1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>struct tuner_params</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="mediadev.html#id-1.8.2" title="Video2Linux devices"><link rel="prev" href="API-struct-tuner-range.html" title="struct tuner_range"><link rel="next" href="API-enum-tveeprom-audio-processor.html" title="enum tveeprom_audio_processor"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct tuner_params</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-tuner-range.html">Prev</a> </td><th width="60%" align="center">Video2Linux devices</th><td width="20%" align="right"> <a accesskey="n" href="API-enum-tveeprom-audio-processor.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-tuner-params"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct tuner_params — 2 Parameters to be used to setup the tuner. Those are used by drivers/media/tuners/tuner-types.c in order to specify the tuner properties. Most of the parameters are for tuners based on tda9887 IF-PLL multi-standard analog TV/Radio demodulator, with is very common on legacy analog tuners. 3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting"> 4struct tuner_params { 5 enum param_type type; 6 unsigned int cb_first_if_lower_freq:1; 7 unsigned int has_tda9887:1; 8 unsigned int port1_fm_high_sensitivity:1; 9 unsigned int port2_fm_high_sensitivity:1; 10 unsigned int fm_gain_normal:1; 11 unsigned int intercarrier_mode:1; 12 unsigned int port1_active:1; 13 unsigned int port2_active:1; 14 unsigned int port1_invert_for_secam_lc:1; 15 unsigned int port2_invert_for_secam_lc:1; 16 unsigned int port1_set_for_fm_mono:1; 17 unsigned int default_pll_gating_18:1; 18 unsigned int radio_if:2; 19 signed int default_top_low:5; 20 signed int default_top_mid:5; 21 signed int default_top_high:5; 22 signed int default_top_secam_low:5; 23 signed int default_top_secam_mid:5; 24 signed int default_top_secam_high:5; 25 u16 iffreq; 26 unsigned int count; 27 struct tuner_range * ranges; 28}; </pre></div><div class="refsect1"><a name="id-1.8.2.6.5"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">type</span></dt><dd><p> 29 Type of the tuner parameters, as defined at 30 enum param_type. If the tuner supports multiple 31 standards, an array should be used, with one 32 row per different standard. 33 </p></dd><dt><span class="term">cb_first_if_lower_freq</span></dt><dd><p> 34 Many Philips-based tuners have a comment in 35 their datasheet like 36 <span class="quote">“<span class="quote">For channel selection involving band 37 switching, and to ensure smooth tuning to the 38 desired channel without causing unnecessary 39 charge pump action, it is recommended to 40 consider the difference between wanted channel 41 frequency and the current channel frequency. 42 Unnecessary charge pump action will result 43 in very low tuning voltage which may drive the 44 oscillator to extreme conditions</span>”</span>. 45 Set cb_first_if_lower_freq to 1, if this check 46 is required for this tuner. I tested this for 47 PAL by first setting the TV frequency to 48 203 MHz and then switching to 96.6 MHz FM 49 radio. The result was static unless the 50 control byte was sent first. 51 </p></dd><dt><span class="term">has_tda9887</span></dt><dd><p> 52 Set to 1 if this tuner uses a tda9887 53 </p></dd><dt><span class="term">port1_fm_high_sensitivity</span></dt><dd><p> 54 Many Philips tuners use tda9887 PORT1 to select 55 the FM radio sensitivity. If this setting is 1, 56 then set PORT1 to 1 to get proper FM reception. 57 </p></dd><dt><span class="term">port2_fm_high_sensitivity</span></dt><dd><p> 58 Some Philips tuners use tda9887 PORT2 to select 59 the FM radio sensitivity. If this setting is 1, 60 then set PORT2 to 1 to get proper FM reception. 61 </p></dd><dt><span class="term">fm_gain_normal</span></dt><dd><p> 62 Some Philips tuners use tda9887 cGainNormal to 63 select the FM radio sensitivity. If this 64 setting is 1, e register will use cGainNormal 65 instead of cGainLow. 66 </p></dd><dt><span class="term">intercarrier_mode</span></dt><dd><p> 67 Most tuners with a tda9887 use QSS mode. 68 Some (cheaper) tuners use Intercarrier mode. 69 If this setting is 1, then the tuner needs to 70 be set to intercarrier mode. 71 </p></dd><dt><span class="term">port1_active</span></dt><dd><p> 72 This setting sets the default value for PORT1. 73 0 means inactive, 1 means active. Note: the 74 actual bit value written to the tda9887 is 75 inverted. So a 0 here means a 1 in the B6 bit. 76 </p></dd><dt><span class="term">port2_active</span></dt><dd><p> 77 This setting sets the default value for PORT2. 78 0 means inactive, 1 means active. Note: the 79 actual bit value written to the tda9887 is 80 inverted. So a 0 here means a 1 in the B7 bit. 81 </p></dd><dt><span class="term">port1_invert_for_secam_lc</span></dt><dd><p> 82 Sometimes PORT1 is inverted when the SECAM-L' 83 standard is selected. Set this bit to 1 if this 84 is needed. 85 </p></dd><dt><span class="term">port2_invert_for_secam_lc</span></dt><dd><p> 86 Sometimes PORT2 is inverted when the SECAM-L' 87 standard is selected. Set this bit to 1 if this 88 is needed. 89 </p></dd><dt><span class="term">port1_set_for_fm_mono</span></dt><dd><p> 90 Some cards require PORT1 to be 1 for mono Radio 91 FM and 0 for stereo. 92 </p></dd><dt><span class="term">default_pll_gating_18</span></dt><dd><p> 93 Select 18% (or according to datasheet 0%) 94 L standard PLL gating, vs the driver default 95 of 36%. 96 </p></dd><dt><span class="term">radio_if</span></dt><dd><p> 97 IF to use in radio mode. Tuners with a 98 separate radio IF filter seem to use 10.7, 99 while those without use 33.3 for PAL/SECAM 100 tuners and 41.3 for NTSC tuners. 101 0 = 10.7, 1 = 33.3, 2 = 41.3 102 </p></dd><dt><span class="term">default_top_low</span></dt><dd><p> 103 Default tda9887 TOP value in dB for the low 104 band. Default is 0. Range: -16:+15 105 </p></dd><dt><span class="term">default_top_mid</span></dt><dd><p> 106 Default tda9887 TOP value in dB for the mid 107 band. Default is 0. Range: -16:+15 108 </p></dd><dt><span class="term">default_top_high</span></dt><dd><p> 109 Default tda9887 TOP value in dB for the high 110 band. Default is 0. Range: -16:+15 111 </p></dd><dt><span class="term">default_top_secam_low</span></dt><dd><p> 112 Default tda9887 TOP value in dB for SECAM-L/L' 113 for the low band. Default is 0. Several tuners 114 require a different TOP value for the 115 SECAM-L/L' standards. Range: -16:+15 116 </p></dd><dt><span class="term">default_top_secam_mid</span></dt><dd><p> 117 Default tda9887 TOP value in dB for SECAM-L/L' 118 for the mid band. Default is 0. Several tuners 119 require a different TOP value for the 120 SECAM-L/L' standards. Range: -16:+15 121 </p></dd><dt><span class="term">default_top_secam_high</span></dt><dd><p> 122 Default tda9887 TOP value in dB for SECAM-L/L' 123 for the high band. Default is 0. Several tuners 124 require a different TOP value for the 125 SECAM-L/L' standards. Range: -16:+15 126 </p></dd><dt><span class="term">iffreq</span></dt><dd><p> 127 Intermediate frequency (IF) used by the tuner 128 on digital mode. 129 </p></dd><dt><span class="term">count</span></dt><dd><p> 130 Size of the ranges array. 131 </p></dd><dt><span class="term">ranges</span></dt><dd><p> 132 Array with the frequency ranges supported by 133 the tuner. 134 </p></dd></dl></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-tuner-range.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="mediadev.html#id-1.8.2">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-enum-tveeprom-audio-processor.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct tuner_range</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">enum tveeprom_audio_processor</span></td></tr></table></div></body></html> 135