LXR linux/drivers/tc/tc-driver.c

   1/*
   2 *      TURBOchannel driver services.
   3 *
   4 *      Copyright (c) 2005  James Simmons
   5 *      Copyright (c) 2006  Maciej W. Rozycki
   6 *
   7 *      Loosely based on drivers/dio/dio-driver.c and
   8 *      drivers/pci/pci-driver.c.
   9 *
  10 *      This file is subject to the terms and conditions of the GNU
  11 *      General Public License.  See the file "COPYING" in the main
  12 *      directory of this archive for more details.
  13 */
  14
  15#include <linux/init.h>
  16#include <linux/module.h>
  17#include <linux/tc.h>
  18
  19/**
  20 * tc_register_driver - register a new TC driver
  21 * @drv: the driver structure to register
  22 *
  23 * Adds the driver structure to the list of registered drivers
  24 * Returns a negative value on error, otherwise 0.
  25 * If no error occurred, the driver remains registered even if
  26 * no device was claimed during registration.
  27 */
  28int tc_register_driver(struct tc_driver *tdrv)
  29{
  30        return driver_register(&tdrv->driver);
  31}
  32EXPORT_SYMBOL(tc_register_driver);
  33
  34/**
  35 * tc_unregister_driver - unregister a TC driver
  36 * @drv: the driver structure to unregister
  37 *
  38 * Deletes the driver structure from the list of registered TC drivers,
  39 * gives it a chance to clean up by calling its remove() function for
  40 * each device it was responsible for, and marks those devices as
  41 * driverless.
  42 */
  43void tc_unregister_driver(struct tc_driver *tdrv)
  44{
  45        driver_unregister(&tdrv->driver);
  46}
  47EXPORT_SYMBOL(tc_unregister_driver);
  48
  49/**
  50 * tc_match_device - tell if a TC device structure has a matching
  51 *                   TC device ID structure
  52 * @tdrv: the TC driver to earch for matching TC device ID strings
  53 * @tdev: the TC device structure to match against
  54 *
  55 * Used by a driver to check whether a TC device present in the
  56 * system is in its list of supported devices.  Returns the matching
  57 * tc_device_id structure or %NULL if there is no match.
  58 */
  59static const struct tc_device_id *tc_match_device(struct tc_driver *tdrv,
  60                                                  struct tc_dev *tdev)
  61{
  62        const struct tc_device_id *id = tdrv->id_table;
  63
  64        if (id) {
  65                while (id->name[0] || id->vendor[0]) {
  66                        if (strcmp(tdev->name, id->name) == 0 &&
  67                            strcmp(tdev->vendor, id->vendor) == 0)
  68                                return id;
  69                        id++;
  70                }
  71        }
  72        return NULL;
  73}
  74
  75/**
  76 * tc_bus_match - Tell if a device structure has a matching
  77 *                TC device ID structure
  78 * @dev: the device structure to match against
  79 * @drv: the device driver to search for matching TC device ID strings
  80 *
  81 * Used by a driver to check whether a TC device present in the
  82 * system is in its list of supported devices.  Returns 1 if there
  83 * is a match or 0 otherwise.
  84 */
  85static int tc_bus_match(struct device *dev, struct device_driver *drv)
  86{
  87        struct tc_dev *tdev = to_tc_dev(dev);
  88        struct tc_driver *tdrv = to_tc_driver(drv);
  89        const struct tc_device_id *id;
  90
  91        id = tc_match_device(tdrv, tdev);
  92        if (id)
  93                return 1;
  94
  95        return 0;
  96}
  97
  98struct bus_type tc_bus_type = {
  99        .name   = "tc",
 100        .match  = tc_bus_match,
 101};
 102EXPORT_SYMBOL(tc_bus_type);
 103
 104static int __init tc_driver_init(void)
 105{
 106        return bus_register(&tc_bus_type);
 107}
 108
 109postcore_initcall(tc_driver_init);
 110