summaryrefslogtreecommitdiffstats
path: root/common/usb_kbd.c
blob: 4efbcfe90d369fdc60028640c74efba05d3442b6 (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
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * Part of this source has been derived from the Linux USB
 * project.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 <common.h>
#include <malloc.h>
#include <stdio_dev.h>
#include <asm/byteorder.h>

#include <usb.h>

#ifdef	USB_KBD_DEBUG
#define USB_KBD_PRINTF(fmt, args...)	printf(fmt, ##args)
#else
#define USB_KBD_PRINTF(fmt, args...)
#endif

/*
 * If overwrite_console returns 1, the stdin, stderr and stdout
 * are switched to the serial port, else the settings in the
 * environment are used
 */
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#else
int overwrite_console(void)
{
	return 0;
}
#endif

/* Keyboard sampling rate */
#define REPEAT_RATE	(40 / 4)	/* 40msec -> 25cps */
#define REPEAT_DELAY	10		/* 10 x REPEAT_RATE = 400msec */

#define NUM_LOCK	0x53
#define CAPS_LOCK	0x39
#define SCROLL_LOCK	0x47

/* Modifier bits */
#define LEFT_CNTR	(1 << 0)
#define LEFT_SHIFT	(1 << 1)
#define LEFT_ALT	(1 << 2)
#define LEFT_GUI	(1 << 3)
#define RIGHT_CNTR	(1 << 4)
#define RIGHT_SHIFT	(1 << 5)
#define RIGHT_ALT	(1 << 6)
#define RIGHT_GUI	(1 << 7)

/* Size of the keyboard buffer */
#define USB_KBD_BUFFER_LEN	0x20

/* Device name */
#define DEVNAME			"usbkbd"

/* Keyboard maps */
static const unsigned char usb_kbd_numkey[] = {
	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
	'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
	'\\', '#', ';', '\'', '`', ',', '.', '/'
};
static const unsigned char usb_kbd_numkey_shifted[] = {
	'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
	'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
	'|', '~', ':', '"', '~', '<', '>', '?'
};

static const unsigned char usb_kbd_num_keypad[] = {
	'/', '*', '-', '+', '\r',
	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
	'.', 0, 0, 0, '='
};

/*
 * map arrow keys to ^F/^B ^N/^P, can't really use the proper
 * ANSI sequence for arrow keys because the queuing code breaks
 * when a single keypress expands to 3 queue elements
 */
static const unsigned char usb_kbd_arrow[] = {
	0x6, 0x2, 0xe, 0x10
};

/*
 * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
 *       order. See usb_kbd_setled() function!
 */
#define USB_KBD_NUMLOCK		(1 << 0)
#define USB_KBD_CAPSLOCK	(1 << 1)
#define USB_KBD_SCROLLLOCK	(1 << 2)
#define USB_KBD_CTRL		(1 << 3)

#define USB_KBD_LEDMASK		\
	(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)

struct usb_kbd_pdata {
	uint32_t	repeat_delay;

	uint32_t	usb_in_pointer;
	uint32_t	usb_out_pointer;
	uint8_t		usb_kbd_buffer[USB_KBD_BUFFER_LEN];

	uint8_t		*new;
	uint8_t		old[8];

	uint8_t		flags;
};

/* Generic keyboard event polling. */
void usb_kbd_generic_poll(void)
{
	struct stdio_dev *dev;
	struct usb_device *usb_kbd_dev;
	struct usb_kbd_pdata *data;
	struct usb_interface *iface;
	struct usb_endpoint_descriptor *ep;
	int pipe;
	int maxp;

	/* Get the pointer to USB Keyboard device pointer */
	dev = stdio_get_by_name(DEVNAME);
	usb_kbd_dev = (struct usb_device *)dev->priv;
	data = usb_kbd_dev->privptr;
	iface = &usb_kbd_dev->config.if_desc[0];
	ep = &iface->ep_desc[0];
	pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);

	/* Submit a interrupt transfer request */
	maxp = usb_maxpacket(usb_kbd_dev, pipe);
	usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
			maxp > 8 ? 8 : maxp, ep->bInterval);
}

/* Puts character in the queue and sets up the in and out pointer. */
static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
{
	if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
		/* Check for buffer full. */
		if (data->usb_out_pointer == 0)
			return;

		data->usb_in_pointer = 0;
	} else {
		/* Check for buffer full. */
		if (data->usb_in_pointer == data->usb_out_pointer - 1)
			return;

		data->usb_in_pointer++;
	}

	data->usb_kbd_buffer[data->usb_in_pointer] = c;
}

/*
 * Set the LEDs. Since this is used in the irq routine, the control job is
 * issued with a timeout of 0. This means, that the job is queued without
 * waiting for job completion.
 */
static void usb_kbd_setled(struct usb_device *dev)
{
	struct usb_interface *iface = &dev->config.if_desc[0];
	struct usb_kbd_pdata *data = dev->privptr;
	uint32_t leds = data->flags & USB_KBD_LEDMASK;

	usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
}

#define CAPITAL_MASK	0x20
/* Translate the scancode in ASCII */
static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
				unsigned char modifier, int pressed)
{
	uint8_t keycode = 0;

	/* Key released */
	if (pressed == 0) {
		data->repeat_delay = 0;
		return 0;
	}

	if (pressed == 2) {
		data->repeat_delay++;
		if (data->repeat_delay < REPEAT_DELAY)
			return 0;

		data->repeat_delay = REPEAT_DELAY;
	}

	/* Alphanumeric values */
	if ((scancode > 3) && (scancode <= 0x1d)) {
		keycode = scancode - 4 + 'a';

		if (data->flags & USB_KBD_CAPSLOCK)
			keycode &= ~CAPITAL_MASK;

		if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
			/* Handle CAPSLock + Shift pressed simultaneously */
			if (keycode & CAPITAL_MASK)
				keycode &= ~CAPITAL_MASK;
			else
				keycode |= CAPITAL_MASK;
		}
	}

	if ((scancode > 0x1d) && (scancode < 0x3a)) {
		/* Shift pressed */
		if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
			keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
		else
			keycode = usb_kbd_numkey[scancode - 0x1e];
	}

	/* Arrow keys */
	if ((scancode >= 0x4f) && (scancode <= 0x52))
		keycode = usb_kbd_arrow[scancode - 0x4f];

	/* Numeric keypad */
	if ((scancode >= 0x54) && (scancode <= 0x67))
		keycode = usb_kbd_num_keypad[scancode - 0x54];

	if (data->flags & USB_KBD_CTRL)
		keycode = scancode - 0x3;

	if (pressed == 1) {
		if (scancode == NUM_LOCK) {
			data->flags ^= USB_KBD_NUMLOCK;
			return 1;
		}

		if (scancode == CAPS_LOCK) {
			data->flags ^= USB_KBD_CAPSLOCK;
			return 1;
		}
		if (scancode == SCROLL_LOCK) {
			data->flags ^= USB_KBD_SCROLLLOCK;
			return 1;
		}
	}

	/* Report keycode if any */
	if (keycode) {
		USB_KBD_PRINTF("%c", keycode);
		usb_kbd_put_queue(data, keycode);
	}

	return 0;
}

static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
{
	uint32_t res = 0;
	struct usb_kbd_pdata *data = dev->privptr;
	uint8_t *new;
	uint8_t *old;

	if (up) {
		new = data->old;
		old = data->new;
	} else {
		new = data->new;
		old = data->old;
	}

	if ((old[i] > 3) && (memscan(new + 2, old[i], 6) == new + 8))
		res |= usb_kbd_translate(data, old[i], data->new[0], up);

	return res;
}

/* Interrupt service routine */
static int usb_kbd_irq_worker(struct usb_device *dev)
{
	struct usb_kbd_pdata *data = dev->privptr;
	int i, res = 0;

	/* No combo key pressed */
	if (data->new[0] == 0x00)
		data->flags &= ~USB_KBD_CTRL;
	/* Left or Right Ctrl pressed */
	else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
		data->flags |= USB_KBD_CTRL;

	for (i = 2; i < 8; i++) {
		res |= usb_kbd_service_key(dev, i, 0);
		res |= usb_kbd_service_key(dev, i, 1);
	}

	/* Key is still pressed */
	if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
		res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);

	if (res == 1)
		usb_kbd_setled(dev);

	memcpy(data->old, data->new, 8);

	return 1;
}

/* Keyboard interrupt handler */
static int usb_kbd_irq(struct usb_device *dev)
{
	if ((dev->irq_status != 0) || (dev->irq_act_len != 8)) {
		USB_KBD_PRINTF("USB KBD: Error %lX, len %d\n",
				dev->irq_status, dev->irq_act_len);
		return 1;
	}

	return usb_kbd_irq_worker(dev);
}

/* Interrupt polling */
static inline void usb_kbd_poll_for_event(struct usb_device *dev)
{
#if	defined(CONFIG_SYS_USB_EVENT_POLL)
	struct usb_interface *iface;
	struct usb_endpoint_descriptor *ep;
	struct usb_kbd_pdata *data;
	int pipe;
	int maxp;

	/* Get the pointer to USB Keyboard device pointer */
	data = dev->privptr;
	iface = &dev->config.if_desc[0];
	ep = &iface->ep_desc[0];
	pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);

	/* Submit a interrupt transfer request */
	maxp = usb_maxpacket(dev, pipe);
	usb_submit_int_msg(dev, pipe, &data->new[0],
			maxp > 8 ? 8 : maxp, ep->bInterval);

	usb_kbd_irq_worker(dev);
#elif	defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
	struct usb_interface *iface;
	struct usb_kbd_pdata *data = dev->privptr;
	iface = &dev->config.if_desc[0];
	usb_get_report(dev, iface->desc.bInterfaceNumber,
			1, 0, data->new, sizeof(data->new));
	if (memcmp(data->old, data->new, sizeof(data->new)))
		usb_kbd_irq_worker(dev);
#endif
}

/* test if a character is in the queue */
static int usb_kbd_testc(void)
{
	struct stdio_dev *dev;
	struct usb_device *usb_kbd_dev;
	struct usb_kbd_pdata *data;

	dev = stdio_get_by_name(DEVNAME);
	usb_kbd_dev = (struct usb_device *)dev->priv;
	data = usb_kbd_dev->privptr;

	usb_kbd_poll_for_event(usb_kbd_dev);

	return !(data->usb_in_pointer == data->usb_out_pointer);
}

/* gets the character from the queue */
static int usb_kbd_getc(void)
{
	struct stdio_dev *dev;
	struct usb_device *usb_kbd_dev;
	struct usb_kbd_pdata *data;

	dev = stdio_get_by_name(DEVNAME);
	usb_kbd_dev = (struct usb_device *)dev->priv;
	data = usb_kbd_dev->privptr;

	while (data->usb_in_pointer == data->usb_out_pointer)
		usb_kbd_poll_for_event(usb_kbd_dev);

	if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
		data->usb_out_pointer = 0;
	else
		data->usb_out_pointer++;

	return data->usb_kbd_buffer[data->usb_out_pointer];
}

/* probes the USB device dev for keyboard type. */
static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
{
	struct usb_interface *iface;
	struct usb_endpoint_descriptor *ep;
	struct usb_kbd_pdata *data;
	int pipe, maxp;

	if (dev->descriptor.bNumConfigurations != 1)
		return 0;

	iface = &dev->config.if_desc[ifnum];

	if (iface->desc.bInterfaceClass != 3)
		return 0;

	if (iface->desc.bInterfaceSubClass != 1)
		return 0;

	if (iface->desc.bInterfaceProtocol != 1)
		return 0;

	if (iface->desc.bNumEndpoints != 1)
		return 0;

	ep = &iface->ep_desc[0];

	/* Check if endpoint 1 is interrupt endpoint */
	if (!(ep->bEndpointAddress & 0x80))
		return 0;

	if ((ep->bmAttributes & 3) != 3)
		return 0;

	USB_KBD_PRINTF("USB KBD: found set protocol...\n");

	data = malloc(sizeof(struct usb_kbd_pdata));
	if (!data) {
		printf("USB KBD: Error allocating private data\n");
		return 0;
	}

	/* Clear private data */
	memset(data, 0, sizeof(struct usb_kbd_pdata));

	/* allocate input buffer aligned and sized to USB DMA alignment */
	data->new = memalign(USB_DMA_MINALIGN, roundup(8, USB_DMA_MINALIGN));

	/* Insert private data into USB device structure */
	dev->privptr = data;

	/* Set IRQ handler */
	dev->irq_handle = usb_kbd_irq;

	pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
	maxp = usb_maxpacket(dev, pipe);

	/* We found a USB Keyboard, install it. */
	usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);

	USB_KBD_PRINTF("USB KBD: found set idle...\n");
	usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);

	USB_KBD_PRINTF("USB KBD: enable interrupt pipe...\n");
	usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
				ep->bInterval);

	/* Success. */
	return 1;
}

/* Search for keyboard and register it if found. */
int drv_usb_kbd_init(void)
{
	struct stdio_dev usb_kbd_dev, *old_dev;
	struct usb_device *dev;
	char *stdinname = getenv("stdin");
	int error, i;

	/* Scan all USB Devices */
	for (i = 0; i < USB_MAX_DEVICE; i++) {
		/* Get USB device. */
		dev = usb_get_dev_index(i);
		if (!dev)
			return -1;

		if (dev->devnum == -1)
			continue;

		/* Try probing the keyboard */
		if (usb_kbd_probe(dev, 0) != 1)
			continue;

		/* We found a keyboard, check if it is already registered. */
		USB_KBD_PRINTF("USB KBD: found set up device.\n");
		old_dev = stdio_get_by_name(DEVNAME);
		if (old_dev) {
			/* Already registered, just return ok. */
			USB_KBD_PRINTF("USB KBD: is already registered.\n");
			return 1;
		}

		/* Register the keyboard */
		USB_KBD_PRINTF("USB KBD: register.\n");
		memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
		strcpy(usb_kbd_dev.name, DEVNAME);
		usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
		usb_kbd_dev.putc = NULL;
		usb_kbd_dev.puts = NULL;
		usb_kbd_dev.getc = usb_kbd_getc;
		usb_kbd_dev.tstc = usb_kbd_testc;
		usb_kbd_dev.priv = (void *)dev;
		error = stdio_register(&usb_kbd_dev);
		if (error)
			return error;

#ifdef CONFIG_CONSOLE_MUX
		error = iomux_doenv(stdin, stdinname);
		if (error)
			return error;
#else
		/* Check if this is the standard input device. */
		if (strcmp(stdinname, DEVNAME))
			return 1;

		/* Reassign the console */
		if (overwrite_console())
			return 1;

		error = console_assign(stdin, DEVNAME);
		if (error)
			return error;
#endif

		return 1;
	}

	/* No USB Keyboard found */
	return -1;
}

/* Deregister the keyboard. */
int usb_kbd_deregister(void)
{
#ifdef CONFIG_SYS_STDIO_DEREGISTER
	return stdio_deregister(DEVNAME);
#else
	return 1;
#endif
}
OpenPOWER on IntegriCloud