aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/rc/streamzap.c
blob: d7b11e6a998253dd362654ed468edcb11cfef103 (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
/*
 * Streamzap Remote Control driver
 *
 * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
 * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
 *
 * This driver was based on the work of Greg Wickham and Adrian
 * Dewhurst. It was substantially rewritten to support correct signal
 * gaps and now maintains a delay buffer, which is used to present
 * consistent timing behaviour to user space applications. Without the
 * delay buffer an ugly hack would be required in lircd, which can
 * cause sluggish signal decoding in certain situations.
 *
 * Ported to in-kernel ir-core interface by Jarod Wilson
 *
 * This driver is based on the USB skeleton driver packaged with the
 * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.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; 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/device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <media/rc-core.h>

#define DRIVER_VERSION	"1.61"
#define DRIVER_NAME	"streamzap"
#define DRIVER_DESC	"Streamzap Remote Control driver"

#ifdef CONFIG_USB_DEBUG
static bool debug = 1;
#else
static bool debug;
#endif

#define USB_STREAMZAP_VENDOR_ID		0x0e9c
#define USB_STREAMZAP_PRODUCT_ID	0x0000

/* table of devices that work with this driver */
static struct usb_device_id streamzap_table[] = {
	/* Streamzap Remote Control */
	{ USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
	/* Terminating entry */
	{ }
};

MODULE_DEVICE_TABLE(usb, streamzap_table);

#define SZ_PULSE_MASK 0xf0
#define SZ_SPACE_MASK 0x0f
#define SZ_TIMEOUT    0xff
#define SZ_RESOLUTION 256

/* number of samples buffered */
#define SZ_BUF_LEN 128

/* from ir-rc5-sz-decoder.c */
#ifdef CONFIG_IR_RC5_SZ_DECODER_MODULE
#define load_rc5_sz_decode()    request_module("ir-rc5-sz-decoder")
#else
#define load_rc5_sz_decode()    {}
#endif

enum StreamzapDecoderState {
	PulseSpace,
	FullPulse,
	FullSpace,
	IgnorePulse
};

/* structure to hold our device specific stuff */
struct streamzap_ir {
	/* ir-core */
	struct rc_dev *rdev;

	/* core device info */
	struct device *dev;

	/* usb */
	struct usb_device	*usbdev;
	struct usb_interface	*interface;
	struct usb_endpoint_descriptor *endpoint;
	struct urb		*urb_in;

	/* buffer & dma */
	unsigned char		*buf_in;
	dma_addr_t		dma_in;
	unsigned int		buf_in_len;

	/* track what state we're in */
	enum StreamzapDecoderState decoder_state;
	/* tracks whether we are currently receiving some signal */
	bool			idle;
	/* sum of signal lengths received since signal start */
	unsigned long		sum;
	/* start time of signal; necessary for gap tracking */
	struct timeval		signal_last;
	struct timeval		signal_start;
	bool			timeout_enabled;

	char			name[128];
	char			phys[64];
};


/* local function prototypes */
static int streamzap_probe(struct usb_interface *interface,
			   const struct usb_device_id *id);
static void streamzap_disconnect(struct usb_interface *interface);
static void streamzap_callback(struct urb *urb);
static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
static int streamzap_resume(struct usb_interface *intf);

/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver streamzap_driver = {
	.name =		DRIVER_NAME,
	.probe =	streamzap_probe,
	.disconnect =	streamzap_disconnect,
	.suspend =	streamzap_suspend,
	.resume =	streamzap_resume,
	.id_table =	streamzap_table,
};

static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
{
	dev_dbg(sz->dev, "Storing %s with duration %u us\n",
		(rawir.pulse ? "pulse" : "space"), rawir.duration);
	ir_raw_event_store_with_filter(sz->rdev, &rawir);
}

static void sz_push_full_pulse(struct streamzap_ir *sz,
			       unsigned char value)
{
	DEFINE_IR_RAW_EVENT(rawir);

	if (sz->idle) {
		long deltv;

		sz->signal_last = sz->signal_start;
		do_gettimeofday(&sz->signal_start);

		deltv = sz->signal_start.tv_sec - sz->signal_last.tv_sec;
		rawir.pulse = false;
		if (deltv > 15) {
			/* really long time */
			rawir.duration = IR_MAX_DURATION;
		} else {
			rawir.duration = (int)(deltv * 1000000 +
				sz->signal_start.tv_usec -
				sz->signal_last.tv_usec);
			rawir.duration -= sz->sum;
			rawir.duration = US_TO_NS(rawir.duration);
			rawir.duration &= IR_MAX_DURATION;
		}
		sz_push(sz, rawir);

		sz->idle = false;
		sz->sum = 0;
	}

	rawir.pulse = true;
	rawir.duration = ((int) value) * SZ_RESOLUTION;
	rawir.duration += SZ_RESOLUTION / 2;
	sz->sum += rawir.duration;
	rawir.duration = US_TO_NS(rawir.duration);
	rawir.duration &= IR_MAX_DURATION;
	sz_push(sz, rawir);
}

static void sz_push_half_pulse(struct streamzap_ir *sz,
			       unsigned char value)
{
	sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
}

static void sz_push_full_space(struct streamzap_ir *sz,
			       unsigned char value)
{
	DEFINE_IR_RAW_EVENT(rawir);

	rawir.pulse = false;
	rawir.duration = ((int) value) * SZ_RESOLUTION;
	rawir.duration += SZ_RESOLUTION / 2;
	sz->sum += rawir.duration;
	rawir.duration = US_TO_NS(rawir.duration);
	sz_push(sz, rawir);
}

static void sz_push_half_space(struct streamzap_ir *sz,
			       unsigned long value)
{
	sz_push_full_space(sz, value & SZ_SPACE_MASK);
}

/**
 * streamzap_callback - usb IRQ handler callback
 *
 * This procedure is invoked on reception of data from
 * the usb remote.
 */
static void streamzap_callback(struct urb *urb)
{
	struct streamzap_ir *sz;
	unsigned int i;
	int len;

	if (!urb)
		return;

	sz = urb->context;
	len = urb->actual_length;

	switch (urb->status) {
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/*
		 * this urb is terminated, clean up.
		 * sz might already be invalid at this point
		 */
		dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
		return;
	default:
		break;
	}

	dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
	for (i = 0; i < len; i++) {
		dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
			i, (unsigned char)sz->buf_in[i]);
		switch (sz->decoder_state) {
		case PulseSpace:
			if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
				SZ_PULSE_MASK) {
				sz->decoder_state = FullPulse;
				continue;
			} else if ((sz->buf_in[i] & SZ_SPACE_MASK)
					== SZ_SPACE_MASK) {
				sz_push_half_pulse(sz, sz->buf_in[i]);
				sz->decoder_state = FullSpace;
				continue;
			} else {
				sz_push_half_pulse(sz, sz->buf_in[i]);
				sz_push_half_space(sz, sz->buf_in[i]);
			}
			break;
		case FullPulse:
			sz_push_full_pulse(sz, sz->buf_in[i]);
			sz->decoder_state = IgnorePulse;
			break;
		case FullSpace:
			if (sz->buf_in[i] == SZ_TIMEOUT) {
				DEFINE_IR_RAW_EVENT(rawir);

				rawir.pulse = false;
				rawir.duration = sz->rdev->timeout;
				sz->idle = true;
				if (sz->timeout_enabled)
					sz_push(sz, rawir);
				ir_raw_event_handle(sz->rdev);
				ir_raw_event_reset(sz->rdev);
			} else {
				sz_push_full_space(sz, sz->buf_in[i]);
			}
			sz->decoder_state = PulseSpace;
			break;
		case IgnorePulse:
			if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
				SZ_SPACE_MASK) {
				sz->decoder_state = FullSpace;
				continue;
			}
			sz_push_half_space(sz, sz->buf_in[i]);
			sz->decoder_state = PulseSpace;
			break;
		}
	}

	ir_raw_event_handle(sz->rdev);
	usb_submit_urb(urb, GFP_ATOMIC);

	return;
}

static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
{
	struct rc_dev *rdev;
	struct device *dev = sz->dev;
	int ret;

	rdev = rc_allocate_device();
	if (!rdev) {
		dev_err(dev, "remote dev allocation failed\n");
		goto out;
	}

	snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared "
		 "Receiver (%04x:%04x)",
		 le16_to_cpu(sz->usbdev->descriptor.idVendor),
		 le16_to_cpu(sz->usbdev->descriptor.idProduct));
	usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
	strlcat(sz->phys, "/input0", sizeof(sz->phys));

	rdev->input_name = sz->name;
	rdev->input_phys = sz->phys;
	usb_to_input_id(sz->usbdev, &rdev->input_id);
	rdev->dev.parent = dev;
	rdev->priv = sz;
	rdev->driver_type = RC_DRIVER_IR_RAW;
	rdev->allowed_protos = RC_BIT_ALL;
	rdev->driver_name = DRIVER_NAME;
	rdev->map_name = RC_MAP_STREAMZAP;

	ret = rc_register_device(rdev);
	if (ret < 0) {
		dev_err(dev, "remote input device register failed\n");
		goto out;
	}

	return rdev;

out:
	rc_free_device(rdev);
	return NULL;
}

/**
 *	streamzap_probe
 *
 *	Called by usb-core to associated with a candidate device
 *	On any failure the return value is the ERROR
 *	On success return 0
 */
static int streamzap_probe(struct usb_interface *intf,
			   const struct usb_device_id *id)
{
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct usb_host_interface *iface_host;
	struct streamzap_ir *sz = NULL;
	char buf[63], name[128] = "";
	int retval = -ENOMEM;
	int pipe, maxp;

	/* Allocate space for device driver specific data */
	sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
	if (!sz)
		return -ENOMEM;

	sz->usbdev = usbdev;
	sz->interface = intf;

	/* Check to ensure endpoint information matches requirements */
	iface_host = intf->cur_altsetting;

	if (iface_host->desc.bNumEndpoints != 1) {
		dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
			__func__, iface_host->desc.bNumEndpoints);
		retval = -ENODEV;
		goto free_sz;
	}

	sz->endpoint = &(iface_host->endpoint[0].desc);
	if ((sz->endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
	    != USB_DIR_IN) {
		dev_err(&intf->dev, "%s: endpoint doesn't match input device "
			"02%02x\n", __func__, sz->endpoint->bEndpointAddress);
		retval = -ENODEV;
		goto free_sz;
	}

	if ((sz->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	    != USB_ENDPOINT_XFER_INT) {
		dev_err(&intf->dev, "%s: endpoint attributes don't match xfer "
			"02%02x\n", __func__, sz->endpoint->bmAttributes);
		retval = -ENODEV;
		goto free_sz;
	}

	pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
	maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));

	if (maxp == 0) {
		dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
			__func__);
		retval = -ENODEV;
		goto free_sz;
	}

	/* Allocate the USB buffer and IRQ URB */
	sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
	if (!sz->buf_in)
		goto free_sz;

	sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
	if (!sz->urb_in)
		goto free_buf_in;

	sz->dev = &intf->dev;
	sz->buf_in_len = maxp;

	if (usbdev->descriptor.iManufacturer
	    && usb_string(usbdev, usbdev->descriptor.iManufacturer,
			  buf, sizeof(buf)) > 0)
		strlcpy(name, buf, sizeof(name));

	if (usbdev->descriptor.iProduct
	    && usb_string(usbdev, usbdev->descriptor.iProduct,
			  buf, sizeof(buf)) > 0)
		snprintf(name + strlen(name), sizeof(name) - strlen(name),
			 " %s", buf);

	sz->rdev = streamzap_init_rc_dev(sz);
	if (!sz->rdev)
		goto rc_dev_fail;

	sz->idle = true;
	sz->decoder_state = PulseSpace;
	/* FIXME: don't yet have a way to set this */
	sz->timeout_enabled = true;
	sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
				IR_MAX_DURATION) | 0x03000000);
	#if 0
	/* not yet supported, depends on patches from maxim */
	/* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
	sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
	sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
	#endif

	do_gettimeofday(&sz->signal_start);

	/* Complete final initialisations */
	usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
			 maxp, (usb_complete_t)streamzap_callback,
			 sz, sz->endpoint->bInterval);
	sz->urb_in->transfer_dma = sz->dma_in;
	sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	usb_set_intfdata(intf, sz);

	if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
		dev_err(sz->dev, "urb submit failed\n");

	dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
		 usbdev->bus->busnum, usbdev->devnum);

	/* Load the streamzap not-quite-rc5 decoder too */
	load_rc5_sz_decode();

	return 0;

rc_dev_fail:
	usb_free_urb(sz->urb_in);
free_buf_in:
	usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
free_sz:
	kfree(sz);

	return retval;
}

/**
 * streamzap_disconnect
 *
 * Called by the usb core when the device is removed from the system.
 *
 * This routine guarantees that the driver will not submit any more urbs
 * by clearing dev->usbdev.  It is also supposed to terminate any currently
 * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 * does not provide any way to do this.
 */
static void streamzap_disconnect(struct usb_interface *interface)
{
	struct streamzap_ir *sz = usb_get_intfdata(interface);
	struct usb_device *usbdev = interface_to_usbdev(interface);

	usb_set_intfdata(interface, NULL);

	if (!sz)
		return;

	sz->usbdev = NULL;
	rc_unregister_device(sz->rdev);
	usb_kill_urb(sz->urb_in);
	usb_free_urb(sz->urb_in);
	usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);

	kfree(sz);
}

static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct streamzap_ir *sz = usb_get_intfdata(intf);

	usb_kill_urb(sz->urb_in);

	return 0;
}

static int streamzap_resume(struct usb_interface *intf)
{
	struct streamzap_ir *sz = usb_get_intfdata(intf);

	if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
		dev_err(sz->dev, "Error sumbiting urb\n");
		return -EIO;
	}

	return 0;
}

module_usb_driver(streamzap_driver);

MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debugging messages");