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/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/types.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13
  14 #include <linux/iio/iio.h>
  15 #include "ad7606.h"
  16
  17 static int ad7606_par16_read_block(struct device *dev,
  18                                    int count, void *buf)
  19 {
  20         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  21         struct ad7606_state *st = iio_priv(indio_dev);
  22
  23         insw((unsigned long)st->base_address, buf, count);
  24
  25         return 0;
  26 }
  27
  28 static const struct ad7606_bus_ops ad7606_par16_bops = {
  29         .read_block = ad7606_par16_read_block,
  30 };
  31
  32 static int ad7606_par8_read_block(struct device *dev,
  33                                   int count, void *buf)
  34 {
  35         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  36         struct ad7606_state *st = iio_priv(indio_dev);
  37
  38         insb((unsigned long)st->base_address, buf, count * 2);
  39
  40         return 0;
  41 }
  42
  43 static const struct ad7606_bus_ops ad7606_par8_bops = {
  44         .read_block = ad7606_par8_read_block,
  45 };
  46
  47 static int ad7606_par_probe(struct platform_device *pdev)
  48 {
  49         const struct platform_device_id *id = platform_get_device_id(pdev);
  50         struct resource *res;
  51         void __iomem *addr;
  52         resource_size_t remap_size;
  53         int irq;
  54
  55         irq = platform_get_irq(pdev, 0);
  56         if (irq < 0) {
  57                 dev_err(&pdev->dev, "no irq: %d\n", irq);
  58                 return irq;
  59         }
  60
  61         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  62         addr = devm_ioremap_resource(&pdev->dev, res);
  63         if (IS_ERR(addr))
  64                 return PTR_ERR(addr);
  65
  66         remap_size = resource_size(res);
  67
  68         return ad7606_probe(&pdev->dev, irq, addr,
  69                             id->name, id->driver_data,
  70                             remap_size > 1 ? &ad7606_par16_bops :
  71                             &ad7606_par8_bops);
  72 }
  73
  74 static const struct platform_device_id ad7606_driver_ids[] = {
  75         { .name = "ad7605-4", .driver_data = ID_AD7605_4, },
  76         { .name = "ad7606-4", .driver_data = ID_AD7606_4, },
  77         { .name = "ad7606-6", .driver_data = ID_AD7606_6, },
  78         { .name = "ad7606-8", .driver_data = ID_AD7606_8, },
  79         { }
  80 };
  81 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
  82
  83 static const struct of_device_id ad7606_of_match[] = {
  84         { .compatible = "adi,ad7605-4" },
  85         { .compatible = "adi,ad7606-4" },
  86         { .compatible = "adi,ad7606-6" },
  87         { .compatible = "adi,ad7606-8" },
  88         { },
  89 };
  90 MODULE_DEVICE_TABLE(of, ad7606_of_match);
  91
  92 static struct platform_driver ad7606_driver = {
  93         .probe = ad7606_par_probe,
  94         .id_table = ad7606_driver_ids,
  95         .driver = {
  96                 .name = "ad7606",
  97                 .pm = AD7606_PM_OPS,
  98                 .of_match_table = ad7606_of_match,
  99         },
 100 };
 101 module_platform_driver(ad7606_driver);
 102
 103 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 104 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 105 MODULE_LICENSE("GPL v2");