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 int rc = device_create_file(&card->dev,&dev_attr_name); 168 if (rc) return rc; 169 170 rc = device_create_file(&card->dev,&dev_attr_card_id); 171 if (rc) goto err_name; 172 173 return 0; 174 175 err_name: 176 device_remove_file(&card->dev,&dev_attr_name); 177 return rc; 178 } 179 180 /** 181 * pnp_add_card - adds a PnP card to the PnP Layer 182 * @card: pointer to the card to add 183 */ 184 185 int pnp_add_card(struct pnp_card * card) 186 { 187 int error; 188 struct list_head * pos, * temp; 189 if (!card || !card->protocol) 190 return -EINVAL; 191 192 sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); 193 card->dev.parent = &card->protocol->dev; 194 card->dev.bus = NULL; 195 card->dev.release = &pnp_release_card; 196 error = device_register(&card->dev); 197 198 if (error == 0) { 199 pnp_interface_attach_card(card); 200 spin_lock(&pnp_lock); 201 list_add_tail(&card->global_list, &pnp_cards); 202 list_add_tail(&card->protocol_list, &card->protocol->cards); 203 spin_unlock(&pnp_lock); 204 205 /* we wait until now to add devices in order to ensure the drivers 206 * will be able to use all of the related devices on the card 207 * without waiting any unresonable length of time */ 208 list_for_each(pos,&card->devices){ 209 struct pnp_dev *dev = card_to_pnp_dev(pos); 210 __pnp_add_device(dev); 211 } 212 213 /* match with card drivers */ 214 list_for_each_safe(pos,temp,&pnp_card_drivers){ 215 struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); 216 card_probe(card,drv); 217 } 218 } else 219 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); 220 return error; 221 } 222 223 /** 224 * pnp_remove_card - removes a PnP card from the PnP Layer 225 * @card: pointer to the card to remove 226 */ 227 228 void pnp_remove_card(struct pnp_card * card) 229 { 230 struct list_head *pos, *temp; 231 if (!card) 232 return; 233 device_unregister(&card->dev); 234 spin_lock(&pnp_lock); 235 list_del(&card->global_list); 236 list_del(&card->protocol_list); 237 spin_unlock(&pnp_lock); 238 list_for_each_safe(pos,temp,&card->devices){ 239 struct pnp_dev *dev = card_to_pnp_dev(pos); 240 pnp_remove_card_device(dev); 241 } 242 } 243 244 /** 245 * pnp_add_card_device - adds a device to the specified card 246 * @card: pointer to the card to add to 247 * @dev: pointer to the device to add 248 */ 249 250 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) 251 { 252 if (!card || !dev || !dev->protocol) 253 return -EINVAL; 254 dev->dev.parent = &card->dev; 255 dev->card_link = NULL; 256 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, 257 card->number,dev->number); 258 spin_lock(&pnp_lock); 259 dev->card = card; 260 list_add_tail(&dev->card_list, &card->devices); 261 spin_unlock(&pnp_lock); 262 return 0; 263 } 264 265 /** 266 * pnp_remove_card_device- removes a device from the specified card 267 * @dev: pointer to the device to remove 268 */ 269 270 void pnp_remove_card_device(struct pnp_dev * dev) 271 { 272 spin_lock(&pnp_lock); 273 dev->card = NULL; 274 list_del(&dev->card_list); 275 spin_unlock(&pnp_lock); 276 __pnp_remove_device(dev); 277 } 278 279 /** 280 * pnp_request_card_device - Searches for a PnP device under the specified card 281 * @clink: pointer to the card link, cannot be NULL 282 * @id: pointer to a PnP ID structure that explains the rules for finding the device 283 * @from: Starting place to search from. If NULL it will start from the begining. 284 */ 285 286 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) 287 { 288 struct list_head * pos; 289 struct pnp_dev * dev; 290 struct pnp_card_driver * drv; 291 struct pnp_card * card; 292 if (!clink || !id) 293 goto done; 294 card = clink->card; 295 drv = clink->driver; 296 if (!from) { 297 pos = card->devices.next; 298 } else { 299 if (from->card != card) 300 goto done; 301 pos = from->card_list.next; 302 } 303 while (pos != &card->devices) { 304 dev = card_to_pnp_dev(pos); 305 if ((!dev->card_link) && compare_pnp_id(dev->id,id)) 306 goto found; 307 pos = pos->next; 308 } 309 310 done: 311 return NULL; 312 313 found: 314 dev->card_link = clink; 315 dev->dev.driver = &drv->link.driver; 316 if (pnp_bus_type.probe(&dev->dev)) 317 goto err_out; 318 if (device_bind_driver(&dev->dev)) 319 goto err_out; 320 321 return dev; 322 323 err_out: 324 dev->dev.driver = NULL; 325 dev->card_link = NULL; 326 return NULL; 327 } 328 329 /** 330 * pnp_release_card_device - call this when the driver no longer needs the device 331 * @dev: pointer to the PnP device stucture 332 */ 333 334 void pnp_release_card_device(struct pnp_dev * dev) 335 { 336 struct pnp_card_driver * drv = dev->card_link->driver; 337 if (!drv) 338 return; 339 drv->link.remove = &card_remove; 340 device_release_driver(&dev->dev); 341 drv->link.remove = &card_remove_first; 342 } 343 344 /* 345 * suspend/resume callbacks 346 */ 347 static int card_suspend(struct pnp_dev *dev, pm_message_t state) 348 { 349 struct pnp_card_link *link = dev->card_link; 350 if (link->pm_state.event == state.event) 351 return 0; 352 link->pm_state = state; 353 return link->driver->suspend(link, state); 354 } 355 356 static int card_resume(struct pnp_dev *dev) 357 { 358 struct pnp_card_link *link = dev->card_link; 359 if (link->pm_state.event == PM_EVENT_ON) 360 return 0; 361 link->pm_state = PMSG_ON; 362 link->driver->resume(link); 363 return 0; 364 } 365 366 /** 367 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer 368 * @drv: pointer to the driver to register 369 */ 370 371 int pnp_register_card_driver(struct pnp_card_driver * drv) 372 { 373 int error; 374 struct list_head *pos, *temp; 375 376 drv->link.name = drv->name; 377 drv->link.id_table = NULL; /* this will disable auto matching */ 378 drv->link.flags = drv->flags; 379 drv->link.probe = NULL; 380 drv->link.remove = &card_remove_first; 381 drv->link.suspend = drv->suspend ? card_suspend : NULL; 382 drv->link.resume = drv->resume ? card_resume : NULL; 383 384 error = pnp_register_driver(&drv->link); 385 if (error < 0) 386 return error; 387 388 spin_lock(&pnp_lock); 389 list_add_tail(&drv->global_list, &pnp_card_drivers); 390 spin_unlock(&pnp_lock); 391 392 list_for_each_safe(pos,temp,&pnp_cards){ 393 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); 394 card_probe(card,drv); 395 } 396 return 0; 397 } 398 399 /** 400 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer 401 * @drv: pointer to the driver to unregister 402 */ 403 404 void pnp_unregister_card_driver(struct pnp_card_driver * drv) 405 { 406 spin_lock(&pnp_lock); 407 list_del(&drv->global_list); 408 spin_unlock(&pnp_lock); 409 pnp_unregister_driver(&drv->link); 410 } 411 412 #if 0 413 EXPORT_SYMBOL(pnp_add_card); 414 EXPORT_SYMBOL(pnp_remove_card); 415 EXPORT_SYMBOL(pnp_add_card_device); 416 EXPORT_SYMBOL(pnp_remove_card_device); 417 EXPORT_SYMBOL(pnp_add_card_id); 418 #endif /* 0 */ 419 EXPORT_SYMBOL(pnp_request_card_device); 420 EXPORT_SYMBOL(pnp_release_card_device); 421 EXPORT_SYMBOL(pnp_register_card_driver); 422 EXPORT_SYMBOL(pnp_unregister_card_driver); 423