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
  31static const 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}
  42
  43
  44static 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
  63static 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
  81int 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}
  90EXPORT_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
 103void zorro_unregister_driver(struct zorro_driver *drv)
 104{
 105        driver_unregister(&drv->driver);
 106}
 107EXPORT_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
 121static int zorro_bus_match(struct device *dev, struct device_driver *drv)
 122{
 123        struct zorro_dev *z = to_zorro_dev(dev);
 124        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
 133static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
 134{
 135        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
 153struct 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};
 162EXPORT_SYMBOL(zorro_bus_type);
 163
 164
 165static int __init zorro_driver_init(void)
 166{
 167        return bus_register(&zorro_bus_type);
 168}
 169
 170postcore_initcall(zorro_driver_init);
 171
 172