1. 根目录:
2. include
3. media
4. tuner-types.h

/*
 * descriptions for simple tuners.
 */

#ifndef __TUNER_TYPES_H__
#define __TUNER_TYPES_H__

/**
 * enum param_type - type of the tuner pameters
 *
 * @TUNER_PARAM_TYPE_RADIO:	Tuner params are for FM and/or AM radio
 * @TUNER_PARAM_TYPE_PAL:	Tuner params are for PAL color TV standard
 * @TUNER_PARAM_TYPE_SECAM:	Tuner params are for SECAM color TV standard
 * @TUNER_PARAM_TYPE_NTSC:	Tuner params are for NTSC color TV standard
 * @TUNER_PARAM_TYPE_DIGITAL:	Tuner params are for digital TV
 */
enum param_type {
	TUNER_PARAM_TYPE_RADIO,
	TUNER_PARAM_TYPE_PAL,
	TUNER_PARAM_TYPE_SECAM,
	TUNER_PARAM_TYPE_NTSC,
	TUNER_PARAM_TYPE_DIGITAL,
};

/**
 * struct tuner_range - define the frequencies supported by the tuner
 *
 * @limit:		Max frequency supported by that range, in 62.5 kHz
 *			(TV) or 62.5 Hz (Radio), as defined by
 *			V4L2_TUNER_CAP_LOW.
 * @config:		Value of the band switch byte (BB) to setup this mode.
 * @cb:			Value of the CB byte to setup this mode.
 *
 * Please notice that digital tuners like xc3028/xc4000/xc5000 don't use
 * those ranges, as they're defined inside the driver. This is used by
 * analog tuners that are compatible with the "Philips way" to setup the
 * tuners. On those devices, the tuner set is done via 4 bytes:
 *	divider byte1 (DB1), divider byte 2 (DB2), Control byte (CB) and
 *	band switch byte (BB).
 * Some tuners also have an additional optional Auxiliary byte (AB).
 */
struct tuner_range {
	unsigned short limit;
	unsigned char config;
	unsigned char cb;
};

/**
 * struct tuner_params - 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.
 *
 * @type:			Type of the tuner parameters, as defined at
 *				enum param_type. If the tuner supports multiple
 *				standards, an array should be used, with one
 *				row per different standard.
 * @cb_first_if_lower_freq:	Many Philips-based tuners have a comment in
 *				their datasheet like
 *				"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.
 * @has_tda9887:		Set to 1 if this tuner uses a tda9887
 * @port1_fm_high_sensitivity:	Many Philips tuners use tda9887 PORT1 to select
 *				the FM radio sensitivity. If this setting is 1,
 *				then set PORT1 to 1 to get proper FM reception.
 * @port2_fm_high_sensitivity:	Some Philips tuners use tda9887 PORT2 to select
 *				the FM radio sensitivity. If this setting is 1,
 *				then set PORT2 to 1 to get proper FM reception.
 * @fm_gain_normal:		Some Philips tuners use tda9887 cGainNormal to
 *				select the FM radio sensitivity. If this
 *				setting is 1, e register will use cGainNormal
 *				instead of cGainLow.
 * @intercarrier_mode:		Most tuners with a tda9887 use QSS mode.
 *				Some (cheaper) tuners use Intercarrier mode.
 *				If this setting is 1, then the tuner needs to
 *				be set to intercarrier mode.
 * @port1_active:		This setting sets the default value for PORT1.
 *				0 means inactive, 1 means active. Note: the
 *				actual bit value written to the tda9887 is
 *				inverted. So a 0 here means a 1 in the B6 bit.
 * @port2_active:		This setting sets the default value for PORT2.
 *				0 means inactive, 1 means active. Note: the
 *				actual bit value written to the tda9887 is
 *				inverted. So a 0 here means a 1 in the B7 bit.
 * @port1_invert_for_secam_lc:	Sometimes PORT1 is inverted when the SECAM-L'
 *				standard is selected. Set this bit to 1 if this
 *				is needed.
 * @port2_invert_for_secam_lc:	Sometimes PORT2 is inverted when the SECAM-L'
 *				standard is selected. Set this bit to 1 if this
 *				is needed.
 * @port1_set_for_fm_mono:	Some cards require PORT1 to be 1 for mono Radio
 *				FM and 0 for stereo.
 * @default_pll_gating_18:	Select 18% (or according to datasheet 0%)
 *				L standard PLL gating, vs the driver default
 *				of 36%.
 * @radio_if:			IF to use in radio mode.  Tuners with a
 *				separate radio IF filter seem to use 10.7,
 *				while those without use 33.3 for PAL/SECAM
 *				tuners and 41.3 for NTSC tuners.
 *				0 = 10.7, 1 = 33.3, 2 = 41.3
 * @default_top_low:		Default tda9887 TOP value in dB for the low
 *				band. Default is 0. Range: -16:+15
 * @default_top_mid:		Default tda9887 TOP value in dB for the mid
 *				band. Default is 0. Range: -16:+15
 * @default_top_high:		Default tda9887 TOP value in dB for the high
 *				band. Default is 0. Range: -16:+15
 * @default_top_secam_low:	Default tda9887 TOP value in dB for SECAM-L/L'
 *				for the low band. Default is 0. Several tuners
 *				require a different TOP value for the
 *				SECAM-L/L' standards. Range: -16:+15
 * @default_top_secam_mid:	Default tda9887 TOP value in dB for SECAM-L/L'
 *				for the mid band. Default is 0. Several tuners
 *				require a different TOP value for the
 *				SECAM-L/L' standards. Range: -16:+15
 * @default_top_secam_high:	Default tda9887 TOP value in dB for SECAM-L/L'
 *				for the high band. Default is 0. Several tuners
 *				require a different TOP value for the
 *				SECAM-L/L' standards. Range: -16:+15
 * @iffreq:			Intermediate frequency (IF) used by the tuner
 *				on digital mode.
 * @count:			Size of the ranges array.
 * @ranges:			Array with the frequency ranges supported by
 *				the tuner.
 */
struct tuner_params {
	enum param_type type;

	unsigned int cb_first_if_lower_freq:1;
	unsigned int has_tda9887:1;
	unsigned int port1_fm_high_sensitivity:1;
	unsigned int port2_fm_high_sensitivity:1;
	unsigned int fm_gain_normal:1;
	unsigned int intercarrier_mode:1;
	unsigned int port1_active:1;
	unsigned int port2_active:1;
	unsigned int port1_invert_for_secam_lc:1;
	unsigned int port2_invert_for_secam_lc:1;
	unsigned int port1_set_for_fm_mono:1;
	unsigned int default_pll_gating_18:1;
	unsigned int radio_if:2;
	signed int default_top_low:5;
	signed int default_top_mid:5;
	signed int default_top_high:5;
	signed int default_top_secam_low:5;
	signed int default_top_secam_mid:5;
	signed int default_top_secam_high:5;

	u16 iffreq;

	unsigned int count;
	struct tuner_range *ranges;
};

struct tunertype {
	char *name;
	unsigned int count;
	struct tuner_params *params;

	u16 min;
	u16 max;
	u32 stepsize;

	u8 *initdata;
	u8 *sleepdata;
};

extern struct tunertype tuners[];
extern unsigned const int tuner_count;

#endif