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 (!z->driver && 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                         z->driver = drv;
  58                         error = 0;
  59                 }
  60         }
  61         return error;
  62 }
  63
  64
  65 static int zorro_device_remove(struct device *dev)
  66 {
  67         struct zorro_dev *z = to_zorro_dev(dev);
  68         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  69
  70         if (drv) {
  71                 if (drv->remove)
  72                         drv->remove(z);
  73                 z->driver = NULL;
  74         }
  75         return 0;
  76 }
  77
  78
  79     /**
  80      *  zorro_register_driver - register a new Zorro driver
  81      *  @drv: the driver structure to register
  82      *
  83      *  Adds the driver structure to the list of registered drivers
  84      *  Returns zero or a negative error value.
  85      */
  86
  87 int zorro_register_driver(struct zorro_driver *drv)
  88 {
  89         /* initialize common driver fields */
  90         drv->driver.name = drv->name;
  91         drv->driver.bus = &zorro_bus_type;
  92
  93         /* register with core */
  94         return driver_register(&drv->driver);
  95 }
  96 EXPORT_SYMBOL(zorro_register_driver);
  97
  98
  99     /**
 100      *  zorro_unregister_driver - unregister a zorro driver
 101      *  @drv: the driver structure to unregister
 102      *
 103      *  Deletes the driver structure from the list of registered Zorro drivers,
 104      *  gives it a chance to clean up by calling its remove() function for
 105      *  each device it was responsible for, and marks those devices as
 106      *  driverless.
 107      */
 108
 109 void zorro_unregister_driver(struct zorro_driver *drv)
 110 {
 111         driver_unregister(&drv->driver);
 112 }
 113 EXPORT_SYMBOL(zorro_unregister_driver);
 114
 115
 116     /**
 117      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 118      *                    device id structure
 119      *  @ids: array of Zorro device id structures to search in
 120      *  @dev: the Zorro device structure to match against
 121      *
 122      *  Used by the driver core to check whether a Zorro device present in the
 123      *  system is in a driver's list of supported devices.  Returns 1 if
 124      *  supported, and 0 if there is no match.
 125      */
 126
 127 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 128 {
 129         struct zorro_dev *z = to_zorro_dev(dev);
 130         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 131         const struct zorro_device_id *ids = zorro_drv->id_table;
 132
 133         if (!ids)
 134                 return 0;
 135
 136         return !!zorro_match_device(ids, z);
 137 }
 138
 139 static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
 140 {
 141         struct zorro_dev *z;
 142
 143         if (!dev)
 144                 return -ENODEV;
 145
 146         z = to_zorro_dev(dev);
 147         if (!z)
 148                 return -ENODEV;
 149
 150         if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
 151             add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
 152             add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
 153             add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
 154                 return -ENOMEM;
 155
 156         return 0;
 157 }
 158
 159 struct bus_type zorro_bus_type = {
 160         .name           = "zorro",
 161         .dev_name       = "zorro",
 162         .dev_groups     = zorro_device_attribute_groups,
 163         .match          = zorro_bus_match,
 164         .uevent         = zorro_uevent,
 165         .probe          = zorro_device_probe,
 166         .remove         = zorro_device_remove,
 167 };
 168 EXPORT_SYMBOL(zorro_bus_type);
 169
 170
 171 static int __init zorro_driver_init(void)
 172 {
 173         return bus_register(&zorro_bus_type);
 174 }
 175
 176 postcore_initcall(zorro_driver_init);
 177