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