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/module.h>
   9 #include <linux/slab.h>
  10 #include <linux/pnp.h>
  11 #include "base.h"
  12
  13 LIST_HEAD(pnp_cards);
  14 static LIST_HEAD(pnp_card_drivers);
  15
  16
  17 static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card)
  18 {
  19         const struct pnp_card_device_id * drv_id = drv->id_table;
  20         while (*drv_id->id){
  21                 if (compare_pnp_id(card->id,drv_id->id)) {
  22                         int i = 0;
  23                         for (;;) {
  24                                 int found;
  25                                 struct pnp_dev *dev;
  26                                 if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id)
  27                                         return drv_id;
  28                                 found = 0;
  29                                 card_for_each_dev(card, dev) {
  30                                         if (compare_pnp_id(dev->id, drv_id->devs[i].id)) {
  31                                                 found = 1;
  32                                                 break;
  33                                         }
  34                                 }
  35                                 if (! found)
  36                                         break;
  37                                 i++;
  38                         }
  39                 }
  40                 drv_id++;
  41         }
  42         return NULL;
  43 }
  44
  45 static void card_remove(struct pnp_dev * dev)
  46 {
  47         dev->card_link = NULL;
  48 }
  49
  50 static void card_remove_first(struct pnp_dev * dev)
  51 {
  52         struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver);
  53         if (!dev->card || !drv)
  54                 return;
  55         if (drv->remove)
  56                 drv->remove(dev->card_link);
  57         drv->link.remove = &card_remove;
  58         kfree(dev->card_link);
  59         card_remove(dev);
  60 }
  61
  62 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
  63 {
  64         const struct pnp_card_device_id *id;
  65         struct pnp_card_link *clink;
  66         struct pnp_dev *dev;
  67
  68         if (!drv->probe)
  69                 return 0;
  70         id = match_card(drv,card);
  71         if (!id)
  72                 return 0;
  73
  74         clink = pnp_alloc(sizeof(*clink));
  75         if (!clink)
  76                 return 0;
  77         clink->card = card;
  78         clink->driver = drv;
  79         clink->pm_state = PMSG_ON;
  80
  81         if (drv->probe(clink, id) >= 0)
  82                 return 1;
  83
  84         /* Recovery */
  85         card_for_each_dev(card, dev) {
  86                 if (dev->card_link == clink)
  87                         pnp_release_card_device(dev);
  88         }
  89         kfree(clink);
  90         return 0;
  91 }
  92
  93 /**
  94  * pnp_add_card_id - adds an EISA id to the specified card
  95  * @id: pointer to a pnp_id structure
  96  * @card: pointer to the desired card
  97  *
  98  */
  99
 100 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card)
 101 {
 102         struct pnp_id * ptr;
 103         if (!id)
 104                 return -EINVAL;
 105         if (!card)
 106                 return -EINVAL;
 107         id->next = NULL;
 108         ptr = card->id;
 109         while (ptr && ptr->next)
 110                 ptr = ptr->next;
 111         if (ptr)
 112                 ptr->next = id;
 113         else
 114                 card->id = id;
 115         return 0;
 116 }
 117
 118 static void pnp_free_card_ids(struct pnp_card * card)
 119 {
 120         struct pnp_id * id;
 121         struct pnp_id *next;
 122         if (!card)
 123                 return;
 124         id = card->id;
 125         while (id) {
 126                 next = id->next;
 127                 kfree(id);
 128                 id = next;
 129         }
 130 }
 131
 132 static void pnp_release_card(struct device *dmdev)
 133 {
 134         struct pnp_card * card = to_pnp_card(dmdev);
 135         pnp_free_card_ids(card);
 136         kfree(card);
 137 }
 138
 139
 140 static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf)
 141 {
 142         char *str = buf;
 143         struct pnp_card *card = to_pnp_card(dmdev);
 144         str += sprintf(str,"%s\n", card->name);
 145         return (str - buf);
 146 }
 147
 148 static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL);
 149
 150 static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf)
 151 {
 152         char *str = buf;
 153         struct pnp_card *card = to_pnp_card(dmdev);
 154         struct pnp_id * pos = card->id;
 155
 156         while (pos) {
 157                 str += sprintf(str,"%s\n", pos->id);
 158                 pos = pos->next;
 159         }
 160         return (str - buf);
 161 }
 162
 163 static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL);
 164
 165 static int pnp_interface_attach_card(struct pnp_card *card)
 166 {
 167         int rc = device_create_file(&card->dev,&dev_attr_name);
 168         if (rc) return rc;
 169
 170         rc = device_create_file(&card->dev,&dev_attr_card_id);
 171         if (rc) goto err_name;
 172
 173         return 0;
 174
 175 err_name:
 176         device_remove_file(&card->dev,&dev_attr_name);
 177         return rc;
 178 }
 179
 180 /**
 181  * pnp_add_card - adds a PnP card to the PnP Layer
 182  * @card: pointer to the card to add
 183  */
 184
 185 int pnp_add_card(struct pnp_card * card)
 186 {
 187         int error;
 188         struct list_head * pos, * temp;
 189         if (!card || !card->protocol)
 190                 return -EINVAL;
 191
 192         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
 193         card->dev.parent = &card->protocol->dev;
 194         card->dev.bus = NULL;
 195         card->dev.release = &pnp_release_card;
 196         error = device_register(&card->dev);
 197
 198         if (error == 0) {
 199                 pnp_interface_attach_card(card);
 200                 spin_lock(&pnp_lock);
 201                 list_add_tail(&card->global_list, &pnp_cards);
 202                 list_add_tail(&card->protocol_list, &card->protocol->cards);
 203                 spin_unlock(&pnp_lock);
 204
 205                 /* we wait until now to add devices in order to ensure the drivers
 206                  * will be able to use all of the related devices on the card
 207                  * without waiting any unresonable length of time */
 208                 list_for_each(pos,&card->devices){
 209                         struct pnp_dev *dev = card_to_pnp_dev(pos);
 210                         __pnp_add_device(dev);
 211                 }
 212
 213                 /* match with card drivers */
 214                 list_for_each_safe(pos,temp,&pnp_card_drivers){
 215                         struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
 216                         card_probe(card,drv);
 217                 }
 218         } else
 219                 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
 220         return error;
 221 }
 222
 223 /**
 224  * pnp_remove_card - removes a PnP card from the PnP Layer
 225  * @card: pointer to the card to remove
 226  */
 227
 228 void pnp_remove_card(struct pnp_card * card)
 229 {
 230         struct list_head *pos, *temp;
 231         if (!card)
 232                 return;
 233         device_unregister(&card->dev);
 234         spin_lock(&pnp_lock);
 235         list_del(&card->global_list);
 236         list_del(&card->protocol_list);
 237         spin_unlock(&pnp_lock);
 238         list_for_each_safe(pos,temp,&card->devices){
 239                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 240                 pnp_remove_card_device(dev);
 241         }
 242 }
 243
 244 /**
 245  * pnp_add_card_device - adds a device to the specified card
 246  * @card: pointer to the card to add to
 247  * @dev: pointer to the device to add
 248  */
 249
 250 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
 251 {
 252         if (!card || !dev || !dev->protocol)
 253                 return -EINVAL;
 254         dev->dev.parent = &card->dev;
 255         dev->card_link = NULL;
 256         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
 257                  card->number,dev->number);
 258         spin_lock(&pnp_lock);
 259         dev->card = card;
 260         list_add_tail(&dev->card_list, &card->devices);
 261         spin_unlock(&pnp_lock);
 262         return 0;
 263 }
 264
 265 /**
 266  * pnp_remove_card_device- removes a device from the specified card
 267  * @dev: pointer to the device to remove
 268  */
 269
 270 void pnp_remove_card_device(struct pnp_dev * dev)
 271 {
 272         spin_lock(&pnp_lock);
 273         dev->card = NULL;
 274         list_del(&dev->card_list);
 275         spin_unlock(&pnp_lock);
 276         __pnp_remove_device(dev);
 277 }
 278
 279 /**
 280  * pnp_request_card_device - Searches for a PnP device under the specified card
 281  * @clink: pointer to the card link, cannot be NULL
 282  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 283  * @from: Starting place to search from. If NULL it will start from the begining.
 284  */
 285
 286 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
 287 {
 288         struct list_head * pos;
 289         struct pnp_dev * dev;
 290         struct pnp_card_driver * drv;
 291         struct pnp_card * card;
 292         if (!clink || !id)
 293                 goto done;
 294         card = clink->card;
 295         drv = clink->driver;
 296         if (!from) {
 297                 pos = card->devices.next;
 298         } else {
 299                 if (from->card != card)
 300                         goto done;
 301                 pos = from->card_list.next;
 302         }
 303         while (pos != &card->devices) {
 304                 dev = card_to_pnp_dev(pos);
 305                 if ((!dev->card_link) && compare_pnp_id(dev->id,id))
 306                         goto found;
 307                 pos = pos->next;
 308         }
 309
 310 done:
 311         return NULL;
 312
 313 found:
 314         down_write(&dev->dev.bus->subsys.rwsem);
 315         dev->card_link = clink;
 316         dev->dev.driver = &drv->link.driver;
 317         if (pnp_bus_type.probe(&dev->dev))
 318                 goto err_out;
 319         if (device_bind_driver(&dev->dev))
 320                 goto err_out;
 321
 322         up_write(&dev->dev.bus->subsys.rwsem);
 323
 324         return dev;
 325
 326 err_out:
 327         dev->dev.driver = NULL;
 328         dev->card_link = NULL;
 329         up_write(&dev->dev.bus->subsys.rwsem);
 330         return NULL;
 331 }
 332
 333 /**
 334  * pnp_release_card_device - call this when the driver no longer needs the device
 335  * @dev: pointer to the PnP device stucture
 336  */
 337
 338 void pnp_release_card_device(struct pnp_dev * dev)
 339 {
 340         struct pnp_card_driver * drv = dev->card_link->driver;
 341         if (!drv)
 342                 return;
 343         down_write(&dev->dev.bus->subsys.rwsem);
 344         drv->link.remove = &card_remove;
 345         device_release_driver(&dev->dev);
 346         drv->link.remove = &card_remove_first;
 347         up_write(&dev->dev.bus->subsys.rwsem);
 348 }
 349
 350 /*
 351  * suspend/resume callbacks
 352  */
 353 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
 354 {
 355         struct pnp_card_link *link = dev->card_link;
 356         if (link->pm_state.event == state.event)
 357                 return 0;
 358         link->pm_state = state;
 359         return link->driver->suspend(link, state);
 360 }
 361
 362 static int card_resume(struct pnp_dev *dev)
 363 {
 364         struct pnp_card_link *link = dev->card_link;
 365         if (link->pm_state.event == PM_EVENT_ON)
 366                 return 0;
 367         link->pm_state = PMSG_ON;
 368         link->driver->resume(link);
 369         return 0;
 370 }
 371
 372 /**
 373  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 374  * @drv: pointer to the driver to register
 375  */
 376
 377 int pnp_register_card_driver(struct pnp_card_driver * drv)
 378 {
 379         int error;
 380         struct list_head *pos, *temp;
 381
 382         drv->link.name = drv->name;
 383         drv->link.id_table = NULL;      /* this will disable auto matching */
 384         drv->link.flags = drv->flags;
 385         drv->link.probe = NULL;
 386         drv->link.remove = &card_remove_first;
 387         drv->link.suspend = drv->suspend ? card_suspend : NULL;
 388         drv->link.resume = drv->resume ? card_resume : NULL;
 389
 390         error = pnp_register_driver(&drv->link);
 391         if (error < 0)
 392                 return error;
 393
 394         spin_lock(&pnp_lock);
 395         list_add_tail(&drv->global_list, &pnp_card_drivers);
 396         spin_unlock(&pnp_lock);
 397
 398         list_for_each_safe(pos,temp,&pnp_cards){
 399                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
 400                 card_probe(card,drv);
 401         }
 402         return 0;
 403 }
 404
 405 /**
 406  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 407  * @drv: pointer to the driver to unregister
 408  */
 409
 410 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
 411 {
 412         spin_lock(&pnp_lock);
 413         list_del(&drv->global_list);
 414         spin_unlock(&pnp_lock);
 415         pnp_unregister_driver(&drv->link);
 416 }
 417
 418 #if 0
 419 EXPORT_SYMBOL(pnp_add_card);
 420 EXPORT_SYMBOL(pnp_remove_card);
 421 EXPORT_SYMBOL(pnp_add_card_device);
 422 EXPORT_SYMBOL(pnp_remove_card_device);
 423 EXPORT_SYMBOL(pnp_add_card_id);
 424 #endif  /*  0  */
 425 EXPORT_SYMBOL(pnp_request_card_device);
 426 EXPORT_SYMBOL(pnp_release_card_device);
 427 EXPORT_SYMBOL(pnp_register_card_driver);
 428 EXPORT_SYMBOL(pnp_unregister_card_driver);