112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/*
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* descriptions for simple tuners.
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*/
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#ifndef __TUNER_TYPES_H__
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#define __TUNER_TYPES_H__
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enum param_type {
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TUNER_PARAM_TYPE_RADIO, \
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TUNER_PARAM_TYPE_PAL, \
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TUNER_PARAM_TYPE_SECAM, \
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TUNER_PARAM_TYPE_NTSC
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};
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struct tuner_range {
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unsigned short limit;
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unsigned char config;
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unsigned char cb;
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};
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struct tuner_params {
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enum param_type type;
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/* Many Philips based tuners have a comment like this in their
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* datasheet:
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*
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* For channel selection involving band switching, and to ensure
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* smooth tuning to the desired channel without causing
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* unnecessary charge pump action, it is recommended to consider
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* the difference between wanted channel frequency and the
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* current channel frequency. Unnecessary charge pump action
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* will result in very low tuning voltage which may drive the
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* oscillator to extreme conditions.
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*
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* Set cb_first_if_lower_freq to 1, if this check is
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* required for this tuner.
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*
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* I tested this for PAL by first setting the TV frequency to
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* 203 MHz and then switching to 96.6 MHz FM radio. The result was
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* static unless the control byte was sent first.
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*/
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unsigned int cb_first_if_lower_freq:1;
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/* Set to 1 if this tuner uses a tda9887 */
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unsigned int has_tda9887:1;
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/* Many Philips tuners use tda9887 PORT1 to select the FM radio
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sensitivity. If this setting is 1, then set PORT1 to 1 to
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get proper FM reception. */
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unsigned int port1_fm_high_sensitivity:1;
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/* Some Philips tuners use tda9887 PORT2 to select the FM radio
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sensitivity. If this setting is 1, then set PORT2 to 1 to
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get proper FM reception. */
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unsigned int port2_fm_high_sensitivity:1;
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/* Most tuners with a tda9887 use QSS mode. Some (cheaper) tuners
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use Intercarrier mode. If this setting is 1, then the tuner
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needs to be set to intercarrier mode. */
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unsigned int intercarrier_mode:1;
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/* This setting sets the default value for PORT1.
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0 means inactive, 1 means active. Note: the actual bit
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value written to the tda9887 is inverted. So a 0 here
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means a 1 in the B6 bit. */
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unsigned int port1_active:1;
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/* This setting sets the default value for PORT2.
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0 means inactive, 1 means active. Note: the actual bit
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value written to the tda9887 is inverted. So a 0 here
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means a 1 in the B7 bit. */
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unsigned int port2_active:1;
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/* Sometimes PORT1 is inverted when the SECAM-L' standard is selected.
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Set this bit to 1 if this is needed. */
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unsigned int port1_invert_for_secam_lc:1;
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/* Sometimes PORT2 is inverted when the SECAM-L' standard is selected.
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Set this bit to 1 if this is needed. */
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unsigned int port2_invert_for_secam_lc:1;
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/* Some cards require PORT1 to be 1 for mono Radio FM and 0 for stereo. */
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unsigned int port1_set_for_fm_mono:1;
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/* Default tda9887 TOP value in dB for the low band. Default is 0.
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Range: -16:+15 */
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signed int default_top_low:5;
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/* Default tda9887 TOP value in dB for the mid band. Default is 0.
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Range: -16:+15 */
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signed int default_top_mid:5;
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/* Default tda9887 TOP value in dB for the high band. Default is 0.
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Range: -16:+15 */
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signed int default_top_high:5;
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/* Default tda9887 TOP value in dB for SECAM-L/L' for the low band.
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Default is 0. Several tuners require a different TOP value for
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the SECAM-L/L' standards. Range: -16:+15 */
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signed int default_top_secam_low:5;
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/* Default tda9887 TOP value in dB for SECAM-L/L' for the mid band.
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Default is 0. Several tuners require a different TOP value for
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the SECAM-L/L' standards. Range: -16:+15 */
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signed int default_top_secam_mid:5;
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/* Default tda9887 TOP value in dB for SECAM-L/L' for the high band.
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Default is 0. Several tuners require a different TOP value for
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the SECAM-L/L' standards. Range: -16:+15 */
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signed int default_top_secam_high:5;
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unsigned int count;
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struct tuner_range *ranges;
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};
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struct tunertype {
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char *name;
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unsigned int count;
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struct tuner_params *params;
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};
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extern struct tunertype tuners[];
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extern unsigned const int tuner_count;
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#endif
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