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