release/src-rt-6.x.4708/linux/linux-2.6.36/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 static int zorro_device_remove(struct device *dev)
  64 {
  65         struct zorro_dev *z = to_zorro_dev(dev);
  66         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  67
  68         if (drv) {
  69                 if (drv->remove)
  70                         drv->remove(z);
  71                 z->driver = NULL;
  72         }
  73         return 0;
  74 }
  75
  76
  77     /**
  78      *  zorro_register_driver - register a new Zorro driver
  79      *  @drv: the driver structure to register
  80      *
  81      *  Adds the driver structure to the list of registered drivers
  82      *  Returns zero or a negative error value.
  83      */
  84
  85 int zorro_register_driver(struct zorro_driver *drv)
  86 {
  87         /* initialize common driver fields */
  88         drv->driver.name = drv->name;
  89         drv->driver.bus = &zorro_bus_type;
  90
  91         /* register with core */
  92         return driver_register(&drv->driver);
  93 }
  94
  95
  96     /**
  97      *  zorro_unregister_driver - unregister a zorro driver
  98      *  @drv: the driver structure to unregister
  99      *
 100      *  Deletes the driver structure from the list of registered Zorro drivers,
 101      *  gives it a chance to clean up by calling its remove() function for
 102      *  each device it was responsible for, and marks those devices as
 103      *  driverless.
 104      */
 105
 106 void zorro_unregister_driver(struct zorro_driver *drv)
 107 {
 108         driver_unregister(&drv->driver);
 109 }
 110
 111
 112     /**
 113      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 114      *                    device id structure
 115      *  @ids: array of Zorro device id structures to search in
 116      *  @dev: the Zorro device structure to match against
 117      *
 118      *  Used by a driver to check whether a Zorro device present in the
 119      *  system is in its list of supported devices.Returns the matching
 120      *  zorro_device_id structure or %NULL if there is no match.
 121      */
 122
 123 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 124 {
 125         struct zorro_dev *z = to_zorro_dev(dev);
 126         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 127         const struct zorro_device_id *ids = zorro_drv->id_table;
 128
 129         if (!ids)
 130                 return 0;
 131
 132         while (ids->id) {
 133                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
 134                         return 1;
 135                 ids++;
 136         }
 137         return 0;
 138 }
 139
 140 static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
 141 {
 142 #ifdef CONFIG_HOTPLUG
 143         struct zorro_dev *z;
 144
 145         if (!dev)
 146                 return -ENODEV;
 147
 148         z = to_zorro_dev(dev);
 149         if (!z)
 150                 return -ENODEV;
 151
 152         if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
 153             add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
 154             add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
 155             add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
 156                 return -ENOMEM;
 157
 158         return 0;
 159 #else /* !CONFIG_HOTPLUG */
 160         return -ENODEV;
 161 #endif /* !CONFIG_HOTPLUG */
 162 }
 163
 164 struct bus_type zorro_bus_type = {
 165         .name   = "zorro",
 166         .match  = zorro_bus_match,
 167         .uevent = zorro_uevent,
 168         .probe  = zorro_device_probe,
 169         .remove = zorro_device_remove,
 170 };
 171
 172
 173 static int __init zorro_driver_init(void)
 174 {
 175         return bus_register(&zorro_bus_type);
 176 }
 177
 178 postcore_initcall(zorro_driver_init);
 179
 180 EXPORT_SYMBOL(zorro_match_device);
 181 EXPORT_SYMBOL(zorro_register_driver);
 182 EXPORT_SYMBOL(zorro_unregister_driver);
 183 EXPORT_SYMBOL(zorro_bus_type);