drivers/zorro/zorro-driver.c

   1 /*
   2  *  Zorro Driver Services
   3  *
   4  *  Copyright (C) 2003 Geert Uytterhoeven
   5  *
   6  *  Loosely based on drivers/pci/pci-driver.c
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General Public
   9  *  License.  See the file COPYING in the main directory of this archive
  10  *  for more details.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/zorro.h>
  16
  17
  18     /**
  19      *  zorro_match_device - Tell if a Zorro device structure has a matching
  20      *                       Zorro device id structure
  21      *  @ids: array of Zorro device id structures to search in
  22      *  @dev: the Zorro device structure to match against
  23      *
  24      *  Used by a driver to check whether a Zorro device present in the
  25      *  system is in its list of supported devices. Returns the matching
  26      *  zorro_device_id structure or %NULL if there is no match.
  27      */
  28
  29 const struct zorro_device_id *
  30 zorro_match_device(const struct zorro_device_id *ids,
  31                    const struct zorro_dev *z)
  32 {
  33         while (ids->id) {
  34                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
  35                         return ids;
  36                 ids++;
  37         }
  38         return NULL;
  39 }
  40
  41
  42 static int zorro_device_probe(struct device *dev)
  43 {
  44         int error = 0;
  45         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  46         struct zorro_dev *z = to_zorro_dev(dev);
  47
  48         if (!z->driver && drv->probe) {
  49                 const struct zorro_device_id *id;
  50
  51                 id = zorro_match_device(drv->id_table, z);
  52                 if (id)
  53                         error = drv->probe(z, id);
  54                 if (error >= 0) {
  55                         z->driver = drv;
  56                         error = 0;
  57                 }
  58         }
  59         return error;
  60 }
  61
  62
  63     /**
  64      *  zorro_register_driver - register a new Zorro driver
  65      *  @drv: the driver structure to register
  66      *
  67      *  Adds the driver structure to the list of registered drivers
  68      *  Returns zero or a negative error value.
  69      */
  70
  71 int zorro_register_driver(struct zorro_driver *drv)
  72 {
  73         /* initialize common driver fields */
  74         drv->driver.name = drv->name;
  75         drv->driver.bus = &zorro_bus_type;
  76
  77         /* register with core */
  78         return driver_register(&drv->driver);
  79 }
  80
  81
  82     /**
  83      *  zorro_unregister_driver - unregister a zorro driver
  84      *  @drv: the driver structure to unregister
  85      *
  86      *  Deletes the driver structure from the list of registered Zorro drivers,
  87      *  gives it a chance to clean up by calling its remove() function for
  88      *  each device it was responsible for, and marks those devices as
  89      *  driverless.
  90      */
  91
  92 void zorro_unregister_driver(struct zorro_driver *drv)
  93 {
  94         driver_unregister(&drv->driver);
  95 }
  96
  97
  98     /**
  99      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 100      *                    device id structure
 101      *  @ids: array of Zorro device id structures to search in
 102      *  @dev: the Zorro device structure to match against
 103      *
 104      *  Used by a driver to check whether a Zorro device present in the
 105      *  system is in its list of supported devices.Returns the matching
 106      *  zorro_device_id structure or %NULL if there is no match.
 107      */
 108
 109 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 110 {
 111         struct zorro_dev *z = to_zorro_dev(dev);
 112         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 113         const struct zorro_device_id *ids = zorro_drv->id_table;
 114
 115         if (!ids)
 116                 return 0;
 117
 118         while (ids->id) {
 119                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
 120                         return 1;
 121                 ids++;
 122         }
 123         return 0;
 124 }
 125
 126
 127 struct bus_type zorro_bus_type = {
 128         .name   = "zorro",
 129         .match  = zorro_bus_match,
 130         .probe  = zorro_device_probe,
 131 };
 132
 133
 134 static int __init zorro_driver_init(void)
 135 {
 136         return bus_register(&zorro_bus_type);
 137 }
 138
 139 postcore_initcall(zorro_driver_init);
 140
 141 EXPORT_SYMBOL(zorro_match_device);
 142 EXPORT_SYMBOL(zorro_register_driver);
 143 EXPORT_SYMBOL(zorro_unregister_driver);
 144 EXPORT_SYMBOL(zorro_dev_driver);
 145 EXPORT_SYMBOL(zorro_bus_type);