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 #include "zorro.h"
  18
  19
  20     /**
  21      *  zorro_match_device - Tell if a Zorro device structure has a matching
  22      *                       Zorro device id structure
  23      *  @ids: array of Zorro device id structures to search in
  24      *  @dev: the Zorro device structure to match against
  25      *
  26      *  Used by a driver to check whether a Zorro device present in the
  27      *  system is in its list of supported devices. Returns the matching
  28      *  zorro_device_id structure or %NULL if there is no match.
  29      */
  30
  31 static const struct zorro_device_id *
  32 zorro_match_device(const struct zorro_device_id *ids,
  33                    const struct zorro_dev *z)
  34 {
  35         while (ids->id) {
  36                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
  37                         return ids;
  38                 ids++;
  39         }
  40         return NULL;
  41 }
  42
  43
  44 static int zorro_device_probe(struct device *dev)
  45 {
  46         int error = 0;
  47         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  48         struct zorro_dev *z = to_zorro_dev(dev);
  49
  50         if (drv->probe) {
  51                 const struct zorro_device_id *id;
  52
  53                 id = zorro_match_device(drv->id_table, z);
  54                 if (id)
  55                         error = drv->probe(z, id);
  56                 if (error >= 0)
  57                         error = 0;
  58         }
  59         return error;
  60 }
  61
  62
  63 static void 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->remove)
  69                 drv->remove(z);
  70 }
  71
  72
  73     /**
  74      *  zorro_register_driver - register a new Zorro driver
  75      *  @drv: the driver structure to register
  76      *
  77      *  Adds the driver structure to the list of registered drivers
  78      *  Returns zero or a negative error value.
  79      */
  80
  81 int zorro_register_driver(struct zorro_driver *drv)
  82 {
  83         /* initialize common driver fields */
  84         drv->driver.name = drv->name;
  85         drv->driver.bus = &zorro_bus_type;
  86
  87         /* register with core */
  88         return driver_register(&drv->driver);
  89 }
  90 EXPORT_SYMBOL(zorro_register_driver);
  91
  92
  93     /**
  94      *  zorro_unregister_driver - unregister a zorro driver
  95      *  @drv: the driver structure to unregister
  96      *
  97      *  Deletes the driver structure from the list of registered Zorro drivers,
  98      *  gives it a chance to clean up by calling its remove() function for
  99      *  each device it was responsible for, and marks those devices as
 100      *  driverless.
 101      */
 102
 103 void zorro_unregister_driver(struct zorro_driver *drv)
 104 {
 105         driver_unregister(&drv->driver);
 106 }
 107 EXPORT_SYMBOL(zorro_unregister_driver);
 108
 109
 110     /**
 111      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 112      *                    device id structure
 113      *  @ids: array of Zorro device id structures to search in
 114      *  @dev: the Zorro device structure to match against
 115      *
 116      *  Used by the driver core to check whether a Zorro device present in the
 117      *  system is in a driver's list of supported devices.  Returns 1 if
 118      *  supported, and 0 if there is no match.
 119      */
 120
 121 static int zorro_bus_match(struct device *dev, const struct device_driver *drv)
 122 {
 123         struct zorro_dev *z = to_zorro_dev(dev);
 124         const struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 125         const struct zorro_device_id *ids = zorro_drv->id_table;
 126
 127         if (!ids)
 128                 return 0;
 129
 130         return !!zorro_match_device(ids, z);
 131 }
 132
 133 static int zorro_uevent(const struct device *dev, struct kobj_uevent_env *env)
 134 {
 135         const struct zorro_dev *z;
 136
 137         if (!dev)
 138                 return -ENODEV;
 139
 140         z = to_zorro_dev(dev);
 141         if (!z)
 142                 return -ENODEV;
 143
 144         if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
 145             add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
 146             add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
 147             add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
 148                 return -ENOMEM;
 149
 150         return 0;
 151 }
 152
 153 const struct bus_type zorro_bus_type = {
 154         .name           = "zorro",
 155         .dev_name       = "zorro",
 156         .dev_groups     = zorro_device_attribute_groups,
 157         .match          = zorro_bus_match,
 158         .uevent         = zorro_uevent,
 159         .probe          = zorro_device_probe,
 160         .remove         = zorro_device_remove,
 161 };
 162 EXPORT_SYMBOL(zorro_bus_type);
 163
 164
 165 static int __init zorro_driver_init(void)
 166 {
 167         return bus_register(&zorro_bus_type);
 168 }
 169
 170 postcore_initcall(zorro_driver_init);
 171