Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[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 #include <linux/module.h>
8 #include <linux/ctype.h>
9 #include <linux/slab.h>
10 #include <linux/pnp.h>
11 #include <linux/dma-mapping.h>
12 #include "base.h"
13
14 LIST_HEAD(pnp_cards);
15 static LIST_HEAD(pnp_card_drivers);
16
17 static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
18                                                    struct pnp_card *card)
19 {
20         const struct pnp_card_device_id *drv_id = drv->id_table;
21
22         while (*drv_id->id) {
23                 if (compare_pnp_id(card->id, drv_id->id)) {
24                         int i = 0;
25
26                         for (;;) {
27                                 int found;
28                                 struct pnp_dev *dev;
29
30                                 if (i == PNP_MAX_DEVICES ||
31                                     !*drv_id->devs[i].id)
32                                         return drv_id;
33                                 found = 0;
34                                 card_for_each_dev(card, dev) {
35                                         if (compare_pnp_id(dev->id,
36                                                    drv_id->devs[i].id)) {
37                                                 found = 1;
38                                                 break;
39                                         }
40                                 }
41                                 if (!found)
42                                         break;
43                                 i++;
44                         }
45                 }
46                 drv_id++;
47         }
48         return NULL;
49 }
50
51 static void card_remove(struct pnp_dev *dev)
52 {
53         dev->card_link = NULL;
54 }
55
56 static void card_remove_first(struct pnp_dev *dev)
57 {
58         struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
59
60         if (!dev->card || !drv)
61                 return;
62         if (drv->remove)
63                 drv->remove(dev->card_link);
64         drv->link.remove = &card_remove;
65         kfree(dev->card_link);
66         card_remove(dev);
67 }
68
69 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
70 {
71         const struct pnp_card_device_id *id;
72         struct pnp_card_link *clink;
73         struct pnp_dev *dev;
74
75         if (!drv->probe)
76                 return 0;
77         id = match_card(drv, card);
78         if (!id)
79                 return 0;
80
81         clink = pnp_alloc(sizeof(*clink));
82         if (!clink)
83                 return 0;
84         clink->card = card;
85         clink->driver = drv;
86         clink->pm_state = PMSG_ON;
87
88         if (drv->probe(clink, id) >= 0)
89                 return 1;
90
91         /* Recovery */
92         card_for_each_dev(card, dev) {
93                 if (dev->card_link == clink)
94                         pnp_release_card_device(dev);
95         }
96         kfree(clink);
97         return 0;
98 }
99
100 /**
101  * pnp_add_card_id - adds an EISA id to the specified card
102  * @id: pointer to a pnp_id structure
103  * @card: pointer to the desired card
104  */
105 static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
106 {
107         struct pnp_id *dev_id, *ptr;
108
109         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
110         if (!dev_id)
111                 return NULL;
112
113         dev_id->id[0] = id[0];
114         dev_id->id[1] = id[1];
115         dev_id->id[2] = id[2];
116         dev_id->id[3] = tolower(id[3]);
117         dev_id->id[4] = tolower(id[4]);
118         dev_id->id[5] = tolower(id[5]);
119         dev_id->id[6] = tolower(id[6]);
120         dev_id->id[7] = '\0';
121
122         dev_id->next = NULL;
123         ptr = card->id;
124         while (ptr && ptr->next)
125                 ptr = ptr->next;
126         if (ptr)
127                 ptr->next = dev_id;
128         else
129                 card->id = dev_id;
130
131         return dev_id;
132 }
133
134 static void pnp_free_card_ids(struct pnp_card *card)
135 {
136         struct pnp_id *id;
137         struct pnp_id *next;
138
139         id = card->id;
140         while (id) {
141                 next = id->next;
142                 kfree(id);
143                 id = next;
144         }
145 }
146
147 static void pnp_release_card(struct device *dmdev)
148 {
149         struct pnp_card *card = to_pnp_card(dmdev);
150
151         pnp_free_card_ids(card);
152         kfree(card);
153 }
154
155 struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
156 {
157         struct pnp_card *card;
158         struct pnp_id *dev_id;
159
160         card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
161         if (!card)
162                 return NULL;
163
164         card->protocol = protocol;
165         card->number = id;
166
167         card->dev.parent = &card->protocol->dev;
168         dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
169
170         card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
171         card->dev.dma_mask = &card->dev.coherent_dma_mask;
172
173         dev_id = pnp_add_card_id(card, pnpid);
174         if (!dev_id) {
175                 kfree(card);
176                 return NULL;
177         }
178
179         return card;
180 }
181
182 static ssize_t pnp_show_card_name(struct device *dmdev,
183                                   struct device_attribute *attr, char *buf)
184 {
185         char *str = buf;
186         struct pnp_card *card = to_pnp_card(dmdev);
187
188         str += sprintf(str, "%s\n", card->name);
189         return (str - buf);
190 }
191
192 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
193
194 static ssize_t pnp_show_card_ids(struct device *dmdev,
195                                  struct device_attribute *attr, char *buf)
196 {
197         char *str = buf;
198         struct pnp_card *card = to_pnp_card(dmdev);
199         struct pnp_id *pos = card->id;
200
201         while (pos) {
202                 str += sprintf(str, "%s\n", pos->id);
203                 pos = pos->next;
204         }
205         return (str - buf);
206 }
207
208 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
209
210 static int pnp_interface_attach_card(struct pnp_card *card)
211 {
212         int rc = device_create_file(&card->dev, &dev_attr_name);
213
214         if (rc)
215                 return rc;
216
217         rc = device_create_file(&card->dev, &dev_attr_card_id);
218         if (rc)
219                 goto err_name;
220
221         return 0;
222
223 err_name:
224         device_remove_file(&card->dev, &dev_attr_name);
225         return rc;
226 }
227
228 /**
229  * pnp_add_card - adds a PnP card to the PnP Layer
230  * @card: pointer to the card to add
231  */
232 int pnp_add_card(struct pnp_card *card)
233 {
234         int error;
235         struct list_head *pos, *temp;
236
237         card->dev.bus = NULL;
238         card->dev.release = &pnp_release_card;
239         error = device_register(&card->dev);
240         if (error) {
241                 dev_err(&card->dev, "could not register (err=%d)\n", error);
242                 return error;
243         }
244
245         pnp_interface_attach_card(card);
246         spin_lock(&pnp_lock);
247         list_add_tail(&card->global_list, &pnp_cards);
248         list_add_tail(&card->protocol_list, &card->protocol->cards);
249         spin_unlock(&pnp_lock);
250
251         /* we wait until now to add devices in order to ensure the drivers
252          * will be able to use all of the related devices on the card
253          * without waiting an unreasonable length of time */
254         list_for_each(pos, &card->devices) {
255                 struct pnp_dev *dev = card_to_pnp_dev(pos);
256                 __pnp_add_device(dev);
257         }
258
259         /* match with card drivers */
260         list_for_each_safe(pos, temp, &pnp_card_drivers) {
261                 struct pnp_card_driver *drv =
262                     list_entry(pos, struct pnp_card_driver,
263                                global_list);
264                 card_probe(card, drv);
265         }
266         return 0;
267 }
268
269 /**
270  * pnp_remove_card - removes a PnP card from the PnP Layer
271  * @card: pointer to the card to remove
272  */
273 void pnp_remove_card(struct pnp_card *card)
274 {
275         struct list_head *pos, *temp;
276
277         device_unregister(&card->dev);
278         spin_lock(&pnp_lock);
279         list_del(&card->global_list);
280         list_del(&card->protocol_list);
281         spin_unlock(&pnp_lock);
282         list_for_each_safe(pos, temp, &card->devices) {
283                 struct pnp_dev *dev = card_to_pnp_dev(pos);
284                 pnp_remove_card_device(dev);
285         }
286 }
287
288 /**
289  * pnp_add_card_device - adds a device to the specified card
290  * @card: pointer to the card to add to
291  * @dev: pointer to the device to add
292  */
293 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
294 {
295         dev->dev.parent = &card->dev;
296         dev->card_link = NULL;
297         dev_set_name(&dev->dev, "%02x:%02x.%02x",
298                      dev->protocol->number, card->number, dev->number);
299         spin_lock(&pnp_lock);
300         dev->card = card;
301         list_add_tail(&dev->card_list, &card->devices);
302         spin_unlock(&pnp_lock);
303         return 0;
304 }
305
306 /**
307  * pnp_remove_card_device- removes a device from the specified card
308  * @dev: pointer to the device to remove
309  */
310 void pnp_remove_card_device(struct pnp_dev *dev)
311 {
312         spin_lock(&pnp_lock);
313         dev->card = NULL;
314         list_del(&dev->card_list);
315         spin_unlock(&pnp_lock);
316         __pnp_remove_device(dev);
317 }
318
319 /**
320  * pnp_request_card_device - Searches for a PnP device under the specified card
321  * @clink: pointer to the card link, cannot be NULL
322  * @id: pointer to a PnP ID structure that explains the rules for finding the device
323  * @from: Starting place to search from. If NULL it will start from the begining.
324  */
325 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
326                                         const char *id, struct pnp_dev *from)
327 {
328         struct list_head *pos;
329         struct pnp_dev *dev;
330         struct pnp_card_driver *drv;
331         struct pnp_card *card;
332
333         if (!clink || !id)
334                 return NULL;
335
336         card = clink->card;
337         drv = clink->driver;
338         if (!from) {
339                 pos = card->devices.next;
340         } else {
341                 if (from->card != card)
342                         return NULL;
343                 pos = from->card_list.next;
344         }
345         while (pos != &card->devices) {
346                 dev = card_to_pnp_dev(pos);
347                 if ((!dev->card_link) && compare_pnp_id(dev->id, id))
348                         goto found;
349                 pos = pos->next;
350         }
351
352         return NULL;
353
354 found:
355         dev->card_link = clink;
356         dev->dev.driver = &drv->link.driver;
357         if (pnp_bus_type.probe(&dev->dev))
358                 goto err_out;
359         if (device_bind_driver(&dev->dev))
360                 goto err_out;
361
362         return dev;
363
364 err_out:
365         dev->dev.driver = NULL;
366         dev->card_link = NULL;
367         return NULL;
368 }
369
370 /**
371  * pnp_release_card_device - call this when the driver no longer needs the device
372  * @dev: pointer to the PnP device stucture
373  */
374 void pnp_release_card_device(struct pnp_dev *dev)
375 {
376         struct pnp_card_driver *drv = dev->card_link->driver;
377
378         drv->link.remove = &card_remove;
379         device_release_driver(&dev->dev);
380         drv->link.remove = &card_remove_first;
381 }
382
383 /*
384  * suspend/resume callbacks
385  */
386 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
387 {
388         struct pnp_card_link *link = dev->card_link;
389
390         if (link->pm_state.event == state.event)
391                 return 0;
392         link->pm_state = state;
393         return link->driver->suspend(link, state);
394 }
395
396 static int card_resume(struct pnp_dev *dev)
397 {
398         struct pnp_card_link *link = dev->card_link;
399
400         if (link->pm_state.event == PM_EVENT_ON)
401                 return 0;
402         link->pm_state = PMSG_ON;
403         link->driver->resume(link);
404         return 0;
405 }
406
407 /**
408  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
409  * @drv: pointer to the driver to register
410  */
411 int pnp_register_card_driver(struct pnp_card_driver *drv)
412 {
413         int error;
414         struct list_head *pos, *temp;
415
416         drv->link.name = drv->name;
417         drv->link.id_table = NULL;      /* this will disable auto matching */
418         drv->link.flags = drv->flags;
419         drv->link.probe = NULL;
420         drv->link.remove = &card_remove_first;
421         drv->link.suspend = drv->suspend ? card_suspend : NULL;
422         drv->link.resume = drv->resume ? card_resume : NULL;
423
424         error = pnp_register_driver(&drv->link);
425         if (error < 0)
426                 return error;
427
428         spin_lock(&pnp_lock);
429         list_add_tail(&drv->global_list, &pnp_card_drivers);
430         spin_unlock(&pnp_lock);
431
432         list_for_each_safe(pos, temp, &pnp_cards) {
433                 struct pnp_card *card =
434                     list_entry(pos, struct pnp_card, global_list);
435                 card_probe(card, drv);
436         }
437         return 0;
438 }
439
440 /**
441  * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
442  * @drv: pointer to the driver to unregister
443  */
444 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
445 {
446         spin_lock(&pnp_lock);
447         list_del(&drv->global_list);
448         spin_unlock(&pnp_lock);
449         pnp_unregister_driver(&drv->link);
450 }
451
452 EXPORT_SYMBOL(pnp_request_card_device);
453 EXPORT_SYMBOL(pnp_release_card_device);
454 EXPORT_SYMBOL(pnp_register_card_driver);
455 EXPORT_SYMBOL(pnp_unregister_card_driver);