aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb/frontends/or51211.c
blob: f02bd94459556a6874a5d23d83afb28a6bfebc87 (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
/*
 *    Support for OR51211 (pcHDTV HD-2000) - VSB
 *
 *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
 *
 *    Based on code from Jack Kelliher (kelliher@xmission.com)
 *                           Copyright (C) 2002 & pcHDTV, inc.
 *
 *    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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
*/

/*
 * This driver needs external firmware. Please use the command
 * "<kerneldir>/Documentation/dvb/get_dvb_firmware or51211" to
 * download/extract it, and then copy it to /usr/lib/hotplug/firmware
 * or /lib/firmware (depending on configuration of firmware hotplug).
 */
#define OR51211_DEFAULT_FIRMWARE "dvb-fe-or51211.fw"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <asm/byteorder.h>

#include "dvb_math.h"
#include "dvb_frontend.h"
#include "or51211.h"

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "or51211: " args); \
	} while (0)

static u8 run_buf[] = {0x7f,0x01};
static u8 cmd_buf[] = {0x04,0x01,0x50,0x80,0x06}; // ATSC

struct or51211_state {

	struct i2c_adapter* i2c;

	/* Configuration settings */
	const struct or51211_config* config;

	struct dvb_frontend frontend;
	struct bt878* bt;

	/* Demodulator private data */
	u8 initialized:1;
	u32 snr; /* Result of last SNR claculation */

	/* Tuner private data */
	u32 current_frequency;
};

static int i2c_writebytes (struct or51211_state* state, u8 reg, u8 *buf,
			   int len)
{
	int err;
	struct i2c_msg msg;
	msg.addr	= reg;
	msg.flags	= 0;
	msg.len		= len;
	msg.buf		= buf;

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
		printk(KERN_WARNING "or51211: i2c_writebytes error "
		       "(addr %02x, err == %i)\n", reg, err);
		return -EREMOTEIO;
	}

	return 0;
}

static u8 i2c_readbytes (struct or51211_state* state, u8 reg, u8* buf, int len)
{
	int err;
	struct i2c_msg msg;
	msg.addr	= reg;
	msg.flags	= I2C_M_RD;
	msg.len		= len;
	msg.buf		= buf;

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
		printk(KERN_WARNING "or51211: i2c_readbytes error "
		       "(addr %02x, err == %i)\n", reg, err);
		return -EREMOTEIO;
	}

	return 0;
}

static int or51211_load_firmware (struct dvb_frontend* fe,
				  const struct firmware *fw)
{
	struct or51211_state* state = fe->demodulator_priv;
	u8 tudata[585];
	int i;

	dprintk("Firmware is %zd bytes\n",fw->size);

	/* Get eprom data */
	tudata[0] = 17;
	if (i2c_writebytes(state,0x50,tudata,1)) {
		printk(KERN_WARNING "or51211:load_firmware error eprom addr\n");
		return -1;
	}
	if (i2c_readbytes(state,0x50,&tudata[145],192)) {
		printk(KERN_WARNING "or51211: load_firmware error eprom\n");
		return -1;
	}

	/* Create firmware buffer */
	for (i = 0; i < 145; i++)
		tudata[i] = fw->data[i];

	for (i = 0; i < 248; i++)
		tudata[i+337] = fw->data[145+i];

	state->config->reset(fe);

	if (i2c_writebytes(state,state->config->demod_address,tudata,585)) {
		printk(KERN_WARNING "or51211: load_firmware error 1\n");
		return -1;
	}
	msleep(1);

	if (i2c_writebytes(state,state->config->demod_address,
			   &fw->data[393],8125)) {
		printk(KERN_WARNING "or51211: load_firmware error 2\n");
		return -1;
	}
	msleep(1);

	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
		printk(KERN_WARNING "or51211: load_firmware error 3\n");
		return -1;
	}

	/* Wait at least 5 msec */
	msleep(10);
	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
		printk(KERN_WARNING "or51211: load_firmware error 4\n");
		return -1;
	}
	msleep(10);

	printk("or51211: Done.\n");
	return 0;
};

static int or51211_setmode(struct dvb_frontend* fe, int mode)
{
	struct or51211_state* state = fe->demodulator_priv;
	u8 rec_buf[14];

	state->config->setmode(fe, mode);

	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
		printk(KERN_WARNING "or51211: setmode error 1\n");
		return -1;
	}

	/* Wait at least 5 msec */
	msleep(10);
	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
		printk(KERN_WARNING "or51211: setmode error 2\n");
		return -1;
	}

	msleep(10);

	/* Set operation mode in Receiver 1 register;
	 * type 1:
	 * data 0x50h  Automatic sets receiver channel conditions
	 *             Automatic NTSC rejection filter
	 *             Enable  MPEG serial data output
	 *             MPEG2tr
	 *             High tuner phase noise
	 *             normal +/-150kHz Carrier acquisition range
	 */
	if (i2c_writebytes(state,state->config->demod_address,cmd_buf,3)) {
		printk(KERN_WARNING "or51211: setmode error 3\n");
		return -1;
	}

	rec_buf[0] = 0x04;
	rec_buf[1] = 0x00;
	rec_buf[2] = 0x03;
	rec_buf[3] = 0x00;
	msleep(20);
	if (i2c_writebytes(state,state->config->demod_address,rec_buf,3)) {
		printk(KERN_WARNING "or51211: setmode error 5\n");
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,&rec_buf[10],2)) {
		printk(KERN_WARNING "or51211: setmode error 6");
		return -1;
	}
	dprintk("setmode rec status %02x %02x\n",rec_buf[10],rec_buf[11]);

	return 0;
}

static int or51211_set_parameters(struct dvb_frontend* fe,
				  struct dvb_frontend_parameters *param)
{
	struct or51211_state* state = fe->demodulator_priv;

	/* Change only if we are actually changing the channel */
	if (state->current_frequency != param->frequency) {
		if (fe->ops.tuner_ops.set_params) {
			fe->ops.tuner_ops.set_params(fe, param);
			if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
		}

		/* Set to ATSC mode */
		or51211_setmode(fe,0);

		/* Update current frequency */
		state->current_frequency = param->frequency;
	}
	return 0;
}

static int or51211_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
	struct or51211_state* state = fe->demodulator_priv;
	unsigned char rec_buf[2];
	unsigned char snd_buf[] = {0x04,0x00,0x03,0x00};
	*status = 0;

	/* Receiver Status */
	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
		printk(KERN_WARNING "or51132: read_status write error\n");
		return -1;
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
		printk(KERN_WARNING "or51132: read_status read error\n");
		return -1;
	}
	dprintk("read_status %x %x\n",rec_buf[0],rec_buf[1]);

	if (rec_buf[0] &  0x01) { /* Receiver Lock */
		*status |= FE_HAS_SIGNAL;
		*status |= FE_HAS_CARRIER;
		*status |= FE_HAS_VITERBI;
		*status |= FE_HAS_SYNC;
		*status |= FE_HAS_LOCK;
	}
	return 0;
}

/* Calculate SNR estimation (scaled by 2^24)

   8-VSB SNR equation from Oren datasheets

   For 8-VSB:
     SNR[dB] = 10 * log10(219037.9454 / MSE^2 )

   We re-write the snr equation as:
     SNR * 2^24 = 10*(c - 2*intlog10(MSE))
   Where for 8-VSB, c = log10(219037.9454) * 2^24 */

static u32 calculate_snr(u32 mse, u32 c)
{
	if (mse == 0) /* No signal */
		return 0;

	mse = 2*intlog10(mse);
	if (mse > c) {
		/* Negative SNR, which is possible, but realisticly the
		demod will lose lock before the signal gets this bad.  The
		API only allows for unsigned values, so just return 0 */
		return 0;
	}
	return 10*(c - mse);
}

static int or51211_read_snr(struct dvb_frontend* fe, u16* snr)
{
	struct or51211_state* state = fe->demodulator_priv;
	u8 rec_buf[2];
	u8 snd_buf[3];

	/* SNR after Equalizer */
	snd_buf[0] = 0x04;
	snd_buf[1] = 0x00;
	snd_buf[2] = 0x04;

	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
		printk(KERN_WARNING "%s: error writing snr reg\n",
		       __FUNCTION__);
		return -1;
	}
	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
		printk(KERN_WARNING "%s: read_status read error\n",
		       __FUNCTION__);
		return -1;
	}

	state->snr = calculate_snr(rec_buf[0], 89599047);
	*snr = (state->snr) >> 16;

	dprintk("%s: noise = 0x%02x, snr = %d.%02d dB\n", __FUNCTION__, rec_buf[0],
		state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);

	return 0;
}

static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
	/* Calculate Strength from SNR up to 35dB */
	/* Even though the SNR can go higher than 35dB, there is some comfort */
	/* factor in having a range of strong signals that can show at 100%   */
	struct or51211_state* state = (struct or51211_state*)fe->demodulator_priv;
	u16 snr;
	int ret;

	ret = fe->ops.read_snr(fe, &snr);
	if (ret != 0)
		return ret;
	/* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
	/* scale the range 0 - 35*2^24 into 0 - 65535 */
	if (state->snr >= 8960 * 0x10000)
		*strength = 0xffff;
	else
		*strength = state->snr / 8960;

	return 0;
}

static int or51211_read_ber(struct dvb_frontend* fe, u32* ber)
{
	*ber = -ENOSYS;
	return 0;
}

static int or51211_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
	*ucblocks = -ENOSYS;
	return 0;
}

static int or51211_sleep(struct dvb_frontend* fe)
{
	return 0;
}

static int or51211_init(struct dvb_frontend* fe)
{
	struct or51211_state* state = fe->demodulator_priv;
	const struct or51211_config* config = state->config;
	const struct firmware* fw;
	unsigned char get_ver_buf[] = {0x04,0x00,0x30,0x00,0x00};
	unsigned char rec_buf[14];
	int ret,i;

	if (!state->initialized) {
		/* Request the firmware, this will block until it uploads */
		printk(KERN_INFO "or51211: Waiting for firmware upload "
		       "(%s)...\n", OR51211_DEFAULT_FIRMWARE);
		ret = config->request_firmware(fe, &fw,
					       OR51211_DEFAULT_FIRMWARE);
		printk(KERN_INFO "or51211:Got Hotplug firmware\n");
		if (ret) {
			printk(KERN_WARNING "or51211: No firmware uploaded "
			       "(timeout or file not found?)\n");
			return ret;
		}

		ret = or51211_load_firmware(fe, fw);
		release_firmware(fw);
		if (ret) {
			printk(KERN_WARNING "or51211: Writing firmware to "
			       "device failed!\n");
			return ret;
		}
		printk(KERN_INFO "or51211: Firmware upload complete.\n");

		/* Set operation mode in Receiver 1 register;
		 * type 1:
		 * data 0x50h  Automatic sets receiver channel conditions
		 *             Automatic NTSC rejection filter
		 *             Enable  MPEG serial data output
		 *             MPEG2tr
		 *             High tuner phase noise
		 *             normal +/-150kHz Carrier acquisition range
		 */
		if (i2c_writebytes(state,state->config->demod_address,
				   cmd_buf,3)) {
			printk(KERN_WARNING "or51211: Load DVR Error 5\n");
			return -1;
		}

		/* Read back ucode version to besure we loaded correctly */
		/* and are really up and running */
		rec_buf[0] = 0x04;
		rec_buf[1] = 0x00;
		rec_buf[2] = 0x03;
		rec_buf[3] = 0x00;
		msleep(30);
		if (i2c_writebytes(state,state->config->demod_address,
				   rec_buf,3)) {
			printk(KERN_WARNING "or51211: Load DVR Error A\n");
			return -1;
		}
		msleep(3);
		if (i2c_readbytes(state,state->config->demod_address,
				  &rec_buf[10],2)) {
			printk(KERN_WARNING "or51211: Load DVR Error B\n");
			return -1;
		}

		rec_buf[0] = 0x04;
		rec_buf[1] = 0x00;
		rec_buf[2] = 0x01;
		rec_buf[3] = 0x00;
		msleep(20);
		if (i2c_writebytes(state,state->config->demod_address,
				   rec_buf,3)) {
			printk(KERN_WARNING "or51211: Load DVR Error C\n");
			return -1;
		}
		msleep(3);
		if (i2c_readbytes(state,state->config->demod_address,
				  &rec_buf[12],2)) {
			printk(KERN_WARNING "or51211: Load DVR Error D\n");
			return -1;
		}

		for (i = 0; i < 8; i++)
			rec_buf[i]=0xed;

		for (i = 0; i < 5; i++) {
			msleep(30);
			get_ver_buf[4] = i+1;
			if (i2c_writebytes(state,state->config->demod_address,
					   get_ver_buf,5)) {
				printk(KERN_WARNING "or51211:Load DVR Error 6"
				       " - %d\n",i);
				return -1;
			}
			msleep(3);

			if (i2c_readbytes(state,state->config->demod_address,
					  &rec_buf[i*2],2)) {
				printk(KERN_WARNING "or51211:Load DVR Error 7"
				       " - %d\n",i);
				return -1;
			}
			/* If we didn't receive the right index, try again */
			if ((int)rec_buf[i*2+1]!=i+1){
			  i--;
			}
		}
		dprintk("read_fwbits %x %x %x %x %x %x %x %x %x %x\n",
			rec_buf[0], rec_buf[1], rec_buf[2], rec_buf[3],
			rec_buf[4], rec_buf[5], rec_buf[6], rec_buf[7],
			rec_buf[8], rec_buf[9]);

		printk(KERN_INFO "or51211: ver TU%02x%02x%02x VSB mode %02x"
		       " Status %02x\n",
		       rec_buf[2], rec_buf[4],rec_buf[6],
		       rec_buf[12],rec_buf[10]);

		rec_buf[0] = 0x04;
		rec_buf[1] = 0x00;
		rec_buf[2] = 0x03;
		rec_buf[3] = 0x00;
		msleep(20);
		if (i2c_writebytes(state,state->config->demod_address,
				   rec_buf,3)) {
			printk(KERN_WARNING "or51211: Load DVR Error 8\n");
			return -1;
		}
		msleep(20);
		if (i2c_readbytes(state,state->config->demod_address,
				  &rec_buf[8],2)) {
			printk(KERN_WARNING "or51211: Load DVR Error 9\n");
			return -1;
		}
		state->initialized = 1;
	}

	return 0;
}

static int or51211_get_tune_settings(struct dvb_frontend* fe,
				     struct dvb_frontend_tune_settings* fesettings)
{
	fesettings->min_delay_ms = 500;
	fesettings->step_size = 0;
	fesettings->max_drift = 0;
	return 0;
}

static void or51211_release(struct dvb_frontend* fe)
{
	struct or51211_state* state = fe->demodulator_priv;
	state->config->sleep(fe);
	kfree(state);
}

static struct dvb_frontend_ops or51211_ops;

struct dvb_frontend* or51211_attach(const struct or51211_config* config,
				    struct i2c_adapter* i2c)
{
	struct or51211_state* state = NULL;

	/* Allocate memory for the internal state */
	state = kmalloc(sizeof(struct or51211_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* Setup the state */
	state->config = config;
	state->i2c = i2c;
	state->initialized = 0;
	state->current_frequency = 0;

	/* Create dvb_frontend */
	memcpy(&state->frontend.ops, &or51211_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops or51211_ops = {

	.info = {
		.name               = "Oren OR51211 VSB Frontend",
		.type               = FE_ATSC,
		.frequency_min      = 44000000,
		.frequency_max      = 958000000,
		.frequency_stepsize = 166666,
		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
			FE_CAN_8VSB
	},

	.release = or51211_release,

	.init = or51211_init,
	.sleep = or51211_sleep,

	.set_frontend = or51211_set_parameters,
	.get_tune_settings = or51211_get_tune_settings,

	.read_status = or51211_read_status,
	.read_ber = or51211_read_ber,
	.read_signal_strength = or51211_read_signal_strength,
	.read_snr = or51211_read_snr,
	.read_ucblocks = or51211_read_ucblocks,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("Oren OR51211 VSB [pcHDTV HD-2000] Demodulator Driver");
MODULE_AUTHOR("Kirk Lapray");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(or51211_attach);