summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/omap4-keypad.c
blob: 43375b38ee5926f31a653dfe1efb801b927332b3 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OMAP4 Keypad Driver
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * Author: Abraham Arce <x0066660@ti.com>
 * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>

/* OMAP4 registers */
#define OMAP4_KBD_REVISION		0x00
#define OMAP4_KBD_SYSCONFIG		0x10
#define OMAP4_KBD_SYSSTATUS		0x14
#define OMAP4_KBD_IRQSTATUS		0x18
#define OMAP4_KBD_IRQENABLE		0x1C
#define OMAP4_KBD_WAKEUPENABLE		0x20
#define OMAP4_KBD_PENDING		0x24
#define OMAP4_KBD_CTRL			0x28
#define OMAP4_KBD_DEBOUNCINGTIME	0x2C
#define OMAP4_KBD_LONGKEYTIME		0x30
#define OMAP4_KBD_TIMEOUT		0x34
#define OMAP4_KBD_STATEMACHINE		0x38
#define OMAP4_KBD_ROWINPUTS		0x3C
#define OMAP4_KBD_COLUMNOUTPUTS		0x40
#define OMAP4_KBD_FULLCODE31_0		0x44
#define OMAP4_KBD_FULLCODE63_32		0x48

/* OMAP4 bit definitions */
#define OMAP4_DEF_IRQENABLE_EVENTEN	BIT(0)
#define OMAP4_DEF_IRQENABLE_LONGKEY	BIT(1)
#define OMAP4_DEF_WUP_EVENT_ENA		BIT(0)
#define OMAP4_DEF_WUP_LONG_KEY_ENA	BIT(1)
#define OMAP4_DEF_CTRL_NOSOFTMODE	BIT(1)
#define OMAP4_DEF_CTRL_PTV_SHIFT	2

/* OMAP4 values */
#define OMAP4_VAL_IRQDISABLE		0x0

/*
 * Errata i689: If a key is released for a time shorter than debounce time,
 * the keyboard will idle and never detect the key release. The workaround
 * is to use at least a 12ms debounce time. See omap5432 TRM chapter
 * "26.4.6.2 Keyboard Controller Timer" for more information.
 */
#define OMAP4_KEYPAD_PTV_DIV_128        0x6
#define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv)     \
	((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
#define OMAP4_VAL_DEBOUNCINGTIME_16MS					\
	OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
#define OMAP4_KEYPAD_AUTOIDLE_MS	50	/* Approximate measured time */
#define OMAP4_KEYPAD_IDLE_CHECK_MS	(OMAP4_KEYPAD_AUTOIDLE_MS / 2)

enum {
	KBD_REVISION_OMAP4 = 0,
	KBD_REVISION_OMAP5,
};

struct omap4_keypad {
	struct input_dev *input;

	void __iomem *base;
	unsigned int irq;
	struct mutex lock;		/* for key scan */

	unsigned int rows;
	unsigned int cols;
	u32 reg_offset;
	u32 irqreg_offset;
	unsigned int row_shift;
	bool no_autorepeat;
	u64 keys;
	unsigned short *keymap;
};

static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
{
	return __raw_readl(keypad_data->base +
				keypad_data->reg_offset + offset);
}

static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
{
	__raw_writel(value,
		     keypad_data->base + keypad_data->reg_offset + offset);
}

static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
{
	return __raw_readl(keypad_data->base +
				keypad_data->irqreg_offset + offset);
}

static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
			     u32 offset, u32 value)
{
	__raw_writel(value,
		     keypad_data->base + keypad_data->irqreg_offset + offset);
}

static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
				    u64 keys, bool down)
{
	struct input_dev *input_dev = keypad_data->input;
	unsigned int col, row, code;
	DECLARE_BITMAP(mask, 64);
	unsigned long bit;
	int events = 0;

	bitmap_from_u64(mask, keys);

	for_each_set_bit(bit, mask, keypad_data->rows * BITS_PER_BYTE) {
		row = bit / BITS_PER_BYTE;
		col = bit % BITS_PER_BYTE;
		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);

		input_event(input_dev, EV_MSC, MSC_SCAN, code);
		input_report_key(input_dev, keypad_data->keymap[code], down);

		events++;
	}

	if (events)
		input_sync(input_dev);

	return events;
}

static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
{
	u64 changed;

	mutex_lock(&keypad_data->lock);

	changed = keys ^ keypad_data->keys;

	/*
	 * Report key up events separately and first. This matters in case we
	 * lost key-up interrupt and just now catching up.
	 */
	omap4_keypad_report_keys(keypad_data, changed & ~keys, false);

	/* Report key down events */
	omap4_keypad_report_keys(keypad_data, changed & keys, true);

	keypad_data->keys = keys;

	mutex_unlock(&keypad_data->lock);
}

/* Interrupt handlers */
static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
{
	struct omap4_keypad *keypad_data = dev_id;

	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
		return IRQ_WAKE_THREAD;

	return IRQ_NONE;
}

static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
{
	struct omap4_keypad *keypad_data = dev_id;
	struct device *dev = keypad_data->input->dev.parent;
	u32 low, high;
	int error;
	u64 keys;

	error = pm_runtime_get_sync(dev);
	if (error < 0) {
		pm_runtime_put_noidle(dev);
		return IRQ_NONE;
	}

	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
	keys = low | (u64)high << 32;

	omap4_keypad_scan_keys(keypad_data, keys);

	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return IRQ_HANDLED;
}

static int omap4_keypad_open(struct input_dev *input)
{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);
	struct device *dev = input->dev.parent;
	int error;

	error = pm_runtime_get_sync(dev);
	if (error < 0) {
		pm_runtime_put_noidle(dev);
		return error;
	}

	disable_irq(keypad_data->irq);

	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
			OMAP4_DEF_CTRL_NOSOFTMODE |
			(OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
			OMAP4_VAL_DEBOUNCINGTIME_16MS);
	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
			OMAP4_DEF_IRQENABLE_EVENTEN);
	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
			OMAP4_DEF_WUP_EVENT_ENA);

	enable_irq(keypad_data->irq);

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return 0;
}

static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
{
	/* Disable interrupts and wake-up events */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
			 OMAP4_VAL_IRQDISABLE);
	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);

	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
}

static void omap4_keypad_close(struct input_dev *input)
{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);
	struct device *dev = input->dev.parent;
	int error;

	error = pm_runtime_get_sync(dev);
	if (error < 0)
		pm_runtime_put_noidle(dev);

	disable_irq(keypad_data->irq);
	omap4_keypad_stop(keypad_data);
	enable_irq(keypad_data->irq);

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
}

static int omap4_keypad_parse_dt(struct device *dev,
				 struct omap4_keypad *keypad_data)
{
	struct device_node *np = dev->of_node;
	int err;

	err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
					     &keypad_data->cols);
	if (err)
		return err;

	if (of_get_property(np, "linux,input-no-autorepeat", NULL))
		keypad_data->no_autorepeat = true;

	return 0;
}

static int omap4_keypad_check_revision(struct device *dev,
				       struct omap4_keypad *keypad_data)
{
	unsigned int rev;

	rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
	rev &= 0x03 << 30;
	rev >>= 30;
	switch (rev) {
	case KBD_REVISION_OMAP4:
		keypad_data->reg_offset = 0x00;
		keypad_data->irqreg_offset = 0x00;
		break;
	case KBD_REVISION_OMAP5:
		keypad_data->reg_offset = 0x10;
		keypad_data->irqreg_offset = 0x0c;
		break;
	default:
		dev_err(dev, "Keypad reports unsupported revision %d", rev);
		return -EINVAL;
	}

	return 0;
}

/*
 * Errata ID i689 "1.32 Keyboard Key Up Event Can Be Missed".
 * Interrupt may not happen for key-up events. We must clear stuck
 * key-up events after the keyboard hardware has auto-idled.
 */
static int __maybe_unused omap4_keypad_runtime_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
	u32 active;

	active = kbd_readl(keypad_data, OMAP4_KBD_STATEMACHINE);
	if (active) {
		pm_runtime_mark_last_busy(dev);
		return -EBUSY;
	}

	omap4_keypad_scan_keys(keypad_data, 0);

	return 0;
}

static const struct dev_pm_ops omap4_keypad_pm_ops = {
	SET_RUNTIME_PM_OPS(omap4_keypad_runtime_suspend, NULL, NULL)
};

static void omap4_disable_pm(void *d)
{
	pm_runtime_dont_use_autosuspend(d);
	pm_runtime_disable(d);
}

static int omap4_keypad_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct omap4_keypad *keypad_data;
	struct input_dev *input_dev;
	struct resource *res;
	unsigned int max_keys;
	int irq;
	int error;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "no base address specified\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
	if (!keypad_data) {
		dev_err(dev, "keypad_data memory allocation failed\n");
		return -ENOMEM;
	}

	keypad_data->irq = irq;
	mutex_init(&keypad_data->lock);
	platform_set_drvdata(pdev, keypad_data);

	error = omap4_keypad_parse_dt(dev, keypad_data);
	if (error)
		return error;

	keypad_data->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(keypad_data->base))
		return PTR_ERR(keypad_data->base);

	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, OMAP4_KEYPAD_IDLE_CHECK_MS);
	pm_runtime_enable(dev);

	error = devm_add_action_or_reset(dev, omap4_disable_pm, dev);
	if (error) {
		dev_err(dev, "unable to register cleanup action\n");
		return error;
	}

	/*
	 * Enable clocks for the keypad module so that we can read
	 * revision register.
	 */
	error = pm_runtime_get_sync(dev);
	if (error) {
		dev_err(dev, "pm_runtime_get_sync() failed\n");
		pm_runtime_put_noidle(dev);
		return error;
	}

	error = omap4_keypad_check_revision(dev, keypad_data);
	if (!error) {
		/* Ensure device does not raise interrupts */
		omap4_keypad_stop(keypad_data);
	}

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
	if (error)
		return error;

	/* input device allocation */
	keypad_data->input = input_dev = devm_input_allocate_device(dev);
	if (!input_dev)
		return -ENOMEM;

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0001;

	input_dev->open = omap4_keypad_open;
	input_dev->close = omap4_keypad_close;

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	if (!keypad_data->no_autorepeat)
		__set_bit(EV_REP, input_dev->evbit);

	input_set_drvdata(input_dev, keypad_data);

	keypad_data->row_shift = get_count_order(keypad_data->cols);
	max_keys = keypad_data->rows << keypad_data->row_shift;
	keypad_data->keymap = devm_kcalloc(dev,
					   max_keys,
					   sizeof(keypad_data->keymap[0]),
					   GFP_KERNEL);
	if (!keypad_data->keymap) {
		dev_err(dev, "Not enough memory for keymap\n");
		return -ENOMEM;
	}

	error = matrix_keypad_build_keymap(NULL, NULL,
					   keypad_data->rows, keypad_data->cols,
					   keypad_data->keymap, input_dev);
	if (error) {
		dev_err(dev, "failed to build keymap\n");
		return error;
	}

	error = devm_request_threaded_irq(dev, keypad_data->irq,
					  omap4_keypad_irq_handler,
					  omap4_keypad_irq_thread_fn,
					  IRQF_ONESHOT,
					  "omap4-keypad", keypad_data);
	if (error) {
		dev_err(dev, "failed to register interrupt\n");
		return error;
	}

	error = input_register_device(keypad_data->input);
	if (error) {
		dev_err(dev, "failed to register input device\n");
		return error;
	}

	device_init_wakeup(dev, true);
	error = dev_pm_set_wake_irq(dev, keypad_data->irq);
	if (error)
		dev_warn(dev, "failed to set up wakeup irq: %d\n", error);

	return 0;
}

static int omap4_keypad_remove(struct platform_device *pdev)
{
	dev_pm_clear_wake_irq(&pdev->dev);

	return 0;
}

static const struct of_device_id omap_keypad_dt_match[] = {
	{ .compatible = "ti,omap4-keypad" },
	{},
};
MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);

static struct platform_driver omap4_keypad_driver = {
	.probe		= omap4_keypad_probe,
	.remove		= omap4_keypad_remove,
	.driver		= {
		.name	= "omap4-keypad",
		.of_match_table = omap_keypad_dt_match,
		.pm = &omap4_keypad_pm_ops,
	},
};
module_platform_driver(omap4_keypad_driver);

MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("OMAP4 Keypad Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap4-keypad");