drivers/staging/iio/adc/ad7606_par.c

   1 /*
   2  * AD7606 Parallel Interface ADC driver
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   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                 dev_err(&pdev->dev, "no irq: %d\n", irq);
  59                 return irq;
  60         }
  61
  62         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  63         addr = devm_ioremap_resource(&pdev->dev, res);
  64         if (IS_ERR(addr))
  65                 return PTR_ERR(addr);
  66
  67         remap_size = resource_size(res);
  68
  69         return ad7606_probe(&pdev->dev, irq, addr,
  70                             id->name, id->driver_data,
  71                             remap_size > 1 ? &ad7606_par16_bops :
  72                             &ad7606_par8_bops);
  73 }
  74
  75 static int ad7606_par_remove(struct platform_device *pdev)
  76 {
  77         return ad7606_remove(&pdev->dev, platform_get_irq(pdev, 0));
  78 }
  79
  80 static const struct platform_device_id ad7606_driver_ids[] = {
  81         {
  82                 .name           = "ad7606-8",
  83                 .driver_data    = ID_AD7606_8,
  84         }, {
  85                 .name           = "ad7606-6",
  86                 .driver_data    = ID_AD7606_6,
  87         }, {
  88                 .name           = "ad7606-4",
  89                 .driver_data    = ID_AD7606_4,
  90         },
  91         { }
  92 };
  93
  94 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
  95
  96 static struct platform_driver ad7606_driver = {
  97         .probe = ad7606_par_probe,
  98         .remove = ad7606_par_remove,
  99         .id_table = ad7606_driver_ids,
 100         .driver = {
 101                 .name    = "ad7606",
 102                 .pm      = AD7606_PM_OPS,
 103         },
 104 };
 105
 106 module_platform_driver(ad7606_driver);
 107
 108 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 109 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 110 MODULE_LICENSE("GPL v2");