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/module.h> 9 #include <linux/slab.h> 10 #include <linux/pnp.h> 11 #include "base.h" 12 13 LIST_HEAD(pnp_cards); 14 static LIST_HEAD(pnp_card_drivers); 15 16 17 static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card) 18 { 19 const struct pnp_card_device_id * drv_id = drv->id_table; 20 while (*drv_id->id){ 21 if (compare_pnp_id(card->id,drv_id->id)) { 22 int i = 0; 23 for (;;) { 24 int found; 25 struct pnp_dev *dev; 26 if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id) 27 return drv_id; 28 found = 0; 29 card_for_each_dev(card, dev) { 30 if (compare_pnp_id(dev->id, drv_id->devs[i].id)) { 31 found = 1; 32 break; 33 } 34 } 35 if (! found) 36 break; 37 i++; 38 } 39 } 40 drv_id++; 41 } 42 return NULL; 43 } 44 45 static void card_remove(struct pnp_dev * dev) 46 { 47 dev->card_link = NULL; 48 } 49 50 static void card_remove_first(struct pnp_dev * dev) 51 { 52 struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver); 53 if (!dev->card || !drv) 54 return; 55 if (drv->remove) 56 drv->remove(dev->card_link); 57 drv->link.remove = &card_remove; 58 kfree(dev->card_link); 59 card_remove(dev); 60 } 61 62 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv) 63 { 64 const struct pnp_card_device_id *id; 65 struct pnp_card_link *clink; 66 struct pnp_dev *dev; 67 68 if (!drv->probe) 69 return 0; 70 id = match_card(drv,card); 71 if (!id) 72 return 0; 73 74 clink = pnp_alloc(sizeof(*clink)); 75 if (!clink) 76 return 0; 77 clink->card = card; 78 clink->driver = drv; 79 clink->pm_state = PMSG_ON; 80 81 if (drv->probe(clink, id) >= 0) 82 return 1; 83 84 /* Recovery */ 85 card_for_each_dev(card, dev) { 86 if (dev->card_link == clink) 87 pnp_release_card_device(dev); 88 } 89 kfree(clink); 90 return 0; 91 } 92 93 /** 94 * pnp_add_card_id - adds an EISA id to the specified card 95 * @id: pointer to a pnp_id structure 96 * @card: pointer to the desired card 97 * 98 */ 99 100 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card) 101 { 102 struct pnp_id * ptr; 103 if (!id) 104 return -EINVAL; 105 if (!card) 106 return -EINVAL; 107 id->next = NULL; 108 ptr = card->id; 109 while (ptr && ptr->next) 110 ptr = ptr->next; 111 if (ptr) 112 ptr->next = id; 113 else 114 card->id = id; 115 return 0; 116 } 117 118 static void pnp_free_card_ids(struct pnp_card * card) 119 { 120 struct pnp_id * id; 121 struct pnp_id *next; 122 if (!card) 123 return; 124 id = card->id; 125 while (id) { 126 next = id->next; 127 kfree(id); 128 id = next; 129 } 130 } 131 132 static void pnp_release_card(struct device *dmdev) 133 { 134 struct pnp_card * card = to_pnp_card(dmdev); 135 pnp_free_card_ids(card); 136 kfree(card); 137 } 138 139 140 static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) 141 { 142 char *str = buf; 143 struct pnp_card *card = to_pnp_card(dmdev); 144 str += sprintf(str,"%s\n", card->name); 145 return (str - buf); 146 } 147 148 static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL); 149 150 static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) 151 { 152 char *str = buf; 153 struct pnp_card *card = to_pnp_card(dmdev); 154 struct pnp_id * pos = card->id; 155 156 while (pos) { 157 str += sprintf(str,"%s\n", pos->id); 158 pos = pos->next; 159 } 160 return (str - buf); 161 } 162 163 static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL); 164 165 static int pnp_interface_attach_card(struct pnp_card *card) 166 { 167 device_create_file(&card->dev,&dev_attr_name); 168 device_create_file(&card->dev,&dev_attr_card_id); 169 return 0; 170 } 171 172 /** 173 * pnp_add_card - adds a PnP card to the PnP Layer 174 * @card: pointer to the card to add 175 */ 176 177 int pnp_add_card(struct pnp_card * card) 178 { 179 int error; 180 struct list_head * pos, * temp; 181 if (!card || !card->protocol) 182 return -EINVAL; 183 184 sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); 185 card->dev.parent = &card->protocol->dev; 186 card->dev.bus = NULL; 187 card->dev.release = &pnp_release_card; 188 error = device_register(&card->dev); 189 190 if (error == 0) { 191 pnp_interface_attach_card(card); 192 spin_lock(&pnp_lock); 193 list_add_tail(&card->global_list, &pnp_cards); 194 list_add_tail(&card->protocol_list, &card->protocol->cards); 195 spin_unlock(&pnp_lock); 196 197 /* we wait until now to add devices in order to ensure the drivers 198 * will be able to use all of the related devices on the card 199 * without waiting any unresonable length of time */ 200 list_for_each(pos,&card->devices){ 201 struct pnp_dev *dev = card_to_pnp_dev(pos); 202 __pnp_add_device(dev); 203 } 204 205 /* match with card drivers */ 206 list_for_each_safe(pos,temp,&pnp_card_drivers){ 207 struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); 208 card_probe(card,drv); 209 } 210 } else 211 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); 212 return error; 213 } 214 215 /** 216 * pnp_remove_card - removes a PnP card from the PnP Layer 217 * @card: pointer to the card to remove 218 */ 219 220 void pnp_remove_card(struct pnp_card * card) 221 { 222 struct list_head *pos, *temp; 223 if (!card) 224 return; 225 device_unregister(&card->dev); 226 spin_lock(&pnp_lock); 227 list_del(&card->global_list); 228 list_del(&card->protocol_list); 229 spin_unlock(&pnp_lock); 230 list_for_each_safe(pos,temp,&card->devices){ 231 struct pnp_dev *dev = card_to_pnp_dev(pos); 232 pnp_remove_card_device(dev); 233 } 234 } 235 236 /** 237 * pnp_add_card_device - adds a device to the specified card 238 * @card: pointer to the card to add to 239 * @dev: pointer to the device to add 240 */ 241 242 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) 243 { 244 if (!card || !dev || !dev->protocol) 245 return -EINVAL; 246 dev->dev.parent = &card->dev; 247 dev->card_link = NULL; 248 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, 249 card->number,dev->number); 250 spin_lock(&pnp_lock); 251 dev->card = card; 252 list_add_tail(&dev->card_list, &card->devices); 253 spin_unlock(&pnp_lock); 254 return 0; 255 } 256 257 /** 258 * pnp_remove_card_device- removes a device from the specified card 259 * @dev: pointer to the device to remove 260 */ 261 262 void pnp_remove_card_device(struct pnp_dev * dev) 263 { 264 spin_lock(&pnp_lock); 265 dev->card = NULL; 266 list_del(&dev->card_list); 267 spin_unlock(&pnp_lock); 268 __pnp_remove_device(dev); 269 } 270 271 /** 272 * pnp_request_card_device - Searches for a PnP device under the specified card 273 * @clink: pointer to the card link, cannot be NULL 274 * @id: pointer to a PnP ID structure that explains the rules for finding the device 275 * @from: Starting place to search from. If NULL it will start from the begining. 276 */ 277 278 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) 279 { 280 struct list_head * pos; 281 struct pnp_dev * dev; 282 struct pnp_card_driver * drv; 283 struct pnp_card * card; 284 if (!clink || !id) 285 goto done; 286 card = clink->card; 287 drv = clink->driver; 288 if (!from) { 289 pos = card->devices.next; 290 } else { 291 if (from->card != card) 292 goto done; 293 pos = from->card_list.next; 294 } 295 while (pos != &card->devices) { 296 dev = card_to_pnp_dev(pos); 297 if ((!dev->card_link) && compare_pnp_id(dev->id,id)) 298 goto found; 299 pos = pos->next; 300 } 301 302 done: 303 return NULL; 304 305 found: 306 down_write(&dev->dev.bus->subsys.rwsem); 307 dev->card_link = clink; 308 dev->dev.driver = &drv->link.driver; 309 if (pnp_bus_type.probe(&dev->dev)) { 310 dev->dev.driver = NULL; 311 dev->card_link = NULL; 312 up_write(&dev->dev.bus->subsys.rwsem); 313 return NULL; 314 } 315 device_bind_driver(&dev->dev); 316 up_write(&dev->dev.bus->subsys.rwsem); 317 318 return dev; 319 } 320 321 /** 322 * pnp_release_card_device - call this when the driver no longer needs the device 323 * @dev: pointer to the PnP device stucture 324 */ 325 326 void pnp_release_card_device(struct pnp_dev * dev) 327 { 328 struct pnp_card_driver * drv = dev->card_link->driver; 329 if (!drv) 330 return; 331 down_write(&dev->dev.bus->subsys.rwsem); 332 drv->link.remove = &card_remove; 333 device_release_driver(&dev->dev); 334 drv->link.remove = &card_remove_first; 335 up_write(&dev->dev.bus->subsys.rwsem); 336 } 337 338 /* 339 * suspend/resume callbacks 340 */ 341 static int card_suspend(struct pnp_dev *dev, pm_message_t state) 342 { 343 struct pnp_card_link *link = dev->card_link; 344 if (link->pm_state.event == state.event) 345 return 0; 346 link->pm_state = state; 347 return link->driver->suspend(link, state); 348 } 349 350 static int card_resume(struct pnp_dev *dev) 351 { 352 struct pnp_card_link *link = dev->card_link; 353 if (link->pm_state.event == PM_EVENT_ON) 354 return 0; 355 link->pm_state = PMSG_ON; 356 link->driver->resume(link); 357 return 0; 358 } 359 360 /** 361 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer 362 * @drv: pointer to the driver to register 363 */ 364 365 int pnp_register_card_driver(struct pnp_card_driver * drv) 366 { 367 int error; 368 struct list_head *pos, *temp; 369 370 drv->link.name = drv->name; 371 drv->link.id_table = NULL; /* this will disable auto matching */ 372 drv->link.flags = drv->flags; 373 drv->link.probe = NULL; 374 drv->link.remove = &card_remove_first; 375 drv->link.suspend = drv->suspend ? card_suspend : NULL; 376 drv->link.resume = drv->resume ? card_resume : NULL; 377 378 error = pnp_register_driver(&drv->link); 379 if (error < 0) 380 return error; 381 382 spin_lock(&pnp_lock); 383 list_add_tail(&drv->global_list, &pnp_card_drivers); 384 spin_unlock(&pnp_lock); 385 386 list_for_each_safe(pos,temp,&pnp_cards){ 387 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); 388 card_probe(card,drv); 389 } 390 return 0; 391 } 392 393 /** 394 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer 395 * @drv: pointer to the driver to unregister 396 */ 397 398 void pnp_unregister_card_driver(struct pnp_card_driver * drv) 399 { 400 spin_lock(&pnp_lock); 401 list_del(&drv->global_list); 402 spin_unlock(&pnp_lock); 403 pnp_unregister_driver(&drv->link); 404 } 405 406 #if 0 407 EXPORT_SYMBOL(pnp_add_card); 408 EXPORT_SYMBOL(pnp_remove_card); 409 EXPORT_SYMBOL(pnp_add_card_device); 410 EXPORT_SYMBOL(pnp_remove_card_device); 411 EXPORT_SYMBOL(pnp_add_card_id); 412 #endif /* 0 */ 413 EXPORT_SYMBOL(pnp_request_card_device); 414 EXPORT_SYMBOL(pnp_release_card_device); 415 EXPORT_SYMBOL(pnp_register_card_driver); 416 EXPORT_SYMBOL(pnp_unregister_card_driver); 417