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; 66 struct pnp_card_link *clink; 67 struct pnp_dev *dev; 68 69 if (!drv->probe) 70 return 0; 71 id = match_card(drv,card); 72 if (!id) 73 return 0; 74 75 clink = pnp_alloc(sizeof(*clink)); 76 if (!clink) 77 return 0; 78 clink->card = card; 79 clink->driver = drv; 80 clink->pm_state = PMSG_ON; 81 82 if (drv->probe(clink, id) >= 0) 83 return 1; 84 85 /* Recovery */ 86 card_for_each_dev(card, dev) { 87 if (dev->card_link == clink) 88 pnp_release_card_device(dev); 89 } 90 kfree(clink); 91 return 0; 92 } 93 94 /** 95 * pnp_add_card_id - adds an EISA id to the specified card 96 * @id: pointer to a pnp_id structure 97 * @card: pointer to the desired card 98 * 99 */ 100 101 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card) 102 { 103 struct pnp_id * ptr; 104 if (!id) 105 return -EINVAL; 106 if (!card) 107 return -EINVAL; 108 id->next = NULL; 109 ptr = card->id; 110 while (ptr && ptr->next) 111 ptr = ptr->next; 112 if (ptr) 113 ptr->next = id; 114 else 115 card->id = id; 116 return 0; 117 } 118 119 static void pnp_free_card_ids(struct pnp_card * card) 120 { 121 struct pnp_id * id; 122 struct pnp_id *next; 123 if (!card) 124 return; 125 id = card->id; 126 while (id) { 127 next = id->next; 128 kfree(id); 129 id = next; 130 } 131 } 132 133 static void pnp_release_card(struct device *dmdev) 134 { 135 struct pnp_card * card = to_pnp_card(dmdev); 136 pnp_free_card_ids(card); 137 kfree(card); 138 } 139 140 141 static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) 142 { 143 char *str = buf; 144 struct pnp_card *card = to_pnp_card(dmdev); 145 str += sprintf(str,"%s\n", card->name); 146 return (str - buf); 147 } 148 149 static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL); 150 151 static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) 152 { 153 char *str = buf; 154 struct pnp_card *card = to_pnp_card(dmdev); 155 struct pnp_id * pos = card->id; 156 157 while (pos) { 158 str += sprintf(str,"%s\n", pos->id); 159 pos = pos->next; 160 } 161 return (str - buf); 162 } 163 164 static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL); 165 166 static int pnp_interface_attach_card(struct pnp_card *card) 167 { 168 device_create_file(&card->dev,&dev_attr_name); 169 device_create_file(&card->dev,&dev_attr_card_id); 170 return 0; 171 } 172 173 /** 174 * pnp_add_card - adds a PnP card to the PnP Layer 175 * @card: pointer to the card to add 176 */ 177 178 int pnp_add_card(struct pnp_card * card) 179 { 180 int error; 181 struct list_head * pos, * temp; 182 if (!card || !card->protocol) 183 return -EINVAL; 184 185 sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); 186 card->dev.parent = &card->protocol->dev; 187 card->dev.bus = NULL; 188 card->dev.release = &pnp_release_card; 189 error = device_register(&card->dev); 190 191 if (error == 0) { 192 pnp_interface_attach_card(card); 193 spin_lock(&pnp_lock); 194 list_add_tail(&card->global_list, &pnp_cards); 195 list_add_tail(&card->protocol_list, &card->protocol->cards); 196 spin_unlock(&pnp_lock); 197 198 /* we wait until now to add devices in order to ensure the drivers 199 * will be able to use all of the related devices on the card 200 * without waiting any unresonable length of time */ 201 list_for_each(pos,&card->devices){ 202 struct pnp_dev *dev = card_to_pnp_dev(pos); 203 __pnp_add_device(dev); 204 } 205 206 /* match with card drivers */ 207 list_for_each_safe(pos,temp,&pnp_card_drivers){ 208 struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); 209 card_probe(card,drv); 210 } 211 } else 212 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); 213 return error; 214 } 215 216 /** 217 * pnp_remove_card - removes a PnP card from the PnP Layer 218 * @card: pointer to the card to remove 219 */ 220 221 void pnp_remove_card(struct pnp_card * card) 222 { 223 struct list_head *pos, *temp; 224 if (!card) 225 return; 226 device_unregister(&card->dev); 227 spin_lock(&pnp_lock); 228 list_del(&card->global_list); 229 list_del(&card->protocol_list); 230 spin_unlock(&pnp_lock); 231 list_for_each_safe(pos,temp,&card->devices){ 232 struct pnp_dev *dev = card_to_pnp_dev(pos); 233 pnp_remove_card_device(dev); 234 } 235 } 236 237 /** 238 * pnp_add_card_device - adds a device to the specified card 239 * @card: pointer to the card to add to 240 * @dev: pointer to the device to add 241 */ 242 243 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) 244 { 245 if (!card || !dev || !dev->protocol) 246 return -EINVAL; 247 dev->dev.parent = &card->dev; 248 dev->card_link = NULL; 249 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, 250 card->number,dev->number); 251 spin_lock(&pnp_lock); 252 dev->card = card; 253 list_add_tail(&dev->card_list, &card->devices); 254 spin_unlock(&pnp_lock); 255 return 0; 256 } 257 258 /** 259 * pnp_remove_card_device- removes a device from the specified card 260 * @dev: pointer to the device to remove 261 */ 262 263 void pnp_remove_card_device(struct pnp_dev * dev) 264 { 265 spin_lock(&pnp_lock); 266 dev->card = NULL; 267 list_del(&dev->card_list); 268 spin_unlock(&pnp_lock); 269 __pnp_remove_device(dev); 270 } 271 272 /** 273 * pnp_request_card_device - Searches for a PnP device under the specified card 274 * @clink: pointer to the card link, cannot be NULL 275 * @id: pointer to a PnP ID structure that explains the rules for finding the device 276 * @from: Starting place to search from. If NULL it will start from the begining. 277 */ 278 279 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) 280 { 281 struct list_head * pos; 282 struct pnp_dev * dev; 283 struct pnp_card_driver * drv; 284 struct pnp_card * card; 285 if (!clink || !id) 286 goto done; 287 card = clink->card; 288 drv = clink->driver; 289 if (!from) { 290 pos = card->devices.next; 291 } else { 292 if (from->card != card) 293 goto done; 294 pos = from->card_list.next; 295 } 296 while (pos != &card->devices) { 297 dev = card_to_pnp_dev(pos); 298 if ((!dev->card_link) && compare_pnp_id(dev->id,id)) 299 goto found; 300 pos = pos->next; 301 } 302 303 done: 304 return NULL; 305 306 found: 307 down_write(&dev->dev.bus->subsys.rwsem); 308 dev->card_link = clink; 309 dev->dev.driver = &drv->link.driver; 310 if (pnp_bus_type.probe(&dev->dev)) { 311 dev->dev.driver = NULL; 312 dev->card_link = NULL; 313 up_write(&dev->dev.bus->subsys.rwsem); 314 return NULL; 315 } 316 device_bind_driver(&dev->dev); 317 up_write(&dev->dev.bus->subsys.rwsem); 318 319 return dev; 320 } 321 322 /** 323 * pnp_release_card_device - call this when the driver no longer needs the device 324 * @dev: pointer to the PnP device stucture 325 */ 326 327 void pnp_release_card_device(struct pnp_dev * dev) 328 { 329 struct pnp_card_driver * drv = dev->card_link->driver; 330 if (!drv) 331 return; 332 down_write(&dev->dev.bus->subsys.rwsem); 333 drv->link.remove = &card_remove; 334 device_release_driver(&dev->dev); 335 drv->link.remove = &card_remove_first; 336 up_write(&dev->dev.bus->subsys.rwsem); 337 } 338 339 /* 340 * suspend/resume callbacks 341 */ 342 static int card_suspend(struct pnp_dev *dev, pm_message_t state) 343 { 344 struct pnp_card_link *link = dev->card_link; 345 if (link->pm_state.event == state.event) 346 return 0; 347 link->pm_state = state; 348 return link->driver->suspend(link, state); 349 } 350 351 static int card_resume(struct pnp_dev *dev) 352 { 353 struct pnp_card_link *link = dev->card_link; 354 if (link->pm_state.event == PM_EVENT_ON) 355 return 0; 356 link->pm_state = PMSG_ON; 357 link->driver->resume(link); 358 return 0; 359 } 360 361 /** 362 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer 363 * @drv: pointer to the driver to register 364 */ 365 366 int pnp_register_card_driver(struct pnp_card_driver * drv) 367 { 368 int error; 369 struct list_head *pos, *temp; 370 371 drv->link.name = drv->name; 372 drv->link.id_table = NULL; /* this will disable auto matching */ 373 drv->link.flags = drv->flags; 374 drv->link.probe = NULL; 375 drv->link.remove = &card_remove_first; 376 drv->link.suspend = drv->suspend ? card_suspend : NULL; 377 drv->link.resume = drv->resume ? card_resume : NULL; 378 379 error = pnp_register_driver(&drv->link); 380 if (error < 0) 381 return error; 382 383 spin_lock(&pnp_lock); 384 list_add_tail(&drv->global_list, &pnp_card_drivers); 385 spin_unlock(&pnp_lock); 386 387 list_for_each_safe(pos,temp,&pnp_cards){ 388 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); 389 card_probe(card,drv); 390 } 391 return 0; 392 } 393 394 /** 395 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer 396 * @drv: pointer to the driver to unregister 397 */ 398 399 void pnp_unregister_card_driver(struct pnp_card_driver * drv) 400 { 401 spin_lock(&pnp_lock); 402 list_del(&drv->global_list); 403 spin_unlock(&pnp_lock); 404 pnp_unregister_driver(&drv->link); 405 } 406 407 #if 0 408 EXPORT_SYMBOL(pnp_add_card); 409 EXPORT_SYMBOL(pnp_remove_card); 410 EXPORT_SYMBOL(pnp_add_card_device); 411 EXPORT_SYMBOL(pnp_remove_card_device); 412 EXPORT_SYMBOL(pnp_add_card_id); 413 #endif /* 0 */ 414 EXPORT_SYMBOL(pnp_request_card_device); 415 EXPORT_SYMBOL(pnp_release_card_device); 416 EXPORT_SYMBOL(pnp_register_card_driver); 417 EXPORT_SYMBOL(pnp_unregister_card_driver); 418