// 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 = 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_obj(struct lnbp22);
        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_GPL(lnbp22_attach);

MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
MODULE_AUTHOR("Dominik Kuhlen");
MODULE_LICENSE("GPL");