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Commit | Line | Data |
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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 | } | |
982c6094 | 50 | |
1da177e4 LT |
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 | ||
a9adb8db | 63 | static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv) |
1da177e4 | 64 | { |
a9adb8db JJ |
65 | const struct pnp_card_device_id *id; |
66 | struct pnp_card_link *clink; | |
67 | struct pnp_dev *dev; | |
68 | ||
69 | if (!drv->probe) | |
70 | return 0; | |
71 | id = match_card(drv,card); | |
72 | if (!id) | |
73 | return 0; | |
74 | ||
75 | clink = pnp_alloc(sizeof(*clink)); | |
76 | if (!clink) | |
77 | return 0; | |
78 | clink->card = card; | |
79 | clink->driver = drv; | |
80 | clink->pm_state = PMSG_ON; | |
81 | ||
82 | if (drv->probe(clink, id) >= 0) | |
83 | return 1; | |
84 | ||
85 | /* Recovery */ | |
86 | card_for_each_dev(card, dev) { | |
87 | if (dev->card_link == clink) | |
88 | pnp_release_card_device(dev); | |
1da177e4 | 89 | } |
a9adb8db | 90 | kfree(clink); |
1da177e4 LT |
91 | return 0; |
92 | } | |
93 | ||
94 | /** | |
95 | * pnp_add_card_id - adds an EISA id to the specified card | |
96 | * @id: pointer to a pnp_id structure | |
97 | * @card: pointer to the desired card | |
98 | * | |
99 | */ | |
100 | ||
101 | int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card) | |
102 | { | |
103 | struct pnp_id * ptr; | |
104 | if (!id) | |
105 | return -EINVAL; | |
106 | if (!card) | |
107 | return -EINVAL; | |
108 | id->next = NULL; | |
109 | ptr = card->id; | |
110 | while (ptr && ptr->next) | |
111 | ptr = ptr->next; | |
112 | if (ptr) | |
113 | ptr->next = id; | |
114 | else | |
115 | card->id = id; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static void pnp_free_card_ids(struct pnp_card * card) | |
120 | { | |
121 | struct pnp_id * id; | |
122 | struct pnp_id *next; | |
123 | if (!card) | |
124 | return; | |
125 | id = card->id; | |
126 | while (id) { | |
127 | next = id->next; | |
128 | kfree(id); | |
129 | id = next; | |
130 | } | |
131 | } | |
132 | ||
133 | static void pnp_release_card(struct device *dmdev) | |
134 | { | |
135 | struct pnp_card * card = to_pnp_card(dmdev); | |
136 | pnp_free_card_ids(card); | |
137 | kfree(card); | |
138 | } | |
139 | ||
140 | ||
e404e274 | 141 | static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
142 | { |
143 | char *str = buf; | |
144 | struct pnp_card *card = to_pnp_card(dmdev); | |
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 | ||
e404e274 | 151 | static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
152 | { |
153 | char *str = buf; | |
154 | struct pnp_card *card = to_pnp_card(dmdev); | |
155 | struct pnp_id * pos = card->id; | |
156 | ||
157 | while (pos) { | |
158 | str += sprintf(str,"%s\n", pos->id); | |
159 | pos = pos->next; | |
160 | } | |
161 | return (str - buf); | |
162 | } | |
163 | ||
164 | static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL); | |
165 | ||
166 | static int pnp_interface_attach_card(struct pnp_card *card) | |
167 | { | |
168 | device_create_file(&card->dev,&dev_attr_name); | |
169 | device_create_file(&card->dev,&dev_attr_card_id); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /** | |
174 | * pnp_add_card - adds a PnP card to the PnP Layer | |
175 | * @card: pointer to the card to add | |
176 | */ | |
177 | ||
178 | int pnp_add_card(struct pnp_card * card) | |
179 | { | |
180 | int error; | |
181 | struct list_head * pos, * temp; | |
182 | if (!card || !card->protocol) | |
183 | return -EINVAL; | |
184 | ||
185 | sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number); | |
186 | card->dev.parent = &card->protocol->dev; | |
187 | card->dev.bus = NULL; | |
188 | card->dev.release = &pnp_release_card; | |
189 | error = device_register(&card->dev); | |
190 | ||
191 | if (error == 0) { | |
192 | pnp_interface_attach_card(card); | |
193 | spin_lock(&pnp_lock); | |
194 | list_add_tail(&card->global_list, &pnp_cards); | |
195 | list_add_tail(&card->protocol_list, &card->protocol->cards); | |
196 | spin_unlock(&pnp_lock); | |
197 | ||
198 | /* we wait until now to add devices in order to ensure the drivers | |
199 | * will be able to use all of the related devices on the card | |
200 | * without waiting any unresonable length of time */ | |
201 | list_for_each(pos,&card->devices){ | |
202 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
203 | __pnp_add_device(dev); | |
204 | } | |
205 | ||
206 | /* match with card drivers */ | |
207 | list_for_each_safe(pos,temp,&pnp_card_drivers){ | |
208 | struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list); | |
209 | card_probe(card,drv); | |
210 | } | |
211 | } else | |
212 | pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id); | |
213 | return error; | |
214 | } | |
215 | ||
216 | /** | |
217 | * pnp_remove_card - removes a PnP card from the PnP Layer | |
218 | * @card: pointer to the card to remove | |
219 | */ | |
220 | ||
221 | void pnp_remove_card(struct pnp_card * card) | |
222 | { | |
223 | struct list_head *pos, *temp; | |
224 | if (!card) | |
225 | return; | |
226 | device_unregister(&card->dev); | |
227 | spin_lock(&pnp_lock); | |
228 | list_del(&card->global_list); | |
229 | list_del(&card->protocol_list); | |
230 | spin_unlock(&pnp_lock); | |
231 | list_for_each_safe(pos,temp,&card->devices){ | |
232 | struct pnp_dev *dev = card_to_pnp_dev(pos); | |
233 | pnp_remove_card_device(dev); | |
234 | } | |
235 | } | |
236 | ||
237 | /** | |
238 | * pnp_add_card_device - adds a device to the specified card | |
239 | * @card: pointer to the card to add to | |
240 | * @dev: pointer to the device to add | |
241 | */ | |
242 | ||
243 | int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev) | |
244 | { | |
245 | if (!card || !dev || !dev->protocol) | |
246 | return -EINVAL; | |
247 | dev->dev.parent = &card->dev; | |
248 | dev->card_link = NULL; | |
249 | snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number, | |
250 | card->number,dev->number); | |
251 | spin_lock(&pnp_lock); | |
252 | dev->card = card; | |
253 | list_add_tail(&dev->card_list, &card->devices); | |
254 | spin_unlock(&pnp_lock); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /** | |
259 | * pnp_remove_card_device- removes a device from the specified card | |
1da177e4 LT |
260 | * @dev: pointer to the device to remove |
261 | */ | |
262 | ||
263 | void pnp_remove_card_device(struct pnp_dev * dev) | |
264 | { | |
265 | spin_lock(&pnp_lock); | |
266 | dev->card = NULL; | |
267 | list_del(&dev->card_list); | |
268 | spin_unlock(&pnp_lock); | |
269 | __pnp_remove_device(dev); | |
270 | } | |
271 | ||
272 | /** | |
273 | * pnp_request_card_device - Searches for a PnP device under the specified card | |
3d41088f | 274 | * @clink: pointer to the card link, cannot be NULL |
1da177e4 LT |
275 | * @id: pointer to a PnP ID structure that explains the rules for finding the device |
276 | * @from: Starting place to search from. If NULL it will start from the begining. | |
277 | */ | |
278 | ||
279 | struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from) | |
280 | { | |
281 | struct list_head * pos; | |
282 | struct pnp_dev * dev; | |
283 | struct pnp_card_driver * drv; | |
284 | struct pnp_card * card; | |
285 | if (!clink || !id) | |
286 | goto done; | |
287 | card = clink->card; | |
288 | drv = clink->driver; | |
289 | if (!from) { | |
290 | pos = card->devices.next; | |
291 | } else { | |
292 | if (from->card != card) | |
293 | goto done; | |
294 | pos = from->card_list.next; | |
295 | } | |
296 | while (pos != &card->devices) { | |
297 | dev = card_to_pnp_dev(pos); | |
298 | if ((!dev->card_link) && compare_pnp_id(dev->id,id)) | |
299 | goto found; | |
300 | pos = pos->next; | |
301 | } | |
302 | ||
303 | done: | |
304 | return NULL; | |
305 | ||
306 | found: | |
307 | down_write(&dev->dev.bus->subsys.rwsem); | |
308 | dev->card_link = clink; | |
309 | dev->dev.driver = &drv->link.driver; | |
8b613e1c AB |
310 | if (pnp_bus_type.probe(&dev->dev)) { |
311 | dev->dev.driver = NULL; | |
312 | dev->card_link = NULL; | |
313 | up_write(&dev->dev.bus->subsys.rwsem); | |
314 | return NULL; | |
1da177e4 LT |
315 | } |
316 | device_bind_driver(&dev->dev); | |
317 | up_write(&dev->dev.bus->subsys.rwsem); | |
318 | ||
319 | return dev; | |
320 | } | |
321 | ||
322 | /** | |
323 | * pnp_release_card_device - call this when the driver no longer needs the device | |
324 | * @dev: pointer to the PnP device stucture | |
325 | */ | |
326 | ||
327 | void pnp_release_card_device(struct pnp_dev * dev) | |
328 | { | |
329 | struct pnp_card_driver * drv = dev->card_link->driver; | |
330 | if (!drv) | |
331 | return; | |
332 | down_write(&dev->dev.bus->subsys.rwsem); | |
333 | drv->link.remove = &card_remove; | |
334 | device_release_driver(&dev->dev); | |
335 | drv->link.remove = &card_remove_first; | |
336 | up_write(&dev->dev.bus->subsys.rwsem); | |
337 | } | |
338 | ||
4c98cfef TI |
339 | /* |
340 | * suspend/resume callbacks | |
341 | */ | |
342 | static int card_suspend(struct pnp_dev *dev, pm_message_t state) | |
343 | { | |
344 | struct pnp_card_link *link = dev->card_link; | |
345 | if (link->pm_state.event == state.event) | |
346 | return 0; | |
347 | link->pm_state = state; | |
348 | return link->driver->suspend(link, state); | |
349 | } | |
350 | ||
351 | static int card_resume(struct pnp_dev *dev) | |
352 | { | |
353 | struct pnp_card_link *link = dev->card_link; | |
354 | if (link->pm_state.event == PM_EVENT_ON) | |
355 | return 0; | |
356 | link->pm_state = PMSG_ON; | |
357 | link->driver->resume(link); | |
358 | return 0; | |
359 | } | |
360 | ||
1da177e4 LT |
361 | /** |
362 | * pnp_register_card_driver - registers a PnP card driver with the PnP Layer | |
363 | * @drv: pointer to the driver to register | |
364 | */ | |
365 | ||
366 | int pnp_register_card_driver(struct pnp_card_driver * drv) | |
367 | { | |
982c6094 | 368 | int error; |
1da177e4 LT |
369 | struct list_head *pos, *temp; |
370 | ||
371 | drv->link.name = drv->name; | |
372 | drv->link.id_table = NULL; /* this will disable auto matching */ | |
373 | drv->link.flags = drv->flags; | |
374 | drv->link.probe = NULL; | |
375 | drv->link.remove = &card_remove_first; | |
4c98cfef TI |
376 | drv->link.suspend = drv->suspend ? card_suspend : NULL; |
377 | drv->link.resume = drv->resume ? card_resume : NULL; | |
1da177e4 | 378 | |
982c6094 BH |
379 | error = pnp_register_driver(&drv->link); |
380 | if (error < 0) | |
381 | return error; | |
d1d051b2 | 382 | |
1da177e4 LT |
383 | spin_lock(&pnp_lock); |
384 | list_add_tail(&drv->global_list, &pnp_card_drivers); | |
385 | spin_unlock(&pnp_lock); | |
d1d051b2 | 386 | |
1da177e4 LT |
387 | list_for_each_safe(pos,temp,&pnp_cards){ |
388 | struct pnp_card *card = list_entry(pos, struct pnp_card, global_list); | |
982c6094 | 389 | card_probe(card,drv); |
1da177e4 | 390 | } |
982c6094 | 391 | return 0; |
1da177e4 LT |
392 | } |
393 | ||
394 | /** | |
395 | * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer | |
396 | * @drv: pointer to the driver to unregister | |
397 | */ | |
398 | ||
399 | void pnp_unregister_card_driver(struct pnp_card_driver * drv) | |
400 | { | |
401 | spin_lock(&pnp_lock); | |
402 | list_del(&drv->global_list); | |
403 | spin_unlock(&pnp_lock); | |
404 | pnp_unregister_driver(&drv->link); | |
405 | } | |
406 | ||
b449f63c | 407 | #if 0 |
1da177e4 LT |
408 | EXPORT_SYMBOL(pnp_add_card); |
409 | EXPORT_SYMBOL(pnp_remove_card); | |
410 | EXPORT_SYMBOL(pnp_add_card_device); | |
411 | EXPORT_SYMBOL(pnp_remove_card_device); | |
412 | EXPORT_SYMBOL(pnp_add_card_id); | |
b449f63c | 413 | #endif /* 0 */ |
1da177e4 LT |
414 | EXPORT_SYMBOL(pnp_request_card_device); |
415 | EXPORT_SYMBOL(pnp_release_card_device); | |
416 | EXPORT_SYMBOL(pnp_register_card_driver); | |
417 | EXPORT_SYMBOL(pnp_unregister_card_driver); |