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/ctype.h>
   9 #include <linux/slab.h>
  10 #include <linux/pnp.h>
  11 #include <linux/dma-mapping.h>
  12 #include "base.h"
  13
  14 LIST_HEAD(pnp_cards);
  15 static LIST_HEAD(pnp_card_drivers);
  16
  17 static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
  18                                                    struct pnp_card *card)
  19 {
  20         const struct pnp_card_device_id *drv_id = drv->id_table;
  21
  22         while (*drv_id->id) {
  23                 if (compare_pnp_id(card->id, drv_id->id)) {
  24                         int i = 0;
  25
  26                         for (;;) {
  27                                 int found;
  28                                 struct pnp_dev *dev;
  29
  30                                 if (i == PNP_MAX_DEVICES ||
  31                                     !*drv_id->devs[i].id)
  32                                         return drv_id;
  33                                 found = 0;
  34                                 card_for_each_dev(card, dev) {
  35                                         if (compare_pnp_id(dev->id,
  36                                                    drv_id->devs[i].id)) {
  37                                                 found = 1;
  38                                                 break;
  39                                         }
  40                                 }
  41                                 if (!found)
  42                                         break;
  43                                 i++;
  44                         }
  45                 }
  46                 drv_id++;
  47         }
  48         return NULL;
  49 }
  50
  51 static void card_remove(struct pnp_dev *dev)
  52 {
  53         dev->card_link = NULL;
  54 }
  55
  56 static void card_remove_first(struct pnp_dev *dev)
  57 {
  58         struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
  59
  60         if (!dev->card || !drv)
  61                 return;
  62         if (drv->remove)
  63                 drv->remove(dev->card_link);
  64         drv->link.remove = &card_remove;
  65         kfree(dev->card_link);
  66         card_remove(dev);
  67 }
  68
  69 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
  70 {
  71         const struct pnp_card_device_id *id;
  72         struct pnp_card_link *clink;
  73         struct pnp_dev *dev;
  74
  75         if (!drv->probe)
  76                 return 0;
  77         id = match_card(drv, card);
  78         if (!id)
  79                 return 0;
  80
  81         clink = pnp_alloc(sizeof(*clink));
  82         if (!clink)
  83                 return 0;
  84         clink->card = card;
  85         clink->driver = drv;
  86         clink->pm_state = PMSG_ON;
  87
  88         if (drv->probe(clink, id) >= 0)
  89                 return 1;
  90
  91         /* Recovery */
  92         card_for_each_dev(card, dev) {
  93                 if (dev->card_link == clink)
  94                         pnp_release_card_device(dev);
  95         }
  96         kfree(clink);
  97         return 0;
  98 }
  99
 100 /**
 101  * pnp_add_card_id - adds an EISA id to the specified card
 102  * @id: pointer to a pnp_id structure
 103  * @card: pointer to the desired card
 104  */
 105 static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
 106 {
 107         struct pnp_id *dev_id, *ptr;
 108
 109         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 110         if (!dev_id)
 111                 return NULL;
 112
 113         dev_id->id[0] = id[0];
 114         dev_id->id[1] = id[1];
 115         dev_id->id[2] = id[2];
 116         dev_id->id[3] = tolower(id[3]);
 117         dev_id->id[4] = tolower(id[4]);
 118         dev_id->id[5] = tolower(id[5]);
 119         dev_id->id[6] = tolower(id[6]);
 120         dev_id->id[7] = '\0';
 121
 122         dev_id->next = NULL;
 123         ptr = card->id;
 124         while (ptr && ptr->next)
 125                 ptr = ptr->next;
 126         if (ptr)
 127                 ptr->next = dev_id;
 128         else
 129                 card->id = dev_id;
 130
 131         return dev_id;
 132 }
 133
 134 static void pnp_free_card_ids(struct pnp_card *card)
 135 {
 136         struct pnp_id *id;
 137         struct pnp_id *next;
 138
 139         id = card->id;
 140         while (id) {
 141                 next = id->next;
 142                 kfree(id);
 143                 id = next;
 144         }
 145 }
 146
 147 static void pnp_release_card(struct device *dmdev)
 148 {
 149         struct pnp_card *card = to_pnp_card(dmdev);
 150
 151         pnp_free_card_ids(card);
 152         kfree(card);
 153 }
 154
 155 struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
 156 {
 157         struct pnp_card *card;
 158         struct pnp_id *dev_id;
 159
 160         card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
 161         if (!card)
 162                 return NULL;
 163
 164         card->protocol = protocol;
 165         card->number = id;
 166
 167         card->dev.parent = &card->protocol->dev;
 168         dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
 169
 170         card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
 171         card->dev.dma_mask = &card->dev.coherent_dma_mask;
 172
 173         dev_id = pnp_add_card_id(card, pnpid);
 174         if (!dev_id) {
 175                 kfree(card);
 176                 return NULL;
 177         }
 178
 179         return card;
 180 }
 181
 182 static ssize_t pnp_show_card_name(struct device *dmdev,
 183                                   struct device_attribute *attr, char *buf)
 184 {
 185         char *str = buf;
 186         struct pnp_card *card = to_pnp_card(dmdev);
 187
 188         str += sprintf(str, "%s\n", card->name);
 189         return (str - buf);
 190 }
 191
 192 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
 193
 194 static ssize_t pnp_show_card_ids(struct device *dmdev,
 195                                  struct device_attribute *attr, char *buf)
 196 {
 197         char *str = buf;
 198         struct pnp_card *card = to_pnp_card(dmdev);
 199         struct pnp_id *pos = card->id;
 200
 201         while (pos) {
 202                 str += sprintf(str, "%s\n", pos->id);
 203                 pos = pos->next;
 204         }
 205         return (str - buf);
 206 }
 207
 208 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
 209
 210 static int pnp_interface_attach_card(struct pnp_card *card)
 211 {
 212         int rc = device_create_file(&card->dev, &dev_attr_name);
 213
 214         if (rc)
 215                 return rc;
 216
 217         rc = device_create_file(&card->dev, &dev_attr_card_id);
 218         if (rc)
 219                 goto err_name;
 220
 221         return 0;
 222
 223 err_name:
 224         device_remove_file(&card->dev, &dev_attr_name);
 225         return rc;
 226 }
 227
 228 /**
 229  * pnp_add_card - adds a PnP card to the PnP Layer
 230  * @card: pointer to the card to add
 231  */
 232 int pnp_add_card(struct pnp_card *card)
 233 {
 234         int error;
 235         struct list_head *pos, *temp;
 236
 237         card->dev.bus = NULL;
 238         card->dev.release = &pnp_release_card;
 239         error = device_register(&card->dev);
 240         if (error) {
 241                 dev_err(&card->dev, "could not register (err=%d)\n", error);
 242                 return error;
 243         }
 244
 245         pnp_interface_attach_card(card);
 246         spin_lock(&pnp_lock);
 247         list_add_tail(&card->global_list, &pnp_cards);
 248         list_add_tail(&card->protocol_list, &card->protocol->cards);
 249         spin_unlock(&pnp_lock);
 250
 251         /* we wait until now to add devices in order to ensure the drivers
 252          * will be able to use all of the related devices on the card
 253          * without waiting an unreasonable length of time */
 254         list_for_each(pos, &card->devices) {
 255                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 256                 __pnp_add_device(dev);
 257         }
 258
 259         /* match with card drivers */
 260         list_for_each_safe(pos, temp, &pnp_card_drivers) {
 261                 struct pnp_card_driver *drv =
 262                     list_entry(pos, struct pnp_card_driver,
 263                                global_list);
 264                 card_probe(card, drv);
 265         }
 266         return 0;
 267 }
 268
 269 /**
 270  * pnp_remove_card - removes a PnP card from the PnP Layer
 271  * @card: pointer to the card to remove
 272  */
 273 void pnp_remove_card(struct pnp_card *card)
 274 {
 275         struct list_head *pos, *temp;
 276
 277         device_unregister(&card->dev);
 278         spin_lock(&pnp_lock);
 279         list_del(&card->global_list);
 280         list_del(&card->protocol_list);
 281         spin_unlock(&pnp_lock);
 282         list_for_each_safe(pos, temp, &card->devices) {
 283                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 284                 pnp_remove_card_device(dev);
 285         }
 286 }
 287
 288 /**
 289  * pnp_add_card_device - adds a device to the specified card
 290  * @card: pointer to the card to add to
 291  * @dev: pointer to the device to add
 292  */
 293 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
 294 {
 295         dev->dev.parent = &card->dev;
 296         dev->card_link = NULL;
 297         dev_set_name(&dev->dev, "%02x:%02x.%02x",
 298                      dev->protocol->number, card->number, dev->number);
 299         spin_lock(&pnp_lock);
 300         dev->card = card;
 301         list_add_tail(&dev->card_list, &card->devices);
 302         spin_unlock(&pnp_lock);
 303         return 0;
 304 }
 305
 306 /**
 307  * pnp_remove_card_device- removes a device from the specified card
 308  * @dev: pointer to the device to remove
 309  */
 310 void pnp_remove_card_device(struct pnp_dev *dev)
 311 {
 312         spin_lock(&pnp_lock);
 313         dev->card = NULL;
 314         list_del(&dev->card_list);
 315         spin_unlock(&pnp_lock);
 316         __pnp_remove_device(dev);
 317 }
 318
 319 /**
 320  * pnp_request_card_device - Searches for a PnP device under the specified card
 321  * @clink: pointer to the card link, cannot be NULL
 322  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 323  * @from: Starting place to search from. If NULL it will start from the begining.
 324  */
 325 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
 326                                         const char *id, struct pnp_dev *from)
 327 {
 328         struct list_head *pos;
 329         struct pnp_dev *dev;
 330         struct pnp_card_driver *drv;
 331         struct pnp_card *card;
 332
 333         if (!clink || !id)
 334                 return NULL;
 335
 336         card = clink->card;
 337         drv = clink->driver;
 338         if (!from) {
 339                 pos = card->devices.next;
 340         } else {
 341                 if (from->card != card)
 342                         return NULL;
 343                 pos = from->card_list.next;
 344         }
 345         while (pos != &card->devices) {
 346                 dev = card_to_pnp_dev(pos);
 347                 if ((!dev->card_link) && compare_pnp_id(dev->id, id))
 348                         goto found;
 349                 pos = pos->next;
 350         }
 351
 352         return NULL;
 353
 354 found:
 355         dev->card_link = clink;
 356         dev->dev.driver = &drv->link.driver;
 357         if (pnp_bus_type.probe(&dev->dev))
 358                 goto err_out;
 359         if (device_bind_driver(&dev->dev))
 360                 goto err_out;
 361
 362         return dev;
 363
 364 err_out:
 365         dev->dev.driver = NULL;
 366         dev->card_link = NULL;
 367         return NULL;
 368 }
 369
 370 /**
 371  * pnp_release_card_device - call this when the driver no longer needs the device
 372  * @dev: pointer to the PnP device stucture
 373  */
 374 void pnp_release_card_device(struct pnp_dev *dev)
 375 {
 376         struct pnp_card_driver *drv = dev->card_link->driver;
 377
 378         drv->link.remove = &card_remove;
 379         device_release_driver(&dev->dev);
 380         drv->link.remove = &card_remove_first;
 381 }
 382
 383 /*
 384  * suspend/resume callbacks
 385  */
 386 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
 387 {
 388         struct pnp_card_link *link = dev->card_link;
 389
 390         if (link->pm_state.event == state.event)
 391                 return 0;
 392         link->pm_state = state;
 393         return link->driver->suspend(link, state);
 394 }
 395
 396 static int card_resume(struct pnp_dev *dev)
 397 {
 398         struct pnp_card_link *link = dev->card_link;
 399
 400         if (link->pm_state.event == PM_EVENT_ON)
 401                 return 0;
 402         link->pm_state = PMSG_ON;
 403         link->driver->resume(link);
 404         return 0;
 405 }
 406
 407 /**
 408  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 409  * @drv: pointer to the driver to register
 410  */
 411 int pnp_register_card_driver(struct pnp_card_driver *drv)
 412 {
 413         int error;
 414         struct list_head *pos, *temp;
 415
 416         drv->link.name = drv->name;
 417         drv->link.id_table = NULL;      /* this will disable auto matching */
 418         drv->link.flags = drv->flags;
 419         drv->link.probe = NULL;
 420         drv->link.remove = &card_remove_first;
 421         drv->link.suspend = drv->suspend ? card_suspend : NULL;
 422         drv->link.resume = drv->resume ? card_resume : NULL;
 423
 424         error = pnp_register_driver(&drv->link);
 425         if (error < 0)
 426                 return error;
 427
 428         spin_lock(&pnp_lock);
 429         list_add_tail(&drv->global_list, &pnp_card_drivers);
 430         spin_unlock(&pnp_lock);
 431
 432         list_for_each_safe(pos, temp, &pnp_cards) {
 433                 struct pnp_card *card =
 434                     list_entry(pos, struct pnp_card, global_list);
 435                 card_probe(card, drv);
 436         }
 437         return 0;
 438 }
 439
 440 /**
 441  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 442  * @drv: pointer to the driver to unregister
 443  */
 444 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
 445 {
 446         spin_lock(&pnp_lock);
 447         list_del(&drv->global_list);
 448         spin_unlock(&pnp_lock);
 449         pnp_unregister_driver(&drv->link);
 450 }
 451
 452 EXPORT_SYMBOL(pnp_request_card_device);
 453 EXPORT_SYMBOL(pnp_release_card_device);
 454 EXPORT_SYMBOL(pnp_register_card_driver);
 455 EXPORT_SYMBOL(pnp_unregister_card_driver);