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> | |
11 | ||
12 | #ifdef CONFIG_PNP_DEBUG | |
13 | #define DEBUG | |
14 | #else | |
15 | #undef DEBUG | |
16 | #endif | |
17 | ||
18 | #include <linux/pnp.h> | |
19 | #include "base.h" | |
20 | ||
21 | LIST_HEAD(pnp_cards); | |
22 | LIST_HEAD(pnp_card_drivers); | |
23 | ||
24 | ||
25 | static const struct pnp_card_device_id * match_card(struct pnp_card_driver * drv, struct pnp_card * card) | |
26 | { | |
27 | const struct pnp_card_device_id * drv_id = drv->id_table; | |
28 | while (*drv_id->id){ | |
29 | if (compare_pnp_id(card->id,drv_id->id)) { | |
30 | int i = 0; | |
31 | for (;;) { | |
32 | int found; | |
33 | struct pnp_dev *dev; | |
34 | if (i == PNP_MAX_DEVICES || ! *drv_id->devs[i].id) | |
35 | return drv_id; | |
36 | found = 0; | |
37 | card_for_each_dev(card, dev) { | |
38 | if (compare_pnp_id(dev->id, drv_id->devs[i].id)) { | |
39 | found = 1; | |
40 | break; | |
41 | } | |
42 | } | |
43 | if (! found) | |
44 | break; | |
45 | i++; | |
46 | } | |
47 | } | |
48 | drv_id++; | |
49 | } | |
50 | return NULL; | |
51 | } | |
52 | ||
53 | static void card_remove(struct pnp_dev * dev) | |
54 | { | |
55 | dev->card_link = NULL; | |
56 | } | |
57 | ||
58 | static void card_remove_first(struct pnp_dev * dev) | |
59 | { | |
60 | struct pnp_card_driver * drv = to_pnp_card_driver(dev->driver); | |
61 | if (!dev->card || !drv) | |
62 | return; | |
63 | if (drv->remove) | |
64 | drv->remove(dev->card_link); | |
65 | drv->link.remove = &card_remove; | |
66 | kfree(dev->card_link); | |
67 | card_remove(dev); | |
68 | } | |
69 | ||
70 | static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv) | |
71 | { | |
72 | const struct pnp_card_device_id *id = match_card(drv,card); | |
73 | if (id) { | |
74 | struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link)); | |
75 | if (!clink) | |
76 | return 0; | |
77 | clink->card = card; | |
78 | clink->driver = drv; | |
79 | if (drv->probe) { | |
80 | if (drv->probe(clink, id)>=0) | |
81 | return 1; | |
82 | else { | |
83 | struct pnp_dev * dev; | |
84 | card_for_each_dev(card, dev) { | |
85 | if (dev->card_link == clink) | |
86 | pnp_release_card_device(dev); | |
87 | } | |
88 | kfree(clink); | |
89 | } | |
90 | } else | |
91 | return 1; | |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
96 | /** | |
97 | * pnp_add_card_id - adds an EISA id to the specified card | |
98 | * @id: pointer to a pnp_id structure | |
99 | * @card: pointer to the desired card | |
100 | * | |
101 | */ | |
102 | ||
103 | int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card) | |
104 | { | |
105 | struct pnp_id * ptr; | |
106 | if (!id) | |
107 | return -EINVAL; | |
108 | if (!card) | |
109 | return -EINVAL; | |
110 | id->next = NULL; | |
111 | ptr = card->id; | |
112 | while (ptr && ptr->next) | |
113 | ptr = ptr->next; | |
114 | if (ptr) | |
115 | ptr->next = id; | |
116 | else | |
117 | card->id = id; | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static void pnp_free_card_ids(struct pnp_card * card) | |
122 | { | |
123 | struct pnp_id * id; | |
124 | struct pnp_id *next; | |
125 | if (!card) | |
126 | return; | |
127 | id = card->id; | |
128 | while (id) { | |
129 | next = id->next; | |
130 | kfree(id); | |
131 | id = next; | |
132 | } | |
133 | } | |
134 | ||
135 | static void pnp_release_card(struct device *dmdev) | |
136 | { | |
137 | struct pnp_card * card = to_pnp_card(dmdev); | |
138 | pnp_free_card_ids(card); | |
139 | kfree(card); | |
140 | } | |
141 | ||
142 | ||
e404e274 | 143 | static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
144 | { |
145 | char *str = buf; | |
146 | struct pnp_card *card = to_pnp_card(dmdev); | |
147 | str += sprintf(str,"%s\n", card->name); | |
148 | return (str - buf); | |
149 | } | |
150 | ||
151 | static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL); | |
152 | ||
e404e274 | 153 | static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
154 | { |
155 | char *str = buf; | |
156 | struct pnp_card *card = to_pnp_card(dmdev); | |
157 | struct pnp_id * pos = card->id; | |
158 | ||
159 | while (pos) { | |
160 | str += sprintf(str,"%s\n", pos->id); | |
161 | pos = pos->next; | |
162 | } | |
163 | return (str - buf); | |
164 | } | |
165 | ||
166 | static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL); | |
167 | ||
168 | static int pnp_interface_attach_card(struct pnp_card *card) | |
169 | { | |
170 | device_create_file(&card->dev,&dev_attr_name); | |
171 | device_create_file(&card->dev,&dev_attr_card_id); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * pnp_add_card - adds a PnP card to the PnP Layer | |
177 | * @card: pointer to the card to add | |
178 | */ | |
179 | ||
180 | int pnp_add_card(struct pnp_card * card) | |
181 | { | |
182 | int error; | |
183 | struct list_head * pos, * temp; | |
184 | if (!card || !card->protocol) | |
185 | return -EINVAL; | |
186 | ||
187 | sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); | |
188 | card->dev.parent = &card->protocol->dev; | |
189 | card->dev.bus = NULL; | |
190 | card->dev.release = &pnp_release_card; | |
191 | error = device_register(&card->dev); | |
192 | ||
193 | if (error == 0) { | |
194 | pnp_interface_attach_card(card); | |
195 | spin_lock(&pnp_lock); | |
196 | list_add_tail(&card->global_list, &pnp_cards); | |
197 | list_add_tail(&card->protocol_list, &card->protocol->cards); | |
198 | spin_unlock(&pnp_lock); | |
199 | ||
200 | /* we wait until now to add devices in order to ensure the drivers | |
201 | * will be able to use all of the related devices on the card | |
202 | * without waiting any unresonable length of time */ | |
203 | list_for_each(pos,&card->devices){ | |
204 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
205 | __pnp_add_device(dev); | |
206 | } | |
207 | ||
208 | /* match with card drivers */ | |
209 | list_for_each_safe(pos,temp,&pnp_card_drivers){ | |
210 | struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); | |
211 | card_probe(card,drv); | |
212 | } | |
213 | } else | |
214 | pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); | |
215 | return error; | |
216 | } | |
217 | ||
218 | /** | |
219 | * pnp_remove_card - removes a PnP card from the PnP Layer | |
220 | * @card: pointer to the card to remove | |
221 | */ | |
222 | ||
223 | void pnp_remove_card(struct pnp_card * card) | |
224 | { | |
225 | struct list_head *pos, *temp; | |
226 | if (!card) | |
227 | return; | |
228 | device_unregister(&card->dev); | |
229 | spin_lock(&pnp_lock); | |
230 | list_del(&card->global_list); | |
231 | list_del(&card->protocol_list); | |
232 | spin_unlock(&pnp_lock); | |
233 | list_for_each_safe(pos,temp,&card->devices){ | |
234 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
235 | pnp_remove_card_device(dev); | |
236 | } | |
237 | } | |
238 | ||
239 | /** | |
240 | * pnp_add_card_device - adds a device to the specified card | |
241 | * @card: pointer to the card to add to | |
242 | * @dev: pointer to the device to add | |
243 | */ | |
244 | ||
245 | int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) | |
246 | { | |
247 | if (!card || !dev || !dev->protocol) | |
248 | return -EINVAL; | |
249 | dev->dev.parent = &card->dev; | |
250 | dev->card_link = NULL; | |
251 | snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, | |
252 | card->number,dev->number); | |
253 | spin_lock(&pnp_lock); | |
254 | dev->card = card; | |
255 | list_add_tail(&dev->card_list, &card->devices); | |
256 | spin_unlock(&pnp_lock); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /** | |
261 | * pnp_remove_card_device- removes a device from the specified card | |
1da177e4 LT |
262 | * @dev: pointer to the device to remove |
263 | */ | |
264 | ||
265 | void pnp_remove_card_device(struct pnp_dev * dev) | |
266 | { | |
267 | spin_lock(&pnp_lock); | |
268 | dev->card = NULL; | |
269 | list_del(&dev->card_list); | |
270 | spin_unlock(&pnp_lock); | |
271 | __pnp_remove_device(dev); | |
272 | } | |
273 | ||
274 | /** | |
275 | * pnp_request_card_device - Searches for a PnP device under the specified card | |
3d41088f | 276 | * @clink: pointer to the card link, cannot be NULL |
1da177e4 LT |
277 | * @id: pointer to a PnP ID structure that explains the rules for finding the device |
278 | * @from: Starting place to search from. If NULL it will start from the begining. | |
279 | */ | |
280 | ||
281 | struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) | |
282 | { | |
283 | struct list_head * pos; | |
284 | struct pnp_dev * dev; | |
285 | struct pnp_card_driver * drv; | |
286 | struct pnp_card * card; | |
287 | if (!clink || !id) | |
288 | goto done; | |
289 | card = clink->card; | |
290 | drv = clink->driver; | |
291 | if (!from) { | |
292 | pos = card->devices.next; | |
293 | } else { | |
294 | if (from->card != card) | |
295 | goto done; | |
296 | pos = from->card_list.next; | |
297 | } | |
298 | while (pos != &card->devices) { | |
299 | dev = card_to_pnp_dev(pos); | |
300 | if ((!dev->card_link) && compare_pnp_id(dev->id,id)) | |
301 | goto found; | |
302 | pos = pos->next; | |
303 | } | |
304 | ||
305 | done: | |
306 | return NULL; | |
307 | ||
308 | found: | |
309 | down_write(&dev->dev.bus->subsys.rwsem); | |
310 | dev->card_link = clink; | |
311 | dev->dev.driver = &drv->link.driver; | |
312 | if (drv->link.driver.probe) { | |
313 | if (drv->link.driver.probe(&dev->dev)) { | |
314 | dev->dev.driver = NULL; | |
315 | return NULL; | |
316 | } | |
317 | } | |
318 | device_bind_driver(&dev->dev); | |
319 | up_write(&dev->dev.bus->subsys.rwsem); | |
320 | ||
321 | return dev; | |
322 | } | |
323 | ||
324 | /** | |
325 | * pnp_release_card_device - call this when the driver no longer needs the device | |
326 | * @dev: pointer to the PnP device stucture | |
327 | */ | |
328 | ||
329 | void pnp_release_card_device(struct pnp_dev * dev) | |
330 | { | |
331 | struct pnp_card_driver * drv = dev->card_link->driver; | |
332 | if (!drv) | |
333 | return; | |
334 | down_write(&dev->dev.bus->subsys.rwsem); | |
335 | drv->link.remove = &card_remove; | |
336 | device_release_driver(&dev->dev); | |
337 | drv->link.remove = &card_remove_first; | |
338 | up_write(&dev->dev.bus->subsys.rwsem); | |
339 | } | |
340 | ||
341 | /** | |
342 | * pnp_register_card_driver - registers a PnP card driver with the PnP Layer | |
343 | * @drv: pointer to the driver to register | |
344 | */ | |
345 | ||
346 | int pnp_register_card_driver(struct pnp_card_driver * drv) | |
347 | { | |
348 | int count = 0; | |
349 | struct list_head *pos, *temp; | |
350 | ||
351 | drv->link.name = drv->name; | |
352 | drv->link.id_table = NULL; /* this will disable auto matching */ | |
353 | drv->link.flags = drv->flags; | |
354 | drv->link.probe = NULL; | |
355 | drv->link.remove = &card_remove_first; | |
356 | ||
357 | spin_lock(&pnp_lock); | |
358 | list_add_tail(&drv->global_list, &pnp_card_drivers); | |
359 | spin_unlock(&pnp_lock); | |
360 | pnp_register_driver(&drv->link); | |
361 | ||
362 | list_for_each_safe(pos,temp,&pnp_cards){ | |
363 | struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); | |
364 | count += card_probe(card,drv); | |
365 | } | |
366 | return count; | |
367 | } | |
368 | ||
369 | /** | |
370 | * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer | |
371 | * @drv: pointer to the driver to unregister | |
372 | */ | |
373 | ||
374 | void pnp_unregister_card_driver(struct pnp_card_driver * drv) | |
375 | { | |
376 | spin_lock(&pnp_lock); | |
377 | list_del(&drv->global_list); | |
378 | spin_unlock(&pnp_lock); | |
379 | pnp_unregister_driver(&drv->link); | |
380 | } | |
381 | ||
382 | EXPORT_SYMBOL(pnp_add_card); | |
383 | EXPORT_SYMBOL(pnp_remove_card); | |
384 | EXPORT_SYMBOL(pnp_add_card_device); | |
385 | EXPORT_SYMBOL(pnp_remove_card_device); | |
386 | EXPORT_SYMBOL(pnp_add_card_id); | |
387 | EXPORT_SYMBOL(pnp_request_card_device); | |
388 | EXPORT_SYMBOL(pnp_release_card_device); | |
389 | EXPORT_SYMBOL(pnp_register_card_driver); | |
390 | EXPORT_SYMBOL(pnp_unregister_card_driver); |