isl6421.c
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/*
* isl6421.h - driver for lnb supply and control ic ISL6421
*
* Copyright (C) 2006 Andrew de Quincey
* Copyright (C) 2006 Oliver Endriss
*
* 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/string.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "isl6421.h"
struct isl6421 {
u8 config;
u8 override_or;
u8 override_and;
struct i2c_adapter *i2c;
u8 i2c_addr;
};
static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
{
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
.buf = &isl6421->config,
.len = sizeof(isl6421->config) };
isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
switch(voltage) {
case SEC_VOLTAGE_OFF:
break;
case SEC_VOLTAGE_13:
isl6421->config |= ISL6421_EN1;
break;
case SEC_VOLTAGE_18:
isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
break;
default:
return -EINVAL;
}
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}
static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
.buf = &isl6421->config,
.len = sizeof(isl6421->config) };
if (arg)
isl6421->config |= ISL6421_LLC1;
else
isl6421->config &= ~ISL6421_LLC1;
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}
static int isl6421_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
.buf = &isl6421->config,
.len = sizeof(isl6421->config) };
switch (tone) {
case SEC_TONE_ON:
isl6421->config |= ISL6421_ENT1;
break;
case SEC_TONE_OFF:
isl6421->config &= ~ISL6421_ENT1;
break;
default:
return -EINVAL;
}
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}
static void isl6421_release(struct dvb_frontend *fe)
{
/* power off */
isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
/* free */
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
u8 override_set, u8 override_clear, bool override_tone)
{
struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
if (!isl6421)
return NULL;
/* default configuration */
isl6421->config = ISL6421_ISEL1;
isl6421->i2c = i2c;
isl6421->i2c_addr = i2c_addr;
fe->sec_priv = isl6421;
/* bits which should be forced to '1' */
isl6421->override_or = override_set;
/* bits which should be forced to '0' */
isl6421->override_and = ~override_clear;
/* detect if it is present or not */
if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
kfree(isl6421);
fe->sec_priv = NULL;
return NULL;
}
/* install release callback */
fe->ops.release_sec = isl6421_release;
/* override frontend ops */
fe->ops.set_voltage = isl6421_set_voltage;
fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
if (override_tone)
fe->ops.set_tone = isl6421_set_tone;
return fe;
}
EXPORT_SYMBOL(isl6421_attach);
MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
MODULE_LICENSE("GPL");