aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/cio/chsc_sch.c
blob: f49f0e502b8dfb7f144801db8aa57d975a2dc7b7 (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
/*
 * Driver for s390 chsc subchannels
 *
 * Copyright IBM Corp. 2008
 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>

#include <asm/cio.h>
#include <asm/chsc.h>
#include <asm/isc.h>

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc_sch.h"
#include "ioasm.h"

static debug_info_t *chsc_debug_msg_id;
static debug_info_t *chsc_debug_log_id;

#define CHSC_MSG(imp, args...) do {					\
		debug_sprintf_event(chsc_debug_msg_id, imp , ##args);	\
	} while (0)

#define CHSC_LOG(imp, txt) do {					\
		debug_text_event(chsc_debug_log_id, imp , txt);	\
	} while (0)

static void CHSC_LOG_HEX(int level, void *data, int length)
{
	while (length > 0) {
		debug_event(chsc_debug_log_id, level, data, length);
		length -= chsc_debug_log_id->buf_size;
		data += chsc_debug_log_id->buf_size;
	}
}

MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("driver for s390 chsc subchannels");
MODULE_LICENSE("GPL");

static void chsc_subchannel_irq(struct subchannel *sch)
{
	struct chsc_private *private = sch->private;
	struct chsc_request *request = private->request;
	struct irb *irb = (struct irb *)__LC_IRB;

	CHSC_LOG(4, "irb");
	CHSC_LOG_HEX(4, irb, sizeof(*irb));
	/* Copy irb to provided request and set done. */
	if (!request) {
		CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
			 sch->schid.ssid, sch->schid.sch_no);
		return;
	}
	private->request = NULL;
	memcpy(&request->irb, irb, sizeof(*irb));
	stsch(sch->schid, &sch->schib);
	complete(&request->completion);
	put_device(&sch->dev);
}

static int chsc_subchannel_probe(struct subchannel *sch)
{
	struct chsc_private *private;
	int ret;

	CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
		 sch->schid.ssid, sch->schid.sch_no);
	sch->isc = CHSC_SCH_ISC;
	private = kzalloc(sizeof(*private), GFP_KERNEL);
	if (!private)
		return -ENOMEM;
	ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
	if (ret) {
		CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
			 sch->schid.ssid, sch->schid.sch_no, ret);
		kfree(private);
	} else {
		sch->private = private;
		if (sch->dev.uevent_suppress) {
			sch->dev.uevent_suppress = 0;
			kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
		}
	}
	return ret;
}

static int chsc_subchannel_remove(struct subchannel *sch)
{
	struct chsc_private *private;

	cio_disable_subchannel(sch);
	private = sch->private;
	sch->private = NULL;
	if (private->request) {
		complete(&private->request->completion);
		put_device(&sch->dev);
	}
	kfree(private);
	return 0;
}

static void chsc_subchannel_shutdown(struct subchannel *sch)
{
	cio_disable_subchannel(sch);
}

static struct css_device_id chsc_subchannel_ids[] = {
	{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
	{ /* end of list */ },
};
MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);

static struct css_driver chsc_subchannel_driver = {
	.owner = THIS_MODULE,
	.subchannel_type = chsc_subchannel_ids,
	.irq = chsc_subchannel_irq,
	.probe = chsc_subchannel_probe,
	.remove = chsc_subchannel_remove,
	.shutdown = chsc_subchannel_shutdown,
	.name = "chsc_subchannel",
};

static int __init chsc_init_dbfs(void)
{
	chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
					   16 * sizeof(long));
	if (!chsc_debug_msg_id)
		goto out;
	debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
	debug_set_level(chsc_debug_msg_id, 2);
	chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
	if (!chsc_debug_log_id)
		goto out;
	debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
	debug_set_level(chsc_debug_log_id, 2);
	return 0;
out:
	if (chsc_debug_msg_id)
		debug_unregister(chsc_debug_msg_id);
	return -ENOMEM;
}

static void chsc_remove_dbfs(void)
{
	debug_unregister(chsc_debug_log_id);
	debug_unregister(chsc_debug_msg_id);
}

static int __init chsc_init_sch_driver(void)
{
	return css_driver_register(&chsc_subchannel_driver);
}

static void chsc_cleanup_sch_driver(void)
{
	css_driver_unregister(&chsc_subchannel_driver);
}

static DEFINE_SPINLOCK(chsc_lock);

static int chsc_subchannel_match_next_free(struct device *dev, void *data)
{
	struct subchannel *sch = to_subchannel(dev);

	return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
}

static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
{
	struct device *dev;

	dev = driver_find_device(&chsc_subchannel_driver.drv,
				 sch ? &sch->dev : NULL, NULL,
				 chsc_subchannel_match_next_free);
	return dev ? to_subchannel(dev) : NULL;
}

/**
 * chsc_async() - try to start a chsc request asynchronously
 * @chsc_area: request to be started
 * @request: request structure to associate
 *
 * Tries to start a chsc request on one of the existing chsc subchannels.
 * Returns:
 *  %0 if the request was performed synchronously
 *  %-EINPROGRESS if the request was successfully started
 *  %-EBUSY if all chsc subchannels are busy
 *  %-ENODEV if no chsc subchannels are available
 * Context:
 *  interrupts disabled, chsc_lock held
 */
static int chsc_async(struct chsc_async_area *chsc_area,
		      struct chsc_request *request)
{
	int cc;
	struct chsc_private *private;
	struct subchannel *sch = NULL;
	int ret = -ENODEV;
	char dbf[10];

	chsc_area->header.key = PAGE_DEFAULT_KEY;
	while ((sch = chsc_get_next_subchannel(sch))) {
		spin_lock(sch->lock);
		private = sch->private;
		if (private->request) {
			spin_unlock(sch->lock);
			ret = -EBUSY;
			continue;
		}
		chsc_area->header.sid = sch->schid;
		CHSC_LOG(2, "schid");
		CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
		cc = chsc(chsc_area);
		sprintf(dbf, "cc:%d", cc);
		CHSC_LOG(2, dbf);
		switch (cc) {
		case 0:
			ret = 0;
			break;
		case 1:
			sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
			ret = -EINPROGRESS;
			private->request = request;
			break;
		case 2:
			ret = -EBUSY;
			break;
		default:
			ret = -ENODEV;
		}
		spin_unlock(sch->lock);
		CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
			 sch->schid.ssid, sch->schid.sch_no, cc);
		if (ret == -EINPROGRESS)
			return -EINPROGRESS;
		put_device(&sch->dev);
		if (ret == 0)
			return 0;
	}
	return ret;
}

static void chsc_log_command(struct chsc_async_area *chsc_area)
{
	char dbf[10];

	sprintf(dbf, "CHSC:%x", chsc_area->header.code);
	CHSC_LOG(0, dbf);
	CHSC_LOG_HEX(0, chsc_area, 32);
}

static int chsc_examine_irb(struct chsc_request *request)
{
	int backed_up;

	if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
		return -EIO;
	backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
	request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
	if (scsw_cstat(&request->irb.scsw) == 0)
		return 0;
	if (!backed_up)
		return 0;
	if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
		return -EIO;
	if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
		return -EPERM;
	if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
		return -EAGAIN;
	if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
		return -EAGAIN;
	return -EIO;
}

static int chsc_ioctl_start(void __user *user_area)
{
	struct chsc_request *request;
	struct chsc_async_area *chsc_area;
	int ret;
	char dbf[10];

	if (!css_general_characteristics.dynio)
		/* It makes no sense to try. */
		return -EOPNOTSUPP;
	chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
	if (!chsc_area)
		return -ENOMEM;
	request = kzalloc(sizeof(*request), GFP_KERNEL);
	if (!request) {
		ret = -ENOMEM;
		goto out_free;
	}
	init_completion(&request->completion);
	if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
		ret = -EFAULT;
		goto out_free;
	}
	chsc_log_command(chsc_area);
	spin_lock_irq(&chsc_lock);
	ret = chsc_async(chsc_area, request);
	spin_unlock_irq(&chsc_lock);
	if (ret == -EINPROGRESS) {
		wait_for_completion(&request->completion);
		ret = chsc_examine_irb(request);
	}
	/* copy area back to user */
	if (!ret)
		if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
			ret = -EFAULT;
out_free:
	sprintf(dbf, "ret:%d", ret);
	CHSC_LOG(0, dbf);
	kfree(request);
	free_page((unsigned long)chsc_area);
	return ret;
}

static int chsc_ioctl_info_channel_path(void __user *user_cd)
{
	struct chsc_chp_cd *cd;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 : 2;
		u32 m : 1;
		u32 : 1;
		u32 fmt1 : 4;
		u32 cssid : 8;
		u32 : 8;
		u32 first_chpid : 8;
		u32 : 24;
		u32 last_chpid : 8;
		u32 : 32;
		struct chsc_header response;
		u8 data[PAGE_SIZE - 20];
	} __attribute__ ((packed)) *scpcd_area;

	scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!scpcd_area)
		return -ENOMEM;
	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
	if (!cd) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(cd, user_cd, sizeof(*cd))) {
		ret = -EFAULT;
		goto out_free;
	}
	scpcd_area->request.length = 0x0010;
	scpcd_area->request.code = 0x0028;
	scpcd_area->m = cd->m;
	scpcd_area->fmt1 = cd->fmt;
	scpcd_area->cssid = cd->chpid.cssid;
	scpcd_area->first_chpid = cd->chpid.id;
	scpcd_area->last_chpid = cd->chpid.id;

	ccode = chsc(scpcd_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (scpcd_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "scpcd: response code=%x\n",
			 scpcd_area->response.code);
		goto out_free;
	}
	memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
	if (copy_to_user(user_cd, cd, sizeof(*cd)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(cd);
	free_page((unsigned long)scpcd_area);
	return ret;
}

static int chsc_ioctl_info_cu(void __user *user_cd)
{
	struct chsc_cu_cd *cd;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 : 2;
		u32 m : 1;
		u32 : 1;
		u32 fmt1 : 4;
		u32 cssid : 8;
		u32 : 8;
		u32 first_cun : 8;
		u32 : 24;
		u32 last_cun : 8;
		u32 : 32;
		struct chsc_header response;
		u8 data[PAGE_SIZE - 20];
	} __attribute__ ((packed)) *scucd_area;

	scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!scucd_area)
		return -ENOMEM;
	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
	if (!cd) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(cd, user_cd, sizeof(*cd))) {
		ret = -EFAULT;
		goto out_free;
	}
	scucd_area->request.length = 0x0010;
	scucd_area->request.code = 0x0028;
	scucd_area->m = cd->m;
	scucd_area->fmt1 = cd->fmt;
	scucd_area->cssid = cd->cssid;
	scucd_area->first_cun = cd->cun;
	scucd_area->last_cun = cd->cun;

	ccode = chsc(scucd_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (scucd_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "scucd: response code=%x\n",
			 scucd_area->response.code);
		goto out_free;
	}
	memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
	if (copy_to_user(user_cd, cd, sizeof(*cd)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(cd);
	free_page((unsigned long)scucd_area);
	return ret;
}

static int chsc_ioctl_info_sch_cu(void __user *user_cud)
{
	struct chsc_sch_cud *cud;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 : 2;
		u32 m : 1;
		u32 : 5;
		u32 fmt1 : 4;
		u32 : 2;
		u32 ssid : 2;
		u32 first_sch : 16;
		u32 : 8;
		u32 cssid : 8;
		u32 last_sch : 16;
		u32 : 32;
		struct chsc_header response;
		u8 data[PAGE_SIZE - 20];
	} __attribute__ ((packed)) *sscud_area;

	sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sscud_area)
		return -ENOMEM;
	cud = kzalloc(sizeof(*cud), GFP_KERNEL);
	if (!cud) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(cud, user_cud, sizeof(*cud))) {
		ret = -EFAULT;
		goto out_free;
	}
	sscud_area->request.length = 0x0010;
	sscud_area->request.code = 0x0006;
	sscud_area->m = cud->schid.m;
	sscud_area->fmt1 = cud->fmt;
	sscud_area->ssid = cud->schid.ssid;
	sscud_area->first_sch = cud->schid.sch_no;
	sscud_area->cssid = cud->schid.cssid;
	sscud_area->last_sch = cud->schid.sch_no;

	ccode = chsc(sscud_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (sscud_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "sscud: response code=%x\n",
			 sscud_area->response.code);
		goto out_free;
	}
	memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
	if (copy_to_user(user_cud, cud, sizeof(*cud)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(cud);
	free_page((unsigned long)sscud_area);
	return ret;
}

static int chsc_ioctl_conf_info(void __user *user_ci)
{
	struct chsc_conf_info *ci;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 : 2;
		u32 m : 1;
		u32 : 1;
		u32 fmt1 : 4;
		u32 cssid : 8;
		u32 : 6;
		u32 ssid : 2;
		u32 : 8;
		u64 : 64;
		struct chsc_header response;
		u8 data[PAGE_SIZE - 20];
	} __attribute__ ((packed)) *sci_area;

	sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sci_area)
		return -ENOMEM;
	ci = kzalloc(sizeof(*ci), GFP_KERNEL);
	if (!ci) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(ci, user_ci, sizeof(*ci))) {
		ret = -EFAULT;
		goto out_free;
	}
	sci_area->request.length = 0x0010;
	sci_area->request.code = 0x0012;
	sci_area->m = ci->id.m;
	sci_area->fmt1 = ci->fmt;
	sci_area->cssid = ci->id.cssid;
	sci_area->ssid = ci->id.ssid;

	ccode = chsc(sci_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (sci_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "sci: response code=%x\n",
			 sci_area->response.code);
		goto out_free;
	}
	memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
	if (copy_to_user(user_ci, ci, sizeof(*ci)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(ci);
	free_page((unsigned long)sci_area);
	return ret;
}

static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
{
	struct chsc_comp_list *ccl;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 ctype : 8;
		u32 : 4;
		u32 fmt : 4;
		u32 : 16;
		u64 : 64;
		u32 list_parm[2];
		u64 : 64;
		struct chsc_header response;
		u8 data[PAGE_SIZE - 36];
	} __attribute__ ((packed)) *sccl_area;
	struct {
		u32 m : 1;
		u32 : 31;
		u32 cssid : 8;
		u32 : 16;
		u32 chpid : 8;
	} __attribute__ ((packed)) *chpid_parm;
	struct {
		u32 f_cssid : 8;
		u32 l_cssid : 8;
		u32 : 16;
		u32 res;
	} __attribute__ ((packed)) *cssids_parm;

	sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccl_area)
		return -ENOMEM;
	ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
	if (!ccl) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
		ret = -EFAULT;
		goto out_free;
	}
	sccl_area->request.length = 0x0020;
	sccl_area->request.code = 0x0030;
	sccl_area->fmt = ccl->req.fmt;
	sccl_area->ctype = ccl->req.ctype;
	switch (sccl_area->ctype) {
	case CCL_CU_ON_CHP:
	case CCL_IOP_CHP:
		chpid_parm = (void *)&sccl_area->list_parm;
		chpid_parm->m = ccl->req.chpid.m;
		chpid_parm->cssid = ccl->req.chpid.chp.cssid;
		chpid_parm->chpid = ccl->req.chpid.chp.id;
		break;
	case CCL_CSS_IMG:
	case CCL_CSS_IMG_CONF_CHAR:
		cssids_parm = (void *)&sccl_area->list_parm;
		cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
		cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
		break;
	}
	ccode = chsc(sccl_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (sccl_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "sccl: response code=%x\n",
			 sccl_area->response.code);
		goto out_free;
	}
	memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
	if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(ccl);
	free_page((unsigned long)sccl_area);
	return ret;
}

static int chsc_ioctl_chpd(void __user *user_chpd)
{
	struct chsc_cpd_info *chpd;
	int ret;

	chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
	if (!chpd)
		return -ENOMEM;
	if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
		ret = -EFAULT;
		goto out_free;
	}
	ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
					       chpd->rfmt, chpd->c, chpd->m,
					       &chpd->chpdb);
	if (ret)
		goto out_free;
	if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
		ret = -EFAULT;
out_free:
	kfree(chpd);
	return ret;
}

static int chsc_ioctl_dcal(void __user *user_dcal)
{
	struct chsc_dcal *dcal;
	int ret, ccode;
	struct {
		struct chsc_header request;
		u32 atype : 8;
		u32 : 4;
		u32 fmt : 4;
		u32 : 16;
		u32 res0[2];
		u32 list_parm[2];
		u32 res1[2];
		struct chsc_header response;
		u8 data[PAGE_SIZE - 36];
	} __attribute__ ((packed)) *sdcal_area;

	sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sdcal_area)
		return -ENOMEM;
	dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
	if (!dcal) {
		ret = -ENOMEM;
		goto out_free;
	}
	if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
		ret = -EFAULT;
		goto out_free;
	}
	sdcal_area->request.length = 0x0020;
	sdcal_area->request.code = 0x0034;
	sdcal_area->atype = dcal->req.atype;
	sdcal_area->fmt = dcal->req.fmt;
	memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
	       sizeof(sdcal_area->list_parm));

	ccode = chsc(sdcal_area);
	if (ccode != 0) {
		ret = -EIO;
		goto out_free;
	}
	if (sdcal_area->response.code != 0x0001) {
		ret = -EIO;
		CHSC_MSG(0, "sdcal: response code=%x\n",
			 sdcal_area->response.code);
		goto out_free;
	}
	memcpy(&dcal->sdcal, &sdcal_area->response,
	       sdcal_area->response.length);
	if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
		ret = -EFAULT;
	else
		ret = 0;
out_free:
	kfree(dcal);
	free_page((unsigned long)sdcal_area);
	return ret;
}

static long chsc_ioctl(struct file *filp, unsigned int cmd,
		       unsigned long arg)
{
	CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
	switch (cmd) {
	case CHSC_START:
		return chsc_ioctl_start((void __user *)arg);
	case CHSC_INFO_CHANNEL_PATH:
		return chsc_ioctl_info_channel_path((void __user *)arg);
	case CHSC_INFO_CU:
		return chsc_ioctl_info_cu((void __user *)arg);
	case CHSC_INFO_SCH_CU:
		return chsc_ioctl_info_sch_cu((void __user *)arg);
	case CHSC_INFO_CI:
		return chsc_ioctl_conf_info((void __user *)arg);
	case CHSC_INFO_CCL:
		return chsc_ioctl_conf_comp_list((void __user *)arg);
	case CHSC_INFO_CPD:
		return chsc_ioctl_chpd((void __user *)arg);
	case CHSC_INFO_DCAL:
		return chsc_ioctl_dcal((void __user *)arg);
	default: /* unknown ioctl number */
		return -ENOIOCTLCMD;
	}
}

static const struct file_operations chsc_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = chsc_ioctl,
	.compat_ioctl = chsc_ioctl,
};

static struct miscdevice chsc_misc_device = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "chsc",
	.fops = &chsc_fops,
};

static int __init chsc_misc_init(void)
{
	return misc_register(&chsc_misc_device);
}

static void chsc_misc_cleanup(void)
{
	misc_deregister(&chsc_misc_device);
}

static int __init chsc_sch_init(void)
{
	int ret;

	ret = chsc_init_dbfs();
	if (ret)
		return ret;
	isc_register(CHSC_SCH_ISC);
	ret = chsc_init_sch_driver();
	if (ret)
		goto out_dbf;
	ret = chsc_misc_init();
	if (ret)
		goto out_driver;
	return ret;
out_driver:
	chsc_cleanup_sch_driver();
out_dbf:
	isc_unregister(CHSC_SCH_ISC);
	chsc_remove_dbfs();
	return ret;
}

static void __exit chsc_sch_exit(void)
{
	chsc_misc_cleanup();
	chsc_cleanup_sch_driver();
	isc_unregister(CHSC_SCH_ISC);
	chsc_remove_dbfs();
}

module_init(chsc_sch_init);
module_exit(chsc_sch_exit);