Based on kernel version 4.7.2. Page generated on 2016-08-22 22:44 EST.
1 <refentry id="FE_GET_INFO"> 2 <refmeta> 3 <refentrytitle>ioctl FE_GET_INFO</refentrytitle> 4 &manvol; 5 </refmeta> 6 7 <refnamediv> 8 <refname>FE_GET_INFO</refname> 9 <refpurpose>Query DVB frontend capabilities and returns information about 10 the front-end. This call only requires read-only access to the device</refpurpose> 11 </refnamediv> 12 13 <refsynopsisdiv> 14 <funcsynopsis> 15 <funcprototype> 16 <funcdef>int <function>ioctl</function></funcdef> 17 <paramdef>int <parameter>fd</parameter></paramdef> 18 <paramdef>int <parameter>request</parameter></paramdef> 19 <paramdef>struct dvb_frontend_info *<parameter>argp</parameter></paramdef> 20 </funcprototype> 21 </funcsynopsis> 22 </refsynopsisdiv> 23 24 <refsect1> 25 <title>Arguments</title> 26 <variablelist> 27 <varlistentry> 28 <term><parameter>fd</parameter></term> 29 <listitem> 30 <para>&fe_fd;</para> 31 </listitem> 32 </varlistentry> 33 <varlistentry> 34 <term><parameter>request</parameter></term> 35 <listitem> 36 <para>FE_GET_INFO</para> 37 </listitem> 38 </varlistentry> 39 <varlistentry> 40 <term><parameter>argp</parameter></term> 41 <listitem> 42 <para>pointer to struct &dvb-frontend-info;</para> 43 </listitem> 44 </varlistentry> 45 </variablelist> 46 </refsect1> 47 48 <refsect1> 49 <title>Description</title> 50 51 <para>All DVB frontend devices support the 52 <constant>FE_GET_INFO</constant> ioctl. It is used to identify 53 kernel devices compatible with this specification and to obtain 54 information about driver and hardware capabilities. The ioctl takes a 55 pointer to dvb_frontend_info which is filled by the driver. When the 56 driver is not compatible with this specification the ioctl returns an error. 57 </para> 58 &return-value-dvb; 59 60 <table pgwide="1" frame="none" id="dvb-frontend-info"> 61 <title>struct <structname>dvb_frontend_info</structname></title> 62 <tgroup cols="3"> 63 &cs-str; 64 <tbody valign="top"> 65 <row> 66 <entry>char</entry> 67 <entry>name[128]</entry> 68 <entry>Name of the frontend</entry> 69 </row><row> 70 <entry>fe_type_t</entry> 71 <entry>type</entry> 72 <entry><emphasis role="bold">DEPRECATED</emphasis>. DVBv3 type. Should not be used on modern programs, as a 73 frontend may have more than one type. So, the DVBv5 API should 74 be used instead to enumerate and select the frontend type.</entry> 75 </row><row> 76 <entry>uint32_t</entry> 77 <entry>frequency_min</entry> 78 <entry>Minimal frequency supported by the frontend</entry> 79 </row><row> 80 <entry>uint32_t</entry> 81 <entry>frequency_max</entry> 82 <entry>Maximal frequency supported by the frontend</entry> 83 </row><row> 84 <entry>uint32_t</entry> 85 <entry>frequency_stepsize</entry> 86 <entry>Frequency step - all frequencies are multiple of this value</entry> 87 </row><row> 88 <entry>uint32_t</entry> 89 <entry>frequency_tolerance</entry> 90 <entry>Tolerance of the frequency</entry> 91 </row><row> 92 <entry>uint32_t</entry> 93 <entry>symbol_rate_min</entry> 94 <entry>Minimal symbol rate (for Cable/Satellite systems), in bauds</entry> 95 </row><row> 96 <entry>uint32_t</entry> 97 <entry>symbol_rate_max</entry> 98 <entry>Maximal symbol rate (for Cable/Satellite systems), in bauds</entry> 99 </row><row> 100 <entry>uint32_t</entry> 101 <entry>symbol_rate_tolerance</entry> 102 <entry>Maximal symbol rate tolerance, in ppm</entry> 103 </row><row> 104 <entry>uint32_t</entry> 105 <entry>notifier_delay</entry> 106 <entry><emphasis role="bold">DEPRECATED</emphasis>. Not used by any driver.</entry> 107 </row><row> 108 <entry>&fe-caps;</entry> 109 <entry>caps</entry> 110 <entry>Capabilities supported by the frontend</entry> 111 </row> 112 </tbody> 113 </tgroup> 114 </table> 115 116 <para>NOTE: The frequencies are specified in Hz for Terrestrial and Cable 117 systems. They're specified in kHz for Satellite systems</para> 118 </refsect1> 119 120 <refsect1 id="fe-caps-t"> 121 <title>frontend capabilities</title> 122 123 <para>Capabilities describe what a frontend can do. Some capabilities are 124 supported only on some specific frontend types.</para> 125 126 <table pgwide="1" frame="none" id="fe-caps"> 127 <title>enum fe_caps</title> 128 <tgroup cols="2"> 129 &cs-def; 130 <thead> 131 <row> 132 <entry>ID</entry> 133 <entry>Description</entry> 134 </row> 135 </thead> 136 <tbody valign="top"> 137 <row> 138 <entry id="FE-IS-STUPID"><constant>FE_IS_STUPID</constant></entry> 139 <entry>There's something wrong at the frontend, and it can't 140 report its capabilities</entry> 141 </row> 142 <row> 143 <entry id="FE-CAN-INVERSION-AUTO"><constant>FE_CAN_INVERSION_AUTO</constant></entry> 144 <entry>The frontend is capable of auto-detecting inversion</entry> 145 </row> 146 <row> 147 <entry id="FE-CAN-FEC-1-2"><constant>FE_CAN_FEC_1_2</constant></entry> 148 <entry>The frontend supports FEC 1/2</entry> 149 </row> 150 <row> 151 <entry id="FE-CAN-FEC-2-3"><constant>FE_CAN_FEC_2_3</constant></entry> 152 <entry>The frontend supports FEC 2/3</entry> 153 </row> 154 <row> 155 <entry id="FE-CAN-FEC-3-4"><constant>FE_CAN_FEC_3_4</constant></entry> 156 <entry>The frontend supports FEC 3/4</entry> 157 </row> 158 <row> 159 <entry id="FE-CAN-FEC-4-5"><constant>FE_CAN_FEC_4_5</constant></entry> 160 <entry>The frontend supports FEC 4/5</entry> 161 </row> 162 <row> 163 <entry id="FE-CAN-FEC-5-6"><constant>FE_CAN_FEC_5_6</constant></entry> 164 <entry>The frontend supports FEC 5/6</entry> 165 </row> 166 <row> 167 <entry id="FE-CAN-FEC-6-7"><constant>FE_CAN_FEC_6_7</constant></entry> 168 <entry>The frontend supports FEC 6/7</entry> 169 </row> 170 <row> 171 <entry id="FE-CAN-FEC-7-8"><constant>FE_CAN_FEC_7_8</constant></entry> 172 <entry>The frontend supports FEC 7/8</entry> 173 </row> 174 <row> 175 <entry id="FE-CAN-FEC-8-9"><constant>FE_CAN_FEC_8_9</constant></entry> 176 <entry>The frontend supports FEC 8/9</entry> 177 </row> 178 <row> 179 <entry id="FE-CAN-FEC-AUTO"><constant>FE_CAN_FEC_AUTO</constant></entry> 180 <entry>The frontend can autodetect FEC.</entry> 181 </row> 182 <row> 183 <entry id="FE-CAN-QPSK"><constant>FE_CAN_QPSK</constant></entry> 184 <entry>The frontend supports QPSK modulation</entry> 185 </row> 186 <row> 187 <entry id="FE-CAN-QAM-16"><constant>FE_CAN_QAM_16</constant></entry> 188 <entry>The frontend supports 16-QAM modulation</entry> 189 </row> 190 <row> 191 <entry id="FE-CAN-QAM-32"><constant>FE_CAN_QAM_32</constant></entry> 192 <entry>The frontend supports 32-QAM modulation</entry> 193 </row> 194 <row> 195 <entry id="FE-CAN-QAM-64"><constant>FE_CAN_QAM_64</constant></entry> 196 <entry>The frontend supports 64-QAM modulation</entry> 197 </row> 198 <row> 199 <entry id="FE-CAN-QAM-128"><constant>FE_CAN_QAM_128</constant></entry> 200 <entry>The frontend supports 128-QAM modulation</entry> 201 </row> 202 <row> 203 <entry id="FE-CAN-QAM-256"><constant>FE_CAN_QAM_256</constant></entry> 204 <entry>The frontend supports 256-QAM modulation</entry> 205 </row> 206 <row> 207 <entry id="FE-CAN-QAM-AUTO"><constant>FE_CAN_QAM_AUTO</constant></entry> 208 <entry>The frontend can autodetect modulation</entry> 209 </row> 210 <row> 211 <entry id="FE-CAN-TRANSMISSION-MODE-AUTO"><constant>FE_CAN_TRANSMISSION_MODE_AUTO</constant></entry> 212 <entry>The frontend can autodetect the transmission mode</entry> 213 </row> 214 <row> 215 <entry id="FE-CAN-BANDWIDTH-AUTO"><constant>FE_CAN_BANDWIDTH_AUTO</constant></entry> 216 <entry>The frontend can autodetect the bandwidth</entry> 217 </row> 218 <row> 219 <entry id="FE-CAN-GUARD-INTERVAL-AUTO"><constant>FE_CAN_GUARD_INTERVAL_AUTO</constant></entry> 220 <entry>The frontend can autodetect the guard interval</entry> 221 </row> 222 <row> 223 <entry id="FE-CAN-HIERARCHY-AUTO"><constant>FE_CAN_HIERARCHY_AUTO</constant></entry> 224 <entry>The frontend can autodetect hierarch</entry> 225 </row> 226 <row> 227 <entry id="FE-CAN-8VSB"><constant>FE_CAN_8VSB</constant></entry> 228 <entry>The frontend supports 8-VSB modulation</entry> 229 </row> 230 <row> 231 <entry id="FE-CAN-16VSB"><constant>FE_CAN_16VSB</constant></entry> 232 <entry>The frontend supports 16-VSB modulation</entry> 233 </row> 234 <row> 235 <entry id="FE-HAS-EXTENDED-CAPS"><constant>FE_HAS_EXTENDED_CAPS</constant></entry> 236 <entry>Currently, unused</entry> 237 </row> 238 <row> 239 <entry id="FE-CAN-MULTISTREAM"><constant>FE_CAN_MULTISTREAM</constant></entry> 240 <entry>The frontend supports multistream filtering</entry> 241 </row> 242 <row> 243 <entry id="FE-CAN-TURBO-FEC"><constant>FE_CAN_TURBO_FEC</constant></entry> 244 <entry>The frontend supports turbo FEC modulation</entry> 245 </row> 246 <row> 247 <entry id="FE-CAN-2G-MODULATION"><constant>FE_CAN_2G_MODULATION</constant></entry> 248 <entry>The frontend supports "2nd generation modulation" (DVB-S2/T2)></entry> 249 </row> 250 <row> 251 <entry id="FE-NEEDS-BENDING"><constant>FE_NEEDS_BENDING</constant></entry> 252 <entry>Not supported anymore, don't use it</entry> 253 </row> 254 <row> 255 <entry id="FE-CAN-RECOVER"><constant>FE_CAN_RECOVER</constant></entry> 256 <entry>The frontend can recover from a cable unplug automatically</entry> 257 </row> 258 <row> 259 <entry id="FE-CAN-MUTE-TS"><constant>FE_CAN_MUTE_TS</constant></entry> 260 <entry>The frontend can stop spurious TS data output</entry> 261 </row> 262 </tbody> 263 </tgroup> 264 </table> 265 </refsect1> 266 </refentry>