[SCSI] iscsi: bump version to 2.0-868
[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/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);