summaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/pcmcia_ioctl.c
blob: 30cf71d2ee235ce57cbef4d32600f63dd7b8f324 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
/*
 * pcmcia_ioctl.c -- ioctl interface for cardmgr and cardctl
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999		David A. Hinds
 * (C) 2003 - 2004	Dominik Brodowski
 */

/*
 * This file will go away soon.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/proc_fs.h>
#include <linux/poll.h>
#include <linux/pci.h>
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <linux/workqueue.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include <pcmcia/ss.h>

#include "cs_internal.h"

static int major_dev = -1;


/* Device user information */
#define MAX_EVENTS	32
#define USER_MAGIC	0x7ea4
#define CHECK_USER(u) \
    (((u) == NULL) || ((u)->user_magic != USER_MAGIC))

typedef struct user_info_t {
	u_int			user_magic;
	int			event_head, event_tail;
	event_t			event[MAX_EVENTS];
	struct user_info_t	*next;
	struct pcmcia_socket	*socket;
} user_info_t;


#ifdef CONFIG_PCMCIA_DEBUG
extern int ds_pc_debug;

#define ds_dbg(lvl, fmt, arg...) do {		\
	if (ds_pc_debug >= lvl)				\
		printk(KERN_DEBUG "ds: " fmt , ## arg);		\
} while (0)
#else
#define ds_dbg(lvl, fmt, arg...) do { } while (0)
#endif

static struct pcmcia_device *get_pcmcia_device(struct pcmcia_socket *s,
						unsigned int function)
{
	struct pcmcia_device *p_dev = NULL;
	unsigned long flags;

	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
	list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
		if (p_dev->func == function) {
			spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
			return pcmcia_get_dev(p_dev);
		}
	}
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
	return NULL;
}

/* backwards-compatible accessing of driver --- by name! */

static struct pcmcia_driver *get_pcmcia_driver(dev_info_t *dev_info)
{
	struct device_driver *drv;
	struct pcmcia_driver *p_drv;

	drv = driver_find((char *) dev_info, &pcmcia_bus_type);
	if (!drv)
		return NULL;

	p_drv = container_of(drv, struct pcmcia_driver, drv);

	return (p_drv);
}


#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_pccard = NULL;

static int proc_read_drivers_callback(struct device_driver *driver, void *_m)
{
	struct seq_file *m = _m;
	struct pcmcia_driver *p_drv = container_of(driver,
						   struct pcmcia_driver, drv);

	seq_printf(m, "%-24.24s 1 %d\n", p_drv->drv.name,
#ifdef CONFIG_MODULE_UNLOAD
		      (p_drv->owner) ? module_refcount(p_drv->owner) : 1
#else
		      1
#endif
	);
	return 0;
}

static int pccard_drivers_proc_show(struct seq_file *m, void *v)
{
	return bus_for_each_drv(&pcmcia_bus_type, NULL,
				m, proc_read_drivers_callback);
}

static int pccard_drivers_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, pccard_drivers_proc_show, NULL);
}

static const struct file_operations pccard_drivers_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= pccard_drivers_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif


#ifdef CONFIG_PCMCIA_PROBE

static int adjust_irq(struct pcmcia_socket *s, adjust_t *adj)
{
	int irq;
	u32 mask;

	irq = adj->resource.irq.IRQ;
	if ((irq < 0) || (irq > 15))
		return -EINVAL;

	if (adj->Action != REMOVE_MANAGED_RESOURCE)
		return 0;

	mask = 1 << irq;

	if (!(s->irq_mask & mask))
		return 0;

	s->irq_mask &= ~mask;

	return 0;
}

#else

static inline int adjust_irq(struct pcmcia_socket *s, adjust_t *adj) {
	return 0;
}

#endif

static int pcmcia_adjust_resource_info(adjust_t *adj)
{
	struct pcmcia_socket *s;
	int ret = -ENOSYS;
	unsigned long flags;

	down_read(&pcmcia_socket_list_rwsem);
	list_for_each_entry(s, &pcmcia_socket_list, socket_list) {

		if (adj->Resource == RES_IRQ)
			ret = adjust_irq(s, adj);

		else if (s->resource_ops->add_io) {
			unsigned long begin, end;

			/* you can't use the old interface if the new
			 * one was used before */
			spin_lock_irqsave(&s->lock, flags);
			if ((s->resource_setup_new) &&
			    !(s->resource_setup_old)) {
				spin_unlock_irqrestore(&s->lock, flags);
				continue;
			} else if (!(s->resource_setup_old))
				s->resource_setup_old = 1;
			spin_unlock_irqrestore(&s->lock, flags);

			switch (adj->Resource) {
			case RES_MEMORY_RANGE:
				begin = adj->resource.memory.Base;
				end = adj->resource.memory.Base + adj->resource.memory.Size - 1;
				if (s->resource_ops->add_mem)
					ret =s->resource_ops->add_mem(s, adj->Action, begin, end);
			case RES_IO_RANGE:
				begin = adj->resource.io.BasePort;
				end = adj->resource.io.BasePort + adj->resource.io.NumPorts - 1;
				if (s->resource_ops->add_io)
					ret = s->resource_ops->add_io(s, adj->Action, begin, end);
			}
			if (!ret) {
				/* as there's no way we know this is the
				 * last call to adjust_resource_info, we
				 * always need to assume this is the latest
				 * one... */
				spin_lock_irqsave(&s->lock, flags);
				s->resource_setup_done = 1;
				spin_unlock_irqrestore(&s->lock, flags);
			}
		}
	}
	up_read(&pcmcia_socket_list_rwsem);

	return (ret);
}

/** pccard_get_status
 *
 * Get the current socket state bits.  We don't support the latched
 * SocketState yet: I haven't seen any point for it.
 */

static int pccard_get_status(struct pcmcia_socket *s,
			     struct pcmcia_device *p_dev,
			     cs_status_t *status)
{
	config_t *c;
	int val;

	s->ops->get_status(s, &val);
	status->CardState = status->SocketState = 0;
	status->CardState |= (val & SS_DETECT) ? CS_EVENT_CARD_DETECT : 0;
	status->CardState |= (val & SS_CARDBUS) ? CS_EVENT_CB_DETECT : 0;
	status->CardState |= (val & SS_3VCARD) ? CS_EVENT_3VCARD : 0;
	status->CardState |= (val & SS_XVCARD) ? CS_EVENT_XVCARD : 0;
	if (s->state & SOCKET_SUSPEND)
		status->CardState |= CS_EVENT_PM_SUSPEND;
	if (!(s->state & SOCKET_PRESENT))
		return -ENODEV;

	c = (p_dev) ? p_dev->function_config : NULL;

	if ((c != NULL) && (c->state & CONFIG_LOCKED) &&
	    (c->IntType & (INT_MEMORY_AND_IO | INT_ZOOMED_VIDEO))) {
		u_char reg;
		if (c->CardValues & PRESENT_PIN_REPLACE) {
			pcmcia_read_cis_mem(s, 1, (c->ConfigBase+CISREG_PRR)>>1, 1, &reg);
			status->CardState |=
				(reg & PRR_WP_STATUS) ? CS_EVENT_WRITE_PROTECT : 0;
			status->CardState |=
				(reg & PRR_READY_STATUS) ? CS_EVENT_READY_CHANGE : 0;
			status->CardState |=
				(reg & PRR_BVD2_STATUS) ? CS_EVENT_BATTERY_LOW : 0;
			status->CardState |=
				(reg & PRR_BVD1_STATUS) ? CS_EVENT_BATTERY_DEAD : 0;
		} else {
			/* No PRR?  Then assume we're always ready */
			status->CardState |= CS_EVENT_READY_CHANGE;
		}
		if (c->CardValues & PRESENT_EXT_STATUS) {
			pcmcia_read_cis_mem(s, 1, (c->ConfigBase+CISREG_ESR)>>1, 1, &reg);
			status->CardState |=
				(reg & ESR_REQ_ATTN) ? CS_EVENT_REQUEST_ATTENTION : 0;
		}
		return 0;
	}
	status->CardState |=
		(val & SS_WRPROT) ? CS_EVENT_WRITE_PROTECT : 0;
	status->CardState |=
		(val & SS_BATDEAD) ? CS_EVENT_BATTERY_DEAD : 0;
	status->CardState |=
		(val & SS_BATWARN) ? CS_EVENT_BATTERY_LOW : 0;
	status->CardState |=
		(val & SS_READY) ? CS_EVENT_READY_CHANGE : 0;
	return 0;
} /* pccard_get_status */

static int pccard_get_configuration_info(struct pcmcia_socket *s,
				  struct pcmcia_device *p_dev,
				  config_info_t *config)
{
	config_t *c;

	if (!(s->state & SOCKET_PRESENT))
		return -ENODEV;


#ifdef CONFIG_CARDBUS
	if (s->state & SOCKET_CARDBUS) {
		memset(config, 0, sizeof(config_info_t));
		config->Vcc = s->socket.Vcc;
		config->Vpp1 = config->Vpp2 = s->socket.Vpp;
		config->Option = s->cb_dev->subordinate->number;
		if (s->state & SOCKET_CARDBUS_CONFIG) {
			config->Attributes = CONF_VALID_CLIENT;
			config->IntType = INT_CARDBUS;
			config->AssignedIRQ = s->irq.AssignedIRQ;
			if (config->AssignedIRQ)
				config->Attributes |= CONF_ENABLE_IRQ;
			if (s->io[0].res) {
				config->BasePort1 = s->io[0].res->start;
				config->NumPorts1 = s->io[0].res->end -
					config->BasePort1 + 1;
			}
		}
		return 0;
	}
#endif

	if (p_dev) {
		c = p_dev->function_config;
		config->Function = p_dev->func;
	} else {
		c = NULL;
		config->Function = 0;
	}

	if ((c == NULL) || !(c->state & CONFIG_LOCKED)) {
		config->Attributes = 0;
		config->Vcc = s->socket.Vcc;
		config->Vpp1 = config->Vpp2 = s->socket.Vpp;
		return 0;
	}

	config->Attributes = c->Attributes | CONF_VALID_CLIENT;
	config->Vcc = s->socket.Vcc;
	config->Vpp1 = config->Vpp2 = s->socket.Vpp;
	config->IntType = c->IntType;
	config->ConfigBase = c->ConfigBase;
	config->Status = c->Status;
	config->Pin = c->Pin;
	config->Copy = c->Copy;
	config->Option = c->Option;
	config->ExtStatus = c->ExtStatus;
	config->Present = config->CardValues = c->CardValues;
	config->IRQAttributes = c->irq.Attributes;
	config->AssignedIRQ = s->irq.AssignedIRQ;
	config->BasePort1 = c->io.BasePort1;
	config->NumPorts1 = c->io.NumPorts1;
	config->Attributes1 = c->io.Attributes1;
	config->BasePort2 = c->io.BasePort2;
	config->NumPorts2 = c->io.NumPorts2;
	config->Attributes2 = c->io.Attributes2;
	config->IOAddrLines = c->io.IOAddrLines;

	return 0;
} /* pccard_get_configuration_info */


/*======================================================================

    These manage a ring buffer of events pending for one user process

======================================================================*/


static int queue_empty(user_info_t *user)
{
    return (user->event_head == user->event_tail);
}

static event_t get_queued_event(user_info_t *user)
{
    user->event_tail = (user->event_tail+1) % MAX_EVENTS;
    return user->event[user->event_tail];
}

static void queue_event(user_info_t *user, event_t event)
{
    user->event_head = (user->event_head+1) % MAX_EVENTS;
    if (user->event_head == user->event_tail)
	user->event_tail = (user->event_tail+1) % MAX_EVENTS;
    user->event[user->event_head] = event;
}

void handle_event(struct pcmcia_socket *s, event_t event)
{
    user_info_t *user;
    for (user = s->user; user; user = user->next)
	queue_event(user, event);
    wake_up_interruptible(&s->queue);
}


/*======================================================================

    bind_request() and bind_device() are merged by now. Register_client()
    is called right at the end of bind_request(), during the driver's
    ->attach() call. Individual descriptions:

    bind_request() connects a socket to a particular client driver.
    It looks up the specified device ID in the list of registered
    drivers, binds it to the socket, and tries to create an instance
    of the device.  unbind_request() deletes a driver instance.

    Bind_device() associates a device driver with a particular socket.
    It is normally called by Driver Services after it has identified
    a newly inserted card.  An instance of that driver will then be
    eligible to register as a client of this socket.

    Register_client() uses the dev_info_t handle to match the
    caller with a socket.  The driver must have already been bound
    to a socket with bind_device() -- in fact, bind_device()
    allocates the client structure that will be used.

======================================================================*/

static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
{
	struct pcmcia_driver *p_drv;
	struct pcmcia_device *p_dev;
	int ret = 0;
	unsigned long flags;

	s = pcmcia_get_socket(s);
	if (!s)
		return -EINVAL;

	ds_dbg(2, "bind_request(%d, '%s')\n", s->sock,
	       (char *)bind_info->dev_info);

	p_drv = get_pcmcia_driver(&bind_info->dev_info);
	if (!p_drv) {
		ret = -EINVAL;
		goto err_put;
	}

	if (!try_module_get(p_drv->owner)) {
		ret = -EINVAL;
		goto err_put_driver;
	}

	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
        list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
		if (p_dev->func == bind_info->function) {
			if ((p_dev->dev.driver == &p_drv->drv)) {
				if (p_dev->cardmgr) {
					/* if there's already a device
					 * registered, and it was registered
					 * by userspace before, we need to
					 * return the "instance". */
					spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
					bind_info->instance = p_dev;
					ret = -EBUSY;
					goto err_put_module;
				} else {
					/* the correct driver managed to bind
					 * itself magically to the correct
					 * device. */
					spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
					p_dev->cardmgr = p_drv;
					ret = 0;
					goto err_put_module;
				}
			} else if (!p_dev->dev.driver) {
				/* there's already a device available where
				 * no device has been bound to yet. So we don't
				 * need to register a device! */
				spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
				goto rescan;
			}
		}
	}
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

	p_dev = pcmcia_device_add(s, bind_info->function);
	if (!p_dev) {
		ret = -EIO;
		goto err_put_module;
	}

rescan:
	p_dev->cardmgr = p_drv;

	/* if a driver is already running, we can abort */
	if (p_dev->dev.driver)
		goto err_put_module;

	/*
	 * Prevent this racing with a card insertion.
	 */
	mutex_lock(&s->skt_mutex);
	ret = bus_rescan_devices(&pcmcia_bus_type);
	mutex_unlock(&s->skt_mutex);
	if (ret)
		goto err_put_module;

	/* check whether the driver indeed matched. I don't care if this
	 * is racy or not, because it can only happen on cardmgr access
	 * paths...
	 */
	if (!(p_dev->dev.driver == &p_drv->drv))
		p_dev->cardmgr = NULL;

 err_put_module:
	module_put(p_drv->owner);
 err_put_driver:
	put_driver(&p_drv->drv);
 err_put:
	pcmcia_put_socket(s);

	return (ret);
} /* bind_request */

#ifdef CONFIG_CARDBUS

static struct pci_bus *pcmcia_lookup_bus(struct pcmcia_socket *s)
{
	if (!s || !(s->state & SOCKET_CARDBUS))
		return NULL;

	return s->cb_dev->subordinate;
}
#endif

static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int first)
{
	dev_node_t *node;
	struct pcmcia_device *p_dev;
	struct pcmcia_driver *p_drv;
	unsigned long flags;
	int ret = 0;

#ifdef CONFIG_CARDBUS
	/*
	 * Some unbelievably ugly code to associate the PCI cardbus
	 * device and its driver with the PCMCIA "bind" information.
	 */
	{
		struct pci_bus *bus;

		bus = pcmcia_lookup_bus(s);
		if (bus) {
			struct list_head *list;
			struct pci_dev *dev = NULL;

			list = bus->devices.next;
			while (list != &bus->devices) {
				struct pci_dev *pdev = pci_dev_b(list);
				list = list->next;

				if (first) {
					dev = pdev;
					break;
				}

				/* Try to handle "next" here some way? */
			}
			if (dev && dev->driver) {
				strlcpy(bind_info->name, dev->driver->name, DEV_NAME_LEN);
				bind_info->major = 0;
				bind_info->minor = 0;
				bind_info->next = NULL;
				return 0;
			}
		}
	}
#endif

	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
	list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
		if (p_dev->func == bind_info->function) {
			p_dev = pcmcia_get_dev(p_dev);
			if (!p_dev)
				continue;
			goto found;
		}
	}
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
	return -ENODEV;

 found:
	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);

	p_drv = to_pcmcia_drv(p_dev->dev.driver);
	if (p_drv && !p_dev->_locked) {
		ret = -EAGAIN;
		goto err_put;
	}

	if (first)
		node = p_dev->dev_node;
	else
		for (node = p_dev->dev_node; node; node = node->next)
			if (node == bind_info->next)
				break;
	if (!node) {
		ret = -ENODEV;
		goto err_put;
	}

	strlcpy(bind_info->name, node->dev_name, DEV_NAME_LEN);
	bind_info->major = node->major;
	bind_info->minor = node->minor;
	bind_info->next = node->next;

 err_put:
	pcmcia_put_dev(p_dev);
	return (ret);
} /* get_device_info */


static int ds_open(struct inode *inode, struct file *file)
{
    socket_t i = iminor(inode);
    struct pcmcia_socket *s;
    user_info_t *user;
    static int warning_printed = 0;
    int ret = 0;

    ds_dbg(0, "ds_open(socket %d)\n", i);

    lock_kernel();
    s = pcmcia_get_socket_by_nr(i);
    if (!s) {
	    ret = -ENODEV;
	    goto out;
    }
    s = pcmcia_get_socket(s);
    if (!s) {
	    ret = -ENODEV;
	    goto out;
    }

    if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
	    if (s->pcmcia_state.busy) {
		    pcmcia_put_socket(s);
		    ret = -EBUSY;
		    goto out;
	    }
	else
	    s->pcmcia_state.busy = 1;
    }

    user = kmalloc(sizeof(user_info_t), GFP_KERNEL);
    if (!user) {
	    pcmcia_put_socket(s);
	    ret = -ENOMEM;
	    goto out;
    }
    user->event_tail = user->event_head = 0;
    user->next = s->user;
    user->user_magic = USER_MAGIC;
    user->socket = s;
    s->user = user;
    file->private_data = user;

    if (!warning_printed) {
	    printk(KERN_INFO "pcmcia: Detected deprecated PCMCIA ioctl "
			"usage from process: %s.\n", current->comm);
	    printk(KERN_INFO "pcmcia: This interface will soon be removed from "
			"the kernel; please expect breakage unless you upgrade "
			"to new tools.\n");
	    printk(KERN_INFO "pcmcia: see http://www.kernel.org/pub/linux/"
			"utils/kernel/pcmcia/pcmcia.html for details.\n");
	    warning_printed = 1;
    }

    if (s->pcmcia_state.present)
	queue_event(user, CS_EVENT_CARD_INSERTION);
out:
    unlock_kernel();
    return ret;
} /* ds_open */

/*====================================================================*/

static int ds_release(struct inode *inode, struct file *file)
{
    struct pcmcia_socket *s;
    user_info_t *user, **link;

    ds_dbg(0, "ds_release(socket %d)\n", iminor(inode));

    user = file->private_data;
    if (CHECK_USER(user))
	goto out;

    s = user->socket;

    /* Unlink user data structure */
    if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
	s->pcmcia_state.busy = 0;
    }
    file->private_data = NULL;
    for (link = &s->user; *link; link = &(*link)->next)
	if (*link == user) break;
    if (link == NULL)
	goto out;
    *link = user->next;
    user->user_magic = 0;
    kfree(user);
    pcmcia_put_socket(s);
out:
    return 0;
} /* ds_release */

/*====================================================================*/

static ssize_t ds_read(struct file *file, char __user *buf,
		       size_t count, loff_t *ppos)
{
    struct pcmcia_socket *s;
    user_info_t *user;
    int ret;

    ds_dbg(2, "ds_read(socket %d)\n", iminor(file->f_path.dentry->d_inode));

    if (count < 4)
	return -EINVAL;

    user = file->private_data;
    if (CHECK_USER(user))
	return -EIO;

    s = user->socket;
    if (s->pcmcia_state.dead)
        return -EIO;

    ret = wait_event_interruptible(s->queue, !queue_empty(user));
    if (ret == 0)
	ret = put_user(get_queued_event(user), (int __user *)buf) ? -EFAULT : 4;

    return ret;
} /* ds_read */

/*====================================================================*/

static ssize_t ds_write(struct file *file, const char __user *buf,
			size_t count, loff_t *ppos)
{
    ds_dbg(2, "ds_write(socket %d)\n", iminor(file->f_path.dentry->d_inode));

    if (count != 4)
	return -EINVAL;
    if ((file->f_flags & O_ACCMODE) == O_RDONLY)
	return -EBADF;

    return -EIO;
} /* ds_write */

/*====================================================================*/

/* No kernel lock - fine */
static u_int ds_poll(struct file *file, poll_table *wait)
{
    struct pcmcia_socket *s;
    user_info_t *user;

    ds_dbg(2, "ds_poll(socket %d)\n", iminor(file->f_path.dentry->d_inode));

    user = file->private_data;
    if (CHECK_USER(user))
	return POLLERR;
    s = user->socket;
    /*
     * We don't check for a dead socket here since that
     * will send cardmgr into an endless spin.
     */
    poll_wait(file, &s->queue, wait);
    if (!queue_empty(user))
	return POLLIN | POLLRDNORM;
    return 0;
} /* ds_poll */

/*====================================================================*/

static int ds_ioctl(struct inode * inode, struct file * file,
		    u_int cmd, u_long arg)
{
    struct pcmcia_socket *s;
    void __user *uarg = (char __user *)arg;
    u_int size;
    int ret, err;
    ds_ioctl_arg_t *buf;
    user_info_t *user;

    ds_dbg(2, "ds_ioctl(socket %d, %#x, %#lx)\n", iminor(inode), cmd, arg);

    user = file->private_data;
    if (CHECK_USER(user))
	return -EIO;

    s = user->socket;
    if (s->pcmcia_state.dead)
        return -EIO;

    size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
    if (size > sizeof(ds_ioctl_arg_t)) return -EINVAL;

    /* Permission check */
    if (!(cmd & IOC_OUT) && !capable(CAP_SYS_ADMIN))
	return -EPERM;

    if (cmd & IOC_IN) {
	if (!access_ok(VERIFY_READ, uarg, size)) {
	    ds_dbg(3, "ds_ioctl(): verify_read = %d\n", -EFAULT);
	    return -EFAULT;
	}
    }
    if (cmd & IOC_OUT) {
	if (!access_ok(VERIFY_WRITE, uarg, size)) {
	    ds_dbg(3, "ds_ioctl(): verify_write = %d\n", -EFAULT);
	    return -EFAULT;
	}
    }
    buf = kmalloc(sizeof(ds_ioctl_arg_t), GFP_KERNEL);
    if (!buf)
	return -ENOMEM;

    err = ret = 0;

    if (cmd & IOC_IN) {
	if (__copy_from_user((char *)buf, uarg, size)) {
	    err = -EFAULT;
	    goto free_out;
	}
    }

    switch (cmd) {
    case DS_ADJUST_RESOURCE_INFO:
	ret = pcmcia_adjust_resource_info(&buf->adjust);
	break;
    case DS_GET_CONFIGURATION_INFO:
	if (buf->config.Function &&
	   (buf->config.Function >= s->functions))
	    ret = -EINVAL;
	else {
	    struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->config.Function);
	    ret = pccard_get_configuration_info(s, p_dev, &buf->config);
	    pcmcia_put_dev(p_dev);
	}
	break;
    case DS_GET_FIRST_TUPLE:
	mutex_lock(&s->skt_mutex);
	pcmcia_validate_mem(s);
	mutex_unlock(&s->skt_mutex);
	ret = pccard_get_first_tuple(s, BIND_FN_ALL, &buf->tuple);
	break;
    case DS_GET_NEXT_TUPLE:
	ret = pccard_get_next_tuple(s, BIND_FN_ALL, &buf->tuple);
	break;
    case DS_GET_TUPLE_DATA:
	buf->tuple.TupleData = buf->tuple_parse.data;
	buf->tuple.TupleDataMax = sizeof(buf->tuple_parse.data);
	ret = pccard_get_tuple_data(s, &buf->tuple);
	break;
    case DS_PARSE_TUPLE:
	buf->tuple.TupleData = buf->tuple_parse.data;
	ret = pcmcia_parse_tuple(&buf->tuple, &buf->tuple_parse.parse);
	break;
    case DS_RESET_CARD:
	ret = pcmcia_reset_card(s);
	break;
    case DS_GET_STATUS:
	    if (buf->status.Function &&
		(buf->status.Function >= s->functions))
		    ret = -EINVAL;
	    else {
		    struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->status.Function);
		    ret = pccard_get_status(s, p_dev, &buf->status);
		    pcmcia_put_dev(p_dev);
	    }
	    break;
    case DS_VALIDATE_CIS:
	mutex_lock(&s->skt_mutex);
	pcmcia_validate_mem(s);
	mutex_unlock(&s->skt_mutex);
	ret = pccard_validate_cis(s, &buf->cisinfo.Chains);
	break;
    case DS_SUSPEND_CARD:
	ret = pcmcia_suspend_card(s);
	break;
    case DS_RESUME_CARD:
	ret = pcmcia_resume_card(s);
	break;
    case DS_EJECT_CARD:
	err = pcmcia_eject_card(s);
	break;
    case DS_INSERT_CARD:
	err = pcmcia_insert_card(s);
	break;
    case DS_ACCESS_CONFIGURATION_REGISTER:
	if ((buf->conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN)) {
	    err = -EPERM;
	    goto free_out;
	}

	ret = -EINVAL;

	if (!(buf->conf_reg.Function &&
	     (buf->conf_reg.Function >= s->functions))) {
		struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->conf_reg.Function);
		if (p_dev) {
			ret = pcmcia_access_configuration_register(p_dev, &buf->conf_reg);
			pcmcia_put_dev(p_dev);
		}
	}
	break;
    case DS_GET_FIRST_REGION:
    case DS_GET_NEXT_REGION:
    case DS_BIND_MTD:
	if (!capable(CAP_SYS_ADMIN)) {
		err = -EPERM;
		goto free_out;
	} else {
			printk_once(KERN_WARNING
				"2.6. kernels use pcmciamtd instead of memory_cs.c and do not require special\n");
			printk_once(KERN_WARNING "MTD handling any more.\n");
	}
	err = -EINVAL;
	goto free_out;
	break;
    case DS_GET_FIRST_WINDOW:
	ret = pcmcia_get_window(s, &buf->win_info.handle, 0,
			&buf->win_info.window);
	break;
    case DS_GET_NEXT_WINDOW:
	ret = pcmcia_get_window(s, &buf->win_info.handle,
			buf->win_info.handle->index + 1, &buf->win_info.window);
	break;
    case DS_GET_MEM_PAGE:
	ret = pcmcia_get_mem_page(buf->win_info.handle,
			   &buf->win_info.map);
	break;
    case DS_REPLACE_CIS:
	ret = pcmcia_replace_cis(s, buf->cisdump.Data, buf->cisdump.Length);
	break;
    case DS_BIND_REQUEST:
	if (!capable(CAP_SYS_ADMIN)) {
		err = -EPERM;
		goto free_out;
	}
	err = bind_request(s, &buf->bind_info);
	break;
    case DS_GET_DEVICE_INFO:
	err = get_device_info(s, &buf->bind_info, 1);
	break;
    case DS_GET_NEXT_DEVICE:
	err = get_device_info(s, &buf->bind_info, 0);
	break;
    case DS_UNBIND_REQUEST:
	err = 0;
	break;
    default:
	err = -EINVAL;
    }

    if ((err == 0) && (ret != 0)) {
	ds_dbg(2, "ds_ioctl: ret = %d\n", ret);
	switch (ret) {
	case -ENODEV:
	case -EINVAL:
	case -EBUSY:
	case -ENOSYS:
	    err = ret;
	    break;
	case -ENOMEM:
	    err = -ENOSPC; break;
	case -ENOSPC:
	    err = -ENODATA; break;
	default:
	    err = -EIO; break;
	}
    }

    if (cmd & IOC_OUT) {
        if (__copy_to_user(uarg, (char *)buf, size))
            err = -EFAULT;
    }

free_out:
    kfree(buf);
    return err;
} /* ds_ioctl */

/*====================================================================*/

static const struct file_operations ds_fops = {
	.owner		= THIS_MODULE,
	.open		= ds_open,
	.release	= ds_release,
	.ioctl		= ds_ioctl,
	.read		= ds_read,
	.write		= ds_write,
	.poll		= ds_poll,
};

void __init pcmcia_setup_ioctl(void) {
	int i;

	/* Set up character device for user mode clients */
	i = register_chrdev(0, "pcmcia", &ds_fops);
	if (i < 0)
		printk(KERN_NOTICE "unable to find a free device # for "
		       "Driver Services (error=%d)\n", i);
	else
		major_dev = i;

#ifdef CONFIG_PROC_FS
	proc_pccard = proc_mkdir("bus/pccard", NULL);
	if (proc_pccard)
		proc_create("drivers", 0, proc_pccard, &pccard_drivers_proc_fops);
#endif
}


void __exit pcmcia_cleanup_ioctl(void) {
#ifdef CONFIG_PROC_FS
	if (proc_pccard) {
		remove_proc_entry("drivers", proc_pccard);
		remove_proc_entry("bus/pccard", NULL);
	}
#endif
	if (major_dev != -1)
		unregister_chrdev(major_dev, "pcmcia");
}
OpenPOWER on IntegriCloud