Free Electrons

Embedded Linux Experts

  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
/*
 *  mxl111sf-tuner.c - driver for the MaxLinear MXL111SF CMOS tuner
 *
 *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "mxl111sf-tuner.h"
#include "mxl111sf-phy.h"
#include "mxl111sf-reg.h"

/* debug */
static int mxl111sf_tuner_debug;
module_param_named(debug, mxl111sf_tuner_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");

#define mxl_dbg(fmt, arg...) \
	if (mxl111sf_tuner_debug) \
		mxl_printk(KERN_DEBUG, fmt, ##arg)

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

struct mxl111sf_tuner_state {
	struct mxl111sf_state *mxl_state;

	struct mxl111sf_tuner_config *cfg;

	enum mxl_if_freq if_freq;

	u32 frequency;
	u32 bandwidth;
};

static int mxl111sf_tuner_read_reg(struct mxl111sf_tuner_state *state,
				   u8 addr, u8 *data)
{
	return (state->cfg->read_reg) ?
		state->cfg->read_reg(state->mxl_state, addr, data) :
		-EINVAL;
}

static int mxl111sf_tuner_write_reg(struct mxl111sf_tuner_state *state,
				    u8 addr, u8 data)
{
	return (state->cfg->write_reg) ?
		state->cfg->write_reg(state->mxl_state, addr, data) :
		-EINVAL;
}

static int mxl111sf_tuner_program_regs(struct mxl111sf_tuner_state *state,
			       struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
{
	return (state->cfg->program_regs) ?
		state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
		-EINVAL;
}

static int mxl1x1sf_tuner_top_master_ctrl(struct mxl111sf_tuner_state *state,
					  int onoff)
{
	return (state->cfg->top_master_ctrl) ?
		state->cfg->top_master_ctrl(state->mxl_state, onoff) :
		-EINVAL;
}

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

static struct mxl111sf_reg_ctrl_info mxl_phy_tune_rf[] = {
	{0x1d, 0x7f, 0x00}, /* channel bandwidth section 1/2/3,
			       DIG_MODEINDEX, _A, _CSF, */
	{0x1e, 0xff, 0x00}, /* channel frequency (lo and fractional) */
	{0x1f, 0xff, 0x00}, /* channel frequency (hi for integer portion) */
	{0,    0,    0}
};

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

static struct mxl111sf_reg_ctrl_info *mxl111sf_calc_phy_tune_regs(u32 freq,
								  u8 bw)
{
	u8 filt_bw;

	/* set channel bandwidth */
	switch (bw) {
	case 0: /* ATSC */
		filt_bw = 25;
		break;
	case 1: /* QAM */
		filt_bw = 69;
		break;
	case 6:
		filt_bw = 21;
		break;
	case 7:
		filt_bw = 42;
		break;
	case 8:
		filt_bw = 63;
		break;
	default:
		err("%s: invalid bandwidth setting!", __func__);
		return NULL;
	}

	/* calculate RF channel */
	freq /= 1000000;

	freq *= 64;
#if 0
	/* do round */
	freq += 0.5;
#endif
	/* set bandwidth */
	mxl_phy_tune_rf[0].data = filt_bw;

	/* set RF */
	mxl_phy_tune_rf[1].data = (freq & 0xff);
	mxl_phy_tune_rf[2].data = (freq >> 8) & 0xff;

	/* start tune */
	return mxl_phy_tune_rf;
}

static int mxl1x1sf_tuner_set_if_output_freq(struct mxl111sf_tuner_state *state)
{
	int ret;
	u8 ctrl;
#if 0
	u16 iffcw;
	u32 if_freq;
#endif
	mxl_dbg("(IF polarity = %d, IF freq = 0x%02x)",
		state->cfg->invert_spectrum, state->cfg->if_freq);

	/* set IF polarity */
	ctrl = state->cfg->invert_spectrum;

	ctrl |= state->cfg->if_freq;

	ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_SEL_REG, ctrl);
	if (mxl_fail(ret))
		goto fail;

#if 0
	if_freq /= 1000000;

	/* do round */
	if_freq += 0.5;

	if (MXL_IF_LO == state->cfg->if_freq) {
		ctrl = 0x08;
		iffcw = (u16)(if_freq / (108 * 4096));
	} else if (MXL_IF_HI == state->cfg->if_freq) {
		ctrl = 0x08;
		iffcw = (u16)(if_freq / (216 * 4096));
	} else {
		ctrl = 0;
		iffcw = 0;
	}

	ctrl |= (iffcw >> 8);
#endif
	ret = mxl111sf_tuner_read_reg(state, V6_TUNER_IF_FCW_BYP_REG, &ctrl);
	if (mxl_fail(ret))
		goto fail;

	ctrl &= 0xf0;
	ctrl |= 0x90;

	ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_FCW_BYP_REG, ctrl);
	if (mxl_fail(ret))
		goto fail;

#if 0
	ctrl = iffcw & 0x00ff;
#endif
	ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_FCW_REG, ctrl);
	if (mxl_fail(ret))
		goto fail;

	state->if_freq = state->cfg->if_freq;
fail:
	return ret;
}

static int mxl1x1sf_tune_rf(struct dvb_frontend *fe, u32 freq, u8 bw)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	static struct mxl111sf_reg_ctrl_info *reg_ctrl_array;
	int ret;
	u8 mxl_mode;

	mxl_dbg("(freq = %d, bw = 0x%x)", freq, bw);

	/* stop tune */
	ret = mxl111sf_tuner_write_reg(state, START_TUNE_REG, 0);
	if (mxl_fail(ret))
		goto fail;

	/* check device mode */
	ret = mxl111sf_tuner_read_reg(state, MXL_MODE_REG, &mxl_mode);
	if (mxl_fail(ret))
		goto fail;

	/* Fill out registers for channel tune */
	reg_ctrl_array = mxl111sf_calc_phy_tune_regs(freq, bw);
	if (!reg_ctrl_array)
		return -EINVAL;

	ret = mxl111sf_tuner_program_regs(state, reg_ctrl_array);
	if (mxl_fail(ret))
		goto fail;

	if ((mxl_mode & MXL_DEV_MODE_MASK) == MXL_TUNER_MODE) {
		/* IF tuner mode only */
		mxl1x1sf_tuner_top_master_ctrl(state, 0);
		mxl1x1sf_tuner_top_master_ctrl(state, 1);
		mxl1x1sf_tuner_set_if_output_freq(state);
	}

	ret = mxl111sf_tuner_write_reg(state, START_TUNE_REG, 1);
	if (mxl_fail(ret))
		goto fail;

	if (state->cfg->ant_hunt)
		state->cfg->ant_hunt(fe);
fail:
	return ret;
}

static int mxl1x1sf_tuner_get_lock_status(struct mxl111sf_tuner_state *state,
					  int *rf_synth_lock,
					  int *ref_synth_lock)
{
	int ret;
	u8 data;

	*rf_synth_lock = 0;
	*ref_synth_lock = 0;

	ret = mxl111sf_tuner_read_reg(state, V6_RF_LOCK_STATUS_REG, &data);
	if (mxl_fail(ret))
		goto fail;

	*ref_synth_lock = ((data & 0x03) == 0x03) ? 1 : 0;
	*rf_synth_lock  = ((data & 0x0c) == 0x0c) ? 1 : 0;
fail:
	return ret;
}

#if 0
static int mxl1x1sf_tuner_loop_thru_ctrl(struct mxl111sf_tuner_state *state,
					 int onoff)
{
	return mxl111sf_tuner_write_reg(state, V6_TUNER_LOOP_THRU_CTRL_REG,
					onoff ? 1 : 0);
}
#endif

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

static int mxl111sf_tuner_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	u32 delsys  = c->delivery_system;
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	int ret;
	u8 bw;

	mxl_dbg("()");

	switch (delsys) {
	case SYS_ATSC:
		bw = 0; /* ATSC */
		break;
	case SYS_DVBC_ANNEX_B:
		bw = 1; /* US CABLE */
		break;
	case SYS_DVBT:
		switch (c->bandwidth_hz) {
		case 6000000:
			bw = 6;
			break;
		case 7000000:
			bw = 7;
			break;
		case 8000000:
			bw = 8;
			break;
		default:
			err("%s: bandwidth not set!", __func__);
			return -EINVAL;
		}
		break;
	default:
		err("%s: modulation type not supported!", __func__);
		return -EINVAL;
	}
	ret = mxl1x1sf_tune_rf(fe, c->frequency, bw);
	if (mxl_fail(ret))
		goto fail;

	state->frequency = c->frequency;
	state->bandwidth = c->bandwidth_hz;
fail:
	return ret;
}

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

#if 0
static int mxl111sf_tuner_init(struct dvb_frontend *fe)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	int ret;

	/* wake from standby handled by usb driver */

	return ret;
}

static int mxl111sf_tuner_sleep(struct dvb_frontend *fe)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	int ret;

	/* enter standby mode handled by usb driver */

	return ret;
}
#endif

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

static int mxl111sf_tuner_get_status(struct dvb_frontend *fe, u32 *status)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	int rf_locked, ref_locked, ret;

	*status = 0;

	ret = mxl1x1sf_tuner_get_lock_status(state, &rf_locked, &ref_locked);
	if (mxl_fail(ret))
		goto fail;
	mxl_info("%s%s", rf_locked ? "rf locked " : "",
		 ref_locked ? "ref locked" : "");

	if ((rf_locked) || (ref_locked))
		*status |= TUNER_STATUS_LOCKED;
fail:
	return ret;
}

static int mxl111sf_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	u8 val1, val2;
	int ret;

	*strength = 0;

	ret = mxl111sf_tuner_write_reg(state, 0x00, 0x02);
	if (mxl_fail(ret))
		goto fail;
	ret = mxl111sf_tuner_read_reg(state, V6_DIG_RF_PWR_LSB_REG, &val1);
	if (mxl_fail(ret))
		goto fail;
	ret = mxl111sf_tuner_read_reg(state, V6_DIG_RF_PWR_MSB_REG, &val2);
	if (mxl_fail(ret))
		goto fail;

	*strength = val1 | ((val2 & 0x07) << 8);
fail:
	ret = mxl111sf_tuner_write_reg(state, 0x00, 0x00);
	mxl_fail(ret);

	return ret;
}

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

static int mxl111sf_tuner_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	*frequency = state->frequency;
	return 0;
}

static int mxl111sf_tuner_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	*bandwidth = state->bandwidth;
	return 0;
}

static int mxl111sf_tuner_get_if_frequency(struct dvb_frontend *fe,
					   u32 *frequency)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;

	*frequency = 0;

	switch (state->if_freq) {
	case MXL_IF_4_0:   /* 4.0   MHz */
		*frequency = 4000000;
		break;
	case MXL_IF_4_5:   /* 4.5   MHz */
		*frequency = 4500000;
		break;
	case MXL_IF_4_57:  /* 4.57  MHz */
		*frequency = 4570000;
		break;
	case MXL_IF_5_0:   /* 5.0   MHz */
		*frequency = 5000000;
		break;
	case MXL_IF_5_38:  /* 5.38  MHz */
		*frequency = 5380000;
		break;
	case MXL_IF_6_0:   /* 6.0   MHz */
		*frequency = 6000000;
		break;
	case MXL_IF_6_28:  /* 6.28  MHz */
		*frequency = 6280000;
		break;
	case MXL_IF_7_2:   /* 7.2   MHz */
		*frequency = 7200000;
		break;
	case MXL_IF_35_25: /* 35.25 MHz */
		*frequency = 35250000;
		break;
	case MXL_IF_36:    /* 36    MHz */
		*frequency = 36000000;
		break;
	case MXL_IF_36_15: /* 36.15 MHz */
		*frequency = 36150000;
		break;
	case MXL_IF_44:    /* 44    MHz */
		*frequency = 44000000;
		break;
	}
	return 0;
}

static int mxl111sf_tuner_release(struct dvb_frontend *fe)
{
	struct mxl111sf_tuner_state *state = fe->tuner_priv;
	mxl_dbg("()");
	kfree(state);
	fe->tuner_priv = NULL;
	return 0;
}

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

static struct dvb_tuner_ops mxl111sf_tuner_tuner_ops = {
	.info = {
		.name = "MaxLinear MxL111SF",
#if 0
		.frequency_min  = ,
		.frequency_max  = ,
		.frequency_step = ,
#endif
	},
#if 0
	.init              = mxl111sf_tuner_init,
	.sleep             = mxl111sf_tuner_sleep,
#endif
	.set_params        = mxl111sf_tuner_set_params,
	.get_status        = mxl111sf_tuner_get_status,
	.get_rf_strength   = mxl111sf_get_rf_strength,
	.get_frequency     = mxl111sf_tuner_get_frequency,
	.get_bandwidth     = mxl111sf_tuner_get_bandwidth,
	.get_if_frequency  = mxl111sf_tuner_get_if_frequency,
	.release           = mxl111sf_tuner_release,
};

struct dvb_frontend *mxl111sf_tuner_attach(struct dvb_frontend *fe,
					   struct mxl111sf_state *mxl_state,
					   struct mxl111sf_tuner_config *cfg)
{
	struct mxl111sf_tuner_state *state = NULL;

	mxl_dbg("()");

	state = kzalloc(sizeof(struct mxl111sf_tuner_state), GFP_KERNEL);
	if (state == NULL)
		return NULL;

	state->mxl_state = mxl_state;
	state->cfg = cfg;

	memcpy(&fe->ops.tuner_ops, &mxl111sf_tuner_tuner_ops,
	       sizeof(struct dvb_tuner_ops));

	fe->tuner_priv = state;
	return fe;
}
EXPORT_SYMBOL_GPL(mxl111sf_tuner_attach);

MODULE_DESCRIPTION("MaxLinear MxL111SF CMOS tuner driver");
MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */