lnbp21.c

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/*
 * lnbp21.c - driver for lnb supply and control ic lnbp21
 *
 * Copyright (C) 2006, 2009 Oliver Endriss <[email protected]>
 * Copyright (C) 2009 Igor M. Liplianin <[email protected]>
 *
 * 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 "lnbp21.h"
#include "lnbh24.h"

struct lnbp21 {
    u8          config;
    u8          override_or;
    u8          override_and;
    struct i2c_adapter  *i2c;
    u8          i2c_addr;
};

static int lnbp21_set_voltage(struct dvb_frontend *fe,
                    fe_sec_voltage_t voltage)
{
    struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
    struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
                .buf = &lnbp21->config,
                .len = sizeof(lnbp21->config) };

    lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);

    switch(voltage) {
    case SEC_VOLTAGE_OFF:
        break;
    case SEC_VOLTAGE_13:
        lnbp21->config |= LNBP21_EN;
        break;
    case SEC_VOLTAGE_18:
        lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
        break;
    default:
        return -EINVAL;
    }

    lnbp21->config |= lnbp21->override_or;
    lnbp21->config &= lnbp21->override_and;

    return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
    struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
    struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
                .buf = &lnbp21->config,
                .len = sizeof(lnbp21->config) };

    if (arg)
        lnbp21->config |= LNBP21_LLC;
    else
        lnbp21->config &= ~LNBP21_LLC;

    lnbp21->config |= lnbp21->override_or;
    lnbp21->config &= lnbp21->override_and;

    return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int lnbp21_set_tone(struct dvb_frontend *fe,
                fe_sec_tone_mode_t tone)
{
    struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
    struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
                .buf = &lnbp21->config,
                .len = sizeof(lnbp21->config) };

    switch (tone) {
    case SEC_TONE_OFF:
        lnbp21->config &= ~LNBP21_TEN;
        break;
    case SEC_TONE_ON:
        lnbp21->config |= LNBP21_TEN;
        break;
    default:
        return -EINVAL;
    }

    lnbp21->config |= lnbp21->override_or;
    lnbp21->config &= lnbp21->override_and;

    return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static void lnbp21_release(struct dvb_frontend *fe)
{
    /* LNBP power off */
    lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);

    /* free data */
    kfree(fe->sec_priv);
    fe->sec_priv = NULL;
}

static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
                struct i2c_adapter *i2c, u8 override_set,
                u8 override_clear, u8 i2c_addr, u8 config)
{
    struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
    if (!lnbp21)
        return NULL;

    /* default configuration */
    lnbp21->config = config;
    lnbp21->i2c = i2c;
    lnbp21->i2c_addr = i2c_addr;
    fe->sec_priv = lnbp21;

    /* bits which should be forced to '1' */
    lnbp21->override_or = override_set;

    /* bits which should be forced to '0' */
    lnbp21->override_and = ~override_clear;

    /* detect if it is present or not */
    if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
        kfree(lnbp21);
        return NULL;
    }

    /* install release callback */
    fe->ops.release_sec = lnbp21_release;

    /* override frontend ops */
    fe->ops.set_voltage = lnbp21_set_voltage;
    fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
    if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
        fe->ops.set_tone = lnbp21_set_tone;
    printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);

    return fe;
}

struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
                struct i2c_adapter *i2c, u8 override_set,
                u8 override_clear, u8 i2c_addr)
{
    return lnbx2x_attach(fe, i2c, override_set, override_clear,
                            i2c_addr, LNBH24_TTX);
}
EXPORT_SYMBOL(lnbh24_attach);

struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
                struct i2c_adapter *i2c, u8 override_set,
                u8 override_clear)
{
    return lnbx2x_attach(fe, i2c, override_set, override_clear,
                            0x08, LNBP21_ISEL);
}
EXPORT_SYMBOL(lnbp21_attach);

MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
MODULE_LICENSE("GPL");