linux/drivers/rapidio/rio-driver.c
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   1/*
   2 * RapidIO driver support
   3 *
   4 * Copyright 2005 MontaVista Software, Inc.
   5 * Matt Porter <mporter@kernel.crashing.org>
   6 *
   7 * This program is free software; you can redistribute  it and/or modify it
   8 * under  the terms of  the GNU General  Public License as published by the
   9 * Free Software Foundation;  either version 2 of the  License, or (at your
  10 * option) any later version.
  11 */
  12
  13#include <linux/init.h>
  14#include <linux/module.h>
  15#include <linux/rio.h>
  16#include <linux/rio_ids.h>
  17
  18#include "rio.h"
  19
  20/**
  21 *  rio_match_device - Tell if a RIO device has a matching RIO device id structure
  22 *  @id: the RIO device id structure to match against
  23 *  @rdev: the RIO device structure to match against
  24 *
  25 *  Used from driver probe and bus matching to check whether a RIO device
  26 *  matches a device id structure provided by a RIO driver. Returns the
  27 *  matching &struct rio_device_id or %NULL if there is no match.
  28 */
  29static const struct rio_device_id *rio_match_device(const struct rio_device_id
  30                                                    *id,
  31                                                    const struct rio_dev *rdev)
  32{
  33        while (id->vid || id->asm_vid) {
  34                if (((id->vid == RIO_ANY_ID) || (id->vid == rdev->vid)) &&
  35                    ((id->did == RIO_ANY_ID) || (id->did == rdev->did)) &&
  36                    ((id->asm_vid == RIO_ANY_ID)
  37                     || (id->asm_vid == rdev->asm_vid))
  38                    && ((id->asm_did == RIO_ANY_ID)
  39                        || (id->asm_did == rdev->asm_did)))
  40                        return id;
  41                id++;
  42        }
  43        return NULL;
  44}
  45
  46/**
  47 * rio_dev_get - Increments the reference count of the RIO device structure
  48 *
  49 * @rdev: RIO device being referenced
  50 *
  51 * Each live reference to a device should be refcounted.
  52 *
  53 * Drivers for RIO devices should normally record such references in
  54 * their probe() methods, when they bind to a device, and release
  55 * them by calling rio_dev_put(), in their disconnect() methods.
  56 */
  57struct rio_dev *rio_dev_get(struct rio_dev *rdev)
  58{
  59        if (rdev)
  60                get_device(&rdev->dev);
  61
  62        return rdev;
  63}
  64
  65/**
  66 * rio_dev_put - Release a use of the RIO device structure
  67 *
  68 * @rdev: RIO device being disconnected
  69 *
  70 * Must be called when a user of a device is finished with it.
  71 * When the last user of the device calls this function, the
  72 * memory of the device is freed.
  73 */
  74void rio_dev_put(struct rio_dev *rdev)
  75{
  76        if (rdev)
  77                put_device(&rdev->dev);
  78}
  79
  80/**
  81 *  rio_device_probe - Tell if a RIO device structure has a matching RIO device id structure
  82 *  @dev: the RIO device structure to match against
  83 *
  84 * return 0 and set rio_dev->driver when drv claims rio_dev, else error
  85 */
  86static int rio_device_probe(struct device *dev)
  87{
  88        struct rio_driver *rdrv = to_rio_driver(dev->driver);
  89        struct rio_dev *rdev = to_rio_dev(dev);
  90        int error = -ENODEV;
  91        const struct rio_device_id *id;
  92
  93        if (!rdev->driver && rdrv->probe) {
  94                if (!rdrv->id_table)
  95                        return error;
  96                id = rio_match_device(rdrv->id_table, rdev);
  97                rio_dev_get(rdev);
  98                if (id)
  99                        error = rdrv->probe(rdev, id);
 100                if (error >= 0) {
 101                        rdev->driver = rdrv;
 102                        error = 0;
 103                } else
 104                        rio_dev_put(rdev);
 105        }
 106        return error;
 107}
 108
 109/**
 110 *  rio_device_remove - Remove a RIO device from the system
 111 *
 112 *  @dev: the RIO device structure to match against
 113 *
 114 * Remove a RIO device from the system. If it has an associated
 115 * driver, then run the driver remove() method.  Then update
 116 * the reference count.
 117 */
 118static int rio_device_remove(struct device *dev)
 119{
 120        struct rio_dev *rdev = to_rio_dev(dev);
 121        struct rio_driver *rdrv = rdev->driver;
 122
 123        if (rdrv) {
 124                if (rdrv->remove)
 125                        rdrv->remove(rdev);
 126                rdev->driver = NULL;
 127        }
 128
 129        rio_dev_put(rdev);
 130
 131        return 0;
 132}
 133
 134/**
 135 *  rio_register_driver - register a new RIO driver
 136 *  @rdrv: the RIO driver structure to register
 137 *
 138 *  Adds a &struct rio_driver to the list of registered drivers.
 139 *  Returns a negative value on error, otherwise 0. If no error
 140 *  occurred, the driver remains registered even if no device
 141 *  was claimed during registration.
 142 */
 143int rio_register_driver(struct rio_driver *rdrv)
 144{
 145        /* initialize common driver fields */
 146        rdrv->driver.name = rdrv->name;
 147        rdrv->driver.bus = &rio_bus_type;
 148
 149        /* register with core */
 150        return driver_register(&rdrv->driver);
 151}
 152
 153/**
 154 *  rio_unregister_driver - unregister a RIO driver
 155 *  @rdrv: the RIO driver structure to unregister
 156 *
 157 *  Deletes the &struct rio_driver from the list of registered RIO
 158 *  drivers, gives it a chance to clean up by calling its remove()
 159 *  function for each device it was responsible for, and marks those
 160 *  devices as driverless.
 161 */
 162void rio_unregister_driver(struct rio_driver *rdrv)
 163{
 164        driver_unregister(&rdrv->driver);
 165}
 166
 167void rio_attach_device(struct rio_dev *rdev)
 168{
 169        rdev->dev.bus = &rio_bus_type;
 170        rdev->dev.parent = &rio_bus;
 171}
 172EXPORT_SYMBOL_GPL(rio_attach_device);
 173
 174/**
 175 *  rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure
 176 *  @dev: the standard device structure to match against
 177 *  @drv: the standard driver structure containing the ids to match against
 178 *
 179 *  Used by a driver to check whether a RIO device present in the
 180 *  system is in its list of supported devices. Returns 1 if
 181 *  there is a matching &struct rio_device_id or 0 if there is
 182 *  no match.
 183 */
 184static int rio_match_bus(struct device *dev, struct device_driver *drv)
 185{
 186        struct rio_dev *rdev = to_rio_dev(dev);
 187        struct rio_driver *rdrv = to_rio_driver(drv);
 188        const struct rio_device_id *id = rdrv->id_table;
 189        const struct rio_device_id *found_id;
 190
 191        if (!id)
 192                goto out;
 193
 194        found_id = rio_match_device(id, rdev);
 195
 196        if (found_id)
 197                return 1;
 198
 199      out:return 0;
 200}
 201
 202struct device rio_bus = {
 203        .init_name = "rapidio",
 204};
 205
 206struct bus_type rio_bus_type = {
 207        .name = "rapidio",
 208        .match = rio_match_bus,
 209        .dev_attrs = rio_dev_attrs,
 210        .bus_attrs = rio_bus_attrs,
 211        .probe = rio_device_probe,
 212        .remove = rio_device_remove,
 213};
 214
 215/**
 216 *  rio_bus_init - Register the RapidIO bus with the device model
 217 *
 218 *  Registers the RIO bus device and RIO bus type with the Linux
 219 *  device model.
 220 */
 221static int __init rio_bus_init(void)
 222{
 223        if (device_register(&rio_bus) < 0)
 224                printk("RIO: failed to register RIO bus device\n");
 225        return bus_register(&rio_bus_type);
 226}
 227
 228postcore_initcall(rio_bus_init);
 229
 230EXPORT_SYMBOL_GPL(rio_register_driver);
 231EXPORT_SYMBOL_GPL(rio_unregister_driver);
 232EXPORT_SYMBOL_GPL(rio_bus_type);
 233EXPORT_SYMBOL_GPL(rio_dev_get);
 234EXPORT_SYMBOL_GPL(rio_dev_put);
 235
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