radio-rtrack2.c

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/*
 * RadioTrack II driver
 * Copyright 1998 Ben Pfaff
 *
 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
 * Converted to new API by Alan Cox <[email protected]>
 * Various bugfixes and enhancements by Russell Kroll <[email protected]>
 *
 * Converted to the radio-isa framework by Hans Verkuil <[email protected]>
 * Converted to V4L2 API by Mauro Carvalho Chehab <[email protected]>
 */

#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(sizeof(struct radio_isa_card), GFP_KERNEL);
}

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);
    if (!v4l2_ctrl_g_ctrl(isa->mute))
        outb_p(0, 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);