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