[PATCH] broken error path in drivers/pnp/card.c
[linux-2.6] / 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
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
143 static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf)
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
153 static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf)
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
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
276  * @clink: pointer to the card link, cannot be NULL
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                         dev->card_link = NULL;
316                         up_write(&dev->dev.bus->subsys.rwsem);
317                         return NULL;
318                 }
319         }
320         device_bind_driver(&dev->dev);
321         up_write(&dev->dev.bus->subsys.rwsem);
322
323         return dev;
324 }
325
326 /**
327  * pnp_release_card_device - call this when the driver no longer needs the device
328  * @dev: pointer to the PnP device stucture
329  */
330
331 void pnp_release_card_device(struct pnp_dev * dev)
332 {
333         struct pnp_card_driver * drv = dev->card_link->driver;
334         if (!drv)
335                 return;
336         down_write(&dev->dev.bus->subsys.rwsem);
337         drv->link.remove = &card_remove;
338         device_release_driver(&dev->dev);
339         drv->link.remove = &card_remove_first;
340         up_write(&dev->dev.bus->subsys.rwsem);
341 }
342
343 /**
344  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
345  * @drv: pointer to the driver to register
346  */
347
348 int pnp_register_card_driver(struct pnp_card_driver * drv)
349 {
350         int count = 0;
351         struct list_head *pos, *temp;
352
353         drv->link.name = drv->name;
354         drv->link.id_table = NULL;      /* this will disable auto matching */
355         drv->link.flags = drv->flags;
356         drv->link.probe = NULL;
357         drv->link.remove = &card_remove_first;
358
359         spin_lock(&pnp_lock);
360         list_add_tail(&drv->global_list, &pnp_card_drivers);
361         spin_unlock(&pnp_lock);
362         pnp_register_driver(&drv->link);
363
364         list_for_each_safe(pos,temp,&pnp_cards){
365                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
366                 count += card_probe(card,drv);
367         }
368         return count;
369 }
370
371 /**
372  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
373  * @drv: pointer to the driver to unregister
374  */
375
376 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
377 {
378         spin_lock(&pnp_lock);
379         list_del(&drv->global_list);
380         spin_unlock(&pnp_lock);
381         pnp_unregister_driver(&drv->link);
382 }
383
384 EXPORT_SYMBOL(pnp_add_card);
385 EXPORT_SYMBOL(pnp_remove_card);
386 EXPORT_SYMBOL(pnp_add_card_device);
387 EXPORT_SYMBOL(pnp_remove_card_device);
388 EXPORT_SYMBOL(pnp_add_card_id);
389 EXPORT_SYMBOL(pnp_request_card_device);
390 EXPORT_SYMBOL(pnp_release_card_device);
391 EXPORT_SYMBOL(pnp_register_card_driver);
392 EXPORT_SYMBOL(pnp_unregister_card_driver);