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
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