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                         int i = 0;
  31                         for (;;) {
  32                                 int found;
  33                                 struct pnp_dev *dev;
  34                                 if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id)
  35                                         return drv_id;
  36                                 found = 0;
  37                                 card_for_each_dev(card, dev) {
  38                                         if (compare_pnp_id(dev->id, drv_id->devs[i].id)) {
  39                                                 found = 1;
  40                                                 break;
  41                                         }
  42                                 }
  43                                 if (! found)
  44                                         break;
  45                                 i++;
  46                         }
  47                 }
  48                 drv_id++;
  49         }
  50         return NULL;
  51 }
  52
  53 static void card_remove(struct pnp_dev * dev)
  54 {
  55         dev->card_link = NULL;
  56 }
  57
  58 static void card_remove_first(struct pnp_dev * dev)
  59 {
  60         struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver);
  61         if (!dev->card || !drv)
  62                 return;
  63         if (drv->remove)
  64                 drv->remove(dev->card_link);
  65         drv->link.remove = &card_remove;
  66         kfree(dev->card_link);
  67         card_remove(dev);
  68 }
  69
  70 static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv)
  71 {
  72         const struct pnp_card_device_id *id = match_card(drv,card);
  73         if (id) {
  74                 struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
  75                 if (!clink)
  76                         return 0;
  77                 clink->card = card;
  78                 clink->driver = drv;
  79                 if (drv->probe) {
  80                         if (drv->probe(clink, id)>=0)
  81                                 return 1;
  82                         else {
  83                                 struct pnp_dev * dev;
  84                                 card_for_each_dev(card, dev) {
  85                                         if (dev->card_link == clink)
  86                                                 pnp_release_card_device(dev);
  87                                 }
  88                                 kfree(clink);
  89                         }
  90                 } else
  91                         return 1;
  92         }
  93         return 0;
  94 }
  95
  96 /**
  97  * pnp_add_card_id - adds an EISA id to the specified card
  98  * @id: pointer to a pnp_id structure
  99  * @card: pointer to the desired card
 100  *
 101  */
 102
 103 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card)
 104 {
 105         struct pnp_id * ptr;
 106         if (!id)
 107                 return -EINVAL;
 108         if (!card)
 109                 return -EINVAL;
 110         id->next = NULL;
 111         ptr = card->id;
 112         while (ptr && ptr->next)
 113                 ptr = ptr->next;
 114         if (ptr)
 115                 ptr->next = id;
 116         else
 117                 card->id = id;
 118         return 0;
 119 }
 120
 121 static void pnp_free_card_ids(struct pnp_card * card)
 122 {
 123         struct pnp_id * id;
 124         struct pnp_id *next;
 125         if (!card)
 126                 return;
 127         id = card->id;
 128         while (id) {
 129                 next = id->next;
 130                 kfree(id);
 131                 id = next;
 132         }
 133 }
 134
 135 static void pnp_release_card(struct device *dmdev)
 136 {
 137         struct pnp_card * card = to_pnp_card(dmdev);
 138         pnp_free_card_ids(card);
 139         kfree(card);
 140 }
 141
 142
 143 static ssize_t pnp_show_card_name(struct device *dmdev, char *buf)
 144 {
 145         char *str = buf;
 146         struct pnp_card *card = to_pnp_card(dmdev);
 147         str += sprintf(str,"%s\n", card->name);
 148         return (str - buf);
 149 }
 150
 151 static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL);
 152
 153 static ssize_t pnp_show_card_ids(struct device *dmdev, char *buf)
 154 {
 155         char *str = buf;
 156         struct pnp_card *card = to_pnp_card(dmdev);
 157         struct pnp_id * pos = card->id;
 158
 159         while (pos) {
 160                 str += sprintf(str,"%s\n", pos->id);
 161                 pos = pos->next;
 162         }
 163         return (str - buf);
 164 }
 165
 166 static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL);
 167
 168 static int pnp_interface_attach_card(struct pnp_card *card)
 169 {
 170         device_create_file(&card->dev,&dev_attr_name);
 171         device_create_file(&card->dev,&dev_attr_card_id);
 172         return 0;
 173 }
 174
 175 /**
 176  * pnp_add_card - adds a PnP card to the PnP Layer
 177  * @card: pointer to the card to add
 178  */
 179
 180 int pnp_add_card(struct pnp_card * card)
 181 {
 182         int error;
 183         struct list_head * pos, * temp;
 184         if (!card || !card->protocol)
 185                 return -EINVAL;
 186
 187         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
 188         card->dev.parent = &card->protocol->dev;
 189         card->dev.bus = NULL;
 190         card->dev.release = &pnp_release_card;
 191         error = device_register(&card->dev);
 192
 193         if (error == 0) {
 194                 pnp_interface_attach_card(card);
 195                 spin_lock(&pnp_lock);
 196                 list_add_tail(&card->global_list, &pnp_cards);
 197                 list_add_tail(&card->protocol_list, &card->protocol->cards);
 198                 spin_unlock(&pnp_lock);
 199
 200                 /* we wait until now to add devices in order to ensure the drivers
 201                  * will be able to use all of the related devices on the card
 202                  * without waiting any unresonable length of time */
 203                 list_for_each(pos,&card->devices){
 204                         struct pnp_dev *dev = card_to_pnp_dev(pos);
 205                         __pnp_add_device(dev);
 206                 }
 207
 208                 /* match with card drivers */
 209                 list_for_each_safe(pos,temp,&pnp_card_drivers){
 210                         struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
 211                         card_probe(card,drv);
 212                 }
 213         } else
 214                 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
 215         return error;
 216 }
 217
 218 /**
 219  * pnp_remove_card - removes a PnP card from the PnP Layer
 220  * @card: pointer to the card to remove
 221  */
 222
 223 void pnp_remove_card(struct pnp_card * card)
 224 {
 225         struct list_head *pos, *temp;
 226         if (!card)
 227                 return;
 228         device_unregister(&card->dev);
 229         spin_lock(&pnp_lock);
 230         list_del(&card->global_list);
 231         list_del(&card->protocol_list);
 232         spin_unlock(&pnp_lock);
 233         list_for_each_safe(pos,temp,&card->devices){
 234                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 235                 pnp_remove_card_device(dev);
 236         }
 237 }
 238
 239 /**
 240  * pnp_add_card_device - adds a device to the specified card
 241  * @card: pointer to the card to add to
 242  * @dev: pointer to the device to add
 243  */
 244
 245 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
 246 {
 247         if (!card || !dev || !dev->protocol)
 248                 return -EINVAL;
 249         dev->dev.parent = &card->dev;
 250         dev->card_link = NULL;
 251         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
 252                  card->number,dev->number);
 253         spin_lock(&pnp_lock);
 254         dev->card = card;
 255         list_add_tail(&dev->card_list, &card->devices);
 256         spin_unlock(&pnp_lock);
 257         return 0;
 258 }
 259
 260 /**
 261  * pnp_remove_card_device- removes a device from the specified card
 262  * @card: pointer to the card to remove from
 263  * @dev: pointer to the device to remove
 264  */
 265
 266 void pnp_remove_card_device(struct pnp_dev * dev)
 267 {
 268         spin_lock(&pnp_lock);
 269         dev->card = NULL;
 270         list_del(&dev->card_list);
 271         spin_unlock(&pnp_lock);
 272         __pnp_remove_device(dev);
 273 }
 274
 275 /**
 276  * pnp_request_card_device - Searches for a PnP device under the specified card
 277  * @lcard: pointer to the card link, cannot be NULL
 278  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 279  * @from: Starting place to search from. If NULL it will start from the begining.
 280  */
 281
 282 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
 283 {
 284         struct list_head * pos;
 285         struct pnp_dev * dev;
 286         struct pnp_card_driver * drv;
 287         struct pnp_card * card;
 288         if (!clink || !id)
 289                 goto done;
 290         card = clink->card;
 291         drv = clink->driver;
 292         if (!from) {
 293                 pos = card->devices.next;
 294         } else {
 295                 if (from->card != card)
 296                         goto done;
 297                 pos = from->card_list.next;
 298         }
 299         while (pos != &card->devices) {
 300                 dev = card_to_pnp_dev(pos);
 301                 if ((!dev->card_link) && compare_pnp_id(dev->id,id))
 302                         goto found;
 303                 pos = pos->next;
 304         }
 305
 306 done:
 307         return NULL;
 308
 309 found:
 310         down_write(&dev->dev.bus->subsys.rwsem);
 311         dev->card_link = clink;
 312         dev->dev.driver = &drv->link.driver;
 313         if (drv->link.driver.probe) {
 314                 if (drv->link.driver.probe(&dev->dev)) {
 315                         dev->dev.driver = NULL;
 316                         return NULL;
 317                 }
 318         }
 319         device_bind_driver(&dev->dev);
 320         up_write(&dev->dev.bus->subsys.rwsem);
 321
 322         return dev;
 323 }
 324
 325 /**
 326  * pnp_release_card_device - call this when the driver no longer needs the device
 327  * @dev: pointer to the PnP device stucture
 328  */
 329
 330 void pnp_release_card_device(struct pnp_dev * dev)
 331 {
 332         struct pnp_card_driver * drv = dev->card_link->driver;
 333         if (!drv)
 334                 return;
 335         down_write(&dev->dev.bus->subsys.rwsem);
 336         drv->link.remove = &card_remove;
 337         device_release_driver(&dev->dev);
 338         drv->link.remove = &card_remove_first;
 339         up_write(&dev->dev.bus->subsys.rwsem);
 340 }
 341
 342 /**
 343  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 344  * @drv: pointer to the driver to register
 345  */
 346
 347 int pnp_register_card_driver(struct pnp_card_driver * drv)
 348 {
 349         int count = 0;
 350         struct list_head *pos, *temp;
 351
 352         drv->link.name = drv->name;
 353         drv->link.id_table = NULL;      /* this will disable auto matching */
 354         drv->link.flags = drv->flags;
 355         drv->link.probe = NULL;
 356         drv->link.remove = &card_remove_first;
 357
 358         spin_lock(&pnp_lock);
 359         list_add_tail(&drv->global_list, &pnp_card_drivers);
 360         spin_unlock(&pnp_lock);
 361         pnp_register_driver(&drv->link);
 362
 363         list_for_each_safe(pos,temp,&pnp_cards){
 364                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
 365                 count += card_probe(card,drv);
 366         }
 367         return count;
 368 }
 369
 370 /**
 371  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 372  * @drv: pointer to the driver to unregister
 373  */
 374
 375 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
 376 {
 377         spin_lock(&pnp_lock);
 378         list_del(&drv->global_list);
 379         spin_unlock(&pnp_lock);
 380         pnp_unregister_driver(&drv->link);
 381 }
 382
 383 EXPORT_SYMBOL(pnp_add_card);
 384 EXPORT_SYMBOL(pnp_remove_card);
 385 EXPORT_SYMBOL(pnp_add_card_device);
 386 EXPORT_SYMBOL(pnp_remove_card_device);
 387 EXPORT_SYMBOL(pnp_add_card_id);
 388 EXPORT_SYMBOL(pnp_request_card_device);
 389 EXPORT_SYMBOL(pnp_release_card_device);
 390 EXPORT_SYMBOL(pnp_register_card_driver);
 391 EXPORT_SYMBOL(pnp_unregister_card_driver);