summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/ab3100-core.c
blob: 613481028272f114c754a4a652987fce90452cae (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
/*
 * Copyright (C) 2007-2009 ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 * Low-level core for exclusive access to the AB3100 IC on the I2C bus
 * and some basic chip-configuration.
 * Author: Linus Walleij <linus.walleij@stericsson.com>
 */

#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/mfd/ab3100.h>

/* These are the only registers inside AB3100 used in this main file */

/* Interrupt event registers */
#define AB3100_EVENTA1		0x21
#define AB3100_EVENTA2		0x22
#define AB3100_EVENTA3		0x23

/* AB3100 DAC converter registers */
#define AB3100_DIS		0x00
#define AB3100_D0C		0x01
#define AB3100_D1C		0x02
#define AB3100_D2C		0x03
#define AB3100_D3C		0x04

/* Chip ID register */
#define AB3100_CID		0x20

/* AB3100 interrupt registers */
#define AB3100_IMRA1		0x24
#define AB3100_IMRA2		0x25
#define AB3100_IMRA3		0x26
#define AB3100_IMRB1		0x2B
#define AB3100_IMRB2		0x2C
#define AB3100_IMRB3		0x2D

/* System Power Monitoring and control registers */
#define AB3100_MCA		0x2E
#define AB3100_MCB		0x2F

/* SIM power up */
#define AB3100_SUP		0x50

/*
 * I2C communication
 *
 * The AB3100 is usually assigned address 0x48 (7-bit)
 * The chip is defined in the platform i2c_board_data section.
 */

u8 ab3100_get_chip_type(struct ab3100 *ab3100)
{
	u8 chip = ABUNKNOWN;

	switch (ab3100->chip_id & 0xf0) {
	case  0xa0:
		chip = AB3000;
		break;
	case  0xc0:
		chip = AB3100;
		break;
	}
	return chip;
}
EXPORT_SYMBOL(ab3100_get_chip_type);

int ab3100_set_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 regval)
{
	u8 regandval[2] = {reg, regval};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
		return err;

	/*
	 * A two-byte write message with the first byte containing the register
	 * number and the second byte containing the value to be written
	 * effectively sets a register in the AB3100.
	 */
	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (write register): %d\n",
			err);
	} else if (err != 2) {
		dev_err(ab3100->dev,
			"write error (write register) "
			"%d bytes transferred (expected 2)\n",
			err);
		err = -EIO;
	} else {
		/* All is well */
		err = 0;
	}
	mutex_unlock(&ab3100->access_mutex);
	return err;
}
EXPORT_SYMBOL(ab3100_set_register_interruptible);


/*
 * The test registers exist at an I2C bus address up one
 * from the ordinary base. They are not supposed to be used
 * in production code, but sometimes you have to do that
 * anyway. It's currently only used from this file so declare
 * it static and do not export.
 */
static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
				    u8 reg, u8 regval)
{
	u8 regandval[2] = {reg, regval};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
		return err;

	err = i2c_master_send(ab3100->testreg_client, regandval, 2);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (write test register): %d\n",
			err);
	} else if (err != 2) {
		dev_err(ab3100->dev,
			"write error (write test register) "
			"%d bytes transferred (expected 2)\n",
			err);
		err = -EIO;
	} else {
		/* All is well */
		err = 0;
	}
	mutex_unlock(&ab3100->access_mutex);

	return err;
}


int ab3100_get_register_interruptible(struct ab3100 *ab3100, u8 reg, u8 *regval)
{
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
		return err;

	/*
	 * AB3100 require an I2C "stop" command between each message, else
	 * it will not work. The only way of achieveing this with the
	 * message transport layer is to send the read and write messages
	 * separately.
	 */
	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (send register address): %d\n",
			err);
		goto get_reg_out_unlock;
	} else if (err != 1) {
		dev_err(ab3100->dev,
			"write error (send register address) "
			"%d bytes transferred (expected 1)\n",
			err);
		err = -EIO;
		goto get_reg_out_unlock;
	} else {
		/* All is well */
		err = 0;
	}

	err = i2c_master_recv(ab3100->i2c_client, regval, 1);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (read register): %d\n",
			err);
		goto get_reg_out_unlock;
	} else if (err != 1) {
		dev_err(ab3100->dev,
			"write error (read register) "
			"%d bytes transferred (expected 1)\n",
			err);
		err = -EIO;
		goto get_reg_out_unlock;
	} else {
		/* All is well */
		err = 0;
	}

 get_reg_out_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
}
EXPORT_SYMBOL(ab3100_get_register_interruptible);


int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
			     u8 first_reg, u8 *regvals, u8 numregs)
{
	int err;

	if (ab3100->chip_id == 0xa0 ||
	    ab3100->chip_id == 0xa1)
		/* These don't support paged reads */
		return -EIO;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
		return err;

	/*
	 * Paged read also require an I2C "stop" command.
	 */
	err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (send first register address): %d\n",
			err);
		goto get_reg_page_out_unlock;
	} else if (err != 1) {
		dev_err(ab3100->dev,
			"write error (send first register address) "
			"%d bytes transferred (expected 1)\n",
			err);
		err = -EIO;
		goto get_reg_page_out_unlock;
	}

	err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (read register page): %d\n",
			err);
		goto get_reg_page_out_unlock;
	} else if (err != numregs) {
		dev_err(ab3100->dev,
			"write error (read register page) "
			"%d bytes transferred (expected %d)\n",
			err, numregs);
		err = -EIO;
		goto get_reg_page_out_unlock;
	}

	/* All is well */
	err = 0;

 get_reg_page_out_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
}
EXPORT_SYMBOL(ab3100_get_register_page_interruptible);


int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
				 u8 reg, u8 andmask, u8 ormask)
{
	u8 regandval[2] = {reg, 0};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
		return err;

	/* First read out the target register */
	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (maskset send address): %d\n",
			err);
		goto get_maskset_unlock;
	} else if (err != 1) {
		dev_err(ab3100->dev,
			"write error (maskset send address) "
			"%d bytes transferred (expected 1)\n",
			err);
		err = -EIO;
		goto get_maskset_unlock;
	}

	err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (maskset read register): %d\n",
			err);
		goto get_maskset_unlock;
	} else if (err != 1) {
		dev_err(ab3100->dev,
			"write error (maskset read register) "
			"%d bytes transferred (expected 1)\n",
			err);
		err = -EIO;
		goto get_maskset_unlock;
	}

	/* Modify the register */
	regandval[1] &= andmask;
	regandval[1] |= ormask;

	/* Write the register */
	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
	if (err < 0) {
		dev_err(ab3100->dev,
			"write error (write register): %d\n",
			err);
		goto get_maskset_unlock;
	} else if (err != 2) {
		dev_err(ab3100->dev,
			"write error (write register) "
			"%d bytes transferred (expected 2)\n",
			err);
		err = -EIO;
		goto get_maskset_unlock;
	}

	/* All is well */
	err = 0;

 get_maskset_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
}
EXPORT_SYMBOL(ab3100_mask_and_set_register_interruptible);


/*
 * Register a simple callback for handling any AB3100 events.
 */
int ab3100_event_register(struct ab3100 *ab3100,
			  struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&ab3100->event_subscribers,
					       nb);
}
EXPORT_SYMBOL(ab3100_event_register);

/*
 * Remove a previously registered callback.
 */
int ab3100_event_unregister(struct ab3100 *ab3100,
			    struct notifier_block *nb)
{
  return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
					    nb);
}
EXPORT_SYMBOL(ab3100_event_unregister);


int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
					     u32 *fatevent)
{
	if (!ab3100->startup_events_read)
		return -EAGAIN; /* Try again later */
	*fatevent = ab3100->startup_events;
	return 0;
}
EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);

/* Interrupt handling worker */
static void ab3100_work(struct work_struct *work)
{
	struct ab3100 *ab3100 = container_of(work, struct ab3100, work);
	u8 event_regs[3];
	u32 fatevent;
	int err;

	err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
				       event_regs, 3);
	if (err)
		goto err_event_wq;

	fatevent = (event_regs[0] << 16) |
		(event_regs[1] << 8) |
		event_regs[2];

	if (!ab3100->startup_events_read) {
		ab3100->startup_events = fatevent;
		ab3100->startup_events_read = true;
	}
	/*
	 * The notified parties will have to mask out the events
	 * they're interested in and react to them. They will be
	 * notified on all events, then they use the fatevent value
	 * to determine if they're interested.
	 */
	blocking_notifier_call_chain(&ab3100->event_subscribers,
				     fatevent, NULL);

	dev_dbg(ab3100->dev,
		"IRQ Event: 0x%08x\n", fatevent);

	/* By now the IRQ should be acked and deasserted so enable it again */
	enable_irq(ab3100->i2c_client->irq);
	return;

 err_event_wq:
	dev_dbg(ab3100->dev,
		"error in event workqueue\n");
	/* Enable the IRQ anyway, what choice do we have? */
	enable_irq(ab3100->i2c_client->irq);
	return;
}

static irqreturn_t ab3100_irq_handler(int irq, void *data)
{
	struct ab3100 *ab3100 = data;
	/*
	 * Disable the IRQ and dispatch a worker to handle the
	 * event. Since the chip resides on I2C this is slow
	 * stuff and we will re-enable the interrupts once th
	 * worker has finished.
	 */
	disable_irq_nosync(irq);
	schedule_work(&ab3100->work);
	return IRQ_HANDLED;
}

#ifdef CONFIG_DEBUG_FS
/*
 * Some debugfs entries only exposed if we're using debug
 */
static int ab3100_registers_print(struct seq_file *s, void *p)
{
	struct ab3100 *ab3100 = s->private;
	u8 value;
	u8 reg;

	seq_printf(s, "AB3100 registers:\n");

	for (reg = 0; reg < 0xff; reg++) {
		ab3100_get_register_interruptible(ab3100, reg, &value);
		seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
	}
	return 0;
}

static int ab3100_registers_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3100_registers_print, inode->i_private);
}

static const struct file_operations ab3100_registers_fops = {
	.open = ab3100_registers_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

struct ab3100_get_set_reg_priv {
	struct ab3100 *ab3100;
	bool mode;
};

static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t ab3100_get_set_reg(struct file *file,
				  const char __user *user_buf,
				  size_t count, loff_t *ppos)
{
	struct ab3100_get_set_reg_priv *priv = file->private_data;
	struct ab3100 *ab3100 = priv->ab3100;
	char buf[32];
	ssize_t buf_size;
	int regp;
	unsigned long user_reg;
	int err;
	int i = 0;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	/*
	 * The idea is here to parse a string which is either
	 * "0xnn" for reading a register, or "0xaa 0xbb" for
	 * writing 0xbb to the register 0xaa. First move past
	 * whitespace and then begin to parse the register.
	 */
	while ((i < buf_size) && (buf[i] == ' '))
		i++;
	regp = i;

	/*
	 * Advance pointer to end of string then terminate
	 * the register string. This is needed to satisfy
	 * the strict_strtoul() function.
	 */
	while ((i < buf_size) && (buf[i] != ' '))
		i++;
	buf[i] = '\0';

	err = strict_strtoul(&buf[regp], 16, &user_reg);
	if (err)
		return err;
	if (user_reg > 0xff)
		return -EINVAL;

	/* Either we read or we write a register here */
	if (!priv->mode) {
		/* Reading */
		u8 reg = (u8) user_reg;
		u8 regvalue;

		ab3100_get_register_interruptible(ab3100, reg, &regvalue);

		dev_info(ab3100->dev,
			 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
			 reg, regvalue);
	} else {
		int valp;
		unsigned long user_value;
		u8 reg = (u8) user_reg;
		u8 value;
		u8 regvalue;

		/*
		 * Writing, we need some value to write to
		 * the register so keep parsing the string
		 * from userspace.
		 */
		i++;
		while ((i < buf_size) && (buf[i] == ' '))
			i++;
		valp = i;
		while ((i < buf_size) && (buf[i] != ' '))
			i++;
		buf[i] = '\0';

		err = strict_strtoul(&buf[valp], 16, &user_value);
		if (err)
			return err;
		if (user_reg > 0xff)
			return -EINVAL;

		value = (u8) user_value;
		ab3100_set_register_interruptible(ab3100, reg, value);
		ab3100_get_register_interruptible(ab3100, reg, &regvalue);

		dev_info(ab3100->dev,
			 "debug write reg[0x%02x] with 0x%02x, "
			 "after readback: 0x%02x\n",
			 reg, value, regvalue);
	}
	return buf_size;
}

static const struct file_operations ab3100_get_set_reg_fops = {
	.open = ab3100_get_set_reg_open_file,
	.write = ab3100_get_set_reg,
};

static struct dentry *ab3100_dir;
static struct dentry *ab3100_reg_file;
static struct ab3100_get_set_reg_priv ab3100_get_priv;
static struct dentry *ab3100_get_reg_file;
static struct ab3100_get_set_reg_priv ab3100_set_priv;
static struct dentry *ab3100_set_reg_file;

static void ab3100_setup_debugfs(struct ab3100 *ab3100)
{
	int err;

	ab3100_dir = debugfs_create_dir("ab3100", NULL);
	if (!ab3100_dir)
		goto exit_no_debugfs;

	ab3100_reg_file = debugfs_create_file("registers",
				S_IRUGO, ab3100_dir, ab3100,
				&ab3100_registers_fops);
	if (!ab3100_reg_file) {
		err = -ENOMEM;
		goto exit_destroy_dir;
	}

	ab3100_get_priv.ab3100 = ab3100;
	ab3100_get_priv.mode = false;
	ab3100_get_reg_file = debugfs_create_file("get_reg",
				S_IWUGO, ab3100_dir, &ab3100_get_priv,
				&ab3100_get_set_reg_fops);
	if (!ab3100_get_reg_file) {
		err = -ENOMEM;
		goto exit_destroy_reg;
	}

	ab3100_set_priv.ab3100 = ab3100;
	ab3100_set_priv.mode = true;
	ab3100_set_reg_file = debugfs_create_file("set_reg",
				S_IWUGO, ab3100_dir, &ab3100_set_priv,
				&ab3100_get_set_reg_fops);
	if (!ab3100_set_reg_file) {
		err = -ENOMEM;
		goto exit_destroy_get_reg;
	}
	return;

 exit_destroy_get_reg:
	debugfs_remove(ab3100_get_reg_file);
 exit_destroy_reg:
	debugfs_remove(ab3100_reg_file);
 exit_destroy_dir:
	debugfs_remove(ab3100_dir);
 exit_no_debugfs:
	return;
}
static inline void ab3100_remove_debugfs(void)
{
	debugfs_remove(ab3100_set_reg_file);
	debugfs_remove(ab3100_get_reg_file);
	debugfs_remove(ab3100_reg_file);
	debugfs_remove(ab3100_dir);
}
#else
static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
{
}
static inline void ab3100_remove_debugfs(void)
{
}
#endif

/*
 * Basic set-up, datastructure creation/destruction and I2C interface.
 * This sets up a default config in the AB3100 chip so that it
 * will work as expected.
 */

struct ab3100_init_setting {
	u8 abreg;
	u8 setting;
};

static const struct ab3100_init_setting __initconst
ab3100_init_settings[] = {
	{
		.abreg = AB3100_MCA,
		.setting = 0x01
	}, {
		.abreg = AB3100_MCB,
		.setting = 0x30
	}, {
		.abreg = AB3100_IMRA1,
		.setting = 0x00
	}, {
		.abreg = AB3100_IMRA2,
		.setting = 0xFF
	}, {
		.abreg = AB3100_IMRA3,
		.setting = 0x01
	}, {
		.abreg = AB3100_IMRB1,
		.setting = 0xBF
	}, {
		.abreg = AB3100_IMRB2,
		.setting = 0xFF
	}, {
		.abreg = AB3100_IMRB3,
		.setting = 0xFF
	}, {
		.abreg = AB3100_SUP,
		.setting = 0x00
	}, {
		.abreg = AB3100_DIS,
		.setting = 0xF0
	}, {
		.abreg = AB3100_D0C,
		.setting = 0x00
	}, {
		.abreg = AB3100_D1C,
		.setting = 0x00
	}, {
		.abreg = AB3100_D2C,
		.setting = 0x00
	}, {
		.abreg = AB3100_D3C,
		.setting = 0x00
	},
};

static int __init ab3100_setup(struct ab3100 *ab3100)
{
	int err = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
		err = ab3100_set_register_interruptible(ab3100,
					  ab3100_init_settings[i].abreg,
					  ab3100_init_settings[i].setting);
		if (err)
			goto exit_no_setup;
	}

	/*
	 * Special trick to make the AB3100 use the 32kHz clock (RTC)
	 * bit 3 in test register 0x02 is a special, undocumented test
	 * register bit that only exist in AB3100 P1E
	 */
	if (ab3100->chip_id == 0xc4) {
		dev_warn(ab3100->dev,
			 "AB3100 P1E variant detected, "
			 "forcing chip to 32KHz\n");
		err = ab3100_set_test_register_interruptible(ab3100, 0x02, 0x08);
	}

 exit_no_setup:
	return err;
}

/*
 * Here we define all the platform devices that appear
 * as children of the AB3100. These are regular platform
 * devices with the IORESOURCE_IO .start and .end set
 * to correspond to the internal AB3100 register range
 * mapping to the corresponding subdevice.
 */

#define AB3100_DEVICE(devname, devid)				\
static struct platform_device ab3100_##devname##_device = {	\
	.name		= devid,				\
	.id		= -1,					\
}

/*
 * This lists all the subdevices and corresponding register
 * ranges.
 */
AB3100_DEVICE(dac, "ab3100-dac");
AB3100_DEVICE(leds, "ab3100-leds");
AB3100_DEVICE(power, "ab3100-power");
AB3100_DEVICE(regulators, "ab3100-regulators");
AB3100_DEVICE(sim, "ab3100-sim");
AB3100_DEVICE(uart, "ab3100-uart");
AB3100_DEVICE(rtc, "ab3100-rtc");
AB3100_DEVICE(charger, "ab3100-charger");
AB3100_DEVICE(boost, "ab3100-boost");
AB3100_DEVICE(adc, "ab3100-adc");
AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
AB3100_DEVICE(vibrator, "ab3100-vibrator");
AB3100_DEVICE(otp, "ab3100-otp");
AB3100_DEVICE(codec, "ab3100-codec");

static struct platform_device *
ab3100_platform_devs[] = {
	&ab3100_dac_device,
	&ab3100_leds_device,
	&ab3100_power_device,
	&ab3100_regulators_device,
	&ab3100_sim_device,
	&ab3100_uart_device,
	&ab3100_rtc_device,
	&ab3100_charger_device,
	&ab3100_boost_device,
	&ab3100_adc_device,
	&ab3100_fuelgauge_device,
	&ab3100_vibrator_device,
	&ab3100_otp_device,
	&ab3100_codec_device,
};

struct ab_family_id {
	u8	id;
	char	*name;
};

static const struct ab_family_id ids[] __initdata = {
	/* AB3100 */
	{
		.id = 0xc0,
		.name = "P1A"
	}, {
		.id = 0xc1,
		.name = "P1B"
	}, {
		.id = 0xc2,
		.name = "P1C"
	}, {
		.id = 0xc3,
		.name = "P1D"
	}, {
		.id = 0xc4,
		.name = "P1E"
	}, {
		.id = 0xc5,
		.name = "P1F/R1A"
	}, {
		.id = 0xc6,
		.name = "P1G/R1A"
	}, {
		.id = 0xc7,
		.name = "P2A/R2A"
	}, {
		.id = 0xc8,
		.name = "P2B/R2B"
	},
	/* AB3000 variants, not supported */
	{
		.id = 0xa0
	}, {
		.id = 0xa1
	}, {
		.id = 0xa2
	}, {
		.id = 0xa3
	}, {
		.id = 0xa4
	}, {
		.id = 0xa5
	}, {
		.id = 0xa6
	}, {
		.id = 0xa7
	},
	/* Terminator */
	{
		.id = 0x00,
	},
};

static int __init ab3100_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct ab3100 *ab3100;
	struct ab3100_platform_data *ab3100_plf_data =
		client->dev.platform_data;
	int err;
	int i;

	ab3100 = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
	if (!ab3100) {
		dev_err(&client->dev, "could not allocate AB3100 device\n");
		return -ENOMEM;
	}

	/* Initialize data structure */
	mutex_init(&ab3100->access_mutex);
	BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);

	ab3100->i2c_client = client;
	ab3100->dev = &ab3100->i2c_client->dev;

	i2c_set_clientdata(client, ab3100);

	/* Read chip ID register */
	err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
						&ab3100->chip_id);
	if (err) {
		dev_err(&client->dev,
			"could not communicate with the AB3100 analog "
			"baseband chip\n");
		goto exit_no_detect;
	}

	for (i = 0; ids[i].id != 0x0; i++) {
		if (ids[i].id == ab3100->chip_id) {
			if (ids[i].name != NULL) {
				snprintf(&ab3100->chip_name[0],
					 sizeof(ab3100->chip_name) - 1,
					 "AB3100 %s",
					 ids[i].name);
				break;
			} else {
				dev_err(&client->dev,
					"AB3000 is not supported\n");
				goto exit_no_detect;
			}
		}
	}

	if (ids[i].id == 0x0) {
		dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
			ab3100->chip_id);
		dev_err(&client->dev, "accepting it anyway. Please update "
			"the driver.\n");
		goto exit_no_detect;
	}

	dev_info(&client->dev, "Detected chip: %s\n",
		 &ab3100->chip_name[0]);

	/* Attach a second dummy i2c_client to the test register address */
	ab3100->testreg_client = i2c_new_dummy(client->adapter,
						     client->addr + 1);
	if (!ab3100->testreg_client) {
		err = -ENOMEM;
		goto exit_no_testreg_client;
	}

	strlcpy(ab3100->testreg_client->name, id->name,
		sizeof(ab3100->testreg_client->name));

	err = ab3100_setup(ab3100);
	if (err)
		goto exit_no_setup;

	INIT_WORK(&ab3100->work, ab3100_work);

	/* This real unpredictable IRQ is of course sampled for entropy */
	err = request_irq(client->irq, ab3100_irq_handler,
			  IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
			  "AB3100 IRQ", ab3100);
	if (err)
		goto exit_no_irq;

	/* Set parent and a pointer back to the container in device data */
	for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
		ab3100_platform_devs[i]->dev.parent =
			&client->dev;
		ab3100_platform_devs[i]->dev.platform_data =
			ab3100_plf_data;
		platform_set_drvdata(ab3100_platform_devs[i], ab3100);
	}

	/* Register the platform devices */
	platform_add_devices(ab3100_platform_devs,
			     ARRAY_SIZE(ab3100_platform_devs));

	ab3100_setup_debugfs(ab3100);

	return 0;

 exit_no_irq:
 exit_no_setup:
	i2c_unregister_device(ab3100->testreg_client);
 exit_no_testreg_client:
 exit_no_detect:
	kfree(ab3100);
	return err;
}

static int __exit ab3100_remove(struct i2c_client *client)
{
	struct ab3100 *ab3100 = i2c_get_clientdata(client);
	int i;

	/* Unregister subdevices */
	for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
		platform_device_unregister(ab3100_platform_devs[i]);

	ab3100_remove_debugfs();
	i2c_unregister_device(ab3100->testreg_client);

	/*
	 * At this point, all subscribers should have unregistered
	 * their notifiers so deactivate IRQ
	 */
	free_irq(client->irq, ab3100);
	kfree(ab3100);
	return 0;
}

static const struct i2c_device_id ab3100_id[] = {
	{ "ab3100", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ab3100_id);

static struct i2c_driver ab3100_driver = {
	.driver = {
		.name	= "ab3100",
		.owner	= THIS_MODULE,
	},
	.id_table	= ab3100_id,
	.probe		= ab3100_probe,
	.remove		= __exit_p(ab3100_remove),
};

static int __init ab3100_i2c_init(void)
{
	return i2c_add_driver(&ab3100_driver);
}

static void __exit ab3100_i2c_exit(void)
{
	i2c_del_driver(&ab3100_driver);
}

subsys_initcall(ab3100_i2c_init);
module_exit(ab3100_i2c_exit);

MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
MODULE_DESCRIPTION("AB3100 core driver");
MODULE_LICENSE("GPL");