aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/tosakbd.c
blob: b12b7ee4b6aa304e9096e9b50afbaeca1beae24b (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
/*
 *  Keyboard driver for Sharp Tosa models (SL-6000x)
 *
 *  Copyright (c) 2005 Dirk Opfer
 *  Copyright (c) 2007 Dmitry Baryshkov
 *
 *  Based on xtkbd.c/locomkbd.c/corgikbd.c
 *
 *  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/platform_device.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include <asm/arch/gpio.h>
#include <asm/arch/tosa.h>

#define KB_ROWMASK(r)		(1 << (r))
#define SCANCODE(r, c)		(((r)<<4) + (c) + 1)
#define NR_SCANCODES		SCANCODE(TOSA_KEY_SENSE_NUM - 1, TOSA_KEY_STROBE_NUM - 1) + 1

#define SCAN_INTERVAL		(HZ/10)

#define KB_DISCHARGE_DELAY	10
#define KB_ACTIVATE_DELAY	10

static unsigned int tosakbd_keycode[NR_SCANCODES] = {
0,
0, KEY_W, 0, 0, 0, KEY_K, KEY_BACKSPACE, KEY_P,
0, 0, 0, 0, 0, 0, 0, 0,
KEY_Q, KEY_E, KEY_T, KEY_Y, 0, KEY_O, KEY_I, KEY_COMMA,
0, 0, 0, 0, 0, 0, 0, 0,
KEY_A, KEY_D, KEY_G, KEY_U, 0, KEY_L, KEY_ENTER, KEY_DOT,
0, 0, 0, 0, 0, 0, 0, 0,
KEY_Z, KEY_C, KEY_V, KEY_J, TOSA_KEY_ADDRESSBOOK, TOSA_KEY_CANCEL, TOSA_KEY_CENTER, TOSA_KEY_OK,
KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 0, 0,
KEY_S, KEY_R, KEY_B, KEY_N, TOSA_KEY_CALENDAR, TOSA_KEY_HOMEPAGE, KEY_LEFTCTRL, TOSA_KEY_LIGHT,
0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,
KEY_TAB, KEY_SLASH, KEY_H, KEY_M, TOSA_KEY_MENU, 0, KEY_UP, 0,
0, 0, TOSA_KEY_FN, 0, 0, 0, 0, 0,
KEY_X, KEY_F, KEY_SPACE, KEY_APOSTROPHE, TOSA_KEY_MAIL, KEY_LEFT, KEY_DOWN, KEY_RIGHT,
0, 0, 0,
};

struct tosakbd {
	unsigned int keycode[ARRAY_SIZE(tosakbd_keycode)];
	struct input_dev *input;
	int suspended;
	spinlock_t lock; /* protect kbd scanning */
	struct timer_list timer;
};


/* Helper functions for reading the keyboard matrix
 * Note: We should really be using pxa_gpio_mode to alter GPDR but it
 *       requires a function call per GPIO bit which is excessive
 *       when we need to access 12 bits at once, multiple times.
 * These functions must be called within local_irq_save()/local_irq_restore()
 * or similar.
 */
#define GET_ROWS_STATUS(c)	((GPLR2 & TOSA_GPIO_ALL_SENSE_BIT) >> TOSA_GPIO_ALL_SENSE_RSHIFT)

static inline void tosakbd_discharge_all(void)
{
	/* STROBE All HiZ */
	GPCR1  = TOSA_GPIO_HIGH_STROBE_BIT;
	GPDR1 &= ~TOSA_GPIO_HIGH_STROBE_BIT;
	GPCR2  = TOSA_GPIO_LOW_STROBE_BIT;
	GPDR2 &= ~TOSA_GPIO_LOW_STROBE_BIT;
}

static inline void tosakbd_activate_all(void)
{
	/* STROBE ALL -> High */
	GPSR1  = TOSA_GPIO_HIGH_STROBE_BIT;
	GPDR1 |= TOSA_GPIO_HIGH_STROBE_BIT;
	GPSR2  = TOSA_GPIO_LOW_STROBE_BIT;
	GPDR2 |= TOSA_GPIO_LOW_STROBE_BIT;

	udelay(KB_DISCHARGE_DELAY);

	/* STATE CLEAR */
	GEDR2 |= TOSA_GPIO_ALL_SENSE_BIT;
}

static inline void tosakbd_activate_col(int col)
{
	if (col <= 5) {
		/* STROBE col -> High, not col -> HiZ */
		GPSR1 = TOSA_GPIO_STROBE_BIT(col);
		GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
	} else {
		/* STROBE col -> High, not col -> HiZ */
		GPSR2 = TOSA_GPIO_STROBE_BIT(col);
		GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
	}
}

static inline void tosakbd_reset_col(int col)
{
	if (col <= 5) {
		/* STROBE col -> Low */
		GPCR1 = TOSA_GPIO_STROBE_BIT(col);
		/* STROBE col -> out, not col -> HiZ */
		GPDR1 = (GPDR1 & ~TOSA_GPIO_HIGH_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
	} else {
		/* STROBE col -> Low */
		GPCR2 = TOSA_GPIO_STROBE_BIT(col);
		/* STROBE col -> out, not col -> HiZ */
		GPDR2 = (GPDR2 & ~TOSA_GPIO_LOW_STROBE_BIT) | TOSA_GPIO_STROBE_BIT(col);
	}
}
/*
 * The tosa keyboard only generates interrupts when a key is pressed.
 * So when a key is pressed, we enable a timer.  This timer scans the
 * keyboard, and this is how we detect when the key is released.
 */

/* Scan the hardware keyboard and push any changes up through the input layer */
static void tosakbd_scankeyboard(struct platform_device *dev)
{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);
	unsigned int row, col, rowd;
	unsigned long flags;
	unsigned int num_pressed = 0;

	spin_lock_irqsave(&tosakbd->lock, flags);

	if (tosakbd->suspended)
		goto out;

	for (col = 0; col < TOSA_KEY_STROBE_NUM; col++) {
		/*
		 * Discharge the output driver capacitatance
		 * in the keyboard matrix. (Yes it is significant..)
		 */
		tosakbd_discharge_all();
		udelay(KB_DISCHARGE_DELAY);

		tosakbd_activate_col(col);
		udelay(KB_ACTIVATE_DELAY);

		rowd = GET_ROWS_STATUS(col);

		for (row = 0; row < TOSA_KEY_SENSE_NUM; row++) {
			unsigned int scancode, pressed;
			scancode = SCANCODE(row, col);
			pressed = rowd & KB_ROWMASK(row);

			if (pressed && !tosakbd->keycode[scancode])
				dev_warn(&dev->dev,
						"unhandled scancode: 0x%02x\n",
						scancode);

			input_report_key(tosakbd->input,
					tosakbd->keycode[scancode],
					pressed);
			if (pressed)
				num_pressed++;
		}

		tosakbd_reset_col(col);
	}

	tosakbd_activate_all();

	input_sync(tosakbd->input);

	/* if any keys are pressed, enable the timer */
	if (num_pressed)
		mod_timer(&tosakbd->timer, jiffies + SCAN_INTERVAL);

 out:
	spin_unlock_irqrestore(&tosakbd->lock, flags);
}

/*
 * tosa keyboard interrupt handler.
 */
static irqreturn_t tosakbd_interrupt(int irq, void *__dev)
{
	struct platform_device *dev = __dev;
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	if (!timer_pending(&tosakbd->timer)) {
		/** wait chattering delay **/
		udelay(20);
		tosakbd_scankeyboard(dev);
	}

	return IRQ_HANDLED;
}

/*
 * tosa timer checking for released keys
 */
static void tosakbd_timer_callback(unsigned long __dev)
{
	struct platform_device *dev = (struct platform_device *)__dev;

	tosakbd_scankeyboard(dev);
}

#ifdef CONFIG_PM
static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&tosakbd->lock, flags);
	tosakbd->suspended = 1;
	spin_unlock_irqrestore(&tosakbd->lock, flags);

	del_timer_sync(&tosakbd->timer);

	return 0;
}

static int tosakbd_resume(struct platform_device *dev)
{
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	tosakbd->suspended = 0;
	tosakbd_scankeyboard(dev);

	return 0;
}
#else
#define tosakbd_suspend		NULL
#define tosakbd_resume		NULL
#endif

static int __devinit tosakbd_probe(struct platform_device *pdev) {

	int i;
	struct tosakbd *tosakbd;
	struct input_dev *input_dev;
	int error;

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

	input_dev = input_allocate_device();
	if (!input_dev) {
		kfree(tosakbd);
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, tosakbd);

	spin_lock_init(&tosakbd->lock);

	/* Init Keyboard rescan timer */
	init_timer(&tosakbd->timer);
	tosakbd->timer.function = tosakbd_timer_callback;
	tosakbd->timer.data = (unsigned long) pdev;

	tosakbd->input = input_dev;

	input_set_drvdata(input_dev, tosakbd);
	input_dev->name = "Tosa Keyboard";
	input_dev->phys = "tosakbd/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;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
	input_dev->keycode = tosakbd->keycode;
	input_dev->keycodesize = sizeof(unsigned int);
	input_dev->keycodemax = ARRAY_SIZE(tosakbd_keycode);

	memcpy(tosakbd->keycode, tosakbd_keycode, sizeof(tosakbd_keycode));

	for (i = 0; i < ARRAY_SIZE(tosakbd_keycode); i++)
		__set_bit(tosakbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
		int gpio = TOSA_GPIO_KEY_SENSE(i);
		int irq;
		error = gpio_request(gpio, "tosakbd");
		if (error < 0) {
			printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
				" error %d\n", gpio, error);
			goto fail;
		}

		error = gpio_direction_input(TOSA_GPIO_KEY_SENSE(i));
		if (error < 0) {
			printk(KERN_ERR "tosakbd: failed to configure input"
				" direction for GPIO %d, error %d\n",
				gpio, error);
			gpio_free(gpio);
			goto fail;
		}

		irq = gpio_to_irq(gpio);
		if (irq < 0) {
			error = irq;
			printk(KERN_ERR "gpio-keys: Unable to get irq number"
				" for GPIO %d, error %d\n",
				gpio, error);
			gpio_free(gpio);
			goto fail;
		}

		error = request_irq(irq, tosakbd_interrupt,
					IRQF_DISABLED | IRQF_TRIGGER_RISING,
					"tosakbd", pdev);

		if (error) {
			printk("tosakbd: Can't get IRQ: %d: error %d!\n",
					irq, error);
			gpio_free(gpio);
			goto fail;
		}
	}

	/* Set Strobe lines as outputs - set high */
	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++) {
		int gpio = TOSA_GPIO_KEY_STROBE(i);
		error = gpio_request(gpio, "tosakbd");
		if (error < 0) {
			printk(KERN_ERR "tosakbd: failed to request GPIO %d, "
				" error %d\n", gpio, error);
			goto fail2;
		}

		error = gpio_direction_output(gpio, 1);
		if (error < 0) {
			printk(KERN_ERR "tosakbd: failed to configure input"
				" direction for GPIO %d, error %d\n",
				gpio, error);
			gpio_free(gpio);
			goto fail;
		}

	}

	error = input_register_device(input_dev);
	if (error) {
		printk(KERN_ERR "tosakbd: Unable to register input device, "
			"error: %d\n", error);
		goto fail;
	}

	printk(KERN_INFO "input: Tosa Keyboard Registered\n");

	return 0;

fail2:
	while (--i >= 0)
		gpio_free(TOSA_GPIO_KEY_STROBE(i));

	i = TOSA_KEY_SENSE_NUM;
fail:
	while (--i >= 0) {
		free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), pdev);
		gpio_free(TOSA_GPIO_KEY_SENSE(i));
	}

	platform_set_drvdata(pdev, NULL);
	input_free_device(input_dev);
	kfree(tosakbd);

	return error;
}

static int __devexit tosakbd_remove(struct platform_device *dev)
{
	int i;
	struct tosakbd *tosakbd = platform_get_drvdata(dev);

	for (i = 0; i < TOSA_KEY_STROBE_NUM; i++)
		gpio_free(TOSA_GPIO_KEY_STROBE(i));

	for (i = 0; i < TOSA_KEY_SENSE_NUM; i++) {
		free_irq(gpio_to_irq(TOSA_GPIO_KEY_SENSE(i)), dev);
		gpio_free(TOSA_GPIO_KEY_SENSE(i));
	}

	del_timer_sync(&tosakbd->timer);

	input_unregister_device(tosakbd->input);

	kfree(tosakbd);

	return 0;
}

static struct platform_driver tosakbd_driver = {
	.probe		= tosakbd_probe,
	.remove		= __devexit_p(tosakbd_remove),
	.suspend	= tosakbd_suspend,
	.resume		= tosakbd_resume,
	.driver		= {
		.name	= "tosa-keyboard",
		.owner	= THIS_MODULE,
	},
};

static int __devinit tosakbd_init(void)
{
	return platform_driver_register(&tosakbd_driver);
}

static void __exit tosakbd_exit(void)
{
	platform_driver_unregister(&tosakbd_driver);
}

module_init(tosakbd_init);
module_exit(tosakbd_exit);

MODULE_AUTHOR("Dirk Opfer <Dirk@Opfer-Online.de>");
MODULE_DESCRIPTION("Tosa Keyboard Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tosa-keyboard");