Root/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
14LIST_HEAD(pnp_cards);
15static LIST_HEAD(pnp_card_drivers);
16
17static 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
51static void card_remove(struct pnp_dev *dev)
52{
53    dev->card_link = NULL;
54}
55
56static 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
69static 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 */
105static 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
134static 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
147static 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
155struct 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
182static 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
192static DEVICE_ATTR(name, S_IRUGO, pnp_show_card_name, NULL);
193
194static 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
208static DEVICE_ATTR(card_id, S_IRUGO, pnp_show_card_ids, NULL);
209
210static 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
223err_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 */
232int 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 */
273void 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 */
293int 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 */
310void 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 beginning.
324 */
325struct 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
354found:
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
364err_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 structure
373 */
374void 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 */
386static 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
396static 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 */
411int 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 */
444void 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
452EXPORT_SYMBOL(pnp_request_card_device);
453EXPORT_SYMBOL(pnp_release_card_device);
454EXPORT_SYMBOL(pnp_register_card_driver);
455EXPORT_SYMBOL(pnp_unregister_card_driver);
456

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