LXR linux/drivers/media/radio/radio-rtrack2.c

   1/*
   2 * RadioTrack II driver
   3 * Copyright 1998 Ben Pfaff
   4 *
   5 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   6 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
   7 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   8 *
   9 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  10 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  11 *
  12 * Fully tested with actual hardware and the v4l2-compliance tool.
  13 */
  14
  15#include <linux/module.h>       /* Modules                      */
  16#include <linux/init.h>         /* Initdata                     */
  17#include <linux/ioport.h>       /* request_region               */
  18#include <linux/delay.h>        /* udelay                       */
  19#include <linux/videodev2.h>    /* kernel radio structs         */
  20#include <linux/mutex.h>
  21#include <linux/io.h>           /* outb, outb_p                 */
  22#include <linux/slab.h>
  23#include <media/v4l2-device.h>
  24#include <media/v4l2-ioctl.h>
  25#include "radio-isa.h"
  26
  27MODULE_AUTHOR("Ben Pfaff");
  28MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  29MODULE_LICENSE("GPL");
  30MODULE_VERSION("0.1.99");
  31
  32#ifndef CONFIG_RADIO_RTRACK2_PORT
  33#define CONFIG_RADIO_RTRACK2_PORT -1
  34#endif
  35
  36#define RTRACK2_MAX 2
  37
  38static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
  39                              [1 ... (RTRACK2_MAX - 1)] = -1 };
  40static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };
  41
  42module_param_array(io, int, NULL, 0444);
  43MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
  44module_param_array(radio_nr, int, NULL, 0444);
  45MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  46
  47static struct radio_isa_card *rtrack2_alloc(void)
  48{
  49        return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  50}
  51
  52static void zero(struct radio_isa_card *isa)
  53{
  54        outb_p(1, isa->io);
  55        outb_p(3, isa->io);
  56        outb_p(1, isa->io);
  57}
  58
  59static void one(struct radio_isa_card *isa)
  60{
  61        outb_p(5, isa->io);
  62        outb_p(7, isa->io);
  63        outb_p(5, isa->io);
  64}
  65
  66static int rtrack2_s_frequency(struct radio_isa_card *isa, u32 freq)
  67{
  68        int i;
  69
  70        freq = freq / 200 + 856;
  71
  72        outb_p(0xc8, isa->io);
  73        outb_p(0xc9, isa->io);
  74        outb_p(0xc9, isa->io);
  75
  76        for (i = 0; i < 10; i++)
  77                zero(isa);
  78
  79        for (i = 14; i >= 0; i--)
  80                if (freq & (1 << i))
  81                        one(isa);
  82                else
  83                        zero(isa);
  84
  85        outb_p(0xc8, isa->io);
  86        outb_p(v4l2_ctrl_g_ctrl(isa->mute), isa->io);
  87        return 0;
  88}
  89
  90static u32 rtrack2_g_signal(struct radio_isa_card *isa)
  91{
  92        /* bit set = no signal present  */
  93        return (inb(isa->io) & 2) ? 0 : 0xffff;
  94}
  95
  96static int rtrack2_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  97{
  98        outb(mute, isa->io);
  99        return 0;
 100}
 101
 102static const struct radio_isa_ops rtrack2_ops = {
 103        .alloc = rtrack2_alloc,
 104        .s_mute_volume = rtrack2_s_mute_volume,
 105        .s_frequency = rtrack2_s_frequency,
 106        .g_signal = rtrack2_g_signal,
 107};
 108
 109static const int rtrack2_ioports[] = { 0x20f, 0x30f };
 110
 111static struct radio_isa_driver rtrack2_driver = {
 112        .driver = {
 113                .match          = radio_isa_match,
 114                .probe          = radio_isa_probe,
 115                .remove         = radio_isa_remove,
 116                .driver         = {
 117                        .name   = "radio-rtrack2",
 118                },
 119        },
 120        .io_params = io,
 121        .radio_nr_params = radio_nr,
 122        .io_ports = rtrack2_ioports,
 123        .num_of_io_ports = ARRAY_SIZE(rtrack2_ioports),
 124        .region_size = 4,
 125        .card = "AIMSlab RadioTrack II",
 126        .ops = &rtrack2_ops,
 127        .has_stereo = true,
 128};
 129
 130static int __init rtrack2_init(void)
 131{
 132        return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
 133}
 134
 135static void __exit rtrack2_exit(void)
 136{
 137        isa_unregister_driver(&rtrack2_driver.driver);
 138}
 139
 140module_init(rtrack2_init);
 141module_exit(rtrack2_exit);
 142