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 #include <linux/module.h> 8 #include <linux/slab.h> 9 #include <linux/pnp.h> 10 #include "base.h" 11 12 LIST_HEAD(pnp_cards); 13 static LIST_HEAD(pnp_card_drivers); 14 15 static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv, 16 struct pnp_card *card) 17 { 18 const struct pnp_card_device_id *drv_id = drv->id_table; 19 20 while (*drv_id->id) { 21 if (compare_pnp_id(card->id, drv_id->id)) { 22 int i = 0; 23 24 for (;;) { 25 int found; 26 struct pnp_dev *dev; 27 28 if (i == PNP_MAX_DEVICES || 29 !*drv_id->devs[i].id) 30 return drv_id; 31 found = 0; 32 card_for_each_dev(card, dev) { 33 if (compare_pnp_id(dev->id, 34 drv_id->devs[i].id)) { 35 found = 1; 36 break; 37 } 38 } 39 if (!found) 40 break; 41 i++; 42 } 43 } 44 drv_id++; 45 } 46 return NULL; 47 } 48 49 static void card_remove(struct pnp_dev *dev) 50 { 51 dev->card_link = NULL; 52 } 53 54 static void card_remove_first(struct pnp_dev *dev) 55 { 56 struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver); 57 58 if (!dev->card || !drv) 59 return; 60 if (drv->remove) 61 drv->remove(dev->card_link); 62 drv->link.remove = &card_remove; 63 kfree(dev->card_link); 64 card_remove(dev); 65 } 66 67 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv) 68 { 69 const struct pnp_card_device_id *id; 70 struct pnp_card_link *clink; 71 struct pnp_dev *dev; 72 73 if (!drv->probe) 74 return 0; 75 id = match_card(drv, card); 76 if (!id) 77 return 0; 78 79 clink = pnp_alloc(sizeof(*clink)); 80 if (!clink) 81 return 0; 82 clink->card = card; 83 clink->driver = drv; 84 clink->pm_state = PMSG_ON; 85 86 if (drv->probe(clink, id) >= 0) 87 return 1; 88 89 /* Recovery */ 90 card_for_each_dev(card, dev) { 91 if (dev->card_link == clink) 92 pnp_release_card_device(dev); 93 } 94 kfree(clink); 95 return 0; 96 } 97 98 /** 99 * pnp_add_card_id - adds an EISA id to the specified card 100 * @id: pointer to a pnp_id structure 101 * @card: pointer to the desired card 102 */ 103 int pnp_add_card_id(struct pnp_id *id, struct pnp_card *card) 104 { 105 struct pnp_id *ptr; 106 107 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; 122 123 id = card->id; 124 while (id) { 125 next = id->next; 126 kfree(id); 127 id = next; 128 } 129 } 130 131 static void pnp_release_card(struct device *dmdev) 132 { 133 struct pnp_card *card = to_pnp_card(dmdev); 134 135 pnp_free_card_ids(card); 136 kfree(card); 137 } 138 139 static ssize_t pnp_show_card_name(struct device *dmdev, 140 struct device_attribute *attr, char *buf) 141 { 142 char *str = buf; 143 struct pnp_card *card = to_pnp_card(dmdev); 144 145 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, 152 struct device_attribute *attr, char *buf) 153 { 154 char *str = buf; 155 struct pnp_card *card = to_pnp_card(dmdev); 156 struct pnp_id *pos = card->id; 157 158 while (pos) { 159 str += sprintf(str, "%s\n", pos->id); 160 pos = pos->next; 161 } 162 return (str - buf); 163 } 164 165 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL); 166 167 static int pnp_interface_attach_card(struct pnp_card *card) 168 { 169 int rc = device_create_file(&card->dev, &dev_attr_name); 170 171 if (rc) 172 return rc; 173 174 rc = device_create_file(&card->dev, &dev_attr_card_id); 175 if (rc) 176 goto err_name; 177 178 return 0; 179 180 err_name: 181 device_remove_file(&card->dev, &dev_attr_name); 182 return rc; 183 } 184 185 /** 186 * pnp_add_card - adds a PnP card to the PnP Layer 187 * @card: pointer to the card to add 188 */ 189 int pnp_add_card(struct pnp_card *card) 190 { 191 int error; 192 struct list_head *pos, *temp; 193 194 sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, 195 card->number); 196 card->dev.parent = &card->protocol->dev; 197 card->dev.bus = NULL; 198 card->dev.release = &pnp_release_card; 199 error = device_register(&card->dev); 200 if (error) { 201 dev_err(&card->dev, "could not register (err=%d)\n", error); 202 return error; 203 } 204 205 pnp_interface_attach_card(card); 206 spin_lock(&pnp_lock); 207 list_add_tail(&card->global_list, &pnp_cards); 208 list_add_tail(&card->protocol_list, &card->protocol->cards); 209 spin_unlock(&pnp_lock); 210 211 /* we wait until now to add devices in order to ensure the drivers 212 * will be able to use all of the related devices on the card 213 * without waiting an unreasonable length of time */ 214 list_for_each(pos, &card->devices) { 215 struct pnp_dev *dev = card_to_pnp_dev(pos); 216 __pnp_add_device(dev); 217 } 218 219 /* match with card drivers */ 220 list_for_each_safe(pos, temp, &pnp_card_drivers) { 221 struct pnp_card_driver *drv = 222 list_entry(pos, struct pnp_card_driver, 223 global_list); 224 card_probe(card, drv); 225 } 226 return 0; 227 } 228 229 /** 230 * pnp_remove_card - removes a PnP card from the PnP Layer 231 * @card: pointer to the card to remove 232 */ 233 void pnp_remove_card(struct pnp_card *card) 234 { 235 struct list_head *pos, *temp; 236 237 device_unregister(&card->dev); 238 spin_lock(&pnp_lock); 239 list_del(&card->global_list); 240 list_del(&card->protocol_list); 241 spin_unlock(&pnp_lock); 242 list_for_each_safe(pos, temp, &card->devices) { 243 struct pnp_dev *dev = card_to_pnp_dev(pos); 244 pnp_remove_card_device(dev); 245 } 246 } 247 248 /** 249 * pnp_add_card_device - adds a device to the specified card 250 * @card: pointer to the card to add to 251 * @dev: pointer to the device to add 252 */ 253 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev) 254 { 255 dev->dev.parent = &card->dev; 256 dev->card_link = NULL; 257 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", 258 dev->protocol->number, card->number, dev->number); 259 spin_lock(&pnp_lock); 260 dev->card = card; 261 list_add_tail(&dev->card_list, &card->devices); 262 spin_unlock(&pnp_lock); 263 return 0; 264 } 265 266 /** 267 * pnp_remove_card_device- removes a device from the specified card 268 * @dev: pointer to the device to remove 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 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink, 286 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; 292 293 if (!clink || !id) 294 return NULL; 295 296 card = clink->card; 297 drv = clink->driver; 298 if (!from) { 299 pos = card->devices.next; 300 } else { 301 if (from->card != card) 302 return NULL; 303 pos = from->card_list.next; 304 } 305 while (pos != &card->devices) { 306 dev = card_to_pnp_dev(pos); 307 if ((!dev->card_link) && compare_pnp_id(dev->id, id)) 308 goto found; 309 pos = pos->next; 310 } 311 312 return NULL; 313 314 found: 315 dev->card_link = clink; 316 dev->dev.driver = &drv->link.driver; 317 if (pnp_bus_type.probe(&dev->dev)) 318 goto err_out; 319 if (device_bind_driver(&dev->dev)) 320 goto err_out; 321 322 return dev; 323 324 err_out: 325 dev->dev.driver = NULL; 326 dev->card_link = NULL; 327 return NULL; 328 } 329 330 /** 331 * pnp_release_card_device - call this when the driver no longer needs the device 332 * @dev: pointer to the PnP device stucture 333 */ 334 void pnp_release_card_device(struct pnp_dev *dev) 335 { 336 struct pnp_card_driver *drv = dev->card_link->driver; 337 338 drv->link.remove = &card_remove; 339 device_release_driver(&dev->dev); 340 drv->link.remove = &card_remove_first; 341 } 342 343 /* 344 * suspend/resume callbacks 345 */ 346 static int card_suspend(struct pnp_dev *dev, pm_message_t state) 347 { 348 struct pnp_card_link *link = dev->card_link; 349 350 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; 359 360 if (link->pm_state.event == PM_EVENT_ON) 361 return 0; 362 link->pm_state = PMSG_ON; 363 link->driver->resume(link); 364 return 0; 365 } 366 367 /** 368 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer 369 * @drv: pointer to the driver to register 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 = 394 list_entry(pos, struct pnp_card, global_list); 395 card_probe(card, drv); 396 } 397 return 0; 398 } 399 400 /** 401 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer 402 * @drv: pointer to the driver to unregister 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 EXPORT_SYMBOL(pnp_request_card_device); 413 EXPORT_SYMBOL(pnp_release_card_device); 414 EXPORT_SYMBOL(pnp_register_card_driver); 415 EXPORT_SYMBOL(pnp_unregister_card_driver); 416