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         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
 169                 card->number);
 170
 171         card->dev.coherent_dma_mask = DMA_24BIT_MASK;
 172         card->dev.dma_mask = &card->dev.coherent_dma_mask;
 173
 174         dev_id = pnp_add_card_id(card, pnpid);
 175         if (!dev_id) {
 176                 kfree(card);
 177                 return NULL;
 178         }
 179
 180         return card;
 181 }
 182
 183 static ssize_t pnp_show_card_name(struct device *dmdev,
 184                                   struct device_attribute *attr, char *buf)
 185 {
 186         char *str = buf;
 187         struct pnp_card *card = to_pnp_card(dmdev);
 188
 189         str += sprintf(str, "%s\n", card->name);
 190         return (str - buf);
 191 }
 192
 193 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
 194
 195 static ssize_t pnp_show_card_ids(struct device *dmdev,
 196                                  struct device_attribute *attr, char *buf)
 197 {
 198         char *str = buf;
 199         struct pnp_card *card = to_pnp_card(dmdev);
 200         struct pnp_id *pos = card->id;
 201
 202         while (pos) {
 203                 str += sprintf(str, "%s\n", pos->id);
 204                 pos = pos->next;
 205         }
 206         return (str - buf);
 207 }
 208
 209 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
 210
 211 static int pnp_interface_attach_card(struct pnp_card *card)
 212 {
 213         int rc = device_create_file(&card->dev, &dev_attr_name);
 214
 215         if (rc)
 216                 return rc;
 217
 218         rc = device_create_file(&card->dev, &dev_attr_card_id);
 219         if (rc)
 220                 goto err_name;
 221
 222         return 0;
 223
 224 err_name:
 225         device_remove_file(&card->dev, &dev_attr_name);
 226         return rc;
 227 }
 228
 229 /**
 230  * pnp_add_card - adds a PnP card to the PnP Layer
 231  * @card: pointer to the card to add
 232  */
 233 int pnp_add_card(struct pnp_card *card)
 234 {
 235         int error;
 236         struct list_head *pos, *temp;
 237
 238         card->dev.bus = NULL;
 239         card->dev.release = &pnp_release_card;
 240         error = device_register(&card->dev);
 241         if (error) {
 242                 dev_err(&card->dev, "could not register (err=%d)\n", error);
 243                 return error;
 244         }
 245
 246         pnp_interface_attach_card(card);
 247         spin_lock(&pnp_lock);
 248         list_add_tail(&card->global_list, &pnp_cards);
 249         list_add_tail(&card->protocol_list, &card->protocol->cards);
 250         spin_unlock(&pnp_lock);
 251
 252         /* we wait until now to add devices in order to ensure the drivers
 253          * will be able to use all of the related devices on the card
 254          * without waiting an unreasonable length of time */
 255         list_for_each(pos, &card->devices) {
 256                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 257                 __pnp_add_device(dev);
 258         }
 259
 260         /* match with card drivers */
 261         list_for_each_safe(pos, temp, &pnp_card_drivers) {
 262                 struct pnp_card_driver *drv =
 263                     list_entry(pos, struct pnp_card_driver,
 264                                global_list);
 265                 card_probe(card, drv);
 266         }
 267         return 0;
 268 }
 269
 270 /**
 271  * pnp_remove_card - removes a PnP card from the PnP Layer
 272  * @card: pointer to the card to remove
 273  */
 274 void pnp_remove_card(struct pnp_card *card)
 275 {
 276         struct list_head *pos, *temp;
 277
 278         device_unregister(&card->dev);
 279         spin_lock(&pnp_lock);
 280         list_del(&card->global_list);
 281         list_del(&card->protocol_list);
 282         spin_unlock(&pnp_lock);
 283         list_for_each_safe(pos, temp, &card->devices) {
 284                 struct pnp_dev *dev = card_to_pnp_dev(pos);
 285                 pnp_remove_card_device(dev);
 286         }
 287 }
 288
 289 /**
 290  * pnp_add_card_device - adds a device to the specified card
 291  * @card: pointer to the card to add to
 292  * @dev: pointer to the device to add
 293  */
 294 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
 295 {
 296         dev->dev.parent = &card->dev;
 297         dev->card_link = NULL;
 298         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
 299                  dev->protocol->number, card->number, dev->number);
 300         spin_lock(&pnp_lock);
 301         dev->card = card;
 302         list_add_tail(&dev->card_list, &card->devices);
 303         spin_unlock(&pnp_lock);
 304         return 0;
 305 }
 306
 307 /**
 308  * pnp_remove_card_device- removes a device from the specified card
 309  * @dev: pointer to the device to remove
 310  */
 311 void pnp_remove_card_device(struct pnp_dev *dev)
 312 {
 313         spin_lock(&pnp_lock);
 314         dev->card = NULL;
 315         list_del(&dev->card_list);
 316         spin_unlock(&pnp_lock);
 317         __pnp_remove_device(dev);
 318 }
 319
 320 /**
 321  * pnp_request_card_device - Searches for a PnP device under the specified card
 322  * @clink: pointer to the card link, cannot be NULL
 323  * @id: pointer to a PnP ID structure that explains the rules for finding the device
 324  * @from: Starting place to search from. If NULL it will start from the begining.
 325  */
 326 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
 327                                         const char *id, struct pnp_dev *from)
 328 {
 329         struct list_head *pos;
 330         struct pnp_dev *dev;
 331         struct pnp_card_driver *drv;
 332         struct pnp_card *card;
 333
 334         if (!clink || !id)
 335                 return NULL;
 336
 337         card = clink->card;
 338         drv = clink->driver;
 339         if (!from) {
 340                 pos = card->devices.next;
 341         } else {
 342                 if (from->card != card)
 343                         return NULL;
 344                 pos = from->card_list.next;
 345         }
 346         while (pos != &card->devices) {
 347                 dev = card_to_pnp_dev(pos);
 348                 if ((!dev->card_link) && compare_pnp_id(dev->id, id))
 349                         goto found;
 350                 pos = pos->next;
 351         }
 352
 353         return NULL;
 354
 355 found:
 356         dev->card_link = clink;
 357         dev->dev.driver = &drv->link.driver;
 358         if (pnp_bus_type.probe(&dev->dev))
 359                 goto err_out;
 360         if (device_bind_driver(&dev->dev))
 361                 goto err_out;
 362
 363         return dev;
 364
 365 err_out:
 366         dev->dev.driver = NULL;
 367         dev->card_link = NULL;
 368         return NULL;
 369 }
 370
 371 /**
 372  * pnp_release_card_device - call this when the driver no longer needs the device
 373  * @dev: pointer to the PnP device stucture
 374  */
 375 void pnp_release_card_device(struct pnp_dev *dev)
 376 {
 377         struct pnp_card_driver *drv = dev->card_link->driver;
 378
 379         drv->link.remove = &card_remove;
 380         device_release_driver(&dev->dev);
 381         drv->link.remove = &card_remove_first;
 382 }
 383
 384 /*
 385  * suspend/resume callbacks
 386  */
 387 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
 388 {
 389         struct pnp_card_link *link = dev->card_link;
 390
 391         if (link->pm_state.event == state.event)
 392                 return 0;
 393         link->pm_state = state;
 394         return link->driver->suspend(link, state);
 395 }
 396
 397 static int card_resume(struct pnp_dev *dev)
 398 {
 399         struct pnp_card_link *link = dev->card_link;
 400
 401         if (link->pm_state.event == PM_EVENT_ON)
 402                 return 0;
 403         link->pm_state = PMSG_ON;
 404         link->driver->resume(link);
 405         return 0;
 406 }
 407
 408 /**
 409  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
 410  * @drv: pointer to the driver to register
 411  */
 412 int pnp_register_card_driver(struct pnp_card_driver *drv)
 413 {
 414         int error;
 415         struct list_head *pos, *temp;
 416
 417         drv->link.name = drv->name;
 418         drv->link.id_table = NULL;      /* this will disable auto matching */
 419         drv->link.flags = drv->flags;
 420         drv->link.probe = NULL;
 421         drv->link.remove = &card_remove_first;
 422         drv->link.suspend = drv->suspend ? card_suspend : NULL;
 423         drv->link.resume = drv->resume ? card_resume : NULL;
 424
 425         error = pnp_register_driver(&drv->link);
 426         if (error < 0)
 427                 return error;
 428
 429         spin_lock(&pnp_lock);
 430         list_add_tail(&drv->global_list, &pnp_card_drivers);
 431         spin_unlock(&pnp_lock);
 432
 433         list_for_each_safe(pos, temp, &pnp_cards) {
 434                 struct pnp_card *card =
 435                     list_entry(pos, struct pnp_card, global_list);
 436                 card_probe(card, drv);
 437         }
 438         return 0;
 439 }
 440
 441 /**
 442  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
 443  * @drv: pointer to the driver to unregister
 444  */
 445 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
 446 {
 447         spin_lock(&pnp_lock);
 448         list_del(&drv->global_list);
 449         spin_unlock(&pnp_lock);
 450         pnp_unregister_driver(&drv->link);
 451 }
 452
 453 EXPORT_SYMBOL(pnp_request_card_device);
 454 EXPORT_SYMBOL(pnp_release_card_device);
 455 EXPORT_SYMBOL(pnp_register_card_driver);
 456 EXPORT_SYMBOL(pnp_unregister_card_driver);