linux/drivers/zorro/zorro-driver.c
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   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
  29const struct zorro_device_id *
  30zorro_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}
  40EXPORT_SYMBOL(zorro_match_device);
  41
  42
  43static 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
  64static 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
  86int 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}
  95EXPORT_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
 108void zorro_unregister_driver(struct zorro_driver *drv)
 109{
 110        driver_unregister(&drv->driver);
 111}
 112EXPORT_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
 126static 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
 143static 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
 167struct 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};
 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
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