summaryrefslogtreecommitdiff
path: root/recipes/linux/logicpd-pxa270-2.6.19.2/ucb1400-touchscreen.patch
blob: 3986a2c10aea78138b4edc29535430289a0ee22c (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
This patch is slightly adjusted from

http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=3073/1
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=3074/2
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=3075/2

in order to get it to apply cleanly to the released 2.6.15 codebase
and to put the Kconfig stuff in a more reasonable place in the tree.
Actually, I think Kconfig should probably separate the notion of the
touchscreen driver and the AC97-MCP layer thing; but that problem is
basically in the underlying mcp-based ucb1x00 driver layout in the
first place.
Index: linux-2.6.15gum/drivers/mfd/Makefile
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/Makefile
+++ linux-2.6.15gum/drivers/mfd/Makefile
@@ -10,3 +10,6 @@
 ifeq ($(CONFIG_SA1100_ASSABET),y)
 obj-$(CONFIG_MCP_UCB1200)      += ucb1x00-assabet.o
 endif
+
+obj-$(CONFIG_TOUCHSCREEN_UCB1400)      += mcp-ac97.o ucb1x00-core.o ucb1x00-ts.o
+
Index: linux-2.6.15gum/drivers/mfd/mcp-core.c
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/mcp-core.c
+++ linux-2.6.15gum/drivers/mfd/mcp-core.c
@@ -18,7 +18,6 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 
-#include <asm/dma.h>
 #include <asm/system.h>
 
 #include "mcp.h"
@@ -206,6 +205,7 @@ struct mcp *mcp_host_alloc(struct device
 		mcp->attached_device.bus = &mcp_bus_type;
 		mcp->attached_device.dma_mask = parent->dma_mask;
 		mcp->attached_device.release = mcp_release;
+		mcp->dev = &mcp->attached_device;
 	}
 	return mcp;
 }
Index: linux-2.6.15gum/drivers/mfd/mcp-sa11x0.c
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/mcp-sa11x0.c
+++ linux-2.6.15gum/drivers/mfd/mcp-sa11x0.c
@@ -31,8 +31,12 @@
 #include "mcp.h"
 
 struct mcp_sa11x0 {
-	u32	mccr0;
-	u32	mccr1;
+	u32		mccr0;
+	u32		mccr1;
+	dma_device_t	dma_audio_rd;
+	dma_device_t	dma_audio_wr;
+	dma_device_t	dma_telco_rd;
+	dma_device_t	dma_telco_wr;
 };
 
 #define priv(mcp)	((struct mcp_sa11x0 *)mcp_priv(mcp))
@@ -159,10 +163,10 @@ static int mcp_sa11x0_probe(struct platf
 	mcp->owner		= THIS_MODULE;
 	mcp->ops		= &mcp_sa11x0;
 	mcp->sclk_rate		= data->sclk_rate;
-	mcp->dma_audio_rd	= DMA_Ser4MCP0Rd;
-	mcp->dma_audio_wr	= DMA_Ser4MCP0Wr;
-	mcp->dma_telco_rd	= DMA_Ser4MCP1Rd;
-	mcp->dma_telco_wr	= DMA_Ser4MCP1Wr;
+	priv(mcp)->dma_audio_rd	= DMA_Ser4MCP0Rd;
+	priv(mcp)->dma_audio_wr	= DMA_Ser4MCP0Wr;
+	priv(mcp)->dma_telco_rd	= DMA_Ser4MCP1Rd;
+	priv(mcp)->dma_telco_wr	= DMA_Ser4MCP1Wr;
 
 	platform_set_drvdata(pdev, mcp);
 
Index: linux-2.6.15gum/drivers/mfd/mcp.h
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/mcp.h
+++ linux-2.6.15gum/drivers/mfd/mcp.h
@@ -19,11 +19,8 @@ struct mcp {
 	int		use_count;
 	unsigned int	sclk_rate;
 	unsigned int	rw_timeout;
-	dma_device_t	dma_audio_rd;
-	dma_device_t	dma_audio_wr;
-	dma_device_t	dma_telco_rd;
-	dma_device_t	dma_telco_wr;
 	struct device	attached_device;
+	struct device	*dev;
 };
 
 struct mcp_ops {
Index: linux-2.6.15gum/drivers/mfd/ucb1x00-assabet.c
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/ucb1x00-assabet.c
+++ linux-2.6.15gum/drivers/mfd/ucb1x00-assabet.c
@@ -15,8 +15,6 @@
 #include <linux/proc_fs.h>
 #include <linux/device.h>
 
-#include <asm/dma.h>
-
 #include "ucb1x00.h"
 
 #define UCB1X00_ATTR(name,input)\
Index: linux-2.6.15gum/drivers/mfd/ucb1x00-core.c
===================================================================
--- a/drivers/mfd/ucb1x00-core~org.c	2006-11-29 16:57:37.000000000 -0500
+++ a/drivers/mfd/ucb1x00-core.c	2006-12-29 13:42:58.000000000 -0500
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
+#include <linux/kthread.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
 
@@ -30,6 +31,14 @@
 
 #include "ucb1x00.h"
 
+#if (defined CONFIG_UCB1400) || (defined CONFIG_UCB1400_MODULE)
+#define UCB_IS_1400(id)  ((id) == UCB_ID_1400)
+#define UCB_X_CSR1        0xe		/* this fake entry will be translated by mcp */
+#define UCB_X_CSR2        0xf		/* this fake entry will be translated by mcp */
+#else
+#define UCB_IS_1400(id)  (0)
+#endif
+
 static DEFINE_MUTEX(ucb1x00_mutex);
 static LIST_HEAD(ucb1x00_drivers);
 static LIST_HEAD(ucb1x00_devices);
@@ -57,9 +66,9 @@
 	spin_lock_irqsave(&ucb->io_lock, flags);
 	ucb->io_dir |= out;
 	ucb->io_dir &= ~in;
+	spin_unlock_irqrestore(&ucb->io_lock, flags);
 
 	ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir);
-	spin_unlock_irqrestore(&ucb->io_lock, flags);
 }
 
 /**
@@ -85,9 +94,9 @@
 	spin_lock_irqsave(&ucb->io_lock, flags);
 	ucb->io_out |= set;
 	ucb->io_out &= ~clear;
+	spin_unlock_irqrestore(&ucb->io_lock, flags);
 
 	ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out);
-	spin_unlock_irqrestore(&ucb->io_lock, flags);
 }
 
 /**
@@ -177,7 +186,7 @@
 		schedule_timeout(1);
 	}
 
-	return UCB_ADC_DAT(val);
+	return UCB_IS_1400(ucb->id) ? (val & 0x3ff) : ((val & 0x7fe0) >> 5);
 }
 
 /**
@@ -222,6 +231,47 @@
 	return IRQ_HANDLED;
 }
 
+/*
+ * A restriction with interrupts exists when using the ucb1400, as
+ * the codec read/write routines may sleep while waiting for codec
+ * access completion and uses semaphores for access control to the
+ * AC97 bus.  A complete codec read cycle could take  anywhere from
+ * 60 to 100uSec so we *definitely* don't want to spin inside the
+ * interrupt handler waiting for codec access.  So, we handle the
+ * interrupt by scheduling a RT kernel thread to run in process
+ * context instead of interrupt context.
+ */
+static int ucb1x00_thread(void *_ucb)
+{
+	struct task_struct *tsk = current;
+	struct ucb1x00 *ucb = _ucb;
+
+	tsk->policy = SCHED_FIFO;
+	tsk->rt_priority = 1;
+
+	while (!kthread_should_stop()) {
+		wait_for_completion_interruptible(&ucb->irq_wait);
+		if (try_to_freeze())
+			continue;
+		ucb1x00_irq(ucb->irq, ucb);
+		enable_irq(ucb->irq);
+	}
+
+	ucb->irq_task = NULL;
+	return 0;
+}
+
+static irqreturn_t ucb1x00_threaded_irq(int irqnr, void *devid, struct pt_regs *regs)
+{
+	struct ucb1x00 *ucb = devid;
+	if (irqnr == ucb->irq) {
+		disable_irq(ucb->irq);
+		complete(&ucb->irq_wait);
+		return IRQ_HANDLED;
+	}
+	return IRQ_NONE;
+}
+
 /**
  *	ucb1x00_hook_irq - hook a UCB1x00 interrupt
  *	@ucb:   UCB1x00 structure describing chip
@@ -276,17 +326,27 @@
 	if (idx < 16) {
 		spin_lock_irqsave(&ucb->lock, flags);
 
-		ucb1x00_enable(ucb);
-		if (edges & UCB_RISING) {
+		if (edges & UCB_RISING)			
 			ucb->irq_ris_enbl |= 1 << idx;
-			ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
-		}
-		if (edges & UCB_FALLING) {
+		if (edges & UCB_FALLING)
 			ucb->irq_fal_enbl |= 1 << idx;
-			ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
-		}
-		ucb1x00_disable(ucb);
+
 		spin_unlock_irqrestore(&ucb->lock, flags);
+
+		ucb1x00_enable(ucb);
+		ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
+		ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
+		ucb1x00_disable(ucb);
+
+		/* This prevents spurious interrupts on the UCB1400 */
+		ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 1 << idx);
+		ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0);
+
+		ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
+		ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
+
+		ucb1x00_disable(ucb);
+
 	}
 }
 
@@ -306,16 +366,20 @@
 		spin_lock_irqsave(&ucb->lock, flags);
 
 		ucb1x00_enable(ucb);
-		if (edges & UCB_RISING) {
+		if (edges & UCB_RISING)
 			ucb->irq_ris_enbl &= ~(1 << idx);
-			ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
-		}
-		if (edges & UCB_FALLING) {
+		
+		if (edges & UCB_FALLING) 
 			ucb->irq_fal_enbl &= ~(1 << idx);
-			ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
-		}
-		ucb1x00_disable(ucb);
+		
 		spin_unlock_irqrestore(&ucb->lock, flags);
+
+ 		ucb1x00_enable(ucb);
+                ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
+                ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
+                ucb1x00_disable(ucb);
+
+	
 	}
 }
 
@@ -348,16 +412,17 @@
 		ucb->irq_ris_enbl &= ~(1 << idx);
 		ucb->irq_fal_enbl &= ~(1 << idx);
 
-		ucb1x00_enable(ucb);
-		ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
-		ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
-		ucb1x00_disable(ucb);
-
 		irq->fn = NULL;
 		irq->devid = NULL;
 		ret = 0;
 	}
 	spin_unlock_irq(&ucb->lock);
+
+	ucb1x00_enable(ucb);
+	ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl);
+	ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl);
+	ucb1x00_disable(ucb);
+
 	return ret;
 
 bad:
@@ -479,7 +544,7 @@
 	mcp_enable(mcp);
 	id = mcp_reg_read(mcp, UCB_ID);
 
-	if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) {
+	if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143 && !UCB_IS_1400(id)) {
 		printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id);
 		goto err_disable;
 	}
@@ -492,29 +557,41 @@
 	memset(ucb, 0, sizeof(struct ucb1x00));
 
 	ucb->cdev.class = &ucb1x00_class;
-	ucb->cdev.dev = &mcp->attached_device;
+	ucb->cdev.dev = mcp->dev;
 	strlcpy(ucb->cdev.class_id, "ucb1x00", sizeof(ucb->cdev.class_id));
 
 	spin_lock_init(&ucb->lock);
 	spin_lock_init(&ucb->io_lock);
 	sema_init(&ucb->adc_sem, 1);
+	init_completion(&ucb->irq_wait);
 
 	ucb->id  = id;
 	ucb->mcp = mcp;
 	ucb->irq = ucb1x00_detect_irq(ucb);
 	if (ucb->irq == NO_IRQ) {
-		printk(KERN_ERR "UCB1x00: IRQ probe failed\n");
-		ret = -ENODEV;
-		goto err_free;
+		printk(KERN_ERR "UCB1x00: IRQ probe auto-detect failed.. hardcoding IRQ..\n");
+		ucb->irq = 164;
+		//ret = -ENODEV;
+		//goto err_free;
 	}
 
-	ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING,
-			  "UCB1x00", ucb);
+	ret = request_irq(ucb->irq,
+			  UCB_IS_1400(id) ? ucb1x00_threaded_irq : ucb1x00_irq,
+			  0, "UCB1x00", ucb);
+
 	if (ret) {
 		printk(KERN_ERR "ucb1x00: unable to grab irq%d: %d\n",
 			ucb->irq, ret);
 		goto err_free;
 	}
+	if (UCB_IS_1400(id)) {
+		ucb->irq_task = kthread_run(ucb1x00_thread, ucb, "kUCB1x00d");
+		if (IS_ERR(ucb->irq_task)) {
+			ret = PTR_ERR(ucb->irq_task);
+			ucb->irq_task = NULL;
+			goto err_irq;
+		}
+	}
 
 	mcp_set_drvdata(mcp, ucb);
 
@@ -532,6 +609,8 @@
 	goto out;
 
  err_irq:
+	if (UCB_IS_1400(id) && ucb->irq_task)
+		kthread_stop(ucb->irq_task);
 	free_irq(ucb->irq, ucb);
  err_free:
 	kfree(ucb);
@@ -554,6 +633,8 @@
 	}
 	mutex_unlock(&ucb1x00_mutex);
 
+	if (UCB_IS_1400(ucb->id) && ucb->irq_task)
+		kthread_stop(ucb->irq_task);
 	free_irq(ucb->irq, ucb);
 	class_device_unregister(&ucb->cdev);
 }

Index: linux-2.6.15gum/drivers/mfd/ucb1x00-ts.c
===================================================================
--- linux-2.6.15gum.orig/drivers/mfd/ucb1x00-ts.c
+++ linux-2.6.15gum/drivers/mfd/ucb1x00-ts.c
@@ -33,10 +33,8 @@
 #include <linux/slab.h>
 #include <linux/kthread.h>
 
-#include <asm/dma.h>
-#include <asm/semaphore.h>
-#include <asm/arch/collie.h>
 #include <asm/mach-types.h>
+#include <asm/arch-sa1100/collie.h>
 
 #include "ucb1x00.h"
 
@@ -45,13 +43,14 @@
 	struct input_dev	*idev;
 	struct ucb1x00		*ucb;
 
-	wait_queue_head_t	irq_wait;
+	struct completion	irq_wait;
 	struct task_struct	*rtask;
 	u16			x_res;
 	u16			y_res;
 
 	unsigned int		restart:1;
 	unsigned int		adcsync:1;
+	unsigned int		go_thread;
 };
 
 static int adcsync;
@@ -205,7 +204,6 @@
 {
 	struct ucb1x00_ts *ts = _ts;
 	struct task_struct *tsk = current;
-	DECLARE_WAITQUEUE(wait, tsk);
 	int valid;
 
 	/*
@@ -217,10 +215,8 @@
 
 	valid = 0;
 
-	add_wait_queue(&ts->irq_wait, &wait);
-	while (!kthread_should_stop()) {
+	while (!kthread_should_stop() && ts->go_thread) {
 		unsigned int x, y, p;
-		signed long timeout;
 
 		ts->restart = 0;
 
@@ -242,8 +238,6 @@
 
 
 		if (ucb1x00_ts_pen_down(ts)) {
-			set_task_state(tsk, TASK_INTERRUPTIBLE);
-
 			ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING);
 			ucb1x00_disable(ts->ucb);
 
@@ -256,7 +250,16 @@
 				valid = 0;
 			}
 
-			timeout = MAX_SCHEDULE_TIMEOUT;
+			/*
+			 * Since ucb1x00_enable_irq() might sleep due
+			 * to the way the UCB1400 regs are accessed, we
+			 * can't use set_task_state() before that call,
+			 * and not changing state before enabling the
+			 * interrupt is racy. A completion handler avoids
+			 * the issue.
+			 */
+			wait_for_completion_interruptible(&ts->irq_wait);
+
 		} else {
 			ucb1x00_disable(ts->ucb);
 
@@ -271,16 +274,12 @@
 			}
 
 			set_task_state(tsk, TASK_INTERRUPTIBLE);
-			timeout = HZ / 100;
+			schedule_timeout(HZ/100);
 		}
 
 		try_to_freeze();
-
-		schedule_timeout(timeout);
 	}
 
-	remove_wait_queue(&ts->irq_wait, &wait);
-
 	ts->rtask = NULL;
 	return 0;
 }
@@ -293,7 +292,7 @@
 {
 	struct ucb1x00_ts *ts = id;
 	ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING);
-	wake_up(&ts->irq_wait);
+	complete(&ts->irq_wait);
 }
 
 static int ucb1x00_ts_open(struct input_dev *idev)
@@ -303,7 +302,7 @@
 
 	BUG_ON(ts->rtask);
 
-	init_waitqueue_head(&ts->irq_wait);
+	init_completion(&ts->irq_wait);
 	ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts);
 	if (ret < 0)
 		goto out;
@@ -318,6 +317,8 @@
 	ucb1x00_adc_disable(ts->ucb);
 
 	ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd");
+	ts->go_thread = 1; //start thread!
+
 	if (!IS_ERR(ts->rtask)) {
 		ret = 0;
 	} else {
@@ -337,9 +338,14 @@
 {
 	struct ucb1x00_ts *ts = idev->private;
 
+
+	ts->go_thread = 0; //Stop thread!
+	complete(&ts->irq_wait);
+
 	if (ts->rtask)
 		kthread_stop(ts->rtask);
 
+
 	ucb1x00_enable(ts->ucb);
 	ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
 	ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
@@ -358,7 +364,7 @@
 		 * after sleep.
 		 */
 		ts->restart = 1;
-		wake_up(&ts->irq_wait);
+		complete(&ts->irq_wait);
 	}
 	return 0;
 }

Index: linux-2.6.15gum/drivers/mfd/ucb1x00.h
===================================================================
--- a/drivers/mfd/ucb1x00.h~org	2006-12-29 13:43:38.000000000 -0500
+++ a/drivers/mfd/ucb1x00.h	2006-12-29 13:44:48.000000000 -0500
@@ -94,6 +94,7 @@
 #define UCB_ID		0x0c
 #define UCB_ID_1200		0x1004
 #define UCB_ID_1300		0x1005
+#define UCB_ID_1400		0x4304
 #define UCB_ID_TC35143          0x9712
 
 #define UCB_MODE	0x0d
@@ -111,6 +112,8 @@
 	spinlock_t		lock;
 	struct mcp		*mcp;
 	unsigned int		irq;
+	struct task_struct	*irq_task;
+	struct completion	irq_wait;
 	struct semaphore	adc_sem;
 	spinlock_t		io_lock;
 	u16			id;
Index: linux-2.6.15gum/drivers/mfd/mcp-ac97.c
===================================================================
--- /dev/null
+++ linux-2.6.15gum/drivers/mfd/mcp-ac97.c
@@ -0,0 +1,153 @@
+/*
+ * linux/drivers/misc/mcp-ac97.c
+ *
+ * Author:	Nicolas Pitre
+ * Created:	Jan 14, 2005
+ * Copyright:	(C) MontaVista Software Inc.
+ *
+ * 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.
+ *
+ * This module provides the minimum replacement for mcp-core.c allowing for
+ * the UCB1400 chip to be driven by the ucb1x00 driver over an AC97 link.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/ac97_codec.h>
+
+#include "mcp.h"
+
+/* ucb1x00 SIB register to ucb1400 AC-link register mapping */
+
+static const unsigned char regmap[] = {
+	0x5a,	/* UCB_IO_DATA */
+	0X5C,	/* UCB_IO_DIR */
+	0X5E,	/* UCB_IE_RIS */
+	0x60,	/* UCB_IE_FAL */
+	0x62,	/* UCB_IE_STATUS */
+	0,	/* UCB_TC_A */
+	0,	/* UCB_TC_B */
+	0,	/* UCB_AC_A */
+	0,	/* UCB_AC_B */
+	0x64,	/* UCB_TS_CR */
+	0x66,	/* UCB_ADC_CR */
+	0x68,	/* UCB_ADC_DATA */
+	0x7e,	/* UCB_ID */
+	0,	/* UCB_MODE */
+};
+
+unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
+{
+	ac97_t *ac97 = to_ac97_t(mcp->dev);
+	if (reg < ARRAY_SIZE(regmap)) {
+		reg = regmap[reg];
+		if (reg)
+			return ac97->bus->ops->read(ac97, reg);
+	}
+	return -1;
+}
+EXPORT_SYMBOL(mcp_reg_read);
+
+void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
+{
+	ac97_t *ac97 = to_ac97_t(mcp->dev);
+	if (reg < ARRAY_SIZE(regmap)) {
+		reg = regmap[reg];
+		if (reg)
+			ac97->bus->ops->write(ac97, reg, val);
+	}
+}
+EXPORT_SYMBOL(mcp_reg_write);
+
+void mcp_enable(struct mcp *mcp)
+{
+}
+EXPORT_SYMBOL(mcp_enable);
+
+void mcp_disable(struct mcp *mcp)
+{
+}
+EXPORT_SYMBOL(mcp_disable);
+
+#define to_mcp_driver(d)	container_of(d, struct mcp_driver, drv)
+
+static int mcp_probe(struct device *dev)
+{
+	struct mcp_driver *drv = to_mcp_driver(dev->driver);
+	struct mcp *mcp;
+	int ret;
+
+	ret = -ENOMEM;
+	mcp = kmalloc(sizeof(*mcp), GFP_KERNEL);
+	if (mcp) {
+		memset(mcp, 0, sizeof(*mcp));
+		mcp->owner = THIS_MODULE;
+		mcp->dev = dev;
+		ret = drv->probe(mcp);
+		if (ret)
+			kfree(mcp);
+	}
+	if (!ret)
+		dev_set_drvdata(dev, mcp);
+	return ret;
+}
+
+static int mcp_remove(struct device *dev)
+{
+	struct mcp_driver *drv = to_mcp_driver(dev->driver);
+	struct mcp *mcp = dev_get_drvdata(dev);
+
+	drv->remove(mcp);
+	dev_set_drvdata(dev, NULL);
+	kfree(mcp);
+	return 0;
+}
+
+static int mcp_suspend(struct device *dev, pm_message_t state)
+{
+	struct mcp_driver *drv = to_mcp_driver(dev->driver);
+	struct mcp *mcp = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (drv->suspend)
+		ret = drv->suspend(mcp, state);
+	return ret;
+}
+
+static int mcp_resume(struct device *dev)
+{
+	struct mcp_driver *drv = to_mcp_driver(dev->driver);
+	struct mcp *mcp = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (drv->resume)
+		ret = drv->resume(mcp);
+	return ret;
+}
+
+int mcp_driver_register(struct mcp_driver *mcpdrv)
+{
+	mcpdrv->drv.owner = THIS_MODULE;
+	mcpdrv->drv.bus = &ac97_bus_type;
+	mcpdrv->drv.probe = mcp_probe;
+	mcpdrv->drv.remove = mcp_remove;
+	mcpdrv->drv.suspend = mcp_suspend;
+	mcpdrv->drv.resume = mcp_resume;
+	return driver_register(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_register);
+
+void mcp_driver_unregister(struct mcp_driver *mcpdrv)
+{
+	driver_unregister(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_unregister);
+
+MODULE_LICENSE("GPL");
Index: linux-2.6.15gum/drivers/input/touchscreen/Kconfig
===================================================================
--- linux-2.6.15gum.orig/drivers/input/touchscreen/Kconfig
+++ linux-2.6.15gum/drivers/input/touchscreen/Kconfig
@@ -11,6 +11,25 @@ menuconfig INPUT_TOUCHSCREEN
 
 if INPUT_TOUCHSCREEN
 
+config UCB1400
+	bool
+
+config TOUCHSCREEN_UCB1400
+	tristate "UCB1400 Touchscreen support"
+	depends on ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_PXA
+	select SND_AC97_BUS
+	select UCB1400
+	help
+	  Say Y here if you have a touchscreen connected to a UCB1400 ADC chip
+	  on the AC97 bus of a PXA255/PXA270 host.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ucb1x00-ts.  It will also build the modules
+	  ucb1x00-core and mcp-ac97 which provide the compatibility layers
+	  down to the AC97 bus.
+
 config TOUCHSCREEN_BITSY
 	tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"
 	depends on SA1100_BITSY
Index: linux-2.6.15gum/drivers/input/Kconfig
===================================================================
--- linux-2.6.15gum.orig/drivers/input/Kconfig
+++ linux-2.6.15gum/drivers/input/Kconfig
@@ -87,7 +87,7 @@ config INPUT_JOYDEV
 	  module will be called joydev.
 
 config INPUT_TSDEV
-	tristate "Touchscreen interface"
+	tristate "Compaq touchscreen interface"
 	---help---
 	  Say Y here if you have an application that only can understand the
 	  Compaq touchscreen protocol for absolute pointer data. This is