linux/drivers/media/dvb/frontends/dvb-pll.h
Trent Piepho 26aed92289 V4L/DVB (5362): Dvb-pll: add code for doing tuner initialization
Some tuners need or benefit from initialization, to change certain
settings from their power on default values.

Typically, tuners with TUA603x PLLs can benefit from setting the AGC TOP
value to something else.  This patch includes code to set the AGC TOP to
103 dBuV for the Thomson DTT-761x tuners, which I have experimentally
verified gives the best SNR readings, increasing SNR by about 0.19 dB
over the default value.

Other tuners can make use of this as well.  For example, the separate LG
TDVS-H06xF driver's only difference from dvb-pll is this same setting of
AGC TOP value.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2007-04-27 15:44:04 -03:00

80 lines
2.2 KiB
C

/*
* descriptions + helper functions for simple dvb plls.
*/
#ifndef __DVB_PLL_H__
#define __DVB_PLL_H__
#include <linux/i2c.h>
#include "dvb_frontend.h"
struct dvb_pll_desc {
char *name;
u32 min;
u32 max;
void (*setbw)(u8 *buf, u32 freq, int bandwidth);
u8 *initdata;
int count;
struct {
u32 limit;
u32 offset;
u32 stepsize;
u8 config;
u8 cb;
} entries[12];
};
extern struct dvb_pll_desc dvb_pll_thomson_dtt7579;
extern struct dvb_pll_desc dvb_pll_thomson_dtt759x;
extern struct dvb_pll_desc dvb_pll_thomson_dtt7610;
extern struct dvb_pll_desc dvb_pll_lg_z201;
extern struct dvb_pll_desc dvb_pll_microtune_4042;
extern struct dvb_pll_desc dvb_pll_thomson_dtt761x;
extern struct dvb_pll_desc dvb_pll_unknown_1;
extern struct dvb_pll_desc dvb_pll_tua6010xs;
extern struct dvb_pll_desc dvb_pll_env57h1xd5;
extern struct dvb_pll_desc dvb_pll_tua6034;
extern struct dvb_pll_desc dvb_pll_lg_tdvs_h06xf;
extern struct dvb_pll_desc dvb_pll_tda665x;
extern struct dvb_pll_desc dvb_pll_fmd1216me;
extern struct dvb_pll_desc dvb_pll_tded4;
extern struct dvb_pll_desc dvb_pll_tuv1236d;
extern struct dvb_pll_desc dvb_pll_tdhu2;
extern struct dvb_pll_desc dvb_pll_samsung_tbmv;
extern struct dvb_pll_desc dvb_pll_philips_sd1878_tda8261;
extern struct dvb_pll_desc dvb_pll_philips_td1316;
extern struct dvb_pll_desc dvb_pll_thomson_fe6600;
extern int dvb_pll_configure(struct dvb_pll_desc *desc, u8 *buf,
u32 freq, int bandwidth);
/**
* Attach a dvb-pll to the supplied frontend structure.
*
* @param fe Frontend to attach to.
* @param pll_addr i2c address of the PLL (if used).
* @param i2c i2c adapter to use (set to NULL if not used).
* @param desc dvb_pll_desc to use.
* @return Frontend pointer on success, NULL on failure
*/
#if defined(CONFIG_DVB_PLL) || (defined(CONFIG_DVB_PLL_MODULE) && defined(MODULE))
extern struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe,
int pll_addr,
struct i2c_adapter *i2c,
struct dvb_pll_desc *desc);
#else
static inline struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe,
int pll_addr,
struct i2c_adapter *i2c,
struct dvb_pll_desc *desc)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __FUNCTION__);
return NULL;
}
#endif
#endif