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");