Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for Microtune MT2060 "Single chip dual conversion broadband tuner"
 *
 *  Copyright (c) 2006 Olivier DANET <odanet@caramail.com>
 */

/* In that file, frequencies are expressed in kiloHertz to avoid 32 bits overflows */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#include <media/dvb_frontend.h>

#include "mt2060.h"
#include "mt2060_priv.h"

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

#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2060: " args); printk("\n"); }} while (0)

// Reads a single register
static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
{
	struct i2c_msg msg[2] = {
		{ .addr = priv->cfg->i2c_address, .flags = 0, .len = 1 },
		{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .len = 1 },
	};
	int rc = 0;
	u8 *b;

	b = kmalloc(2, GFP_KERNEL);
	if (!b)
		return -ENOMEM;

	b[0] = reg;
	b[1] = 0;

	msg[0].buf = b;
	msg[1].buf = b + 1;

	if (i2c_transfer(priv->i2c, msg, 2) != 2) {
		printk(KERN_WARNING "mt2060 I2C read failed\n");
		rc = -EREMOTEIO;
	}
	*val = b[1];
	kfree(b);

	return rc;
}

// Writes a single register
static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val)
{
	struct i2c_msg msg = {
		.addr = priv->cfg->i2c_address, .flags = 0, .len = 2
	};
	u8 *buf;
	int rc = 0;

	buf = kmalloc(2, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	buf[0] = reg;
	buf[1] = val;

	msg.buf = buf;

	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
		printk(KERN_WARNING "mt2060 I2C write failed\n");
		rc = -EREMOTEIO;
	}
	kfree(buf);
	return rc;
}

// Writes a set of consecutive registers
static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
{
	int rem, val_len;
	u8 *xfer_buf;
	int rc = 0;
	struct i2c_msg msg = {
		.addr = priv->cfg->i2c_address, .flags = 0
	};

	xfer_buf = kmalloc(16, GFP_KERNEL);
	if (!xfer_buf)
		return -ENOMEM;

	msg.buf = xfer_buf;

	for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) {
		val_len = min_t(int, rem, priv->i2c_max_regs);
		msg.len = 1 + val_len;
		xfer_buf[0] = buf[0] + len - 1 - rem;
		memcpy(&xfer_buf[1], &buf[1 + len - 1 - rem], val_len);

		if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
			printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len);
			rc = -EREMOTEIO;
			break;
		}
	}

	kfree(xfer_buf);
	return rc;
}

// Initialisation sequences
// LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49
static u8 mt2060_config1[] = {
	REG_LO1C1,
	0x3F,	0x74,	0x00,	0x08,	0x93
};

// FMCG=2, GP2=0, GP1=0
static u8 mt2060_config2[] = {
	REG_MISC_CTRL,
	0x20,	0x1E,	0x30,	0xff,	0x80,	0xff,	0x00,	0x2c,	0x42
};

//  VGAG=3, V1CSE=1

#ifdef  MT2060_SPURCHECK
/* The function below calculates the frequency offset between the output frequency if2
 and the closer cross modulation subcarrier between lo1 and lo2 up to the tenth harmonic */
static int mt2060_spurcalc(u32 lo1,u32 lo2,u32 if2)
{
	int I,J;
	int dia,diamin,diff;
	diamin=1000000;
	for (I = 1; I < 10; I++) {
		J = ((2*I*lo1)/lo2+1)/2;
		diff = I*(int)lo1-J*(int)lo2;
		if (diff < 0) diff=-diff;
		dia = (diff-(int)if2);
		if (dia < 0) dia=-dia;
		if (diamin > dia) diamin=dia;
	}
	return diamin;
}

#define BANDWIDTH 4000 // kHz

/* Calculates the frequency offset to add to avoid spurs. Returns 0 if no offset is needed */
static int mt2060_spurcheck(u32 lo1,u32 lo2,u32 if2)
{
	u32 Spur,Sp1,Sp2;
	int I,J;
	I=0;
	J=1000;

	Spur=mt2060_spurcalc(lo1,lo2,if2);
	if (Spur < BANDWIDTH) {
		/* Potential spurs detected */
		dprintk("Spurs before : f_lo1: %d  f_lo2: %d  (kHz)",
			(int)lo1,(int)lo2);
		I=1000;
		Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
		Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);

		if (Sp1 < Sp2) {
			J=-J; I=-I; Spur=Sp2;
		} else
			Spur=Sp1;

		while (Spur < BANDWIDTH) {
			I += J;
			Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);
		}
		dprintk("Spurs after  : f_lo1: %d  f_lo2: %d  (kHz)",
			(int)(lo1+I),(int)(lo2+I));
	}
	return I;
}
#endif

#define IF2  36150       // IF2 frequency = 36.150 MHz
#define FREF 16000       // Quartz oscillator 16 MHz

static int mt2060_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct mt2060_priv *priv;
	int i=0;
	u32 freq;
	u8  lnaband;
	u32 f_lo1,f_lo2;
	u32 div1,num1,div2,num2;
	u8  b[8];
	u32 if1;

	priv = fe->tuner_priv;

	if1 = priv->if1_freq;
	b[0] = REG_LO1B1;
	b[1] = 0xFF;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */

	mt2060_writeregs(priv,b,2);

	freq = c->frequency / 1000; /* Hz -> kHz */

	f_lo1 = freq + if1 * 1000;
	f_lo1 = (f_lo1 / 250) * 250;
	f_lo2 = f_lo1 - freq - IF2;
	// From the Comtech datasheet, the step used is 50kHz. The tuner chip could be more precise
	f_lo2 = ((f_lo2 + 25) / 50) * 50;
	priv->frequency =  (f_lo1 - f_lo2 - IF2) * 1000,

#ifdef MT2060_SPURCHECK
	// LO-related spurs detection and correction
	num1   = mt2060_spurcheck(f_lo1,f_lo2,IF2);
	f_lo1 += num1;
	f_lo2 += num1;
#endif
	//Frequency LO1 = 16MHz * (DIV1 + NUM1/64 )
	num1 = f_lo1 / (FREF / 64);
	div1 = num1 / 64;
	num1 &= 0x3f;

	// Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 )
	num2 = f_lo2 * 64 / (FREF / 128);
	div2 = num2 / 8192;
	num2 &= 0x1fff;

	if (freq <=  95000) lnaband = 0xB0; else
	if (freq <= 180000) lnaband = 0xA0; else
	if (freq <= 260000) lnaband = 0x90; else
	if (freq <= 335000) lnaband = 0x80; else
	if (freq <= 425000) lnaband = 0x70; else
	if (freq <= 480000) lnaband = 0x60; else
	if (freq <= 570000) lnaband = 0x50; else
	if (freq <= 645000) lnaband = 0x40; else
	if (freq <= 730000) lnaband = 0x30; else
	if (freq <= 810000) lnaband = 0x20; else lnaband = 0x10;

	b[0] = REG_LO1C1;
	b[1] = lnaband | ((num1 >>2) & 0x0F);
	b[2] = div1;
	b[3] = (num2 & 0x0F)  | ((num1 & 3) << 4);
	b[4] = num2 >> 4;
	b[5] = ((num2 >>12) & 1) | (div2 << 1);

	dprintk("IF1: %dMHz",(int)if1);
	dprintk("PLL freq=%dkHz  f_lo1=%dkHz  f_lo2=%dkHz",(int)freq,(int)f_lo1,(int)f_lo2);
	dprintk("PLL div1=%d  num1=%d  div2=%d  num2=%d",(int)div1,(int)num1,(int)div2,(int)num2);
	dprintk("PLL [1..5]: %2x %2x %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3],(int)b[4],(int)b[5]);

	mt2060_writeregs(priv,b,6);

	//Waits for pll lock or timeout
	i = 0;
	do {
		mt2060_readreg(priv,REG_LO_STATUS,b);
		if ((b[0] & 0x88)==0x88)
			break;
		msleep(4);
		i++;
	} while (i<10);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	return 0;
}

static void mt2060_calibrate(struct mt2060_priv *priv)
{
	u8 b = 0;
	int i = 0;

	if (mt2060_writeregs(priv,mt2060_config1,sizeof(mt2060_config1)))
		return;
	if (mt2060_writeregs(priv,mt2060_config2,sizeof(mt2060_config2)))
		return;

	/* initialize the clock output */
	mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);

	do {
		b |= (1 << 6); // FM1SS;
		mt2060_writereg(priv, REG_LO2C1,b);
		msleep(20);

		if (i == 0) {
			b |= (1 << 7); // FM1CA;
			mt2060_writereg(priv, REG_LO2C1,b);
			b &= ~(1 << 7); // FM1CA;
			msleep(20);
		}

		b &= ~(1 << 6); // FM1SS
		mt2060_writereg(priv, REG_LO2C1,b);

		msleep(20);
		i++;
	} while (i < 9);

	i = 0;
	while (i++ < 10 && mt2060_readreg(priv, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0)
		msleep(20);

	if (i <= 10) {
		mt2060_readreg(priv, REG_FM_FREQ, &priv->fmfreq); // now find out, what is fmreq used for :)
		dprintk("calibration was successful: %d", (int)priv->fmfreq);
	} else
		dprintk("FMCAL timed out");
}

static int mt2060_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct mt2060_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
}

static int mt2060_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	*frequency = IF2 * 1000;
	return 0;
}

static int mt2060_init(struct dvb_frontend *fe)
{
	struct mt2060_priv *priv = fe->tuner_priv;
	int ret;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */

	if (priv->sleep) {
		ret = mt2060_writereg(priv, REG_MISC_CTRL, 0x20);
		if (ret)
			goto err_i2c_gate_ctrl;
	}

	ret = mt2060_writereg(priv, REG_VGAG,
			      (priv->cfg->clock_out << 6) | 0x33);

err_i2c_gate_ctrl:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	return ret;
}

static int mt2060_sleep(struct dvb_frontend *fe)
{
	struct mt2060_priv *priv = fe->tuner_priv;
	int ret;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */

	ret = mt2060_writereg(priv, REG_VGAG,
			      (priv->cfg->clock_out << 6) | 0x30);
	if (ret)
		goto err_i2c_gate_ctrl;

	if (priv->sleep)
		ret = mt2060_writereg(priv, REG_MISC_CTRL, 0xe8);

err_i2c_gate_ctrl:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	return ret;
}

static void mt2060_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
}

static const struct dvb_tuner_ops mt2060_tuner_ops = {
	.info = {
		.name              = "Microtune MT2060",
		.frequency_min_hz  =  48 * MHz,
		.frequency_max_hz  = 860 * MHz,
		.frequency_step_hz =  50 * kHz,
	},

	.release       = mt2060_release,

	.init          = mt2060_init,
	.sleep         = mt2060_sleep,

	.set_params    = mt2060_set_params,
	.get_frequency = mt2060_get_frequency,
	.get_if_frequency = mt2060_get_if_frequency,
};

/* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */
struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2060_config *cfg, u16 if1)
{
	struct mt2060_priv *priv = NULL;
	u8 id = 0;

	priv = kzalloc(sizeof(struct mt2060_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	priv->cfg      = cfg;
	priv->i2c      = i2c;
	priv->if1_freq = if1;
	priv->i2c_max_regs = ~0;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */

	if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) {
		kfree(priv);
		return NULL;
	}

	if (id != PART_REV) {
		kfree(priv);
		return NULL;
	}
	printk(KERN_INFO "MT2060: successfully identified (IF1 = %d)\n", if1);
	memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(struct dvb_tuner_ops));

	fe->tuner_priv = priv;

	mt2060_calibrate(priv);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	return fe;
}
EXPORT_SYMBOL(mt2060_attach);

static int mt2060_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct mt2060_platform_data *pdata = client->dev.platform_data;
	struct dvb_frontend *fe;
	struct mt2060_priv *dev;
	int ret;
	u8 chip_id;

	dev_dbg(&client->dev, "\n");

	if (!pdata) {
		dev_err(&client->dev, "Cannot proceed without platform data\n");
		ret = -EINVAL;
		goto err;
	}

	dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		ret = -ENOMEM;
		goto err;
	}

	fe = pdata->dvb_frontend;
	dev->config.i2c_address = client->addr;
	dev->config.clock_out = pdata->clock_out;
	dev->cfg = &dev->config;
	dev->i2c = client->adapter;
	dev->if1_freq = pdata->if1 ? pdata->if1 : 1220;
	dev->client = client;
	dev->i2c_max_regs = pdata->i2c_write_max ? pdata->i2c_write_max - 1 : ~0;
	dev->sleep = true;

	ret = mt2060_readreg(dev, REG_PART_REV, &chip_id);
	if (ret) {
		ret = -ENODEV;
		goto err;
	}

	dev_dbg(&client->dev, "chip id=%02x\n", chip_id);

	if (chip_id != PART_REV) {
		ret = -ENODEV;
		goto err;
	}

	/* Power on, calibrate, sleep */
	ret = mt2060_writereg(dev, REG_MISC_CTRL, 0x20);
	if (ret)
		goto err;
	mt2060_calibrate(dev);
	ret = mt2060_writereg(dev, REG_MISC_CTRL, 0xe8);
	if (ret)
		goto err;

	dev_info(&client->dev, "Microtune MT2060 successfully identified\n");
	memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(fe->ops.tuner_ops));
	fe->ops.tuner_ops.release = NULL;
	fe->tuner_priv = dev;
	i2c_set_clientdata(client, dev);

	return 0;
err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
}

static int mt2060_remove(struct i2c_client *client)
{
	dev_dbg(&client->dev, "\n");

	return 0;
}

static const struct i2c_device_id mt2060_id_table[] = {
	{"mt2060", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, mt2060_id_table);

static struct i2c_driver mt2060_driver = {
	.driver = {
		.name = "mt2060",
		.suppress_bind_attrs = true,
	},
	.probe		= mt2060_probe,
	.remove		= mt2060_remove,
	.id_table	= mt2060_id_table,
};

module_i2c_driver(mt2060_driver);

MODULE_AUTHOR("Olivier DANET");
MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
MODULE_LICENSE("GPL");