aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/qtronix.c
blob: 5c9477741a30d54433b9774ff61a8f7b0dda3ecc (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
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
/*
 *
 * BRIEF MODULE DESCRIPTION
 *	Qtronix 990P infrared keyboard driver.
 *
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	ppopov@mvista.com or source@mvista.com
 *
 *
 *  The bottom portion of this driver was take from 
 *  pc_keyb.c  Please see that file for copyrights.
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */


/* 
 * NOTE:  
 *
 *	This driver has only been tested with the Consumer IR
 *	port of the ITE 8172 system controller.
 *
 *	You do not need this driver if you are using the ps/2 or
 *	USB adapter that the keyboard ships with.  You only need 
 *	this driver if your board has a IR port and the keyboard
 *	data is being sent directly to the IR.  In that case,
 *	you also need some low-level IR support. See it8172_cir.c.
 *	
 */

#ifdef CONFIG_QTRONIX_KEYBOARD

#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>

#include <asm/it8172/it8172.h>
#include <asm/it8172/it8172_int.h>
#include <asm/it8172/it8172_cir.h>

#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/mm.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/kbd_ll.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/kbd_kern.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <linux/pc_keyb.h>

#include <asm/keyboard.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/system.h>

#define leading1 0
#define leading2 0xF

#define KBD_CIR_PORT 0
#define AUX_RECONNECT 170 /* scancode when ps2 device is plugged (back) in */

static int data_index;
struct cir_port *cir;
static unsigned char kbdbytes[5];
static unsigned char cir_data[32]; /* we only need 16 chars */

static void kbd_int_handler(int irq, void *dev_id);
static int handle_data(unsigned char *p_data);
static inline void handle_mouse_event(unsigned char scancode);
static inline void handle_keyboard_event(unsigned char scancode, int down);
static int __init psaux_init(void);

static struct aux_queue *queue;	/* Mouse data buffer. */
static int aux_count = 0;

/*
 * Keys accessed through the 'Fn' key
 * The Fn key does not produce a key-up sequence. So, the first
 * time the user presses it, it will be key-down event. The key
 * stays down until the user presses it again.
 */
#define NUM_FN_KEYS 56
static unsigned char fn_keys[NUM_FN_KEYS] = {
	0,0,0,0,0,0,0,0,        /* 0 7   */
	8,9,10,93,0,0,0,0,      /* 8 15  */
	0,0,0,0,0,0,0,5,        /* 16 23 */
	6,7,91,0,0,0,0,0,       /* 24 31 */
	0,0,0,0,0,2,3,4,        /* 32 39 */
	92,0,0,0,0,0,0,0,       /* 40 47 */
	0,0,0,0,11,0,94,95        /* 48 55 */

};

void __init init_qtronix_990P_kbd(void)
{
	int retval;

	cir = (struct cir_port *)kmalloc(sizeof(struct cir_port), GFP_KERNEL);
	if (!cir) {
		printk("Unable to initialize Qtronix keyboard\n");
		return;
	}

	/* 
	 * revisit
	 * this should be programmable, somehow by the, by the user.
	 */
	cir->port = KBD_CIR_PORT;
	cir->baud_rate = 0x1d;
	cir->rdwos = 0;
	cir->rxdcr = 0x3;
	cir->hcfs = 0;
	cir->fifo_tl = 0;
	cir->cfq = 0x1d;
	cir_port_init(cir);

	retval = request_irq(IT8172_CIR0_IRQ, kbd_int_handler, 
			(unsigned long )(IRQF_DISABLED|IRQF_SHARED),
			(const char *)"Qtronix IR Keyboard", (void *)cir);

	if (retval) {
		printk("unable to allocate cir %d irq %d\n", 
				cir->port, IT8172_CIR0_IRQ);
	}
#ifdef CONFIG_PSMOUSE
	psaux_init();
#endif
}

static inline unsigned char BitReverse(unsigned short key)
{
	unsigned char rkey = 0;
	rkey |= (key & 0x1) << 7;
	rkey |= (key & 0x2) << 5;
	rkey |= (key & 0x4) << 3;
	rkey |= (key & 0x8) << 1;
	rkey |= (key & 0x10) >> 1;
	rkey |= (key & 0x20) >> 3;
	rkey |= (key & 0x40) >> 5;
	rkey |= (key & 0x80) >> 7;
	return rkey;

}


static inline u_int8_t UpperByte(u_int8_t data)
{
	return (data >> 4);
}


static inline u_int8_t LowerByte(u_int8_t data)
{
	return (data & 0xF);
}


int CheckSumOk(u_int8_t byte1, u_int8_t byte2, 
		u_int8_t byte3, u_int8_t byte4, u_int8_t byte5)
{
	u_int8_t CheckSum;

	CheckSum = (byte1 & 0x0F) + byte2 + byte3 + byte4 + byte5;
	if ( LowerByte(UpperByte(CheckSum) + LowerByte(CheckSum)) != UpperByte(byte1) )
		return 0;
	else
		return 1;
}


static void kbd_int_handler(int irq, void *dev_id)
{
	struct cir_port *cir;
	int j;
	unsigned char int_status;

	cir = (struct cir_port *)dev_id;
	int_status = get_int_status(cir);
	if (int_status & 0x4) {
		clear_fifo(cir);
		return;
	}

	while (cir_get_rx_count(cir)) {

		cir_data[data_index] = cir_read_data(cir);

		if (data_index == 0) {/* expecting first byte */
			if (cir_data[data_index] != leading1) {
				//printk("!leading byte %x\n", cir_data[data_index]);
				set_rx_active(cir);
				clear_fifo(cir);
				continue;
			}
		}
		if (data_index == 1) {
			if ((cir_data[data_index] & 0xf) != leading2) {
				set_rx_active(cir);
				data_index = 0; /* start over */
				clear_fifo(cir);
				continue;
			}
		}

		if ( (cir_data[data_index] == 0xff)) { /* last byte */
			//printk("data_index %d\n", data_index);
			set_rx_active(cir);
#if 0
			for (j=0; j<=data_index; j++) {
				printk("rx_data %d:  %x\n", j, cir_data[j]);
			}
#endif
			data_index = 0;
			handle_data(cir_data);
			return;
		}
		else if (data_index>16) {
			set_rx_active(cir);
#if 0
			printk("warning: data_index %d\n", data_index);
			for (j=0; j<=data_index; j++) {
				printk("rx_data %d:  %x\n", j, cir_data[j]);
			}
#endif
			data_index = 0;
			clear_fifo(cir);
			return;
		}
		data_index++;
	}
}


#define NUM_KBD_BYTES 5
static int handle_data(unsigned char *p_data)
{
	u_int32_t bit_bucket;
	u_int32_t i, j;
	u_int32_t got_bits, next_byte;
	int down = 0;

	/* Reorganize the bit stream */
	for (i=0; i<16; i++)
		p_data[i] = BitReverse(~p_data[i]);

	/* 
	 * We've already previously checked that p_data[0]
	 * is equal to leading1 and that (p_data[1] & 0xf)
	 * is equal to leading2. These twelve bits are the
	 * leader code.  We can now throw them away (the 12
	 * bits) and continue parsing the stream.
	 */
	bit_bucket = p_data[1] << 12;
	got_bits = 4;
	next_byte = 2;

	/* 
	 * Process four bits at a time
	 */
	for (i=0; i<NUM_KBD_BYTES; i++) {

		kbdbytes[i]=0;

		for (j=0; j<8; j++) /* 8 bits per byte */
		{
			if (got_bits < 4) {
				bit_bucket |= (p_data[next_byte++] << (8 - got_bits));
				got_bits += 8;
			}

			if ((bit_bucket & 0xF000) == 0x8000) { 
				/* Convert 1000b to 1 */
				kbdbytes[i] = 0x80 | (kbdbytes[i] >> 1);
				got_bits -= 4;
				bit_bucket = bit_bucket << 4;
			}
			else if ((bit_bucket & 0xC000) == 0x8000) {
				/* Convert 10b to 0 */
				kbdbytes[i] =  kbdbytes[i] >> 1;
				got_bits -= 2;
				bit_bucket = bit_bucket << 2;
			}
			else {
				/* bad serial stream */
				return 1;
			}

			if (next_byte > 16) {
				//printk("error: too many bytes\n");
				return 1;
			}
		}
	}


	if (!CheckSumOk(kbdbytes[0], kbdbytes[1], 
				kbdbytes[2], kbdbytes[3], kbdbytes[4])) {
		//printk("checksum failed\n");
		return 1;
	}

	if (kbdbytes[1] & 0x08) {
		//printk("m: %x %x %x\n", kbdbytes[1], kbdbytes[2], kbdbytes[3]);
		handle_mouse_event(kbdbytes[1]);
		handle_mouse_event(kbdbytes[2]);
		handle_mouse_event(kbdbytes[3]);
	}
	else {
		if (kbdbytes[2] == 0) down = 1;
#if 0
		if (down)
			printk("down %d\n", kbdbytes[3]);
		else
			printk("up %d\n", kbdbytes[3]);
#endif
		handle_keyboard_event(kbdbytes[3], down);
	}
	return 0;
}


DEFINE_SPINLOCK(kbd_controller_lock);
static unsigned char handle_kbd_event(void);


int kbd_setkeycode(unsigned int scancode, unsigned int keycode)
{
	printk("kbd_setkeycode scancode %x keycode %x\n", scancode, keycode);
	return 0;
}

int kbd_getkeycode(unsigned int scancode)
{
	return scancode;
}


int kbd_translate(unsigned char scancode, unsigned char *keycode,
		    char raw_mode)
{
	static int prev_scancode = 0;

	if (scancode == 0x00 || scancode == 0xff) {
		prev_scancode = 0;
		return 0;
	}

	/* todo */
	if (!prev_scancode && scancode == 160) { /* Fn key down */
		//printk("Fn key down\n");
		prev_scancode = 160;
		return 0;
	}
	else if (prev_scancode && scancode == 160) { /* Fn key up */
		//printk("Fn key up\n");
		prev_scancode = 0;
		return 0;
	}

	/* todo */
	if (prev_scancode == 160) {
		if (scancode <= NUM_FN_KEYS) {
			*keycode = fn_keys[scancode];
			//printk("fn keycode %d\n", *keycode);
		}
		else
			return 0;
	} 
	else if (scancode <= 127) {
		*keycode = scancode;
	}
	else
		return 0;


 	return 1;
}

char kbd_unexpected_up(unsigned char keycode)
{
	//printk("kbd_unexpected_up\n");
	return 0;
}

static unsigned char kbd_exists = 1;

static inline void handle_keyboard_event(unsigned char scancode, int down)
{
	kbd_exists = 1;
	handle_scancode(scancode, down);
	tasklet_schedule(&keyboard_tasklet);
}	


void kbd_leds(unsigned char leds)
{
}

/* dummy */
void kbd_init_hw(void)
{
}



static inline void handle_mouse_event(unsigned char scancode)
{
	if(scancode == AUX_RECONNECT){
		queue->head = queue->tail = 0;  /* Flush input queue */
	//	__aux_write_ack(AUX_ENABLE_DEV);  /* ping the mouse :) */
		return;
	}

	if (aux_count) {
		int head = queue->head;

		queue->buf[head] = scancode;
		head = (head + 1) & (AUX_BUF_SIZE-1);
		if (head != queue->tail) {
			queue->head = head;
			kill_fasync(&queue->fasync, SIGIO, POLL_IN);
			wake_up_interruptible(&queue->proc_list);
		}
	}
}

static unsigned char get_from_queue(void)
{
	unsigned char result;
	unsigned long flags;

	spin_lock_irqsave(&kbd_controller_lock, flags);
	result = queue->buf[queue->tail];
	queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1);
	spin_unlock_irqrestore(&kbd_controller_lock, flags);
	return result;
}


static inline int queue_empty(void)
{
	return queue->head == queue->tail;
}

static int fasync_aux(int fd, struct file *filp, int on)
{
	int retval;

	//printk("fasync_aux\n");
	retval = fasync_helper(fd, filp, on, &queue->fasync);
	if (retval < 0)
		return retval;
	return 0;
}


/*
 * Random magic cookie for the aux device
 */
#define AUX_DEV ((void *)queue)

static int release_aux(struct inode * inode, struct file * file)
{
	fasync_aux(-1, file, 0);
	aux_count--;
	return 0;
}

static int open_aux(struct inode * inode, struct file * file)
{
	if (aux_count++) {
		return 0;
	}
	queue->head = queue->tail = 0;		/* Flush input queue */
	return 0;
}

/*
 * Put bytes from input queue to buffer.
 */

static ssize_t read_aux(struct file * file, char * buffer,
			size_t count, loff_t *ppos)
{
	DECLARE_WAITQUEUE(wait, current);
	ssize_t i = count;
	unsigned char c;

	if (queue_empty()) {
		if (file->f_flags & O_NONBLOCK)
			return -EAGAIN;
		add_wait_queue(&queue->proc_list, &wait);
repeat:
		set_current_state(TASK_INTERRUPTIBLE);
		if (queue_empty() && !signal_pending(current)) {
			schedule();
			goto repeat;
		}
		current->state = TASK_RUNNING;
		remove_wait_queue(&queue->proc_list, &wait);
	}
	while (i > 0 && !queue_empty()) {
		c = get_from_queue();
		put_user(c, buffer++);
		i--;
	}
	if (count-i) {
		struct inode *inode = file->f_dentry->d_inode;
		inode->i_atime = current_fs_time(inode->i_sb);
		return count-i;
	}
	if (signal_pending(current))
		return -ERESTARTSYS;
	return 0;
}

/*
 * Write to the aux device.
 */

static ssize_t write_aux(struct file * file, const char * buffer,
			 size_t count, loff_t *ppos)
{
	/*
	 * The ITE boards this was tested on did not have the
	 * transmit wires connected.
	 */
	return count;
}

static unsigned int aux_poll(struct file *file, poll_table * wait)
{
	poll_wait(file, &queue->proc_list, wait);
	if (!queue_empty())
		return POLLIN | POLLRDNORM;
	return 0;
}

struct file_operations psaux_fops = {
	.read		= read_aux,
	.write		= write_aux,
	.poll		= aux_poll,
	.open		= open_aux,
	.release	= release_aux,
	.fasync		= fasync_aux,
};

/*
 * Initialize driver.
 */
static struct miscdevice psaux_mouse = {
	PSMOUSE_MINOR, "psaux", &psaux_fops
};

static int __init psaux_init(void)
{
	int retval;

	retval = misc_register(&psaux_mouse);
	if(retval < 0)
		return retval;

	queue = (struct aux_queue *) kmalloc(sizeof(*queue), GFP_KERNEL);
	if (!queue) {
		misc_deregister(&psaux_mouse);
		return -ENOMEM;
	}
		
	memset(queue, 0, sizeof(*queue));
	queue->head = queue->tail = 0;
	init_waitqueue_head(&queue->proc_list);

	return 0;
}
module_init(init_qtronix_990P_kbd);
#endif