Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
11 | #include <linux/pnp.h> |
12 | #include "base.h" | |
13 | ||
14 | LIST_HEAD(pnp_cards); | |
b449f63c | 15 | static LIST_HEAD(pnp_card_drivers); |
1da177e4 LT |
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 | ||
e404e274 | 136 | static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | ||
e404e274 | 146 | static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
1da177e4 LT |
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 | |
3d41088f | 269 | * @clink: pointer to the card link, cannot be NULL |
1da177e4 LT |
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; | |
30d5b64b JK |
308 | dev->card_link = NULL; |
309 | up_write(&dev->dev.bus->subsys.rwsem); | |
1da177e4 LT |
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 | ||
b449f63c | 377 | #if 0 |
1da177e4 LT |
378 | EXPORT_SYMBOL(pnp_add_card); |
379 | EXPORT_SYMBOL(pnp_remove_card); | |
380 | EXPORT_SYMBOL(pnp_add_card_device); | |
381 | EXPORT_SYMBOL(pnp_remove_card_device); | |
382 | EXPORT_SYMBOL(pnp_add_card_id); | |
b449f63c | 383 | #endif /* 0 */ |
1da177e4 LT |
384 | EXPORT_SYMBOL(pnp_request_card_device); |
385 | EXPORT_SYMBOL(pnp_release_card_device); | |
386 | EXPORT_SYMBOL(pnp_register_card_driver); | |
387 | EXPORT_SYMBOL(pnp_unregister_card_driver); |