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  */
  28 int tc_register_driver(struct tc_driver *tdrv)
  29 {
  30         return driver_register(&tdrv->driver);
  31 }
  32 EXPORT_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  */
  43 void tc_unregister_driver(struct tc_driver *tdrv)
  44 {
  45         driver_unregister(&tdrv->driver);
  46 }
  47 EXPORT_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  */
  59 static 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  */
  85 static 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
  98 struct bus_type tc_bus_type = {
  99         .name   = "tc",
 100         .match  = tc_bus_match,
 101 };
 102 EXPORT_SYMBOL(tc_bus_type);
 103
 104 static int __init tc_driver_init(void)
 105 {
 106         return bus_register(&tc_bus_type);
 107 }
 108
 109 postcore_initcall(tc_driver_init);