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This struct is lacking documentation. Add it. Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
206 lines
7.5 KiB
C
206 lines
7.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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/**
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* enum param_type - type of the tuner pameters
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*
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* @TUNER_PARAM_TYPE_RADIO: Tuner params are for FM and/or AM radio
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* @TUNER_PARAM_TYPE_PAL: Tuner params are for PAL color TV standard
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* @TUNER_PARAM_TYPE_SECAM: Tuner params are for SECAM color TV standard
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* @TUNER_PARAM_TYPE_NTSC: Tuner params are for NTSC color TV standard
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* @TUNER_PARAM_TYPE_DIGITAL: Tuner params are for digital TV
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*/
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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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TUNER_PARAM_TYPE_DIGITAL,
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};
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/**
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* struct tuner_range - define the frequencies supported by the tuner
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*
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* @limit: Max frequency supported by that range, in 62.5 kHz
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* (TV) or 62.5 Hz (Radio), as defined by
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* V4L2_TUNER_CAP_LOW.
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* @config: Value of the band switch byte (BB) to setup this mode.
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* @cb: Value of the CB byte to setup this mode.
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*
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* Please notice that digital tuners like xc3028/xc4000/xc5000 don't use
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* those ranges, as they're defined inside the driver. This is used by
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* analog tuners that are compatible with the "Philips way" to setup the
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* tuners. On those devices, the tuner set is done via 4 bytes:
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*
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* #) divider byte1 (DB1)
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* #) divider byte 2 (DB2)
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* #) Control byte (CB)
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* #) band switch byte (BB)
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*
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* Some tuners also have an additional optional Auxiliary byte (AB).
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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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/**
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* struct tuner_params - Parameters to be used to setup the tuner. Those
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* are used by drivers/media/tuners/tuner-types.c in
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* order to specify the tuner properties. Most of
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* the parameters are for tuners based on tda9887 IF-PLL
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* multi-standard analog TV/Radio demodulator, with is
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* very common on legacy analog tuners.
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*
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* @type: Type of the tuner parameters, as defined at
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* enum param_type. If the tuner supports multiple
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* standards, an array should be used, with one
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* row per different standard.
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* @cb_first_if_lower_freq: Many Philips-based tuners have a comment in
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* their datasheet like
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* "For channel selection involving band
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* switching, and to ensure smooth tuning to the
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* desired channel without causing unnecessary
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* charge pump action, it is recommended to
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* consider the difference between wanted channel
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* frequency and the current channel frequency.
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* Unnecessary charge pump action will result
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* in very low tuning voltage which may drive the
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* oscillator to extreme conditions".
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* Set cb_first_if_lower_freq to 1, if this check
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* is required for this tuner. I tested this for
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* PAL by first setting the TV frequency to
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* 203 MHz and then switching to 96.6 MHz FM
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* radio. The result was static unless the
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* control byte was sent first.
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* @has_tda9887: Set to 1 if this tuner uses a tda9887
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* @port1_fm_high_sensitivity: Many Philips tuners use tda9887 PORT1 to select
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* the FM radio sensitivity. If this setting is 1,
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* then set PORT1 to 1 to get proper FM reception.
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* @port2_fm_high_sensitivity: Some Philips tuners use tda9887 PORT2 to select
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* the FM radio sensitivity. If this setting is 1,
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* then set PORT2 to 1 to get proper FM reception.
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* @fm_gain_normal: Some Philips tuners use tda9887 cGainNormal to
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* select the FM radio sensitivity. If this
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* setting is 1, e register will use cGainNormal
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* instead of cGainLow.
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* @intercarrier_mode: Most tuners with a tda9887 use QSS mode.
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* Some (cheaper) tuners use Intercarrier mode.
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* If this setting is 1, then the tuner needs to
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* be set to intercarrier mode.
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* @port1_active: This setting sets the default value for PORT1.
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* 0 means inactive, 1 means active. Note: the
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* actual bit value written to the tda9887 is
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* inverted. So a 0 here means a 1 in the B6 bit.
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* @port2_active: This setting sets the default value for PORT2.
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* 0 means inactive, 1 means active. Note: the
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* actual bit value written to the tda9887 is
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* inverted. So a 0 here means a 1 in the B7 bit.
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* @port1_invert_for_secam_lc: Sometimes PORT1 is inverted when the SECAM-L'
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* standard is selected. Set this bit to 1 if this
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* is needed.
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* @port2_invert_for_secam_lc: Sometimes PORT2 is inverted when the SECAM-L'
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* standard is selected. Set this bit to 1 if this
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* is needed.
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* @port1_set_for_fm_mono: Some cards require PORT1 to be 1 for mono Radio
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* FM and 0 for stereo.
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* @default_pll_gating_18: Select 18% (or according to datasheet 0%)
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* L standard PLL gating, vs the driver default
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* of 36%.
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* @radio_if: IF to use in radio mode. Tuners with a
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* separate radio IF filter seem to use 10.7,
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* while those without use 33.3 for PAL/SECAM
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* tuners and 41.3 for NTSC tuners.
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* 0 = 10.7, 1 = 33.3, 2 = 41.3
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* @default_top_low: Default tda9887 TOP value in dB for the low
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* band. Default is 0. Range: -16:+15
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* @default_top_mid: Default tda9887 TOP value in dB for the mid
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* band. Default is 0. Range: -16:+15
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* @default_top_high: Default tda9887 TOP value in dB for the high
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* band. Default is 0. Range: -16:+15
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* @default_top_secam_low: Default tda9887 TOP value in dB for SECAM-L/L'
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* for the low band. Default is 0. Several tuners
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* require a different TOP value for the
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* SECAM-L/L' standards. Range: -16:+15
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* @default_top_secam_mid: Default tda9887 TOP value in dB for SECAM-L/L'
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* for the mid band. Default is 0. Several tuners
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* require a different TOP value for the
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* SECAM-L/L' standards. Range: -16:+15
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* @default_top_secam_high: Default tda9887 TOP value in dB for SECAM-L/L'
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* for the high band. Default is 0. Several tuners
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* require a different TOP value for the
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* SECAM-L/L' standards. Range: -16:+15
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* @iffreq: Intermediate frequency (IF) used by the tuner
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* on digital mode.
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* @count: Size of the ranges array.
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* @ranges: Array with the frequency ranges supported by
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* the tuner.
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*/
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struct tuner_params {
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enum param_type type;
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unsigned int cb_first_if_lower_freq:1;
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unsigned int has_tda9887:1;
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unsigned int port1_fm_high_sensitivity:1;
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unsigned int port2_fm_high_sensitivity:1;
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unsigned int fm_gain_normal:1;
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unsigned int intercarrier_mode:1;
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unsigned int port1_active:1;
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unsigned int port2_active:1;
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unsigned int port1_invert_for_secam_lc:1;
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unsigned int port2_invert_for_secam_lc:1;
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unsigned int port1_set_for_fm_mono:1;
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unsigned int default_pll_gating_18:1;
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unsigned int radio_if:2;
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signed int default_top_low:5;
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signed int default_top_mid:5;
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signed int default_top_high:5;
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signed int default_top_secam_low:5;
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signed int default_top_secam_mid:5;
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signed int default_top_secam_high:5;
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u16 iffreq;
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unsigned int count;
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struct tuner_range *ranges;
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};
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/**
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* struct tunertype - describes the known tuners.
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*
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* @name: string with the tuner's name.
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* @count: size of &struct tuner_params array.
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* @params: pointer to &struct tuner_params array.
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*
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* @min: minimal tuner frequency, in 62.5 kHz step.
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* should be multiplied to 16 to convert to MHz.
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* @max: minimal tuner frequency, in 62.5 kHz step.
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* Should be multiplied to 16 to convert to MHz.
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* @stepsize: frequency step, in Hz.
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* @initdata: optional byte sequence to initialize the tuner.
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* @sleepdata: optional byte sequence to power down the tuner.
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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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u16 min;
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u16 max;
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u32 stepsize;
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u8 *initdata;
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u8 *sleepdata;
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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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