summaryrefslogtreecommitdiffstats
path: root/drivers/media/rc/ir_toy.c
blob: 69e630d85262f65f413ee8c9d092ea85cee01c91 (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
// SPDX-License-Identifier: GPL-2.0-or-later

/*
 * Infrared Toy and IR Droid RC core driver
 *
 * Copyright (C) 2020 Sean Young <sean@mess.org>
 *
 * http://dangerousprototypes.com/docs/USB_IR_Toy:_Sampling_mode
 *
 * This driver is based on the lirc driver which can be found here:
 * https://sourceforge.net/p/lirc/git/ci/master/tree/plugins/irtoy.c
 * Copyright (C) 2011 Peter Kooiman <pkooiman@gmail.com>
 */

#include <asm/unaligned.h>
#include <linux/completion.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/usb/input.h>

#include <media/rc-core.h>

static const u8 COMMAND_VERSION[] = { 'v' };
// End transmit and repeat reset command so we exit sump mode
static const u8 COMMAND_RESET[] = { 0xff, 0xff, 0, 0, 0, 0, 0 };
static const u8 COMMAND_SMODE_ENTER[] = { 's' };
static const u8 COMMAND_SMODE_EXIT[] = { 0 };
static const u8 COMMAND_TXSTART[] = { 0x26, 0x24, 0x25, 0x03 };

#define REPLY_XMITCOUNT 't'
#define REPLY_XMITSUCCESS 'C'
#define REPLY_VERSION 'V'
#define REPLY_SAMPLEMODEPROTO 'S'

#define TIMEOUT 500

#define LEN_XMITRES 3
#define LEN_VERSION 4
#define LEN_SAMPLEMODEPROTO 3

#define MIN_FW_VERSION 20
#define UNIT_US 21
#define MAX_TIMEOUT_US (UNIT_US * U16_MAX)

#define MAX_PACKET 64

enum state {
	STATE_IRDATA,
	STATE_COMMAND_NO_RESP,
	STATE_COMMAND,
	STATE_TX,
};

struct irtoy {
	struct device *dev;
	struct usb_device *usbdev;

	struct rc_dev *rc;
	struct urb *urb_in, *urb_out;

	u8 *in;
	u8 *out;
	struct completion command_done;

	bool pulse;
	enum state state;

	void *tx_buf;
	uint tx_len;

	uint emitted;
	uint hw_version;
	uint sw_version;
	uint proto_version;

	char phys[64];
};

static void irtoy_response(struct irtoy *irtoy, u32 len)
{
	switch (irtoy->state) {
	case STATE_COMMAND:
		if (len == LEN_VERSION && irtoy->in[0] == REPLY_VERSION) {
			uint version;

			irtoy->in[LEN_VERSION] = 0;

			if (kstrtouint(irtoy->in + 1, 10, &version)) {
				dev_err(irtoy->dev, "invalid version %*phN. Please make sure you are using firmware v20 or higher",
					LEN_VERSION, irtoy->in);
				break;
			}

			dev_dbg(irtoy->dev, "version %s\n", irtoy->in);

			irtoy->hw_version = version / 100;
			irtoy->sw_version = version % 100;

			irtoy->state = STATE_IRDATA;
			complete(&irtoy->command_done);
		} else if (len == LEN_SAMPLEMODEPROTO &&
			   irtoy->in[0] == REPLY_SAMPLEMODEPROTO) {
			uint version;

			irtoy->in[LEN_SAMPLEMODEPROTO] = 0;

			if (kstrtouint(irtoy->in + 1, 10, &version)) {
				dev_err(irtoy->dev, "invalid sample mode response %*phN",
					LEN_SAMPLEMODEPROTO, irtoy->in);
				return;
			}

			dev_dbg(irtoy->dev, "protocol %s\n", irtoy->in);

			irtoy->proto_version = version;

			irtoy->state = STATE_IRDATA;
			complete(&irtoy->command_done);
		} else {
			dev_err(irtoy->dev, "unexpected response to command: %*phN\n",
				len, irtoy->in);
		}
		break;
	case STATE_COMMAND_NO_RESP:
	case STATE_IRDATA: {
		struct ir_raw_event rawir = { .pulse = irtoy->pulse };
		__be16 *in = (__be16 *)irtoy->in;
		int i;

		for (i = 0; i < len / sizeof(__be16); i++) {
			u16 v = be16_to_cpu(in[i]);

			if (v == 0xffff) {
				rawir.pulse = false;
			} else {
				rawir.duration = v * UNIT_US;
				ir_raw_event_store_with_timeout(irtoy->rc,
								&rawir);
			}

			rawir.pulse = !rawir.pulse;
		}

		irtoy->pulse = rawir.pulse;

		ir_raw_event_handle(irtoy->rc);
		break;
	}
	case STATE_TX:
		if (irtoy->tx_len == 0) {
			if (len == LEN_XMITRES &&
			    irtoy->in[0] == REPLY_XMITCOUNT) {
				u16 emitted = get_unaligned_be16(irtoy->in + 1);

				dev_dbg(irtoy->dev, "emitted:%u\n", emitted);

				irtoy->emitted = emitted;
			} else if (len == 1 &&
				   irtoy->in[0] == REPLY_XMITSUCCESS) {
				irtoy->state = STATE_IRDATA;
				complete(&irtoy->command_done);
			}
		} else {
			// send next part of tx buffer
			uint space = irtoy->in[0];
			uint buf_len;
			int err;

			if (len != 1 || space > MAX_PACKET || space == 0) {
				dev_dbg(irtoy->dev, "packet length expected: %*phN\n",
					len, irtoy->in);
				break;
			}

			buf_len = min(space, irtoy->tx_len);

			dev_dbg(irtoy->dev, "remaining:%u sending:%u\n",
				irtoy->tx_len, buf_len);

			memcpy(irtoy->out, irtoy->tx_buf, buf_len);
			irtoy->urb_out->transfer_buffer_length = buf_len;
			err = usb_submit_urb(irtoy->urb_out, GFP_ATOMIC);
			if (err != 0) {
				dev_err(irtoy->dev, "fail to submit tx buf urb: %d\n",
					err);
				irtoy->state = STATE_IRDATA;
				complete(&irtoy->command_done);
				break;
			}

			irtoy->tx_buf += buf_len;
			irtoy->tx_len -= buf_len;
		}
		break;
	}
}

static void irtoy_out_callback(struct urb *urb)
{
	struct irtoy *irtoy = urb->context;

	if (urb->status == 0) {
		if (irtoy->state == STATE_COMMAND_NO_RESP)
			complete(&irtoy->command_done);
	} else {
		dev_warn(irtoy->dev, "out urb status: %d\n", urb->status);
	}
}

static void irtoy_in_callback(struct urb *urb)
{
	struct irtoy *irtoy = urb->context;
	int ret;

	switch (urb->status) {
	case 0:
		irtoy_response(irtoy, urb->actual_length);
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	case -EPROTO:
	case -EPIPE:
		usb_unlink_urb(urb);
		return;
	default:
		dev_dbg(irtoy->dev, "in urb status: %d\n", urb->status);
	}

	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret && ret != -ENODEV)
		dev_warn(irtoy->dev, "failed to resubmit urb: %d\n", ret);
}

static int irtoy_command(struct irtoy *irtoy, const u8 *cmd, int cmd_len,
			 enum state state)
{
	int err;

	init_completion(&irtoy->command_done);

	irtoy->state = state;

	memcpy(irtoy->out, cmd, cmd_len);
	irtoy->urb_out->transfer_buffer_length = cmd_len;

	err = usb_submit_urb(irtoy->urb_out, GFP_KERNEL);
	if (err != 0)
		return err;

	if (!wait_for_completion_timeout(&irtoy->command_done,
					 msecs_to_jiffies(TIMEOUT))) {
		usb_kill_urb(irtoy->urb_out);
		return -ETIMEDOUT;
	}

	return 0;
}

static int irtoy_setup(struct irtoy *irtoy)
{
	int err;

	err = irtoy_command(irtoy, COMMAND_RESET, sizeof(COMMAND_RESET),
			    STATE_COMMAND_NO_RESP);
	if (err != 0) {
		dev_err(irtoy->dev, "could not write reset command: %d\n",
			err);
		return err;
	}

	usleep_range(50, 50);

	// get version
	err = irtoy_command(irtoy, COMMAND_VERSION, sizeof(COMMAND_VERSION),
			    STATE_COMMAND);
	if (err) {
		dev_err(irtoy->dev, "could not write version command: %d\n",
			err);
		return err;
	}

	// enter sample mode
	err = irtoy_command(irtoy, COMMAND_SMODE_ENTER,
			    sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND);
	if (err)
		dev_err(irtoy->dev, "could not write sample command: %d\n",
			err);

	return err;
}

/*
 * When sending IR, it is imperative that we send the IR data as quickly
 * as possible to the device, so it does not run out of IR data and
 * introduce gaps. Allocate the buffer here, and then feed the data from
 * the urb callback handler.
 */
static int irtoy_tx(struct rc_dev *rc, uint *txbuf, uint count)
{
	struct irtoy *irtoy = rc->priv;
	unsigned int i, size;
	__be16 *buf;
	int err;

	size = sizeof(u16) * (count + 1);
	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	for (i = 0; i < count; i++) {
		u16 v = DIV_ROUND_CLOSEST(txbuf[i], UNIT_US);

		if (!v)
			v = 1;
		buf[i] = cpu_to_be16(v);
	}

	buf[count] = cpu_to_be16(0xffff);

	irtoy->tx_buf = buf;
	irtoy->tx_len = size;
	irtoy->emitted = 0;

	// There is an issue where if the unit is receiving IR while the
	// first TXSTART command is sent, the device might end up hanging
	// with its led on. It does not respond to any command when this
	// happens. To work around this, re-enter sample mode.
	err = irtoy_command(irtoy, COMMAND_SMODE_EXIT,
			    sizeof(COMMAND_SMODE_EXIT), STATE_COMMAND_NO_RESP);
	if (err) {
		dev_err(irtoy->dev, "exit sample mode: %d\n", err);
		kfree(buf);
		return err;
	}

	err = irtoy_command(irtoy, COMMAND_SMODE_ENTER,
			    sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND);
	if (err) {
		dev_err(irtoy->dev, "enter sample mode: %d\n", err);
		kfree(buf);
		return err;
	}

	err = irtoy_command(irtoy, COMMAND_TXSTART, sizeof(COMMAND_TXSTART),
			    STATE_TX);
	kfree(buf);

	if (err) {
		dev_err(irtoy->dev, "failed to send tx start command: %d\n",
			err);
		// not sure what state the device is in, reset it
		irtoy_setup(irtoy);
		return err;
	}

	if (size != irtoy->emitted) {
		dev_err(irtoy->dev, "expected %u emitted, got %u\n", size,
			irtoy->emitted);
		// not sure what state the device is in, reset it
		irtoy_setup(irtoy);
		return -EINVAL;
	}

	return count;
}

static int irtoy_tx_carrier(struct rc_dev *rc, uint32_t carrier)
{
	struct irtoy *irtoy = rc->priv;
	u8 buf[3];
	int err;

	if (carrier < 11800)
		return -EINVAL;

	buf[0] = 0x06;
	buf[1] = DIV_ROUND_CLOSEST(48000000, 16 * carrier) - 1;
	buf[2] = 0;

	err = irtoy_command(irtoy, buf, sizeof(buf), STATE_COMMAND_NO_RESP);
	if (err)
		dev_err(irtoy->dev, "could not write carrier command: %d\n",
			err);

	return err;
}

static int irtoy_probe(struct usb_interface *intf,
		       const struct usb_device_id *id)
{
	struct usb_host_interface *idesc = intf->cur_altsetting;
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *ep_in = NULL;
	struct usb_endpoint_descriptor *ep_out = NULL;
	struct usb_endpoint_descriptor *ep = NULL;
	struct irtoy *irtoy;
	struct rc_dev *rc;
	struct urb *urb;
	int i, pipe, err = -ENOMEM;

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

		if (!ep_in && usb_endpoint_is_bulk_in(ep) &&
		    usb_endpoint_maxp(ep) == MAX_PACKET)
			ep_in = ep;

		if (!ep_out && usb_endpoint_is_bulk_out(ep) &&
		    usb_endpoint_maxp(ep) == MAX_PACKET)
			ep_out = ep;
	}

	if (!ep_in || !ep_out) {
		dev_err(&intf->dev, "required endpoints not found\n");
		return -ENODEV;
	}

	irtoy = kzalloc(sizeof(*irtoy), GFP_KERNEL);
	if (!irtoy)
		return -ENOMEM;

	irtoy->in = kmalloc(MAX_PACKET,  GFP_KERNEL);
	if (!irtoy->in)
		goto free_irtoy;

	irtoy->out = kmalloc(MAX_PACKET,  GFP_KERNEL);
	if (!irtoy->out)
		goto free_irtoy;

	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
	if (!rc)
		goto free_irtoy;

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb)
		goto free_rcdev;

	pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress);
	usb_fill_bulk_urb(urb, usbdev, pipe, irtoy->in, MAX_PACKET,
			  irtoy_in_callback, irtoy);
	irtoy->urb_in = urb;

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb)
		goto free_rcdev;

	pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress);
	usb_fill_bulk_urb(urb, usbdev, pipe, irtoy->out, MAX_PACKET,
			  irtoy_out_callback, irtoy);

	irtoy->dev = &intf->dev;
	irtoy->usbdev = usbdev;
	irtoy->rc = rc;
	irtoy->urb_out = urb;
	irtoy->pulse = true;

	err = usb_submit_urb(irtoy->urb_in, GFP_KERNEL);
	if (err != 0) {
		dev_err(irtoy->dev, "fail to submit in urb: %d\n", err);
		goto free_rcdev;
	}

	err = irtoy_setup(irtoy);
	if (err)
		goto free_rcdev;

	dev_info(irtoy->dev, "version: hardware %u, firmware %u.%u, protocol %u",
		 irtoy->hw_version, irtoy->sw_version / 10,
		 irtoy->sw_version % 10, irtoy->proto_version);

	if (irtoy->sw_version < MIN_FW_VERSION) {
		dev_err(irtoy->dev, "need firmware V%02u or higher",
			MIN_FW_VERSION);
		err = -ENODEV;
		goto free_rcdev;
	}

	usb_make_path(usbdev, irtoy->phys, sizeof(irtoy->phys));

	rc->device_name = "Infrared Toy";
	rc->driver_name = KBUILD_MODNAME;
	rc->input_phys = irtoy->phys;
	usb_to_input_id(usbdev, &rc->input_id);
	rc->dev.parent = &intf->dev;
	rc->priv = irtoy;
	rc->tx_ir = irtoy_tx;
	rc->s_tx_carrier = irtoy_tx_carrier;
	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
	rc->map_name = RC_MAP_RC6_MCE;
	rc->rx_resolution = UNIT_US;
	rc->timeout = IR_DEFAULT_TIMEOUT;

	/*
	 * end of transmission is detected by absence of a usb packet
	 * with more pulse/spaces. However, each usb packet sent can
	 * contain 32 pulse/spaces, which can be quite lengthy, so there
	 * can be a delay between usb packets. For example with nec there is a
	 * 17ms gap between packets.
	 *
	 * So, make timeout a largish minimum which works with most protocols.
	 */
	rc->min_timeout = MS_TO_US(40);
	rc->max_timeout = MAX_TIMEOUT_US;

	err = rc_register_device(rc);
	if (err)
		goto free_rcdev;

	usb_set_intfdata(intf, irtoy);

	return 0;

free_rcdev:
	usb_kill_urb(irtoy->urb_out);
	usb_free_urb(irtoy->urb_out);
	usb_kill_urb(irtoy->urb_in);
	usb_free_urb(irtoy->urb_in);
	rc_free_device(rc);
free_irtoy:
	kfree(irtoy->in);
	kfree(irtoy->out);
	kfree(irtoy);
	return err;
}

static void irtoy_disconnect(struct usb_interface *intf)
{
	struct irtoy *ir = usb_get_intfdata(intf);

	rc_unregister_device(ir->rc);
	usb_set_intfdata(intf, NULL);
	usb_kill_urb(ir->urb_out);
	usb_free_urb(ir->urb_out);
	usb_kill_urb(ir->urb_in);
	usb_free_urb(ir->urb_in);
	kfree(ir->in);
	kfree(ir->out);
	kfree(ir);
}

static const struct usb_device_id irtoy_table[] = {
	{ USB_DEVICE_INTERFACE_CLASS(0x04d8, 0xfd08, USB_CLASS_CDC_DATA) },
	{ USB_DEVICE_INTERFACE_CLASS(0x04d8, 0xf58b, USB_CLASS_CDC_DATA) },
	{ }
};

static struct usb_driver irtoy_driver = {
	.name = KBUILD_MODNAME,
	.probe = irtoy_probe,
	.disconnect = irtoy_disconnect,
	.id_table = irtoy_table,
};

module_usb_driver(irtoy_driver);

MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_DESCRIPTION("Infrared Toy and IR Droid driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, irtoy_table);