aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/omap-keypad.c
blob: d0d5226d9cd4981398997d60db6b01949bc0030a (plain) (blame)
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
/*
 * linux/drivers/input/keyboard/omap-keypad.c
 *
 * OMAP Keypad Driver
 *
 * Copyright (C) 2003 Nokia Corporation
 * Written by Timo Teräs <ext-timo.teras@nokia.com>
 *
 * Added support for H2 & H3 Keypad
 * Copyright (C) 2004 Texas Instruments
 *
 * 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/types.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/platform_data/gpio-omap.h>
#include <linux/platform_data/keypad-omap.h>

#undef NEW_BOARD_LEARNING_MODE

static void omap_kp_tasklet(unsigned long);
static void omap_kp_timer(unsigned long);

static unsigned char keypad_state[8];
static DEFINE_MUTEX(kp_enable_mutex);
static int kp_enable = 1;
static int kp_cur_group = -1;

struct omap_kp {
	struct input_dev *input;
	struct timer_list timer;
	int irq;
	unsigned int rows;
	unsigned int cols;
	unsigned long delay;
	unsigned int debounce;
	unsigned short keymap[];
};

static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);

static unsigned int *row_gpios;
static unsigned int *col_gpios;

#ifdef CONFIG_ARCH_OMAP2
static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
{
	int col;

	for (col = 0; col < omap_kp->cols; col++)
		gpio_set_value(col_gpios[col], value & (1 << col));
}

static u8 get_row_gpio_val(struct omap_kp *omap_kp)
{
	int row;
	u8 value = 0;

	for (row = 0; row < omap_kp->rows; row++) {
		if (gpio_get_value(row_gpios[row]))
			value |= (1 << row);
	}
	return value;
}
#else
#define		set_col_gpio_val(x, y)	do {} while (0)
#define		get_row_gpio_val(x)	0
#endif

static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
{
	/* disable keyboard interrupt and schedule for handling */
	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	tasklet_schedule(&kp_tasklet);

	return IRQ_HANDLED;
}

static void omap_kp_timer(unsigned long data)
{
	tasklet_schedule(&kp_tasklet);
}

static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
{
	int col = 0;

	/* disable keyboard interrupt and schedule for handling */
	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	/* read the keypad status */
	omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
	for (col = 0; col < omap_kp->cols; col++) {
		omap_writew(~(1 << col) & 0xff,
			    OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);

		udelay(omap_kp->delay);

		state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
					 OMAP_MPUIO_KBR_LATCH) & 0xff;
	}
	omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
	udelay(2);
}

static void omap_kp_tasklet(unsigned long data)
{
	struct omap_kp *omap_kp_data = (struct omap_kp *) data;
	unsigned short *keycodes = omap_kp_data->input->keycode;
	unsigned int row_shift = get_count_order(omap_kp_data->cols);
	unsigned char new_state[8], changed, key_down = 0;
	int col, row;
	int spurious = 0;

	/* check for any changes */
	omap_kp_scan_keypad(omap_kp_data, new_state);

	/* check for changes and print those */
	for (col = 0; col < omap_kp_data->cols; col++) {
		changed = new_state[col] ^ keypad_state[col];
		key_down |= new_state[col];
		if (changed == 0)
			continue;

		for (row = 0; row < omap_kp_data->rows; row++) {
			int key;
			if (!(changed & (1 << row)))
				continue;
#ifdef NEW_BOARD_LEARNING_MODE
			printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
			       row, (new_state[col] & (1 << row)) ?
			       "pressed" : "released");
#else
			key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
			if (key < 0) {
				printk(KERN_WARNING
				      "omap-keypad: Spurious key event %d-%d\n",
				       col, row);
				/* We scan again after a couple of seconds */
				spurious = 1;
				continue;
			}

			if (!(kp_cur_group == (key & GROUP_MASK) ||
			      kp_cur_group == -1))
				continue;

			kp_cur_group = key & GROUP_MASK;
			input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
					 new_state[col] & (1 << row));
#endif
		}
	}
	input_sync(omap_kp_data->input);
	memcpy(keypad_state, new_state, sizeof(keypad_state));

	if (key_down) {
		int delay = HZ / 20;
		/* some key is pressed - keep irq disabled and use timer
		 * to poll the keypad */
		if (spurious)
			delay = 2 * HZ;
		mod_timer(&omap_kp_data->timer, jiffies + delay);
	} else {
		/* enable interrupts */
		omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
		kp_cur_group = -1;
	}
}

static ssize_t omap_kp_enable_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%u\n", kp_enable);
}

static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct omap_kp *omap_kp = dev_get_drvdata(dev);
	int state;

	if (sscanf(buf, "%u", &state) != 1)
		return -EINVAL;

	if ((state != 1) && (state != 0))
		return -EINVAL;

	mutex_lock(&kp_enable_mutex);
	if (state != kp_enable) {
		if (state)
			enable_irq(omap_kp->irq);
		else
			disable_irq(omap_kp->irq);
		kp_enable = state;
	}
	mutex_unlock(&kp_enable_mutex);

	return strnlen(buf, count);
}

static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);

#ifdef CONFIG_PM
static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
{
	/* Nothing yet */

	return 0;
}

static int omap_kp_resume(struct platform_device *dev)
{
	/* Nothing yet */

	return 0;
}
#else
#define omap_kp_suspend	NULL
#define omap_kp_resume	NULL
#endif

static int omap_kp_probe(struct platform_device *pdev)
{
	struct omap_kp *omap_kp;
	struct input_dev *input_dev;
	struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
	int i, col_idx, row_idx, ret;
	unsigned int row_shift, keycodemax;

	if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
		printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
		return -EINVAL;
	}

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

	omap_kp = kzalloc(sizeof(struct omap_kp) +
			keycodemax * sizeof(unsigned short), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!omap_kp || !input_dev) {
		kfree(omap_kp);
		input_free_device(input_dev);
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, omap_kp);

	omap_kp->input = input_dev;

	/* Disable the interrupt for the MPUIO keyboard */
	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	if (pdata->delay)
		omap_kp->delay = pdata->delay;

	if (pdata->row_gpios && pdata->col_gpios) {
		row_gpios = pdata->row_gpios;
		col_gpios = pdata->col_gpios;
	}

	omap_kp->rows = pdata->rows;
	omap_kp->cols = pdata->cols;

	col_idx = 0;
	row_idx = 0;

	setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);

	/* get the irq and init timer*/
	tasklet_enable(&kp_tasklet);
	kp_tasklet.data = (unsigned long) omap_kp;

	ret = device_create_file(&pdev->dev, &dev_attr_enable);
	if (ret < 0)
		goto err2;

	/* setup input device */
	input_dev->name = "omap-keypad";
	input_dev->phys = "omap-keypad/input0";
	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 = 0x0100;

	if (pdata->rep)
		__set_bit(EV_REP, input_dev->evbit);

	ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
					 pdata->rows, pdata->cols,
					 omap_kp->keymap, input_dev);
	if (ret < 0)
		goto err3;

	ret = input_register_device(omap_kp->input);
	if (ret < 0) {
		printk(KERN_ERR "Unable to register omap-keypad input device\n");
		goto err3;
	}

	if (pdata->dbounce)
		omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);

	/* scan current status and enable interrupt */
	omap_kp_scan_keypad(omap_kp, keypad_state);
	omap_kp->irq = platform_get_irq(pdev, 0);
	if (omap_kp->irq >= 0) {
		if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
				"omap-keypad", omap_kp) < 0)
			goto err4;
	}
	omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);

	return 0;

err4:
	input_unregister_device(omap_kp->input);
	input_dev = NULL;
err3:
	device_remove_file(&pdev->dev, &dev_attr_enable);
err2:
	for (i = row_idx - 1; i >= 0; i--)
		gpio_free(row_gpios[i]);
	for (i = col_idx - 1; i >= 0; i--)
		gpio_free(col_gpios[i]);

	kfree(omap_kp);
	input_free_device(input_dev);

	return -EINVAL;
}

static int omap_kp_remove(struct platform_device *pdev)
{
	struct omap_kp *omap_kp = platform_get_drvdata(pdev);

	/* disable keypad interrupt handling */
	tasklet_disable(&kp_tasklet);
	omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
	free_irq(omap_kp->irq, omap_kp);

	del_timer_sync(&omap_kp->timer);
	tasklet_kill(&kp_tasklet);

	/* unregister everything */
	input_unregister_device(omap_kp->input);

	kfree(omap_kp);

	return 0;
}

static struct platform_driver omap_kp_driver = {
	.probe		= omap_kp_probe,
	.remove		= omap_kp_remove,
	.suspend	= omap_kp_suspend,
	.resume		= omap_kp_resume,
	.driver		= {
		.name	= "omap-keypad",
		.owner	= THIS_MODULE,
	},
};
module_platform_driver(omap_kp_driver);

MODULE_AUTHOR("Timo Teräs");
MODULE_DESCRIPTION("OMAP Keypad Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap-keypad");