summaryrefslogtreecommitdiff
path: root/drivers/media/dvb-frontends/stv6110.c
blob: 1cf9c095dbff02ca62382193c1bf4549336f3df1 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * stv6110.c
 *
 * Driver for ST STV6110 satellite tuner IC.
 *
 * Copyright (C) 2009 NetUP Inc.
 * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
 */

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

#include <linux/types.h>

#include "stv6110.h"

/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE  64

static int debug;

struct stv6110_priv {
	int i2c_address;
	struct i2c_adapter *i2c;

	u32 mclk;
	u8 clk_div;
	u8 gain;
	u8 regs[8];
};

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

static s32 abssub(s32 a, s32 b)
{
	if (a > b)
		return a - b;
	else
		return b - a;
};

static void stv6110_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
}

static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
							int start, int len)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	int rc;
	u8 cmdbuf[MAX_XFER_SIZE];
	struct i2c_msg msg = {
		.addr	= priv->i2c_address,
		.flags	= 0,
		.buf	= cmdbuf,
		.len	= len + 1
	};

	dprintk("%s\n", __func__);

	if (1 + len > sizeof(cmdbuf)) {
		printk(KERN_WARNING
		       "%s: i2c wr: len=%d is too big!\n",
		       KBUILD_MODNAME, len);
		return -EINVAL;
	}

	if (start + len > 8)
		return -EINVAL;

	memcpy(&cmdbuf[1], buf, len);
	cmdbuf[0] = start;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	rc = i2c_transfer(priv->i2c, &msg, 1);
	if (rc != 1)
		dprintk("%s: i2c error\n", __func__);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	return 0;
}

static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
							int start, int len)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	int rc;
	u8 reg[] = { start };
	struct i2c_msg msg[] = {
		{
			.addr	= priv->i2c_address,
			.flags	= 0,
			.buf	= reg,
			.len	= 1,
		}, {
			.addr	= priv->i2c_address,
			.flags	= I2C_M_RD,
			.buf	= regs,
			.len	= len,
		},
	};

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	rc = i2c_transfer(priv->i2c, msg, 2);
	if (rc != 2)
		dprintk("%s: i2c error\n", __func__);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	memcpy(&priv->regs[start], regs, len);

	return 0;
}

static int stv6110_read_reg(struct dvb_frontend *fe, int start)
{
	u8 buf[] = { 0 };
	stv6110_read_regs(fe, buf, start, 1);

	return buf[0];
}

static int stv6110_sleep(struct dvb_frontend *fe)
{
	u8 reg[] = { 0 };
	stv6110_write_regs(fe, reg, 0, 1);

	return 0;
}

static u32 carrier_width(u32 symbol_rate, enum fe_rolloff rolloff)
{
	u32 rlf;

	switch (rolloff) {
	case ROLLOFF_20:
		rlf = 20;
		break;
	case ROLLOFF_25:
		rlf = 25;
		break;
	default:
		rlf = 35;
		break;
	}

	return symbol_rate  + ((symbol_rate * rlf) / 100);
}

static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	u8 r8, ret = 0x04;
	int i;

	if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
		r8 = 31;
	else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
		r8 = 0;
	else /*if 5 < BW/2 < 36*/
		r8 = (bandwidth / 2) / 1000000 - 5;

	/* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
	/* ctrl3, CF = r8 Set the LPF value */
	priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
	priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
	stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
	/* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
	priv->regs[RSTV6110_STAT1] |= 0x02;
	stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);

	i = 0;
	/* Wait for CALRCSTRT == 0 */
	while ((i < 10) && (ret != 0)) {
		ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
		mdelay(1);	/* wait for LPF auto calibration */
		i++;
	}

	/* RCCLKOFF = 1 calibration done, deactivate the calibration Clock */
	priv->regs[RSTV6110_CTRL3] |= (1 << 6);
	stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
	return 0;
}

static int stv6110_init(struct dvb_frontend *fe)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };

	memcpy(priv->regs, buf0, 8);
	/* K = (Reference / 1000000) - 16 */
	priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
	priv->regs[RSTV6110_CTRL1] |=
				((((priv->mclk / 1000000) - 16) & 0x1f) << 3);

	/* divisor value for the output clock */
	priv->regs[RSTV6110_CTRL2] &= ~0xc0;
	priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);

	stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
	msleep(1);
	stv6110_set_bandwidth(fe, 72000000);

	return 0;
}

static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	u32 nbsteps, divider, psd2, freq;
	u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	stv6110_read_regs(fe, regs, 0, 8);
	/*N*/
	divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
	divider += priv->regs[RSTV6110_TUNING1];

	/*R*/
	nbsteps  = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
	/*p*/
	psd2  = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;

	freq = divider * (priv->mclk / 1000);
	freq /= (1 << (nbsteps + psd2));
	freq /= 4;

	*frequency = freq;

	return 0;
}

static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	u8 ret = 0x04;
	u32 divider, ref, p, presc, i, result_freq, vco_freq;
	s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;

	dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
						frequency, priv->mclk);

	/* K = (Reference / 1000000) - 16 */
	priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
	priv->regs[RSTV6110_CTRL1] |=
				((((priv->mclk / 1000000) - 16) & 0x1f) << 3);

	/* BB_GAIN = db/2 */
	priv->regs[RSTV6110_CTRL2] &= ~0x0f;
	priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);

	if (frequency <= 1023000) {
		p = 1;
		presc = 0;
	} else if (frequency <= 1300000) {
		p = 1;
		presc = 1;
	} else if (frequency <= 2046000) {
		p = 0;
		presc = 0;
	} else {
		p = 0;
		presc = 1;
	}
	/* DIV4SEL = p*/
	priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
	priv->regs[RSTV6110_TUNING2] |= (p << 4);

	/* PRESC32ON = presc */
	priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
	priv->regs[RSTV6110_TUNING2] |= (presc << 5);

	p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
	for (r_div = 0; r_div <= 3; r_div++) {
		p_calc = (priv->mclk / 100000);
		p_calc /= (1 << (r_div + 1));
		if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
			r_div_opt = r_div;

		p_calc_opt = (priv->mclk / 100000);
		p_calc_opt /= (1 << (r_div_opt + 1));
	}

	ref = priv->mclk / ((1 << (r_div_opt + 1))  * (1 << (p + 1)));
	divider = (((frequency * 1000) + (ref >> 1)) / ref);

	/* RDIV = r_div_opt */
	priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
	priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);

	/* NDIV_MSB = MSB(divider) */
	priv->regs[RSTV6110_TUNING2] &= ~0x0f;
	priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);

	/* NDIV_LSB, LSB(divider) */
	priv->regs[RSTV6110_TUNING1] = (divider & 0xff);

	/* CALVCOSTRT = 1 VCO Auto Calibration */
	priv->regs[RSTV6110_STAT1] |= 0x04;
	stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
						RSTV6110_CTRL1, 8);

	i = 0;
	/* Wait for CALVCOSTRT == 0 */
	while ((i < 10) && (ret != 0)) {
		ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
		msleep(1); /* wait for VCO auto calibration */
		i++;
	}

	ret = stv6110_read_reg(fe, RSTV6110_STAT1);
	stv6110_get_frequency(fe, &result_freq);

	vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
	dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
						ret, result_freq, vco_freq);

	return 0;
}

static int stv6110_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);

	stv6110_set_frequency(fe, c->frequency);
	stv6110_set_bandwidth(fe, bandwidth);

	return 0;
}

static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
	struct stv6110_priv *priv = fe->tuner_priv;
	u8 r8 = 0;
	u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
	stv6110_read_regs(fe, regs, 0, 8);

	/* CF */
	r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
	*bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */

	return 0;
}

static const struct dvb_tuner_ops stv6110_tuner_ops = {
	.info = {
		.name = "ST STV6110",
		.frequency_min_hz  =  950 * MHz,
		.frequency_max_hz  = 2150 * MHz,
		.frequency_step_hz =    1 * MHz,
	},
	.init = stv6110_init,
	.release = stv6110_release,
	.sleep = stv6110_sleep,
	.set_params = stv6110_set_params,
	.get_frequency = stv6110_get_frequency,
	.set_frequency = stv6110_set_frequency,
	.get_bandwidth = stv6110_get_bandwidth,
	.set_bandwidth = stv6110_set_bandwidth,

};

struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
					const struct stv6110_config *config,
					struct i2c_adapter *i2c)
{
	struct stv6110_priv *priv = NULL;
	u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };

	struct i2c_msg msg[] = {
		{
			.addr = config->i2c_address,
			.flags = 0,
			.buf = reg0,
			.len = 9
		}
	};
	int ret;

	/* divisor value for the output clock */
	reg0[2] &= ~0xc0;
	reg0[2] |= (config->clk_div << 6);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	ret = i2c_transfer(i2c, msg, 1);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	if (ret != 1)
		return NULL;

	priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	priv->i2c_address = config->i2c_address;
	priv->i2c = i2c;
	priv->mclk = config->mclk;
	priv->clk_div = config->clk_div;
	priv->gain = config->gain;

	memcpy(&priv->regs, &reg0[1], 8);

	memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
				sizeof(struct dvb_tuner_ops));
	fe->tuner_priv = priv;
	printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);

	return fe;
}
EXPORT_SYMBOL_GPL(stv6110_attach);

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

MODULE_DESCRIPTION("ST STV6110 driver");
MODULE_AUTHOR("Igor M. Liplianin");
MODULE_LICENSE("GPL");