// SPDX-License-Identifier: GPL-2.0-only
/*
 * RadioTrack II driver
 * Copyright 1998 Ben Pfaff
 *
 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * Converted to the radio-isa framework by Hans Verkuil <hverkuil@kernel.org>
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
 *
 * Fully tested with actual hardware and the v4l2-compliance tool.
 */

#include <linux/module.h>       /* Modules                      */
#include <linux/init.h>         /* Initdata                     */
#include <linux/ioport.h>       /* request_region               */
#include <linux/delay.h>        /* udelay                       */
#include <linux/videodev2.h>    /* kernel radio structs         */
#include <linux/mutex.h>
#include <linux/io.h>           /* outb, outb_p                 */
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include "radio-isa.h"

MODULE_AUTHOR("Ben Pfaff");
MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1.99");

#ifndef CONFIG_RADIO_RTRACK2_PORT
#define CONFIG_RADIO_RTRACK2_PORT -1
#endif

#define RTRACK2_MAX 2

static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
                              [1 ... (RTRACK2_MAX - 1)] = -1 };
static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };

module_param_array(io, int, NULL, 0444);
MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(radio_nr, "Radio device numbers");

static struct radio_isa_card *rtrack2_alloc(void)
{
        return kzalloc_obj(struct radio_isa_card);
}

static void zero(struct radio_isa_card *isa)
{
        outb_p(1, isa->io);
        outb_p(3, isa->io);
        outb_p(1, isa->io);
}

static void one(struct radio_isa_card *isa)
{
        outb_p(5, isa->io);
        outb_p(7, isa->io);
        outb_p(5, isa->io);
}

static int rtrack2_s_frequency(struct radio_isa_card *isa, u32 freq)
{
        int i;

        freq = freq / 200 + 856;

        outb_p(0xc8, isa->io);
        outb_p(0xc9, isa->io);
        outb_p(0xc9, isa->io);

        for (i = 0; i < 10; i++)
                zero(isa);

        for (i = 14; i >= 0; i--)
                if (freq & (1 << i))
                        one(isa);
                else
                        zero(isa);

        outb_p(0xc8, isa->io);
        outb_p(v4l2_ctrl_g_ctrl(isa->mute), isa->io);
        return 0;
}

static u32 rtrack2_g_signal(struct radio_isa_card *isa)
{
        /* bit set = no signal present  */
        return (inb(isa->io) & 2) ? 0 : 0xffff;
}

static int rtrack2_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
{
        outb(mute, isa->io);
        return 0;
}

static const struct radio_isa_ops rtrack2_ops = {
        .alloc = rtrack2_alloc,
        .s_mute_volume = rtrack2_s_mute_volume,
        .s_frequency = rtrack2_s_frequency,
        .g_signal = rtrack2_g_signal,
};

static const int rtrack2_ioports[] = { 0x20f, 0x30f };

static struct radio_isa_driver rtrack2_driver = {
        .driver = {
                .match          = radio_isa_match,
                .probe          = radio_isa_probe,
                .remove         = radio_isa_remove,
                .driver         = {
                        .name   = "radio-rtrack2",
                },
        },
        .io_params = io,
        .radio_nr_params = radio_nr,
        .io_ports = rtrack2_ioports,
        .num_of_io_ports = ARRAY_SIZE(rtrack2_ioports),
        .region_size = 4,
        .card = "AIMSlab RadioTrack II",
        .ops = &rtrack2_ops,
        .has_stereo = true,
};

static int __init rtrack2_init(void)
{
        return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
}

static void __exit rtrack2_exit(void)
{
        isa_unregister_driver(&rtrack2_driver.driver);
}

module_init(rtrack2_init);
module_exit(rtrack2_exit);