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