drivers/pnp/card.c

   1 /*
   2  * card.c - contains functions for managing groups of PnP devices
   3  *
   4  * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
   5  *
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11
  12 #ifdef CONFIG_PNP_DEBUG
  13         #define DEBUG
  14 #else
  15         #undef DEBUG
  16 #endif
  17
  18 #include <linux/pnp.h>
  19 #include "base.h"
  20
  21 LIST_HEAD(pnp_cards);
  22 LIST_HEAD(pnp_card_drivers);
  23
  24
  25 static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card)
  26 {
  27         const struct pnp_card_device_id * drv_id = drv->id_table;
  28         while (*drv_id->id){
  29                 if (compare_pnp_id(card->id,drv_id->id))
  30                         return drv_id;
  31                 drv_id++;
  32         }
  33         return NULL;
  34 }
  35
  36 static void card_remove(struct pnp_dev * dev)
  37 {
  38         dev->card_link = NULL;
  39 }
  40
  41 static void card_remove_first(struct pnp_dev * dev)
  42 {
  43         struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver);
  44         if (!dev->card || !drv)
  45                 return;
  46         if (drv->remove)
  47                 drv->remove(dev->card_link);
  48         drv->link.remove = &card_remove;
  49         kfree(dev->card_link);
  50         card_remove(dev);
  51 }
  52
  53 static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv)
  54 {
  55         const struct pnp_card_device_id *id = match_card(drv,card);
  56         if (id) {
  57                 struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
  58                 if (!clink)
  59                         return 0;
  60                 clink->card = card;
  61                 clink->driver = drv;
  62                 if (drv->probe) {
  63                         if (drv->probe(clink, id)>=0)
  64                                 return 1;
  65                         else {
  66                                 struct pnp_dev * dev;
  67                                 card_for_each_dev(card, dev) {
  68                                         if (dev->card_link == clink)
  69                                                 pnp_release_card_device(dev);
  70                                 }
  71                                 kfree(clink);
  72                         }
  73                 } else
  74                         return 1;
  75         }
  76         return 0;
  77 }
  78
  79 /**
  80  * pnp_add_card_id - adds an EISA id to the specified card
  81  * @id: pointer to a pnp_id structure
  82  * @card: pointer to the desired card
  83  *
  84  */
  85
  86 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card)
  87 {
  88         struct pnp_id * ptr;
  89         if (!id)
  90                 return -EINVAL;
  91         if (!card)
  92                 return -EINVAL;
  93         id->next = NULL;
  94         ptr = card->id;
  95         while (ptr && ptr->next)
  96                 ptr = ptr->next;
  97         if (ptr)
  98                 ptr->next = id;
  99         else
 100                 card->id = id;
 101         return 0;
 102 }
 103
 104 static void pnp_free_card_ids(struct pnp_card * card)
 105 {
 106         struct pnp_id * id;
 107         struct pnp_id *next;
 108         if (!card)
 109                 return;
 110         id = card->id;
 111         while (id) {
 112                 next = id->next;
 113                 kfree(id);
 114                 id = next;
 115         }
 116 }
 117
 118 static void pnp_release_card(struct device *dmdev)
 119 {
 120         struct pnp_card * card = to_pnp_card(dmdev);
 121         pnp_free_card_ids(card);
 122         kfree(card);
 123 }
 124
 125 /**
 126  * pnp_add_card - adds a PnP card to the PnP Layer
 127  * @card: pointer to the card to add
 128  */
 129
 130 int pnp_add_card(struct pnp_card * card)
 131 {
 132         int error;
 133         struct list_head * pos, * temp;
 134         if (!card || !card->protocol)
 135                 return -EINVAL;
 136
 137         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
 138         card->dev.parent = &card->protocol->dev;
 139         card->dev.bus = NULL;
 140         card->dev.release = &pnp_release_card;
 141         error = device_register(&card->dev);
 142
 143         if (error == 0) {
 144                 spin_lock(&pnp_lock);
 145                 list_add_tail(&card->global_list, &pnp_cards);
 146                 list_add_tail(&card->protocol_list, &card->protocol->cards);
 147                 spin_unlock(&pnp_lock);
 148
 149                 /* we wait until now to add devices in order to ensure the drivers
 150                  * will be able to use all of the related devices on the card
 151                  * without waiting any unresonable length of time */
 152                 list_for_each(pos,&card->devices){
 153                         struct pnp_dev *dev = card_to_pnp_dev(pos);
 154                         __pnp_add_device(dev);
 155                 }
 156
 157                 /* match with card drivers */
 158                 list_for_each_safe(pos,temp,&pnp_card_drivers){
 159                         struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
 160                         card_probe(card,drv);
 161                 }
 162         } else
 163                 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
 164         return error;
 165 }
 166
 167 /**
 168  * pnp_remove_card - removes a PnP card from the PnP Layer
 169  * @card: pointer to the card to remove
 170  */
 171
 172 void pnp_remove_card(struct pnp_card * card)
 173 {
 174         struct list_head *pos, *temp;
 175         if (!card)
 176                 return;
 177         device_unregister(&card->dev);
 178         spin_lock(&pnp_lock);
 179         list_del(&card->global_list);
 180         list_del(&card->protocol_list);
 181         spin_unlock(&pnp_lock);
 182         list_for_each_safe(pos,temp,&card->devices){
 183                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 184                 pnp_remove_card_device(dev);
 185         }
 186 }
 187
 188 /**
 189  * pnp_add_card_device - adds a device to the specified card
 190  * @card: pointer to the card to add to
 191  * @dev: pointer to the device to add
 192  */
 193
 194 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
 195 {
 196         if (!card || !dev || !dev->protocol)
 197                 return -EINVAL;
 198         dev->dev.parent = &card->dev;
 199         dev->card_link = NULL;
 200         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
 201                  card->number,dev->number);
 202         spin_lock(&pnp_lock);
 203         dev->card = card;
 204         list_add_tail(&dev->card_list, &card->devices);
 205         spin_unlock(&pnp_lock);
 206         return 0;
 207 }
 208
 209 /**
 210  * pnp_remove_card_device- removes a device from the specified card
 211  * @card: pointer to the card to remove from
 212  * @dev: pointer to the device to remove
 213  */
 214
 215 void pnp_remove_card_device(struct pnp_dev * dev)
 216 {
 217         spin_lock(&pnp_lock);
 218         dev->card = NULL;
 219         list_del(&dev->card_list);
 220         spin_unlock(&pnp_lock);
 221         __pnp_remove_device(dev);
 222 }
 223
 224 /**
 225  * pnp_request_card_device - Searches for a PnP device under the specified card
 226  * @lcard: pointer to the card link, cannot be NULL
 227  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 228  * @from: Starting place to search from. If NULL it will start from the begining.
 229  */
 230
 231 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
 232 {
 233         struct list_head * pos;
 234         struct pnp_dev * dev;
 235         struct pnp_card_driver * drv;
 236         struct pnp_card * card;
 237         if (!clink || !id)
 238                 goto done;
 239         card = clink->card;
 240         drv = clink->driver;
 241         if (!from) {
 242                 pos = card->devices.next;
 243         } else {
 244                 if (from->card != card)
 245                         goto done;
 246                 pos = from->card_list.next;
 247         }
 248         while (pos != &card->devices) {
 249                 dev = card_to_pnp_dev(pos);
 250                 if ((!dev->card_link) && compare_pnp_id(dev->id,id))
 251                         goto found;
 252                 pos = pos->next;
 253         }
 254
 255 done:
 256         return NULL;
 257
 258 found:
 259         down_write(&dev->dev.bus->subsys.rwsem);
 260         dev->card_link = clink;
 261         dev->dev.driver = &drv->link.driver;
 262         if (drv->link.driver.probe) {
 263                 if (drv->link.driver.probe(&dev->dev)) {
 264                         dev->dev.driver = NULL;
 265                         return NULL;
 266                 }
 267         }
 268         device_bind_driver(&dev->dev);
 269         up_write(&dev->dev.bus->subsys.rwsem);
 270
 271         return dev;
 272 }
 273
 274 /**
 275  * pnp_release_card_device - call this when the driver no longer needs the device
 276  * @dev: pointer to the PnP device stucture
 277  */
 278
 279 void pnp_release_card_device(struct pnp_dev * dev)
 280 {
 281         struct pnp_card_driver * drv = dev->card_link->driver;
 282         if (!drv)
 283                 return;
 284         down_write(&dev->dev.bus->subsys.rwsem);
 285         drv->link.remove = &card_remove;
 286         device_release_driver(&dev->dev);
 287         drv->link.remove = &card_remove_first;
 288         up_write(&dev->dev.bus->subsys.rwsem);
 289 }
 290
 291 /**
 292  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 293  * @drv: pointer to the driver to register
 294  */
 295
 296 int pnp_register_card_driver(struct pnp_card_driver * drv)
 297 {
 298         int count = 0;
 299         struct list_head *pos, *temp;
 300
 301         drv->link.name = drv->name;
 302         drv->link.id_table = NULL;      /* this will disable auto matching */
 303         drv->link.flags = drv->flags;
 304         drv->link.probe = NULL;
 305         drv->link.remove = &card_remove_first;
 306
 307         spin_lock(&pnp_lock);
 308         list_add_tail(&drv->global_list, &pnp_card_drivers);
 309         spin_unlock(&pnp_lock);
 310         pnp_register_driver(&drv->link);
 311
 312         list_for_each_safe(pos,temp,&pnp_cards){
 313                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
 314                 count += card_probe(card,drv);
 315         }
 316         return count;
 317 }
 318
 319 /**
 320  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 321  * @drv: pointer to the driver to unregister
 322  */
 323
 324 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
 325 {
 326         spin_lock(&pnp_lock);
 327         list_del(&drv->global_list);
 328         spin_unlock(&pnp_lock);
 329         pnp_unregister_driver(&drv->link);
 330 }
 331
 332 EXPORT_SYMBOL(pnp_add_card);
 333 EXPORT_SYMBOL(pnp_remove_card);
 334 EXPORT_SYMBOL(pnp_add_card_device);
 335 EXPORT_SYMBOL(pnp_remove_card_device);
 336 EXPORT_SYMBOL(pnp_add_card_id);
 337 EXPORT_SYMBOL(pnp_request_card_device);
 338 EXPORT_SYMBOL(pnp_release_card_device);
 339 EXPORT_SYMBOL(pnp_register_card_driver);
 340 EXPORT_SYMBOL(pnp_unregister_card_driver);