PNP: fix up after Lindent
[linux-2.6.git] / drivers / pnp / card.c
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         if (!id)
108                 return -EINVAL;
109         if (!card)
110                 return -EINVAL;
111         id->next = NULL;
112         ptr = card->id;
113         while (ptr && ptr->next)
114                 ptr = ptr->next;
115         if (ptr)
116                 ptr->next = id;
117         else
118                 card->id = id;
119         return 0;
120 }
121
122 static void pnp_free_card_ids(struct pnp_card *card)
123 {
124         struct pnp_id *id;
125         struct pnp_id *next;
126
127         if (!card)
128                 return;
129         id = card->id;
130         while (id) {
131                 next = id->next;
132                 kfree(id);
133                 id = next;
134         }
135 }
136
137 static void pnp_release_card(struct device *dmdev)
138 {
139         struct pnp_card *card = to_pnp_card(dmdev);
140
141         pnp_free_card_ids(card);
142         kfree(card);
143 }
144
145 static ssize_t pnp_show_card_name(struct device *dmdev,
146                                   struct device_attribute *attr, char *buf)
147 {
148         char *str = buf;
149         struct pnp_card *card = to_pnp_card(dmdev);
150
151         str += sprintf(str, "%s\n", card->name);
152         return (str - buf);
153 }
154
155 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
156
157 static ssize_t pnp_show_card_ids(struct device *dmdev,
158                                  struct device_attribute *attr, char *buf)
159 {
160         char *str = buf;
161         struct pnp_card *card = to_pnp_card(dmdev);
162         struct pnp_id *pos = card->id;
163
164         while (pos) {
165                 str += sprintf(str, "%s\n", pos->id);
166                 pos = pos->next;
167         }
168         return (str - buf);
169 }
170
171 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
172
173 static int pnp_interface_attach_card(struct pnp_card *card)
174 {
175         int rc = device_create_file(&card->dev, &dev_attr_name);
176
177         if (rc)
178                 return rc;
179
180         rc = device_create_file(&card->dev, &dev_attr_card_id);
181         if (rc)
182                 goto err_name;
183
184         return 0;
185
186 err_name:
187         device_remove_file(&card->dev, &dev_attr_name);
188         return rc;
189 }
190
191 /**
192  * pnp_add_card - adds a PnP card to the PnP Layer
193  * @card: pointer to the card to add
194  */
195 int pnp_add_card(struct pnp_card *card)
196 {
197         int error;
198         struct list_head *pos, *temp;
199
200         if (!card || !card->protocol)
201                 return -EINVAL;
202
203         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
204                 card->number);
205         card->dev.parent = &card->protocol->dev;
206         card->dev.bus = NULL;
207         card->dev.release = &pnp_release_card;
208         error = device_register(&card->dev);
209
210         if (error == 0) {
211                 pnp_interface_attach_card(card);
212                 spin_lock(&pnp_lock);
213                 list_add_tail(&card->global_list, &pnp_cards);
214                 list_add_tail(&card->protocol_list, &card->protocol->cards);
215                 spin_unlock(&pnp_lock);
216
217                 /* we wait until now to add devices in order to ensure the drivers
218                  * will be able to use all of the related devices on the card
219                  * without waiting any unresonable length of time */
220                 list_for_each(pos, &card->devices) {
221                         struct pnp_dev *dev = card_to_pnp_dev(pos);
222                         __pnp_add_device(dev);
223                 }
224
225                 /* match with card drivers */
226                 list_for_each_safe(pos, temp, &pnp_card_drivers) {
227                         struct pnp_card_driver *drv =
228                             list_entry(pos, struct pnp_card_driver,
229                                        global_list);
230                         card_probe(card, drv);
231                 }
232         } else
233                 pnp_err("sysfs failure, card '%s' will be unavailable",
234                         card->dev.bus_id);
235         return error;
236 }
237
238 /**
239  * pnp_remove_card - removes a PnP card from the PnP Layer
240  * @card: pointer to the card to remove
241  */
242 void pnp_remove_card(struct pnp_card *card)
243 {
244         struct list_head *pos, *temp;
245
246         if (!card)
247                 return;
248         device_unregister(&card->dev);
249         spin_lock(&pnp_lock);
250         list_del(&card->global_list);
251         list_del(&card->protocol_list);
252         spin_unlock(&pnp_lock);
253         list_for_each_safe(pos, temp, &card->devices) {
254                 struct pnp_dev *dev = card_to_pnp_dev(pos);
255                 pnp_remove_card_device(dev);
256         }
257 }
258
259 /**
260  * pnp_add_card_device - adds a device to the specified card
261  * @card: pointer to the card to add to
262  * @dev: pointer to the device to add
263  */
264 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
265 {
266         if (!card || !dev || !dev->protocol)
267                 return -EINVAL;
268         dev->dev.parent = &card->dev;
269         dev->card_link = NULL;
270         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
271                  dev->protocol->number, card->number, dev->number);
272         spin_lock(&pnp_lock);
273         dev->card = card;
274         list_add_tail(&dev->card_list, &card->devices);
275         spin_unlock(&pnp_lock);
276         return 0;
277 }
278
279 /**
280  * pnp_remove_card_device- removes a device from the specified card
281  * @dev: pointer to the device to remove
282  */
283 void pnp_remove_card_device(struct pnp_dev *dev)
284 {
285         spin_lock(&pnp_lock);
286         dev->card = NULL;
287         list_del(&dev->card_list);
288         spin_unlock(&pnp_lock);
289         __pnp_remove_device(dev);
290 }
291
292 /**
293  * pnp_request_card_device - Searches for a PnP device under the specified card
294  * @clink: pointer to the card link, cannot be NULL
295  * @id: pointer to a PnP ID structure that explains the rules for finding the device
296  * @from: Starting place to search from. If NULL it will start from the begining.
297  */
298 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
299                                         const char *id, struct pnp_dev *from)
300 {
301         struct list_head *pos;
302         struct pnp_dev *dev;
303         struct pnp_card_driver *drv;
304         struct pnp_card *card;
305
306         if (!clink || !id)
307                 goto done;
308         card = clink->card;
309         drv = clink->driver;
310         if (!from) {
311                 pos = card->devices.next;
312         } else {
313                 if (from->card != card)
314                         goto done;
315                 pos = from->card_list.next;
316         }
317         while (pos != &card->devices) {
318                 dev = card_to_pnp_dev(pos);
319                 if ((!dev->card_link) && compare_pnp_id(dev->id, id))
320                         goto found;
321                 pos = pos->next;
322         }
323
324 done:
325         return NULL;
326
327 found:
328         dev->card_link = clink;
329         dev->dev.driver = &drv->link.driver;
330         if (pnp_bus_type.probe(&dev->dev))
331                 goto err_out;
332         if (device_bind_driver(&dev->dev))
333                 goto err_out;
334
335         return dev;
336
337 err_out:
338         dev->dev.driver = NULL;
339         dev->card_link = NULL;
340         return NULL;
341 }
342
343 /**
344  * pnp_release_card_device - call this when the driver no longer needs the device
345  * @dev: pointer to the PnP device stucture
346  */
347 void pnp_release_card_device(struct pnp_dev *dev)
348 {
349         struct pnp_card_driver *drv = dev->card_link->driver;
350
351         if (!drv)
352                 return;
353         drv->link.remove = &card_remove;
354         device_release_driver(&dev->dev);
355         drv->link.remove = &card_remove_first;
356 }
357
358 /*
359  * suspend/resume callbacks
360  */
361 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
362 {
363         struct pnp_card_link *link = dev->card_link;
364
365         if (link->pm_state.event == state.event)
366                 return 0;
367         link->pm_state = state;
368         return link->driver->suspend(link, state);
369 }
370
371 static int card_resume(struct pnp_dev *dev)
372 {
373         struct pnp_card_link *link = dev->card_link;
374
375         if (link->pm_state.event == PM_EVENT_ON)
376                 return 0;
377         link->pm_state = PMSG_ON;
378         link->driver->resume(link);
379         return 0;
380 }
381
382 /**
383  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
384  * @drv: pointer to the driver to register
385  */
386 int pnp_register_card_driver(struct pnp_card_driver *drv)
387 {
388         int error;
389         struct list_head *pos, *temp;
390
391         drv->link.name = drv->name;
392         drv->link.id_table = NULL;      /* this will disable auto matching */
393         drv->link.flags = drv->flags;
394         drv->link.probe = NULL;
395         drv->link.remove = &card_remove_first;
396         drv->link.suspend = drv->suspend ? card_suspend : NULL;
397         drv->link.resume = drv->resume ? card_resume : NULL;
398
399         error = pnp_register_driver(&drv->link);
400         if (error < 0)
401                 return error;
402
403         spin_lock(&pnp_lock);
404         list_add_tail(&drv->global_list, &pnp_card_drivers);
405         spin_unlock(&pnp_lock);
406
407         list_for_each_safe(pos, temp, &pnp_cards) {
408                 struct pnp_card *card =
409                     list_entry(pos, struct pnp_card, global_list);
410                 card_probe(card, drv);
411         }
412         return 0;
413 }
414
415 /**
416  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
417  * @drv: pointer to the driver to unregister
418  */
419 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
420 {
421         spin_lock(&pnp_lock);
422         list_del(&drv->global_list);
423         spin_unlock(&pnp_lock);
424         pnp_unregister_driver(&drv->link);
425 }
426
427 EXPORT_SYMBOL(pnp_request_card_device);
428 EXPORT_SYMBOL(pnp_release_card_device);
429 EXPORT_SYMBOL(pnp_register_card_driver);
430 EXPORT_SYMBOL(pnp_unregister_card_driver);