1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c
new file mode 100644
index 000000000000..ffe6f44ac76f
--- /dev/null
+++ b/drivers/dio/dio-driver.c
@@ -0,0 +1,163 @@
+/*
+ *  DIO Driver Services
+ *
+ *  Copyright (C) 2004 Jochen Friedrich
+ *
+ *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive
+ *  for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/dio.h>
+
+
+        /**
+         *  dio_match_device - Tell if a DIO device structure has a matching
+         *                     DIO device id structure
+         *  @ids: array of DIO device id structures to search in
+         *  @dev: the DIO device structure to match against
+         *
+         *  Used by a driver to check whether a DIO device present in the
+         *  system is in its list of supported devices. Returns the matching
+         *  dio_device_id structure or %NULL if there is no match.
+         */
+
+const struct dio_device_id *
+dio_match_device(const struct dio_device_id *ids,
+                   const struct dio_dev *d)
+{
+        while (ids->id) {
+                if (ids->id == DIO_WILDCARD)
+                        return ids;
+                if (DIO_NEEDSSECID(ids->id & 0xff)) {
+                        if (ids->id == d->id)
+                                return ids;
+                } else {
+                        if ((ids->id & 0xff) == (d->id & 0xff))
+                                return ids;
+                }
+                ids++;
+        }
+        return NULL;
+}
+
+static int dio_device_probe(struct device *dev)
+{
+        int error = 0;
+        struct dio_driver *drv = to_dio_driver(dev->driver);
+        struct dio_dev *d = to_dio_dev(dev);
+
+        if (!d->driver && drv->probe) {
+                const struct dio_device_id *id;
+
+                id = dio_match_device(drv->id_table, d);
+                if (id)
+                        error = drv->probe(d, id);
+                if (error >= 0) {
+                        d->driver = drv;
+                        error = 0;
+                }
+        }
+        return error;
+}
+
+
+        /**
+         *  dio_register_driver - register a new DIO driver
+         *  @drv: the driver structure to register
+         *
+         *  Adds the driver structure to the list of registered drivers
+         *  Returns the number of DIO devices which were claimed by the driver
+         *  during registration.  The driver remains registered even if the
+         *  return value is zero.
+         */
+
+int dio_register_driver(struct dio_driver *drv)
+{
+        int count = 0;
+
+        /* initialize common driver fields */
+        drv->driver.name = drv->name;
+        drv->driver.bus = &dio_bus_type;
+        drv->driver.probe = dio_device_probe;
+
+        /* register with core */
+        count = driver_register(&drv->driver);
+        return count ? count : 1;
+}
+
+
+        /**
+         *  dio_unregister_driver - unregister a DIO driver
+         *  @drv: the driver structure to unregister
+         *
+         *  Deletes the driver structure from the list of registered DIO drivers,
+         *  gives it a chance to clean up by calling its remove() function for
+         *  each device it was responsible for, and marks those devices as
+         *  driverless.
+         */
+
+void dio_unregister_driver(struct dio_driver *drv)
+{
+        driver_unregister(&drv->driver);
+}
+
+
+        /**
+         *  dio_bus_match - Tell if a DIO device structure has a matching DIO
+         *                  device id structure
+         *  @ids: array of DIO device id structures to search in
+         *  @dev: the DIO device structure to match against
+         *
+         *  Used by a driver to check whether a DIO device present in the
+         *  system is in its list of supported devices. Returns the matching
+         *  dio_device_id structure or %NULL if there is no match.
+         */
+
+static int dio_bus_match(struct device *dev, struct device_driver *drv)
+{
+        struct dio_dev *d = to_dio_dev(dev);
+        struct dio_driver *dio_drv = to_dio_driver(drv);
+        const struct dio_device_id *ids = dio_drv->id_table;
+
+        if (!ids)
+                return 0;
+
+        while (ids->id) {
+                if (ids->id == DIO_WILDCARD)
+                        return 1;
+                if (DIO_NEEDSSECID(ids->id & 0xff)) {
+                        if (ids->id == d->id)
+                                return 1;
+                } else {
+                        if ((ids->id & 0xff) == (d->id & 0xff))
+                                return 1;
+                }
+                ids++;
+        }
+        return 0;
+}
+
+
+struct bus_type dio_bus_type = {
+        .name   = "dio",
+        .match  = dio_bus_match
+};
+
+
+static int __init dio_driver_init(void)
+{
+        return bus_register(&dio_bus_type);
+}
+
+postcore_initcall(dio_driver_init);
+
+EXPORT_SYMBOL(dio_match_device);
+EXPORT_SYMBOL(dio_register_driver);
+EXPORT_SYMBOL(dio_unregister_driver);
+EXPORT_SYMBOL(dio_dev_driver);
+EXPORT_SYMBOL(dio_bus_type);