lnbp22.c
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/*
* lnbp22.h - driver for lnb supply and control ic lnbp22
*
* Copyright (C) 2006 Dominik Kuhlen
* Based on lnbp21 driver
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*
*
* the project's page is at http://www.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 "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, fe_sec_voltage_t voltage)
{
struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
struct i2c_msg msg = {
.addr = 0x08,
.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] = 0x60; /* 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 = 0x08,
.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] = 0x00; /* ? */
lnbp22->config[1] = 0x28; /* ? */
lnbp22->config[2] = 0x48; /* ? */
lnbp22->config[3] = 0x60; /* 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(lnbp22_attach);
MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
MODULE_AUTHOR("Dominik Kuhlen");
MODULE_LICENSE("GPL");