summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/locomokbd.c
blob: 0d74312d5b02c1e853ac76368c9a1794819ea3a0 (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
/*
 * LoCoMo keyboard driver for Linux-based ARM PDAs:
 * 	- SHARP Zaurus Collie (SL-5500)
 * 	- SHARP Zaurus Poodle (SL-5600)
 *
 * Copyright (c) 2005 John Lenz
 * Based on from xtkbd.c
 *
 *
 * 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/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>

#include <asm/hardware/locomo.h>
#include <asm/irq.h>

MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
MODULE_DESCRIPTION("LoCoMo keyboard driver");
MODULE_LICENSE("GPL");

#define LOCOMOKBD_NUMKEYS	128

#define KEY_ACTIVITY		KEY_F16
#define KEY_CONTACT		KEY_F18
#define KEY_CENTER		KEY_F15

static const unsigned char
locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
	0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0,				/* 0 - 9 */
	0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT,			/* 10 - 19 */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,						/* 20 - 29 */
	0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0,				/* 30 - 39 */
	0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT,					/* 40 - 49 */
	KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T,		/* 50 - 59 */
	KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0,			/* 60 - 69 */
	KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0,	/* 70 - 79 */
	0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J,		/* 80 - 89 */
	KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0,				/* 90 - 99 */
	0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A,		/* 100 - 109 */
	KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0,		/* 110 - 119 */
	KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0		/* 120 - 128 */
};

#define KB_ROWS			16
#define KB_COLS			8
#define KB_ROWMASK(r)		(1 << (r))
#define SCANCODE(c,r)		( ((c)<<4) + (r) + 1 )

#define KB_DELAY		8
#define SCAN_INTERVAL		(HZ/10)

struct locomokbd {
	unsigned char keycode[LOCOMOKBD_NUMKEYS];
	struct input_dev *input;
	char phys[32];

	unsigned long base;
	spinlock_t lock;

	struct timer_list timer;
	unsigned long suspend_jiffies;
	unsigned int count_cancel;
};

/* helper functions for reading the keyboard matrix */
static inline void locomokbd_charge_all(unsigned long membase)
{
	locomo_writel(0x00FF, membase + LOCOMO_KSC);
}

static inline void locomokbd_activate_all(unsigned long membase)
{
	unsigned long r;

	locomo_writel(0, membase + LOCOMO_KSC);
	r = locomo_readl(membase + LOCOMO_KIC);
	r &= 0xFEFF;
	locomo_writel(r, membase + LOCOMO_KIC);
}

static inline void locomokbd_activate_col(unsigned long membase, int col)
{
	unsigned short nset;
	unsigned short nbset;

	nset = 0xFF & ~(1 << col);
	nbset = (nset << 8) + nset;
	locomo_writel(nbset, membase + LOCOMO_KSC);
}

static inline void locomokbd_reset_col(unsigned long membase, int col)
{
	unsigned short nbset;

	nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
	locomo_writel(nbset, membase + LOCOMO_KSC);
}

/*
 * The LoCoMo 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 locomokbd_scankeyboard(struct locomokbd *locomokbd)
{
	unsigned int row, col, rowd;
	unsigned long flags;
	unsigned int num_pressed;
	unsigned long membase = locomokbd->base;

	spin_lock_irqsave(&locomokbd->lock, flags);

	locomokbd_charge_all(membase);

	num_pressed = 0;
	for (col = 0; col < KB_COLS; col++) {

		locomokbd_activate_col(membase, col);
		udelay(KB_DELAY);

		rowd = ~locomo_readl(membase + LOCOMO_KIB);
		for (row = 0; row < KB_ROWS; row++) {
			unsigned int scancode, pressed, key;

			scancode = SCANCODE(col, row);
			pressed = rowd & KB_ROWMASK(row);
			key = locomokbd->keycode[scancode];

			input_report_key(locomokbd->input, key, pressed);
			if (likely(!pressed))
				continue;

			num_pressed++;

			/* The "Cancel/ESC" key is labeled "On/Off" on
			 * Collie and Poodle and should suspend the device
			 * if it was pressed for more than a second. */
			if (unlikely(key == KEY_ESC)) {
				if (!time_after(jiffies,
					locomokbd->suspend_jiffies + HZ))
					continue;
				if (locomokbd->count_cancel++
					!= (HZ/SCAN_INTERVAL + 1))
					continue;
				input_event(locomokbd->input, EV_PWR,
					KEY_SUSPEND, 1);
				locomokbd->suspend_jiffies = jiffies;
			} else
				locomokbd->count_cancel = 0;
		}
		locomokbd_reset_col(membase, col);
	}
	locomokbd_activate_all(membase);

	input_sync(locomokbd->input);

	/* if any keys are pressed, enable the timer */
	if (num_pressed)
		mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
	else
		locomokbd->count_cancel = 0;

	spin_unlock_irqrestore(&locomokbd->lock, flags);
}

/*
 * LoCoMo keyboard interrupt handler.
 */
static irqreturn_t locomokbd_interrupt(int irq, void *dev_id)
{
	struct locomokbd *locomokbd = dev_id;
	u16 r;

	r = locomo_readl(locomokbd->base + LOCOMO_KIC);
	if ((r & 0x0001) == 0)
		return IRQ_HANDLED;

	locomo_writel(r & ~0x0100, locomokbd->base + LOCOMO_KIC); /* Ack */

	/** wait chattering delay **/
	udelay(100);

	locomokbd_scankeyboard(locomokbd);
	return IRQ_HANDLED;
}

/*
 * LoCoMo timer checking for released keys
 */
static void locomokbd_timer_callback(unsigned long data)
{
	struct locomokbd *locomokbd = (struct locomokbd *) data;

	locomokbd_scankeyboard(locomokbd);
}

static int locomokbd_open(struct input_dev *dev)
{
	struct locomokbd *locomokbd = input_get_drvdata(dev);
	u16 r;
	
	r = locomo_readl(locomokbd->base + LOCOMO_KIC) | 0x0010;
	locomo_writel(r, locomokbd->base + LOCOMO_KIC);
	return 0;
}

static void locomokbd_close(struct input_dev *dev)
{
	struct locomokbd *locomokbd = input_get_drvdata(dev);
	u16 r;
	
	r = locomo_readl(locomokbd->base + LOCOMO_KIC) & ~0x0010;
	locomo_writel(r, locomokbd->base + LOCOMO_KIC);
}

static int locomokbd_probe(struct locomo_dev *dev)
{
	struct locomokbd *locomokbd;
	struct input_dev *input_dev;
	int i, err;

	locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!locomokbd || !input_dev) {
		err = -ENOMEM;
		goto err_free_mem;
	}

	/* try and claim memory region */
	if (!request_mem_region((unsigned long) dev->mapbase,
				dev->length,
				LOCOMO_DRIVER_NAME(dev))) {
		err = -EBUSY;
		printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
		goto err_free_mem;
	}

	locomo_set_drvdata(dev, locomokbd);

	locomokbd->base = (unsigned long) dev->mapbase;

	spin_lock_init(&locomokbd->lock);

	setup_timer(&locomokbd->timer, locomokbd_timer_callback,
		    (unsigned long)locomokbd);

	locomokbd->suspend_jiffies = jiffies;

	locomokbd->input = input_dev;
	strcpy(locomokbd->phys, "locomokbd/input0");

	input_dev->name = "LoCoMo keyboard";
	input_dev->phys = locomokbd->phys;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->open = locomokbd_open;
	input_dev->close = locomokbd_close;
	input_dev->dev.parent = &dev->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
				BIT_MASK(EV_PWR);
	input_dev->keycode = locomokbd->keycode;
	input_dev->keycodesize = sizeof(locomokbd_keycode[0]);
	input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode);

	input_set_drvdata(input_dev, locomokbd);

	memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
	for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
		set_bit(locomokbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	/* attempt to get the interrupt */
	err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
	if (err) {
		printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
		goto err_release_region;
	}

	err = input_register_device(locomokbd->input);
	if (err)
		goto err_free_irq;

	return 0;

 err_free_irq:
	free_irq(dev->irq[0], locomokbd);
 err_release_region:
	release_mem_region((unsigned long) dev->mapbase, dev->length);
	locomo_set_drvdata(dev, NULL);
 err_free_mem:
	input_free_device(input_dev);
	kfree(locomokbd);

	return err;
}

static int locomokbd_remove(struct locomo_dev *dev)
{
	struct locomokbd *locomokbd = locomo_get_drvdata(dev);

	free_irq(dev->irq[0], locomokbd);

	del_timer_sync(&locomokbd->timer);

	input_unregister_device(locomokbd->input);
	locomo_set_drvdata(dev, NULL);

	release_mem_region((unsigned long) dev->mapbase, dev->length);

	kfree(locomokbd);

	return 0;
}

static struct locomo_driver keyboard_driver = {
	.drv = {
		.name = "locomokbd"
	},
	.devid	= LOCOMO_DEVID_KEYBOARD,
	.probe	= locomokbd_probe,
	.remove	= locomokbd_remove,
};

static int __init locomokbd_init(void)
{
	return locomo_driver_register(&keyboard_driver);
}

static void __exit locomokbd_exit(void)
{
	locomo_driver_unregister(&keyboard_driver);
}

module_init(locomokbd_init);
module_exit(locomokbd_exit);