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 "ad7606.h"
  16
  17 static int ad7606_par16_read_block(struct device *dev,
  18                                  int count, void *buf)
  19 {
  20         struct platform_device *pdev = to_platform_device(dev);
  21         struct ad7606_state *st = platform_get_drvdata(pdev);
  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 platform_device *pdev = to_platform_device(dev);
  36         struct ad7606_state *st = platform_get_drvdata(pdev);
  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 __devinit ad7606_par_probe(struct platform_device *pdev)
  48 {
  49         struct resource *res;
  50         struct ad7606_state *st;
  51         void __iomem *addr;
  52         resource_size_t remap_size;
  53         int ret, irq;
  54
  55         irq = platform_get_irq(pdev, 0);
  56         if (irq < 0) {
  57                 dev_err(&pdev->dev, "no irq\n");
  58                 return -ENODEV;
  59         }
  60
  61         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  62         if (!res)
  63                 return -ENODEV;
  64
  65         remap_size = resource_size(res);
  66
  67         /* Request the regions */
  68         if (!request_mem_region(res->start, remap_size, "iio-ad7606")) {
  69                 ret = -EBUSY;
  70                 goto out1;
  71         }
  72         addr = ioremap(res->start, remap_size);
  73         if (!addr) {
  74                 ret = -ENOMEM;
  75                 goto out1;
  76         }
  77
  78         st = ad7606_probe(&pdev->dev, irq, addr,
  79                           platform_get_device_id(pdev)->driver_data,
  80                           remap_size > 1 ? &ad7606_par16_bops :
  81                           &ad7606_par8_bops);
  82
  83         if (IS_ERR(st))  {
  84                 ret = PTR_ERR(st);
  85                 goto out2;
  86         }
  87
  88         platform_set_drvdata(pdev, st);
  89
  90         return 0;
  91
  92 out2:
  93         iounmap(addr);
  94 out1:
  95         release_mem_region(res->start, remap_size);
  96
  97         return ret;
  98 }
  99
 100 static int __devexit ad7606_par_remove(struct platform_device *pdev)
 101 {
 102         struct ad7606_state *st = platform_get_drvdata(pdev);
 103         struct resource *res;
 104
 105         ad7606_remove(st);
 106
 107         iounmap(st->base_address);
 108         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 109         release_mem_region(res->start, resource_size(res));
 110
 111         platform_set_drvdata(pdev, NULL);
 112
 113         return 0;
 114 }
 115
 116 #ifdef CONFIG_PM
 117 static int ad7606_par_suspend(struct device *dev)
 118 {
 119         struct ad7606_state *st = dev_get_drvdata(dev);
 120
 121         ad7606_suspend(st);
 122
 123         return 0;
 124 }
 125
 126 static int ad7606_par_resume(struct device *dev)
 127 {
 128         struct ad7606_state *st = dev_get_drvdata(dev);
 129
 130         ad7606_resume(st);
 131
 132         return 0;
 133 }
 134
 135 static const struct dev_pm_ops ad7606_pm_ops = {
 136         .suspend = ad7606_par_suspend,
 137         .resume  = ad7606_par_resume,
 138 };
 139 #define AD7606_PAR_PM_OPS (&ad7606_pm_ops)
 140
 141 #else
 142 #define AD7606_PAR_PM_OPS NULL
 143 #endif  /* CONFIG_PM */
 144
 145 static struct platform_device_id ad7606_driver_ids[] = {
 146         {
 147                 .name           = "ad7606-8",
 148                 .driver_data    = ID_AD7606_8,
 149         }, {
 150                 .name           = "ad7606-6",
 151                 .driver_data    = ID_AD7606_6,
 152         }, {
 153                 .name           = "ad7606-4",
 154                 .driver_data    = ID_AD7606_4,
 155         },
 156         { }
 157 };
 158
 159 MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
 160
 161 static struct platform_driver ad7606_driver = {
 162         .probe = ad7606_par_probe,
 163         .remove = __devexit_p(ad7606_par_remove),
 164         .id_table = ad7606_driver_ids,
 165         .driver = {
 166                 .name    = "ad7606",
 167                 .owner  = THIS_MODULE,
 168                 .pm    = AD7606_PAR_PM_OPS,
 169         },
 170 };
 171
 172 static int __init ad7606_init(void)
 173 {
 174         return platform_driver_register(&ad7606_driver);
 175 }
 176
 177 static void __exit ad7606_cleanup(void)
 178 {
 179         platform_driver_unregister(&ad7606_driver);
 180 }
 181
 182 module_init(ad7606_init);
 183 module_exit(ad7606_cleanup);
 184
 185 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 186 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 187 MODULE_LICENSE("GPL v2");
 188 MODULE_ALIAS("platform:ad7606_par");