xref: /openbmc/linux/drivers/media/tuners/e4000.c (revision aaeb31c0)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Elonics E4000 silicon tuner driver
4  *
5  * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
6  */
7 
8 #include "e4000_priv.h"
9 
e4000_init(struct e4000_dev * dev)10 static int e4000_init(struct e4000_dev *dev)
11 {
12 	struct i2c_client *client = dev->client;
13 	int ret;
14 
15 	dev_dbg(&client->dev, "\n");
16 
17 	/* reset */
18 	ret = regmap_write(dev->regmap, 0x00, 0x01);
19 	if (ret)
20 		goto err;
21 
22 	/* disable output clock */
23 	ret = regmap_write(dev->regmap, 0x06, 0x00);
24 	if (ret)
25 		goto err;
26 
27 	ret = regmap_write(dev->regmap, 0x7a, 0x96);
28 	if (ret)
29 		goto err;
30 
31 	/* configure gains */
32 	ret = regmap_bulk_write(dev->regmap, 0x7e, "\x01\xfe", 2);
33 	if (ret)
34 		goto err;
35 
36 	ret = regmap_write(dev->regmap, 0x82, 0x00);
37 	if (ret)
38 		goto err;
39 
40 	ret = regmap_write(dev->regmap, 0x24, 0x05);
41 	if (ret)
42 		goto err;
43 
44 	ret = regmap_bulk_write(dev->regmap, 0x87, "\x20\x01", 2);
45 	if (ret)
46 		goto err;
47 
48 	ret = regmap_bulk_write(dev->regmap, 0x9f, "\x7f\x07", 2);
49 	if (ret)
50 		goto err;
51 
52 	/* DC offset control */
53 	ret = regmap_write(dev->regmap, 0x2d, 0x1f);
54 	if (ret)
55 		goto err;
56 
57 	ret = regmap_bulk_write(dev->regmap, 0x70, "\x01\x01", 2);
58 	if (ret)
59 		goto err;
60 
61 	/* gain control */
62 	ret = regmap_write(dev->regmap, 0x1a, 0x17);
63 	if (ret)
64 		goto err;
65 
66 	ret = regmap_write(dev->regmap, 0x1f, 0x1a);
67 	if (ret)
68 		goto err;
69 
70 	dev->active = true;
71 
72 	return 0;
73 err:
74 	dev_dbg(&client->dev, "failed=%d\n", ret);
75 	return ret;
76 }
77 
e4000_sleep(struct e4000_dev * dev)78 static int e4000_sleep(struct e4000_dev *dev)
79 {
80 	struct i2c_client *client = dev->client;
81 	int ret;
82 
83 	dev_dbg(&client->dev, "\n");
84 
85 	dev->active = false;
86 
87 	ret = regmap_write(dev->regmap, 0x00, 0x00);
88 	if (ret)
89 		goto err;
90 
91 	return 0;
92 err:
93 	dev_dbg(&client->dev, "failed=%d\n", ret);
94 	return ret;
95 }
96 
e4000_set_params(struct e4000_dev * dev)97 static int e4000_set_params(struct e4000_dev *dev)
98 {
99 	struct i2c_client *client = dev->client;
100 	int ret, i;
101 	unsigned int div_n, k, k_cw, div_out;
102 	u64 f_vco;
103 	u8 buf[5], i_data[4], q_data[4];
104 
105 	if (!dev->active) {
106 		dev_dbg(&client->dev, "tuner is sleeping\n");
107 		return 0;
108 	}
109 
110 	/* gain control manual */
111 	ret = regmap_write(dev->regmap, 0x1a, 0x00);
112 	if (ret)
113 		goto err;
114 
115 	/*
116 	 * Fractional-N synthesizer
117 	 *
118 	 *           +----------------------------+
119 	 *           v                            |
120 	 *  Fref   +----+     +-------+         +------+     +---+
121 	 * ------> | PD | --> |  VCO  | ------> | /N.F | <-- | K |
122 	 *         +----+     +-------+         +------+     +---+
123 	 *                      |
124 	 *                      |
125 	 *                      v
126 	 *                    +-------+  Fout
127 	 *                    | /Rout | ------>
128 	 *                    +-------+
129 	 */
130 	for (i = 0; i < ARRAY_SIZE(e4000_pll_lut); i++) {
131 		if (dev->f_frequency <= e4000_pll_lut[i].freq)
132 			break;
133 	}
134 	if (i == ARRAY_SIZE(e4000_pll_lut)) {
135 		ret = -EINVAL;
136 		goto err;
137 	}
138 
139 	#define F_REF dev->clk
140 	div_out = e4000_pll_lut[i].div_out;
141 	f_vco = (u64) dev->f_frequency * div_out;
142 	/* calculate PLL integer and fractional control word */
143 	div_n = div_u64_rem(f_vco, F_REF, &k);
144 	k_cw = div_u64((u64) k * 0x10000, F_REF);
145 
146 	dev_dbg(&client->dev,
147 		"frequency=%u bandwidth=%u f_vco=%llu F_REF=%u div_n=%u k=%u k_cw=%04x div_out=%u\n",
148 		dev->f_frequency, dev->f_bandwidth, f_vco, F_REF, div_n, k,
149 		k_cw, div_out);
150 
151 	buf[0] = div_n;
152 	buf[1] = (k_cw >> 0) & 0xff;
153 	buf[2] = (k_cw >> 8) & 0xff;
154 	buf[3] = 0x00;
155 	buf[4] = e4000_pll_lut[i].div_out_reg;
156 	ret = regmap_bulk_write(dev->regmap, 0x09, buf, 5);
157 	if (ret)
158 		goto err;
159 
160 	/* LNA filter (RF filter) */
161 	for (i = 0; i < ARRAY_SIZE(e400_lna_filter_lut); i++) {
162 		if (dev->f_frequency <= e400_lna_filter_lut[i].freq)
163 			break;
164 	}
165 	if (i == ARRAY_SIZE(e400_lna_filter_lut)) {
166 		ret = -EINVAL;
167 		goto err;
168 	}
169 
170 	ret = regmap_write(dev->regmap, 0x10, e400_lna_filter_lut[i].val);
171 	if (ret)
172 		goto err;
173 
174 	/* IF filters */
175 	for (i = 0; i < ARRAY_SIZE(e4000_if_filter_lut); i++) {
176 		if (dev->f_bandwidth <= e4000_if_filter_lut[i].freq)
177 			break;
178 	}
179 	if (i == ARRAY_SIZE(e4000_if_filter_lut)) {
180 		ret = -EINVAL;
181 		goto err;
182 	}
183 
184 	buf[0] = e4000_if_filter_lut[i].reg11_val;
185 	buf[1] = e4000_if_filter_lut[i].reg12_val;
186 
187 	ret = regmap_bulk_write(dev->regmap, 0x11, buf, 2);
188 	if (ret)
189 		goto err;
190 
191 	/* frequency band */
192 	for (i = 0; i < ARRAY_SIZE(e4000_band_lut); i++) {
193 		if (dev->f_frequency <= e4000_band_lut[i].freq)
194 			break;
195 	}
196 	if (i == ARRAY_SIZE(e4000_band_lut)) {
197 		ret = -EINVAL;
198 		goto err;
199 	}
200 
201 	ret = regmap_write(dev->regmap, 0x07, e4000_band_lut[i].reg07_val);
202 	if (ret)
203 		goto err;
204 
205 	ret = regmap_write(dev->regmap, 0x78, e4000_band_lut[i].reg78_val);
206 	if (ret)
207 		goto err;
208 
209 	/* DC offset */
210 	for (i = 0; i < 4; i++) {
211 		if (i == 0)
212 			ret = regmap_bulk_write(dev->regmap, 0x15, "\x00\x7e\x24", 3);
213 		else if (i == 1)
214 			ret = regmap_bulk_write(dev->regmap, 0x15, "\x00\x7f", 2);
215 		else if (i == 2)
216 			ret = regmap_bulk_write(dev->regmap, 0x15, "\x01", 1);
217 		else
218 			ret = regmap_bulk_write(dev->regmap, 0x16, "\x7e", 1);
219 
220 		if (ret)
221 			goto err;
222 
223 		ret = regmap_write(dev->regmap, 0x29, 0x01);
224 		if (ret)
225 			goto err;
226 
227 		ret = regmap_bulk_read(dev->regmap, 0x2a, buf, 3);
228 		if (ret)
229 			goto err;
230 
231 		i_data[i] = (((buf[2] >> 0) & 0x3) << 6) | (buf[0] & 0x3f);
232 		q_data[i] = (((buf[2] >> 4) & 0x3) << 6) | (buf[1] & 0x3f);
233 	}
234 
235 	swap(q_data[2], q_data[3]);
236 	swap(i_data[2], i_data[3]);
237 
238 	ret = regmap_bulk_write(dev->regmap, 0x50, q_data, 4);
239 	if (ret)
240 		goto err;
241 
242 	ret = regmap_bulk_write(dev->regmap, 0x60, i_data, 4);
243 	if (ret)
244 		goto err;
245 
246 	/* gain control auto */
247 	ret = regmap_write(dev->regmap, 0x1a, 0x17);
248 	if (ret)
249 		goto err;
250 
251 	return 0;
252 err:
253 	dev_dbg(&client->dev, "failed=%d\n", ret);
254 	return ret;
255 }
256 
257 /*
258  * V4L2 API
259  */
260 #if IS_ENABLED(CONFIG_VIDEO_DEV)
261 static const struct v4l2_frequency_band bands[] = {
262 	{
263 		.type = V4L2_TUNER_RF,
264 		.index = 0,
265 		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
266 		.rangelow   =    59000000,
267 		.rangehigh  =  1105000000,
268 	},
269 	{
270 		.type = V4L2_TUNER_RF,
271 		.index = 1,
272 		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
273 		.rangelow   =  1249000000,
274 		.rangehigh  =  2208000000UL,
275 	},
276 };
277 
e4000_subdev_to_dev(struct v4l2_subdev * sd)278 static inline struct e4000_dev *e4000_subdev_to_dev(struct v4l2_subdev *sd)
279 {
280 	return container_of(sd, struct e4000_dev, sd);
281 }
282 
e4000_standby(struct v4l2_subdev * sd)283 static int e4000_standby(struct v4l2_subdev *sd)
284 {
285 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
286 	int ret;
287 
288 	ret = e4000_sleep(dev);
289 	if (ret)
290 		return ret;
291 
292 	return e4000_set_params(dev);
293 }
294 
e4000_g_tuner(struct v4l2_subdev * sd,struct v4l2_tuner * v)295 static int e4000_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
296 {
297 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
298 	struct i2c_client *client = dev->client;
299 
300 	dev_dbg(&client->dev, "index=%d\n", v->index);
301 
302 	strscpy(v->name, "Elonics E4000", sizeof(v->name));
303 	v->type = V4L2_TUNER_RF;
304 	v->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
305 	v->rangelow  = bands[0].rangelow;
306 	v->rangehigh = bands[1].rangehigh;
307 	return 0;
308 }
309 
e4000_s_tuner(struct v4l2_subdev * sd,const struct v4l2_tuner * v)310 static int e4000_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
311 {
312 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
313 	struct i2c_client *client = dev->client;
314 
315 	dev_dbg(&client->dev, "index=%d\n", v->index);
316 	return 0;
317 }
318 
e4000_g_frequency(struct v4l2_subdev * sd,struct v4l2_frequency * f)319 static int e4000_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
320 {
321 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
322 	struct i2c_client *client = dev->client;
323 
324 	dev_dbg(&client->dev, "tuner=%d\n", f->tuner);
325 	f->frequency = dev->f_frequency;
326 	return 0;
327 }
328 
e4000_s_frequency(struct v4l2_subdev * sd,const struct v4l2_frequency * f)329 static int e4000_s_frequency(struct v4l2_subdev *sd,
330 			      const struct v4l2_frequency *f)
331 {
332 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
333 	struct i2c_client *client = dev->client;
334 
335 	dev_dbg(&client->dev, "tuner=%d type=%d frequency=%u\n",
336 		f->tuner, f->type, f->frequency);
337 
338 	dev->f_frequency = clamp_t(unsigned int, f->frequency,
339 				   bands[0].rangelow, bands[1].rangehigh);
340 	return e4000_set_params(dev);
341 }
342 
e4000_enum_freq_bands(struct v4l2_subdev * sd,struct v4l2_frequency_band * band)343 static int e4000_enum_freq_bands(struct v4l2_subdev *sd,
344 				  struct v4l2_frequency_band *band)
345 {
346 	struct e4000_dev *dev = e4000_subdev_to_dev(sd);
347 	struct i2c_client *client = dev->client;
348 
349 	dev_dbg(&client->dev, "tuner=%d type=%d index=%d\n",
350 		band->tuner, band->type, band->index);
351 
352 	if (band->index >= ARRAY_SIZE(bands))
353 		return -EINVAL;
354 
355 	band->capability = bands[band->index].capability;
356 	band->rangelow = bands[band->index].rangelow;
357 	band->rangehigh = bands[band->index].rangehigh;
358 	return 0;
359 }
360 
361 static const struct v4l2_subdev_tuner_ops e4000_subdev_tuner_ops = {
362 	.standby                  = e4000_standby,
363 	.g_tuner                  = e4000_g_tuner,
364 	.s_tuner                  = e4000_s_tuner,
365 	.g_frequency              = e4000_g_frequency,
366 	.s_frequency              = e4000_s_frequency,
367 	.enum_freq_bands          = e4000_enum_freq_bands,
368 };
369 
370 static const struct v4l2_subdev_ops e4000_subdev_ops = {
371 	.tuner                    = &e4000_subdev_tuner_ops,
372 };
373 
e4000_set_lna_gain(struct dvb_frontend * fe)374 static int e4000_set_lna_gain(struct dvb_frontend *fe)
375 {
376 	struct e4000_dev *dev = fe->tuner_priv;
377 	struct i2c_client *client = dev->client;
378 	int ret;
379 	u8 u8tmp;
380 
381 	dev_dbg(&client->dev, "lna auto=%d->%d val=%d->%d\n",
382 		dev->lna_gain_auto->cur.val, dev->lna_gain_auto->val,
383 		dev->lna_gain->cur.val, dev->lna_gain->val);
384 
385 	if (dev->lna_gain_auto->val && dev->if_gain_auto->cur.val)
386 		u8tmp = 0x17;
387 	else if (dev->lna_gain_auto->val)
388 		u8tmp = 0x19;
389 	else if (dev->if_gain_auto->cur.val)
390 		u8tmp = 0x16;
391 	else
392 		u8tmp = 0x10;
393 
394 	ret = regmap_write(dev->regmap, 0x1a, u8tmp);
395 	if (ret)
396 		goto err;
397 
398 	if (dev->lna_gain_auto->val == false) {
399 		ret = regmap_write(dev->regmap, 0x14, dev->lna_gain->val);
400 		if (ret)
401 			goto err;
402 	}
403 
404 	return 0;
405 err:
406 	dev_dbg(&client->dev, "failed=%d\n", ret);
407 	return ret;
408 }
409 
e4000_set_mixer_gain(struct dvb_frontend * fe)410 static int e4000_set_mixer_gain(struct dvb_frontend *fe)
411 {
412 	struct e4000_dev *dev = fe->tuner_priv;
413 	struct i2c_client *client = dev->client;
414 	int ret;
415 	u8 u8tmp;
416 
417 	dev_dbg(&client->dev, "mixer auto=%d->%d val=%d->%d\n",
418 		dev->mixer_gain_auto->cur.val, dev->mixer_gain_auto->val,
419 		dev->mixer_gain->cur.val, dev->mixer_gain->val);
420 
421 	if (dev->mixer_gain_auto->val)
422 		u8tmp = 0x15;
423 	else
424 		u8tmp = 0x14;
425 
426 	ret = regmap_write(dev->regmap, 0x20, u8tmp);
427 	if (ret)
428 		goto err;
429 
430 	if (dev->mixer_gain_auto->val == false) {
431 		ret = regmap_write(dev->regmap, 0x15, dev->mixer_gain->val);
432 		if (ret)
433 			goto err;
434 	}
435 
436 	return 0;
437 err:
438 	dev_dbg(&client->dev, "failed=%d\n", ret);
439 	return ret;
440 }
441 
e4000_set_if_gain(struct dvb_frontend * fe)442 static int e4000_set_if_gain(struct dvb_frontend *fe)
443 {
444 	struct e4000_dev *dev = fe->tuner_priv;
445 	struct i2c_client *client = dev->client;
446 	int ret;
447 	u8 buf[2];
448 	u8 u8tmp;
449 
450 	dev_dbg(&client->dev, "if auto=%d->%d val=%d->%d\n",
451 		dev->if_gain_auto->cur.val, dev->if_gain_auto->val,
452 		dev->if_gain->cur.val, dev->if_gain->val);
453 
454 	if (dev->if_gain_auto->val && dev->lna_gain_auto->cur.val)
455 		u8tmp = 0x17;
456 	else if (dev->lna_gain_auto->cur.val)
457 		u8tmp = 0x19;
458 	else if (dev->if_gain_auto->val)
459 		u8tmp = 0x16;
460 	else
461 		u8tmp = 0x10;
462 
463 	ret = regmap_write(dev->regmap, 0x1a, u8tmp);
464 	if (ret)
465 		goto err;
466 
467 	if (dev->if_gain_auto->val == false) {
468 		buf[0] = e4000_if_gain_lut[dev->if_gain->val].reg16_val;
469 		buf[1] = e4000_if_gain_lut[dev->if_gain->val].reg17_val;
470 		ret = regmap_bulk_write(dev->regmap, 0x16, buf, 2);
471 		if (ret)
472 			goto err;
473 	}
474 
475 	return 0;
476 err:
477 	dev_dbg(&client->dev, "failed=%d\n", ret);
478 	return ret;
479 }
480 
e4000_pll_lock(struct dvb_frontend * fe)481 static int e4000_pll_lock(struct dvb_frontend *fe)
482 {
483 	struct e4000_dev *dev = fe->tuner_priv;
484 	struct i2c_client *client = dev->client;
485 	int ret;
486 	unsigned int uitmp;
487 
488 	ret = regmap_read(dev->regmap, 0x07, &uitmp);
489 	if (ret)
490 		goto err;
491 
492 	dev->pll_lock->val = (uitmp & 0x01);
493 
494 	return 0;
495 err:
496 	dev_dbg(&client->dev, "failed=%d\n", ret);
497 	return ret;
498 }
499 
e4000_g_volatile_ctrl(struct v4l2_ctrl * ctrl)500 static int e4000_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
501 {
502 	struct e4000_dev *dev = container_of(ctrl->handler, struct e4000_dev, hdl);
503 	struct i2c_client *client = dev->client;
504 	int ret;
505 
506 	if (!dev->active)
507 		return 0;
508 
509 	switch (ctrl->id) {
510 	case  V4L2_CID_RF_TUNER_PLL_LOCK:
511 		ret = e4000_pll_lock(dev->fe);
512 		break;
513 	default:
514 		dev_dbg(&client->dev, "unknown ctrl: id=%d name=%s\n",
515 			ctrl->id, ctrl->name);
516 		ret = -EINVAL;
517 	}
518 
519 	return ret;
520 }
521 
e4000_s_ctrl(struct v4l2_ctrl * ctrl)522 static int e4000_s_ctrl(struct v4l2_ctrl *ctrl)
523 {
524 	struct e4000_dev *dev = container_of(ctrl->handler, struct e4000_dev, hdl);
525 	struct i2c_client *client = dev->client;
526 	int ret;
527 
528 	if (!dev->active)
529 		return 0;
530 
531 	switch (ctrl->id) {
532 	case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
533 	case V4L2_CID_RF_TUNER_BANDWIDTH:
534 		/*
535 		 * TODO: Auto logic does not work 100% correctly as tuner driver
536 		 * do not have information to calculate maximum suitable
537 		 * bandwidth. Calculating it is responsible of master driver.
538 		 */
539 		dev->f_bandwidth = dev->bandwidth->val;
540 		ret = e4000_set_params(dev);
541 		break;
542 	case  V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
543 	case  V4L2_CID_RF_TUNER_LNA_GAIN:
544 		ret = e4000_set_lna_gain(dev->fe);
545 		break;
546 	case  V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
547 	case  V4L2_CID_RF_TUNER_MIXER_GAIN:
548 		ret = e4000_set_mixer_gain(dev->fe);
549 		break;
550 	case  V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
551 	case  V4L2_CID_RF_TUNER_IF_GAIN:
552 		ret = e4000_set_if_gain(dev->fe);
553 		break;
554 	default:
555 		dev_dbg(&client->dev, "unknown ctrl: id=%d name=%s\n",
556 			ctrl->id, ctrl->name);
557 		ret = -EINVAL;
558 	}
559 
560 	return ret;
561 }
562 
563 static const struct v4l2_ctrl_ops e4000_ctrl_ops = {
564 	.g_volatile_ctrl = e4000_g_volatile_ctrl,
565 	.s_ctrl = e4000_s_ctrl,
566 };
567 #endif
568 
569 /*
570  * DVB API
571  */
e4000_dvb_set_params(struct dvb_frontend * fe)572 static int e4000_dvb_set_params(struct dvb_frontend *fe)
573 {
574 	struct e4000_dev *dev = fe->tuner_priv;
575 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
576 
577 	dev->f_frequency = c->frequency;
578 	dev->f_bandwidth = c->bandwidth_hz;
579 	return e4000_set_params(dev);
580 }
581 
e4000_dvb_init(struct dvb_frontend * fe)582 static int e4000_dvb_init(struct dvb_frontend *fe)
583 {
584 	return e4000_init(fe->tuner_priv);
585 }
586 
e4000_dvb_sleep(struct dvb_frontend * fe)587 static int e4000_dvb_sleep(struct dvb_frontend *fe)
588 {
589 	return e4000_sleep(fe->tuner_priv);
590 }
591 
e4000_dvb_get_if_frequency(struct dvb_frontend * fe,u32 * frequency)592 static int e4000_dvb_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
593 {
594 	*frequency = 0; /* Zero-IF */
595 	return 0;
596 }
597 
598 static const struct dvb_tuner_ops e4000_dvb_tuner_ops = {
599 	.info = {
600 		.name              = "Elonics E4000",
601 		.frequency_min_hz  = 174 * MHz,
602 		.frequency_max_hz  = 862 * MHz,
603 	},
604 
605 	.init = e4000_dvb_init,
606 	.sleep = e4000_dvb_sleep,
607 	.set_params = e4000_dvb_set_params,
608 
609 	.get_if_frequency = e4000_dvb_get_if_frequency,
610 };
611 
e4000_probe(struct i2c_client * client)612 static int e4000_probe(struct i2c_client *client)
613 {
614 	struct e4000_dev *dev;
615 	struct e4000_config *cfg = client->dev.platform_data;
616 	struct dvb_frontend *fe = cfg->fe;
617 	int ret;
618 	unsigned int uitmp;
619 	static const struct regmap_config regmap_config = {
620 		.reg_bits = 8,
621 		.val_bits = 8,
622 	};
623 
624 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
625 	if (!dev) {
626 		ret = -ENOMEM;
627 		goto err;
628 	}
629 
630 	dev->clk = cfg->clock;
631 	dev->client = client;
632 	dev->fe = cfg->fe;
633 	dev->regmap = devm_regmap_init_i2c(client, &regmap_config);
634 	if (IS_ERR(dev->regmap)) {
635 		ret = PTR_ERR(dev->regmap);
636 		goto err_kfree;
637 	}
638 
639 	/* check if the tuner is there */
640 	ret = regmap_read(dev->regmap, 0x02, &uitmp);
641 	if (ret)
642 		goto err_kfree;
643 
644 	dev_dbg(&client->dev, "chip id=%02x\n", uitmp);
645 
646 	if (uitmp != 0x40) {
647 		ret = -ENODEV;
648 		goto err_kfree;
649 	}
650 
651 	/* put sleep as chip seems to be in normal mode by default */
652 	ret = regmap_write(dev->regmap, 0x00, 0x00);
653 	if (ret)
654 		goto err_kfree;
655 
656 #if IS_ENABLED(CONFIG_VIDEO_DEV)
657 	/* Register controls */
658 	v4l2_ctrl_handler_init(&dev->hdl, 9);
659 	dev->bandwidth_auto = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
660 			V4L2_CID_RF_TUNER_BANDWIDTH_AUTO, 0, 1, 1, 1);
661 	dev->bandwidth = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
662 			V4L2_CID_RF_TUNER_BANDWIDTH, 4300000, 11000000, 100000, 4300000);
663 	v4l2_ctrl_auto_cluster(2, &dev->bandwidth_auto, 0, false);
664 	dev->lna_gain_auto = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
665 			V4L2_CID_RF_TUNER_LNA_GAIN_AUTO, 0, 1, 1, 1);
666 	dev->lna_gain = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
667 			V4L2_CID_RF_TUNER_LNA_GAIN, 0, 15, 1, 10);
668 	v4l2_ctrl_auto_cluster(2, &dev->lna_gain_auto, 0, false);
669 	dev->mixer_gain_auto = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
670 			V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO, 0, 1, 1, 1);
671 	dev->mixer_gain = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
672 			V4L2_CID_RF_TUNER_MIXER_GAIN, 0, 1, 1, 1);
673 	v4l2_ctrl_auto_cluster(2, &dev->mixer_gain_auto, 0, false);
674 	dev->if_gain_auto = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
675 			V4L2_CID_RF_TUNER_IF_GAIN_AUTO, 0, 1, 1, 1);
676 	dev->if_gain = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
677 			V4L2_CID_RF_TUNER_IF_GAIN, 0, 54, 1, 0);
678 	v4l2_ctrl_auto_cluster(2, &dev->if_gain_auto, 0, false);
679 	dev->pll_lock = v4l2_ctrl_new_std(&dev->hdl, &e4000_ctrl_ops,
680 			V4L2_CID_RF_TUNER_PLL_LOCK,  0, 1, 1, 0);
681 	if (dev->hdl.error) {
682 		ret = dev->hdl.error;
683 		dev_err(&client->dev, "Could not initialize controls\n");
684 		v4l2_ctrl_handler_free(&dev->hdl);
685 		goto err_kfree;
686 	}
687 
688 	dev->sd.ctrl_handler = &dev->hdl;
689 	dev->f_frequency = bands[0].rangelow;
690 	dev->f_bandwidth = dev->bandwidth->val;
691 	v4l2_i2c_subdev_init(&dev->sd, client, &e4000_subdev_ops);
692 #endif
693 	fe->tuner_priv = dev;
694 	memcpy(&fe->ops.tuner_ops, &e4000_dvb_tuner_ops,
695 	       sizeof(fe->ops.tuner_ops));
696 	v4l2_set_subdevdata(&dev->sd, client);
697 	i2c_set_clientdata(client, &dev->sd);
698 
699 	dev_info(&client->dev, "Elonics E4000 successfully identified\n");
700 	return 0;
701 err_kfree:
702 	kfree(dev);
703 err:
704 	dev_dbg(&client->dev, "failed=%d\n", ret);
705 	return ret;
706 }
707 
e4000_remove(struct i2c_client * client)708 static void e4000_remove(struct i2c_client *client)
709 {
710 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
711 	struct e4000_dev *dev = container_of(sd, struct e4000_dev, sd);
712 
713 	dev_dbg(&client->dev, "\n");
714 
715 #if IS_ENABLED(CONFIG_VIDEO_DEV)
716 	v4l2_ctrl_handler_free(&dev->hdl);
717 #endif
718 	kfree(dev);
719 }
720 
721 static const struct i2c_device_id e4000_id_table[] = {
722 	{"e4000", 0},
723 	{}
724 };
725 MODULE_DEVICE_TABLE(i2c, e4000_id_table);
726 
727 static struct i2c_driver e4000_driver = {
728 	.driver = {
729 		.name	= "e4000",
730 		.suppress_bind_attrs = true,
731 	},
732 	.probe		= e4000_probe,
733 	.remove		= e4000_remove,
734 	.id_table	= e4000_id_table,
735 };
736 
737 module_i2c_driver(e4000_driver);
738 
739 MODULE_DESCRIPTION("Elonics E4000 silicon tuner driver");
740 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
741 MODULE_LICENSE("GPL");
742