xref: /openbmc/linux/drivers/pcmcia/ds.c (revision e23feb16)
1 /*
2  * ds.c -- 16-bit PCMCIA core support
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * The initial developer of the original code is David A. Hinds
9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
11  *
12  * (C) 1999		David A. Hinds
13  * (C) 2003 - 2010	Dominik Brodowski
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/errno.h>
20 #include <linux/list.h>
21 #include <linux/delay.h>
22 #include <linux/workqueue.h>
23 #include <linux/crc32.h>
24 #include <linux/firmware.h>
25 #include <linux/kref.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/slab.h>
28 
29 #include <pcmcia/cistpl.h>
30 #include <pcmcia/ds.h>
31 #include <pcmcia/ss.h>
32 
33 #include "cs_internal.h"
34 
35 /*====================================================================*/
36 
37 /* Module parameters */
38 
39 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
40 MODULE_DESCRIPTION("PCMCIA Driver Services");
41 MODULE_LICENSE("GPL");
42 
43 
44 /*====================================================================*/
45 
46 static void pcmcia_check_driver(struct pcmcia_driver *p_drv)
47 {
48 	const struct pcmcia_device_id *did = p_drv->id_table;
49 	unsigned int i;
50 	u32 hash;
51 
52 	if (!p_drv->probe || !p_drv->remove)
53 		printk(KERN_DEBUG "pcmcia: %s lacks a requisite callback "
54 		       "function\n", p_drv->name);
55 
56 	while (did && did->match_flags) {
57 		for (i = 0; i < 4; i++) {
58 			if (!did->prod_id[i])
59 				continue;
60 
61 			hash = crc32(0, did->prod_id[i], strlen(did->prod_id[i]));
62 			if (hash == did->prod_id_hash[i])
63 				continue;
64 
65 			printk(KERN_DEBUG "pcmcia: %s: invalid hash for "
66 			       "product string \"%s\": is 0x%x, should "
67 			       "be 0x%x\n", p_drv->name, did->prod_id[i],
68 			       did->prod_id_hash[i], hash);
69 			printk(KERN_DEBUG "pcmcia: see "
70 				"Documentation/pcmcia/devicetable.txt for "
71 				"details\n");
72 		}
73 		did++;
74 	}
75 
76 	return;
77 }
78 
79 
80 /*======================================================================*/
81 
82 
83 struct pcmcia_dynid {
84 	struct list_head 		node;
85 	struct pcmcia_device_id 	id;
86 };
87 
88 /**
89  * pcmcia_store_new_id - add a new PCMCIA device ID to this driver and re-probe devices
90  * @driver: target device driver
91  * @buf: buffer for scanning device ID data
92  * @count: input size
93  *
94  * Adds a new dynamic PCMCIA device ID to this driver,
95  * and causes the driver to probe for all devices again.
96  */
97 static ssize_t
98 pcmcia_store_new_id(struct device_driver *driver, const char *buf, size_t count)
99 {
100 	struct pcmcia_dynid *dynid;
101 	struct pcmcia_driver *pdrv = to_pcmcia_drv(driver);
102 	__u16 match_flags, manf_id, card_id;
103 	__u8 func_id, function, device_no;
104 	__u32 prod_id_hash[4] = {0, 0, 0, 0};
105 	int fields = 0;
106 	int retval = 0;
107 
108 	fields = sscanf(buf, "%hx %hx %hx %hhx %hhx %hhx %x %x %x %x",
109 			&match_flags, &manf_id, &card_id, &func_id, &function, &device_no,
110 			&prod_id_hash[0], &prod_id_hash[1], &prod_id_hash[2], &prod_id_hash[3]);
111 	if (fields < 6)
112 		return -EINVAL;
113 
114 	dynid = kzalloc(sizeof(struct pcmcia_dynid), GFP_KERNEL);
115 	if (!dynid)
116 		return -ENOMEM;
117 
118 	dynid->id.match_flags = match_flags;
119 	dynid->id.manf_id = manf_id;
120 	dynid->id.card_id = card_id;
121 	dynid->id.func_id = func_id;
122 	dynid->id.function = function;
123 	dynid->id.device_no = device_no;
124 	memcpy(dynid->id.prod_id_hash, prod_id_hash, sizeof(__u32) * 4);
125 
126 	mutex_lock(&pdrv->dynids.lock);
127 	list_add_tail(&dynid->node, &pdrv->dynids.list);
128 	mutex_unlock(&pdrv->dynids.lock);
129 
130 	retval = driver_attach(&pdrv->drv);
131 
132 	if (retval)
133 		return retval;
134 	return count;
135 }
136 static DRIVER_ATTR(new_id, S_IWUSR, NULL, pcmcia_store_new_id);
137 
138 static void
139 pcmcia_free_dynids(struct pcmcia_driver *drv)
140 {
141 	struct pcmcia_dynid *dynid, *n;
142 
143 	mutex_lock(&drv->dynids.lock);
144 	list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
145 		list_del(&dynid->node);
146 		kfree(dynid);
147 	}
148 	mutex_unlock(&drv->dynids.lock);
149 }
150 
151 static int
152 pcmcia_create_newid_file(struct pcmcia_driver *drv)
153 {
154 	int error = 0;
155 	if (drv->probe != NULL)
156 		error = driver_create_file(&drv->drv, &driver_attr_new_id);
157 	return error;
158 }
159 
160 static void
161 pcmcia_remove_newid_file(struct pcmcia_driver *drv)
162 {
163 	driver_remove_file(&drv->drv, &driver_attr_new_id);
164 }
165 
166 /**
167  * pcmcia_register_driver - register a PCMCIA driver with the bus core
168  * @driver: the &driver being registered
169  *
170  * Registers a PCMCIA driver with the PCMCIA bus core.
171  */
172 int pcmcia_register_driver(struct pcmcia_driver *driver)
173 {
174 	int error;
175 
176 	if (!driver)
177 		return -EINVAL;
178 
179 	pcmcia_check_driver(driver);
180 
181 	/* initialize common fields */
182 	driver->drv.bus = &pcmcia_bus_type;
183 	driver->drv.owner = driver->owner;
184 	driver->drv.name = driver->name;
185 	mutex_init(&driver->dynids.lock);
186 	INIT_LIST_HEAD(&driver->dynids.list);
187 
188 	pr_debug("registering driver %s\n", driver->name);
189 
190 	error = driver_register(&driver->drv);
191 	if (error < 0)
192 		return error;
193 
194 	error = pcmcia_create_newid_file(driver);
195 	if (error)
196 		driver_unregister(&driver->drv);
197 
198 	return error;
199 }
200 EXPORT_SYMBOL(pcmcia_register_driver);
201 
202 /**
203  * pcmcia_unregister_driver - unregister a PCMCIA driver with the bus core
204  * @driver: the &driver being unregistered
205  */
206 void pcmcia_unregister_driver(struct pcmcia_driver *driver)
207 {
208 	pr_debug("unregistering driver %s\n", driver->name);
209 	pcmcia_remove_newid_file(driver);
210 	driver_unregister(&driver->drv);
211 	pcmcia_free_dynids(driver);
212 }
213 EXPORT_SYMBOL(pcmcia_unregister_driver);
214 
215 
216 /* pcmcia_device handling */
217 
218 static struct pcmcia_device *pcmcia_get_dev(struct pcmcia_device *p_dev)
219 {
220 	struct device *tmp_dev;
221 	tmp_dev = get_device(&p_dev->dev);
222 	if (!tmp_dev)
223 		return NULL;
224 	return to_pcmcia_dev(tmp_dev);
225 }
226 
227 static void pcmcia_put_dev(struct pcmcia_device *p_dev)
228 {
229 	if (p_dev)
230 		put_device(&p_dev->dev);
231 }
232 
233 static void pcmcia_release_function(struct kref *ref)
234 {
235 	struct config_t *c = container_of(ref, struct config_t, ref);
236 	pr_debug("releasing config_t\n");
237 	kfree(c);
238 }
239 
240 static void pcmcia_release_dev(struct device *dev)
241 {
242 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
243 	int i;
244 	dev_dbg(dev, "releasing device\n");
245 	pcmcia_put_socket(p_dev->socket);
246 	for (i = 0; i < 4; i++)
247 		kfree(p_dev->prod_id[i]);
248 	kfree(p_dev->devname);
249 	kref_put(&p_dev->function_config->ref, pcmcia_release_function);
250 	kfree(p_dev);
251 }
252 
253 
254 static int pcmcia_device_probe(struct device *dev)
255 {
256 	struct pcmcia_device *p_dev;
257 	struct pcmcia_driver *p_drv;
258 	struct pcmcia_socket *s;
259 	cistpl_config_t cis_config;
260 	int ret = 0;
261 
262 	dev = get_device(dev);
263 	if (!dev)
264 		return -ENODEV;
265 
266 	p_dev = to_pcmcia_dev(dev);
267 	p_drv = to_pcmcia_drv(dev->driver);
268 	s = p_dev->socket;
269 
270 	dev_dbg(dev, "trying to bind to %s\n", p_drv->name);
271 
272 	if ((!p_drv->probe) || (!p_dev->function_config) ||
273 	    (!try_module_get(p_drv->owner))) {
274 		ret = -EINVAL;
275 		goto put_dev;
276 	}
277 
278 	/* set up some more device information */
279 	ret = pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_CONFIG,
280 				&cis_config);
281 	if (!ret) {
282 		p_dev->config_base = cis_config.base;
283 		p_dev->config_regs = cis_config.rmask[0];
284 		dev_dbg(dev, "base %x, regs %x", p_dev->config_base,
285 			p_dev->config_regs);
286 	} else {
287 		dev_printk(KERN_INFO, dev,
288 			   "pcmcia: could not parse base and rmask0 of CIS\n");
289 		p_dev->config_base = 0;
290 		p_dev->config_regs = 0;
291 	}
292 
293 	ret = p_drv->probe(p_dev);
294 	if (ret) {
295 		dev_dbg(dev, "binding to %s failed with %d\n",
296 			   p_drv->name, ret);
297 		goto put_module;
298 	}
299 	dev_dbg(dev, "%s bound: Vpp %d.%d, idx %x, IRQ %d", p_drv->name,
300 		p_dev->vpp/10, p_dev->vpp%10, p_dev->config_index, p_dev->irq);
301 	dev_dbg(dev, "resources: ioport %pR %pR iomem %pR %pR %pR",
302 		p_dev->resource[0], p_dev->resource[1], p_dev->resource[2],
303 		p_dev->resource[3], p_dev->resource[4]);
304 
305 	mutex_lock(&s->ops_mutex);
306 	if ((s->pcmcia_pfc) &&
307 	    (p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
308 		pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
309 	mutex_unlock(&s->ops_mutex);
310 
311 put_module:
312 	if (ret)
313 		module_put(p_drv->owner);
314 put_dev:
315 	if (ret)
316 		put_device(dev);
317 	return ret;
318 }
319 
320 
321 /*
322  * Removes a PCMCIA card from the device tree and socket list.
323  */
324 static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *leftover)
325 {
326 	struct pcmcia_device	*p_dev;
327 	struct pcmcia_device	*tmp;
328 
329 	dev_dbg(leftover ? &leftover->dev : &s->dev,
330 		   "pcmcia_card_remove(%d) %s\n", s->sock,
331 		   leftover ? leftover->devname : "");
332 
333 	mutex_lock(&s->ops_mutex);
334 	if (!leftover)
335 		s->device_count = 0;
336 	else
337 		s->device_count = 1;
338 	mutex_unlock(&s->ops_mutex);
339 
340 	/* unregister all pcmcia_devices registered with this socket, except leftover */
341 	list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
342 		if (p_dev == leftover)
343 			continue;
344 
345 		mutex_lock(&s->ops_mutex);
346 		list_del(&p_dev->socket_device_list);
347 		mutex_unlock(&s->ops_mutex);
348 
349 		dev_dbg(&p_dev->dev, "unregistering device\n");
350 		device_unregister(&p_dev->dev);
351 	}
352 
353 	return;
354 }
355 
356 static int pcmcia_device_remove(struct device *dev)
357 {
358 	struct pcmcia_device *p_dev;
359 	struct pcmcia_driver *p_drv;
360 	int i;
361 
362 	p_dev = to_pcmcia_dev(dev);
363 	p_drv = to_pcmcia_drv(dev->driver);
364 
365 	dev_dbg(dev, "removing device\n");
366 
367 	/* If we're removing the primary module driving a
368 	 * pseudo multi-function card, we need to unbind
369 	 * all devices
370 	 */
371 	if ((p_dev->socket->pcmcia_pfc) &&
372 	    (p_dev->socket->device_count > 0) &&
373 	    (p_dev->device_no == 0))
374 		pcmcia_card_remove(p_dev->socket, p_dev);
375 
376 	/* detach the "instance" */
377 	if (!p_drv)
378 		return 0;
379 
380 	if (p_drv->remove)
381 		p_drv->remove(p_dev);
382 
383 	/* check for proper unloading */
384 	if (p_dev->_irq || p_dev->_io || p_dev->_locked)
385 		dev_printk(KERN_INFO, dev,
386 			"pcmcia: driver %s did not release config properly\n",
387 			p_drv->name);
388 
389 	for (i = 0; i < MAX_WIN; i++)
390 		if (p_dev->_win & CLIENT_WIN_REQ(i))
391 			dev_printk(KERN_INFO, dev,
392 			  "pcmcia: driver %s did not release window properly\n",
393 			   p_drv->name);
394 
395 	/* references from pcmcia_probe_device */
396 	pcmcia_put_dev(p_dev);
397 	module_put(p_drv->owner);
398 
399 	return 0;
400 }
401 
402 
403 /*
404  * pcmcia_device_query -- determine information about a pcmcia device
405  */
406 static int pcmcia_device_query(struct pcmcia_device *p_dev)
407 {
408 	cistpl_manfid_t manf_id;
409 	cistpl_funcid_t func_id;
410 	cistpl_vers_1_t	*vers1;
411 	unsigned int i;
412 
413 	vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
414 	if (!vers1)
415 		return -ENOMEM;
416 
417 	if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL,
418 			       CISTPL_MANFID, &manf_id)) {
419 		mutex_lock(&p_dev->socket->ops_mutex);
420 		p_dev->manf_id = manf_id.manf;
421 		p_dev->card_id = manf_id.card;
422 		p_dev->has_manf_id = 1;
423 		p_dev->has_card_id = 1;
424 		mutex_unlock(&p_dev->socket->ops_mutex);
425 	}
426 
427 	if (!pccard_read_tuple(p_dev->socket, p_dev->func,
428 			       CISTPL_FUNCID, &func_id)) {
429 		mutex_lock(&p_dev->socket->ops_mutex);
430 		p_dev->func_id = func_id.func;
431 		p_dev->has_func_id = 1;
432 		mutex_unlock(&p_dev->socket->ops_mutex);
433 	} else {
434 		/* rule of thumb: cards with no FUNCID, but with
435 		 * common memory device geometry information, are
436 		 * probably memory cards (from pcmcia-cs) */
437 		cistpl_device_geo_t *devgeo;
438 
439 		devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
440 		if (!devgeo) {
441 			kfree(vers1);
442 			return -ENOMEM;
443 		}
444 		if (!pccard_read_tuple(p_dev->socket, p_dev->func,
445 				      CISTPL_DEVICE_GEO, devgeo)) {
446 			dev_dbg(&p_dev->dev,
447 				   "mem device geometry probably means "
448 				   "FUNCID_MEMORY\n");
449 			mutex_lock(&p_dev->socket->ops_mutex);
450 			p_dev->func_id = CISTPL_FUNCID_MEMORY;
451 			p_dev->has_func_id = 1;
452 			mutex_unlock(&p_dev->socket->ops_mutex);
453 		}
454 		kfree(devgeo);
455 	}
456 
457 	if (!pccard_read_tuple(p_dev->socket, BIND_FN_ALL, CISTPL_VERS_1,
458 			       vers1)) {
459 		mutex_lock(&p_dev->socket->ops_mutex);
460 		for (i = 0; i < min_t(unsigned int, 4, vers1->ns); i++) {
461 			char *tmp;
462 			unsigned int length;
463 			char *new;
464 
465 			tmp = vers1->str + vers1->ofs[i];
466 
467 			length = strlen(tmp) + 1;
468 			if ((length < 2) || (length > 255))
469 				continue;
470 
471 			new = kmalloc(sizeof(char) * length, GFP_KERNEL);
472 			if (!new)
473 				continue;
474 
475 			new = strncpy(new, tmp, length);
476 
477 			tmp = p_dev->prod_id[i];
478 			p_dev->prod_id[i] = new;
479 			kfree(tmp);
480 		}
481 		mutex_unlock(&p_dev->socket->ops_mutex);
482 	}
483 
484 	kfree(vers1);
485 	return 0;
486 }
487 
488 
489 static struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s,
490 					       unsigned int function)
491 {
492 	struct pcmcia_device *p_dev, *tmp_dev;
493 	int i;
494 
495 	s = pcmcia_get_socket(s);
496 	if (!s)
497 		return NULL;
498 
499 	pr_debug("adding device to %d, function %d\n", s->sock, function);
500 
501 	p_dev = kzalloc(sizeof(struct pcmcia_device), GFP_KERNEL);
502 	if (!p_dev)
503 		goto err_put;
504 
505 	mutex_lock(&s->ops_mutex);
506 	p_dev->device_no = (s->device_count++);
507 	mutex_unlock(&s->ops_mutex);
508 
509 	/* max of 2 PFC devices */
510 	if ((p_dev->device_no >= 2) && (function == 0))
511 		goto err_free;
512 
513 	/* max of 4 devices overall */
514 	if (p_dev->device_no >= 4)
515 		goto err_free;
516 
517 	p_dev->socket = s;
518 	p_dev->func   = function;
519 
520 	p_dev->dev.bus = &pcmcia_bus_type;
521 	p_dev->dev.parent = s->dev.parent;
522 	p_dev->dev.release = pcmcia_release_dev;
523 	/* by default don't allow DMA */
524 	p_dev->dma_mask = DMA_MASK_NONE;
525 	p_dev->dev.dma_mask = &p_dev->dma_mask;
526 	dev_set_name(&p_dev->dev, "%d.%d", p_dev->socket->sock, p_dev->device_no);
527 	if (!dev_name(&p_dev->dev))
528 		goto err_free;
529 	p_dev->devname = kasprintf(GFP_KERNEL, "pcmcia%s", dev_name(&p_dev->dev));
530 	if (!p_dev->devname)
531 		goto err_free;
532 	dev_dbg(&p_dev->dev, "devname is %s\n", p_dev->devname);
533 
534 	mutex_lock(&s->ops_mutex);
535 
536 	/*
537 	 * p_dev->function_config must be the same for all card functions.
538 	 * Note that this is serialized by ops_mutex, so that only one
539 	 * such struct will be created.
540 	 */
541 	list_for_each_entry(tmp_dev, &s->devices_list, socket_device_list)
542 		if (p_dev->func == tmp_dev->func) {
543 			p_dev->function_config = tmp_dev->function_config;
544 			p_dev->irq = tmp_dev->irq;
545 			kref_get(&p_dev->function_config->ref);
546 		}
547 
548 	/* Add to the list in pcmcia_bus_socket */
549 	list_add(&p_dev->socket_device_list, &s->devices_list);
550 
551 	if (pcmcia_setup_irq(p_dev))
552 		dev_warn(&p_dev->dev,
553 			"IRQ setup failed -- device might not work\n");
554 
555 	if (!p_dev->function_config) {
556 		config_t *c;
557 		dev_dbg(&p_dev->dev, "creating config_t\n");
558 		c = kzalloc(sizeof(struct config_t), GFP_KERNEL);
559 		if (!c) {
560 			mutex_unlock(&s->ops_mutex);
561 			goto err_unreg;
562 		}
563 		p_dev->function_config = c;
564 		kref_init(&c->ref);
565 		for (i = 0; i < MAX_IO_WIN; i++) {
566 			c->io[i].name = p_dev->devname;
567 			c->io[i].flags = IORESOURCE_IO;
568 		}
569 		for (i = 0; i< MAX_WIN; i++) {
570 			c->mem[i].name = p_dev->devname;
571 			c->mem[i].flags = IORESOURCE_MEM;
572 		}
573 	}
574 	for (i = 0; i < MAX_IO_WIN; i++)
575 		p_dev->resource[i] = &p_dev->function_config->io[i];
576 	for (; i < (MAX_IO_WIN + MAX_WIN); i++)
577 		p_dev->resource[i] = &p_dev->function_config->mem[i-MAX_IO_WIN];
578 
579 	mutex_unlock(&s->ops_mutex);
580 
581 	dev_printk(KERN_NOTICE, &p_dev->dev,
582 		   "pcmcia: registering new device %s (IRQ: %d)\n",
583 		   p_dev->devname, p_dev->irq);
584 
585 	pcmcia_device_query(p_dev);
586 
587 	if (device_register(&p_dev->dev))
588 		goto err_unreg;
589 
590 	return p_dev;
591 
592  err_unreg:
593 	mutex_lock(&s->ops_mutex);
594 	list_del(&p_dev->socket_device_list);
595 	mutex_unlock(&s->ops_mutex);
596 
597  err_free:
598 	mutex_lock(&s->ops_mutex);
599 	s->device_count--;
600 	mutex_unlock(&s->ops_mutex);
601 
602 	for (i = 0; i < 4; i++)
603 		kfree(p_dev->prod_id[i]);
604 	kfree(p_dev->devname);
605 	kfree(p_dev);
606  err_put:
607 	pcmcia_put_socket(s);
608 
609 	return NULL;
610 }
611 
612 
613 static int pcmcia_card_add(struct pcmcia_socket *s)
614 {
615 	cistpl_longlink_mfc_t mfc;
616 	unsigned int no_funcs, i, no_chains;
617 	int ret = -EAGAIN;
618 
619 	mutex_lock(&s->ops_mutex);
620 	if (!(s->resource_setup_done)) {
621 		dev_dbg(&s->dev,
622 			   "no resources available, delaying card_add\n");
623 		mutex_unlock(&s->ops_mutex);
624 		return -EAGAIN; /* try again, but later... */
625 	}
626 
627 	if (pcmcia_validate_mem(s)) {
628 		dev_dbg(&s->dev, "validating mem resources failed, "
629 		       "delaying card_add\n");
630 		mutex_unlock(&s->ops_mutex);
631 		return -EAGAIN; /* try again, but later... */
632 	}
633 	mutex_unlock(&s->ops_mutex);
634 
635 	ret = pccard_validate_cis(s, &no_chains);
636 	if (ret || !no_chains) {
637 		dev_dbg(&s->dev, "invalid CIS or invalid resources\n");
638 		return -ENODEV;
639 	}
640 
641 	if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC, &mfc))
642 		no_funcs = mfc.nfn;
643 	else
644 		no_funcs = 1;
645 	s->functions = no_funcs;
646 
647 	for (i = 0; i < no_funcs; i++)
648 		pcmcia_device_add(s, i);
649 
650 	return ret;
651 }
652 
653 
654 static int pcmcia_requery_callback(struct device *dev, void * _data)
655 {
656 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
657 	if (!p_dev->dev.driver) {
658 		dev_dbg(dev, "update device information\n");
659 		pcmcia_device_query(p_dev);
660 	}
661 
662 	return 0;
663 }
664 
665 
666 static void pcmcia_requery(struct pcmcia_socket *s)
667 {
668 	int has_pfc;
669 
670 	if (s->functions == 0) {
671 		pcmcia_card_add(s);
672 		return;
673 	}
674 
675 	/* some device information might have changed because of a CIS
676 	 * update or because we can finally read it correctly... so
677 	 * determine it again, overwriting old values if necessary. */
678 	bus_for_each_dev(&pcmcia_bus_type, NULL, NULL, pcmcia_requery_callback);
679 
680 	/* if the CIS changed, we need to check whether the number of
681 	 * functions changed. */
682 	if (s->fake_cis) {
683 		int old_funcs, new_funcs;
684 		cistpl_longlink_mfc_t mfc;
685 
686 		/* does this cis override add or remove functions? */
687 		old_funcs = s->functions;
688 
689 		if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
690 					&mfc))
691 			new_funcs = mfc.nfn;
692 		else
693 			new_funcs = 1;
694 		if (old_funcs != new_funcs) {
695 			/* we need to re-start */
696 			pcmcia_card_remove(s, NULL);
697 			s->functions = 0;
698 			pcmcia_card_add(s);
699 		}
700 	}
701 
702 	/* If the PCMCIA device consists of two pseudo devices,
703 	 * call pcmcia_device_add() -- which will fail if both
704 	 * devices are already registered. */
705 	mutex_lock(&s->ops_mutex);
706 	has_pfc = s->pcmcia_pfc;
707 	mutex_unlock(&s->ops_mutex);
708 	if (has_pfc)
709 		pcmcia_device_add(s, 0);
710 
711 	/* we re-scan all devices, not just the ones connected to this
712 	 * socket. This does not matter, though. */
713 	if (bus_rescan_devices(&pcmcia_bus_type))
714 		dev_warn(&s->dev, "rescanning the bus failed\n");
715 }
716 
717 
718 #ifdef CONFIG_PCMCIA_LOAD_CIS
719 
720 /**
721  * pcmcia_load_firmware - load CIS from userspace if device-provided is broken
722  * @dev: the pcmcia device which needs a CIS override
723  * @filename: requested filename in /lib/firmware/
724  *
725  * This uses the in-kernel firmware loading mechanism to use a "fake CIS" if
726  * the one provided by the card is broken. The firmware files reside in
727  * /lib/firmware/ in userspace.
728  */
729 static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
730 {
731 	struct pcmcia_socket *s = dev->socket;
732 	const struct firmware *fw;
733 	int ret = -ENOMEM;
734 	cistpl_longlink_mfc_t mfc;
735 	int old_funcs, new_funcs = 1;
736 
737 	if (!filename)
738 		return -EINVAL;
739 
740 	dev_dbg(&dev->dev, "trying to load CIS file %s\n", filename);
741 
742 	if (request_firmware(&fw, filename, &dev->dev) == 0) {
743 		if (fw->size >= CISTPL_MAX_CIS_SIZE) {
744 			ret = -EINVAL;
745 			dev_printk(KERN_ERR, &dev->dev,
746 				   "pcmcia: CIS override is too big\n");
747 			goto release;
748 		}
749 
750 		if (!pcmcia_replace_cis(s, fw->data, fw->size))
751 			ret = 0;
752 		else {
753 			dev_printk(KERN_ERR, &dev->dev,
754 				   "pcmcia: CIS override failed\n");
755 			goto release;
756 		}
757 
758 		/* we need to re-start if the number of functions changed */
759 		old_funcs = s->functions;
760 		if (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_LONGLINK_MFC,
761 					&mfc))
762 			new_funcs = mfc.nfn;
763 
764 		if (old_funcs != new_funcs)
765 			ret = -EBUSY;
766 
767 		/* update information */
768 		pcmcia_device_query(dev);
769 
770 		/* requery (as number of functions might have changed) */
771 		pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
772 	}
773  release:
774 	release_firmware(fw);
775 
776 	return ret;
777 }
778 
779 #else /* !CONFIG_PCMCIA_LOAD_CIS */
780 
781 static inline int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
782 {
783 	return -ENODEV;
784 }
785 
786 #endif
787 
788 
789 static inline int pcmcia_devmatch(struct pcmcia_device *dev,
790 				  const struct pcmcia_device_id *did)
791 {
792 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID) {
793 		if ((!dev->has_manf_id) || (dev->manf_id != did->manf_id))
794 			return 0;
795 	}
796 
797 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID) {
798 		if ((!dev->has_card_id) || (dev->card_id != did->card_id))
799 			return 0;
800 	}
801 
802 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION) {
803 		if (dev->func != did->function)
804 			return 0;
805 	}
806 
807 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1) {
808 		if (!dev->prod_id[0])
809 			return 0;
810 		if (strcmp(did->prod_id[0], dev->prod_id[0]))
811 			return 0;
812 	}
813 
814 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2) {
815 		if (!dev->prod_id[1])
816 			return 0;
817 		if (strcmp(did->prod_id[1], dev->prod_id[1]))
818 			return 0;
819 	}
820 
821 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3) {
822 		if (!dev->prod_id[2])
823 			return 0;
824 		if (strcmp(did->prod_id[2], dev->prod_id[2]))
825 			return 0;
826 	}
827 
828 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4) {
829 		if (!dev->prod_id[3])
830 			return 0;
831 		if (strcmp(did->prod_id[3], dev->prod_id[3]))
832 			return 0;
833 	}
834 
835 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) {
836 		dev_dbg(&dev->dev, "this is a pseudo-multi-function device\n");
837 		mutex_lock(&dev->socket->ops_mutex);
838 		dev->socket->pcmcia_pfc = 1;
839 		mutex_unlock(&dev->socket->ops_mutex);
840 		if (dev->device_no != did->device_no)
841 			return 0;
842 	}
843 
844 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID) {
845 		int ret;
846 
847 		if ((!dev->has_func_id) || (dev->func_id != did->func_id))
848 			return 0;
849 
850 		/* if this is a pseudo-multi-function device,
851 		 * we need explicit matches */
852 		if (dev->socket->pcmcia_pfc)
853 			return 0;
854 		if (dev->device_no)
855 			return 0;
856 
857 		/* also, FUNC_ID matching needs to be activated by userspace
858 		 * after it has re-checked that there is no possible module
859 		 * with a prod_id/manf_id/card_id match.
860 		 */
861 		mutex_lock(&dev->socket->ops_mutex);
862 		ret = dev->allow_func_id_match;
863 		mutex_unlock(&dev->socket->ops_mutex);
864 
865 		if (!ret) {
866 			dev_dbg(&dev->dev,
867 				"skipping FUNC_ID match until userspace ACK\n");
868 			return 0;
869 		}
870 	}
871 
872 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_FAKE_CIS) {
873 		dev_dbg(&dev->dev, "device needs a fake CIS\n");
874 		if (!dev->socket->fake_cis)
875 			if (pcmcia_load_firmware(dev, did->cisfile))
876 				return 0;
877 	}
878 
879 	if (did->match_flags & PCMCIA_DEV_ID_MATCH_ANONYMOUS) {
880 		int i;
881 		for (i = 0; i < 4; i++)
882 			if (dev->prod_id[i])
883 				return 0;
884 		if (dev->has_manf_id || dev->has_card_id || dev->has_func_id)
885 			return 0;
886 	}
887 
888 	return 1;
889 }
890 
891 
892 static int pcmcia_bus_match(struct device *dev, struct device_driver *drv)
893 {
894 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
895 	struct pcmcia_driver *p_drv = to_pcmcia_drv(drv);
896 	const struct pcmcia_device_id *did = p_drv->id_table;
897 	struct pcmcia_dynid *dynid;
898 
899 	/* match dynamic devices first */
900 	mutex_lock(&p_drv->dynids.lock);
901 	list_for_each_entry(dynid, &p_drv->dynids.list, node) {
902 		dev_dbg(dev, "trying to match to %s\n", drv->name);
903 		if (pcmcia_devmatch(p_dev, &dynid->id)) {
904 			dev_dbg(dev, "matched to %s\n", drv->name);
905 			mutex_unlock(&p_drv->dynids.lock);
906 			return 1;
907 		}
908 	}
909 	mutex_unlock(&p_drv->dynids.lock);
910 
911 	while (did && did->match_flags) {
912 		dev_dbg(dev, "trying to match to %s\n", drv->name);
913 		if (pcmcia_devmatch(p_dev, did)) {
914 			dev_dbg(dev, "matched to %s\n", drv->name);
915 			return 1;
916 		}
917 		did++;
918 	}
919 
920 	return 0;
921 }
922 
923 static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
924 {
925 	struct pcmcia_device *p_dev;
926 	int i;
927 	u32 hash[4] = { 0, 0, 0, 0};
928 
929 	if (!dev)
930 		return -ENODEV;
931 
932 	p_dev = to_pcmcia_dev(dev);
933 
934 	/* calculate hashes */
935 	for (i = 0; i < 4; i++) {
936 		if (!p_dev->prod_id[i])
937 			continue;
938 		hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
939 	}
940 
941 	if (add_uevent_var(env, "SOCKET_NO=%u", p_dev->socket->sock))
942 		return -ENOMEM;
943 
944 	if (add_uevent_var(env, "DEVICE_NO=%02X", p_dev->device_no))
945 		return -ENOMEM;
946 
947 	if (add_uevent_var(env, "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
948 			   "pa%08Xpb%08Xpc%08Xpd%08X",
949 			   p_dev->has_manf_id ? p_dev->manf_id : 0,
950 			   p_dev->has_card_id ? p_dev->card_id : 0,
951 			   p_dev->has_func_id ? p_dev->func_id : 0,
952 			   p_dev->func,
953 			   p_dev->device_no,
954 			   hash[0],
955 			   hash[1],
956 			   hash[2],
957 			   hash[3]))
958 		return -ENOMEM;
959 
960 	return 0;
961 }
962 
963 /************************ runtime PM support ***************************/
964 
965 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state);
966 static int pcmcia_dev_resume(struct device *dev);
967 
968 static int runtime_suspend(struct device *dev)
969 {
970 	int rc;
971 
972 	device_lock(dev);
973 	rc = pcmcia_dev_suspend(dev, PMSG_SUSPEND);
974 	device_unlock(dev);
975 	return rc;
976 }
977 
978 static int runtime_resume(struct device *dev)
979 {
980 	int rc;
981 
982 	device_lock(dev);
983 	rc = pcmcia_dev_resume(dev);
984 	device_unlock(dev);
985 	return rc;
986 }
987 
988 /************************ per-device sysfs output ***************************/
989 
990 #define pcmcia_device_attr(field, test, format)				\
991 static ssize_t field##_show (struct device *dev, struct device_attribute *attr, char *buf)		\
992 {									\
993 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);		\
994 	return p_dev->test ? sprintf(buf, format, p_dev->field) : -ENODEV; \
995 }
996 
997 #define pcmcia_device_stringattr(name, field)					\
998 static ssize_t name##_show (struct device *dev, struct device_attribute *attr, char *buf)		\
999 {									\
1000 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);		\
1001 	return p_dev->field ? sprintf(buf, "%s\n", p_dev->field) : -ENODEV; \
1002 }
1003 
1004 pcmcia_device_attr(func, socket, "0x%02x\n");
1005 pcmcia_device_attr(func_id, has_func_id, "0x%02x\n");
1006 pcmcia_device_attr(manf_id, has_manf_id, "0x%04x\n");
1007 pcmcia_device_attr(card_id, has_card_id, "0x%04x\n");
1008 pcmcia_device_stringattr(prod_id1, prod_id[0]);
1009 pcmcia_device_stringattr(prod_id2, prod_id[1]);
1010 pcmcia_device_stringattr(prod_id3, prod_id[2]);
1011 pcmcia_device_stringattr(prod_id4, prod_id[3]);
1012 
1013 static ssize_t pcmcia_show_resources(struct device *dev,
1014 				     struct device_attribute *attr, char *buf)
1015 {
1016 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1017 	char *str = buf;
1018 	int i;
1019 
1020 	for (i = 0; i < PCMCIA_NUM_RESOURCES; i++)
1021 		str += sprintf(str, "%pr\n", p_dev->resource[i]);
1022 
1023 	return str - buf;
1024 }
1025 
1026 static ssize_t pcmcia_show_pm_state(struct device *dev, struct device_attribute *attr, char *buf)
1027 {
1028 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1029 
1030 	if (p_dev->suspended)
1031 		return sprintf(buf, "off\n");
1032 	else
1033 		return sprintf(buf, "on\n");
1034 }
1035 
1036 static ssize_t pcmcia_store_pm_state(struct device *dev, struct device_attribute *attr,
1037 				     const char *buf, size_t count)
1038 {
1039 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1040 	int ret = 0;
1041 
1042 	if (!count)
1043 		return -EINVAL;
1044 
1045 	if ((!p_dev->suspended) && !strncmp(buf, "off", 3))
1046 		ret = runtime_suspend(dev);
1047 	else if (p_dev->suspended && !strncmp(buf, "on", 2))
1048 		ret = runtime_resume(dev);
1049 
1050 	return ret ? ret : count;
1051 }
1052 
1053 
1054 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1055 {
1056 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1057 	int i;
1058 	u32 hash[4] = { 0, 0, 0, 0};
1059 
1060 	/* calculate hashes */
1061 	for (i = 0; i < 4; i++) {
1062 		if (!p_dev->prod_id[i])
1063 			continue;
1064 		hash[i] = crc32(0, p_dev->prod_id[i],
1065 				strlen(p_dev->prod_id[i]));
1066 	}
1067 	return sprintf(buf, "pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
1068 				"pa%08Xpb%08Xpc%08Xpd%08X\n",
1069 				p_dev->has_manf_id ? p_dev->manf_id : 0,
1070 				p_dev->has_card_id ? p_dev->card_id : 0,
1071 				p_dev->has_func_id ? p_dev->func_id : 0,
1072 				p_dev->func, p_dev->device_no,
1073 				hash[0], hash[1], hash[2], hash[3]);
1074 }
1075 
1076 static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
1077 		struct device_attribute *attr, const char *buf, size_t count)
1078 {
1079 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1080 
1081 	if (!count)
1082 		return -EINVAL;
1083 
1084 	mutex_lock(&p_dev->socket->ops_mutex);
1085 	p_dev->allow_func_id_match = 1;
1086 	mutex_unlock(&p_dev->socket->ops_mutex);
1087 	pcmcia_parse_uevents(p_dev->socket, PCMCIA_UEVENT_REQUERY);
1088 
1089 	return count;
1090 }
1091 
1092 static struct device_attribute pcmcia_dev_attrs[] = {
1093 	__ATTR(function, 0444, func_show, NULL),
1094 	__ATTR(pm_state, 0644, pcmcia_show_pm_state, pcmcia_store_pm_state),
1095 	__ATTR(resources, 0444, pcmcia_show_resources, NULL),
1096 	__ATTR_RO(func_id),
1097 	__ATTR_RO(manf_id),
1098 	__ATTR_RO(card_id),
1099 	__ATTR_RO(prod_id1),
1100 	__ATTR_RO(prod_id2),
1101 	__ATTR_RO(prod_id3),
1102 	__ATTR_RO(prod_id4),
1103 	__ATTR_RO(modalias),
1104 	__ATTR(allow_func_id_match, 0200, NULL, pcmcia_store_allow_func_id_match),
1105 	__ATTR_NULL,
1106 };
1107 
1108 /* PM support, also needed for reset */
1109 
1110 static int pcmcia_dev_suspend(struct device *dev, pm_message_t state)
1111 {
1112 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1113 	struct pcmcia_driver *p_drv = NULL;
1114 	int ret = 0;
1115 
1116 	mutex_lock(&p_dev->socket->ops_mutex);
1117 	if (p_dev->suspended) {
1118 		mutex_unlock(&p_dev->socket->ops_mutex);
1119 		return 0;
1120 	}
1121 	p_dev->suspended = 1;
1122 	mutex_unlock(&p_dev->socket->ops_mutex);
1123 
1124 	dev_dbg(dev, "suspending\n");
1125 
1126 	if (dev->driver)
1127 		p_drv = to_pcmcia_drv(dev->driver);
1128 
1129 	if (!p_drv)
1130 		goto out;
1131 
1132 	if (p_drv->suspend) {
1133 		ret = p_drv->suspend(p_dev);
1134 		if (ret) {
1135 			dev_printk(KERN_ERR, dev,
1136 				   "pcmcia: device %s (driver %s) did "
1137 				   "not want to go to sleep (%d)\n",
1138 				   p_dev->devname, p_drv->name, ret);
1139 			mutex_lock(&p_dev->socket->ops_mutex);
1140 			p_dev->suspended = 0;
1141 			mutex_unlock(&p_dev->socket->ops_mutex);
1142 			goto out;
1143 		}
1144 	}
1145 
1146 	if (p_dev->device_no == p_dev->func) {
1147 		dev_dbg(dev, "releasing configuration\n");
1148 		pcmcia_release_configuration(p_dev);
1149 	}
1150 
1151  out:
1152 	return ret;
1153 }
1154 
1155 
1156 static int pcmcia_dev_resume(struct device *dev)
1157 {
1158 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1159 	struct pcmcia_driver *p_drv = NULL;
1160 	int ret = 0;
1161 
1162 	mutex_lock(&p_dev->socket->ops_mutex);
1163 	if (!p_dev->suspended) {
1164 		mutex_unlock(&p_dev->socket->ops_mutex);
1165 		return 0;
1166 	}
1167 	p_dev->suspended = 0;
1168 	mutex_unlock(&p_dev->socket->ops_mutex);
1169 
1170 	dev_dbg(dev, "resuming\n");
1171 
1172 	if (dev->driver)
1173 		p_drv = to_pcmcia_drv(dev->driver);
1174 
1175 	if (!p_drv)
1176 		goto out;
1177 
1178 	if (p_dev->device_no == p_dev->func) {
1179 		dev_dbg(dev, "requesting configuration\n");
1180 		ret = pcmcia_enable_device(p_dev);
1181 		if (ret)
1182 			goto out;
1183 	}
1184 
1185 	if (p_drv->resume)
1186 		ret = p_drv->resume(p_dev);
1187 
1188  out:
1189 	return ret;
1190 }
1191 
1192 
1193 static int pcmcia_bus_suspend_callback(struct device *dev, void * _data)
1194 {
1195 	struct pcmcia_socket *skt = _data;
1196 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1197 
1198 	if (p_dev->socket != skt || p_dev->suspended)
1199 		return 0;
1200 
1201 	return runtime_suspend(dev);
1202 }
1203 
1204 static int pcmcia_bus_resume_callback(struct device *dev, void * _data)
1205 {
1206 	struct pcmcia_socket *skt = _data;
1207 	struct pcmcia_device *p_dev = to_pcmcia_dev(dev);
1208 
1209 	if (p_dev->socket != skt || !p_dev->suspended)
1210 		return 0;
1211 
1212 	runtime_resume(dev);
1213 
1214 	return 0;
1215 }
1216 
1217 static int pcmcia_bus_resume(struct pcmcia_socket *skt)
1218 {
1219 	dev_dbg(&skt->dev, "resuming socket %d\n", skt->sock);
1220 	bus_for_each_dev(&pcmcia_bus_type, NULL, skt, pcmcia_bus_resume_callback);
1221 	return 0;
1222 }
1223 
1224 static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
1225 {
1226 	dev_dbg(&skt->dev, "suspending socket %d\n", skt->sock);
1227 	if (bus_for_each_dev(&pcmcia_bus_type, NULL, skt,
1228 			     pcmcia_bus_suspend_callback)) {
1229 		pcmcia_bus_resume(skt);
1230 		return -EIO;
1231 	}
1232 	return 0;
1233 }
1234 
1235 static int pcmcia_bus_remove(struct pcmcia_socket *skt)
1236 {
1237 	atomic_set(&skt->present, 0);
1238 	pcmcia_card_remove(skt, NULL);
1239 
1240 	mutex_lock(&skt->ops_mutex);
1241 	destroy_cis_cache(skt);
1242 	pcmcia_cleanup_irq(skt);
1243 	mutex_unlock(&skt->ops_mutex);
1244 
1245 	return 0;
1246 }
1247 
1248 static int pcmcia_bus_add(struct pcmcia_socket *skt)
1249 {
1250 	atomic_set(&skt->present, 1);
1251 
1252 	mutex_lock(&skt->ops_mutex);
1253 	skt->pcmcia_pfc = 0;
1254 	destroy_cis_cache(skt); /* to be on the safe side... */
1255 	mutex_unlock(&skt->ops_mutex);
1256 
1257 	pcmcia_card_add(skt);
1258 
1259 	return 0;
1260 }
1261 
1262 static int pcmcia_bus_early_resume(struct pcmcia_socket *skt)
1263 {
1264 	if (!verify_cis_cache(skt))
1265 		return 0;
1266 
1267 	dev_dbg(&skt->dev, "cis mismatch - different card\n");
1268 
1269 	/* first, remove the card */
1270 	pcmcia_bus_remove(skt);
1271 
1272 	mutex_lock(&skt->ops_mutex);
1273 	destroy_cis_cache(skt);
1274 	kfree(skt->fake_cis);
1275 	skt->fake_cis = NULL;
1276 	skt->functions = 0;
1277 	mutex_unlock(&skt->ops_mutex);
1278 
1279 	/* now, add the new card */
1280 	pcmcia_bus_add(skt);
1281 	return 0;
1282 }
1283 
1284 
1285 /*
1286  * NOTE: This is racy. There's no guarantee the card will still be
1287  * physically present, even if the call to this function returns
1288  * non-NULL. Furthermore, the device driver most likely is unbound
1289  * almost immediately, so the timeframe where pcmcia_dev_present
1290  * returns NULL is probably really really small.
1291  */
1292 struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
1293 {
1294 	struct pcmcia_device *p_dev;
1295 	struct pcmcia_device *ret = NULL;
1296 
1297 	p_dev = pcmcia_get_dev(_p_dev);
1298 	if (!p_dev)
1299 		return NULL;
1300 
1301 	if (atomic_read(&p_dev->socket->present) != 0)
1302 		ret = p_dev;
1303 
1304 	pcmcia_put_dev(p_dev);
1305 	return ret;
1306 }
1307 EXPORT_SYMBOL(pcmcia_dev_present);
1308 
1309 
1310 static struct pcmcia_callback pcmcia_bus_callback = {
1311 	.owner = THIS_MODULE,
1312 	.add = pcmcia_bus_add,
1313 	.remove = pcmcia_bus_remove,
1314 	.requery = pcmcia_requery,
1315 	.validate = pccard_validate_cis,
1316 	.suspend = pcmcia_bus_suspend,
1317 	.early_resume = pcmcia_bus_early_resume,
1318 	.resume = pcmcia_bus_resume,
1319 };
1320 
1321 static int pcmcia_bus_add_socket(struct device *dev,
1322 					   struct class_interface *class_intf)
1323 {
1324 	struct pcmcia_socket *socket = dev_get_drvdata(dev);
1325 	int ret;
1326 
1327 	socket = pcmcia_get_socket(socket);
1328 	if (!socket) {
1329 		dev_printk(KERN_ERR, dev,
1330 			   "PCMCIA obtaining reference to socket failed\n");
1331 		return -ENODEV;
1332 	}
1333 
1334 	ret = sysfs_create_bin_file(&dev->kobj, &pccard_cis_attr);
1335 	if (ret) {
1336 		dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1337 		pcmcia_put_socket(socket);
1338 		return ret;
1339 	}
1340 
1341 	INIT_LIST_HEAD(&socket->devices_list);
1342 	socket->pcmcia_pfc = 0;
1343 	socket->device_count = 0;
1344 	atomic_set(&socket->present, 0);
1345 
1346 	ret = pccard_register_pcmcia(socket, &pcmcia_bus_callback);
1347 	if (ret) {
1348 		dev_printk(KERN_ERR, dev, "PCMCIA registration failed\n");
1349 		pcmcia_put_socket(socket);
1350 		return ret;
1351 	}
1352 
1353 	return 0;
1354 }
1355 
1356 static void pcmcia_bus_remove_socket(struct device *dev,
1357 				     struct class_interface *class_intf)
1358 {
1359 	struct pcmcia_socket *socket = dev_get_drvdata(dev);
1360 
1361 	if (!socket)
1362 		return;
1363 
1364 	pccard_register_pcmcia(socket, NULL);
1365 
1366 	/* unregister any unbound devices */
1367 	mutex_lock(&socket->skt_mutex);
1368 	pcmcia_card_remove(socket, NULL);
1369 	release_cis_mem(socket);
1370 	mutex_unlock(&socket->skt_mutex);
1371 
1372 	sysfs_remove_bin_file(&dev->kobj, &pccard_cis_attr);
1373 
1374 	pcmcia_put_socket(socket);
1375 
1376 	return;
1377 }
1378 
1379 
1380 /* the pcmcia_bus_interface is used to handle pcmcia socket devices */
1381 static struct class_interface pcmcia_bus_interface __refdata = {
1382 	.class = &pcmcia_socket_class,
1383 	.add_dev = &pcmcia_bus_add_socket,
1384 	.remove_dev = &pcmcia_bus_remove_socket,
1385 };
1386 
1387 
1388 struct bus_type pcmcia_bus_type = {
1389 	.name = "pcmcia",
1390 	.uevent = pcmcia_bus_uevent,
1391 	.match = pcmcia_bus_match,
1392 	.dev_attrs = pcmcia_dev_attrs,
1393 	.probe = pcmcia_device_probe,
1394 	.remove = pcmcia_device_remove,
1395 	.suspend = pcmcia_dev_suspend,
1396 	.resume = pcmcia_dev_resume,
1397 };
1398 
1399 
1400 static int __init init_pcmcia_bus(void)
1401 {
1402 	int ret;
1403 
1404 	ret = bus_register(&pcmcia_bus_type);
1405 	if (ret < 0) {
1406 		printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
1407 		return ret;
1408 	}
1409 	ret = class_interface_register(&pcmcia_bus_interface);
1410 	if (ret < 0) {
1411 		printk(KERN_WARNING
1412 			"pcmcia: class_interface_register error: %d\n", ret);
1413 		bus_unregister(&pcmcia_bus_type);
1414 		return ret;
1415 	}
1416 
1417 	return 0;
1418 }
1419 fs_initcall(init_pcmcia_bus); /* one level after subsys_initcall so that
1420 			       * pcmcia_socket_class is already registered */
1421 
1422 
1423 static void __exit exit_pcmcia_bus(void)
1424 {
1425 	class_interface_unregister(&pcmcia_bus_interface);
1426 
1427 	bus_unregister(&pcmcia_bus_type);
1428 }
1429 module_exit(exit_pcmcia_bus);
1430 
1431 
1432 MODULE_ALIAS("ds");
1433