aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/keyspan_remote.c
blob: a93c525475c6e3945eb9cdc2d5a0db4203c8fb69 (plain) (blame)
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
606
607
/*
 * keyspan_remote: USB driver for the Keyspan DMR
 *
 * Copyright (C) 2005 Zymeta Corporation - Michael Downey (downey@zymeta.com)
 *
 *	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, version 2.
 *
 * This driver has been put together with the support of Innosys, Inc.
 * and Keyspan, Inc the manufacturers of the Keyspan USB DMR product.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb/input.h>

#define DRIVER_VERSION	"v0.1"
#define DRIVER_AUTHOR	"Michael Downey <downey@zymeta.com>"
#define DRIVER_DESC	"Driver for the USB Keyspan remote control."
#define DRIVER_LICENSE	"GPL"

/* Parameters that can be passed to the driver. */
static int debug;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Enable extra debug messages and information");

/* Vendor and product ids */
#define USB_KEYSPAN_VENDOR_ID		0x06CD
#define USB_KEYSPAN_PRODUCT_UIA11	0x0202

/* Defines for converting the data from the remote. */
#define ZERO		0x18
#define ZERO_MASK	0x1F	/* 5 bits for a 0 */
#define ONE		0x3C
#define ONE_MASK	0x3F	/* 6 bits for a 1 */
#define SYNC		0x3F80
#define SYNC_MASK	0x3FFF	/* 14 bits for a SYNC sequence */
#define STOP		0x00
#define STOP_MASK	0x1F	/* 5 bits for the STOP sequence */
#define GAP		0xFF

#define RECV_SIZE	8	/* The UIA-11 type have a 8 byte limit. */

/*
 * Table that maps the 31 possible keycodes to input keys.
 * Currently there are 15 and 17 button models so RESERVED codes
 * are blank areas in the mapping.
 */
static const unsigned short keyspan_key_table[] = {
	KEY_RESERVED,		/* 0 is just a place holder. */
	KEY_RESERVED,
	KEY_STOP,
	KEY_PLAYCD,
	KEY_RESERVED,
	KEY_PREVIOUSSONG,
	KEY_REWIND,
	KEY_FORWARD,
	KEY_NEXTSONG,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_PAUSE,
	KEY_VOLUMEUP,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_VOLUMEDOWN,
	KEY_RESERVED,
	KEY_UP,
	KEY_RESERVED,
	KEY_MUTE,
	KEY_LEFT,
	KEY_ENTER,
	KEY_RIGHT,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_DOWN,
	KEY_RESERVED,
	KEY_KPASTERISK,
	KEY_RESERVED,
	KEY_MENU
};

/* table of devices that work with this driver */
static struct usb_device_id keyspan_table[] = {
	{ USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
	{ }					/* Terminating entry */
};

/* Structure to store all the real stuff that a remote sends to us. */
struct keyspan_message {
	u16	system;
	u8	button;
	u8	toggle;
};

/* Structure used for all the bit testing magic needed to be done. */
struct bit_tester {
	u32	tester;
	int	len;
	int	pos;
	int	bits_left;
	u8	buffer[32];
};

/* Structure to hold all of our driver specific stuff */
struct usb_keyspan {
	char				name[128];
	char				phys[64];
	unsigned short			keymap[ARRAY_SIZE(keyspan_key_table)];
	struct usb_device		*udev;
	struct input_dev		*input;
	struct usb_interface		*interface;
	struct usb_endpoint_descriptor	*in_endpoint;
	struct urb*			irq_urb;
	int				open;
	dma_addr_t			in_dma;
	unsigned char			*in_buffer;

	/* variables used to parse messages from remote. */
	struct bit_tester		data;
	int				stage;
	int				toggle;
};

static struct usb_driver keyspan_driver;

/*
 * Debug routine that prints out what we've received from the remote.
 */
static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/
{
	char codes[4 * RECV_SIZE];
	int i;

	for (i = 0; i < RECV_SIZE; i++)
		snprintf(codes + i * 3, 4, "%02x ", dev->in_buffer[i]);

	dev_info(&dev->udev->dev, "%s\n", codes);
}

/*
 * Routine that manages the bit_tester structure.  It makes sure that there are
 * at least bits_needed bits loaded into the tester.
 */
static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed)
{
	if (dev->data.bits_left >= bits_needed)
		return 0;

	/*
	 * Somehow we've missed the last message. The message will be repeated
	 * though so it's not too big a deal
	 */
	if (dev->data.pos >= dev->data.len) {
		dev_dbg(&dev->udev->dev,
			"%s - Error ran out of data. pos: %d, len: %d\n",
			__func__, dev->data.pos, dev->data.len);
		return -1;
	}

	/* Load as much as we can into the tester. */
	while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) &&
	       (dev->data.pos < dev->data.len)) {
		dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left);
		dev->data.bits_left += 8;
	}

	return 0;
}

static void keyspan_report_button(struct usb_keyspan *remote, int button, int press)
{
	struct input_dev *input = remote->input;

	input_event(input, EV_MSC, MSC_SCAN, button);
	input_report_key(input, remote->keymap[button], press);
	input_sync(input);
}

/*
 * Routine that handles all the logic needed to parse out the message from the remote.
 */
static void keyspan_check_data(struct usb_keyspan *remote)
{
	int i;
	int found = 0;
	struct keyspan_message message;

	switch(remote->stage) {
	case 0:
		/*
		 * In stage 0 we want to find the start of a message.  The remote sends a 0xFF as filler.
		 * So the first byte that isn't a FF should be the start of a new message.
		 */
		for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);

		if (i < RECV_SIZE) {
			memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
			remote->data.len = RECV_SIZE;
			remote->data.pos = 0;
			remote->data.tester = 0;
			remote->data.bits_left = 0;
			remote->stage = 1;
		}
		break;

	case 1:
		/*
		 * Stage 1 we should have 16 bytes and should be able to detect a
		 * SYNC.  The SYNC is 14 bits, 7 0's and then 7 1's.
		 */
		memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
		remote->data.len += RECV_SIZE;

		found = 0;
		while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
			for (i = 0; i < 8; ++i) {
				if (keyspan_load_tester(remote, 14) != 0) {
					remote->stage = 0;
					return;
				}

				if ((remote->data.tester & SYNC_MASK) == SYNC) {
					remote->data.tester = remote->data.tester >> 14;
					remote->data.bits_left -= 14;
					found = 1;
					break;
				} else {
					remote->data.tester = remote->data.tester >> 1;
					--remote->data.bits_left;
				}
			}
		}

		if (!found) {
			remote->stage = 0;
			remote->data.len = 0;
		} else {
			remote->stage = 2;
		}
		break;

	case 2:
		/*
		 * Stage 2 we should have 24 bytes which will be enough for a full
		 * message.  We need to parse out the system code, button code,
		 * toggle code, and stop.
		 */
		memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
		remote->data.len += RECV_SIZE;

		message.system = 0;
		for (i = 0; i < 9; i++) {
			keyspan_load_tester(remote, 6);

			if ((remote->data.tester & ZERO_MASK) == ZERO) {
				message.system = message.system << 1;
				remote->data.tester = remote->data.tester >> 5;
				remote->data.bits_left -= 5;
			} else if ((remote->data.tester & ONE_MASK) == ONE) {
				message.system = (message.system << 1) + 1;
				remote->data.tester = remote->data.tester >> 6;
				remote->data.bits_left -= 6;
			} else {
				err("%s - Unknown sequence found in system data.\n", __func__);
				remote->stage = 0;
				return;
			}
		}

		message.button = 0;
		for (i = 0; i < 5; i++) {
			keyspan_load_tester(remote, 6);

			if ((remote->data.tester & ZERO_MASK) == ZERO) {
				message.button = message.button << 1;
				remote->data.tester = remote->data.tester >> 5;
				remote->data.bits_left -= 5;
			} else if ((remote->data.tester & ONE_MASK) == ONE) {
				message.button = (message.button << 1) + 1;
				remote->data.tester = remote->data.tester >> 6;
				remote->data.bits_left -= 6;
			} else {
				err("%s - Unknown sequence found in button data.\n", __func__);
				remote->stage = 0;
				return;
			}
		}

		keyspan_load_tester(remote, 6);
		if ((remote->data.tester & ZERO_MASK) == ZERO) {
			message.toggle = 0;
			remote->data.tester = remote->data.tester >> 5;
			remote->data.bits_left -= 5;
		} else if ((remote->data.tester & ONE_MASK) == ONE) {
			message.toggle = 1;
			remote->data.tester = remote->data.tester >> 6;
			remote->data.bits_left -= 6;
		} else {
			err("%s - Error in message, invalid toggle.\n", __func__);
			remote->stage = 0;
			return;
		}

		keyspan_load_tester(remote, 5);
		if ((remote->data.tester & STOP_MASK) == STOP) {
			remote->data.tester = remote->data.tester >> 5;
			remote->data.bits_left -= 5;
		} else {
			err("Bad message recieved, no stop bit found.\n");
		}

		dev_dbg(&remote->udev->dev,
			"%s found valid message: system: %d, button: %d, toggle: %d\n",
			__func__, message.system, message.button, message.toggle);

		if (message.toggle != remote->toggle) {
			keyspan_report_button(remote, message.button, 1);
			keyspan_report_button(remote, message.button, 0);
			remote->toggle = message.toggle;
		}

		remote->stage = 0;
		break;
	}
}

/*
 * Routine for sending all the initialization messages to the remote.
 */
static int keyspan_setup(struct usb_device* dev)
{
	int retval = 0;

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
			__func__, retval);
		return(retval);
	}

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
			__func__, retval);
		return(retval);
	}

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
			__func__, retval);
		return(retval);
	}

	dev_dbg(&dev->dev, "%s - Setup complete.\n", __func__);
	return(retval);
}

/*
 * Routine used to handle a new message that has come in.
 */
static void keyspan_irq_recv(struct urb *urb)
{
	struct usb_keyspan *dev = urb->context;
	int retval;

	/* Check our status in case we need to bail out early. */
	switch (urb->status) {
	case 0:
		break;

	/* Device went away so don't keep trying to read from it. */
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		return;

	default:
		goto resubmit;
		break;
	}

	if (debug)
		keyspan_print(dev);

	keyspan_check_data(dev);

resubmit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		err ("%s - usb_submit_urb failed with result: %d", __func__, retval);
}

static int keyspan_open(struct input_dev *dev)
{
	struct usb_keyspan *remote = input_get_drvdata(dev);

	remote->irq_urb->dev = remote->udev;
	if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void keyspan_close(struct input_dev *dev)
{
	struct usb_keyspan *remote = input_get_drvdata(dev);

	usb_kill_urb(remote->irq_urb);
}

static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
{

	struct usb_endpoint_descriptor *endpoint;
	int i;

	for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
		endpoint = &iface->endpoint[i].desc;

		if (usb_endpoint_is_int_in(endpoint)) {
			/* we found our interrupt in endpoint */
			return endpoint;
		}
	}

	return NULL;
}

/*
 * Routine that sets up the driver to handle a specific USB device detected on the bus.
 */
static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_endpoint_descriptor *endpoint;
	struct usb_keyspan *remote;
	struct input_dev *input_dev;
	int i, error;

	endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
	if (!endpoint)
		return -ENODEV;

	remote = kzalloc(sizeof(*remote), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!remote || !input_dev) {
		error = -ENOMEM;
		goto fail1;
	}

	remote->udev = udev;
	remote->input = input_dev;
	remote->interface = interface;
	remote->in_endpoint = endpoint;
	remote->toggle = -1;	/* Set to -1 so we will always not match the toggle from the first remote message. */

	remote->in_buffer = usb_alloc_coherent(udev, RECV_SIZE, GFP_ATOMIC, &remote->in_dma);
	if (!remote->in_buffer) {
		error = -ENOMEM;
		goto fail1;
	}

	remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!remote->irq_urb) {
		error = -ENOMEM;
		goto fail2;
	}

	error = keyspan_setup(udev);
	if (error) {
		error = -ENODEV;
		goto fail3;
	}

	if (udev->manufacturer)
		strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));

	if (udev->product) {
		if (udev->manufacturer)
			strlcat(remote->name, " ", sizeof(remote->name));
		strlcat(remote->name, udev->product, sizeof(remote->name));
	}

	if (!strlen(remote->name))
		snprintf(remote->name, sizeof(remote->name),
			 "USB Keyspan Remote %04x:%04x",
			 le16_to_cpu(udev->descriptor.idVendor),
			 le16_to_cpu(udev->descriptor.idProduct));

	usb_make_path(udev, remote->phys, sizeof(remote->phys));
	strlcat(remote->phys, "/input0", sizeof(remote->phys));
	memcpy(remote->keymap, keyspan_key_table, sizeof(remote->keymap));

	input_dev->name = remote->name;
	input_dev->phys = remote->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->dev.parent = &interface->dev;
	input_dev->keycode = remote->keymap;
	input_dev->keycodesize = sizeof(unsigned short);
	input_dev->keycodemax = ARRAY_SIZE(remote->keymap);

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	__set_bit(EV_KEY, input_dev->evbit);
	for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
		__set_bit(keyspan_key_table[i], input_dev->keybit);
	__clear_bit(KEY_RESERVED, input_dev->keybit);

	input_set_drvdata(input_dev, remote);

	input_dev->open = keyspan_open;
	input_dev->close = keyspan_close;

	/*
	 * Initialize the URB to access the device.
	 * The urb gets sent to the device in keyspan_open()
	 */
	usb_fill_int_urb(remote->irq_urb,
			 remote->udev,
			 usb_rcvintpipe(remote->udev, endpoint->bEndpointAddress),
			 remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
			 endpoint->bInterval);
	remote->irq_urb->transfer_dma = remote->in_dma;
	remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* we can register the device now, as it is ready */
	error = input_register_device(remote->input);
	if (error)
		goto fail3;

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, remote);

	return 0;

 fail3:	usb_free_urb(remote->irq_urb);
 fail2:	usb_free_coherent(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 fail1:	kfree(remote);
	input_free_device(input_dev);

	return error;
}

/*
 * Routine called when a device is disconnected from the USB.
 */
static void keyspan_disconnect(struct usb_interface *interface)
{
	struct usb_keyspan *remote;

	remote = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	if (remote) {	/* We have a valid driver structure so clean up everything we allocated. */
		input_unregister_device(remote->input);
		usb_kill_urb(remote->irq_urb);
		usb_free_urb(remote->irq_urb);
		usb_free_coherent(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
		kfree(remote);
	}
}

/*
 * Standard driver set up sections
 */
static struct usb_driver keyspan_driver =
{
	.name =		"keyspan_remote",
	.probe =	keyspan_probe,
	.disconnect =	keyspan_disconnect,
	.id_table =	keyspan_table
};

static int __init usb_keyspan_init(void)
{
	int result;

	/* register this driver with the USB subsystem */
	result = usb_register(&keyspan_driver);
	if (result)
		err("usb_register failed. Error number %d\n", result);

	return result;
}

static void __exit usb_keyspan_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&keyspan_driver);
}

module_init(usb_keyspan_init);
module_exit(usb_keyspan_exit);

MODULE_DEVICE_TABLE(usb, keyspan_table);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);