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 the number of Zorro devices which were claimed by the driver
  69      *  during registration.  The driver remains registered even if the
  70      *  return value is zero.
  71      */
  72
  73 int zorro_register_driver(struct zorro_driver *drv)
  74 {
  75         int count = 0;
  76
  77         /* initialize common driver fields */
  78         drv->driver.name = drv->name;
  79         drv->driver.bus = &zorro_bus_type;
  80         drv->driver.probe = zorro_device_probe;
  81
  82         /* register with core */
  83         count = driver_register(&drv->driver);
  84         return count ? count : 1;
  85 }
  86
  87
  88     /**
  89      *  zorro_unregister_driver - unregister a zorro driver
  90      *  @drv: the driver structure to unregister
  91      *
  92      *  Deletes the driver structure from the list of registered Zorro drivers,
  93      *  gives it a chance to clean up by calling its remove() function for
  94      *  each device it was responsible for, and marks those devices as
  95      *  driverless.
  96      */
  97
  98 void zorro_unregister_driver(struct zorro_driver *drv)
  99 {
 100         driver_unregister(&drv->driver);
 101 }
 102
 103
 104     /**
 105      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 106      *                    device id structure
 107      *  @ids: array of Zorro device id structures to search in
 108      *  @dev: the Zorro device structure to match against
 109      *
 110      *  Used by a driver to check whether a Zorro device present in the
 111      *  system is in its list of supported devices.Returns the matching
 112      *  zorro_device_id structure or %NULL if there is no match.
 113      */
 114
 115 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 116 {
 117         struct zorro_dev *z = to_zorro_dev(dev);
 118         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 119         const struct zorro_device_id *ids = zorro_drv->id_table;
 120
 121         if (!ids)
 122                 return 0;
 123
 124         while (ids->id) {
 125                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
 126                         return 1;
 127                 ids++;
 128         }
 129         return 0;
 130 }
 131
 132
 133 struct bus_type zorro_bus_type = {
 134         .name   = "zorro",
 135         .match  = zorro_bus_match
 136 };
 137
 138
 139 static int __init zorro_driver_init(void)
 140 {
 141         return bus_register(&zorro_bus_type);
 142 }
 143
 144 postcore_initcall(zorro_driver_init);
 145
 146 EXPORT_SYMBOL(zorro_match_device);
 147 EXPORT_SYMBOL(zorro_register_driver);
 148 EXPORT_SYMBOL(zorro_unregister_driver);
 149 EXPORT_SYMBOL(zorro_dev_driver);
 150 EXPORT_SYMBOL(zorro_bus_type);