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