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-rw-r--r--drivers/dio/dio-driver.c163
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);

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