// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * isl6405.c - driver for dual lnb supply and control ic ISL6405
 *
 * Copyright (C) 2008 Hartmut Hackmann
 * Copyright (C) 2006 Oliver Endriss
 *
 * 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/string.h>
#include <linux/slab.h>

#include <media/dvb_frontend.h>
#include "isl6405.h"

struct isl6405 {
        u8                      config;
        u8                      override_or;
        u8                      override_and;
        struct i2c_adapter      *i2c;
        u8                      i2c_addr;
};

static int isl6405_set_voltage(struct dvb_frontend *fe,
                               enum fe_sec_voltage voltage)
{
        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
                                .buf = &isl6405->config,
                                .len = sizeof(isl6405->config) };

        if (isl6405->override_or & 0x80) {
                isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
                switch (voltage) {
                case SEC_VOLTAGE_OFF:
                        break;
                case SEC_VOLTAGE_13:
                        isl6405->config |= ISL6405_EN2;
                        break;
                case SEC_VOLTAGE_18:
                        isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
                        break;
                default:
                        return -EINVAL;
                }
        } else {
                isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
                switch (voltage) {
                case SEC_VOLTAGE_OFF:
                        break;
                case SEC_VOLTAGE_13:
                        isl6405->config |= ISL6405_EN1;
                        break;
                case SEC_VOLTAGE_18:
                        isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
                        break;
                default:
                        return -EINVAL;
                }
        }
        isl6405->config |= isl6405->override_or;
        isl6405->config &= isl6405->override_and;

        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
                                .buf = &isl6405->config,
                                .len = sizeof(isl6405->config) };

        if (isl6405->override_or & 0x80) {
                if (arg)
                        isl6405->config |= ISL6405_LLC2;
                else
                        isl6405->config &= ~ISL6405_LLC2;
        } else {
                if (arg)
                        isl6405->config |= ISL6405_LLC1;
                else
                        isl6405->config &= ~ISL6405_LLC1;
        }
        isl6405->config |= isl6405->override_or;
        isl6405->config &= isl6405->override_and;

        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static void isl6405_release(struct dvb_frontend *fe)
{
        /* power off */
        isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);

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

struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
                                    u8 i2c_addr, u8 override_set, u8 override_clear)
{
        struct isl6405 *isl6405 = kmalloc_obj(struct isl6405);
        if (!isl6405)
                return NULL;

        /* default configuration */
        if (override_set & 0x80)
                isl6405->config = ISL6405_ISEL2;
        else
                isl6405->config = ISL6405_ISEL1;
        isl6405->i2c = i2c;
        isl6405->i2c_addr = i2c_addr;
        fe->sec_priv = isl6405;

        /* bits which should be forced to '1' */
        isl6405->override_or = override_set;

        /* bits which should be forced to '0' */
        isl6405->override_and = ~override_clear;

        /* detect if it is present or not */
        if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
                kfree(isl6405);
                fe->sec_priv = NULL;
                return NULL;
        }

        /* install release callback */
        fe->ops.release_sec = isl6405_release;

        /* override frontend ops */
        fe->ops.set_voltage = isl6405_set_voltage;
        fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;

        return fe;
}
EXPORT_SYMBOL_GPL(isl6405_attach);

MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
MODULE_LICENSE("GPL");