// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lnbp22 . h - driver for lnb supply and control ic lnbp22
*
* Copyright ( C ) 2006 Dominik Kuhlen
* Based on lnbp21 driver
*
* the project ' s page is at https : //linuxtv.org
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "lnbp22.h"
static int debug;
module_param(debug, int , 0644 );
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)." );
#define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
struct lnbp22 {
u8 config[4 ];
struct i2c_adapter *i2c;
};
static int lnbp22_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage voltage)
{
struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
struct i2c_msg msg = {
.addr = 0 x08,
.flags = 0 ,
.buf = (char *)&lnbp22->config,
.len = sizeof (lnbp22->config),
};
dprintk(1 , "%s: %d (18V=%d 13V=%d)\n" , __func__, voltage,
SEC_VOLTAGE_18, SEC_VOLTAGE_13);
lnbp22->config[3 ] = 0 x60; /* Power down */
switch (voltage) {
case SEC_VOLTAGE_OFF:
break ;
case SEC_VOLTAGE_13:
lnbp22->config[3 ] |= LNBP22_EN;
break ;
case SEC_VOLTAGE_18:
lnbp22->config[3 ] |= (LNBP22_EN | LNBP22_VSEL);
break ;
default :
return -EINVAL;
}
dprintk(1 , "%s: 0x%02x)\n" , __func__, lnbp22->config[3 ]);
return (i2c_transfer(lnbp22->i2c, &msg, 1 ) == 1 ) ? 0 : -EIO;
}
static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
struct i2c_msg msg = {
.addr = 0 x08,
.flags = 0 ,
.buf = (char *)&lnbp22->config,
.len = sizeof (lnbp22->config),
};
dprintk(1 , "%s: %d\n" , __func__, (int )arg);
if (arg)
lnbp22->config[3 ] |= LNBP22_LLC;
else
lnbp22->config[3 ] &= ~LNBP22_LLC;
return (i2c_transfer(lnbp22->i2c, &msg, 1 ) == 1 ) ? 0 : -EIO;
}
static void lnbp22_release(struct dvb_frontend *fe)
{
dprintk(1 , "%s\n" , __func__);
/* LNBP power off */
lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
/* free data */
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c)
{
struct lnbp22 *lnbp22 = kmalloc(sizeof (struct lnbp22), GFP_KERNEL);
if (!lnbp22)
return NULL;
/* default configuration */
lnbp22->config[0 ] = 0 x00; /* ? */
lnbp22->config[1 ] = 0 x28; /* ? */
lnbp22->config[2 ] = 0 x48; /* ? */
lnbp22->config[3 ] = 0 x60; /* Power down */
lnbp22->i2c = i2c;
fe->sec_priv = lnbp22;
/* detect if it is present or not */
if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
dprintk(0 , "%s LNBP22 not found\n" , __func__);
kfree(lnbp22);
fe->sec_priv = NULL;
return NULL;
}
/* install release callback */
fe->ops.release_sec = lnbp22_release;
/* override frontend ops */
fe->ops.set_voltage = lnbp22_set_voltage;
fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
return fe;
}
EXPORT_SYMBOL_GPL(lnbp22_attach);
MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22" );
MODULE_AUTHOR("Dominik Kuhlen" );
MODULE_LICENSE("GPL" );
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(vorverarbeitet am 2026-09-29)
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