1// SPDX-License-Identifier: GPL-2.0
2/*
3 * card.c - contains functions for managing groups of PnP devices
4 *
5 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
6 */
7
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ctype.h>
11#include <linux/slab.h>
12#include <linux/pnp.h>
13#include <linux/dma-mapping.h>
14#include "base.h"
15
16LIST_HEAD(pnp_cards);
17static LIST_HEAD(pnp_card_drivers);
18
19static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
20 struct pnp_card *card)
21{
22 const struct pnp_card_device_id *drv_id = drv->id_table;
23
24 while (*drv_id->id) {
25 if (compare_pnp_id(pos: card->id, id: drv_id->id)) {
26 int i = 0;
27
28 for (;;) {
29 int found;
30 struct pnp_dev *dev;
31
32 if (i == PNP_MAX_DEVICES ||
33 !*drv_id->devs[i].id)
34 return drv_id;
35 found = 0;
36 card_for_each_dev(card, dev) {
37 if (compare_pnp_id(pos: dev->id,
38 id: drv_id->devs[i].id)) {
39 found = 1;
40 break;
41 }
42 }
43 if (!found)
44 break;
45 i++;
46 }
47 }
48 drv_id++;
49 }
50 return NULL;
51}
52
53static void card_remove(struct pnp_dev *dev)
54{
55 dev->card_link = NULL;
56}
57
58static void card_remove_first(struct pnp_dev *dev)
59{
60 struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
61
62 if (!dev->card || !drv)
63 return;
64 if (drv->remove)
65 drv->remove(dev->card_link);
66 drv->link.remove = &card_remove;
67 kfree(objp: dev->card_link);
68 card_remove(dev);
69}
70
71static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
72{
73 const struct pnp_card_device_id *id;
74 struct pnp_card_link *clink;
75 struct pnp_dev *dev;
76
77 if (!drv->probe)
78 return 0;
79 id = match_card(drv, card);
80 if (!id)
81 return 0;
82
83 clink = kzalloc(sizeof(*clink), GFP_KERNEL);
84 if (!clink)
85 return 0;
86 clink->card = card;
87 clink->driver = drv;
88 clink->pm_state = PMSG_ON;
89
90 if (drv->probe(clink, id) >= 0)
91 return 1;
92
93 /* Recovery */
94 card_for_each_dev(card, dev) {
95 if (dev->card_link == clink)
96 pnp_release_card_device(dev);
97 }
98 kfree(objp: clink);
99 return 0;
100}
101
102/**
103 * pnp_add_card_id - adds an EISA id to the specified card
104 * @id: pointer to a pnp_id structure
105 * @card: pointer to the desired card
106 */
107static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
108{
109 struct pnp_id *dev_id, *ptr;
110
111 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
112 if (!dev_id)
113 return NULL;
114
115 dev_id->id[0] = id[0];
116 dev_id->id[1] = id[1];
117 dev_id->id[2] = id[2];
118 dev_id->id[3] = tolower(id[3]);
119 dev_id->id[4] = tolower(id[4]);
120 dev_id->id[5] = tolower(id[5]);
121 dev_id->id[6] = tolower(id[6]);
122 dev_id->id[7] = '\0';
123
124 dev_id->next = NULL;
125 ptr = card->id;
126 while (ptr && ptr->next)
127 ptr = ptr->next;
128 if (ptr)
129 ptr->next = dev_id;
130 else
131 card->id = dev_id;
132
133 return dev_id;
134}
135
136static void pnp_free_card_ids(struct pnp_card *card)
137{
138 struct pnp_id *id;
139 struct pnp_id *next;
140
141 id = card->id;
142 while (id) {
143 next = id->next;
144 kfree(objp: id);
145 id = next;
146 }
147}
148
149static void pnp_release_card(struct device *dmdev)
150{
151 struct pnp_card *card = to_pnp_card(dmdev);
152
153 pnp_free_card_ids(card);
154 kfree(objp: card);
155}
156
157struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
158{
159 struct pnp_card *card;
160 struct pnp_id *dev_id;
161
162 card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
163 if (!card)
164 return NULL;
165
166 card->protocol = protocol;
167 card->number = id;
168
169 card->dev.parent = &card->protocol->dev;
170 dev_set_name(dev: &card->dev, name: "%02x:%02x", card->protocol->number, card->number);
171
172 card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
173 card->dev.dma_mask = &card->dev.coherent_dma_mask;
174
175 dev_id = pnp_add_card_id(card, id: pnpid);
176 if (!dev_id) {
177 kfree(objp: card);
178 return NULL;
179 }
180
181 return card;
182}
183
184static ssize_t name_show(struct device *dmdev,
185 struct device_attribute *attr, char *buf)
186{
187 char *str = buf;
188 struct pnp_card *card = to_pnp_card(dmdev);
189
190 str += sprintf(buf: str, fmt: "%s\n", card->name);
191 return (str - buf);
192}
193
194static DEVICE_ATTR_RO(name);
195
196static ssize_t card_id_show(struct device *dmdev,
197 struct device_attribute *attr, char *buf)
198{
199 char *str = buf;
200 struct pnp_card *card = to_pnp_card(dmdev);
201 struct pnp_id *pos = card->id;
202
203 while (pos) {
204 str += sprintf(buf: str, fmt: "%s\n", pos->id);
205 pos = pos->next;
206 }
207 return (str - buf);
208}
209
210static DEVICE_ATTR_RO(card_id);
211
212static int pnp_interface_attach_card(struct pnp_card *card)
213{
214 int rc = device_create_file(device: &card->dev, entry: &dev_attr_name);
215
216 if (rc)
217 return rc;
218
219 rc = device_create_file(device: &card->dev, entry: &dev_attr_card_id);
220 if (rc)
221 goto err_name;
222
223 return 0;
224
225err_name:
226 device_remove_file(dev: &card->dev, attr: &dev_attr_name);
227 return rc;
228}
229
230/**
231 * pnp_add_card - adds a PnP card to the PnP Layer
232 * @card: pointer to the card to add
233 */
234int pnp_add_card(struct pnp_card *card)
235{
236 int error;
237 struct list_head *pos, *temp;
238
239 card->dev.bus = NULL;
240 card->dev.release = &pnp_release_card;
241 error = device_register(dev: &card->dev);
242 if (error) {
243 dev_err(&card->dev, "could not register (err=%d)\n", error);
244 put_device(dev: &card->dev);
245 return error;
246 }
247
248 pnp_interface_attach_card(card);
249 mutex_lock(lock: &pnp_lock);
250 list_add_tail(new: &card->global_list, head: &pnp_cards);
251 list_add_tail(new: &card->protocol_list, head: &card->protocol->cards);
252 mutex_unlock(lock: &pnp_lock);
253
254 /* we wait until now to add devices in order to ensure the drivers
255 * will be able to use all of the related devices on the card
256 * without waiting an unreasonable length of time */
257 list_for_each(pos, &card->devices) {
258 struct pnp_dev *dev = card_to_pnp_dev(pos);
259 __pnp_add_device(dev);
260 }
261
262 /* match with card drivers */
263 list_for_each_safe(pos, temp, &pnp_card_drivers) {
264 struct pnp_card_driver *drv =
265 list_entry(pos, struct pnp_card_driver,
266 global_list);
267 card_probe(card, drv);
268 }
269 return 0;
270}
271
272/**
273 * pnp_add_card_device - adds a device to the specified card
274 * @card: pointer to the card to add to
275 * @dev: pointer to the device to add
276 */
277int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
278{
279 dev->dev.parent = &card->dev;
280 dev->card_link = NULL;
281 dev_set_name(dev: &dev->dev, name: "%02x:%02x.%02x",
282 dev->protocol->number, card->number, dev->number);
283 mutex_lock(lock: &pnp_lock);
284 dev->card = card;
285 list_add_tail(new: &dev->card_list, head: &card->devices);
286 mutex_unlock(lock: &pnp_lock);
287 return 0;
288}
289
290/**
291 * pnp_request_card_device - Searches for a PnP device under the specified card
292 * @clink: pointer to the card link, cannot be NULL
293 * @id: pointer to a PnP ID structure that explains the rules for finding the device
294 * @from: Starting place to search from. If NULL it will start from the beginning.
295 */
296struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
297 const char *id, struct pnp_dev *from)
298{
299 struct list_head *pos;
300 struct pnp_dev *dev;
301 struct pnp_card_driver *drv;
302 struct pnp_card *card;
303
304 if (!clink || !id)
305 return NULL;
306
307 card = clink->card;
308 drv = clink->driver;
309 if (!from) {
310 pos = card->devices.next;
311 } else {
312 if (from->card != card)
313 return NULL;
314 pos = from->card_list.next;
315 }
316 while (pos != &card->devices) {
317 dev = card_to_pnp_dev(pos);
318 if ((!dev->card_link) && compare_pnp_id(pos: dev->id, id))
319 goto found;
320 pos = pos->next;
321 }
322
323 return NULL;
324
325found:
326 dev->card_link = clink;
327 dev->dev.driver = &drv->link.driver;
328 if (pnp_bus_type.probe(&dev->dev))
329 goto err_out;
330 if (device_bind_driver(dev: &dev->dev))
331 goto err_out;
332
333 return dev;
334
335err_out:
336 dev->dev.driver = NULL;
337 dev->card_link = NULL;
338 return NULL;
339}
340EXPORT_SYMBOL(pnp_request_card_device);
341
342/**
343 * pnp_release_card_device - call this when the driver no longer needs the device
344 * @dev: pointer to the PnP device structure
345 */
346void pnp_release_card_device(struct pnp_dev *dev)
347{
348 struct pnp_card_driver *drv = dev->card_link->driver;
349
350 drv->link.remove = &card_remove;
351 device_release_driver(dev: &dev->dev);
352 drv->link.remove = &card_remove_first;
353}
354EXPORT_SYMBOL(pnp_release_card_device);
355
356/*
357 * suspend/resume callbacks
358 */
359static int card_suspend(struct pnp_dev *dev, pm_message_t state)
360{
361 struct pnp_card_link *link = dev->card_link;
362
363 if (link->pm_state.event == state.event)
364 return 0;
365 link->pm_state = state;
366 return link->driver->suspend(link, state);
367}
368
369static int card_resume(struct pnp_dev *dev)
370{
371 struct pnp_card_link *link = dev->card_link;
372
373 if (link->pm_state.event == PM_EVENT_ON)
374 return 0;
375 link->pm_state = PMSG_ON;
376 link->driver->resume(link);
377 return 0;
378}
379
380/**
381 * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
382 * @drv: pointer to the driver to register
383 */
384int pnp_register_card_driver(struct pnp_card_driver *drv)
385{
386 int error;
387 struct list_head *pos, *temp;
388
389 drv->link.name = drv->name;
390 drv->link.id_table = NULL; /* this will disable auto matching */
391 drv->link.flags = drv->flags;
392 drv->link.probe = NULL;
393 drv->link.remove = &card_remove_first;
394 drv->link.suspend = drv->suspend ? card_suspend : NULL;
395 drv->link.resume = drv->resume ? card_resume : NULL;
396
397 error = pnp_register_driver(drv: &drv->link);
398 if (error < 0)
399 return error;
400
401 mutex_lock(lock: &pnp_lock);
402 list_add_tail(new: &drv->global_list, head: &pnp_card_drivers);
403 mutex_unlock(lock: &pnp_lock);
404
405 list_for_each_safe(pos, temp, &pnp_cards) {
406 struct pnp_card *card =
407 list_entry(pos, struct pnp_card, global_list);
408 card_probe(card, drv);
409 }
410 return 0;
411}
412EXPORT_SYMBOL(pnp_register_card_driver);
413
414/**
415 * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
416 * @drv: pointer to the driver to unregister
417 */
418void pnp_unregister_card_driver(struct pnp_card_driver *drv)
419{
420 mutex_lock(lock: &pnp_lock);
421 list_del(entry: &drv->global_list);
422 mutex_unlock(lock: &pnp_lock);
423 pnp_unregister_driver(drv: &drv->link);
424}
425EXPORT_SYMBOL(pnp_unregister_card_driver);
426