summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/bf54x-keys.c
blob: fc88fb48d70d6740ef96f8fdbe9afc32760218c5 (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
/*
 * File:         drivers/input/keyboard/bf54x-keys.c
 * Based on:
 * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
 *
 * Created:
 * Description:  keypad driver for Analog Devices Blackfin BF54x Processors
 *
 *
 * Modified:
 *               Copyright 2007-2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>

#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>

#include <asm/portmux.h>
#include <mach/bf54x_keys.h>

#define DRV_NAME	"bf54x-keys"
#define TIME_SCALE	100	/* 100 ns */
#define	MAX_MULT	(0xFF * TIME_SCALE)
#define MAX_RC		8	/* Max Row/Col */

static const u16 per_rows[] = {
	P_KEY_ROW7,
	P_KEY_ROW6,
	P_KEY_ROW5,
	P_KEY_ROW4,
	P_KEY_ROW3,
	P_KEY_ROW2,
	P_KEY_ROW1,
	P_KEY_ROW0,
	0
};

static const u16 per_cols[] = {
	P_KEY_COL7,
	P_KEY_COL6,
	P_KEY_COL5,
	P_KEY_COL4,
	P_KEY_COL3,
	P_KEY_COL2,
	P_KEY_COL1,
	P_KEY_COL0,
	0
};

struct bf54x_kpad {
	struct input_dev *input;
	int irq;
	unsigned short lastkey;
	unsigned short *keycode;
	struct timer_list timer;
	unsigned int keyup_test_jiffies;
	unsigned short kpad_msel;
	unsigned short kpad_prescale;
	unsigned short kpad_ctl;
};

static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
			struct input_dev *input, u16 keyident)
{
	u16 i;

	for (i = 0; i < input->keycodemax; i++)
		if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
			return bf54x_kpad->keycode[i];
	return -1;
}

static inline void bfin_keycodecpy(unsigned short *keycode,
			const unsigned int *pdata_kc,
			unsigned short keymapsize)
{
	unsigned int i;

	for (i = 0; i < keymapsize; i++) {
		keycode[i] = pdata_kc[i] & 0xffff;
		keycode[i + keymapsize] = pdata_kc[i] >> 16;
	}
}

static inline u16 bfin_kpad_get_prescale(u32 timescale)
{
	u32 sclk = get_sclk();

	return ((((sclk / 1000) * timescale) / 1024) - 1);
}

static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
{
	return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
}

static inline void bfin_kpad_clear_irq(void)
{
	bfin_write_KPAD_STAT(0xFFFF);
	bfin_write_KPAD_ROWCOL(0xFFFF);
}

static void bfin_kpad_timer(unsigned long data)
{
	struct platform_device *pdev =  (struct platform_device *) data;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
		/* Try again later */
		mod_timer(&bf54x_kpad->timer,
			  jiffies + bf54x_kpad->keyup_test_jiffies);
		return;
	}

	input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
	input_sync(bf54x_kpad->input);

	/* Clear IRQ Status */

	bfin_kpad_clear_irq();
	enable_irq(bf54x_kpad->irq);
}

static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
	struct input_dev *input = bf54x_kpad->input;
	int key;
	u16 rowcol = bfin_read_KPAD_ROWCOL();

	key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);

	input_report_key(input, key, 1);
	input_sync(input);

	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
		disable_irq_nosync(bf54x_kpad->irq);
		bf54x_kpad->lastkey = key;
		mod_timer(&bf54x_kpad->timer,
			  jiffies + bf54x_kpad->keyup_test_jiffies);
	} else {
		input_report_key(input, key, 0);
		input_sync(input);

		bfin_kpad_clear_irq();
	}

	return IRQ_HANDLED;
}

static int bfin_kpad_probe(struct platform_device *pdev)
{
	struct bf54x_kpad *bf54x_kpad;
	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
	struct input_dev *input;
	int i, error;

	if (!pdata->rows || !pdata->cols || !pdata->keymap) {
		dev_err(&pdev->dev, "no rows, cols or keymap from pdata\n");
		return -EINVAL;
	}

	if (!pdata->keymapsize ||
	    pdata->keymapsize > (pdata->rows * pdata->cols)) {
		dev_err(&pdev->dev, "invalid keymapsize\n");
		return -EINVAL;
	}

	bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
	if (!bf54x_kpad)
		return -ENOMEM;

	platform_set_drvdata(pdev, bf54x_kpad);

	/* Allocate memory for keymap followed by private LUT */
	bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
					sizeof(unsigned short) * 2, GFP_KERNEL);
	if (!bf54x_kpad->keycode) {
		error = -ENOMEM;
		goto out;
	}

	if (!pdata->debounce_time || pdata->debounce_time > MAX_MULT ||
	    !pdata->coldrive_time || pdata->coldrive_time > MAX_MULT) {
		dev_warn(&pdev->dev,
			"invalid platform debounce/columndrive time\n");
		bfin_write_KPAD_MSEL(0xFF0);	/* Default MSEL	*/
	} else {
		bfin_write_KPAD_MSEL(
			((pdata->debounce_time / TIME_SCALE)
						& DBON_SCALE) |
			(((pdata->coldrive_time / TIME_SCALE) << 8)
						& COLDRV_SCALE));

	}

	if (!pdata->keyup_test_interval)
		bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
	else
		bf54x_kpad->keyup_test_jiffies =
			msecs_to_jiffies(pdata->keyup_test_interval);

	if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
				    DRV_NAME)) {
		dev_err(&pdev->dev, "requesting peripherals failed\n");
		error = -EFAULT;
		goto out0;
	}

	if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
				    DRV_NAME)) {
		dev_err(&pdev->dev, "requesting peripherals failed\n");
		error = -EFAULT;
		goto out1;
	}

	bf54x_kpad->irq = platform_get_irq(pdev, 0);
	if (bf54x_kpad->irq < 0) {
		error = -ENODEV;
		goto out2;
	}

	error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
				0, DRV_NAME, pdev);
	if (error) {
		dev_err(&pdev->dev, "unable to claim irq %d\n",
			bf54x_kpad->irq);
		goto out2;
	}

	input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto out3;
	}

	bf54x_kpad->input = input;

	input->name = pdev->name;
	input->phys = "bf54x-keys/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, bf54x_kpad);

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	input->keycodesize = sizeof(unsigned short);
	input->keycodemax = pdata->keymapsize;
	input->keycode = bf54x_kpad->keycode;

	bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);

	/* setup input device */
	__set_bit(EV_KEY, input->evbit);

	if (pdata->repeat)
		__set_bit(EV_REP, input->evbit);

	for (i = 0; i < input->keycodemax; i++)
		__set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev, "unable to register input device\n");
		goto out4;
	}

	/* Init Keypad Key Up/Release test timer */

	setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);

	bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));

	bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
				(((pdata->rows - 1) << 10) & KPAD_ROWEN) |
				(2 & KPAD_IRQMODE));

	bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);

	device_init_wakeup(&pdev->dev, 1);

	return 0;

out4:
	input_free_device(input);
out3:
	free_irq(bf54x_kpad->irq, pdev);
out2:
	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
out1:
	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
out0:
	kfree(bf54x_kpad->keycode);
out:
	kfree(bf54x_kpad);

	return error;
}

static int bfin_kpad_remove(struct platform_device *pdev)
{
	struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	del_timer_sync(&bf54x_kpad->timer);
	free_irq(bf54x_kpad->irq, pdev);

	input_unregister_device(bf54x_kpad->input);

	peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
	peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);

	kfree(bf54x_kpad->keycode);
	kfree(bf54x_kpad);

	return 0;
}

#ifdef CONFIG_PM
static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL();
	bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE();
	bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL();

	if (device_may_wakeup(&pdev->dev))
		enable_irq_wake(bf54x_kpad->irq);

	return 0;
}

static int bfin_kpad_resume(struct platform_device *pdev)
{
	struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);

	bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel);
	bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale);
	bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl);

	if (device_may_wakeup(&pdev->dev))
		disable_irq_wake(bf54x_kpad->irq);

	return 0;
}
#else
# define bfin_kpad_suspend NULL
# define bfin_kpad_resume  NULL
#endif

static struct platform_driver bfin_kpad_device_driver = {
	.driver		= {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= bfin_kpad_probe,
	.remove		= bfin_kpad_remove,
	.suspend	= bfin_kpad_suspend,
	.resume		= bfin_kpad_resume,
};
module_platform_driver(bfin_kpad_device_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
MODULE_ALIAS("platform:bf54x-keys");