summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/omap4-keypad.c
blob: 28da0e46968994aa1646fc9f0d63b14b6cfa0e06 (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
/*
 * OMAP4 Keypad Driver
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * Author: Abraham Arce <x0066660@ti.com>
 * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

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

#include <linux/platform_data/omap4-keypad.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	(1 << 0)
#define OMAP4_DEF_IRQENABLE_LONGKEY	(1 << 1)
#define OMAP4_DEF_IRQENABLE_TIMEOUTEN	(1 << 2)
#define OMAP4_DEF_WUP_EVENT_ENA		(1 << 0)
#define OMAP4_DEF_WUP_LONG_KEY_ENA	(1 << 1)
#define OMAP4_DEF_CTRL_NOSOFTMODE	(1 << 1)
#define OMAP4_DEF_CTRLPTVVALUE		(1 << 2)
#define OMAP4_DEF_CTRLPTV		(1 << 1)

/* OMAP4 values */
#define OMAP4_VAL_IRQDISABLE		0x00
#define OMAP4_VAL_DEBOUNCINGTIME	0x07
#define OMAP4_VAL_FUNCTIONALCFG		0x1E

#define OMAP4_MASK_IRQSTATUSDISABLE	0xFFFF

enum {
	KBD_REVISION_OMAP4 = 0,
	KBD_REVISION_OMAP5,
};

struct omap4_keypad {
	struct input_dev *input;

	void __iomem *base;
	unsigned int irq;

	unsigned int rows;
	unsigned int cols;
	u32 reg_offset;
	u32 irqreg_offset;
	unsigned int row_shift;
	unsigned char key_state[8];
	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);
}


/* Interrupt handler */
static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
{
	struct omap4_keypad *keypad_data = dev_id;
	struct input_dev *input_dev = keypad_data->input;
	unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
	unsigned int col, row, code, changed;
	u32 *new_state = (u32 *) key_state;

	/* Disable interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
			 OMAP4_VAL_IRQDISABLE);

	*new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
	*(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);

	for (row = 0; row < keypad_data->rows; row++) {
		changed = key_state[row] ^ keypad_data->key_state[row];
		if (!changed)
			continue;

		for (col = 0; col < keypad_data->cols; col++) {
			if (changed & (1 << col)) {
				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],
						 key_state[row] & (1 << col));
			}
		}
	}

	input_sync(input_dev);

	memcpy(keypad_data->key_state, key_state,
		sizeof(keypad_data->key_state));

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

	/* enable interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
		OMAP4_DEF_IRQENABLE_EVENTEN |
				OMAP4_DEF_IRQENABLE_LONGKEY);

	return IRQ_HANDLED;
}

static int omap4_keypad_open(struct input_dev *input)
{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);

	pm_runtime_get_sync(input->dev.parent);

	disable_irq(keypad_data->irq);

	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
			OMAP4_VAL_FUNCTIONALCFG);
	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
			OMAP4_VAL_DEBOUNCINGTIME);
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
			OMAP4_VAL_IRQDISABLE);
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
			OMAP4_DEF_IRQENABLE_EVENTEN |
				OMAP4_DEF_IRQENABLE_LONGKEY);
	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
			OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);

	enable_irq(keypad_data->irq);

	return 0;
}

static void omap4_keypad_close(struct input_dev *input)
{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);

	disable_irq(keypad_data->irq);

	/* Disable interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
			 OMAP4_VAL_IRQDISABLE);

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

	enable_irq(keypad_data->irq);

	pm_runtime_put_sync(input->dev.parent);
}

static int __devinit omap4_keypad_probe(struct platform_device *pdev)
{
	const struct omap4_keypad_platform_data *pdata;
	struct omap4_keypad *keypad_data;
	struct input_dev *input_dev;
	struct resource *res;
	resource_size_t size;
	unsigned int row_shift, max_keys;
	int rev;
	int irq;
	int error;

	/* platform data */
	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data defined\n");
		return -EINVAL;
	}

	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) {
		dev_err(&pdev->dev, "no keyboard irq assigned\n");
		return -EINVAL;
	}

	if (!pdata->keymap_data) {
		dev_err(&pdev->dev, "no keymap data defined\n");
		return -EINVAL;
	}

	row_shift = get_count_order(pdata->cols);
	max_keys = pdata->rows << row_shift;

	keypad_data = kzalloc(sizeof(struct omap4_keypad) +
				max_keys * sizeof(keypad_data->keymap[0]),
			      GFP_KERNEL);
	if (!keypad_data) {
		dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
		return -ENOMEM;
	}

	size = resource_size(res);

	res = request_mem_region(res->start, size, pdev->name);
	if (!res) {
		dev_err(&pdev->dev, "can't request mem region\n");
		error = -EBUSY;
		goto err_free_keypad;
	}

	keypad_data->base = ioremap(res->start, resource_size(res));
	if (!keypad_data->base) {
		dev_err(&pdev->dev, "can't ioremap mem resource\n");
		error = -ENOMEM;
		goto err_release_mem;
	}

	keypad_data->irq = irq;
	keypad_data->row_shift = row_shift;
	keypad_data->rows = pdata->rows;
	keypad_data->cols = pdata->cols;

	/*
	* Enable clocks for the keypad module so that we can read
	* revision register.
	*/
	pm_runtime_enable(&pdev->dev);
	error = pm_runtime_get_sync(&pdev->dev);
	if (error) {
		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
		goto err_unmap;
	}
	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(&pdev->dev,
			"Keypad reports unsupported revision %d", rev);
		error = -EINVAL;
		goto err_pm_put_sync;
	}

	/* input device allocation */
	keypad_data->input = input_dev = input_allocate_device();
	if (!input_dev) {
		error = -ENOMEM;
		goto err_pm_put_sync;
	}

	input_dev->name = pdev->name;
	input_dev->dev.parent = &pdev->dev;
	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_dev->keycode	= keypad_data->keymap;
	input_dev->keycodesize	= sizeof(keypad_data->keymap[0]);
	input_dev->keycodemax	= max_keys;

	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_REP, input_dev->evbit);

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

	input_set_drvdata(input_dev, keypad_data);

	matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
			input_dev->keycode, input_dev->keybit);

	error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
			     IRQF_TRIGGER_RISING,
			     "omap4-keypad", keypad_data);
	if (error) {
		dev_err(&pdev->dev, "failed to register interrupt\n");
		goto err_free_input;
	}

	pm_runtime_put_sync(&pdev->dev);

	error = input_register_device(keypad_data->input);
	if (error < 0) {
		dev_err(&pdev->dev, "failed to register input device\n");
		goto err_pm_disable;
	}

	platform_set_drvdata(pdev, keypad_data);
	return 0;

err_pm_disable:
	pm_runtime_disable(&pdev->dev);
	free_irq(keypad_data->irq, keypad_data);
err_free_input:
	input_free_device(input_dev);
err_pm_put_sync:
	pm_runtime_put_sync(&pdev->dev);
err_unmap:
	iounmap(keypad_data->base);
err_release_mem:
	release_mem_region(res->start, size);
err_free_keypad:
	kfree(keypad_data);
	return error;
}

static int __devexit omap4_keypad_remove(struct platform_device *pdev)
{
	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
	struct resource *res;

	free_irq(keypad_data->irq, keypad_data);

	pm_runtime_disable(&pdev->dev);

	input_unregister_device(keypad_data->input);

	iounmap(keypad_data->base);

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

	kfree(keypad_data);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver omap4_keypad_driver = {
	.probe		= omap4_keypad_probe,
	.remove		= __devexit_p(omap4_keypad_remove),
	.driver		= {
		.name	= "omap4-keypad",
		.owner	= THIS_MODULE,
	},
};
module_platform_driver(omap4_keypad_driver);

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