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tda9887.c
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1 #include <linux/module.h>
2 #include <linux/kernel.h>
3 #include <linux/i2c.h>
4 #include <linux/types.h>
5 #include <linux/init.h>
6 #include <linux/errno.h>
7 #include <linux/delay.h>
8 #include <linux/videodev2.h>
9 #include <media/v4l2-common.h>
10 #include <media/tuner.h>
11 #include "tuner-i2c.h"
12 #include "tda9887.h"
13 
14 
15 /* Chips:
16  TDA9885 (PAL, NTSC)
17  TDA9886 (PAL, SECAM, NTSC)
18  TDA9887 (PAL, SECAM, NTSC, FM Radio)
19 
20  Used as part of several tuners
21 */
22 
23 static int debug;
24 module_param(debug, int, 0644);
25 MODULE_PARM_DESC(debug, "enable verbose debug messages");
26 
27 static DEFINE_MUTEX(tda9887_list_mutex);
28 static LIST_HEAD(hybrid_tuner_instance_list);
29 
30 struct tda9887_priv {
31  struct tuner_i2c_props i2c_props;
32  struct list_head hybrid_tuner_instance_list;
33 
34  unsigned char data[4];
35  unsigned int config;
36  unsigned int mode;
37  unsigned int audmode;
38  v4l2_std_id std;
39 
40  bool standby;
41 };
42 
43 /* ---------------------------------------------------------------------- */
44 
45 #define UNSET (-1U)
46 
47 struct tvnorm {
48  v4l2_std_id std;
49  char *name;
50  unsigned char b;
51  unsigned char c;
52  unsigned char e;
53 };
54 
55 /* ---------------------------------------------------------------------- */
56 
57 //
58 // TDA defines
59 //
60 
62 #define cVideoTrapBypassOFF 0x00 // bit b0
63 #define cVideoTrapBypassON 0x01 // bit b0
64 
65 #define cAutoMuteFmInactive 0x00 // bit b1
66 #define cAutoMuteFmActive 0x02 // bit b1
67 
68 #define cIntercarrier 0x00 // bit b2
69 #define cQSS 0x04 // bit b2
70 
71 #define cPositiveAmTV 0x00 // bit b3:4
72 #define cFmRadio 0x08 // bit b3:4
73 #define cNegativeFmTV 0x10 // bit b3:4
74 
75 
76 #define cForcedMuteAudioON 0x20 // bit b5
77 #define cForcedMuteAudioOFF 0x00 // bit b5
78 
79 #define cOutputPort1Active 0x00 // bit b6
80 #define cOutputPort1Inactive 0x40 // bit b6
81 
82 #define cOutputPort2Active 0x00 // bit b7
83 #define cOutputPort2Inactive 0x80 // bit b7
84 
85 
87 #define cDeemphasisOFF 0x00 // bit c5
88 #define cDeemphasisON 0x20 // bit c5
89 
90 #define cDeemphasis75 0x00 // bit c6
91 #define cDeemphasis50 0x40 // bit c6
92 
93 #define cAudioGain0 0x00 // bit c7
94 #define cAudioGain6 0x80 // bit c7
95 
96 #define cTopMask 0x1f // bit c0:4
97 #define cTopDefault 0x10 // bit c0:4
98 
100 #define cAudioIF_4_5 0x00 // bit e0:1
101 #define cAudioIF_5_5 0x01 // bit e0:1
102 #define cAudioIF_6_0 0x02 // bit e0:1
103 #define cAudioIF_6_5 0x03 // bit e0:1
104 
105 
106 #define cVideoIFMask 0x1c // bit e2:4
107 /* Video IF selection in TV Mode (bit B3=0) */
108 #define cVideoIF_58_75 0x00 // bit e2:4
109 #define cVideoIF_45_75 0x04 // bit e2:4
110 #define cVideoIF_38_90 0x08 // bit e2:4
111 #define cVideoIF_38_00 0x0C // bit e2:4
112 #define cVideoIF_33_90 0x10 // bit e2:4
113 #define cVideoIF_33_40 0x14 // bit e2:4
114 #define cRadioIF_45_75 0x18 // bit e2:4
115 #define cRadioIF_38_90 0x1C // bit e2:4
116 
117 /* IF1 selection in Radio Mode (bit B3=1) */
118 #define cRadioIF_33_30 0x00 // bit e2,4 (also 0x10,0x14)
119 #define cRadioIF_41_30 0x04 // bit e2,4
120 
121 /* Output of AFC pin in radio mode when bit E7=1 */
122 #define cRadioAGC_SIF 0x00 // bit e3
123 #define cRadioAGC_FM 0x08 // bit e3
124 
125 #define cTunerGainNormal 0x00 // bit e5
126 #define cTunerGainLow 0x20 // bit e5
127 
128 #define cGating_18 0x00 // bit e6
129 #define cGating_36 0x40 // bit e6
130 
131 #define cAgcOutON 0x80 // bit e7
132 #define cAgcOutOFF 0x00 // bit e7
133 
134 /* ---------------------------------------------------------------------- */
135 
136 static struct tvnorm tvnorms[] = {
137  {
138  .std = V4L2_STD_PAL_BG | V4L2_STD_PAL_H | V4L2_STD_PAL_N,
139  .name = "PAL-BGHN",
140  .b = ( cNegativeFmTV |
141  cQSS ),
142  .c = ( cDeemphasisON |
143  cDeemphasis50 |
144  cTopDefault),
145  .e = ( cGating_36 |
146  cAudioIF_5_5 |
147  cVideoIF_38_90 ),
148  },{
149  .std = V4L2_STD_PAL_I,
150  .name = "PAL-I",
151  .b = ( cNegativeFmTV |
152  cQSS ),
153  .c = ( cDeemphasisON |
154  cDeemphasis50 |
155  cTopDefault),
156  .e = ( cGating_36 |
157  cAudioIF_6_0 |
158  cVideoIF_38_90 ),
159  },{
160  .std = V4L2_STD_PAL_DK,
161  .name = "PAL-DK",
162  .b = ( cNegativeFmTV |
163  cQSS ),
164  .c = ( cDeemphasisON |
165  cDeemphasis50 |
166  cTopDefault),
167  .e = ( cGating_36 |
168  cAudioIF_6_5 |
169  cVideoIF_38_90 ),
170  },{
171  .std = V4L2_STD_PAL_M | V4L2_STD_PAL_Nc,
172  .name = "PAL-M/Nc",
173  .b = ( cNegativeFmTV |
174  cQSS ),
175  .c = ( cDeemphasisON |
176  cDeemphasis75 |
177  cTopDefault),
178  .e = ( cGating_36 |
179  cAudioIF_4_5 |
180  cVideoIF_45_75 ),
181  },{
182  .std = V4L2_STD_SECAM_B | V4L2_STD_SECAM_G | V4L2_STD_SECAM_H,
183  .name = "SECAM-BGH",
184  .b = ( cNegativeFmTV |
185  cQSS ),
186  .c = ( cTopDefault),
187  .e = ( cAudioIF_5_5 |
188  cVideoIF_38_90 ),
189  },{
190  .std = V4L2_STD_SECAM_L,
191  .name = "SECAM-L",
192  .b = ( cPositiveAmTV |
193  cQSS ),
194  .c = ( cTopDefault),
195  .e = ( cGating_36 |
196  cAudioIF_6_5 |
197  cVideoIF_38_90 ),
198  },{
199  .std = V4L2_STD_SECAM_LC,
200  .name = "SECAM-L'",
201  .b = ( cOutputPort2Inactive |
202  cPositiveAmTV |
203  cQSS ),
204  .c = ( cTopDefault),
205  .e = ( cGating_36 |
206  cAudioIF_6_5 |
207  cVideoIF_33_90 ),
208  },{
209  .std = V4L2_STD_SECAM_DK,
210  .name = "SECAM-DK",
211  .b = ( cNegativeFmTV |
212  cQSS ),
213  .c = ( cDeemphasisON |
214  cDeemphasis50 |
215  cTopDefault),
216  .e = ( cGating_36 |
217  cAudioIF_6_5 |
218  cVideoIF_38_90 ),
219  },{
220  .std = V4L2_STD_NTSC_M | V4L2_STD_NTSC_M_KR,
221  .name = "NTSC-M",
222  .b = ( cNegativeFmTV |
223  cQSS ),
224  .c = ( cDeemphasisON |
225  cDeemphasis75 |
226  cTopDefault),
227  .e = ( cGating_36 |
228  cAudioIF_4_5 |
229  cVideoIF_45_75 ),
230  },{
231  .std = V4L2_STD_NTSC_M_JP,
232  .name = "NTSC-M-JP",
233  .b = ( cNegativeFmTV |
234  cQSS ),
235  .c = ( cDeemphasisON |
236  cDeemphasis50 |
237  cTopDefault),
238  .e = ( cGating_36 |
239  cAudioIF_4_5 |
240  cVideoIF_58_75 ),
241  }
242 };
243 
244 static struct tvnorm radio_stereo = {
245  .name = "Radio Stereo",
246  .b = ( cFmRadio |
247  cQSS ),
248  .c = ( cDeemphasisOFF |
249  cAudioGain6 |
250  cTopDefault),
251  .e = ( cTunerGainLow |
252  cAudioIF_5_5 |
253  cRadioIF_38_90 ),
254 };
255 
256 static struct tvnorm radio_mono = {
257  .name = "Radio Mono",
258  .b = ( cFmRadio |
259  cQSS ),
260  .c = ( cDeemphasisON |
261  cDeemphasis75 |
262  cTopDefault),
263  .e = ( cTunerGainLow |
264  cAudioIF_5_5 |
265  cRadioIF_38_90 ),
266 };
267 
268 /* ---------------------------------------------------------------------- */
269 
270 static void dump_read_message(struct dvb_frontend *fe, unsigned char *buf)
271 {
272  struct tda9887_priv *priv = fe->analog_demod_priv;
273 
274  static char *afc[16] = {
275  "- 12.5 kHz",
276  "- 37.5 kHz",
277  "- 62.5 kHz",
278  "- 87.5 kHz",
279  "-112.5 kHz",
280  "-137.5 kHz",
281  "-162.5 kHz",
282  "-187.5 kHz [min]",
283  "+187.5 kHz [max]",
284  "+162.5 kHz",
285  "+137.5 kHz",
286  "+112.5 kHz",
287  "+ 87.5 kHz",
288  "+ 62.5 kHz",
289  "+ 37.5 kHz",
290  "+ 12.5 kHz",
291  };
292  tuner_info("read: 0x%2x\n", buf[0]);
293  tuner_info(" after power on : %s\n", (buf[0] & 0x01) ? "yes" : "no");
294  tuner_info(" afc : %s\n", afc[(buf[0] >> 1) & 0x0f]);
295  tuner_info(" fmif level : %s\n", (buf[0] & 0x20) ? "high" : "low");
296  tuner_info(" afc window : %s\n", (buf[0] & 0x40) ? "in" : "out");
297  tuner_info(" vfi level : %s\n", (buf[0] & 0x80) ? "high" : "low");
298 }
299 
300 static void dump_write_message(struct dvb_frontend *fe, unsigned char *buf)
301 {
302  struct tda9887_priv *priv = fe->analog_demod_priv;
303 
304  static char *sound[4] = {
305  "AM/TV",
306  "FM/radio",
307  "FM/TV",
308  "FM/radio"
309  };
310  static char *adjust[32] = {
311  "-16", "-15", "-14", "-13", "-12", "-11", "-10", "-9",
312  "-8", "-7", "-6", "-5", "-4", "-3", "-2", "-1",
313  "0", "+1", "+2", "+3", "+4", "+5", "+6", "+7",
314  "+8", "+9", "+10", "+11", "+12", "+13", "+14", "+15"
315  };
316  static char *deemph[4] = {
317  "no", "no", "75", "50"
318  };
319  static char *carrier[4] = {
320  "4.5 MHz",
321  "5.5 MHz",
322  "6.0 MHz",
323  "6.5 MHz / AM"
324  };
325  static char *vif[8] = {
326  "58.75 MHz",
327  "45.75 MHz",
328  "38.9 MHz",
329  "38.0 MHz",
330  "33.9 MHz",
331  "33.4 MHz",
332  "45.75 MHz + pin13",
333  "38.9 MHz + pin13",
334  };
335  static char *rif[4] = {
336  "44 MHz",
337  "52 MHz",
338  "52 MHz",
339  "44 MHz",
340  };
341 
342  tuner_info("write: byte B 0x%02x\n", buf[1]);
343  tuner_info(" B0 video mode : %s\n",
344  (buf[1] & 0x01) ? "video trap" : "sound trap");
345  tuner_info(" B1 auto mute fm : %s\n",
346  (buf[1] & 0x02) ? "yes" : "no");
347  tuner_info(" B2 carrier mode : %s\n",
348  (buf[1] & 0x04) ? "QSS" : "Intercarrier");
349  tuner_info(" B3-4 tv sound/radio : %s\n",
350  sound[(buf[1] & 0x18) >> 3]);
351  tuner_info(" B5 force mute audio: %s\n",
352  (buf[1] & 0x20) ? "yes" : "no");
353  tuner_info(" B6 output port 1 : %s\n",
354  (buf[1] & 0x40) ? "high (inactive)" : "low (active)");
355  tuner_info(" B7 output port 2 : %s\n",
356  (buf[1] & 0x80) ? "high (inactive)" : "low (active)");
357 
358  tuner_info("write: byte C 0x%02x\n", buf[2]);
359  tuner_info(" C0-4 top adjustment : %s dB\n",
360  adjust[buf[2] & 0x1f]);
361  tuner_info(" C5-6 de-emphasis : %s\n",
362  deemph[(buf[2] & 0x60) >> 5]);
363  tuner_info(" C7 audio gain : %s\n",
364  (buf[2] & 0x80) ? "-6" : "0");
365 
366  tuner_info("write: byte E 0x%02x\n", buf[3]);
367  tuner_info(" E0-1 sound carrier : %s\n",
368  carrier[(buf[3] & 0x03)]);
369  tuner_info(" E6 l pll gating : %s\n",
370  (buf[3] & 0x40) ? "36" : "13");
371 
372  if (buf[1] & 0x08) {
373  /* radio */
374  tuner_info(" E2-4 video if : %s\n",
375  rif[(buf[3] & 0x0c) >> 2]);
376  tuner_info(" E7 vif agc output : %s\n",
377  (buf[3] & 0x80)
378  ? ((buf[3] & 0x10) ? "fm-agc radio" :
379  "sif-agc radio")
380  : "fm radio carrier afc");
381  } else {
382  /* video */
383  tuner_info(" E2-4 video if : %s\n",
384  vif[(buf[3] & 0x1c) >> 2]);
385  tuner_info(" E5 tuner gain : %s\n",
386  (buf[3] & 0x80)
387  ? ((buf[3] & 0x20) ? "external" : "normal")
388  : ((buf[3] & 0x20) ? "minimum" : "normal"));
389  tuner_info(" E7 vif agc output : %s\n",
390  (buf[3] & 0x80) ? ((buf[3] & 0x20)
391  ? "pin3 port, pin22 vif agc out"
392  : "pin22 port, pin3 vif acg ext in")
393  : "pin3+pin22 port");
394  }
395  tuner_info("--\n");
396 }
397 
398 /* ---------------------------------------------------------------------- */
399 
400 static int tda9887_set_tvnorm(struct dvb_frontend *fe)
401 {
402  struct tda9887_priv *priv = fe->analog_demod_priv;
403  struct tvnorm *norm = NULL;
404  char *buf = priv->data;
405  int i;
406 
407  if (priv->mode == V4L2_TUNER_RADIO) {
408  if (priv->audmode == V4L2_TUNER_MODE_MONO)
409  norm = &radio_mono;
410  else
411  norm = &radio_stereo;
412  } else {
413  for (i = 0; i < ARRAY_SIZE(tvnorms); i++) {
414  if (tvnorms[i].std & priv->std) {
415  norm = tvnorms+i;
416  break;
417  }
418  }
419  }
420  if (NULL == norm) {
421  tuner_dbg("Unsupported tvnorm entry - audio muted\n");
422  return -1;
423  }
424 
425  tuner_dbg("configure for: %s\n", norm->name);
426  buf[1] = norm->b;
427  buf[2] = norm->c;
428  buf[3] = norm->e;
429  return 0;
430 }
431 
432 static unsigned int port1 = UNSET;
433 static unsigned int port2 = UNSET;
434 static unsigned int qss = UNSET;
435 static unsigned int adjust = UNSET;
436 
437 module_param(port1, int, 0644);
438 module_param(port2, int, 0644);
439 module_param(qss, int, 0644);
440 module_param(adjust, int, 0644);
441 
442 static int tda9887_set_insmod(struct dvb_frontend *fe)
443 {
444  struct tda9887_priv *priv = fe->analog_demod_priv;
445  char *buf = priv->data;
446 
447  if (UNSET != port1) {
448  if (port1)
449  buf[1] |= cOutputPort1Inactive;
450  else
451  buf[1] &= ~cOutputPort1Inactive;
452  }
453  if (UNSET != port2) {
454  if (port2)
455  buf[1] |= cOutputPort2Inactive;
456  else
457  buf[1] &= ~cOutputPort2Inactive;
458  }
459 
460  if (UNSET != qss) {
461  if (qss)
462  buf[1] |= cQSS;
463  else
464  buf[1] &= ~cQSS;
465  }
466 
467  if (adjust < 0x20) {
468  buf[2] &= ~cTopMask;
469  buf[2] |= adjust;
470  }
471  return 0;
472 }
473 
474 static int tda9887_do_config(struct dvb_frontend *fe)
475 {
476  struct tda9887_priv *priv = fe->analog_demod_priv;
477  char *buf = priv->data;
478 
479  if (priv->config & TDA9887_PORT1_ACTIVE)
480  buf[1] &= ~cOutputPort1Inactive;
481  if (priv->config & TDA9887_PORT1_INACTIVE)
482  buf[1] |= cOutputPort1Inactive;
483  if (priv->config & TDA9887_PORT2_ACTIVE)
484  buf[1] &= ~cOutputPort2Inactive;
485  if (priv->config & TDA9887_PORT2_INACTIVE)
486  buf[1] |= cOutputPort2Inactive;
487 
488  if (priv->config & TDA9887_QSS)
489  buf[1] |= cQSS;
490  if (priv->config & TDA9887_INTERCARRIER)
491  buf[1] &= ~cQSS;
492 
493  if (priv->config & TDA9887_AUTOMUTE)
494  buf[1] |= cAutoMuteFmActive;
495  if (priv->config & TDA9887_DEEMPHASIS_MASK) {
496  buf[2] &= ~0x60;
497  switch (priv->config & TDA9887_DEEMPHASIS_MASK) {
498  case TDA9887_DEEMPHASIS_NONE:
499  buf[2] |= cDeemphasisOFF;
500  break;
501  case TDA9887_DEEMPHASIS_50:
502  buf[2] |= cDeemphasisON | cDeemphasis50;
503  break;
504  case TDA9887_DEEMPHASIS_75:
505  buf[2] |= cDeemphasisON | cDeemphasis75;
506  break;
507  }
508  }
509  if (priv->config & TDA9887_TOP_SET) {
510  buf[2] &= ~cTopMask;
511  buf[2] |= (priv->config >> 8) & cTopMask;
512  }
513  if ((priv->config & TDA9887_INTERCARRIER_NTSC) &&
514  (priv->std & V4L2_STD_NTSC))
515  buf[1] &= ~cQSS;
516  if (priv->config & TDA9887_GATING_18)
517  buf[3] &= ~cGating_36;
518 
519  if (priv->mode == V4L2_TUNER_RADIO) {
520  if (priv->config & TDA9887_RIF_41_3) {
521  buf[3] &= ~cVideoIFMask;
522  buf[3] |= cRadioIF_41_30;
523  }
524  if (priv->config & TDA9887_GAIN_NORMAL)
525  buf[3] &= ~cTunerGainLow;
526  }
527 
528  return 0;
529 }
530 
531 /* ---------------------------------------------------------------------- */
532 
533 static int tda9887_status(struct dvb_frontend *fe)
534 {
535  struct tda9887_priv *priv = fe->analog_demod_priv;
536  unsigned char buf[1];
537  int rc;
538 
539  memset(buf,0,sizeof(buf));
540  if (1 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props,buf,1)))
541  tuner_info("i2c i/o error: rc == %d (should be 1)\n", rc);
542  dump_read_message(fe, buf);
543  return 0;
544 }
545 
546 static void tda9887_configure(struct dvb_frontend *fe)
547 {
548  struct tda9887_priv *priv = fe->analog_demod_priv;
549  int rc;
550 
551  memset(priv->data,0,sizeof(priv->data));
552  tda9887_set_tvnorm(fe);
553 
554  /* A note on the port settings:
555  These settings tend to depend on the specifics of the board.
556  By default they are set to inactive (bit value 1) by this driver,
557  overwriting any changes made by the tvnorm. This means that it
558  is the responsibility of the module using the tda9887 to set
559  these values in case of changes in the tvnorm.
560  In many cases port 2 should be made active (0) when selecting
561  SECAM-L, and port 2 should remain inactive (1) for SECAM-L'.
562 
563  For the other standards the tda9887 application note says that
564  the ports should be set to active (0), but, again, that may
565  differ depending on the precise hardware configuration.
566  */
567  priv->data[1] |= cOutputPort1Inactive;
568  priv->data[1] |= cOutputPort2Inactive;
569 
570  tda9887_do_config(fe);
571  tda9887_set_insmod(fe);
572 
573  if (priv->standby)
574  priv->data[1] |= cForcedMuteAudioON;
575 
576  tuner_dbg("writing: b=0x%02x c=0x%02x e=0x%02x\n",
577  priv->data[1], priv->data[2], priv->data[3]);
578  if (debug > 1)
579  dump_write_message(fe, priv->data);
580 
581  if (4 != (rc = tuner_i2c_xfer_send(&priv->i2c_props,priv->data,4)))
582  tuner_info("i2c i/o error: rc == %d (should be 4)\n", rc);
583 
584  if (debug > 2) {
585  msleep_interruptible(1000);
586  tda9887_status(fe);
587  }
588 }
589 
590 /* ---------------------------------------------------------------------- */
591 
592 static void tda9887_tuner_status(struct dvb_frontend *fe)
593 {
594  struct tda9887_priv *priv = fe->analog_demod_priv;
595  tuner_info("Data bytes: b=0x%02x c=0x%02x e=0x%02x\n",
596  priv->data[1], priv->data[2], priv->data[3]);
597 }
598 
599 static int tda9887_get_afc(struct dvb_frontend *fe)
600 {
601  struct tda9887_priv *priv = fe->analog_demod_priv;
602  static int AFC_BITS_2_kHz[] = {
603  -12500, -37500, -62500, -97500,
604  -112500, -137500, -162500, -187500,
605  187500, 162500, 137500, 112500,
606  97500 , 62500, 37500 , 12500
607  };
608  int afc=0;
609  __u8 reg = 0;
610 
611  if (1 == tuner_i2c_xfer_recv(&priv->i2c_props,&reg,1))
612  afc = AFC_BITS_2_kHz[(reg>>1)&0x0f];
613 
614  return afc;
615 }
616 
617 static void tda9887_standby(struct dvb_frontend *fe)
618 {
619  struct tda9887_priv *priv = fe->analog_demod_priv;
620 
621  priv->standby = true;
622 
623  tda9887_configure(fe);
624 }
625 
626 static void tda9887_set_params(struct dvb_frontend *fe,
627  struct analog_parameters *params)
628 {
629  struct tda9887_priv *priv = fe->analog_demod_priv;
630 
631  priv->standby = false;
632  priv->mode = params->mode;
633  priv->audmode = params->audmode;
634  priv->std = params->std;
635  tda9887_configure(fe);
636 }
637 
638 static int tda9887_set_config(struct dvb_frontend *fe, void *priv_cfg)
639 {
640  struct tda9887_priv *priv = fe->analog_demod_priv;
641 
642  priv->config = *(unsigned int *)priv_cfg;
643  tda9887_configure(fe);
644 
645  return 0;
646 }
647 
648 static void tda9887_release(struct dvb_frontend *fe)
649 {
650  struct tda9887_priv *priv = fe->analog_demod_priv;
651 
652  mutex_lock(&tda9887_list_mutex);
653 
654  if (priv)
655  hybrid_tuner_release_state(priv);
656 
657  mutex_unlock(&tda9887_list_mutex);
658 
659  fe->analog_demod_priv = NULL;
660 }
661 
662 static struct analog_demod_ops tda9887_ops = {
663  .info = {
664  .name = "tda9887",
665  },
666  .set_params = tda9887_set_params,
667  .standby = tda9887_standby,
668  .tuner_status = tda9887_tuner_status,
669  .get_afc = tda9887_get_afc,
670  .release = tda9887_release,
671  .set_config = tda9887_set_config,
672 };
673 
674 struct dvb_frontend *tda9887_attach(struct dvb_frontend *fe,
675  struct i2c_adapter *i2c_adap,
676  u8 i2c_addr)
677 {
678  struct tda9887_priv *priv = NULL;
679  int instance;
680 
681  mutex_lock(&tda9887_list_mutex);
682 
683  instance = hybrid_tuner_request_state(struct tda9887_priv, priv,
684  hybrid_tuner_instance_list,
685  i2c_adap, i2c_addr, "tda9887");
686  switch (instance) {
687  case 0:
688  mutex_unlock(&tda9887_list_mutex);
689  return NULL;
690  case 1:
691  fe->analog_demod_priv = priv;
692  priv->standby = true;
693  tuner_info("tda988[5/6/7] found\n");
694  break;
695  default:
696  fe->analog_demod_priv = priv;
697  break;
698  }
699 
700  mutex_unlock(&tda9887_list_mutex);
701 
702  memcpy(&fe->ops.analog_ops, &tda9887_ops,
703  sizeof(struct analog_demod_ops));
704 
705  return fe;
706 }
707 EXPORT_SYMBOL_GPL(tda9887_attach);
708 
709 MODULE_LICENSE("GPL");
710 
711 /*
712  * Overrides for Emacs so that we follow Linus's tabbing style.
713  * ---------------------------------------------------------------------------
714  * Local variables:
715  * c-basic-offset: 8
716  * End:
717  */
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