LXR linux/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
  31const struct zorro_device_id *
  32zorro_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}
  42EXPORT_SYMBOL(zorro_match_device);
  43
  44
  45static 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
  66static 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
  88int 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}
  97EXPORT_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
 110void zorro_unregister_driver(struct zorro_driver *drv)
 111{
 112        driver_unregister(&drv->driver);
 113}
 114EXPORT_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
 128static 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
 145static 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
 165struct 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};
 174EXPORT_SYMBOL(zorro_bus_type);
 175
 176
 177static int __init zorro_driver_init(void)
 178{
 179        return bus_register(&zorro_bus_type);
 180}
 181
 182postcore_initcall(zorro_driver_init);
 183
 184