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