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