aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/dvb/frontends/cx24113.c
blob: c341d57d5e818d9c57d34e09e790eb937f0e5475 (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
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
/*
 *  Driver for Conexant CX24113/CX24128 Tuner (Satellite)
 *
 *  Copyright (C) 2007-8 Patrick Boettcher <pb@linuxtv.org>
 *
 *  Developed for BBTI / Technisat
 *
 *  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 <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include "dvb_frontend.h"
#include "cx24113.h"

static int debug;

#define cx_info(args...) do { printk(KERN_INFO "CX24113: " args); } while (0)
#define cx_err(args...)  do { printk(KERN_ERR  "CX24113: " args); } while (0)

#define dprintk(args...) \
	do { \
		if (debug) { \
			printk(KERN_DEBUG "CX24113: %s: ", __func__); \
			printk(args); \
		} \
	} while (0)

struct cx24113_state {
	struct i2c_adapter *i2c;
	const struct cx24113_config *config;

#define REV_CX24113 0x23
	u8 rev;
	u8 ver;

	u8 icp_mode:1;

#define ICP_LEVEL1 0
#define ICP_LEVEL2 1
#define ICP_LEVEL3 2
#define ICP_LEVEL4 3
	u8 icp_man:2;
	u8 icp_auto_low:2;
	u8 icp_auto_mlow:2;
	u8 icp_auto_mhi:2;
	u8 icp_auto_hi:2;
	u8 icp_dig;

#define LNA_MIN_GAIN 0
#define LNA_MID_GAIN 1
#define LNA_MAX_GAIN 2
	u8 lna_gain:2;

	u8 acp_on:1;

	u8 vco_mode:2;
	u8 vco_shift:1;
#define VCOBANDSEL_6 0x80
#define VCOBANDSEL_5 0x01
#define VCOBANDSEL_4 0x02
#define VCOBANDSEL_3 0x04
#define VCOBANDSEL_2 0x08
#define VCOBANDSEL_1 0x10
	u8 vco_band;

#define VCODIV4 4
#define VCODIV2 2
	u8 vcodiv;

	u8 bs_delay:4;
	u16 bs_freqcnt:13;
	u16 bs_rdiv;
	u8 prescaler_mode:1;

	u8 rfvga_bias_ctrl;

	s16 tuner_gain_thres;
	u8  gain_level;

	u32 frequency;

	u8 refdiv;

	u8 Fwindow_enabled;
};

static int cx24113_writereg(struct cx24113_state *state, int reg, int data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->i2c_addr,
		.flags = 0, .buf = buf, .len = 2 };
	int err = i2c_transfer(state->i2c, &msg, 1);
	if (err != 1) {
		printk(KERN_DEBUG "%s: writereg error(err == %i, reg == 0x%02x,"
			 " data == 0x%02x)\n", __func__, err, reg, data);
		return err;
	}

	return 0;
}

static int cx24113_readreg(struct cx24113_state *state, u8 reg)
{
	int ret;
	u8 b;
	struct i2c_msg msg[] = {
		{ .addr = state->config->i2c_addr,
			.flags = 0, .buf = &reg, .len = 1 },
		{ .addr = state->config->i2c_addr,
			.flags = I2C_M_RD, .buf = &b, .len = 1 }
	};

	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2) {
		printk(KERN_DEBUG "%s: reg=0x%x (error=%d)\n",
			__func__, reg, ret);
		return ret;
	}

	return b;
}

static void cx24113_set_parameters(struct cx24113_state *state)
{
	u8 r;

	r = cx24113_readreg(state, 0x10) & 0x82;
	r |= state->icp_mode;
	r |= state->icp_man << 4;
	r |= state->icp_dig << 2;
	r |= state->prescaler_mode << 5;
	cx24113_writereg(state, 0x10, r);

	r = (state->icp_auto_low  << 0) | (state->icp_auto_mlow << 2)
		| (state->icp_auto_mhi << 4) | (state->icp_auto_hi << 6);
	cx24113_writereg(state, 0x11, r);

	if (state->rev == REV_CX24113) {
		r = cx24113_readreg(state, 0x20) & 0xec;
		r |= state->lna_gain;
		r |= state->rfvga_bias_ctrl << 4;
		cx24113_writereg(state, 0x20, r);
	}

	r = cx24113_readreg(state, 0x12) & 0x03;
	r |= state->acp_on << 2;
	r |= state->bs_delay << 4;
	cx24113_writereg(state, 0x12, r);

	r = cx24113_readreg(state, 0x18) & 0x40;
	r |= state->vco_shift;
	if (state->vco_band == VCOBANDSEL_6)
		r |= (1 << 7);
	else
		r |= (state->vco_band << 1);
	cx24113_writereg(state, 0x18, r);

	r  = cx24113_readreg(state, 0x14) & 0x20;
	r |= (state->vco_mode << 6) | ((state->bs_freqcnt >> 8) & 0x1f);
	cx24113_writereg(state, 0x14, r);
	cx24113_writereg(state, 0x15, (state->bs_freqcnt        & 0xff));

	cx24113_writereg(state, 0x16, (state->bs_rdiv >> 4) & 0xff);
	r = (cx24113_readreg(state, 0x17) & 0x0f) |
		((state->bs_rdiv & 0x0f) << 4);
	cx24113_writereg(state, 0x17, r);
}

#define VGA_0 0x00
#define VGA_1 0x04
#define VGA_2 0x02
#define VGA_3 0x06
#define VGA_4 0x01
#define VGA_5 0x05
#define VGA_6 0x03
#define VGA_7 0x07

#define RFVGA_0 0x00
#define RFVGA_1 0x01
#define RFVGA_2 0x02
#define RFVGA_3 0x03

static int cx24113_set_gain_settings(struct cx24113_state *state,
		s16 power_estimation)
{
	u8 ampout = cx24113_readreg(state, 0x1d) & 0xf0,
	   vga    = cx24113_readreg(state, 0x1f) & 0x3f,
	   rfvga  = cx24113_readreg(state, 0x20) & 0xf3;
	u8 gain_level = power_estimation >= state->tuner_gain_thres;

	dprintk("power estimation: %d, thres: %d, gain_level: %d/%d\n",
			power_estimation, state->tuner_gain_thres,
			state->gain_level, gain_level);

	if (gain_level == state->gain_level)
		return 0; /* nothing to be done */

	ampout |= 0xf;

	if (gain_level) {
		rfvga |= RFVGA_0 << 2;
		vga   |= (VGA_7 << 3) | VGA_7;
	} else {
		rfvga |= RFVGA_2 << 2;
		vga  |= (VGA_6 << 3) | VGA_2;
	}
	state->gain_level = gain_level;

	cx24113_writereg(state, 0x1d, ampout);
	cx24113_writereg(state, 0x1f, vga);
	cx24113_writereg(state, 0x20, rfvga);

	return 1; /* did something */
}

static int cx24113_set_Fref(struct cx24113_state *state, u8 high)
{
	u8 xtal = cx24113_readreg(state, 0x02);
	if (state->rev == 0x43 && state->vcodiv == VCODIV4)
		high = 1;

	xtal &= ~0x2;
	if (high)
		xtal |= high << 1;
	return cx24113_writereg(state, 0x02, xtal);
}

static int cx24113_enable(struct cx24113_state *state, u8 enable)
{
	u8 r21 = (cx24113_readreg(state, 0x21) & 0xc0) | enable;
	if (state->rev == REV_CX24113)
		r21 |= (1 << 1);
	return cx24113_writereg(state, 0x21, r21);
}

static int cx24113_set_bandwidth(struct cx24113_state *state, u32 bandwidth_khz)
{
	u8 r;

	if (bandwidth_khz <= 19000)
		r = 0x03 << 6;
	else if (bandwidth_khz <= 25000)
		r = 0x02 << 6;
	else
		r = 0x01 << 6;

	dprintk("bandwidth to be set: %d\n", bandwidth_khz);
	bandwidth_khz *= 10;
	bandwidth_khz -= 10000;
	bandwidth_khz /= 1000;
	bandwidth_khz += 5;
	bandwidth_khz /= 10;

	dprintk("bandwidth: %d %d\n", r >> 6, bandwidth_khz);

	r |= bandwidth_khz & 0x3f;

	return cx24113_writereg(state, 0x1e, r);
}

static int cx24113_set_clk_inversion(struct cx24113_state *state, u8 on)
{
	u8 r = (cx24113_readreg(state, 0x10) & 0x7f) | ((on & 0x1) << 7);
	return cx24113_writereg(state, 0x10, r);
}

static int cx24113_get_status(struct dvb_frontend *fe, u32 *status)
{
	struct cx24113_state *state = fe->tuner_priv;
	u8 r = (cx24113_readreg(state, 0x10) & 0x02) >> 1;
	if (r)
		*status |= TUNER_STATUS_LOCKED;
	dprintk("PLL locked: %d\n", r);
	return 0;
}

static u8 cx24113_set_ref_div(struct cx24113_state *state, u8 refdiv)
{
	if (state->rev == 0x43 && state->vcodiv == VCODIV4)
		refdiv = 2;
	return state->refdiv = refdiv;
}

static void cx24113_calc_pll_nf(struct cx24113_state *state, u16 *n, s32 *f)
{
	s32 N;
	s64 F;
	u64 dividend;
	u8 R, r;
	u8 vcodiv;
	u8 factor;
	s32 freq_hz = state->frequency * 1000;

	if (state->config->xtal_khz < 20000)
		factor = 1;
	else
		factor = 2;

	if (state->rev == REV_CX24113) {
		if (state->frequency >= 1100000)
			vcodiv = VCODIV2;
		else
			vcodiv = VCODIV4;
	} else {
		if (state->frequency >= 1165000)
			vcodiv = VCODIV2;
		else
			vcodiv = VCODIV4;
	}
	state->vcodiv = vcodiv;

	dprintk("calculating N/F for %dHz with vcodiv %d\n", freq_hz, vcodiv);
	R = 0;
	do {
		R = cx24113_set_ref_div(state, R + 1);

		/* calculate tuner PLL settings: */
		N =  (freq_hz / 100 * vcodiv) * R;
		N /= (state->config->xtal_khz) * factor * 2;
		N += 5;     /* For round up. */
		N /= 10;
		N -= 32;
	} while (N < 6 && R < 3);

	if (N < 6) {
		cx_err("strange frequency: N < 6\n");
		return;
	}
	F = freq_hz;
	F *= (u64) (R * vcodiv * 262144);
	dprintk("1 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
	/* do_div needs an u64 as first argument */
	dividend = F;
	do_div(dividend, state->config->xtal_khz * 1000 * factor * 2);
	F = dividend;
	dprintk("2 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
	F -= (N + 32) * 262144;

	dprintk("3 N: %d, F: %lld, R: %d\n", N, (long long)F, R);

	if (state->Fwindow_enabled) {
		if (F > (262144 / 2 - 1638))
			F = 262144 / 2 - 1638;
		if (F < (-262144 / 2 + 1638))
			F = -262144 / 2 + 1638;
		if ((F < 3277 && F > 0) || (F > -3277 && F < 0)) {
			F = 0;
			r = cx24113_readreg(state, 0x10);
			cx24113_writereg(state, 0x10, r | (1 << 6));
		}
	}
	dprintk("4 N: %d, F: %lld, R: %d\n", N, (long long)F, R);

	*n = (u16) N;
	*f = (s32) F;
}


static void cx24113_set_nfr(struct cx24113_state *state, u16 n, s32 f, u8 r)
{
	u8 reg;
	cx24113_writereg(state, 0x19, (n >> 1) & 0xff);

	reg = ((n & 0x1) << 7) | ((f >> 11) & 0x7f);
	cx24113_writereg(state, 0x1a, reg);

	cx24113_writereg(state, 0x1b, (f >> 3) & 0xff);

	reg = cx24113_readreg(state, 0x1c) & 0x1f;
	cx24113_writereg(state, 0x1c, reg | ((f & 0x7) << 5));

	cx24113_set_Fref(state, r - 1);
}

static int cx24113_set_frequency(struct cx24113_state *state, u32 frequency)
{
	u8 r = 1; /* or 2 */
	u16 n = 6;
	s32 f = 0;

	r = cx24113_readreg(state, 0x14);
	cx24113_writereg(state, 0x14, r & 0x3f);

	r = cx24113_readreg(state, 0x10);
	cx24113_writereg(state, 0x10, r & 0xbf);

	state->frequency = frequency;

	dprintk("tuning to frequency: %d\n", frequency);

	cx24113_calc_pll_nf(state, &n, &f);
	cx24113_set_nfr(state, n, f, state->refdiv);

	r = cx24113_readreg(state, 0x18) & 0xbf;
	if (state->vcodiv != VCODIV2)
		r |= 1 << 6;
	cx24113_writereg(state, 0x18, r);

	/* The need for this sleep is not clear. But helps in some cases */
	msleep(5);

	r = cx24113_readreg(state, 0x1c) & 0xef;
	cx24113_writereg(state, 0x1c, r | (1 << 4));
	return 0;
}

static int cx24113_init(struct dvb_frontend *fe)
{
	struct cx24113_state *state = fe->tuner_priv;
	int ret;

	state->tuner_gain_thres = -50;
	state->gain_level = 255; /* to force a gain-setting initialization */
	state->icp_mode = 0;

	if (state->config->xtal_khz < 11000) {
		state->icp_auto_hi  = ICP_LEVEL4;
		state->icp_auto_mhi  = ICP_LEVEL4;
		state->icp_auto_mlow = ICP_LEVEL3;
		state->icp_auto_low = ICP_LEVEL3;
	} else {
		state->icp_auto_hi  = ICP_LEVEL4;
		state->icp_auto_mhi  = ICP_LEVEL4;
		state->icp_auto_mlow = ICP_LEVEL3;
		state->icp_auto_low = ICP_LEVEL2;
	}

	state->icp_dig = ICP_LEVEL3;
	state->icp_man = ICP_LEVEL1;
	state->acp_on  = 1;
	state->vco_mode = 0;
	state->vco_shift = 0;
	state->vco_band = VCOBANDSEL_1;
	state->bs_delay = 8;
	state->bs_freqcnt = 0x0fff;
	state->bs_rdiv = 0x0fff;
	state->prescaler_mode = 0;
	state->lna_gain = LNA_MAX_GAIN;
	state->rfvga_bias_ctrl = 1;
	state->Fwindow_enabled = 1;

	cx24113_set_Fref(state, 0);
	cx24113_enable(state, 0x3d);
	cx24113_set_parameters(state);

	cx24113_set_gain_settings(state, -30);

	cx24113_set_bandwidth(state, 18025);
	cx24113_set_clk_inversion(state, 1);

	if (state->config->xtal_khz >= 40000)
		ret = cx24113_writereg(state, 0x02,
			(cx24113_readreg(state, 0x02) & 0xfb) | (1 << 2));
	else
		ret = cx24113_writereg(state, 0x02,
			(cx24113_readreg(state, 0x02) & 0xfb) | (0 << 2));

	return ret;
}

static int cx24113_set_params(struct dvb_frontend *fe,
		struct dvb_frontend_parameters *p)
{
	struct cx24113_state *state = fe->tuner_priv;
	/* for a ROLL-OFF factor of 0.35, 0.2: 600, 0.25: 625 */
	u32 roll_off = 675;
	u32 bw;

	bw  = ((p->u.qpsk.symbol_rate/100) * roll_off) / 1000;
	bw += (10000000/100) + 5;
	bw /= 10;
	bw += 1000;
	cx24113_set_bandwidth(state, bw);

	cx24113_set_frequency(state, p->frequency);
	msleep(5);
	return cx24113_get_status(fe, &bw);
}

static s8 cx24113_agc_table[2][10] = {
	{-54, -41, -35, -30, -25, -21, -16, -10,  -6,  -2},
	{-39, -35, -30, -25, -19, -15, -11,  -5,   1,   9},
};

void cx24113_agc_callback(struct dvb_frontend *fe)
{
	struct cx24113_state *state = fe->tuner_priv;
	s16 s, i;
	if (!fe->ops.read_signal_strength)
		return;

	do {
		/* this only works with the current CX24123 implementation */
		fe->ops.read_signal_strength(fe, (u16 *) &s);
		s >>= 8;
		dprintk("signal strength: %d\n", s);
		for (i = 0; i < sizeof(cx24113_agc_table[0]); i++)
			if (cx24113_agc_table[state->gain_level][i] > s)
				break;
		s = -25 - i*5;
	} while (cx24113_set_gain_settings(state, s));
}
EXPORT_SYMBOL(cx24113_agc_callback);

static int cx24113_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct cx24113_state *state = fe->tuner_priv;
	*frequency = state->frequency;
	return 0;
}

static int cx24113_release(struct dvb_frontend *fe)
{
	struct cx24113_state *state = fe->tuner_priv;
	dprintk("\n");
	fe->tuner_priv = NULL;
	kfree(state);
	return 0;
}

static const struct dvb_tuner_ops cx24113_tuner_ops = {
	.info = {
		.name           = "Conexant CX24113",
		.frequency_min  = 950000,
		.frequency_max  = 2150000,
		.frequency_step = 125,
	},

	.release       = cx24113_release,

	.init          = cx24113_init,
	.sleep         = NULL,

	.set_params    = cx24113_set_params,
	.get_frequency = cx24113_get_frequency,
	.get_bandwidth = NULL,
	.get_status    = cx24113_get_status,
};

struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
		const struct cx24113_config *config, struct i2c_adapter *i2c)
{
	/* allocate memory for the internal state */
	struct cx24113_state *state =
		kzalloc(sizeof(struct cx24113_state), GFP_KERNEL);
	int rc;
	if (state == NULL) {
		cx_err("Unable to kzalloc\n");
		goto error;
	}

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	cx_info("trying to detect myself\n");

	/* making a dummy read, because of some expected troubles
	 * after power on */
	cx24113_readreg(state, 0x00);

	rc = cx24113_readreg(state, 0x00);
	if (rc < 0) {
		cx_info("CX24113 not found.\n");
		goto error;
	}
	state->rev = rc;

	switch (rc) {
	case 0x43:
		cx_info("detected CX24113 variant\n");
		break;
	case REV_CX24113:
		cx_info("successfully detected\n");
		break;
	default:
		cx_err("unsupported device id: %x\n", state->rev);
		goto error;
	}
	state->ver = cx24113_readreg(state, 0x01);
	cx_info("version: %x\n", state->ver);

	/* create dvb_frontend */
	memcpy(&fe->ops.tuner_ops, &cx24113_tuner_ops,
			sizeof(struct dvb_tuner_ops));
	fe->tuner_priv = state;
	return fe;

error:
	kfree(state);

	return NULL;
}
EXPORT_SYMBOL(cx24113_attach);

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");

MODULE_AUTHOR("Patrick Boettcher <pb@linuxtv.org>");
MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24113/CX24128hardware");
MODULE_LICENSE("GPL");