root/drivers/rapidio/rio-driver.c

DEFINITIONS

1. rio_match_device
2. rio_dev_get
3. rio_dev_put
4. rio_device_probe
5. rio_device_remove
6. rio_device_shutdown
7. rio_register_driver
8. rio_unregister_driver
9. rio_attach_device
10. rio_match_bus
11. rio_uevent
12. rio_bus_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * RapidIO driver support
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  */
   8 
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/rio.h>
  12 #include <linux/rio_ids.h>
  13 
  14 #include "rio.h"
  15 
  16 /**
  17  *  rio_match_device - Tell if a RIO device has a matching RIO device id structure
  18  *  @id: the RIO device id structure to match against
  19  *  @rdev: the RIO device structure to match against
  20  *
  21  *  Used from driver probe and bus matching to check whether a RIO device
  22  *  matches a device id structure provided by a RIO driver. Returns the
  23  *  matching &struct rio_device_id or %NULL if there is no match.
  24  */
  25 static const struct rio_device_id *rio_match_device(const struct rio_device_id
  26                                                     *id,
  27                                                     const struct rio_dev *rdev)
  28 {
  29         while (id->vid || id->asm_vid) {
  30                 if (((id->vid == RIO_ANY_ID) || (id->vid == rdev->vid)) &&
  31                     ((id->did == RIO_ANY_ID) || (id->did == rdev->did)) &&
  32                     ((id->asm_vid == RIO_ANY_ID)
  33                      || (id->asm_vid == rdev->asm_vid))
  34                     && ((id->asm_did == RIO_ANY_ID)
  35                         || (id->asm_did == rdev->asm_did)))
  36                         return id;
  37                 id++;
  38         }
  39         return NULL;
  40 }
  41 
  42 /**
  43  * rio_dev_get - Increments the reference count of the RIO device structure
  44  *
  45  * @rdev: RIO device being referenced
  46  *
  47  * Each live reference to a device should be refcounted.
  48  *
  49  * Drivers for RIO devices should normally record such references in
  50  * their probe() methods, when they bind to a device, and release
  51  * them by calling rio_dev_put(), in their disconnect() methods.
  52  */
  53 struct rio_dev *rio_dev_get(struct rio_dev *rdev)
  54 {
  55         if (rdev)
  56                 get_device(&rdev->dev);
  57 
  58         return rdev;
  59 }
  60 
  61 /**
  62  * rio_dev_put - Release a use of the RIO device structure
  63  *
  64  * @rdev: RIO device being disconnected
  65  *
  66  * Must be called when a user of a device is finished with it.
  67  * When the last user of the device calls this function, the
  68  * memory of the device is freed.
  69  */
  70 void rio_dev_put(struct rio_dev *rdev)
  71 {
  72         if (rdev)
  73                 put_device(&rdev->dev);
  74 }
  75 
  76 /**
  77  *  rio_device_probe - Tell if a RIO device structure has a matching RIO device id structure
  78  *  @dev: the RIO device structure to match against
  79  *
  80  * return 0 and set rio_dev->driver when drv claims rio_dev, else error
  81  */
  82 static int rio_device_probe(struct device *dev)
  83 {
  84         struct rio_driver *rdrv = to_rio_driver(dev->driver);
  85         struct rio_dev *rdev = to_rio_dev(dev);
  86         int error = -ENODEV;
  87         const struct rio_device_id *id;
  88 
  89         if (!rdev->driver && rdrv->probe) {
  90                 if (!rdrv->id_table)
  91                         return error;
  92                 id = rio_match_device(rdrv->id_table, rdev);
  93                 rio_dev_get(rdev);
  94                 if (id)
  95                         error = rdrv->probe(rdev, id);
  96                 if (error >= 0) {
  97                         rdev->driver = rdrv;
  98                         error = 0;
  99                 } else
 100                         rio_dev_put(rdev);
 101         }
 102         return error;
 103 }
 104 
 105 /**
 106  *  rio_device_remove - Remove a RIO device from the system
 107  *
 108  *  @dev: the RIO device structure to match against
 109  *
 110  * Remove a RIO device from the system. If it has an associated
 111  * driver, then run the driver remove() method.  Then update
 112  * the reference count.
 113  */
 114 static int rio_device_remove(struct device *dev)
 115 {
 116         struct rio_dev *rdev = to_rio_dev(dev);
 117         struct rio_driver *rdrv = rdev->driver;
 118 
 119         if (rdrv) {
 120                 if (rdrv->remove)
 121                         rdrv->remove(rdev);
 122                 rdev->driver = NULL;
 123         }
 124 
 125         rio_dev_put(rdev);
 126 
 127         return 0;
 128 }
 129 
 130 static void rio_device_shutdown(struct device *dev)
 131 {
 132         struct rio_dev *rdev = to_rio_dev(dev);
 133         struct rio_driver *rdrv = rdev->driver;
 134 
 135         dev_dbg(dev, "RIO: %s\n", __func__);
 136 
 137         if (rdrv && rdrv->shutdown)
 138                 rdrv->shutdown(rdev);
 139 }
 140 
 141 /**
 142  *  rio_register_driver - register a new RIO driver
 143  *  @rdrv: the RIO driver structure to register
 144  *
 145  *  Adds a &struct rio_driver to the list of registered drivers.
 146  *  Returns a negative value on error, otherwise 0. If no error
 147  *  occurred, the driver remains registered even if no device
 148  *  was claimed during registration.
 149  */
 150 int rio_register_driver(struct rio_driver *rdrv)
 151 {
 152         /* initialize common driver fields */
 153         rdrv->driver.name = rdrv->name;
 154         rdrv->driver.bus = &rio_bus_type;
 155 
 156         /* register with core */
 157         return driver_register(&rdrv->driver);
 158 }
 159 
 160 /**
 161  *  rio_unregister_driver - unregister a RIO driver
 162  *  @rdrv: the RIO driver structure to unregister
 163  *
 164  *  Deletes the &struct rio_driver from the list of registered RIO
 165  *  drivers, gives it a chance to clean up by calling its remove()
 166  *  function for each device it was responsible for, and marks those
 167  *  devices as driverless.
 168  */
 169 void rio_unregister_driver(struct rio_driver *rdrv)
 170 {
 171         driver_unregister(&rdrv->driver);
 172 }
 173 
 174 void rio_attach_device(struct rio_dev *rdev)
 175 {
 176         rdev->dev.bus = &rio_bus_type;
 177 }
 178 EXPORT_SYMBOL_GPL(rio_attach_device);
 179 
 180 /**
 181  *  rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure
 182  *  @dev: the standard device structure to match against
 183  *  @drv: the standard driver structure containing the ids to match against
 184  *
 185  *  Used by a driver to check whether a RIO device present in the
 186  *  system is in its list of supported devices. Returns 1 if
 187  *  there is a matching &struct rio_device_id or 0 if there is
 188  *  no match.
 189  */
 190 static int rio_match_bus(struct device *dev, struct device_driver *drv)
 191 {
 192         struct rio_dev *rdev = to_rio_dev(dev);
 193         struct rio_driver *rdrv = to_rio_driver(drv);
 194         const struct rio_device_id *id = rdrv->id_table;
 195         const struct rio_device_id *found_id;
 196 
 197         if (!id)
 198                 goto out;
 199 
 200         found_id = rio_match_device(id, rdev);
 201 
 202         if (found_id)
 203                 return 1;
 204 
 205       out:return 0;
 206 }
 207 
 208 static int rio_uevent(struct device *dev, struct kobj_uevent_env *env)
 209 {
 210         struct rio_dev *rdev;
 211 
 212         if (!dev)
 213                 return -ENODEV;
 214 
 215         rdev = to_rio_dev(dev);
 216         if (!rdev)
 217                 return -ENODEV;
 218 
 219         if (add_uevent_var(env, "MODALIAS=rapidio:v%04Xd%04Xav%04Xad%04X",
 220                            rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did))
 221                 return -ENOMEM;
 222         return 0;
 223 }
 224 
 225 struct class rio_mport_class = {
 226         .name           = "rapidio_port",
 227         .owner          = THIS_MODULE,
 228         .dev_groups     = rio_mport_groups,
 229 };
 230 EXPORT_SYMBOL_GPL(rio_mport_class);
 231 
 232 struct bus_type rio_bus_type = {
 233         .name = "rapidio",
 234         .match = rio_match_bus,
 235         .dev_groups = rio_dev_groups,
 236         .bus_groups = rio_bus_groups,
 237         .probe = rio_device_probe,
 238         .remove = rio_device_remove,
 239         .shutdown = rio_device_shutdown,
 240         .uevent = rio_uevent,
 241 };
 242 
 243 /**
 244  *  rio_bus_init - Register the RapidIO bus with the device model
 245  *
 246  *  Registers the RIO mport device class and RIO bus type with the Linux
 247  *  device model.
 248  */
 249 static int __init rio_bus_init(void)
 250 {
 251         int ret;
 252 
 253         ret = class_register(&rio_mport_class);
 254         if (!ret) {
 255                 ret = bus_register(&rio_bus_type);
 256                 if (ret)
 257                         class_unregister(&rio_mport_class);
 258         }
 259         return ret;
 260 }
 261 
 262 postcore_initcall(rio_bus_init);
 263 
 264 EXPORT_SYMBOL_GPL(rio_register_driver);
 265 EXPORT_SYMBOL_GPL(rio_unregister_driver);
 266 EXPORT_SYMBOL_GPL(rio_bus_type);
 267 EXPORT_SYMBOL_GPL(rio_dev_get);
 268 EXPORT_SYMBOL_GPL(rio_dev_put);