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 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 EXPORT_SYMBOL(zorro_match_device);
  43
  44
  45 static int zorro_device_probe(struct device *dev)
  46 {
  47         int error = 0;
  48         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  49         struct zorro_dev *z = to_zorro_dev(dev);
  50
  51         if (!z->driver && drv->probe) {
  52                 const struct zorro_device_id *id;
  53
  54                 id = zorro_match_device(drv->id_table, z);
  55                 if (id)
  56                         error = drv->probe(z, id);
  57                 if (error >= 0) {
  58                         z->driver = drv;
  59                         error = 0;
  60                 }
  61         }
  62         return error;
  63 }
  64
  65
  66 static int zorro_device_remove(struct device *dev)
  67 {
  68         struct zorro_dev *z = to_zorro_dev(dev);
  69         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  70
  71         if (drv) {
  72                 if (drv->remove)
  73                         drv->remove(z);
  74                 z->driver = NULL;
  75         }
  76         return 0;
  77 }
  78
  79
  80     /**
  81      *  zorro_register_driver - register a new Zorro driver
  82      *  @drv: the driver structure to register
  83      *
  84      *  Adds the driver structure to the list of registered drivers
  85      *  Returns zero or a negative error value.
  86      */
  87
  88 int zorro_register_driver(struct zorro_driver *drv)
  89 {
  90         /* initialize common driver fields */
  91         drv->driver.name = drv->name;
  92         drv->driver.bus = &zorro_bus_type;
  93
  94         /* register with core */
  95         return driver_register(&drv->driver);
  96 }
  97 EXPORT_SYMBOL(zorro_register_driver);
  98
  99
 100     /**
 101      *  zorro_unregister_driver - unregister a zorro driver
 102      *  @drv: the driver structure to unregister
 103      *
 104      *  Deletes the driver structure from the list of registered Zorro drivers,
 105      *  gives it a chance to clean up by calling its remove() function for
 106      *  each device it was responsible for, and marks those devices as
 107      *  driverless.
 108      */
 109
 110 void zorro_unregister_driver(struct zorro_driver *drv)
 111 {
 112         driver_unregister(&drv->driver);
 113 }
 114 EXPORT_SYMBOL(zorro_unregister_driver);
 115
 116
 117     /**
 118      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 119      *                    device id structure
 120      *  @ids: array of Zorro device id structures to search in
 121      *  @dev: the Zorro device structure to match against
 122      *
 123      *  Used by a driver to check whether a Zorro device present in the
 124      *  system is in its list of supported devices.Returns the matching
 125      *  zorro_device_id structure or %NULL if there is no match.
 126      */
 127
 128 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 129 {
 130         struct zorro_dev *z = to_zorro_dev(dev);
 131         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 132         const struct zorro_device_id *ids = zorro_drv->id_table;
 133
 134         if (!ids)
 135                 return 0;
 136
 137         while (ids->id) {
 138                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
 139                         return 1;
 140                 ids++;
 141         }
 142         return 0;
 143 }
 144
 145 static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
 146 {
 147         struct zorro_dev *z;
 148
 149         if (!dev)
 150                 return -ENODEV;
 151
 152         z = to_zorro_dev(dev);
 153         if (!z)
 154                 return -ENODEV;
 155
 156         if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
 157             add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
 158             add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
 159             add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
 160                 return -ENOMEM;
 161
 162         return 0;
 163 }
 164
 165 struct bus_type zorro_bus_type = {
 166         .name           = "zorro",
 167         .dev_name       = "zorro",
 168         .dev_groups     = zorro_device_attribute_groups,
 169         .match          = zorro_bus_match,
 170         .uevent         = zorro_uevent,
 171         .probe          = zorro_device_probe,
 172         .remove         = zorro_device_remove,
 173 };
 174 EXPORT_SYMBOL(zorro_bus_type);
 175
 176
 177 static int __init zorro_driver_init(void)
 178 {
 179         return bus_register(&zorro_bus_type);
 180 }
 181
 182 postcore_initcall(zorro_driver_init);
 183