signals: dequeue_signal: don't check SIGNAL_GROUP_EXIT when setting SIGNAL_STOP_DEQUEUED
[linux-2.6/mini2440.git] / drivers / pnp / card.c
bloba762a4176736fcc5aa3e5d3ce4016ca921bcabbd
1 /*
2 * card.c - contains functions for managing groups of PnP devices
4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
5 */
7 #include <linux/module.h>
8 #include <linux/ctype.h>
9 #include <linux/slab.h>
10 #include <linux/pnp.h>
11 #include "base.h"
13 LIST_HEAD(pnp_cards);
14 static LIST_HEAD(pnp_card_drivers);
16 static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
17 struct pnp_card *card)
19 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;
25 for (;;) {
26 int found;
27 struct pnp_dev *dev;
29 if (i == PNP_MAX_DEVICES ||
30 !*drv_id->devs[i].id)
31 return drv_id;
32 found = 0;
33 card_for_each_dev(card, dev) {
34 if (compare_pnp_id(dev->id,
35 drv_id->devs[i].id)) {
36 found = 1;
37 break;
40 if (!found)
41 break;
42 i++;
45 drv_id++;
47 return NULL;
50 static void card_remove(struct pnp_dev *dev)
52 dev->card_link = NULL;
55 static void card_remove_first(struct pnp_dev *dev)
57 struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
59 if (!dev->card || !drv)
60 return;
61 if (drv->remove)
62 drv->remove(dev->card_link);
63 drv->link.remove = &card_remove;
64 kfree(dev->card_link);
65 card_remove(dev);
68 static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
70 const struct pnp_card_device_id *id;
71 struct pnp_card_link *clink;
72 struct pnp_dev *dev;
74 if (!drv->probe)
75 return 0;
76 id = match_card(drv, card);
77 if (!id)
78 return 0;
80 clink = pnp_alloc(sizeof(*clink));
81 if (!clink)
82 return 0;
83 clink->card = card;
84 clink->driver = drv;
85 clink->pm_state = PMSG_ON;
87 if (drv->probe(clink, id) >= 0)
88 return 1;
90 /* Recovery */
91 card_for_each_dev(card, dev) {
92 if (dev->card_link == clink)
93 pnp_release_card_device(dev);
95 kfree(clink);
96 return 0;
99 /**
100 * pnp_add_card_id - adds an EISA id to the specified card
101 * @id: pointer to a pnp_id structure
102 * @card: pointer to the desired card
104 struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
106 struct pnp_id *dev_id, *ptr;
108 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
109 if (!dev_id)
110 return NULL;
112 dev_id->id[0] = id[0];
113 dev_id->id[1] = id[1];
114 dev_id->id[2] = id[2];
115 dev_id->id[3] = tolower(id[3]);
116 dev_id->id[4] = tolower(id[4]);
117 dev_id->id[5] = tolower(id[5]);
118 dev_id->id[6] = tolower(id[6]);
119 dev_id->id[7] = '\0';
121 dev_id->next = NULL;
122 ptr = card->id;
123 while (ptr && ptr->next)
124 ptr = ptr->next;
125 if (ptr)
126 ptr->next = dev_id;
127 else
128 card->id = dev_id;
130 return dev_id;
133 static void pnp_free_card_ids(struct pnp_card *card)
135 struct pnp_id *id;
136 struct pnp_id *next;
138 id = card->id;
139 while (id) {
140 next = id->next;
141 kfree(id);
142 id = next;
146 static void pnp_release_card(struct device *dmdev)
148 struct pnp_card *card = to_pnp_card(dmdev);
150 pnp_free_card_ids(card);
151 kfree(card);
154 struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
156 struct pnp_card *card;
157 struct pnp_id *dev_id;
159 card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
160 if (!card)
161 return NULL;
163 card->protocol = protocol;
164 card->number = id;
166 card->dev.parent = &card->protocol->dev;
167 sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
168 card->number);
170 dev_id = pnp_add_card_id(card, pnpid);
171 if (!dev_id) {
172 kfree(card);
173 return NULL;
176 return card;
179 static ssize_t pnp_show_card_name(struct device *dmdev,
180 struct device_attribute *attr, char *buf)
182 char *str = buf;
183 struct pnp_card *card = to_pnp_card(dmdev);
185 str += sprintf(str, "%s\n", card->name);
186 return (str - buf);
189 static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
191 static ssize_t pnp_show_card_ids(struct device *dmdev,
192 struct device_attribute *attr, char *buf)
194 char *str = buf;
195 struct pnp_card *card = to_pnp_card(dmdev);
196 struct pnp_id *pos = card->id;
198 while (pos) {
199 str += sprintf(str, "%s\n", pos->id);
200 pos = pos->next;
202 return (str - buf);
205 static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
207 static int pnp_interface_attach_card(struct pnp_card *card)
209 int rc = device_create_file(&card->dev, &dev_attr_name);
211 if (rc)
212 return rc;
214 rc = device_create_file(&card->dev, &dev_attr_card_id);
215 if (rc)
216 goto err_name;
218 return 0;
220 err_name:
221 device_remove_file(&card->dev, &dev_attr_name);
222 return rc;
226 * pnp_add_card - adds a PnP card to the PnP Layer
227 * @card: pointer to the card to add
229 int pnp_add_card(struct pnp_card *card)
231 int error;
232 struct list_head *pos, *temp;
234 card->dev.bus = NULL;
235 card->dev.release = &pnp_release_card;
236 error = device_register(&card->dev);
237 if (error) {
238 dev_err(&card->dev, "could not register (err=%d)\n", error);
239 return error;
242 pnp_interface_attach_card(card);
243 spin_lock(&pnp_lock);
244 list_add_tail(&card->global_list, &pnp_cards);
245 list_add_tail(&card->protocol_list, &card->protocol->cards);
246 spin_unlock(&pnp_lock);
248 /* we wait until now to add devices in order to ensure the drivers
249 * will be able to use all of the related devices on the card
250 * without waiting an unreasonable length of time */
251 list_for_each(pos, &card->devices) {
252 struct pnp_dev *dev = card_to_pnp_dev(pos);
253 __pnp_add_device(dev);
256 /* match with card drivers */
257 list_for_each_safe(pos, temp, &pnp_card_drivers) {
258 struct pnp_card_driver *drv =
259 list_entry(pos, struct pnp_card_driver,
260 global_list);
261 card_probe(card, drv);
263 return 0;
267 * pnp_remove_card - removes a PnP card from the PnP Layer
268 * @card: pointer to the card to remove
270 void pnp_remove_card(struct pnp_card *card)
272 struct list_head *pos, *temp;
274 device_unregister(&card->dev);
275 spin_lock(&pnp_lock);
276 list_del(&card->global_list);
277 list_del(&card->protocol_list);
278 spin_unlock(&pnp_lock);
279 list_for_each_safe(pos, temp, &card->devices) {
280 struct pnp_dev *dev = card_to_pnp_dev(pos);
281 pnp_remove_card_device(dev);
286 * pnp_add_card_device - adds a device to the specified card
287 * @card: pointer to the card to add to
288 * @dev: pointer to the device to add
290 int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
292 dev->dev.parent = &card->dev;
293 dev->card_link = NULL;
294 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%02x:%02x.%02x",
295 dev->protocol->number, card->number, dev->number);
296 spin_lock(&pnp_lock);
297 dev->card = card;
298 list_add_tail(&dev->card_list, &card->devices);
299 spin_unlock(&pnp_lock);
300 return 0;
304 * pnp_remove_card_device- removes a device from the specified card
305 * @dev: pointer to the device to remove
307 void pnp_remove_card_device(struct pnp_dev *dev)
309 spin_lock(&pnp_lock);
310 dev->card = NULL;
311 list_del(&dev->card_list);
312 spin_unlock(&pnp_lock);
313 __pnp_remove_device(dev);
317 * pnp_request_card_device - Searches for a PnP device under the specified card
318 * @clink: pointer to the card link, cannot be NULL
319 * @id: pointer to a PnP ID structure that explains the rules for finding the device
320 * @from: Starting place to search from. If NULL it will start from the begining.
322 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
323 const char *id, struct pnp_dev *from)
325 struct list_head *pos;
326 struct pnp_dev *dev;
327 struct pnp_card_driver *drv;
328 struct pnp_card *card;
330 if (!clink || !id)
331 return NULL;
333 card = clink->card;
334 drv = clink->driver;
335 if (!from) {
336 pos = card->devices.next;
337 } else {
338 if (from->card != card)
339 return NULL;
340 pos = from->card_list.next;
342 while (pos != &card->devices) {
343 dev = card_to_pnp_dev(pos);
344 if ((!dev->card_link) && compare_pnp_id(dev->id, id))
345 goto found;
346 pos = pos->next;
349 return NULL;
351 found:
352 dev->card_link = clink;
353 dev->dev.driver = &drv->link.driver;
354 if (pnp_bus_type.probe(&dev->dev))
355 goto err_out;
356 if (device_bind_driver(&dev->dev))
357 goto err_out;
359 return dev;
361 err_out:
362 dev->dev.driver = NULL;
363 dev->card_link = NULL;
364 return NULL;
368 * pnp_release_card_device - call this when the driver no longer needs the device
369 * @dev: pointer to the PnP device stucture
371 void pnp_release_card_device(struct pnp_dev *dev)
373 struct pnp_card_driver *drv = dev->card_link->driver;
375 drv->link.remove = &card_remove;
376 device_release_driver(&dev->dev);
377 drv->link.remove = &card_remove_first;
381 * suspend/resume callbacks
383 static int card_suspend(struct pnp_dev *dev, pm_message_t state)
385 struct pnp_card_link *link = dev->card_link;
387 if (link->pm_state.event == state.event)
388 return 0;
389 link->pm_state = state;
390 return link->driver->suspend(link, state);
393 static int card_resume(struct pnp_dev *dev)
395 struct pnp_card_link *link = dev->card_link;
397 if (link->pm_state.event == PM_EVENT_ON)
398 return 0;
399 link->pm_state = PMSG_ON;
400 link->driver->resume(link);
401 return 0;
405 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
406 * @drv: pointer to the driver to register
408 int pnp_register_card_driver(struct pnp_card_driver *drv)
410 int error;
411 struct list_head *pos, *temp;
413 drv->link.name = drv->name;
414 drv->link.id_table = NULL; /* this will disable auto matching */
415 drv->link.flags = drv->flags;
416 drv->link.probe = NULL;
417 drv->link.remove = &card_remove_first;
418 drv->link.suspend = drv->suspend ? card_suspend : NULL;
419 drv->link.resume = drv->resume ? card_resume : NULL;
421 error = pnp_register_driver(&drv->link);
422 if (error < 0)
423 return error;
425 spin_lock(&pnp_lock);
426 list_add_tail(&drv->global_list, &pnp_card_drivers);
427 spin_unlock(&pnp_lock);
429 list_for_each_safe(pos, temp, &pnp_cards) {
430 struct pnp_card *card =
431 list_entry(pos, struct pnp_card, global_list);
432 card_probe(card, drv);
434 return 0;
438 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
439 * @drv: pointer to the driver to unregister
441 void pnp_unregister_card_driver(struct pnp_card_driver *drv)
443 spin_lock(&pnp_lock);
444 list_del(&drv->global_list);
445 spin_unlock(&pnp_lock);
446 pnp_unregister_driver(&drv->link);
449 EXPORT_SYMBOL(pnp_request_card_device);
450 EXPORT_SYMBOL(pnp_release_card_device);
451 EXPORT_SYMBOL(pnp_register_card_driver);
452 EXPORT_SYMBOL(pnp_unregister_card_driver);