1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Realtek RTL2830 DVB-T demodulator driver
4  *
5  * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
6  */
7 
8 #include "rtl2830_priv.h"
9 
10 /* Our regmap is bypassing I2C adapter lock, thus we do it! */
11 static int rtl2830_bulk_write(struct i2c_client *client, unsigned int reg,
12 			      const void *val, size_t val_count)
13 {
14 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
15 	int ret;
16 
17 	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
18 	ret = regmap_bulk_write(dev->regmap, reg, val, val_count);
19 	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
20 	return ret;
21 }
22 
23 static int rtl2830_update_bits(struct i2c_client *client, unsigned int reg,
24 			       unsigned int mask, unsigned int val)
25 {
26 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
27 	int ret;
28 
29 	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
30 	ret = regmap_update_bits(dev->regmap, reg, mask, val);
31 	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
32 	return ret;
33 }
34 
35 static int rtl2830_bulk_read(struct i2c_client *client, unsigned int reg,
36 			     void *val, size_t val_count)
37 {
38 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
39 	int ret;
40 
41 	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
42 	ret = regmap_bulk_read(dev->regmap, reg, val, val_count);
43 	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
44 	return ret;
45 }
46 
47 static int rtl2830_init(struct dvb_frontend *fe)
48 {
49 	struct i2c_client *client = fe->demodulator_priv;
50 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
51 	struct dtv_frontend_properties *c = &dev->fe.dtv_property_cache;
52 	int ret, i;
53 	struct rtl2830_reg_val_mask tab[] = {
54 		{0x00d, 0x01, 0x03},
55 		{0x00d, 0x10, 0x10},
56 		{0x104, 0x00, 0x1e},
57 		{0x105, 0x80, 0x80},
58 		{0x110, 0x02, 0x03},
59 		{0x110, 0x08, 0x0c},
60 		{0x17b, 0x00, 0x40},
61 		{0x17d, 0x05, 0x0f},
62 		{0x17d, 0x50, 0xf0},
63 		{0x18c, 0x08, 0x0f},
64 		{0x18d, 0x00, 0xc0},
65 		{0x188, 0x05, 0x0f},
66 		{0x189, 0x00, 0xfc},
67 		{0x2d5, 0x02, 0x02},
68 		{0x2f1, 0x02, 0x06},
69 		{0x2f1, 0x20, 0xf8},
70 		{0x16d, 0x00, 0x01},
71 		{0x1a6, 0x00, 0x80},
72 		{0x106, dev->pdata->vtop, 0x3f},
73 		{0x107, dev->pdata->krf, 0x3f},
74 		{0x112, 0x28, 0xff},
75 		{0x103, dev->pdata->agc_targ_val, 0xff},
76 		{0x00a, 0x02, 0x07},
77 		{0x140, 0x0c, 0x3c},
78 		{0x140, 0x40, 0xc0},
79 		{0x15b, 0x05, 0x07},
80 		{0x15b, 0x28, 0x38},
81 		{0x15c, 0x05, 0x07},
82 		{0x15c, 0x28, 0x38},
83 		{0x115, dev->pdata->spec_inv, 0x01},
84 		{0x16f, 0x01, 0x07},
85 		{0x170, 0x18, 0x38},
86 		{0x172, 0x0f, 0x0f},
87 		{0x173, 0x08, 0x38},
88 		{0x175, 0x01, 0x07},
89 		{0x176, 0x00, 0xc0},
90 	};
91 
92 	for (i = 0; i < ARRAY_SIZE(tab); i++) {
93 		ret = rtl2830_update_bits(client, tab[i].reg, tab[i].mask,
94 					  tab[i].val);
95 		if (ret)
96 			goto err;
97 	}
98 
99 	ret = rtl2830_bulk_write(client, 0x18f, "\x28\x00", 2);
100 	if (ret)
101 		goto err;
102 
103 	ret = rtl2830_bulk_write(client, 0x195,
104 				 "\x04\x06\x0a\x12\x0a\x12\x1e\x28", 8);
105 	if (ret)
106 		goto err;
107 
108 	/* TODO: spec init */
109 
110 	/* soft reset */
111 	ret = rtl2830_update_bits(client, 0x101, 0x04, 0x04);
112 	if (ret)
113 		goto err;
114 
115 	ret = rtl2830_update_bits(client, 0x101, 0x04, 0x00);
116 	if (ret)
117 		goto err;
118 
119 	/* init stats here in order signal app which stats are supported */
120 	c->strength.len = 1;
121 	c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
122 	c->cnr.len = 1;
123 	c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
124 	c->post_bit_error.len = 1;
125 	c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
126 	c->post_bit_count.len = 1;
127 	c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
128 
129 	dev->sleeping = false;
130 
131 	return ret;
132 err:
133 	dev_dbg(&client->dev, "failed=%d\n", ret);
134 	return ret;
135 }
136 
137 static int rtl2830_sleep(struct dvb_frontend *fe)
138 {
139 	struct i2c_client *client = fe->demodulator_priv;
140 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
141 
142 	dev->sleeping = true;
143 	dev->fe_status = 0;
144 
145 	return 0;
146 }
147 
148 static int rtl2830_get_tune_settings(struct dvb_frontend *fe,
149 				     struct dvb_frontend_tune_settings *s)
150 {
151 	s->min_delay_ms = 500;
152 	s->step_size = fe->ops.info.frequency_stepsize_hz * 2;
153 	s->max_drift = (fe->ops.info.frequency_stepsize_hz * 2) + 1;
154 
155 	return 0;
156 }
157 
158 static int rtl2830_set_frontend(struct dvb_frontend *fe)
159 {
160 	struct i2c_client *client = fe->demodulator_priv;
161 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
162 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
163 	int ret, i;
164 	u64 num;
165 	u8 buf[3], u8tmp;
166 	u32 if_ctl, if_frequency;
167 	static const u8 bw_params1[3][34] = {
168 		{
169 		0x1f, 0xf0, 0x1f, 0xf0, 0x1f, 0xfa, 0x00, 0x17, 0x00, 0x41,
170 		0x00, 0x64, 0x00, 0x67, 0x00, 0x38, 0x1f, 0xde, 0x1f, 0x7a,
171 		0x1f, 0x47, 0x1f, 0x7c, 0x00, 0x30, 0x01, 0x4b, 0x02, 0x82,
172 		0x03, 0x73, 0x03, 0xcf, /* 6 MHz */
173 		}, {
174 		0x1f, 0xfa, 0x1f, 0xda, 0x1f, 0xc1, 0x1f, 0xb3, 0x1f, 0xca,
175 		0x00, 0x07, 0x00, 0x4d, 0x00, 0x6d, 0x00, 0x40, 0x1f, 0xca,
176 		0x1f, 0x4d, 0x1f, 0x2a, 0x1f, 0xb2, 0x00, 0xec, 0x02, 0x7e,
177 		0x03, 0xd0, 0x04, 0x53, /* 7 MHz */
178 		}, {
179 		0x00, 0x10, 0x00, 0x0e, 0x1f, 0xf7, 0x1f, 0xc9, 0x1f, 0xa0,
180 		0x1f, 0xa6, 0x1f, 0xec, 0x00, 0x4e, 0x00, 0x7d, 0x00, 0x3a,
181 		0x1f, 0x98, 0x1f, 0x10, 0x1f, 0x40, 0x00, 0x75, 0x02, 0x5f,
182 		0x04, 0x24, 0x04, 0xdb, /* 8 MHz */
183 		},
184 	};
185 	static const u8 bw_params2[3][6] = {
186 		{0xc3, 0x0c, 0x44, 0x33, 0x33, 0x30}, /* 6 MHz */
187 		{0xb8, 0xe3, 0x93, 0x99, 0x99, 0x98}, /* 7 MHz */
188 		{0xae, 0xba, 0xf3, 0x26, 0x66, 0x64}, /* 8 MHz */
189 	};
190 
191 	dev_dbg(&client->dev, "frequency=%u bandwidth_hz=%u inversion=%u\n",
192 		c->frequency, c->bandwidth_hz, c->inversion);
193 
194 	/* program tuner */
195 	if (fe->ops.tuner_ops.set_params)
196 		fe->ops.tuner_ops.set_params(fe);
197 
198 	switch (c->bandwidth_hz) {
199 	case 6000000:
200 		i = 0;
201 		break;
202 	case 7000000:
203 		i = 1;
204 		break;
205 	case 8000000:
206 		i = 2;
207 		break;
208 	default:
209 		dev_err(&client->dev, "invalid bandwidth_hz %u\n",
210 			c->bandwidth_hz);
211 		return -EINVAL;
212 	}
213 
214 	ret = rtl2830_update_bits(client, 0x008, 0x06, i << 1);
215 	if (ret)
216 		goto err;
217 
218 	/* program if frequency */
219 	if (fe->ops.tuner_ops.get_if_frequency)
220 		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
221 	else
222 		ret = -EINVAL;
223 	if (ret)
224 		goto err;
225 
226 	num = if_frequency % dev->pdata->clk;
227 	num *= 0x400000;
228 	num = div_u64(num, dev->pdata->clk);
229 	num = -num;
230 	if_ctl = num & 0x3fffff;
231 	dev_dbg(&client->dev, "if_frequency=%d if_ctl=%08x\n",
232 		if_frequency, if_ctl);
233 
234 	buf[0] = (if_ctl >> 16) & 0x3f;
235 	buf[1] = (if_ctl >>  8) & 0xff;
236 	buf[2] = (if_ctl >>  0) & 0xff;
237 
238 	ret = rtl2830_bulk_read(client, 0x119, &u8tmp, 1);
239 	if (ret)
240 		goto err;
241 
242 	buf[0] |= u8tmp & 0xc0;  /* [7:6] */
243 
244 	ret = rtl2830_bulk_write(client, 0x119, buf, 3);
245 	if (ret)
246 		goto err;
247 
248 	/* 1/2 split I2C write */
249 	ret = rtl2830_bulk_write(client, 0x11c, &bw_params1[i][0], 17);
250 	if (ret)
251 		goto err;
252 
253 	/* 2/2 split I2C write */
254 	ret = rtl2830_bulk_write(client, 0x12d, &bw_params1[i][17], 17);
255 	if (ret)
256 		goto err;
257 
258 	ret = rtl2830_bulk_write(client, 0x19d, bw_params2[i], 6);
259 	if (ret)
260 		goto err;
261 
262 	return ret;
263 err:
264 	dev_dbg(&client->dev, "failed=%d\n", ret);
265 	return ret;
266 }
267 
268 static int rtl2830_get_frontend(struct dvb_frontend *fe,
269 				struct dtv_frontend_properties *c)
270 {
271 	struct i2c_client *client = fe->demodulator_priv;
272 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
273 	int ret;
274 	u8 buf[3];
275 
276 	if (dev->sleeping)
277 		return 0;
278 
279 	ret = rtl2830_bulk_read(client, 0x33c, buf, 2);
280 	if (ret)
281 		goto err;
282 
283 	ret = rtl2830_bulk_read(client, 0x351, &buf[2], 1);
284 	if (ret)
285 		goto err;
286 
287 	dev_dbg(&client->dev, "TPS=%*ph\n", 3, buf);
288 
289 	switch ((buf[0] >> 2) & 3) {
290 	case 0:
291 		c->modulation = QPSK;
292 		break;
293 	case 1:
294 		c->modulation = QAM_16;
295 		break;
296 	case 2:
297 		c->modulation = QAM_64;
298 		break;
299 	}
300 
301 	switch ((buf[2] >> 2) & 1) {
302 	case 0:
303 		c->transmission_mode = TRANSMISSION_MODE_2K;
304 		break;
305 	case 1:
306 		c->transmission_mode = TRANSMISSION_MODE_8K;
307 	}
308 
309 	switch ((buf[2] >> 0) & 3) {
310 	case 0:
311 		c->guard_interval = GUARD_INTERVAL_1_32;
312 		break;
313 	case 1:
314 		c->guard_interval = GUARD_INTERVAL_1_16;
315 		break;
316 	case 2:
317 		c->guard_interval = GUARD_INTERVAL_1_8;
318 		break;
319 	case 3:
320 		c->guard_interval = GUARD_INTERVAL_1_4;
321 		break;
322 	}
323 
324 	switch ((buf[0] >> 4) & 7) {
325 	case 0:
326 		c->hierarchy = HIERARCHY_NONE;
327 		break;
328 	case 1:
329 		c->hierarchy = HIERARCHY_1;
330 		break;
331 	case 2:
332 		c->hierarchy = HIERARCHY_2;
333 		break;
334 	case 3:
335 		c->hierarchy = HIERARCHY_4;
336 		break;
337 	}
338 
339 	switch ((buf[1] >> 3) & 7) {
340 	case 0:
341 		c->code_rate_HP = FEC_1_2;
342 		break;
343 	case 1:
344 		c->code_rate_HP = FEC_2_3;
345 		break;
346 	case 2:
347 		c->code_rate_HP = FEC_3_4;
348 		break;
349 	case 3:
350 		c->code_rate_HP = FEC_5_6;
351 		break;
352 	case 4:
353 		c->code_rate_HP = FEC_7_8;
354 		break;
355 	}
356 
357 	switch ((buf[1] >> 0) & 7) {
358 	case 0:
359 		c->code_rate_LP = FEC_1_2;
360 		break;
361 	case 1:
362 		c->code_rate_LP = FEC_2_3;
363 		break;
364 	case 2:
365 		c->code_rate_LP = FEC_3_4;
366 		break;
367 	case 3:
368 		c->code_rate_LP = FEC_5_6;
369 		break;
370 	case 4:
371 		c->code_rate_LP = FEC_7_8;
372 		break;
373 	}
374 
375 	return 0;
376 err:
377 	dev_dbg(&client->dev, "failed=%d\n", ret);
378 	return ret;
379 }
380 
381 static int rtl2830_read_status(struct dvb_frontend *fe, enum fe_status *status)
382 {
383 	struct i2c_client *client = fe->demodulator_priv;
384 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
385 	struct dtv_frontend_properties *c = &dev->fe.dtv_property_cache;
386 	int ret, stmp;
387 	unsigned int utmp;
388 	u8 u8tmp, buf[2];
389 
390 	*status = 0;
391 
392 	if (dev->sleeping)
393 		return 0;
394 
395 	ret = rtl2830_bulk_read(client, 0x351, &u8tmp, 1);
396 	if (ret)
397 		goto err;
398 
399 	u8tmp = (u8tmp >> 3) & 0x0f; /* [6:3] */
400 	if (u8tmp == 11) {
401 		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
402 			FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
403 	} else if (u8tmp == 10) {
404 		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
405 			FE_HAS_VITERBI;
406 	}
407 
408 	dev->fe_status = *status;
409 
410 	/* Signal strength */
411 	if (dev->fe_status & FE_HAS_SIGNAL) {
412 		/* Read IF AGC */
413 		ret = rtl2830_bulk_read(client, 0x359, buf, 2);
414 		if (ret)
415 			goto err;
416 
417 		stmp = buf[0] << 8 | buf[1] << 0;
418 		stmp = sign_extend32(stmp, 13);
419 		utmp = clamp_val(-4 * stmp + 32767, 0x0000, 0xffff);
420 
421 		dev_dbg(&client->dev, "IF AGC=%d\n", stmp);
422 
423 		c->strength.stat[0].scale = FE_SCALE_RELATIVE;
424 		c->strength.stat[0].uvalue = utmp;
425 	} else {
426 		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
427 	}
428 
429 	/* CNR */
430 	if (dev->fe_status & FE_HAS_VITERBI) {
431 		unsigned int hierarchy, constellation;
432 		#define CONSTELLATION_NUM 3
433 		#define HIERARCHY_NUM 4
434 		static const u32 constant[CONSTELLATION_NUM][HIERARCHY_NUM] = {
435 			{70705899, 70705899, 70705899, 70705899},
436 			{82433173, 82433173, 87483115, 94445660},
437 			{92888734, 92888734, 95487525, 99770748},
438 		};
439 
440 		ret = rtl2830_bulk_read(client, 0x33c, &u8tmp, 1);
441 		if (ret)
442 			goto err;
443 
444 		constellation = (u8tmp >> 2) & 0x03; /* [3:2] */
445 		if (constellation > CONSTELLATION_NUM - 1)
446 			goto err;
447 
448 		hierarchy = (u8tmp >> 4) & 0x07; /* [6:4] */
449 		if (hierarchy > HIERARCHY_NUM - 1)
450 			goto err;
451 
452 		ret = rtl2830_bulk_read(client, 0x40c, buf, 2);
453 		if (ret)
454 			goto err;
455 
456 		utmp = buf[0] << 8 | buf[1] << 0;
457 		if (utmp)
458 			stmp = (constant[constellation][hierarchy] -
459 			       intlog10(utmp)) / ((1 << 24) / 10000);
460 		else
461 			stmp = 0;
462 
463 		dev_dbg(&client->dev, "CNR raw=%u\n", utmp);
464 
465 		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
466 		c->cnr.stat[0].svalue = stmp;
467 	} else {
468 		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
469 	}
470 
471 	/* BER */
472 	if (dev->fe_status & FE_HAS_LOCK) {
473 		ret = rtl2830_bulk_read(client, 0x34e, buf, 2);
474 		if (ret)
475 			goto err;
476 
477 		utmp = buf[0] << 8 | buf[1] << 0;
478 		dev->post_bit_error += utmp;
479 		dev->post_bit_count += 1000000;
480 
481 		dev_dbg(&client->dev, "BER errors=%u total=1000000\n", utmp);
482 
483 		c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
484 		c->post_bit_error.stat[0].uvalue = dev->post_bit_error;
485 		c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
486 		c->post_bit_count.stat[0].uvalue = dev->post_bit_count;
487 	} else {
488 		c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
489 		c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
490 	}
491 
492 
493 	return ret;
494 err:
495 	dev_dbg(&client->dev, "failed=%d\n", ret);
496 	return ret;
497 }
498 
499 static int rtl2830_read_snr(struct dvb_frontend *fe, u16 *snr)
500 {
501 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
502 
503 	if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL)
504 		*snr = div_s64(c->cnr.stat[0].svalue, 100);
505 	else
506 		*snr = 0;
507 
508 	return 0;
509 }
510 
511 static int rtl2830_read_ber(struct dvb_frontend *fe, u32 *ber)
512 {
513 	struct i2c_client *client = fe->demodulator_priv;
514 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
515 
516 	*ber = (dev->post_bit_error - dev->post_bit_error_prev);
517 	dev->post_bit_error_prev = dev->post_bit_error;
518 
519 	return 0;
520 }
521 
522 static int rtl2830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
523 {
524 	*ucblocks = 0;
525 
526 	return 0;
527 }
528 
529 static int rtl2830_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
530 {
531 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
532 
533 	if (c->strength.stat[0].scale == FE_SCALE_RELATIVE)
534 		*strength = c->strength.stat[0].uvalue;
535 	else
536 		*strength = 0;
537 
538 	return 0;
539 }
540 
541 static const struct dvb_frontend_ops rtl2830_ops = {
542 	.delsys = {SYS_DVBT},
543 	.info = {
544 		.name = "Realtek RTL2830 (DVB-T)",
545 		.caps = FE_CAN_FEC_1_2 |
546 			FE_CAN_FEC_2_3 |
547 			FE_CAN_FEC_3_4 |
548 			FE_CAN_FEC_5_6 |
549 			FE_CAN_FEC_7_8 |
550 			FE_CAN_FEC_AUTO |
551 			FE_CAN_QPSK |
552 			FE_CAN_QAM_16 |
553 			FE_CAN_QAM_64 |
554 			FE_CAN_QAM_AUTO |
555 			FE_CAN_TRANSMISSION_MODE_AUTO |
556 			FE_CAN_GUARD_INTERVAL_AUTO |
557 			FE_CAN_HIERARCHY_AUTO |
558 			FE_CAN_RECOVER |
559 			FE_CAN_MUTE_TS
560 	},
561 
562 	.init = rtl2830_init,
563 	.sleep = rtl2830_sleep,
564 
565 	.get_tune_settings = rtl2830_get_tune_settings,
566 
567 	.set_frontend = rtl2830_set_frontend,
568 	.get_frontend = rtl2830_get_frontend,
569 
570 	.read_status = rtl2830_read_status,
571 	.read_snr = rtl2830_read_snr,
572 	.read_ber = rtl2830_read_ber,
573 	.read_ucblocks = rtl2830_read_ucblocks,
574 	.read_signal_strength = rtl2830_read_signal_strength,
575 };
576 
577 static int rtl2830_pid_filter_ctrl(struct dvb_frontend *fe, int onoff)
578 {
579 	struct i2c_client *client = fe->demodulator_priv;
580 	int ret;
581 	u8 u8tmp;
582 
583 	dev_dbg(&client->dev, "onoff=%d\n", onoff);
584 
585 	/* enable / disable PID filter */
586 	if (onoff)
587 		u8tmp = 0x80;
588 	else
589 		u8tmp = 0x00;
590 
591 	ret = rtl2830_update_bits(client, 0x061, 0x80, u8tmp);
592 	if (ret)
593 		goto err;
594 
595 	return 0;
596 err:
597 	dev_dbg(&client->dev, "failed=%d\n", ret);
598 	return ret;
599 }
600 
601 static int rtl2830_pid_filter(struct dvb_frontend *fe, u8 index, u16 pid, int onoff)
602 {
603 	struct i2c_client *client = fe->demodulator_priv;
604 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
605 	int ret;
606 	u8 buf[4];
607 
608 	dev_dbg(&client->dev, "index=%d pid=%04x onoff=%d\n",
609 		index, pid, onoff);
610 
611 	/* skip invalid PIDs (0x2000) */
612 	if (pid > 0x1fff || index > 32)
613 		return 0;
614 
615 	if (onoff)
616 		set_bit(index, &dev->filters);
617 	else
618 		clear_bit(index, &dev->filters);
619 
620 	/* enable / disable PIDs */
621 	buf[0] = (dev->filters >>  0) & 0xff;
622 	buf[1] = (dev->filters >>  8) & 0xff;
623 	buf[2] = (dev->filters >> 16) & 0xff;
624 	buf[3] = (dev->filters >> 24) & 0xff;
625 	ret = rtl2830_bulk_write(client, 0x062, buf, 4);
626 	if (ret)
627 		goto err;
628 
629 	/* add PID */
630 	buf[0] = (pid >> 8) & 0xff;
631 	buf[1] = (pid >> 0) & 0xff;
632 	ret = rtl2830_bulk_write(client, 0x066 + 2 * index, buf, 2);
633 	if (ret)
634 		goto err;
635 
636 	return 0;
637 err:
638 	dev_dbg(&client->dev, "failed=%d\n", ret);
639 	return ret;
640 }
641 
642 /*
643  * I2C gate/mux/repeater logic
644  * We must use unlocked __i2c_transfer() here (through regmap) because of I2C
645  * adapter lock is already taken by tuner driver.
646  * Gate is closed automatically after single I2C transfer.
647  */
648 static int rtl2830_select(struct i2c_mux_core *muxc, u32 chan_id)
649 {
650 	struct i2c_client *client = i2c_mux_priv(muxc);
651 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
652 	int ret;
653 
654 	dev_dbg(&client->dev, "\n");
655 
656 	/* open I2C repeater for 1 transfer, closes automatically */
657 	/* XXX: regmap_update_bits() does not lock I2C adapter */
658 	ret = regmap_update_bits(dev->regmap, 0x101, 0x08, 0x08);
659 	if (ret)
660 		goto err;
661 
662 	return 0;
663 err:
664 	dev_dbg(&client->dev, "failed=%d\n", ret);
665 	return ret;
666 }
667 
668 static struct dvb_frontend *rtl2830_get_dvb_frontend(struct i2c_client *client)
669 {
670 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
671 
672 	dev_dbg(&client->dev, "\n");
673 
674 	return &dev->fe;
675 }
676 
677 static struct i2c_adapter *rtl2830_get_i2c_adapter(struct i2c_client *client)
678 {
679 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
680 
681 	dev_dbg(&client->dev, "\n");
682 
683 	return dev->muxc->adapter[0];
684 }
685 
686 /*
687  * We implement own I2C access routines for regmap in order to get manual access
688  * to I2C adapter lock, which is needed for I2C mux adapter.
689  */
690 static int rtl2830_regmap_read(void *context, const void *reg_buf,
691 			       size_t reg_size, void *val_buf, size_t val_size)
692 {
693 	struct i2c_client *client = context;
694 	int ret;
695 	struct i2c_msg msg[2] = {
696 		{
697 			.addr = client->addr,
698 			.flags = 0,
699 			.len = reg_size,
700 			.buf = (u8 *)reg_buf,
701 		}, {
702 			.addr = client->addr,
703 			.flags = I2C_M_RD,
704 			.len = val_size,
705 			.buf = val_buf,
706 		}
707 	};
708 
709 	ret = __i2c_transfer(client->adapter, msg, 2);
710 	if (ret != 2) {
711 		dev_warn(&client->dev, "i2c reg read failed %d\n", ret);
712 		if (ret >= 0)
713 			ret = -EREMOTEIO;
714 		return ret;
715 	}
716 	return 0;
717 }
718 
719 static int rtl2830_regmap_write(void *context, const void *data, size_t count)
720 {
721 	struct i2c_client *client = context;
722 	int ret;
723 	struct i2c_msg msg[1] = {
724 		{
725 			.addr = client->addr,
726 			.flags = 0,
727 			.len = count,
728 			.buf = (u8 *)data,
729 		}
730 	};
731 
732 	ret = __i2c_transfer(client->adapter, msg, 1);
733 	if (ret != 1) {
734 		dev_warn(&client->dev, "i2c reg write failed %d\n", ret);
735 		if (ret >= 0)
736 			ret = -EREMOTEIO;
737 		return ret;
738 	}
739 	return 0;
740 }
741 
742 static int rtl2830_regmap_gather_write(void *context, const void *reg,
743 				       size_t reg_len, const void *val,
744 				       size_t val_len)
745 {
746 	struct i2c_client *client = context;
747 	int ret;
748 	u8 buf[256];
749 	struct i2c_msg msg[1] = {
750 		{
751 			.addr = client->addr,
752 			.flags = 0,
753 			.len = 1 + val_len,
754 			.buf = buf,
755 		}
756 	};
757 
758 	buf[0] = *(u8 const *)reg;
759 	memcpy(&buf[1], val, val_len);
760 
761 	ret = __i2c_transfer(client->adapter, msg, 1);
762 	if (ret != 1) {
763 		dev_warn(&client->dev, "i2c reg write failed %d\n", ret);
764 		if (ret >= 0)
765 			ret = -EREMOTEIO;
766 		return ret;
767 	}
768 	return 0;
769 }
770 
771 static int rtl2830_probe(struct i2c_client *client)
772 {
773 	struct rtl2830_platform_data *pdata = client->dev.platform_data;
774 	struct rtl2830_dev *dev;
775 	int ret;
776 	u8 u8tmp;
777 	static const struct regmap_bus regmap_bus = {
778 		.read = rtl2830_regmap_read,
779 		.write = rtl2830_regmap_write,
780 		.gather_write = rtl2830_regmap_gather_write,
781 		.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
782 	};
783 	static const struct regmap_range_cfg regmap_range_cfg[] = {
784 		{
785 			.selector_reg     = 0x00,
786 			.selector_mask    = 0xff,
787 			.selector_shift   = 0,
788 			.window_start     = 0,
789 			.window_len       = 0x100,
790 			.range_min        = 0 * 0x100,
791 			.range_max        = 5 * 0x100,
792 		},
793 	};
794 	static const struct regmap_config regmap_config = {
795 		.reg_bits    =  8,
796 		.val_bits    =  8,
797 		.max_register = 5 * 0x100,
798 		.ranges = regmap_range_cfg,
799 		.num_ranges = ARRAY_SIZE(regmap_range_cfg),
800 	};
801 
802 	dev_dbg(&client->dev, "\n");
803 
804 	if (pdata == NULL) {
805 		ret = -EINVAL;
806 		goto err;
807 	}
808 
809 	/* allocate memory for the internal state */
810 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
811 	if (dev == NULL) {
812 		ret = -ENOMEM;
813 		goto err;
814 	}
815 
816 	/* setup the state */
817 	i2c_set_clientdata(client, dev);
818 	dev->client = client;
819 	dev->pdata = client->dev.platform_data;
820 	dev->sleeping = true;
821 	dev->regmap = regmap_init(&client->dev, &regmap_bus, client,
822 				  &regmap_config);
823 	if (IS_ERR(dev->regmap)) {
824 		ret = PTR_ERR(dev->regmap);
825 		goto err_kfree;
826 	}
827 
828 	/* check if the demod is there */
829 	ret = rtl2830_bulk_read(client, 0x000, &u8tmp, 1);
830 	if (ret)
831 		goto err_regmap_exit;
832 
833 	/* create muxed i2c adapter for tuner */
834 	dev->muxc = i2c_mux_alloc(client->adapter, &client->dev, 1, 0, 0,
835 				  rtl2830_select, NULL);
836 	if (!dev->muxc) {
837 		ret = -ENOMEM;
838 		goto err_regmap_exit;
839 	}
840 	dev->muxc->priv = client;
841 	ret = i2c_mux_add_adapter(dev->muxc, 0, 0, 0);
842 	if (ret)
843 		goto err_regmap_exit;
844 
845 	/* create dvb frontend */
846 	memcpy(&dev->fe.ops, &rtl2830_ops, sizeof(dev->fe.ops));
847 	dev->fe.demodulator_priv = client;
848 
849 	/* setup callbacks */
850 	pdata->get_dvb_frontend = rtl2830_get_dvb_frontend;
851 	pdata->get_i2c_adapter = rtl2830_get_i2c_adapter;
852 	pdata->pid_filter = rtl2830_pid_filter;
853 	pdata->pid_filter_ctrl = rtl2830_pid_filter_ctrl;
854 
855 	dev_info(&client->dev, "Realtek RTL2830 successfully attached\n");
856 
857 	return 0;
858 err_regmap_exit:
859 	regmap_exit(dev->regmap);
860 err_kfree:
861 	kfree(dev);
862 err:
863 	dev_dbg(&client->dev, "failed=%d\n", ret);
864 	return ret;
865 }
866 
867 static void rtl2830_remove(struct i2c_client *client)
868 {
869 	struct rtl2830_dev *dev = i2c_get_clientdata(client);
870 
871 	dev_dbg(&client->dev, "\n");
872 
873 	i2c_mux_del_adapters(dev->muxc);
874 	regmap_exit(dev->regmap);
875 	kfree(dev);
876 }
877 
878 static const struct i2c_device_id rtl2830_id_table[] = {
879 	{"rtl2830", 0},
880 	{}
881 };
882 MODULE_DEVICE_TABLE(i2c, rtl2830_id_table);
883 
884 static struct i2c_driver rtl2830_driver = {
885 	.driver = {
886 		.name			= "rtl2830",
887 		.suppress_bind_attrs	= true,
888 	},
889 	.probe		= rtl2830_probe,
890 	.remove		= rtl2830_remove,
891 	.id_table	= rtl2830_id_table,
892 };
893 
894 module_i2c_driver(rtl2830_driver);
895 
896 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
897 MODULE_DESCRIPTION("Realtek RTL2830 DVB-T demodulator driver");
898 MODULE_LICENSE("GPL");
899