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         device_create_file(&card->dev,&dev_attr_name);
 168         device_create_file(&card->dev,&dev_attr_card_id);
 169         return 0;
 170 }
 171
 172 /**
 173  * pnp_add_card - adds a PnP card to the PnP Layer
 174  * @card: pointer to the card to add
 175  */
 176
 177 int pnp_add_card(struct pnp_card * card)
 178 {
 179         int error;
 180         struct list_head * pos, * temp;
 181         if (!card || !card->protocol)
 182                 return -EINVAL;
 183
 184         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
 185         card->dev.parent = &card->protocol->dev;
 186         card->dev.bus = NULL;
 187         card->dev.release = &pnp_release_card;
 188         error = device_register(&card->dev);
 189
 190         if (error == 0) {
 191                 pnp_interface_attach_card(card);
 192                 spin_lock(&pnp_lock);
 193                 list_add_tail(&card->global_list, &pnp_cards);
 194                 list_add_tail(&card->protocol_list, &card->protocol->cards);
 195                 spin_unlock(&pnp_lock);
 196
 197                 /* we wait until now to add devices in order to ensure the drivers
 198                  * will be able to use all of the related devices on the card
 199                  * without waiting any unresonable length of time */
 200                 list_for_each(pos,&card->devices){
 201                         struct pnp_dev *dev = card_to_pnp_dev(pos);
 202                         __pnp_add_device(dev);
 203                 }
 204
 205                 /* match with card drivers */
 206                 list_for_each_safe(pos,temp,&pnp_card_drivers){
 207                         struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
 208                         card_probe(card,drv);
 209                 }
 210         } else
 211                 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
 212         return error;
 213 }
 214
 215 /**
 216  * pnp_remove_card - removes a PnP card from the PnP Layer
 217  * @card: pointer to the card to remove
 218  */
 219
 220 void pnp_remove_card(struct pnp_card * card)
 221 {
 222         struct list_head *pos, *temp;
 223         if (!card)
 224                 return;
 225         device_unregister(&card->dev);
 226         spin_lock(&pnp_lock);
 227         list_del(&card->global_list);
 228         list_del(&card->protocol_list);
 229         spin_unlock(&pnp_lock);
 230         list_for_each_safe(pos,temp,&card->devices){
 231                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 232                 pnp_remove_card_device(dev);
 233         }
 234 }
 235
 236 /**
 237  * pnp_add_card_device - adds a device to the specified card
 238  * @card: pointer to the card to add to
 239  * @dev: pointer to the device to add
 240  */
 241
 242 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
 243 {
 244         if (!card || !dev || !dev->protocol)
 245                 return -EINVAL;
 246         dev->dev.parent = &card->dev;
 247         dev->card_link = NULL;
 248         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
 249                  card->number,dev->number);
 250         spin_lock(&pnp_lock);
 251         dev->card = card;
 252         list_add_tail(&dev->card_list, &card->devices);
 253         spin_unlock(&pnp_lock);
 254         return 0;
 255 }
 256
 257 /**
 258  * pnp_remove_card_device- removes a device from the specified card
 259  * @dev: pointer to the device to remove
 260  */
 261
 262 void pnp_remove_card_device(struct pnp_dev * dev)
 263 {
 264         spin_lock(&pnp_lock);
 265         dev->card = NULL;
 266         list_del(&dev->card_list);
 267         spin_unlock(&pnp_lock);
 268         __pnp_remove_device(dev);
 269 }
 270
 271 /**
 272  * pnp_request_card_device - Searches for a PnP device under the specified card
 273  * @clink: pointer to the card link, cannot be NULL
 274  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 275  * @from: Starting place to search from. If NULL it will start from the begining.
 276  */
 277
 278 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
 279 {
 280         struct list_head * pos;
 281         struct pnp_dev * dev;
 282         struct pnp_card_driver * drv;
 283         struct pnp_card * card;
 284         if (!clink || !id)
 285                 goto done;
 286         card = clink->card;
 287         drv = clink->driver;
 288         if (!from) {
 289                 pos = card->devices.next;
 290         } else {
 291                 if (from->card != card)
 292                         goto done;
 293                 pos = from->card_list.next;
 294         }
 295         while (pos != &card->devices) {
 296                 dev = card_to_pnp_dev(pos);
 297                 if ((!dev->card_link) && compare_pnp_id(dev->id,id))
 298                         goto found;
 299                 pos = pos->next;
 300         }
 301
 302 done:
 303         return NULL;
 304
 305 found:
 306         down_write(&dev->dev.bus->subsys.rwsem);
 307         dev->card_link = clink;
 308         dev->dev.driver = &drv->link.driver;
 309         if (pnp_bus_type.probe(&dev->dev)) {
 310                 dev->dev.driver = NULL;
 311                 dev->card_link = NULL;
 312                 up_write(&dev->dev.bus->subsys.rwsem);
 313                 return NULL;
 314         }
 315         device_bind_driver(&dev->dev);
 316         up_write(&dev->dev.bus->subsys.rwsem);
 317
 318         return dev;
 319 }
 320
 321 /**
 322  * pnp_release_card_device - call this when the driver no longer needs the device
 323  * @dev: pointer to the PnP device stucture
 324  */
 325
 326 void pnp_release_card_device(struct pnp_dev * dev)
 327 {
 328         struct pnp_card_driver * drv = dev->card_link->driver;
 329         if (!drv)
 330                 return;
 331         down_write(&dev->dev.bus->subsys.rwsem);
 332         drv->link.remove = &card_remove;
 333         device_release_driver(&dev->dev);
 334         drv->link.remove = &card_remove_first;
 335         up_write(&dev->dev.bus->subsys.rwsem);
 336 }
 337
 338 /*
 339  * suspend/resume callbacks
 340  */
 341 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
 342 {
 343         struct pnp_card_link *link = dev->card_link;
 344         if (link->pm_state.event == state.event)
 345                 return 0;
 346         link->pm_state = state;
 347         return link->driver->suspend(link, state);
 348 }
 349
 350 static int card_resume(struct pnp_dev *dev)
 351 {
 352         struct pnp_card_link *link = dev->card_link;
 353         if (link->pm_state.event == PM_EVENT_ON)
 354                 return 0;
 355         link->pm_state = PMSG_ON;
 356         link->driver->resume(link);
 357         return 0;
 358 }
 359
 360 /**
 361  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 362  * @drv: pointer to the driver to register
 363  */
 364
 365 int pnp_register_card_driver(struct pnp_card_driver * drv)
 366 {
 367         int error;
 368         struct list_head *pos, *temp;
 369
 370         drv->link.name = drv->name;
 371         drv->link.id_table = NULL;      /* this will disable auto matching */
 372         drv->link.flags = drv->flags;
 373         drv->link.probe = NULL;
 374         drv->link.remove = &card_remove_first;
 375         drv->link.suspend = drv->suspend ? card_suspend : NULL;
 376         drv->link.resume = drv->resume ? card_resume : NULL;
 377
 378         error = pnp_register_driver(&drv->link);
 379         if (error < 0)
 380                 return error;
 381
 382         spin_lock(&pnp_lock);
 383         list_add_tail(&drv->global_list, &pnp_card_drivers);
 384         spin_unlock(&pnp_lock);
 385
 386         list_for_each_safe(pos,temp,&pnp_cards){
 387                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
 388                 card_probe(card,drv);
 389         }
 390         return 0;
 391 }
 392
 393 /**
 394  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 395  * @drv: pointer to the driver to unregister
 396  */
 397
 398 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
 399 {
 400         spin_lock(&pnp_lock);
 401         list_del(&drv->global_list);
 402         spin_unlock(&pnp_lock);
 403         pnp_unregister_driver(&drv->link);
 404 }
 405
 406 #if 0
 407 EXPORT_SYMBOL(pnp_add_card);
 408 EXPORT_SYMBOL(pnp_remove_card);
 409 EXPORT_SYMBOL(pnp_add_card_device);
 410 EXPORT_SYMBOL(pnp_remove_card_device);
 411 EXPORT_SYMBOL(pnp_add_card_id);
 412 #endif  /*  0  */
 413 EXPORT_SYMBOL(pnp_request_card_device);
 414 EXPORT_SYMBOL(pnp_release_card_device);
 415 EXPORT_SYMBOL(pnp_register_card_driver);
 416 EXPORT_SYMBOL(pnp_unregister_card_driver);