summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/pxa27x_keypad.c
blob: 3dea0c5077a9ad623b35dfb7a5c627f6da5a5d28 (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
/*
 * linux/drivers/input/keyboard/pxa27x_keypad.c
 *
 * Driver for the pxa27x matrix keyboard controller.
 *
 * Created:	Feb 22, 2007
 * Author:	Rodolfo Giometti <giometti@linux.it>
 *
 * Based on a previous implementations by Kevin O'Connor
 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
 * on some suggestions by Nicolas Pitre <nico@cam.org>.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include <asm/arch/hardware.h>
#include <asm/arch/pxa27x_keypad.h>

/*
 * Keypad Controller registers
 */
#define KPC             0x0000 /* Keypad Control register */
#define KPDK            0x0008 /* Keypad Direct Key register */
#define KPREC           0x0010 /* Keypad Rotary Encoder register */
#define KPMK            0x0018 /* Keypad Matrix Key register */
#define KPAS            0x0020 /* Keypad Automatic Scan register */

/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
#define KPASMKP0        0x0028
#define KPASMKP1        0x0030
#define KPASMKP2        0x0038
#define KPASMKP3        0x0040
#define KPKDI           0x0048

/* bit definitions */
#define KPC_MKRN(n)	((((n) - 1) & 0x7) << 26) /* matrix key row number */
#define KPC_MKCN(n)	((((n) - 1) & 0x7) << 23) /* matrix key column number */
#define KPC_DKN(n)	((((n) - 1) & 0x7) << 6)  /* direct key number */

#define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
#define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
#define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
#define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */

#define KPC_MS(n)	(0x1 << (13 + (n)))	/* Matrix scan line 'n' */
#define KPC_MS_ALL      (0xff << 13)

#define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
#define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
#define KPC_DK_DEB_SEL	(0x1 <<  9)  /* Direct Keypad Debounce Select */
#define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
#define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
#define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
#define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
#define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
#define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */

#define KPDK_DKP        (0x1 << 31)
#define KPDK_DK(n)	((n) & 0xff)

#define KPREC_OF1       (0x1 << 31)
#define kPREC_UF1       (0x1 << 30)
#define KPREC_OF0       (0x1 << 15)
#define KPREC_UF0       (0x1 << 14)

#define KPREC_RECOUNT0(n)	((n) & 0xff)
#define KPREC_RECOUNT1(n)	(((n) >> 16) & 0xff)

#define KPMK_MKP        (0x1 << 31)
#define KPAS_SO         (0x1 << 31)
#define KPASMKPx_SO     (0x1 << 31)

#define KPAS_MUKP(n)	(((n) >> 26) & 0x1f)
#define KPAS_RP(n)	(((n) >> 4) & 0xf)
#define KPAS_CP(n)	((n) & 0xf)

#define KPASMKP_MKC_MASK	(0xff)

#define keypad_readl(off)	__raw_readl(keypad->mmio_base + (off))
#define keypad_writel(off, v)	__raw_writel((v), keypad->mmio_base + (off))

#define MAX_MATRIX_KEY_NUM	(8 * 8)

struct pxa27x_keypad {
	struct pxa27x_keypad_platform_data *pdata;

	struct clk *clk;
	struct input_dev *input_dev;
	void __iomem *mmio_base;

	/* matrix key code map */
	unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];

	/* state row bits of each column scan */
	uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
	uint32_t direct_key_state;

	unsigned int direct_key_mask;

	int rotary_rel_code[2];
	int rotary_up_key[2];
	int rotary_down_key[2];
};

static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
{
	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
	struct input_dev *input_dev = keypad->input_dev;
	unsigned int *key;
	int i;

	key = &pdata->matrix_key_map[0];
	for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
		int row = ((*key) >> 28) & 0xf;
		int col = ((*key) >> 24) & 0xf;
		int code = (*key) & 0xffffff;

		keypad->matrix_keycodes[(row << 3) + col] = code;
		set_bit(code, input_dev->keybit);
	}

	keypad->rotary_up_key[0] = pdata->rotary0_up_key;
	keypad->rotary_up_key[1] = pdata->rotary1_up_key;
	keypad->rotary_down_key[0] = pdata->rotary0_down_key;
	keypad->rotary_down_key[1] = pdata->rotary1_down_key;
	keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
	keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;

	if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
		set_bit(pdata->rotary0_up_key, input_dev->keybit);
		set_bit(pdata->rotary0_down_key, input_dev->keybit);
	} else
		set_bit(pdata->rotary0_rel_code, input_dev->relbit);

	if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
		set_bit(pdata->rotary1_up_key, input_dev->keybit);
		set_bit(pdata->rotary1_down_key, input_dev->keybit);
	} else
		set_bit(pdata->rotary1_rel_code, input_dev->relbit);
}

static inline unsigned int lookup_matrix_keycode(
		struct pxa27x_keypad *keypad, int row, int col)
{
	return keypad->matrix_keycodes[(row << 3) + col];
}

static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
{
	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
	int row, col, num_keys_pressed = 0;
	uint32_t new_state[MAX_MATRIX_KEY_COLS];
	uint32_t kpas = keypad_readl(KPAS);

	num_keys_pressed = KPAS_MUKP(kpas);

	memset(new_state, 0, sizeof(new_state));

	if (num_keys_pressed == 0)
		goto scan;

	if (num_keys_pressed == 1) {
		col = KPAS_CP(kpas);
		row = KPAS_RP(kpas);

		/* if invalid row/col, treat as no key pressed */
		if (col >= pdata->matrix_key_cols ||
		    row >= pdata->matrix_key_rows)
			goto scan;

		new_state[col] = (1 << row);
		goto scan;
	}

	if (num_keys_pressed > 1) {
		uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
		uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
		uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
		uint32_t kpasmkp3 = keypad_readl(KPASMKP3);

		new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
		new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
		new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
		new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
		new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
		new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
		new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
		new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
	}
scan:
	for (col = 0; col < pdata->matrix_key_cols; col++) {
		uint32_t bits_changed;

		bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
		if (bits_changed == 0)
			continue;

		for (row = 0; row < pdata->matrix_key_rows; row++) {
			if ((bits_changed & (1 << row)) == 0)
				continue;

			input_report_key(keypad->input_dev,
				lookup_matrix_keycode(keypad, row, col),
				new_state[col] & (1 << row));
		}
	}
	input_sync(keypad->input_dev);
	memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
}

#define DEFAULT_KPREC	(0x007f007f)

static inline int rotary_delta(uint32_t kprec)
{
	if (kprec & KPREC_OF0)
		return (kprec & 0xff) + 0x7f;
	else if (kprec & KPREC_UF0)
		return (kprec & 0xff) - 0x7f - 0xff;
	else
		return (kprec & 0xff) - 0x7f;
}

static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
{
	struct input_dev *dev = keypad->input_dev;

	if (delta == 0)
		return;

	if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
		int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
					    keypad->rotary_down_key[r];

		/* simulate a press-n-release */
		input_report_key(dev, keycode, 1);
		input_sync(dev);
		input_report_key(dev, keycode, 0);
		input_sync(dev);
	} else {
		input_report_rel(dev, keypad->rotary_rel_code[r], delta);
		input_sync(dev);
	}
}

static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
{
	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
	uint32_t kprec;

	/* read and reset to default count value */
	kprec = keypad_readl(KPREC);
	keypad_writel(KPREC, DEFAULT_KPREC);

	if (pdata->enable_rotary0)
		report_rotary_event(keypad, 0, rotary_delta(kprec));

	if (pdata->enable_rotary1)
		report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
}

static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
{
	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
	unsigned int new_state;
	uint32_t kpdk, bits_changed;
	int i;

	kpdk = keypad_readl(KPDK);

	if (pdata->enable_rotary0 || pdata->enable_rotary1)
		pxa27x_keypad_scan_rotary(keypad);

	if (pdata->direct_key_map == NULL)
		return;

	new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
	bits_changed = keypad->direct_key_state ^ new_state;

	if (bits_changed == 0)
		return;

	for (i = 0; i < pdata->direct_key_num; i++) {
		if (bits_changed & (1 << i))
			input_report_key(keypad->input_dev,
					pdata->direct_key_map[i],
					(new_state & (1 << i)));
	}
	input_sync(keypad->input_dev);
	keypad->direct_key_state = new_state;
}

static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
{
	struct pxa27x_keypad *keypad = dev_id;
	unsigned long kpc = keypad_readl(KPC);

	if (kpc & KPC_DI)
		pxa27x_keypad_scan_direct(keypad);

	if (kpc & KPC_MI)
		pxa27x_keypad_scan_matrix(keypad);

	return IRQ_HANDLED;
}

static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
{
	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
	unsigned int mask = 0, direct_key_num = 0;
	unsigned long kpc = 0;

	/* enable matrix keys with automatic scan */
	if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
		kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
		kpc |= KPC_MKRN(pdata->matrix_key_rows) |
		       KPC_MKCN(pdata->matrix_key_cols);
	}

	/* enable rotary key, debounce interval same as direct keys */
	if (pdata->enable_rotary0) {
		mask |= 0x03;
		direct_key_num = 2;
		kpc |= KPC_REE0;
	}

	if (pdata->enable_rotary1) {
		mask |= 0x0c;
		direct_key_num = 4;
		kpc |= KPC_REE1;
	}

	if (pdata->direct_key_num > direct_key_num)
		direct_key_num = pdata->direct_key_num;

	keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;

	/* enable direct key */
	if (direct_key_num)
		kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);

	keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
	keypad_writel(KPREC, DEFAULT_KPREC);
	keypad_writel(KPKDI, pdata->debounce_interval);
}

static int pxa27x_keypad_open(struct input_dev *dev)
{
	struct pxa27x_keypad *keypad = input_get_drvdata(dev);

	/* Enable unit clock */
	clk_enable(keypad->clk);
	pxa27x_keypad_config(keypad);

	return 0;
}

static void pxa27x_keypad_close(struct input_dev *dev)
{
	struct pxa27x_keypad *keypad = input_get_drvdata(dev);

	/* Disable clock unit */
	clk_disable(keypad->clk);
}

#ifdef CONFIG_PM
static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);

	clk_disable(keypad->clk);
	return 0;
}

static int pxa27x_keypad_resume(struct platform_device *pdev)
{
	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users) {
		/* Enable unit clock */
		clk_enable(keypad->clk);
		pxa27x_keypad_config(keypad);
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
}
#else
#define pxa27x_keypad_suspend	NULL
#define pxa27x_keypad_resume	NULL
#endif

#define res_size(res)	((res)->end - (res)->start + 1)

static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
{
	struct pxa27x_keypad *keypad;
	struct input_dev *input_dev;
	struct resource *res;
	int irq, error;

	keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
	if (keypad == NULL) {
		dev_err(&pdev->dev, "failed to allocate driver data\n");
		return -ENOMEM;
	}

	keypad->pdata = pdev->dev.platform_data;
	if (keypad->pdata == NULL) {
		dev_err(&pdev->dev, "no platform data defined\n");
		error = -EINVAL;
		goto failed_free;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get keypad irq\n");
		error = -ENXIO;
		goto failed_free;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to get I/O memory\n");
		error = -ENXIO;
		goto failed_free;
	}

	res = request_mem_region(res->start, res_size(res), pdev->name);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		error = -EBUSY;
		goto failed_free;
	}

	keypad->mmio_base = ioremap(res->start, res_size(res));
	if (keypad->mmio_base == NULL) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		error = -ENXIO;
		goto failed_free_mem;
	}

	keypad->clk = clk_get(&pdev->dev, "KBDCLK");
	if (IS_ERR(keypad->clk)) {
		dev_err(&pdev->dev, "failed to get keypad clock\n");
		error = PTR_ERR(keypad->clk);
		goto failed_free_io;
	}

	/* Create and register the input driver. */
	input_dev = input_allocate_device();
	if (!input_dev) {
		dev_err(&pdev->dev, "failed to allocate input device\n");
		error = -ENOMEM;
		goto failed_put_clk;
	}

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->open = pxa27x_keypad_open;
	input_dev->close = pxa27x_keypad_close;
	input_dev->dev.parent = &pdev->dev;

	keypad->input_dev = input_dev;
	input_set_drvdata(input_dev, keypad);

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
		BIT_MASK(EV_REL);

	pxa27x_keypad_build_keycode(keypad);
	platform_set_drvdata(pdev, keypad);

	error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
			    pdev->name, keypad);
	if (error) {
		dev_err(&pdev->dev, "failed to request IRQ\n");
		goto failed_free_dev;
	}

	/* Register the input device */
	error = input_register_device(input_dev);
	if (error) {
		dev_err(&pdev->dev, "failed to register input device\n");
		goto failed_free_irq;
	}

	return 0;

failed_free_irq:
	free_irq(irq, pdev);
	platform_set_drvdata(pdev, NULL);
failed_free_dev:
	input_free_device(input_dev);
failed_put_clk:
	clk_put(keypad->clk);
failed_free_io:
	iounmap(keypad->mmio_base);
failed_free_mem:
	release_mem_region(res->start, res_size(res));
failed_free:
	kfree(keypad);
	return error;
}

static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
{
	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
	struct resource *res;

	free_irq(platform_get_irq(pdev, 0), pdev);

	clk_disable(keypad->clk);
	clk_put(keypad->clk);

	input_unregister_device(keypad->input_dev);
	input_free_device(keypad->input_dev);

	iounmap(keypad->mmio_base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, res_size(res));

	platform_set_drvdata(pdev, NULL);
	kfree(keypad);
	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:pxa27x-keypad");

static struct platform_driver pxa27x_keypad_driver = {
	.probe		= pxa27x_keypad_probe,
	.remove		= __devexit_p(pxa27x_keypad_remove),
	.suspend	= pxa27x_keypad_suspend,
	.resume		= pxa27x_keypad_resume,
	.driver		= {
		.name	= "pxa27x-keypad",
		.owner	= THIS_MODULE,
	},
};

static int __init pxa27x_keypad_init(void)
{
	return platform_driver_register(&pxa27x_keypad_driver);
}

static void __exit pxa27x_keypad_exit(void)
{
	platform_driver_unregister(&pxa27x_keypad_driver);
}

module_init(pxa27x_keypad_init);
module_exit(pxa27x_keypad_exit);

MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
MODULE_LICENSE("GPL");