aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/common/locomo.c
blob: 62f241b09fe33008581d98d148363b9b870b6810 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/arch/arm/common/locomo.c
 *
 * Sharp LoCoMo support
 *
 * This file contains all generic LoCoMo support.
 *
 * All initialization functions provided here are intended to be called
 * from machine specific code with proper arguments when required.
 *
 * Based on sa1111.c
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>

#include <asm/hardware/locomo.h>

/* LoCoMo Interrupts */
#define IRQ_LOCOMO_KEY		(0)
#define IRQ_LOCOMO_GPIO		(1)
#define IRQ_LOCOMO_LT		(2)
#define IRQ_LOCOMO_SPI		(3)

/* M62332 output channel selection */
#define M62332_EVR_CH	1	/* M62332 volume channel number  */
				/*   0 : CH.1 , 1 : CH. 2        */
/* DAC send data */
#define	M62332_SLAVE_ADDR	0x4e	/* Slave address  */
#define	M62332_W_BIT		0x00	/* W bit (0 only) */
#define	M62332_SUB_ADDR		0x00	/* Sub address    */
#define	M62332_A_BIT		0x00	/* A bit (0 only) */

/* DAC setup and hold times (expressed in us) */
#define DAC_BUS_FREE_TIME	5	/*   4.7 us */
#define DAC_START_SETUP_TIME	5	/*   4.7 us */
#define DAC_STOP_SETUP_TIME	4	/*   4.0 us */
#define DAC_START_HOLD_TIME	5	/*   4.7 us */
#define DAC_SCL_LOW_HOLD_TIME	5	/*   4.7 us */
#define DAC_SCL_HIGH_HOLD_TIME	4	/*   4.0 us */
#define DAC_DATA_SETUP_TIME	1	/*   250 ns */
#define DAC_DATA_HOLD_TIME	1	/*   300 ns */
#define DAC_LOW_SETUP_TIME	1	/*   300 ns */
#define DAC_HIGH_SETUP_TIME	1	/*  1000 ns */

/* the following is the overall data for the locomo chip */
struct locomo {
	struct device *dev;
	unsigned long phys;
	unsigned int irq;
	int irq_base;
	spinlock_t lock;
	void __iomem *base;
#ifdef CONFIG_PM
	void *saved_state;
#endif
};

struct locomo_dev_info {
	unsigned long	offset;
	unsigned long	length;
	unsigned int	devid;
	unsigned int	irq[1];
	const char *	name;
};

/* All the locomo devices.  If offset is non-zero, the mapbase for the
 * locomo_dev will be set to the chip base plus offset.  If offset is
 * zero, then the mapbase for the locomo_dev will be set to zero.  An
 * offset of zero means the device only uses GPIOs or other helper
 * functions inside this file */
static struct locomo_dev_info locomo_devices[] = {
	{
		.devid 		= LOCOMO_DEVID_KEYBOARD,
		.irq		= { IRQ_LOCOMO_KEY },
		.name		= "locomo-keyboard",
		.offset		= LOCOMO_KEYBOARD,
		.length		= 16,
	},
	{
		.devid		= LOCOMO_DEVID_FRONTLIGHT,
		.irq		= {},
		.name		= "locomo-frontlight",
		.offset		= LOCOMO_FRONTLIGHT,
		.length		= 8,

	},
	{
		.devid		= LOCOMO_DEVID_BACKLIGHT,
		.irq		= {},
		.name		= "locomo-backlight",
		.offset		= LOCOMO_BACKLIGHT,
		.length		= 8,
	},
	{
		.devid		= LOCOMO_DEVID_AUDIO,
		.irq		= {},
		.name		= "locomo-audio",
		.offset		= LOCOMO_AUDIO,
		.length		= 4,
	},
	{
		.devid		= LOCOMO_DEVID_LED,
		.irq 		= {},
		.name		= "locomo-led",
		.offset		= LOCOMO_LED,
		.length		= 8,
	},
	{
		.devid		= LOCOMO_DEVID_UART,
		.irq		= {},
		.name		= "locomo-uart",
		.offset		= 0,
		.length		= 0,
	},
	{
		.devid		= LOCOMO_DEVID_SPI,
		.irq		= {},
		.name		= "locomo-spi",
		.offset		= LOCOMO_SPI,
		.length		= 0x30,
	},
};

static void locomo_handler(struct irq_desc *desc)
{
	struct locomo *lchip = irq_desc_get_handler_data(desc);
	int req, i;

	/* Acknowledge the parent IRQ */
	desc->irq_data.chip->irq_ack(&desc->irq_data);

	/* check why this interrupt was generated */
	req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;

	if (req) {
		unsigned int irq;

		/* generate the next interrupt(s) */
		irq = lchip->irq_base;
		for (i = 0; i <= 3; i++, irq++) {
			if (req & (0x0100 << i)) {
				generic_handle_irq(irq);
			}

		}
	}
}

static void locomo_ack_irq(struct irq_data *d)
{
}

static void locomo_mask_irq(struct irq_data *d)
{
	struct locomo *lchip = irq_data_get_irq_chip_data(d);
	unsigned int r;
	r = locomo_readl(lchip->base + LOCOMO_ICR);
	r &= ~(0x0010 << (d->irq - lchip->irq_base));
	locomo_writel(r, lchip->base + LOCOMO_ICR);
}

static void locomo_unmask_irq(struct irq_data *d)
{
	struct locomo *lchip = irq_data_get_irq_chip_data(d);
	unsigned int r;
	r = locomo_readl(lchip->base + LOCOMO_ICR);
	r |= (0x0010 << (d->irq - lchip->irq_base));
	locomo_writel(r, lchip->base + LOCOMO_ICR);
}

static struct irq_chip locomo_chip = {
	.name		= "LOCOMO",
	.irq_ack	= locomo_ack_irq,
	.irq_mask	= locomo_mask_irq,
	.irq_unmask	= locomo_unmask_irq,
};

static void locomo_setup_irq(struct locomo *lchip)
{
	int irq = lchip->irq_base;

	/*
	 * Install handler for IRQ_LOCOMO_HW.
	 */
	irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
	irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);

	/* Install handlers for IRQ_LOCOMO_* */
	for ( ; irq <= lchip->irq_base + 3; irq++) {
		irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
		irq_set_chip_data(irq, lchip);
		irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
	}
}


static void locomo_dev_release(struct device *_dev)
{
	struct locomo_dev *dev = LOCOMO_DEV(_dev);

	kfree(dev);
}

static int
locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
{
	struct locomo_dev *dev;
	int ret;

	dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
	if (!dev) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * If the parent device has a DMA mask associated with it,
	 * propagate it down to the children.
	 */
	if (lchip->dev->dma_mask) {
		dev->dma_mask = *lchip->dev->dma_mask;
		dev->dev.dma_mask = &dev->dma_mask;
	}

	dev_set_name(&dev->dev, "%s", info->name);
	dev->devid	 = info->devid;
	dev->dev.parent  = lchip->dev;
	dev->dev.bus     = &locomo_bus_type;
	dev->dev.release = locomo_dev_release;
	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;

	if (info->offset)
		dev->mapbase = lchip->base + info->offset;
	else
		dev->mapbase = 0;
	dev->length = info->length;

	dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
			NO_IRQ : lchip->irq_base + info->irq[0];

	ret = device_register(&dev->dev);
	if (ret) {
 out:
		kfree(dev);
	}
	return ret;
}

#ifdef CONFIG_PM

struct locomo_save_data {
	u16	LCM_GPO;
	u16	LCM_SPICT;
	u16	LCM_GPE;
	u16	LCM_ASD;
	u16	LCM_SPIMD;
};

static int locomo_suspend(struct platform_device *dev, pm_message_t state)
{
	struct locomo *lchip = platform_get_drvdata(dev);
	struct locomo_save_data *save;
	unsigned long flags;

	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
	if (!save)
		return -ENOMEM;

	lchip->saved_state = save;

	spin_lock_irqsave(&lchip->lock, flags);

	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);	/* SPI */
	locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);	/* SPI */
	locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);

	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);

	if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
	else
		/* 18MHz already enabled, so no wait */
		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */

	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */

	spin_unlock_irqrestore(&lchip->lock, flags);

	return 0;
}

static int locomo_resume(struct platform_device *dev)
{
	struct locomo *lchip = platform_get_drvdata(dev);
	struct locomo_save_data *save;
	unsigned long r;
	unsigned long flags;

	save = lchip->saved_state;
	if (!save)
		return 0;

	spin_lock_irqsave(&lchip->lock, flags);

	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);

	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
	locomo_writel(0x90, lchip->base + LOCOMO_TADC);

	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
	r &= 0xFEFF;
	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);

	spin_unlock_irqrestore(&lchip->lock, flags);

	lchip->saved_state = NULL;
	kfree(save);

	return 0;
}
#endif


/**
 *	locomo_probe - probe for a single LoCoMo chip.
 *	@phys_addr: physical address of device.
 *
 *	Probe for a LoCoMo chip.  This must be called
 *	before any other locomo-specific code.
 *
 *	Returns:
 *	%-ENODEV	device not found.
 *	%-EBUSY		physical address already marked in-use.
 *	%0		successful.
 */
static int
__locomo_probe(struct device *me, struct resource *mem, int irq)
{
	struct locomo_platform_data *pdata = me->platform_data;
	struct locomo *lchip;
	unsigned long r;
	int i, ret = -ENODEV;

	lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
	if (!lchip)
		return -ENOMEM;

	spin_lock_init(&lchip->lock);

	lchip->dev = me;
	dev_set_drvdata(lchip->dev, lchip);

	lchip->phys = mem->start;
	lchip->irq = irq;
	lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;

	/*
	 * Map the whole region.  This also maps the
	 * registers for our children.
	 */
	lchip->base = ioremap(mem->start, PAGE_SIZE);
	if (!lchip->base) {
		ret = -ENOMEM;
		goto out;
	}

	/* locomo initialize */
	locomo_writel(0, lchip->base + LOCOMO_ICR);
	/* KEYBOARD */
	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);

	/* GPIO */
	locomo_writel(0, lchip->base + LOCOMO_GPO);
	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
			, lchip->base + LOCOMO_GPE);
	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
			, lchip->base + LOCOMO_GPD);
	locomo_writel(0, lchip->base + LOCOMO_GIE);

	/* Frontlight */
	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);

	/* Longtime timer */
	locomo_writel(0, lchip->base + LOCOMO_LTINT);
	/* SPI */
	locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);

	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
	r = locomo_readl(lchip->base + LOCOMO_ASD);
	r |= 0x8000;
	locomo_writel(r, lchip->base + LOCOMO_ASD);

	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
	r = locomo_readl(lchip->base + LOCOMO_HSD);
	r |= 0x8000;
	locomo_writel(r, lchip->base + LOCOMO_HSD);

	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);

	/* XON */
	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
	udelay(1000);
	/* CLK9MEN */
	r = locomo_readl(lchip->base + LOCOMO_TADC);
	r |= 0x10;
	locomo_writel(r, lchip->base + LOCOMO_TADC);
	udelay(100);

	/* init DAC */
	r = locomo_readl(lchip->base + LOCOMO_DAC);
	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, lchip->base + LOCOMO_DAC);

	r = locomo_readl(lchip->base + LOCOMO_VER);
	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));

	/*
	 * The interrupt controller must be initialised before any
	 * other device to ensure that the interrupts are available.
	 */
	if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
		locomo_setup_irq(lchip);

	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
		locomo_init_one_child(lchip, &locomo_devices[i]);
	return 0;

 out:
	kfree(lchip);
	return ret;
}

static int locomo_remove_child(struct device *dev, void *data)
{
	device_unregister(dev);
	return 0;
} 

static void __locomo_remove(struct locomo *lchip)
{
	device_for_each_child(lchip->dev, NULL, locomo_remove_child);

	if (lchip->irq != NO_IRQ) {
		irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
	}

	iounmap(lchip->base);
	kfree(lchip);
}

static int locomo_probe(struct platform_device *dev)
{
	struct resource *mem;
	int irq;

	mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!mem)
		return -EINVAL;
	irq = platform_get_irq(dev, 0);
	if (irq < 0)
		return -ENXIO;

	return __locomo_probe(&dev->dev, mem, irq);
}

static int locomo_remove(struct platform_device *dev)
{
	struct locomo *lchip = platform_get_drvdata(dev);

	if (lchip) {
		__locomo_remove(lchip);
		platform_set_drvdata(dev, NULL);
	}

	return 0;
}

/*
 *	Not sure if this should be on the system bus or not yet.
 *	We really want some way to register a system device at
 *	the per-machine level, and then have this driver pick
 *	up the registered devices.
 */
static struct platform_driver locomo_device_driver = {
	.probe		= locomo_probe,
	.remove		= locomo_remove,
#ifdef CONFIG_PM
	.suspend	= locomo_suspend,
	.resume		= locomo_resume,
#endif
	.driver		= {
		.name	= "locomo",
	},
};

/*
 *	Get the parent device driver (us) structure
 *	from a child function device
 */
static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
{
	return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
}

void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int r;

	if (!lchip)
		return;

	spin_lock_irqsave(&lchip->lock, flags);

	r = locomo_readl(lchip->base + LOCOMO_GPD);
	if (dir)
		r |= bits;
	else
		r &= ~bits;
	locomo_writel(r, lchip->base + LOCOMO_GPD);

	r = locomo_readl(lchip->base + LOCOMO_GPE);
	if (dir)
		r |= bits;
	else
		r &= ~bits;
	locomo_writel(r, lchip->base + LOCOMO_GPE);

	spin_unlock_irqrestore(&lchip->lock, flags);
}
EXPORT_SYMBOL(locomo_gpio_set_dir);

int locomo_gpio_read_level(struct device *dev, unsigned int bits)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int ret;

	if (!lchip)
		return -ENODEV;

	spin_lock_irqsave(&lchip->lock, flags);
	ret = locomo_readl(lchip->base + LOCOMO_GPL);
	spin_unlock_irqrestore(&lchip->lock, flags);

	ret &= bits;
	return ret;
}
EXPORT_SYMBOL(locomo_gpio_read_level);

int locomo_gpio_read_output(struct device *dev, unsigned int bits)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int ret;

	if (!lchip)
		return -ENODEV;

	spin_lock_irqsave(&lchip->lock, flags);
	ret = locomo_readl(lchip->base + LOCOMO_GPO);
	spin_unlock_irqrestore(&lchip->lock, flags);

	ret &= bits;
	return ret;
}
EXPORT_SYMBOL(locomo_gpio_read_output);

void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
{
	struct locomo *lchip = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned int r;

	if (!lchip)
		return;

	spin_lock_irqsave(&lchip->lock, flags);

	r = locomo_readl(lchip->base + LOCOMO_GPO);
	if (set)
		r |= bits;
	else
		r &= ~bits;
	locomo_writel(r, lchip->base + LOCOMO_GPO);

	spin_unlock_irqrestore(&lchip->lock, flags);
}
EXPORT_SYMBOL(locomo_gpio_write);

static void locomo_m62332_sendbit(void *mapbase, int bit)
{
	unsigned int r;

	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */

	if (bit & 1) {
		r = locomo_readl(mapbase + LOCOMO_DAC);
		r |=  LOCOMO_DAC_SDAOEB;
		locomo_writel(r, mapbase + LOCOMO_DAC);
		udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	} else {
		r = locomo_readl(mapbase + LOCOMO_DAC);
		r &=  ~(LOCOMO_DAC_SDAOEB);
		locomo_writel(r, mapbase + LOCOMO_DAC);
		udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	}

	udelay(DAC_DATA_SETUP_TIME);	/* 250 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/*  4.0 usec */
}

void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
{
	struct locomo *lchip = locomo_chip_driver(ldev);
	int i;
	unsigned char data;
	unsigned int r;
	void *mapbase = lchip->base;
	unsigned long flags;

	spin_lock_irqsave(&lchip->lock, flags);

	/* Start */
	udelay(DAC_BUS_FREE_TIME);	/* 5.0 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.0 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_START_HOLD_TIME);	/* 5.0 usec */
	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */

	/* Send slave address and W bit (LSB is W bit) */
	data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
		goto out;
	}

	/* Send Sub address (LSB is channel select) */
	/*    channel = 0 : ch1 select              */
	/*            = 1 : ch2 select              */
	data = M62332_SUB_ADDR + channel;
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
		goto out;
	}

	/* Send DAC data */
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
	}

out:
	/* stop */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */

	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */

	spin_unlock_irqrestore(&lchip->lock, flags);
}
EXPORT_SYMBOL(locomo_m62332_senddata);

/*
 *	Frontlight control
 */

void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
{
	unsigned long flags;
	struct locomo *lchip = locomo_chip_driver(dev);

	if (vr)
		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
	else
		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);

	spin_lock_irqsave(&lchip->lock, flags);
	locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
	udelay(100);
	locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
	locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
	spin_unlock_irqrestore(&lchip->lock, flags);
}
EXPORT_SYMBOL(locomo_frontlight_set);

/*
 *	LoCoMo "Register Access Bus."
 *
 *	We model this as a regular bus type, and hang devices directly
 *	off this.
 */
static int locomo_match(struct device *_dev, struct device_driver *_drv)
{
	struct locomo_dev *dev = LOCOMO_DEV(_dev);
	struct locomo_driver *drv = LOCOMO_DRV(_drv);

	return dev->devid == drv->devid;
}

static int locomo_bus_probe(struct device *dev)
{
	struct locomo_dev *ldev = LOCOMO_DEV(dev);
	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
	int ret = -ENODEV;

	if (drv->probe)
		ret = drv->probe(ldev);
	return ret;
}

static int locomo_bus_remove(struct device *dev)
{
	struct locomo_dev *ldev = LOCOMO_DEV(dev);
	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
	int ret = 0;

	if (drv->remove)
		ret = drv->remove(ldev);
	return ret;
}

struct bus_type locomo_bus_type = {
	.name		= "locomo-bus",
	.match		= locomo_match,
	.probe		= locomo_bus_probe,
	.remove		= locomo_bus_remove,
};

int locomo_driver_register(struct locomo_driver *driver)
{
	driver->drv.bus = &locomo_bus_type;
	return driver_register(&driver->drv);
}
EXPORT_SYMBOL(locomo_driver_register);

void locomo_driver_unregister(struct locomo_driver *driver)
{
	driver_unregister(&driver->drv);
}
EXPORT_SYMBOL(locomo_driver_unregister);

static int __init locomo_init(void)
{
	int ret = bus_register(&locomo_bus_type);
	if (ret == 0)
		platform_driver_register(&locomo_device_driver);
	return ret;
}

static void __exit locomo_exit(void)
{
	platform_driver_unregister(&locomo_device_driver);
	bus_unregister(&locomo_bus_type);
}

module_init(locomo_init);
module_exit(locomo_exit);

MODULE_DESCRIPTION("Sharp LoCoMo core driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");