1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * i2c tv tuner chip device driver
4  * controls microtune tuners, mt2032 + mt2050 at the moment.
5  *
6  * This "mt20xx" module was split apart from the original "tuner" module.
7  */
8 #include <linux/delay.h>
9 #include <linux/i2c.h>
10 #include <linux/slab.h>
11 #include <linux/videodev2.h>
12 #include "tuner-i2c.h"
13 #include "mt20xx.h"
14 
15 static int debug;
16 module_param(debug, int, 0644);
17 MODULE_PARM_DESC(debug, "enable verbose debug messages");
18 
19 /* ---------------------------------------------------------------------- */
20 
21 static unsigned int optimize_vco  = 1;
22 module_param(optimize_vco,      int, 0644);
23 
24 static unsigned int tv_antenna    = 1;
25 module_param(tv_antenna,        int, 0644);
26 
27 static unsigned int radio_antenna;
28 module_param(radio_antenna,     int, 0644);
29 
30 /* ---------------------------------------------------------------------- */
31 
32 #define MT2032 0x04
33 #define MT2030 0x06
34 #define MT2040 0x07
35 #define MT2050 0x42
36 
37 static char *microtune_part[] = {
38 	[ MT2030 ] = "MT2030",
39 	[ MT2032 ] = "MT2032",
40 	[ MT2040 ] = "MT2040",
41 	[ MT2050 ] = "MT2050",
42 };
43 
44 struct microtune_priv {
45 	struct tuner_i2c_props i2c_props;
46 
47 	unsigned int xogc;
48 	//unsigned int radio_if2;
49 
50 	u32 frequency;
51 };
52 
microtune_release(struct dvb_frontend * fe)53 static void microtune_release(struct dvb_frontend *fe)
54 {
55 	kfree(fe->tuner_priv);
56 	fe->tuner_priv = NULL;
57 }
58 
microtune_get_frequency(struct dvb_frontend * fe,u32 * frequency)59 static int microtune_get_frequency(struct dvb_frontend *fe, u32 *frequency)
60 {
61 	struct microtune_priv *priv = fe->tuner_priv;
62 	*frequency = priv->frequency;
63 	return 0;
64 }
65 
66 // IsSpurInBand()?
mt2032_spurcheck(struct dvb_frontend * fe,int f1,int f2,int spectrum_from,int spectrum_to)67 static int mt2032_spurcheck(struct dvb_frontend *fe,
68 			    int f1, int f2, int spectrum_from,int spectrum_to)
69 {
70 	struct microtune_priv *priv = fe->tuner_priv;
71 	int n1=1,n2,f;
72 
73 	f1=f1/1000; //scale to kHz to avoid 32bit overflows
74 	f2=f2/1000;
75 	spectrum_from/=1000;
76 	spectrum_to/=1000;
77 
78 	tuner_dbg("spurcheck f1=%d f2=%d  from=%d to=%d\n",
79 		  f1,f2,spectrum_from,spectrum_to);
80 
81 	do {
82 	    n2=-n1;
83 	    f=n1*(f1-f2);
84 	    do {
85 		n2--;
86 		f=f-f2;
87 		tuner_dbg("spurtest n1=%d n2=%d ftest=%d\n",n1,n2,f);
88 
89 		if( (f>spectrum_from) && (f<spectrum_to))
90 			tuner_dbg("mt2032 spurcheck triggered: %d\n",n1);
91 	    } while ( (f>(f2-spectrum_to)) || (n2>-5));
92 	    n1++;
93 	} while (n1<5);
94 
95 	return 1;
96 }
97 
mt2032_compute_freq(struct dvb_frontend * fe,unsigned int rfin,unsigned int if1,unsigned int if2,unsigned int spectrum_from,unsigned int spectrum_to,unsigned char * buf,int * ret_sel,unsigned int xogc)98 static int mt2032_compute_freq(struct dvb_frontend *fe,
99 			       unsigned int rfin,
100 			       unsigned int if1, unsigned int if2,
101 			       unsigned int spectrum_from,
102 			       unsigned int spectrum_to,
103 			       unsigned char *buf,
104 			       int *ret_sel,
105 			       unsigned int xogc) //all in Hz
106 {
107 	struct microtune_priv *priv = fe->tuner_priv;
108 	unsigned int fref,lo1,lo1n,lo1a,s,sel,lo1freq, desired_lo1,
109 		desired_lo2,lo2,lo2n,lo2a,lo2num,lo2freq;
110 
111 	fref= 5250 *1000; //5.25MHz
112 	desired_lo1=rfin+if1;
113 
114 	lo1=(2*(desired_lo1/1000)+(fref/1000)) / (2*fref/1000);
115 	lo1n=lo1/8;
116 	lo1a=lo1-(lo1n*8);
117 
118 	s=rfin/1000/1000+1090;
119 
120 	if(optimize_vco) {
121 		if(s>1890) sel=0;
122 		else if(s>1720) sel=1;
123 		else if(s>1530) sel=2;
124 		else if(s>1370) sel=3;
125 		else sel=4; // >1090
126 	}
127 	else {
128 		if(s>1790) sel=0; // <1958
129 		else if(s>1617) sel=1;
130 		else if(s>1449) sel=2;
131 		else if(s>1291) sel=3;
132 		else sel=4; // >1090
133 	}
134 	*ret_sel=sel;
135 
136 	lo1freq=(lo1a+8*lo1n)*fref;
137 
138 	tuner_dbg("mt2032: rfin=%d lo1=%d lo1n=%d lo1a=%d sel=%d, lo1freq=%d\n",
139 		  rfin,lo1,lo1n,lo1a,sel,lo1freq);
140 
141 	desired_lo2=lo1freq-rfin-if2;
142 	lo2=(desired_lo2)/fref;
143 	lo2n=lo2/8;
144 	lo2a=lo2-(lo2n*8);
145 	lo2num=((desired_lo2/1000)%(fref/1000))* 3780/(fref/1000); //scale to fit in 32bit arith
146 	lo2freq=(lo2a+8*lo2n)*fref + lo2num*(fref/1000)/3780*1000;
147 
148 	tuner_dbg("mt2032: rfin=%d lo2=%d lo2n=%d lo2a=%d num=%d lo2freq=%d\n",
149 		  rfin,lo2,lo2n,lo2a,lo2num,lo2freq);
150 
151 	if (lo1a > 7 || lo1n < 17 || lo1n > 48 || lo2a > 7 || lo2n < 17 ||
152 			lo2n > 30) {
153 		tuner_info("mt2032: frequency parameters out of range: %d %d %d %d\n",
154 			   lo1a, lo1n, lo2a,lo2n);
155 		return(-1);
156 	}
157 
158 	mt2032_spurcheck(fe, lo1freq, desired_lo2,  spectrum_from, spectrum_to);
159 	// should recalculate lo1 (one step up/down)
160 
161 	// set up MT2032 register map for transfer over i2c
162 	buf[0]=lo1n-1;
163 	buf[1]=lo1a | (sel<<4);
164 	buf[2]=0x86; // LOGC
165 	buf[3]=0x0f; //reserved
166 	buf[4]=0x1f;
167 	buf[5]=(lo2n-1) | (lo2a<<5);
168 	if(rfin >400*1000*1000)
169 		buf[6]=0xe4;
170 	else
171 		buf[6]=0xf4; // set PKEN per rev 1.2
172 	buf[7]=8+xogc;
173 	buf[8]=0xc3; //reserved
174 	buf[9]=0x4e; //reserved
175 	buf[10]=0xec; //reserved
176 	buf[11]=(lo2num&0xff);
177 	buf[12]=(lo2num>>8) |0x80; // Lo2RST
178 
179 	return 0;
180 }
181 
mt2032_check_lo_lock(struct dvb_frontend * fe)182 static int mt2032_check_lo_lock(struct dvb_frontend *fe)
183 {
184 	struct microtune_priv *priv = fe->tuner_priv;
185 	int try,lock=0;
186 	unsigned char buf[2];
187 
188 	for(try=0;try<10;try++) {
189 		buf[0]=0x0e;
190 		tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
191 		tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
192 		tuner_dbg("mt2032 Reg.E=0x%02x\n",buf[0]);
193 		lock=buf[0] &0x06;
194 
195 		if (lock==6)
196 			break;
197 
198 		tuner_dbg("mt2032: pll wait 1ms for lock (0x%2x)\n",buf[0]);
199 		udelay(1000);
200 	}
201 	return lock;
202 }
203 
mt2032_optimize_vco(struct dvb_frontend * fe,int sel,int lock)204 static int mt2032_optimize_vco(struct dvb_frontend *fe,int sel,int lock)
205 {
206 	struct microtune_priv *priv = fe->tuner_priv;
207 	unsigned char buf[2];
208 	int tad1;
209 
210 	buf[0]=0x0f;
211 	tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
212 	tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
213 	tuner_dbg("mt2032 Reg.F=0x%02x\n",buf[0]);
214 	tad1=buf[0]&0x07;
215 
216 	if(tad1 ==0) return lock;
217 	if(tad1 ==1) return lock;
218 
219 	if(tad1==2) {
220 		if(sel==0)
221 			return lock;
222 		else sel--;
223 	}
224 	else {
225 		if(sel<4)
226 			sel++;
227 		else
228 			return lock;
229 	}
230 
231 	tuner_dbg("mt2032 optimize_vco: sel=%d\n",sel);
232 
233 	buf[0]=0x0f;
234 	buf[1]=sel;
235 	tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
236 	lock=mt2032_check_lo_lock(fe);
237 	return lock;
238 }
239 
240 
mt2032_set_if_freq(struct dvb_frontend * fe,unsigned int rfin,unsigned int if1,unsigned int if2,unsigned int from,unsigned int to)241 static void mt2032_set_if_freq(struct dvb_frontend *fe, unsigned int rfin,
242 			       unsigned int if1, unsigned int if2,
243 			       unsigned int from, unsigned int to)
244 {
245 	unsigned char buf[21];
246 	int lint_try,ret,sel,lock=0;
247 	struct microtune_priv *priv = fe->tuner_priv;
248 
249 	tuner_dbg("mt2032_set_if_freq rfin=%d if1=%d if2=%d from=%d to=%d\n",
250 		  rfin,if1,if2,from,to);
251 
252 	buf[0]=0;
253 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
254 	tuner_i2c_xfer_recv(&priv->i2c_props,buf,21);
255 
256 	buf[0]=0;
257 	ret=mt2032_compute_freq(fe,rfin,if1,if2,from,to,&buf[1],&sel,priv->xogc);
258 	if (ret<0)
259 		return;
260 
261 	// send only the relevant registers per Rev. 1.2
262 	buf[0]=0;
263 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,4);
264 	buf[5]=5;
265 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+5,4);
266 	buf[11]=11;
267 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+11,3);
268 	if(ret!=3)
269 		tuner_warn("i2c i/o error: rc == %d (should be 3)\n",ret);
270 
271 	// wait for PLLs to lock (per manual), retry LINT if not.
272 	for(lint_try=0; lint_try<2; lint_try++) {
273 		lock=mt2032_check_lo_lock(fe);
274 
275 		if(optimize_vco)
276 			lock=mt2032_optimize_vco(fe,sel,lock);
277 		if(lock==6) break;
278 
279 		tuner_dbg("mt2032: re-init PLLs by LINT\n");
280 		buf[0]=7;
281 		buf[1]=0x80 +8+priv->xogc; // set LINT to re-init PLLs
282 		tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
283 		mdelay(10);
284 		buf[1]=8+priv->xogc;
285 		tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
286 	}
287 
288 	if (lock!=6)
289 		tuner_warn("MT2032 Fatal Error: PLLs didn't lock.\n");
290 
291 	buf[0]=2;
292 	buf[1]=0x20; // LOGC for optimal phase noise
293 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
294 	if (ret!=2)
295 		tuner_warn("i2c i/o error: rc == %d (should be 2)\n",ret);
296 }
297 
298 
mt2032_set_tv_freq(struct dvb_frontend * fe,struct analog_parameters * params)299 static int mt2032_set_tv_freq(struct dvb_frontend *fe,
300 			      struct analog_parameters *params)
301 {
302 	int if2,from,to;
303 
304 	// signal bandwidth and picture carrier
305 	if (params->std & V4L2_STD_525_60) {
306 		// NTSC
307 		from = 40750*1000;
308 		to   = 46750*1000;
309 		if2  = 45750*1000;
310 	} else {
311 		// PAL
312 		from = 32900*1000;
313 		to   = 39900*1000;
314 		if2  = 38900*1000;
315 	}
316 
317 	mt2032_set_if_freq(fe, params->frequency*62500,
318 			   1090*1000*1000, if2, from, to);
319 
320 	return 0;
321 }
322 
mt2032_set_radio_freq(struct dvb_frontend * fe,struct analog_parameters * params)323 static int mt2032_set_radio_freq(struct dvb_frontend *fe,
324 				 struct analog_parameters *params)
325 {
326 	struct microtune_priv *priv = fe->tuner_priv;
327 	int if2;
328 
329 	if (params->std & V4L2_STD_525_60) {
330 		tuner_dbg("pinnacle ntsc\n");
331 		if2 = 41300 * 1000;
332 	} else {
333 		tuner_dbg("pinnacle pal\n");
334 		if2 = 33300 * 1000;
335 	}
336 
337 	// per Manual for FM tuning: first if center freq. 1085 MHz
338 	mt2032_set_if_freq(fe, params->frequency * 125 / 2,
339 			   1085*1000*1000,if2,if2,if2);
340 
341 	return 0;
342 }
343 
mt2032_set_params(struct dvb_frontend * fe,struct analog_parameters * params)344 static int mt2032_set_params(struct dvb_frontend *fe,
345 			     struct analog_parameters *params)
346 {
347 	struct microtune_priv *priv = fe->tuner_priv;
348 	int ret = -EINVAL;
349 
350 	switch (params->mode) {
351 	case V4L2_TUNER_RADIO:
352 		ret = mt2032_set_radio_freq(fe, params);
353 		priv->frequency = params->frequency * 125 / 2;
354 		break;
355 	case V4L2_TUNER_ANALOG_TV:
356 	case V4L2_TUNER_DIGITAL_TV:
357 		ret = mt2032_set_tv_freq(fe, params);
358 		priv->frequency = params->frequency * 62500;
359 		break;
360 	}
361 
362 	return ret;
363 }
364 
365 static const struct dvb_tuner_ops mt2032_tuner_ops = {
366 	.set_analog_params = mt2032_set_params,
367 	.release           = microtune_release,
368 	.get_frequency     = microtune_get_frequency,
369 };
370 
371 // Initialization as described in "MT203x Programming Procedures", Rev 1.2, Feb.2001
mt2032_init(struct dvb_frontend * fe)372 static int mt2032_init(struct dvb_frontend *fe)
373 {
374 	struct microtune_priv *priv = fe->tuner_priv;
375 	unsigned char buf[21];
376 	int ret,xogc,xok=0;
377 
378 	// Initialize Registers per spec.
379 	buf[1]=2; // Index to register 2
380 	buf[2]=0xff;
381 	buf[3]=0x0f;
382 	buf[4]=0x1f;
383 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+1,4);
384 
385 	buf[5]=6; // Index register 6
386 	buf[6]=0xe4;
387 	buf[7]=0x8f;
388 	buf[8]=0xc3;
389 	buf[9]=0x4e;
390 	buf[10]=0xec;
391 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+5,6);
392 
393 	buf[12]=13;  // Index register 13
394 	buf[13]=0x32;
395 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+12,2);
396 
397 	// Adjust XOGC (register 7), wait for XOK
398 	xogc=7;
399 	do {
400 		tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
401 		mdelay(10);
402 		buf[0]=0x0e;
403 		tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
404 		tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
405 		xok=buf[0]&0x01;
406 		tuner_dbg("mt2032: xok = 0x%02x\n",xok);
407 		if (xok == 1) break;
408 
409 		xogc--;
410 		tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
411 		if (xogc == 3) {
412 			xogc=4; // min. 4 per spec
413 			break;
414 		}
415 		buf[0]=0x07;
416 		buf[1]=0x88 + xogc;
417 		ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
418 		if (ret!=2)
419 			tuner_warn("i2c i/o error: rc == %d (should be 2)\n",ret);
420 	} while (xok != 1 );
421 	priv->xogc=xogc;
422 
423 	memcpy(&fe->ops.tuner_ops, &mt2032_tuner_ops, sizeof(struct dvb_tuner_ops));
424 
425 	return(1);
426 }
427 
mt2050_set_antenna(struct dvb_frontend * fe,unsigned char antenna)428 static void mt2050_set_antenna(struct dvb_frontend *fe, unsigned char antenna)
429 {
430 	struct microtune_priv *priv = fe->tuner_priv;
431 	unsigned char buf[2];
432 
433 	buf[0] = 6;
434 	buf[1] = antenna ? 0x11 : 0x10;
435 	tuner_i2c_xfer_send(&priv->i2c_props, buf, 2);
436 	tuner_dbg("mt2050: enabled antenna connector %d\n", antenna);
437 }
438 
mt2050_set_if_freq(struct dvb_frontend * fe,unsigned int freq,unsigned int if2)439 static void mt2050_set_if_freq(struct dvb_frontend *fe,unsigned int freq, unsigned int if2)
440 {
441 	struct microtune_priv *priv = fe->tuner_priv;
442 	unsigned int if1=1218*1000*1000;
443 	unsigned int f_lo1,f_lo2,lo1,lo2,f_lo1_modulo,f_lo2_modulo,num1,num2,div1a,div1b,div2a,div2b;
444 	int ret;
445 	unsigned char buf[6];
446 
447 	tuner_dbg("mt2050_set_if_freq freq=%d if1=%d if2=%d\n",
448 		  freq,if1,if2);
449 
450 	f_lo1=freq+if1;
451 	f_lo1=(f_lo1/1000000)*1000000;
452 
453 	f_lo2=f_lo1-freq-if2;
454 	f_lo2=(f_lo2/50000)*50000;
455 
456 	lo1=f_lo1/4000000;
457 	lo2=f_lo2/4000000;
458 
459 	f_lo1_modulo= f_lo1-(lo1*4000000);
460 	f_lo2_modulo= f_lo2-(lo2*4000000);
461 
462 	num1=4*f_lo1_modulo/4000000;
463 	num2=4096*(f_lo2_modulo/1000)/4000;
464 
465 	// todo spurchecks
466 
467 	div1a=(lo1/12)-1;
468 	div1b=lo1-(div1a+1)*12;
469 
470 	div2a=(lo2/8)-1;
471 	div2b=lo2-(div2a+1)*8;
472 
473 	if (debug > 1) {
474 		tuner_dbg("lo1 lo2 = %d %d\n", lo1, lo2);
475 		tuner_dbg("num1 num2 div1a div1b div2a div2b= %x %x %x %x %x %x\n",
476 			  num1,num2,div1a,div1b,div2a,div2b);
477 	}
478 
479 	buf[0]=1;
480 	buf[1]= 4*div1b + num1;
481 	if(freq<275*1000*1000) buf[1] = buf[1]|0x80;
482 
483 	buf[2]=div1a;
484 	buf[3]=32*div2b + num2/256;
485 	buf[4]=num2-(num2/256)*256;
486 	buf[5]=div2a;
487 	if(num2!=0) buf[5]=buf[5]|0x40;
488 
489 	if (debug > 1)
490 		tuner_dbg("bufs is: %*ph\n", 6, buf);
491 
492 	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,6);
493 	if (ret!=6)
494 		tuner_warn("i2c i/o error: rc == %d (should be 6)\n",ret);
495 }
496 
mt2050_set_tv_freq(struct dvb_frontend * fe,struct analog_parameters * params)497 static int mt2050_set_tv_freq(struct dvb_frontend *fe,
498 			      struct analog_parameters *params)
499 {
500 	unsigned int if2;
501 
502 	if (params->std & V4L2_STD_525_60) {
503 		// NTSC
504 		if2 = 45750*1000;
505 	} else {
506 		// PAL
507 		if2 = 38900*1000;
508 	}
509 	if (V4L2_TUNER_DIGITAL_TV == params->mode) {
510 		// DVB (pinnacle 300i)
511 		if2 = 36150*1000;
512 	}
513 	mt2050_set_if_freq(fe, params->frequency*62500, if2);
514 	mt2050_set_antenna(fe, tv_antenna);
515 
516 	return 0;
517 }
518 
mt2050_set_radio_freq(struct dvb_frontend * fe,struct analog_parameters * params)519 static int mt2050_set_radio_freq(struct dvb_frontend *fe,
520 				 struct analog_parameters *params)
521 {
522 	struct microtune_priv *priv = fe->tuner_priv;
523 	int if2;
524 
525 	if (params->std & V4L2_STD_525_60) {
526 		tuner_dbg("pinnacle ntsc\n");
527 		if2 = 41300 * 1000;
528 	} else {
529 		tuner_dbg("pinnacle pal\n");
530 		if2 = 33300 * 1000;
531 	}
532 
533 	mt2050_set_if_freq(fe, params->frequency * 125 / 2, if2);
534 	mt2050_set_antenna(fe, radio_antenna);
535 
536 	return 0;
537 }
538 
mt2050_set_params(struct dvb_frontend * fe,struct analog_parameters * params)539 static int mt2050_set_params(struct dvb_frontend *fe,
540 			     struct analog_parameters *params)
541 {
542 	struct microtune_priv *priv = fe->tuner_priv;
543 	int ret = -EINVAL;
544 
545 	switch (params->mode) {
546 	case V4L2_TUNER_RADIO:
547 		ret = mt2050_set_radio_freq(fe, params);
548 		priv->frequency = params->frequency * 125 / 2;
549 		break;
550 	case V4L2_TUNER_ANALOG_TV:
551 	case V4L2_TUNER_DIGITAL_TV:
552 		ret = mt2050_set_tv_freq(fe, params);
553 		priv->frequency = params->frequency * 62500;
554 		break;
555 	}
556 
557 	return ret;
558 }
559 
560 static const struct dvb_tuner_ops mt2050_tuner_ops = {
561 	.set_analog_params = mt2050_set_params,
562 	.release           = microtune_release,
563 	.get_frequency     = microtune_get_frequency,
564 };
565 
mt2050_init(struct dvb_frontend * fe)566 static int mt2050_init(struct dvb_frontend *fe)
567 {
568 	struct microtune_priv *priv = fe->tuner_priv;
569 	unsigned char buf[2];
570 
571 	buf[0] = 6;
572 	buf[1] = 0x10;
573 	tuner_i2c_xfer_send(&priv->i2c_props, buf, 2); /* power */
574 
575 	buf[0] = 0x0f;
576 	buf[1] = 0x0f;
577 	tuner_i2c_xfer_send(&priv->i2c_props, buf, 2); /* m1lo */
578 
579 	buf[0] = 0x0d;
580 	tuner_i2c_xfer_send(&priv->i2c_props, buf, 1);
581 	tuner_i2c_xfer_recv(&priv->i2c_props, buf, 1);
582 
583 	tuner_dbg("mt2050: sro is %x\n", buf[0]);
584 
585 	memcpy(&fe->ops.tuner_ops, &mt2050_tuner_ops, sizeof(struct dvb_tuner_ops));
586 
587 	return 0;
588 }
589 
microtune_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c_adap,u8 i2c_addr)590 struct dvb_frontend *microtune_attach(struct dvb_frontend *fe,
591 				      struct i2c_adapter* i2c_adap,
592 				      u8 i2c_addr)
593 {
594 	struct microtune_priv *priv = NULL;
595 	char *name;
596 	unsigned char buf[21];
597 	int company_code;
598 
599 	priv = kzalloc(sizeof(struct microtune_priv), GFP_KERNEL);
600 	if (priv == NULL)
601 		return NULL;
602 	fe->tuner_priv = priv;
603 
604 	priv->i2c_props.addr = i2c_addr;
605 	priv->i2c_props.adap = i2c_adap;
606 	priv->i2c_props.name = "mt20xx";
607 
608 	//priv->radio_if2 = 10700 * 1000;	/* 10.7MHz - FM radio */
609 
610 	memset(buf,0,sizeof(buf));
611 
612 	name = "unknown";
613 
614 	tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
615 	tuner_i2c_xfer_recv(&priv->i2c_props,buf,21);
616 	if (debug)
617 		tuner_dbg("MT20xx hexdump: %*ph\n", 21, buf);
618 
619 	company_code = buf[0x11] << 8 | buf[0x12];
620 	tuner_info("microtune: companycode=%04x part=%02x rev=%02x\n",
621 		   company_code,buf[0x13],buf[0x14]);
622 
623 
624 	if (buf[0x13] < ARRAY_SIZE(microtune_part) &&
625 	    NULL != microtune_part[buf[0x13]])
626 		name = microtune_part[buf[0x13]];
627 	switch (buf[0x13]) {
628 	case MT2032:
629 		mt2032_init(fe);
630 		break;
631 	case MT2050:
632 		mt2050_init(fe);
633 		break;
634 	default:
635 		tuner_info("microtune %s found, not (yet?) supported, sorry :-/\n",
636 			   name);
637 		return NULL;
638 	}
639 
640 	strscpy(fe->ops.tuner_ops.info.name, name,
641 		sizeof(fe->ops.tuner_ops.info.name));
642 	tuner_info("microtune %s found, OK\n",name);
643 	return fe;
644 }
645 
646 EXPORT_SYMBOL_GPL(microtune_attach);
647 
648 MODULE_DESCRIPTION("Microtune tuner driver");
649 MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
650 MODULE_LICENSE("GPL");
651