diff options
Diffstat (limited to 'include/media/tuner-types.h')
-rw-r--r-- | include/media/tuner-types.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/media/tuner-types.h b/include/media/tuner-types.h new file mode 100644 index 000000000000..15821ab14a9e --- /dev/null +++ b/include/media/tuner-types.h @@ -0,0 +1,55 @@ +/* + * descriptions for simple tuners. + */ + +#ifndef __TUNER_TYPES_H__ +#define __TUNER_TYPES_H__ + +enum param_type { + TUNER_PARAM_TYPE_RADIO, \ + TUNER_PARAM_TYPE_PAL, \ + TUNER_PARAM_TYPE_SECAM, \ + TUNER_PARAM_TYPE_NTSC +}; + +struct tuner_range { + unsigned short limit; + unsigned char cb; +}; + +struct tuner_params { + enum param_type type; + /* Many Philips based tuners have a comment like this in their + * datasheet: + * + * For channel selection involving band switching, and to ensure + * smooth tuning to the desired channel without causing + * unnecessary charge pump action, it is recommended to consider + * the difference between wanted channel frequency and the + * current channel frequency. Unnecessary charge pump action + * will result in very low tuning voltage which may drive the + * oscillator to extreme conditions. + * + * Set cb_first_if_lower_freq to 1, if this check is + * required for this tuner. + * + * I tested this for PAL by first setting the TV frequency to + * 203 MHz and then switching to 96.6 MHz FM radio. The result was + * static unless the control byte was sent first. + */ + unsigned int cb_first_if_lower_freq:1; + unsigned char config; /* to be moved into struct tuner_range for dvb-pll merge */ + + unsigned int count; + struct tuner_range *ranges; +}; + +struct tunertype { + char *name; + struct tuner_params *params; +}; + +extern struct tunertype tuners[]; +extern unsigned const int tuner_count; + +#endif |