summaryrefslogtreecommitdiff
path: root/drivers/media/pci/bt8xx/bttv-input.c
blob: bb8eda51ee274357338f414430126b0e7122ada4 (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
/*
 *
 * Copyright (c) 2003 Gerd Knorr
 * Copyright (c) 2003 Pavel Machek
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/slab.h>

#include "bttv.h"
#include "bttvp.h"


static int ir_debug;
module_param(ir_debug, int, 0644);

static int ir_rc5_remote_gap = 885;
module_param(ir_rc5_remote_gap, int, 0644);

#undef dprintk
#define dprintk(fmt, ...)			\
do {						\
	if (ir_debug >= 1)			\
		pr_info(fmt, ##__VA_ARGS__);	\
} while (0)

#define DEVNAME "bttv-input"

#define MODULE_NAME "bttv"

/* ---------------------------------------------------------------------- */

static void ir_handle_key(struct bttv *btv)
{
	struct bttv_ir *ir = btv->remote;
	u32 gpio,data;

	/* read gpio value */
	gpio = bttv_gpio_read(&btv->c);
	if (ir->polling) {
		if (ir->last_gpio == gpio)
			return;
		ir->last_gpio = gpio;
	}

	/* extract data */
	data = ir_extract_bits(gpio, ir->mask_keycode);
	dprintk("irq gpio=0x%x code=%d | %s%s%s\n",
		gpio, data,
		ir->polling               ? "poll"  : "irq",
		(gpio & ir->mask_keydown) ? " down" : "",
		(gpio & ir->mask_keyup)   ? " up"   : "");

	if ((ir->mask_keydown && (gpio & ir->mask_keydown)) ||
	    (ir->mask_keyup   && !(gpio & ir->mask_keyup))) {
		rc_keydown_notimeout(ir->dev, RC_TYPE_UNKNOWN, data, 0);
	} else {
		/* HACK: Probably, ir->mask_keydown is missing
		   for this board */
		if (btv->c.type == BTTV_BOARD_WINFAST2000)
			rc_keydown_notimeout(ir->dev, RC_TYPE_UNKNOWN, data, 0);

		rc_keyup(ir->dev);
	}
}

static void ir_enltv_handle_key(struct bttv *btv)
{
	struct bttv_ir *ir = btv->remote;
	u32 gpio, data, keyup;

	/* read gpio value */
	gpio = bttv_gpio_read(&btv->c);

	/* extract data */
	data = ir_extract_bits(gpio, ir->mask_keycode);

	/* Check if it is keyup */
	keyup = (gpio & ir->mask_keyup) ? 1 << 31 : 0;

	if ((ir->last_gpio & 0x7f) != data) {
		dprintk("gpio=0x%x code=%d | %s\n",
			gpio, data,
			(gpio & ir->mask_keyup) ? " up" : "up/down");

		rc_keydown_notimeout(ir->dev, RC_TYPE_UNKNOWN, data, 0);
		if (keyup)
			rc_keyup(ir->dev);
	} else {
		if ((ir->last_gpio & 1 << 31) == keyup)
			return;

		dprintk("(cnt) gpio=0x%x code=%d | %s\n",
			gpio, data,
			(gpio & ir->mask_keyup) ? " up" : "down");

		if (keyup)
			rc_keyup(ir->dev);
		else
			rc_keydown_notimeout(ir->dev, RC_TYPE_UNKNOWN, data, 0);
	}

	ir->last_gpio = data | keyup;
}

static int bttv_rc5_irq(struct bttv *btv);

void bttv_input_irq(struct bttv *btv)
{
	struct bttv_ir *ir = btv->remote;

	if (ir->rc5_gpio)
		bttv_rc5_irq(btv);
	else if (!ir->polling)
		ir_handle_key(btv);
}

static void bttv_input_timer(unsigned long data)
{
	struct bttv *btv = (struct bttv*)data;
	struct bttv_ir *ir = btv->remote;

	if (btv->c.type == BTTV_BOARD_ENLTV_FM_2)
		ir_enltv_handle_key(btv);
	else
		ir_handle_key(btv);
	mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
}

/*
 * FIXME: Nebula digi uses the legacy way to decode RC5, instead of relying
 * on the rc-core way. As we need to be sure that both IRQ transitions are
 * properly triggered, Better to touch it only with this hardware for
 * testing.
 */

#define RC5_START(x)	(((x) >> 12) & 0x03)
#define RC5_TOGGLE(x)	(((x) >> 11) & 0x01)
#define RC5_ADDR(x)	(((x) >> 6)  & 0x1f)
#define RC5_INSTR(x)	(((x) >> 0)  & 0x3f)

/* decode raw bit pattern to RC5 code */
static u32 bttv_rc5_decode(unsigned int code)
{
	unsigned int org_code = code;
	unsigned int pair;
	unsigned int rc5 = 0;
	int i;

	for (i = 0; i < 14; ++i) {
		pair = code & 0x3;
		code >>= 2;

		rc5 <<= 1;
		switch (pair) {
		case 0:
		case 2:
			break;
		case 1:
			rc5 |= 1;
		break;
		case 3:
			dprintk("rc5_decode(%x) bad code\n",
				org_code);
			return 0;
		}
	}
	dprintk("code=%x, rc5=%x, start=%x, toggle=%x, address=%x, instr=%x\n",
		rc5, org_code, RC5_START(rc5),
		RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
	return rc5;
}

static void bttv_rc5_timer_end(unsigned long data)
{
	struct bttv_ir *ir = (struct bttv_ir *)data;
	ktime_t tv;
	u32 gap, rc5, scancode;
	u8 toggle, command, system;

	/* get time */
	tv = ktime_get();

	gap = ktime_to_us(ktime_sub(tv, ir->base_time));
	/* avoid overflow with gap >1s */
	if (gap > USEC_PER_SEC) {
		gap = 200000;
	}
	/* signal we're ready to start a new code */
	ir->active = false;

	/* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
	if (gap < 28000) {
		dprintk("spurious timer_end\n");
		return;
	}

	if (ir->last_bit < 20) {
		/* ignore spurious codes (caused by light/other remotes) */
		dprintk("short code: %x\n", ir->code);
		return;
	}

	ir->code = (ir->code << ir->shift_by) | 1;
	rc5 = bttv_rc5_decode(ir->code);

	toggle = RC5_TOGGLE(rc5);
	system = RC5_ADDR(rc5);
	command = RC5_INSTR(rc5);

	switch (RC5_START(rc5)) {
	case 0x3:
		break;
	case 0x2:
		command += 0x40;
		break;
	default:
		return;
	}

	scancode = RC_SCANCODE_RC5(system, command);
	rc_keydown(ir->dev, RC_TYPE_RC5, scancode, toggle);
	dprintk("scancode %x, toggle %x\n", scancode, toggle);
}

static int bttv_rc5_irq(struct bttv *btv)
{
	struct bttv_ir *ir = btv->remote;
	ktime_t tv;
	u32 gpio;
	u32 gap;
	unsigned long current_jiffies;

	/* read gpio port */
	gpio = bttv_gpio_read(&btv->c);

	/* get time of bit */
	current_jiffies = jiffies;
	tv = ktime_get();

	gap = ktime_to_us(ktime_sub(tv, ir->base_time));
	/* avoid overflow with gap >1s */
	if (gap > USEC_PER_SEC) {
		gap = 200000;
	}

	dprintk("RC5 IRQ: gap %d us for %s\n",
		gap, (gpio & 0x20) ? "mark" : "space");

	/* remote IRQ? */
	if (!(gpio & 0x20))
		return 0;

	/* active code => add bit */
	if (ir->active) {
		/* only if in the code (otherwise spurious IRQ or timer
		   late) */
		if (ir->last_bit < 28) {
			ir->last_bit = (gap - ir_rc5_remote_gap / 2) /
			    ir_rc5_remote_gap;
			ir->code |= 1 << ir->last_bit;
		}
		/* starting new code */
	} else {
		ir->active = true;
		ir->code = 0;
		ir->base_time = tv;
		ir->last_bit = 0;

		mod_timer(&ir->timer, current_jiffies + msecs_to_jiffies(30));
	}

	/* toggle GPIO pin 4 to reset the irq */
	bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
	bttv_gpio_write(&btv->c, gpio | (1 << 4));
	return 1;
}

/* ---------------------------------------------------------------------- */

static void bttv_ir_start(struct bttv *btv, struct bttv_ir *ir)
{
	if (ir->polling) {
		setup_timer(&ir->timer, bttv_input_timer, (unsigned long)btv);
		ir->timer.expires  = jiffies + msecs_to_jiffies(1000);
		add_timer(&ir->timer);
	} else if (ir->rc5_gpio) {
		/* set timer_end for code completion */
		setup_timer(&ir->timer, bttv_rc5_timer_end, (unsigned long)ir);
		ir->shift_by = 1;
		ir->rc5_remote_gap = ir_rc5_remote_gap;
	}
}

static void bttv_ir_stop(struct bttv *btv)
{
	if (btv->remote->polling)
		del_timer_sync(&btv->remote->timer);

	if (btv->remote->rc5_gpio) {
		u32 gpio;

		del_timer_sync(&btv->remote->timer);

		gpio = bttv_gpio_read(&btv->c);
		bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
	}
}

/*
 * Get_key functions used by I2C remotes
 */

static int get_key_pv951(struct IR_i2c *ir, enum rc_type *protocol,
			 u32 *scancode, u8 *toggle)
{
	unsigned char b;

	/* poll IR chip */
	if (1 != i2c_master_recv(ir->c, &b, 1)) {
		dprintk("read error\n");
		return -EIO;
	}

	/* ignore 0xaa */
	if (b==0xaa)
		return 0;
	dprintk("key %02x\n", b);

	/*
	 * NOTE:
	 * lirc_i2c maps the pv951 code as:
	 *	addr = 0x61D6
	 * 	cmd = bit_reverse (b)
	 * So, it seems that this device uses NEC extended
	 * I decided to not fix the table, due to two reasons:
	 * 	1) Without the actual device, this is only a guess;
	 * 	2) As the addr is not reported via I2C, nor can be changed,
	 * 	   the device is bound to the vendor-provided RC.
	 */

	*protocol = RC_TYPE_UNKNOWN;
	*scancode = b;
	*toggle = 0;
	return 1;
}

/* Instantiate the I2C IR receiver device, if present */
void init_bttv_i2c_ir(struct bttv *btv)
{
	const unsigned short addr_list[] = {
		0x1a, 0x18, 0x64, 0x30, 0x71,
		I2C_CLIENT_END
	};
	struct i2c_board_info info;
	struct i2c_client *i2c_dev;

	if (0 != btv->i2c_rc)
		return;

	memset(&info, 0, sizeof(struct i2c_board_info));
	memset(&btv->init_data, 0, sizeof(btv->init_data));
	strlcpy(info.type, "ir_video", I2C_NAME_SIZE);

	switch (btv->c.type) {
	case BTTV_BOARD_PV951:
		btv->init_data.name = "PV951";
		btv->init_data.get_key = get_key_pv951;
		btv->init_data.ir_codes = RC_MAP_PV951;
		info.addr = 0x4b;
		break;
	}

	if (btv->init_data.name) {
		info.platform_data = &btv->init_data;
		i2c_dev = i2c_new_device(&btv->c.i2c_adap, &info);
	} else {
		/*
		 * The external IR receiver is at i2c address 0x34 (0x35 for
		 * reads).  Future Hauppauge cards will have an internal
		 * receiver at 0x30 (0x31 for reads).  In theory, both can be
		 * fitted, and Hauppauge suggest an external overrides an
		 * internal.
		 * That's why we probe 0x1a (~0x34) first. CB
		 */
		i2c_dev = i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list, NULL);
	}
	if (NULL == i2c_dev)
		return;

#if defined(CONFIG_MODULES) && defined(MODULE)
	request_module("ir-kbd-i2c");
#endif
}

int bttv_input_init(struct bttv *btv)
{
	struct bttv_ir *ir;
	char *ir_codes = NULL;
	struct rc_dev *rc;
	int err = -ENOMEM;

	if (!btv->has_remote)
		return -ENODEV;

	ir = kzalloc(sizeof(*ir),GFP_KERNEL);
	rc = rc_allocate_device(RC_DRIVER_SCANCODE);
	if (!ir || !rc)
		goto err_out_free;

	/* detect & configure */
	switch (btv->c.type) {
	case BTTV_BOARD_AVERMEDIA:
	case BTTV_BOARD_AVPHONE98:
	case BTTV_BOARD_AVERMEDIA98:
		ir_codes         = RC_MAP_AVERMEDIA;
		ir->mask_keycode = 0xf88000;
		ir->mask_keydown = 0x010000;
		ir->polling      = 50; // ms
		break;

	case BTTV_BOARD_AVDVBT_761:
	case BTTV_BOARD_AVDVBT_771:
		ir_codes         = RC_MAP_AVERMEDIA_DVBT;
		ir->mask_keycode = 0x0f00c0;
		ir->mask_keydown = 0x000020;
		ir->polling      = 50; // ms
		break;

	case BTTV_BOARD_PXELVWPLTVPAK:
		ir_codes         = RC_MAP_PIXELVIEW;
		ir->mask_keycode = 0x003e00;
		ir->mask_keyup   = 0x010000;
		ir->polling      = 50; // ms
		break;
	case BTTV_BOARD_PV_M4900:
	case BTTV_BOARD_PV_BT878P_9B:
	case BTTV_BOARD_PV_BT878P_PLUS:
		ir_codes         = RC_MAP_PIXELVIEW;
		ir->mask_keycode = 0x001f00;
		ir->mask_keyup   = 0x008000;
		ir->polling      = 50; // ms
		break;

	case BTTV_BOARD_WINFAST2000:
		ir_codes         = RC_MAP_WINFAST;
		ir->mask_keycode = 0x1f8;
		break;
	case BTTV_BOARD_MAGICTVIEW061:
	case BTTV_BOARD_MAGICTVIEW063:
		ir_codes         = RC_MAP_WINFAST;
		ir->mask_keycode = 0x0008e000;
		ir->mask_keydown = 0x00200000;
		break;
	case BTTV_BOARD_APAC_VIEWCOMP:
		ir_codes         = RC_MAP_APAC_VIEWCOMP;
		ir->mask_keycode = 0x001f00;
		ir->mask_keyup   = 0x008000;
		ir->polling      = 50; // ms
		break;
	case BTTV_BOARD_ASKEY_CPH03X:
	case BTTV_BOARD_CONCEPTRONIC_CTVFMI2:
	case BTTV_BOARD_CONTVFMI:
	case BTTV_BOARD_KWORLD_VSTREAM_XPERT:
		ir_codes         = RC_MAP_PIXELVIEW;
		ir->mask_keycode = 0x001F00;
		ir->mask_keyup   = 0x006000;
		ir->polling      = 50; // ms
		break;
	case BTTV_BOARD_NEBULA_DIGITV:
		ir_codes         = RC_MAP_NEBULA;
		ir->rc5_gpio     = true;
		break;
	case BTTV_BOARD_MACHTV_MAGICTV:
		ir_codes         = RC_MAP_APAC_VIEWCOMP;
		ir->mask_keycode = 0x001F00;
		ir->mask_keyup   = 0x004000;
		ir->polling      = 50; /* ms */
		break;
	case BTTV_BOARD_KOZUMI_KTV_01C:
		ir_codes         = RC_MAP_PCTV_SEDNA;
		ir->mask_keycode = 0x001f00;
		ir->mask_keyup   = 0x006000;
		ir->polling      = 50; /* ms */
		break;
	case BTTV_BOARD_ENLTV_FM_2:
		ir_codes         = RC_MAP_ENCORE_ENLTV2;
		ir->mask_keycode = 0x00fd00;
		ir->mask_keyup   = 0x000080;
		ir->polling      = 1; /* ms */
		ir->last_gpio    = ir_extract_bits(bttv_gpio_read(&btv->c),
						   ir->mask_keycode);
		break;
	}

	if (!ir_codes) {
		dprintk("Ooops: IR config error [card=%d]\n", btv->c.type);
		err = -ENODEV;
		goto err_out_free;
	}

	if (ir->rc5_gpio) {
		u32 gpio;
		/* enable remote irq */
		bttv_gpio_inout(&btv->c, (1 << 4), 1 << 4);
		gpio = bttv_gpio_read(&btv->c);
		bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
		bttv_gpio_write(&btv->c, gpio | (1 << 4));
	} else {
		/* init hardware-specific stuff */
		bttv_gpio_inout(&btv->c, ir->mask_keycode | ir->mask_keydown, 0);
	}

	/* init input device */
	ir->dev = rc;

	snprintf(ir->name, sizeof(ir->name), "bttv IR (card=%d)",
		 btv->c.type);
	snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0",
		 pci_name(btv->c.pci));

	rc->device_name = ir->name;
	rc->input_phys = ir->phys;
	rc->input_id.bustype = BUS_PCI;
	rc->input_id.version = 1;
	if (btv->c.pci->subsystem_vendor) {
		rc->input_id.vendor  = btv->c.pci->subsystem_vendor;
		rc->input_id.product = btv->c.pci->subsystem_device;
	} else {
		rc->input_id.vendor  = btv->c.pci->vendor;
		rc->input_id.product = btv->c.pci->device;
	}
	rc->dev.parent = &btv->c.pci->dev;
	rc->map_name = ir_codes;
	rc->driver_name = MODULE_NAME;

	btv->remote = ir;
	bttv_ir_start(btv, ir);

	/* all done */
	err = rc_register_device(rc);
	if (err)
		goto err_out_stop;

	return 0;

 err_out_stop:
	bttv_ir_stop(btv);
	btv->remote = NULL;
 err_out_free:
	rc_free_device(rc);
	kfree(ir);
	return err;
}

void bttv_input_fini(struct bttv *btv)
{
	if (btv->remote == NULL)
		return;

	bttv_ir_stop(btv);
	rc_unregister_device(btv->remote->dev);
	kfree(btv->remote);
	btv->remote = NULL;
}