aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/mc13xxx-core.c
blob: 9fd4f63c45cc18b2e60dc41085425ff3d35f04b8 (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
/*
 * Copyright 2009-2010 Pengutronix
 * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
 *
 * loosely based on an earlier driver that has
 * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
 *
 * 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.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mc13xxx.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>

struct mc13xxx {
	struct spi_device *spidev;
	struct mutex lock;
	int irq;
	int flags;

	irq_handler_t irqhandler[MC13XXX_NUM_IRQ];
	void *irqdata[MC13XXX_NUM_IRQ];

	int adcflags;
};

#define MC13XXX_IRQSTAT0	0
#define MC13XXX_IRQSTAT0_ADCDONEI	(1 << 0)
#define MC13XXX_IRQSTAT0_ADCBISDONEI	(1 << 1)
#define MC13XXX_IRQSTAT0_TSI		(1 << 2)
#define MC13783_IRQSTAT0_WHIGHI		(1 << 3)
#define MC13783_IRQSTAT0_WLOWI		(1 << 4)
#define MC13XXX_IRQSTAT0_CHGDETI	(1 << 6)
#define MC13783_IRQSTAT0_CHGOVI		(1 << 7)
#define MC13XXX_IRQSTAT0_CHGREVI	(1 << 8)
#define MC13XXX_IRQSTAT0_CHGSHORTI	(1 << 9)
#define MC13XXX_IRQSTAT0_CCCVI		(1 << 10)
#define MC13XXX_IRQSTAT0_CHGCURRI	(1 << 11)
#define MC13XXX_IRQSTAT0_BPONI		(1 << 12)
#define MC13XXX_IRQSTAT0_LOBATLI	(1 << 13)
#define MC13XXX_IRQSTAT0_LOBATHI	(1 << 14)
#define MC13783_IRQSTAT0_UDPI		(1 << 15)
#define MC13783_IRQSTAT0_USBI		(1 << 16)
#define MC13783_IRQSTAT0_IDI		(1 << 19)
#define MC13783_IRQSTAT0_SE1I		(1 << 21)
#define MC13783_IRQSTAT0_CKDETI		(1 << 22)
#define MC13783_IRQSTAT0_UDMI		(1 << 23)

#define MC13XXX_IRQMASK0	1
#define MC13XXX_IRQMASK0_ADCDONEM	MC13XXX_IRQSTAT0_ADCDONEI
#define MC13XXX_IRQMASK0_ADCBISDONEM	MC13XXX_IRQSTAT0_ADCBISDONEI
#define MC13XXX_IRQMASK0_TSM		MC13XXX_IRQSTAT0_TSI
#define MC13783_IRQMASK0_WHIGHM		MC13783_IRQSTAT0_WHIGHI
#define MC13783_IRQMASK0_WLOWM		MC13783_IRQSTAT0_WLOWI
#define MC13XXX_IRQMASK0_CHGDETM	MC13XXX_IRQSTAT0_CHGDETI
#define MC13783_IRQMASK0_CHGOVM		MC13783_IRQSTAT0_CHGOVI
#define MC13XXX_IRQMASK0_CHGREVM	MC13XXX_IRQSTAT0_CHGREVI
#define MC13XXX_IRQMASK0_CHGSHORTM	MC13XXX_IRQSTAT0_CHGSHORTI
#define MC13XXX_IRQMASK0_CCCVM		MC13XXX_IRQSTAT0_CCCVI
#define MC13XXX_IRQMASK0_CHGCURRM	MC13XXX_IRQSTAT0_CHGCURRI
#define MC13XXX_IRQMASK0_BPONM		MC13XXX_IRQSTAT0_BPONI
#define MC13XXX_IRQMASK0_LOBATLM	MC13XXX_IRQSTAT0_LOBATLI
#define MC13XXX_IRQMASK0_LOBATHM	MC13XXX_IRQSTAT0_LOBATHI
#define MC13783_IRQMASK0_UDPM		MC13783_IRQSTAT0_UDPI
#define MC13783_IRQMASK0_USBM		MC13783_IRQSTAT0_USBI
#define MC13783_IRQMASK0_IDM		MC13783_IRQSTAT0_IDI
#define MC13783_IRQMASK0_SE1M		MC13783_IRQSTAT0_SE1I
#define MC13783_IRQMASK0_CKDETM		MC13783_IRQSTAT0_CKDETI
#define MC13783_IRQMASK0_UDMM		MC13783_IRQSTAT0_UDMI

#define MC13XXX_IRQSTAT1	3
#define MC13XXX_IRQSTAT1_1HZI		(1 << 0)
#define MC13XXX_IRQSTAT1_TODAI		(1 << 1)
#define MC13783_IRQSTAT1_ONOFD1I	(1 << 3)
#define MC13783_IRQSTAT1_ONOFD2I	(1 << 4)
#define MC13783_IRQSTAT1_ONOFD3I	(1 << 5)
#define MC13XXX_IRQSTAT1_SYSRSTI	(1 << 6)
#define MC13XXX_IRQSTAT1_RTCRSTI	(1 << 7)
#define MC13XXX_IRQSTAT1_PCI		(1 << 8)
#define MC13XXX_IRQSTAT1_WARMI		(1 << 9)
#define MC13XXX_IRQSTAT1_MEMHLDI	(1 << 10)
#define MC13783_IRQSTAT1_PWRRDYI	(1 << 11)
#define MC13XXX_IRQSTAT1_THWARNLI	(1 << 12)
#define MC13XXX_IRQSTAT1_THWARNHI	(1 << 13)
#define MC13XXX_IRQSTAT1_CLKI		(1 << 14)
#define MC13783_IRQSTAT1_SEMAFI		(1 << 15)
#define MC13783_IRQSTAT1_MC2BI		(1 << 17)
#define MC13783_IRQSTAT1_HSDETI		(1 << 18)
#define MC13783_IRQSTAT1_HSLI		(1 << 19)
#define MC13783_IRQSTAT1_ALSPTHI	(1 << 20)
#define MC13783_IRQSTAT1_AHSSHORTI	(1 << 21)

#define MC13XXX_IRQMASK1	4
#define MC13XXX_IRQMASK1_1HZM		MC13XXX_IRQSTAT1_1HZI
#define MC13XXX_IRQMASK1_TODAM		MC13XXX_IRQSTAT1_TODAI
#define MC13783_IRQMASK1_ONOFD1M	MC13783_IRQSTAT1_ONOFD1I
#define MC13783_IRQMASK1_ONOFD2M	MC13783_IRQSTAT1_ONOFD2I
#define MC13783_IRQMASK1_ONOFD3M	MC13783_IRQSTAT1_ONOFD3I
#define MC13XXX_IRQMASK1_SYSRSTM	MC13XXX_IRQSTAT1_SYSRSTI
#define MC13XXX_IRQMASK1_RTCRSTM	MC13XXX_IRQSTAT1_RTCRSTI
#define MC13XXX_IRQMASK1_PCM		MC13XXX_IRQSTAT1_PCI
#define MC13XXX_IRQMASK1_WARMM		MC13XXX_IRQSTAT1_WARMI
#define MC13XXX_IRQMASK1_MEMHLDM	MC13XXX_IRQSTAT1_MEMHLDI
#define MC13783_IRQMASK1_PWRRDYM	MC13783_IRQSTAT1_PWRRDYI
#define MC13XXX_IRQMASK1_THWARNLM	MC13XXX_IRQSTAT1_THWARNLI
#define MC13XXX_IRQMASK1_THWARNHM	MC13XXX_IRQSTAT1_THWARNHI
#define MC13XXX_IRQMASK1_CLKM		MC13XXX_IRQSTAT1_CLKI
#define MC13783_IRQMASK1_SEMAFM		MC13783_IRQSTAT1_SEMAFI
#define MC13783_IRQMASK1_MC2BM		MC13783_IRQSTAT1_MC2BI
#define MC13783_IRQMASK1_HSDETM		MC13783_IRQSTAT1_HSDETI
#define MC13783_IRQMASK1_HSLM		MC13783_IRQSTAT1_HSLI
#define MC13783_IRQMASK1_ALSPTHM	MC13783_IRQSTAT1_ALSPTHI
#define MC13783_IRQMASK1_AHSSHORTM	MC13783_IRQSTAT1_AHSSHORTI

#define MC13XXX_REVISION	7
#define MC13XXX_REVISION_REVMETAL	(0x07 <<  0)
#define MC13XXX_REVISION_REVFULL	(0x03 <<  3)
#define MC13XXX_REVISION_ICID		(0x07 <<  6)
#define MC13XXX_REVISION_FIN		(0x03 <<  9)
#define MC13XXX_REVISION_FAB		(0x03 << 11)
#define MC13XXX_REVISION_ICIDCODE	(0x3f << 13)

#define MC13XXX_ADC1		44
#define MC13XXX_ADC1_ADEN		(1 << 0)
#define MC13XXX_ADC1_RAND		(1 << 1)
#define MC13XXX_ADC1_ADSEL		(1 << 3)
#define MC13XXX_ADC1_ASC		(1 << 20)
#define MC13XXX_ADC1_ADTRIGIGN		(1 << 21)

#define MC13XXX_ADC2		45

#define MC13XXX_NUMREGS 0x3f

void mc13xxx_lock(struct mc13xxx *mc13xxx)
{
	if (!mutex_trylock(&mc13xxx->lock)) {
		dev_dbg(&mc13xxx->spidev->dev, "wait for %s from %pf\n",
				__func__, __builtin_return_address(0));

		mutex_lock(&mc13xxx->lock);
	}
	dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n",
			__func__, __builtin_return_address(0));
}
EXPORT_SYMBOL(mc13xxx_lock);

void mc13xxx_unlock(struct mc13xxx *mc13xxx)
{
	dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n",
			__func__, __builtin_return_address(0));
	mutex_unlock(&mc13xxx->lock);
}
EXPORT_SYMBOL(mc13xxx_unlock);

#define MC13XXX_REGOFFSET_SHIFT 25
int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
{
	struct spi_transfer t;
	struct spi_message m;
	int ret;

	BUG_ON(!mutex_is_locked(&mc13xxx->lock));

	if (offset > MC13XXX_NUMREGS)
		return -EINVAL;

	*val = offset << MC13XXX_REGOFFSET_SHIFT;

	memset(&t, 0, sizeof(t));

	t.tx_buf = val;
	t.rx_buf = val;
	t.len = sizeof(u32);

	spi_message_init(&m);
	spi_message_add_tail(&t, &m);

	ret = spi_sync(mc13xxx->spidev, &m);

	/* error in message.status implies error return from spi_sync */
	BUG_ON(!ret && m.status);

	if (ret)
		return ret;

	*val &= 0xffffff;

	dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] -> 0x%06x\n", offset, *val);

	return 0;
}
EXPORT_SYMBOL(mc13xxx_reg_read);

int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
{
	u32 buf;
	struct spi_transfer t;
	struct spi_message m;
	int ret;

	BUG_ON(!mutex_is_locked(&mc13xxx->lock));

	dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] <- 0x%06x\n", offset, val);

	if (offset > MC13XXX_NUMREGS || val > 0xffffff)
		return -EINVAL;

	buf = 1 << 31 | offset << MC13XXX_REGOFFSET_SHIFT | val;

	memset(&t, 0, sizeof(t));

	t.tx_buf = &buf;
	t.rx_buf = &buf;
	t.len = sizeof(u32);

	spi_message_init(&m);
	spi_message_add_tail(&t, &m);

	ret = spi_sync(mc13xxx->spidev, &m);

	BUG_ON(!ret && m.status);

	if (ret)
		return ret;

	return 0;
}
EXPORT_SYMBOL(mc13xxx_reg_write);

int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
		u32 mask, u32 val)
{
	int ret;
	u32 valread;

	BUG_ON(val & ~mask);

	ret = mc13xxx_reg_read(mc13xxx, offset, &valread);
	if (ret)
		return ret;

	valread = (valread & ~mask) | val;

	return mc13xxx_reg_write(mc13xxx, offset, valread);
}
EXPORT_SYMBOL(mc13xxx_reg_rmw);

int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq)
{
	int ret;
	unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
	u32 mask;

	if (irq < 0 || irq >= MC13XXX_NUM_IRQ)
		return -EINVAL;

	ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
	if (ret)
		return ret;

	if (mask & irqbit)
		/* already masked */
		return 0;

	return mc13xxx_reg_write(mc13xxx, offmask, mask | irqbit);
}
EXPORT_SYMBOL(mc13xxx_irq_mask);

int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq)
{
	int ret;
	unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
	u32 mask;

	if (irq < 0 || irq >= MC13XXX_NUM_IRQ)
		return -EINVAL;

	ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
	if (ret)
		return ret;

	if (!(mask & irqbit))
		/* already unmasked */
		return 0;

	return mc13xxx_reg_write(mc13xxx, offmask, mask & ~irqbit);
}
EXPORT_SYMBOL(mc13xxx_irq_unmask);

int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq,
		int *enabled, int *pending)
{
	int ret;
	unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
	unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
	u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);

	if (irq < 0 || irq >= MC13XXX_NUM_IRQ)
		return -EINVAL;

	if (enabled) {
		u32 mask;

		ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
		if (ret)
			return ret;

		*enabled = mask & irqbit;
	}

	if (pending) {
		u32 stat;

		ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
		if (ret)
			return ret;

		*pending = stat & irqbit;
	}

	return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_status);

int mc13xxx_irq_ack(struct mc13xxx *mc13xxx, int irq)
{
	unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
	unsigned int val = 1 << (irq < 24 ? irq : irq - 24);

	BUG_ON(irq < 0 || irq >= MC13XXX_NUM_IRQ);

	return mc13xxx_reg_write(mc13xxx, offstat, val);
}
EXPORT_SYMBOL(mc13xxx_irq_ack);

int mc13xxx_irq_request_nounmask(struct mc13xxx *mc13xxx, int irq,
		irq_handler_t handler, const char *name, void *dev)
{
	BUG_ON(!mutex_is_locked(&mc13xxx->lock));
	BUG_ON(!handler);

	if (irq < 0 || irq >= MC13XXX_NUM_IRQ)
		return -EINVAL;

	if (mc13xxx->irqhandler[irq])
		return -EBUSY;

	mc13xxx->irqhandler[irq] = handler;
	mc13xxx->irqdata[irq] = dev;

	return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_request_nounmask);

int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq,
		irq_handler_t handler, const char *name, void *dev)
{
	int ret;

	ret = mc13xxx_irq_request_nounmask(mc13xxx, irq, handler, name, dev);
	if (ret)
		return ret;

	ret = mc13xxx_irq_unmask(mc13xxx, irq);
	if (ret) {
		mc13xxx->irqhandler[irq] = NULL;
		mc13xxx->irqdata[irq] = NULL;
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_request);

int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev)
{
	int ret;
	BUG_ON(!mutex_is_locked(&mc13xxx->lock));

	if (irq < 0 || irq >= MC13XXX_NUM_IRQ || !mc13xxx->irqhandler[irq] ||
			mc13xxx->irqdata[irq] != dev)
		return -EINVAL;

	ret = mc13xxx_irq_mask(mc13xxx, irq);
	if (ret)
		return ret;

	mc13xxx->irqhandler[irq] = NULL;
	mc13xxx->irqdata[irq] = NULL;

	return 0;
}
EXPORT_SYMBOL(mc13xxx_irq_free);

static inline irqreturn_t mc13xxx_irqhandler(struct mc13xxx *mc13xxx, int irq)
{
	return mc13xxx->irqhandler[irq](irq, mc13xxx->irqdata[irq]);
}

/*
 * returns: number of handled irqs or negative error
 * locking: holds mc13xxx->lock
 */
static int mc13xxx_irq_handle(struct mc13xxx *mc13xxx,
		unsigned int offstat, unsigned int offmask, int baseirq)
{
	u32 stat, mask;
	int ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
	int num_handled = 0;

	if (ret)
		return ret;

	ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
	if (ret)
		return ret;

	while (stat & ~mask) {
		int irq = __ffs(stat & ~mask);

		stat &= ~(1 << irq);

		if (likely(mc13xxx->irqhandler[baseirq + irq])) {
			irqreturn_t handled;

			handled = mc13xxx_irqhandler(mc13xxx, baseirq + irq);
			if (handled == IRQ_HANDLED)
				num_handled++;
		} else {
			dev_err(&mc13xxx->spidev->dev,
					"BUG: irq %u but no handler\n",
					baseirq + irq);

			mask |= 1 << irq;

			ret = mc13xxx_reg_write(mc13xxx, offmask, mask);
		}
	}

	return num_handled;
}

static irqreturn_t mc13xxx_irq_thread(int irq, void *data)
{
	struct mc13xxx *mc13xxx = data;
	irqreturn_t ret;
	int handled = 0;

	mc13xxx_lock(mc13xxx);

	ret = mc13xxx_irq_handle(mc13xxx, MC13XXX_IRQSTAT0,
			MC13XXX_IRQMASK0, 0);
	if (ret > 0)
		handled = 1;

	ret = mc13xxx_irq_handle(mc13xxx, MC13XXX_IRQSTAT1,
			MC13XXX_IRQMASK1, 24);
	if (ret > 0)
		handled = 1;

	mc13xxx_unlock(mc13xxx);

	return IRQ_RETVAL(handled);
}

enum mc13xxx_id {
	MC13XXX_ID_MC13783,
	MC13XXX_ID_MC13892,
	MC13XXX_ID_INVALID,
};

static const char *mc13xxx_chipname[] = {
	[MC13XXX_ID_MC13783] = "mc13783",
	[MC13XXX_ID_MC13892] = "mc13892",
};

#define maskval(reg, mask)	(((reg) & (mask)) >> __ffs(mask))
static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id)
{
	u32 icid;
	u32 revision;
	const char *name;
	int ret;

	ret = mc13xxx_reg_read(mc13xxx, 46, &icid);
	if (ret)
		return ret;

	icid = (icid >> 6) & 0x7;

	switch (icid) {
	case 2:
		*id = MC13XXX_ID_MC13783;
		name = "mc13783";
		break;
	case 7:
		*id = MC13XXX_ID_MC13892;
		name = "mc13892";
		break;
	default:
		*id = MC13XXX_ID_INVALID;
		break;
	}

	if (*id == MC13XXX_ID_MC13783 || *id == MC13XXX_ID_MC13892) {
		ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
		if (ret)
			return ret;

		dev_info(&mc13xxx->spidev->dev, "%s: rev: %d.%d, "
				"fin: %d, fab: %d, icid: %d/%d\n",
				mc13xxx_chipname[*id],
				maskval(revision, MC13XXX_REVISION_REVFULL),
				maskval(revision, MC13XXX_REVISION_REVMETAL),
				maskval(revision, MC13XXX_REVISION_FIN),
				maskval(revision, MC13XXX_REVISION_FAB),
				maskval(revision, MC13XXX_REVISION_ICID),
				maskval(revision, MC13XXX_REVISION_ICIDCODE));
	}

	if (*id != MC13XXX_ID_INVALID) {
		const struct spi_device_id *devid =
			spi_get_device_id(mc13xxx->spidev);
		if (!devid || devid->driver_data != *id)
			dev_warn(&mc13xxx->spidev->dev, "device id doesn't "
					"match auto detection!\n");
	}

	return 0;
}

static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
{
	const struct spi_device_id *devid =
		spi_get_device_id(mc13xxx->spidev);

	if (!devid)
		return NULL;

	return mc13xxx_chipname[devid->driver_data];
}

int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
{
	return mc13xxx->flags;
}
EXPORT_SYMBOL(mc13xxx_get_flags);

#define MC13XXX_ADC1_CHAN0_SHIFT	5
#define MC13XXX_ADC1_CHAN1_SHIFT	8
#define MC13783_ADC1_ATO_SHIFT		11
#define MC13783_ADC1_ATOX		(1 << 19)

struct mc13xxx_adcdone_data {
	struct mc13xxx *mc13xxx;
	struct completion done;
};

static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
{
	struct mc13xxx_adcdone_data *adcdone_data = data;

	mc13xxx_irq_ack(adcdone_data->mc13xxx, irq);

	complete_all(&adcdone_data->done);

	return IRQ_HANDLED;
}

#define MC13XXX_ADC_WORKING (1 << 0)

int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
		unsigned int channel, u8 ato, bool atox,
		unsigned int *sample)
{
	u32 adc0, adc1, old_adc0;
	int i, ret;
	struct mc13xxx_adcdone_data adcdone_data = {
		.mc13xxx = mc13xxx,
	};
	init_completion(&adcdone_data.done);

	dev_dbg(&mc13xxx->spidev->dev, "%s\n", __func__);

	mc13xxx_lock(mc13xxx);

	if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
		ret = -EBUSY;
		goto out;
	}

	mc13xxx->adcflags |= MC13XXX_ADC_WORKING;

	mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);

	adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2;
	adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;

	if (channel > 7)
		adc1 |= MC13XXX_ADC1_ADSEL;

	switch (mode) {
	case MC13XXX_ADC_MODE_TS:
		adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 |
			MC13XXX_ADC0_TSMOD1;
		adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
		break;

	case MC13XXX_ADC_MODE_SINGLE_CHAN:
		adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
		adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
		adc1 |= MC13XXX_ADC1_RAND;
		break;

	case MC13XXX_ADC_MODE_MULT_CHAN:
		adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
		adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
		break;

	default:
		mc13xxx_unlock(mc13xxx);
		return -EINVAL;
	}

	adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
	if (atox)
		adc1 |= MC13783_ADC1_ATOX;
	dev_dbg(&mc13xxx->spidev->dev, "%s: request irq\n", __func__);
	mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
			mc13xxx_handler_adcdone, __func__, &adcdone_data);
	mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_ADCDONE);

	mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
	mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);

	mc13xxx_unlock(mc13xxx);

	ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);

	if (!ret)
		ret = -ETIMEDOUT;

	mc13xxx_lock(mc13xxx);

	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data);

	if (ret > 0)
		for (i = 0; i < 4; ++i) {
			ret = mc13xxx_reg_read(mc13xxx,
					MC13XXX_ADC2, &sample[i]);
			if (ret)
				break;
		}

	if (mode == MC13XXX_ADC_MODE_TS)
		/* restore TSMOD */
		mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);

	mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
out:
	mc13xxx_unlock(mc13xxx);

	return ret;
}
EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);

static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
		const char *format, void *pdata, size_t pdata_size)
{
	char buf[30];
	const char *name = mc13xxx_get_chipname(mc13xxx);

	struct mfd_cell cell = {
		.platform_data = pdata,
		.pdata_size = pdata_size,
	};

	/* there is no asnprintf in the kernel :-( */
	if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
		return -E2BIG;

	cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
	if (!cell.name)
		return -ENOMEM;

	return mfd_add_devices(&mc13xxx->spidev->dev, -1, &cell, 1, NULL, 0);
}

static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
{
	return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
}

#ifdef CONFIG_OF
static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
{
	struct device_node *np = mc13xxx->spidev->dev.of_node;

	if (!np)
		return -ENODEV;

	if (of_get_property(np, "fsl,mc13xxx-uses-adc", NULL))
		mc13xxx->flags |= MC13XXX_USE_ADC;

	if (of_get_property(np, "fsl,mc13xxx-uses-codec", NULL))
		mc13xxx->flags |= MC13XXX_USE_CODEC;

	if (of_get_property(np, "fsl,mc13xxx-uses-rtc", NULL))
		mc13xxx->flags |= MC13XXX_USE_RTC;

	if (of_get_property(np, "fsl,mc13xxx-uses-touch", NULL))
		mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;

	return 0;
}
#else
static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
{
	return -ENODEV;
}
#endif

static const struct spi_device_id mc13xxx_device_id[] = {
	{
		.name = "mc13783",
		.driver_data = MC13XXX_ID_MC13783,
	}, {
		.name = "mc13892",
		.driver_data = MC13XXX_ID_MC13892,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);

static const struct of_device_id mc13xxx_dt_ids[] = {
	{ .compatible = "fsl,mc13783", .data = (void *) MC13XXX_ID_MC13783, },
	{ .compatible = "fsl,mc13892", .data = (void *) MC13XXX_ID_MC13892, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);

static int mc13xxx_probe(struct spi_device *spi)
{
	const struct of_device_id *of_id;
	struct spi_driver *sdrv = to_spi_driver(spi->dev.driver);
	struct mc13xxx *mc13xxx;
	struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev);
	enum mc13xxx_id id;
	int ret;

	of_id = of_match_device(mc13xxx_dt_ids, &spi->dev);
	if (of_id)
		sdrv->id_table = &mc13xxx_device_id[(enum mc13xxx_id) of_id->data];

	mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
	if (!mc13xxx)
		return -ENOMEM;

	dev_set_drvdata(&spi->dev, mc13xxx);
	spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
	spi->bits_per_word = 32;
	spi_setup(spi);

	mc13xxx->spidev = spi;

	mutex_init(&mc13xxx->lock);
	mc13xxx_lock(mc13xxx);

	ret = mc13xxx_identify(mc13xxx, &id);
	if (ret || id == MC13XXX_ID_INVALID)
		goto err_revision;

	/* mask all irqs */
	ret = mc13xxx_reg_write(mc13xxx, MC13XXX_IRQMASK0, 0x00ffffff);
	if (ret)
		goto err_mask;

	ret = mc13xxx_reg_write(mc13xxx, MC13XXX_IRQMASK1, 0x00ffffff);
	if (ret)
		goto err_mask;

	ret = request_threaded_irq(spi->irq, NULL, mc13xxx_irq_thread,
			IRQF_ONESHOT | IRQF_TRIGGER_HIGH, "mc13xxx", mc13xxx);

	if (ret) {
err_mask:
err_revision:
		mc13xxx_unlock(mc13xxx);
		dev_set_drvdata(&spi->dev, NULL);
		kfree(mc13xxx);
		return ret;
	}

	mc13xxx_unlock(mc13xxx);

	if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
		mc13xxx->flags = pdata->flags;

	if (mc13xxx->flags & MC13XXX_USE_ADC)
		mc13xxx_add_subdevice(mc13xxx, "%s-adc");

	if (mc13xxx->flags & MC13XXX_USE_CODEC)
		mc13xxx_add_subdevice(mc13xxx, "%s-codec");

	if (mc13xxx->flags & MC13XXX_USE_RTC)
		mc13xxx_add_subdevice(mc13xxx, "%s-rtc");

	if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
				&pdata->touch, sizeof(pdata->touch));

	if (pdata) {
		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
			&pdata->regulators, sizeof(pdata->regulators));
		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
				pdata->leds, sizeof(*pdata->leds));
		mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
				pdata->buttons, sizeof(*pdata->buttons));
	} else {
		mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
		mc13xxx_add_subdevice(mc13xxx, "%s-led");
		mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
	}

	return 0;
}

static int __devexit mc13xxx_remove(struct spi_device *spi)
{
	struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev);

	free_irq(mc13xxx->spidev->irq, mc13xxx);

	mfd_remove_devices(&spi->dev);

	kfree(mc13xxx);

	return 0;
}

static struct spi_driver mc13xxx_driver = {
	.id_table = mc13xxx_device_id,
	.driver = {
		.name = "mc13xxx",
		.owner = THIS_MODULE,
		.of_match_table = mc13xxx_dt_ids,
	},
	.probe = mc13xxx_probe,
	.remove = __devexit_p(mc13xxx_remove),
};

static int __init mc13xxx_init(void)
{
	return spi_register_driver(&mc13xxx_driver);
}
subsys_initcall(mc13xxx_init);

static void __exit mc13xxx_exit(void)
{
	spi_unregister_driver(&mc13xxx_driver);
}
module_exit(mc13xxx_exit);

MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
MODULE_LICENSE("GPL v2");