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 | ||
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/slab.h> | |
1da177e4 LT |
10 | #include <linux/pnp.h> |
11 | #include "base.h" | |
12 | ||
13 | LIST_HEAD(pnp_cards); | |
b449f63c | 14 | static LIST_HEAD(pnp_card_drivers); |
1da177e4 LT |
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 | } | |
982c6094 | 49 | |
1da177e4 LT |
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 | ||
a9adb8db | 62 | static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv) |
1da177e4 | 63 | { |
a9adb8db JJ |
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); | |
1da177e4 | 88 | } |
a9adb8db | 89 | kfree(clink); |
1da177e4 LT |
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 | ||
e404e274 | 140 | static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | ||
e404e274 | 150 | static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | device_create_file(&card->dev,&dev_attr_name); | |
168 | device_create_file(&card->dev,&dev_attr_card_id); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /** | |
173 | * pnp_add_card - adds a PnP card to the PnP Layer | |
174 | * @card: pointer to the card to add | |
175 | */ | |
176 | ||
177 | int pnp_add_card(struct pnp_card * card) | |
178 | { | |
179 | int error; | |
180 | struct list_head * pos, * temp; | |
181 | if (!card || !card->protocol) | |
182 | return -EINVAL; | |
183 | ||
184 | sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); | |
185 | card->dev.parent = &card->protocol->dev; | |
186 | card->dev.bus = NULL; | |
187 | card->dev.release = &pnp_release_card; | |
188 | error = device_register(&card->dev); | |
189 | ||
190 | if (error == 0) { | |
191 | pnp_interface_attach_card(card); | |
192 | spin_lock(&pnp_lock); | |
193 | list_add_tail(&card->global_list, &pnp_cards); | |
194 | list_add_tail(&card->protocol_list, &card->protocol->cards); | |
195 | spin_unlock(&pnp_lock); | |
196 | ||
197 | /* we wait until now to add devices in order to ensure the drivers | |
198 | * will be able to use all of the related devices on the card | |
199 | * without waiting any unresonable length of time */ | |
200 | list_for_each(pos,&card->devices){ | |
201 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
202 | __pnp_add_device(dev); | |
203 | } | |
204 | ||
205 | /* match with card drivers */ | |
206 | list_for_each_safe(pos,temp,&pnp_card_drivers){ | |
207 | struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); | |
208 | card_probe(card,drv); | |
209 | } | |
210 | } else | |
211 | pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); | |
212 | return error; | |
213 | } | |
214 | ||
215 | /** | |
216 | * pnp_remove_card - removes a PnP card from the PnP Layer | |
217 | * @card: pointer to the card to remove | |
218 | */ | |
219 | ||
220 | void pnp_remove_card(struct pnp_card * card) | |
221 | { | |
222 | struct list_head *pos, *temp; | |
223 | if (!card) | |
224 | return; | |
225 | device_unregister(&card->dev); | |
226 | spin_lock(&pnp_lock); | |
227 | list_del(&card->global_list); | |
228 | list_del(&card->protocol_list); | |
229 | spin_unlock(&pnp_lock); | |
230 | list_for_each_safe(pos,temp,&card->devices){ | |
231 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
232 | pnp_remove_card_device(dev); | |
233 | } | |
234 | } | |
235 | ||
236 | /** | |
237 | * pnp_add_card_device - adds a device to the specified card | |
238 | * @card: pointer to the card to add to | |
239 | * @dev: pointer to the device to add | |
240 | */ | |
241 | ||
242 | int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) | |
243 | { | |
244 | if (!card || !dev || !dev->protocol) | |
245 | return -EINVAL; | |
246 | dev->dev.parent = &card->dev; | |
247 | dev->card_link = NULL; | |
248 | snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, | |
249 | card->number,dev->number); | |
250 | spin_lock(&pnp_lock); | |
251 | dev->card = card; | |
252 | list_add_tail(&dev->card_list, &card->devices); | |
253 | spin_unlock(&pnp_lock); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | /** | |
258 | * pnp_remove_card_device- removes a device from the specified card | |
1da177e4 LT |
259 | * @dev: pointer to the device to remove |
260 | */ | |
261 | ||
262 | void pnp_remove_card_device(struct pnp_dev * dev) | |
263 | { | |
264 | spin_lock(&pnp_lock); | |
265 | dev->card = NULL; | |
266 | list_del(&dev->card_list); | |
267 | spin_unlock(&pnp_lock); | |
268 | __pnp_remove_device(dev); | |
269 | } | |
270 | ||
271 | /** | |
272 | * pnp_request_card_device - Searches for a PnP device under the specified card | |
3d41088f | 273 | * @clink: pointer to the card link, cannot be NULL |
1da177e4 LT |
274 | * @id: pointer to a PnP ID structure that explains the rules for finding the device |
275 | * @from: Starting place to search from. If NULL it will start from the begining. | |
276 | */ | |
277 | ||
278 | struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) | |
279 | { | |
280 | struct list_head * pos; | |
281 | struct pnp_dev * dev; | |
282 | struct pnp_card_driver * drv; | |
283 | struct pnp_card * card; | |
284 | if (!clink || !id) | |
285 | goto done; | |
286 | card = clink->card; | |
287 | drv = clink->driver; | |
288 | if (!from) { | |
289 | pos = card->devices.next; | |
290 | } else { | |
291 | if (from->card != card) | |
292 | goto done; | |
293 | pos = from->card_list.next; | |
294 | } | |
295 | while (pos != &card->devices) { | |
296 | dev = card_to_pnp_dev(pos); | |
297 | if ((!dev->card_link) && compare_pnp_id(dev->id,id)) | |
298 | goto found; | |
299 | pos = pos->next; | |
300 | } | |
301 | ||
302 | done: | |
303 | return NULL; | |
304 | ||
305 | found: | |
306 | down_write(&dev->dev.bus->subsys.rwsem); | |
307 | dev->card_link = clink; | |
308 | dev->dev.driver = &drv->link.driver; | |
8b613e1c AB |
309 | if (pnp_bus_type.probe(&dev->dev)) { |
310 | dev->dev.driver = NULL; | |
311 | dev->card_link = NULL; | |
312 | up_write(&dev->dev.bus->subsys.rwsem); | |
313 | return NULL; | |
1da177e4 LT |
314 | } |
315 | device_bind_driver(&dev->dev); | |
316 | up_write(&dev->dev.bus->subsys.rwsem); | |
317 | ||
318 | return dev; | |
319 | } | |
320 | ||
321 | /** | |
322 | * pnp_release_card_device - call this when the driver no longer needs the device | |
323 | * @dev: pointer to the PnP device stucture | |
324 | */ | |
325 | ||
326 | void pnp_release_card_device(struct pnp_dev * dev) | |
327 | { | |
328 | struct pnp_card_driver * drv = dev->card_link->driver; | |
329 | if (!drv) | |
330 | return; | |
331 | down_write(&dev->dev.bus->subsys.rwsem); | |
332 | drv->link.remove = &card_remove; | |
333 | device_release_driver(&dev->dev); | |
334 | drv->link.remove = &card_remove_first; | |
335 | up_write(&dev->dev.bus->subsys.rwsem); | |
336 | } | |
337 | ||
4c98cfef TI |
338 | /* |
339 | * suspend/resume callbacks | |
340 | */ | |
341 | static int card_suspend(struct pnp_dev *dev, pm_message_t state) | |
342 | { | |
343 | struct pnp_card_link *link = dev->card_link; | |
344 | if (link->pm_state.event == state.event) | |
345 | return 0; | |
346 | link->pm_state = state; | |
347 | return link->driver->suspend(link, state); | |
348 | } | |
349 | ||
350 | static int card_resume(struct pnp_dev *dev) | |
351 | { | |
352 | struct pnp_card_link *link = dev->card_link; | |
353 | if (link->pm_state.event == PM_EVENT_ON) | |
354 | return 0; | |
355 | link->pm_state = PMSG_ON; | |
356 | link->driver->resume(link); | |
357 | return 0; | |
358 | } | |
359 | ||
1da177e4 LT |
360 | /** |
361 | * pnp_register_card_driver - registers a PnP card driver with the PnP Layer | |
362 | * @drv: pointer to the driver to register | |
363 | */ | |
364 | ||
365 | int pnp_register_card_driver(struct pnp_card_driver * drv) | |
366 | { | |
982c6094 | 367 | int error; |
1da177e4 LT |
368 | struct list_head *pos, *temp; |
369 | ||
370 | drv->link.name = drv->name; | |
371 | drv->link.id_table = NULL; /* this will disable auto matching */ | |
372 | drv->link.flags = drv->flags; | |
373 | drv->link.probe = NULL; | |
374 | drv->link.remove = &card_remove_first; | |
4c98cfef TI |
375 | drv->link.suspend = drv->suspend ? card_suspend : NULL; |
376 | drv->link.resume = drv->resume ? card_resume : NULL; | |
1da177e4 | 377 | |
982c6094 BH |
378 | error = pnp_register_driver(&drv->link); |
379 | if (error < 0) | |
380 | return error; | |
d1d051b2 | 381 | |
1da177e4 LT |
382 | spin_lock(&pnp_lock); |
383 | list_add_tail(&drv->global_list, &pnp_card_drivers); | |
384 | spin_unlock(&pnp_lock); | |
d1d051b2 | 385 | |
1da177e4 LT |
386 | list_for_each_safe(pos,temp,&pnp_cards){ |
387 | struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); | |
982c6094 | 388 | card_probe(card,drv); |
1da177e4 | 389 | } |
982c6094 | 390 | return 0; |
1da177e4 LT |
391 | } |
392 | ||
393 | /** | |
394 | * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer | |
395 | * @drv: pointer to the driver to unregister | |
396 | */ | |
397 | ||
398 | void pnp_unregister_card_driver(struct pnp_card_driver * drv) | |
399 | { | |
400 | spin_lock(&pnp_lock); | |
401 | list_del(&drv->global_list); | |
402 | spin_unlock(&pnp_lock); | |
403 | pnp_unregister_driver(&drv->link); | |
404 | } | |
405 | ||
b449f63c | 406 | #if 0 |
1da177e4 LT |
407 | EXPORT_SYMBOL(pnp_add_card); |
408 | EXPORT_SYMBOL(pnp_remove_card); | |
409 | EXPORT_SYMBOL(pnp_add_card_device); | |
410 | EXPORT_SYMBOL(pnp_remove_card_device); | |
411 | EXPORT_SYMBOL(pnp_add_card_id); | |
b449f63c | 412 | #endif /* 0 */ |
1da177e4 LT |
413 | EXPORT_SYMBOL(pnp_request_card_device); |
414 | EXPORT_SYMBOL(pnp_release_card_device); | |
415 | EXPORT_SYMBOL(pnp_register_card_driver); | |
416 | EXPORT_SYMBOL(pnp_unregister_card_driver); |