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1// SPDX-License-Identifier: GPL-2.02/*3 * card.c - contains functions for managing groups of PnP devices4 *5 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>6 */7 8#include <linux/module.h>9#include <linux/mutex.h>10#include <linux/ctype.h>11#include <linux/slab.h>12#include <linux/pnp.h>13#include <linux/dma-mapping.h>14#include "base.h"15 16LIST_HEAD(pnp_cards);17static LIST_HEAD(pnp_card_drivers);18 19static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,20 struct pnp_card *card)21{22 const struct pnp_card_device_id *drv_id = drv->id_table;23 24 while (*drv_id->id) {25 if (compare_pnp_id(card->id, drv_id->id)) {26 int i = 0;27 28 for (;;) {29 int found;30 struct pnp_dev *dev;31 32 if (i == PNP_MAX_DEVICES ||33 !*drv_id->devs[i].id)34 return drv_id;35 found = 0;36 card_for_each_dev(card, dev) {37 if (compare_pnp_id(dev->id,38 drv_id->devs[i].id)) {39 found = 1;40 break;41 }42 }43 if (!found)44 break;45 i++;46 }47 }48 drv_id++;49 }50 return NULL;51}52 53static void card_remove(struct pnp_dev *dev)54{55 dev->card_link = NULL;56}57 58static void card_remove_first(struct pnp_dev *dev)59{60 struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);61 62 if (!dev->card || !drv)63 return;64 if (drv->remove)65 drv->remove(dev->card_link);66 drv->link.remove = &card_remove;67 kfree(dev->card_link);68 card_remove(dev);69}70 71static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)72{73 const struct pnp_card_device_id *id;74 struct pnp_card_link *clink;75 struct pnp_dev *dev;76 77 if (!drv->probe)78 return 0;79 id = match_card(drv, card);80 if (!id)81 return 0;82 83 clink = kzalloc(sizeof(*clink), GFP_KERNEL);84 if (!clink)85 return 0;86 clink->card = card;87 clink->driver = drv;88 clink->pm_state = PMSG_ON;89 90 if (drv->probe(clink, id) >= 0)91 return 1;92 93 /* Recovery */94 card_for_each_dev(card, dev) {95 if (dev->card_link == clink)96 pnp_release_card_device(dev);97 }98 kfree(clink);99 return 0;100}101 102/**103 * pnp_add_card_id - adds an EISA id to the specified card104 * @id: pointer to a pnp_id structure105 * @card: pointer to the desired card106 */107static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)108{109 struct pnp_id *dev_id, *ptr;110 111 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);112 if (!dev_id)113 return NULL;114 115 dev_id->id[0] = id[0];116 dev_id->id[1] = id[1];117 dev_id->id[2] = id[2];118 dev_id->id[3] = tolower(id[3]);119 dev_id->id[4] = tolower(id[4]);120 dev_id->id[5] = tolower(id[5]);121 dev_id->id[6] = tolower(id[6]);122 dev_id->id[7] = '\0';123 124 dev_id->next = NULL;125 ptr = card->id;126 while (ptr && ptr->next)127 ptr = ptr->next;128 if (ptr)129 ptr->next = dev_id;130 else131 card->id = dev_id;132 133 return dev_id;134}135 136static void pnp_free_card_ids(struct pnp_card *card)137{138 struct pnp_id *id;139 struct pnp_id *next;140 141 id = card->id;142 while (id) {143 next = id->next;144 kfree(id);145 id = next;146 }147}148 149static void pnp_release_card(struct device *dmdev)150{151 struct pnp_card *card = to_pnp_card(dmdev);152 153 pnp_free_card_ids(card);154 kfree(card);155}156 157struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)158{159 struct pnp_card *card;160 struct pnp_id *dev_id;161 162 card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);163 if (!card)164 return NULL;165 166 card->protocol = protocol;167 card->number = id;168 169 card->dev.parent = &card->protocol->dev;170 dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);171 172 card->dev.coherent_dma_mask = DMA_BIT_MASK(24);173 card->dev.dma_mask = &card->dev.coherent_dma_mask;174 175 dev_id = pnp_add_card_id(card, pnpid);176 if (!dev_id) {177 kfree(card);178 return NULL;179 }180 181 return card;182}183 184static ssize_t name_show(struct device *dmdev,185 struct device_attribute *attr, char *buf)186{187 char *str = buf;188 struct pnp_card *card = to_pnp_card(dmdev);189 190 str += sprintf(str, "%s\n", card->name);191 return (str - buf);192}193 194static DEVICE_ATTR_RO(name);195 196static ssize_t card_id_show(struct device *dmdev,197 struct device_attribute *attr, char *buf)198{199 char *str = buf;200 struct pnp_card *card = to_pnp_card(dmdev);201 struct pnp_id *pos = card->id;202 203 while (pos) {204 str += sprintf(str, "%s\n", pos->id);205 pos = pos->next;206 }207 return (str - buf);208}209 210static DEVICE_ATTR_RO(card_id);211 212static int pnp_interface_attach_card(struct pnp_card *card)213{214 int rc = device_create_file(&card->dev, &dev_attr_name);215 216 if (rc)217 return rc;218 219 rc = device_create_file(&card->dev, &dev_attr_card_id);220 if (rc)221 goto err_name;222 223 return 0;224 225err_name:226 device_remove_file(&card->dev, &dev_attr_name);227 return rc;228}229 230/**231 * pnp_add_card - adds a PnP card to the PnP Layer232 * @card: pointer to the card to add233 */234int pnp_add_card(struct pnp_card *card)235{236 int error;237 struct list_head *pos, *temp;238 239 card->dev.bus = NULL;240 card->dev.release = &pnp_release_card;241 error = device_register(&card->dev);242 if (error) {243 dev_err(&card->dev, "could not register (err=%d)\n", error);244 put_device(&card->dev);245 return error;246 }247 248 pnp_interface_attach_card(card);249 mutex_lock(&pnp_lock);250 list_add_tail(&card->global_list, &pnp_cards);251 list_add_tail(&card->protocol_list, &card->protocol->cards);252 mutex_unlock(&pnp_lock);253 254 /* we wait until now to add devices in order to ensure the drivers255 * will be able to use all of the related devices on the card256 * without waiting an unreasonable length of time */257 list_for_each(pos, &card->devices) {258 struct pnp_dev *dev = card_to_pnp_dev(pos);259 __pnp_add_device(dev);260 }261 262 /* match with card drivers */263 list_for_each_safe(pos, temp, &pnp_card_drivers) {264 struct pnp_card_driver *drv =265 list_entry(pos, struct pnp_card_driver,266 global_list);267 card_probe(card, drv);268 }269 return 0;270}271 272/**273 * pnp_remove_card - removes a PnP card from the PnP Layer274 * @card: pointer to the card to remove275 */276void pnp_remove_card(struct pnp_card *card)277{278 struct list_head *pos, *temp;279 280 device_unregister(&card->dev);281 mutex_lock(&pnp_lock);282 list_del(&card->global_list);283 list_del(&card->protocol_list);284 mutex_unlock(&pnp_lock);285 list_for_each_safe(pos, temp, &card->devices) {286 struct pnp_dev *dev = card_to_pnp_dev(pos);287 pnp_remove_card_device(dev);288 }289}290 291/**292 * pnp_add_card_device - adds a device to the specified card293 * @card: pointer to the card to add to294 * @dev: pointer to the device to add295 */296int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)297{298 dev->dev.parent = &card->dev;299 dev->card_link = NULL;300 dev_set_name(&dev->dev, "%02x:%02x.%02x",301 dev->protocol->number, card->number, dev->number);302 mutex_lock(&pnp_lock);303 dev->card = card;304 list_add_tail(&dev->card_list, &card->devices);305 mutex_unlock(&pnp_lock);306 return 0;307}308 309/**310 * pnp_remove_card_device- removes a device from the specified card311 * @dev: pointer to the device to remove312 */313void pnp_remove_card_device(struct pnp_dev *dev)314{315 mutex_lock(&pnp_lock);316 dev->card = NULL;317 list_del(&dev->card_list);318 mutex_unlock(&pnp_lock);319 __pnp_remove_device(dev);320}321 322/**323 * pnp_request_card_device - Searches for a PnP device under the specified card324 * @clink: pointer to the card link, cannot be NULL325 * @id: pointer to a PnP ID structure that explains the rules for finding the device326 * @from: Starting place to search from. If NULL it will start from the beginning.327 */328struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,329 const char *id, struct pnp_dev *from)330{331 struct list_head *pos;332 struct pnp_dev *dev;333 struct pnp_card_driver *drv;334 struct pnp_card *card;335 336 if (!clink || !id)337 return NULL;338 339 card = clink->card;340 drv = clink->driver;341 if (!from) {342 pos = card->devices.next;343 } else {344 if (from->card != card)345 return NULL;346 pos = from->card_list.next;347 }348 while (pos != &card->devices) {349 dev = card_to_pnp_dev(pos);350 if ((!dev->card_link) && compare_pnp_id(dev->id, id))351 goto found;352 pos = pos->next;353 }354 355 return NULL;356 357found:358 dev->card_link = clink;359 dev->dev.driver = &drv->link.driver;360 if (pnp_bus_type.probe(&dev->dev))361 goto err_out;362 if (device_bind_driver(&dev->dev))363 goto err_out;364 365 return dev;366 367err_out:368 dev->dev.driver = NULL;369 dev->card_link = NULL;370 return NULL;371}372EXPORT_SYMBOL(pnp_request_card_device);373 374/**375 * pnp_release_card_device - call this when the driver no longer needs the device376 * @dev: pointer to the PnP device structure377 */378void pnp_release_card_device(struct pnp_dev *dev)379{380 struct pnp_card_driver *drv = dev->card_link->driver;381 382 drv->link.remove = &card_remove;383 device_release_driver(&dev->dev);384 drv->link.remove = &card_remove_first;385}386EXPORT_SYMBOL(pnp_release_card_device);387 388/*389 * suspend/resume callbacks390 */391static int card_suspend(struct pnp_dev *dev, pm_message_t state)392{393 struct pnp_card_link *link = dev->card_link;394 395 if (link->pm_state.event == state.event)396 return 0;397 link->pm_state = state;398 return link->driver->suspend(link, state);399}400 401static int card_resume(struct pnp_dev *dev)402{403 struct pnp_card_link *link = dev->card_link;404 405 if (link->pm_state.event == PM_EVENT_ON)406 return 0;407 link->pm_state = PMSG_ON;408 link->driver->resume(link);409 return 0;410}411 412/**413 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer414 * @drv: pointer to the driver to register415 */416int pnp_register_card_driver(struct pnp_card_driver *drv)417{418 int error;419 struct list_head *pos, *temp;420 421 drv->link.name = drv->name;422 drv->link.id_table = NULL; /* this will disable auto matching */423 drv->link.flags = drv->flags;424 drv->link.probe = NULL;425 drv->link.remove = &card_remove_first;426 drv->link.suspend = drv->suspend ? card_suspend : NULL;427 drv->link.resume = drv->resume ? card_resume : NULL;428 429 error = pnp_register_driver(&drv->link);430 if (error < 0)431 return error;432 433 mutex_lock(&pnp_lock);434 list_add_tail(&drv->global_list, &pnp_card_drivers);435 mutex_unlock(&pnp_lock);436 437 list_for_each_safe(pos, temp, &pnp_cards) {438 struct pnp_card *card =439 list_entry(pos, struct pnp_card, global_list);440 card_probe(card, drv);441 }442 return 0;443}444EXPORT_SYMBOL(pnp_register_card_driver);445 446/**447 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer448 * @drv: pointer to the driver to unregister449 */450void pnp_unregister_card_driver(struct pnp_card_driver *drv)451{452 mutex_lock(&pnp_lock);453 list_del(&drv->global_list);454 mutex_unlock(&pnp_lock);455 pnp_unregister_driver(&drv->link);456}457EXPORT_SYMBOL(pnp_unregister_card_driver);458