unsigned long)st->base_address, buf, count * 2);
  40
  41         return 0;
  42 }
  43
  44 static const struct ad7606_bus_ops ad7606_par8_bops = {
  45         .read_block = ad7606_par8_read_block,
  46 };
  47
  48 static int ad7606_par_probe(struct platform_device *pdev)
  49 {
  50         const struct platform_device_id *id = platform_get_device_id(pdev);
  51         struct resource *res;
  52         void __iomem *addr;
  53         resource_size_t remap_size;
  54         int irq;
  55
  56         irq = platform_get_irq(pdev, 0);
  57         if (irq < 0)
  58                 return irq;
  59
  60         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  61         addr = devm_ioremap_resource(&pdev->dev, res);
  62         if (IS_ERR(addr))
  63                 return PTR_ERR(addr);
  64
  65         remap_size = resource_size(res);
  66
  67         return ad7606_probe(&pdev->dev, irq, addr,
  68                             id->name, id->driver_data,
  69                             remap_size > 1 ? &ad7606_par16_bops :
  70                             &ad7606_par8_bops);
  71 }
  72
  73 static const struct platform_device_id ad7606_driver_ids[] = {
  74         { .name = "ad7605-4", .driver_data = ID_AD7605_4, },
  75         { .name = "ad7606-4", .driver_data = ID_AD7606_4, },
  76         { .name = "ad7606-6", .driver_data = ID_AD7606_6, },
  77         { .name = "ad7606-8", .driver_data = ID_AD7606_8, },
  78         { }
  79 };
  80 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
  81
  82 static const struct of_device_id ad7606_of_match[] = {
  83         { .compatible = "adi,ad7605-4" },
  84         { .compatible = "adi,ad7606-4" },
  85         { .compatible = "adi,ad7606-6" },
  86         { .compatible = "adi,ad7606-8" },
  87         { },
  88 };
  89 MODULE_DEVICE_TABLE(of, ad7606_of_match);
  90
  91 static struct platform_driver ad7606_driver = {
  92         .probe = ad7606_par_probe,
  93         .id_table = ad7606_driver_ids,
  94         .driver = {
  95                 .name = "ad7606",
  96                 .pm = AD7606_PM_OPS,
  97                 .of_match_table = ad7606_of_match,
  98         },
  99 };
 100 module_platform_driver(ad7606_driver);
 101
 102 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 103 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 104 MODULE_LICENSE("GPL v2");
 105 MODULE_IMPORT_NS(IIO_AD7606);