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 EXPORT_SYMBOL(zorro_match_device);
  41
  42
  43 static int zorro_device_probe(struct device *dev)
  44 {
  45         int error = 0;
  46         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  47         struct zorro_dev *z = to_zorro_dev(dev);
  48
  49         if (!z->driver && drv->probe) {
  50                 const struct zorro_device_id *id;
  51
  52                 id = zorro_match_device(drv->id_table, z);
  53                 if (id)
  54                         error = drv->probe(z, id);
  55                 if (error >= 0) {
  56                         z->driver = drv;
  57                         error = 0;
  58                 }
  59         }
  60         return error;
  61 }
  62
  63
  64 static int zorro_device_remove(struct device *dev)
  65 {
  66         struct zorro_dev *z = to_zorro_dev(dev);
  67         struct zorro_driver *drv = to_zorro_driver(dev->driver);
  68
  69         if (drv) {
  70                 if (drv->remove)
  71                         drv->remove(z);
  72                 z->driver = NULL;
  73         }
  74         return 0;
  75 }
  76
  77
  78     /**
  79      *  zorro_register_driver - register a new Zorro driver
  80      *  @drv: the driver structure to register
  81      *
  82      *  Adds the driver structure to the list of registered drivers
  83      *  Returns zero or a negative error value.
  84      */
  85
  86 int zorro_register_driver(struct zorro_driver *drv)
  87 {
  88         /* initialize common driver fields */
  89         drv->driver.name = drv->name;
  90         drv->driver.bus = &zorro_bus_type;
  91
  92         /* register with core */
  93         return driver_register(&drv->driver);
  94 }
  95 EXPORT_SYMBOL(zorro_register_driver);
  96
  97
  98     /**
  99      *  zorro_unregister_driver - unregister a zorro driver
 100      *  @drv: the driver structure to unregister
 101      *
 102      *  Deletes the driver structure from the list of registered Zorro drivers,
 103      *  gives it a chance to clean up by calling its remove() function for
 104      *  each device it was responsible for, and marks those devices as
 105      *  driverless.
 106      */
 107
 108 void zorro_unregister_driver(struct zorro_driver *drv)
 109 {
 110         driver_unregister(&drv->driver);
 111 }
 112 EXPORT_SYMBOL(zorro_unregister_driver);
 113
 114
 115     /**
 116      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
 117      *                    device id structure
 118      *  @ids: array of Zorro device id structures to search in
 119      *  @dev: the Zorro device structure to match against
 120      *
 121      *  Used by a driver to check whether a Zorro device present in the
 122      *  system is in its list of supported devices.Returns the matching
 123      *  zorro_device_id structure or %NULL if there is no match.
 124      */
 125
 126 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 127 {
 128         struct zorro_dev *z = to_zorro_dev(dev);
 129         struct zorro_driver *zorro_drv = to_zorro_driver(drv);
 130         const struct zorro_device_id *ids = zorro_drv->id_table;
 131
 132         if (!ids)
 133                 return 0;
 134
 135         while (ids->id) {
 136                 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
 137                         return 1;
 138                 ids++;
 139         }
 140         return 0;
 141 }
 142
 143 static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
 144 {
 145 #ifdef CONFIG_HOTPLUG
 146         struct zorro_dev *z;
 147
 148         if (!dev)
 149                 return -ENODEV;
 150
 151         z = to_zorro_dev(dev);
 152         if (!z)
 153                 return -ENODEV;
 154
 155         if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
 156             add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
 157             add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
 158             add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
 159                 return -ENOMEM;
 160
 161         return 0;
 162 #else /* !CONFIG_HOTPLUG */
 163         return -ENODEV;
 164 #endif /* !CONFIG_HOTPLUG */
 165 }
 166
 167 struct bus_type zorro_bus_type = {
 168         .name   = "zorro",
 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