[PATCH] pnp bus type fix
[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
8 #include <linux/config.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/pnp.h>
12 #include "base.h"
13
14 LIST_HEAD(pnp_cards);
15 static LIST_HEAD(pnp_card_drivers);
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 }
50  
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
63 static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv)
64 {
65         const struct pnp_card_device_id *id = match_card(drv,card);
66         if (id) {
67                 struct pnp_card_link * clink = pnp_alloc(sizeof(struct pnp_card_link));
68                 if (!clink)
69                         return 0;
70                 clink->card = card;
71                 clink->driver = drv;
72                 clink->pm_state = PMSG_ON;
73                 if (drv->probe) {
74                         if (drv->probe(clink, id)>=0)
75                                 return 1;
76                         else {
77                                 struct pnp_dev * dev;
78                                 card_for_each_dev(card, dev) {
79                                         if (dev->card_link == clink)
80                                                 pnp_release_card_device(dev);
81                                 }
82                                 kfree(clink);
83                         }
84                 } else
85                         return 1;
86         }
87         return 0;
88 }
89
90 /**
91  * pnp_add_card_id - adds an EISA id to the specified card
92  * @id: pointer to a pnp_id structure
93  * @card: pointer to the desired card
94  *
95  */
96
97 int pnp_add_card_id(struct pnp_id *id, struct pnp_card * card)
98 {
99         struct pnp_id * ptr;
100         if (!id)
101                 return -EINVAL;
102         if (!card)
103                 return -EINVAL;
104         id->next = NULL;
105         ptr = card->id;
106         while (ptr && ptr->next)
107                 ptr = ptr->next;
108         if (ptr)
109                 ptr->next = id;
110         else
111                 card->id = id;
112         return 0;
113 }
114
115 static void pnp_free_card_ids(struct pnp_card * card)
116 {
117         struct pnp_id * id;
118         struct pnp_id *next;
119         if (!card)
120                 return;
121         id = card->id;
122         while (id) {
123                 next = id->next;
124                 kfree(id);
125                 id = next;
126         }
127 }
128
129 static void pnp_release_card(struct device *dmdev)
130 {
131         struct pnp_card * card = to_pnp_card(dmdev);
132         pnp_free_card_ids(card);
133         kfree(card);
134 }
135
136
137 static ssize_t pnp_show_card_name(struct device *dmdev, struct device_attribute *attr, char *buf)
138 {
139         char *str = buf;
140         struct pnp_card *card = to_pnp_card(dmdev);
141         str += sprintf(str,"%s\n", card->name);
142         return (str - buf);
143 }
144
145 static DEVICE_ATTR(name,S_IRUGO,pnp_show_card_name,NULL);
146
147 static ssize_t pnp_show_card_ids(struct device *dmdev, struct device_attribute *attr, char *buf)
148 {
149         char *str = buf;
150         struct pnp_card *card = to_pnp_card(dmdev);
151         struct pnp_id * pos = card->id;
152
153         while (pos) {
154                 str += sprintf(str,"%s\n", pos->id);
155                 pos = pos->next;
156         }
157         return (str - buf);
158 }
159
160 static DEVICE_ATTR(card_id,S_IRUGO,pnp_show_card_ids,NULL);
161
162 static int pnp_interface_attach_card(struct pnp_card *card)
163 {
164         device_create_file(&card->dev,&dev_attr_name);
165         device_create_file(&card->dev,&dev_attr_card_id);
166         return 0;
167 }
168
169 /**
170  * pnp_add_card - adds a PnP card to the PnP Layer
171  * @card: pointer to the card to add
172  */
173
174 int pnp_add_card(struct pnp_card * card)
175 {
176         int error;
177         struct list_head * pos, * temp;
178         if (!card || !card->protocol)
179                 return -EINVAL;
180
181         sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number, card->number);
182         card->dev.parent = &card->protocol->dev;
183         card->dev.bus = NULL;
184         card->dev.release = &pnp_release_card;
185         error = device_register(&card->dev);
186
187         if (error == 0) {
188                 pnp_interface_attach_card(card);
189                 spin_lock(&pnp_lock);
190                 list_add_tail(&card->global_list, &pnp_cards);
191                 list_add_tail(&card->protocol_list, &card->protocol->cards);
192                 spin_unlock(&pnp_lock);
193
194                 /* we wait until now to add devices in order to ensure the drivers
195                  * will be able to use all of the related devices on the card
196                  * without waiting any unresonable length of time */
197                 list_for_each(pos,&card->devices){
198                         struct pnp_dev *dev = card_to_pnp_dev(pos);
199                         __pnp_add_device(dev);
200                 }
201
202                 /* match with card drivers */
203                 list_for_each_safe(pos,temp,&pnp_card_drivers){
204                         struct pnp_card_driver * drv = list_entry(pos, struct pnp_card_driver, global_list);
205                         card_probe(card,drv);
206                 }
207         } else
208                 pnp_err("sysfs failure, card '%s' will be unavailable", card->dev.bus_id);
209         return error;
210 }
211
212 /**
213  * pnp_remove_card - removes a PnP card from the PnP Layer
214  * @card: pointer to the card to remove
215  */
216
217 void pnp_remove_card(struct pnp_card * card)
218 {
219         struct list_head *pos, *temp;
220         if (!card)
221                 return;
222         device_unregister(&card->dev);
223         spin_lock(&pnp_lock);
224         list_del(&card->global_list);
225         list_del(&card->protocol_list);
226         spin_unlock(&pnp_lock);
227         list_for_each_safe(pos,temp,&card->devices){
228                 struct pnp_dev *dev = card_to_pnp_dev(pos);
229                 pnp_remove_card_device(dev);
230         }
231 }
232
233 /**
234  * pnp_add_card_device - adds a device to the specified card
235  * @card: pointer to the card to add to
236  * @dev: pointer to the device to add
237  */
238
239 int pnp_add_card_device(struct pnp_card * card, struct pnp_dev * dev)
240 {
241         if (!card || !dev || !dev->protocol)
242                 return -EINVAL;
243         dev->dev.parent = &card->dev;
244         dev->card_link = NULL;
245         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x", dev->protocol->number,
246                  card->number,dev->number);
247         spin_lock(&pnp_lock);
248         dev->card = card;
249         list_add_tail(&dev->card_list, &card->devices);
250         spin_unlock(&pnp_lock);
251         return 0;
252 }
253
254 /**
255  * pnp_remove_card_device- removes a device from the specified card
256  * @dev: pointer to the device to remove
257  */
258
259 void pnp_remove_card_device(struct pnp_dev * dev)
260 {
261         spin_lock(&pnp_lock);
262         dev->card = NULL;
263         list_del(&dev->card_list);
264         spin_unlock(&pnp_lock);
265         __pnp_remove_device(dev);
266 }
267
268 /**
269  * pnp_request_card_device - Searches for a PnP device under the specified card
270  * @clink: pointer to the card link, cannot be NULL
271  * @id: pointer to a PnP ID structure that explains the rules for finding the device
272  * @from: Starting place to search from. If NULL it will start from the begining.
273  */
274
275 struct pnp_dev * pnp_request_card_device(struct pnp_card_link *clink, const char * id, struct pnp_dev * from)
276 {
277         struct list_head * pos;
278         struct pnp_dev * dev;
279         struct pnp_card_driver * drv;
280         struct pnp_card * card;
281         if (!clink || !id)
282                 goto done;
283         card = clink->card;
284         drv = clink->driver;
285         if (!from) {
286                 pos = card->devices.next;
287         } else {
288                 if (from->card != card)
289                         goto done;
290                 pos = from->card_list.next;
291         }
292         while (pos != &card->devices) {
293                 dev = card_to_pnp_dev(pos);
294                 if ((!dev->card_link) && compare_pnp_id(dev->id,id))
295                         goto found;
296                 pos = pos->next;
297         }
298
299 done:
300         return NULL;
301
302 found:
303         down_write(&dev->dev.bus->subsys.rwsem);
304         dev->card_link = clink;
305         dev->dev.driver = &drv->link.driver;
306         if (pnp_bus_type.probe(&dev->dev)) {
307                 dev->dev.driver = NULL;
308                 dev->card_link = NULL;
309                 up_write(&dev->dev.bus->subsys.rwsem);
310                 return NULL;
311         }
312         device_bind_driver(&dev->dev);
313         up_write(&dev->dev.bus->subsys.rwsem);
314
315         return dev;
316 }
317
318 /**
319  * pnp_release_card_device - call this when the driver no longer needs the device
320  * @dev: pointer to the PnP device stucture
321  */
322
323 void pnp_release_card_device(struct pnp_dev * dev)
324 {
325         struct pnp_card_driver * drv = dev->card_link->driver;
326         if (!drv)
327                 return;
328         down_write(&dev->dev.bus->subsys.rwsem);
329         drv->link.remove = &card_remove;
330         device_release_driver(&dev->dev);
331         drv->link.remove = &card_remove_first;
332         up_write(&dev->dev.bus->subsys.rwsem);
333 }
334
335 /*
336  * suspend/resume callbacks
337  */
338 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
339 {
340         struct pnp_card_link *link = dev->card_link;
341         if (link->pm_state.event == state.event)
342                 return 0;
343         link->pm_state = state;
344         return link->driver->suspend(link, state);
345 }
346
347 static int card_resume(struct pnp_dev *dev)
348 {
349         struct pnp_card_link *link = dev->card_link;
350         if (link->pm_state.event == PM_EVENT_ON)
351                 return 0;
352         link->pm_state = PMSG_ON;
353         link->driver->resume(link);
354         return 0;
355 }
356
357 /**
358  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
359  * @drv: pointer to the driver to register
360  */
361
362 int pnp_register_card_driver(struct pnp_card_driver * drv)
363 {
364         int count;
365         struct list_head *pos, *temp;
366
367         drv->link.name = drv->name;
368         drv->link.id_table = NULL;      /* this will disable auto matching */
369         drv->link.flags = drv->flags;
370         drv->link.probe = NULL;
371         drv->link.remove = &card_remove_first;
372         drv->link.suspend = drv->suspend ? card_suspend : NULL;
373         drv->link.resume = drv->resume ? card_resume : NULL;
374
375         count = pnp_register_driver(&drv->link);
376         if (count < 0)
377                 return count;
378
379         spin_lock(&pnp_lock);
380         list_add_tail(&drv->global_list, &pnp_card_drivers);
381         spin_unlock(&pnp_lock);
382
383         count = 0;
384
385         list_for_each_safe(pos,temp,&pnp_cards){
386                 struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);
387                 count += card_probe(card,drv);
388         }
389         return count;
390 }
391
392 /**
393  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
394  * @drv: pointer to the driver to unregister
395  */
396
397 void pnp_unregister_card_driver(struct pnp_card_driver * drv)
398 {
399         spin_lock(&pnp_lock);
400         list_del(&drv->global_list);
401         spin_unlock(&pnp_lock);
402         pnp_unregister_driver(&drv->link);
403 }
404
405 #if 0
406 EXPORT_SYMBOL(pnp_add_card);
407 EXPORT_SYMBOL(pnp_remove_card);
408 EXPORT_SYMBOL(pnp_add_card_device);
409 EXPORT_SYMBOL(pnp_remove_card_device);
410 EXPORT_SYMBOL(pnp_add_card_id);
411 #endif  /*  0  */
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);