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