linux/drivers/pnp/card.c
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   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
  14LIST_HEAD(pnp_cards);
  15static LIST_HEAD(pnp_card_drivers);
  16
  17static 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
  51static void card_remove(struct pnp_dev *dev)
  52{
  53        dev->card_link = NULL;
  54}
  55
  56static 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
  69static 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 */
 105static 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
 134static 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
 147static 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
 155struct 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
 183static 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
 193static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
 194
 195static 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
 209static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
 210
 211static 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
 224err_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 */
 233int 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 */
 274void 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 */
 294int 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 */
 311void 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 */
 326struct 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
 355found:
 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
 365err_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 */
 375void 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 */
 387static 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
 397static 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 */
 412int 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 */
 445void 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
 453EXPORT_SYMBOL(pnp_request_card_device);
 454EXPORT_SYMBOL(pnp_release_card_device);
 455EXPORT_SYMBOL(pnp_register_card_driver);
 456EXPORT_SYMBOL(pnp_unregister_card_driver);
 457