drivers/media/radio/radio-rtrack2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * RadioTrack II driver
   4  * Copyright 1998 Ben Pfaff
   5  *
   6  * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   7  * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
   8  * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   9  *
  10  * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  11  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
  12  *
  13  * Fully tested with actual hardware and the v4l2-compliance tool.
  14  */
  15
  16 #include <linux/module.h>       /* Modules                      */
  17 #include <linux/init.h>         /* Initdata                     */
  18 #include <linux/ioport.h>       /* request_region               */
  19 #include <linux/delay.h>        /* udelay                       */
  20 #include <linux/videodev2.h>    /* kernel radio structs         */
  21 #include <linux/mutex.h>
  22 #include <linux/io.h>           /* outb, outb_p                 */
  23 #include <linux/slab.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-ioctl.h>
  26 #include "radio-isa.h"
  27
  28 MODULE_AUTHOR("Ben Pfaff");
  29 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  30 MODULE_LICENSE("GPL");
  31 MODULE_VERSION("0.1.99");
  32
  33 #ifndef CONFIG_RADIO_RTRACK2_PORT
  34 #define CONFIG_RADIO_RTRACK2_PORT -1
  35 #endif
  36
  37 #define RTRACK2_MAX 2
  38
  39 static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
  40                               [1 ... (RTRACK2_MAX - 1)] = -1 };
  41 static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };
  42
  43 module_param_array(io, int, NULL, 0444);
  44 MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
  45 module_param_array(radio_nr, int, NULL, 0444);
  46 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  47
  48 static struct radio_isa_card *rtrack2_alloc(void)
  49 {
  50         return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  51 }
  52
  53 static void zero(struct radio_isa_card *isa)
  54 {
  55         outb_p(1, isa->io);
  56         outb_p(3, isa->io);
  57         outb_p(1, isa->io);
  58 }
  59
  60 static void one(struct radio_isa_card *isa)
  61 {
  62         outb_p(5, isa->io);
  63         outb_p(7, isa->io);
  64         outb_p(5, isa->io);
  65 }
  66
  67 static int rtrack2_s_frequency(struct radio_isa_card *isa, u32 freq)
  68 {
  69         int i;
  70
  71         freq = freq / 200 + 856;
  72
  73         outb_p(0xc8, isa->io);
  74         outb_p(0xc9, isa->io);
  75         outb_p(0xc9, isa->io);
  76
  77         for (i = 0; i < 10; i++)
  78                 zero(isa);
  79
  80         for (i = 14; i >= 0; i--)
  81                 if (freq & (1 << i))
  82                         one(isa);
  83                 else
  84                         zero(isa);
  85
  86         outb_p(0xc8, isa->io);
  87         outb_p(v4l2_ctrl_g_ctrl(isa->mute), isa->io);
  88         return 0;
  89 }
  90
  91 static u32 rtrack2_g_signal(struct radio_isa_card *isa)
  92 {
  93         /* bit set = no signal present  */
  94         return (inb(isa->io) & 2) ? 0 : 0xffff;
  95 }
  96
  97 static int rtrack2_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  98 {
  99         outb(mute, isa->io);
 100         return 0;
 101 }
 102
 103 static const struct radio_isa_ops rtrack2_ops = {
 104         .alloc = rtrack2_alloc,
 105         .s_mute_volume = rtrack2_s_mute_volume,
 106         .s_frequency = rtrack2_s_frequency,
 107         .g_signal = rtrack2_g_signal,
 108 };
 109
 110 static const int rtrack2_ioports[] = { 0x20f, 0x30f };
 111
 112 static struct radio_isa_driver rtrack2_driver = {
 113         .driver = {
 114                 .match          = radio_isa_match,
 115                 .probe          = radio_isa_probe,
 116                 .remove         = radio_isa_remove,
 117                 .driver         = {
 118                         .name   = "radio-rtrack2",
 119                 },
 120         },
 121         .io_params = io,
 122         .radio_nr_params = radio_nr,
 123         .io_ports = rtrack2_ioports,
 124         .num_of_io_ports = ARRAY_SIZE(rtrack2_ioports),
 125         .region_size = 4,
 126         .card = "AIMSlab RadioTrack II",
 127         .ops = &rtrack2_ops,
 128         .has_stereo = true,
 129 };
 130
 131 static int __init rtrack2_init(void)
 132 {
 133         return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
 134 }
 135
 136 static void __exit rtrack2_exit(void)
 137 {
 138         isa_unregister_driver(&rtrack2_driver.driver);
 139 }
 140
 141 module_init(rtrack2_init);
 142 module_exit(rtrack2_exit);