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
  27 MODULE_AUTHOR("Ben Pfaff");
  28 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  29 MODULE_LICENSE("GPL");
  30 MODULE_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
  38 static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
  39                               [1 ... (RTRACK2_MAX - 1)] = -1 };
  40 static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };
  41
  42 module_param_array(io, int, NULL, 0444);
  43 MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
  44 module_param_array(radio_nr, int, NULL, 0444);
  45 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  46
  47 static struct radio_isa_card *rtrack2_alloc(void)
  48 {
  49         return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  50 }
  51
  52 static 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
  59 static 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
  66 static 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
  90 static 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
  96 static 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
 102 static 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
 109 static const int rtrack2_ioports[] = { 0x20f, 0x30f };
 110
 111 static 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
 130 static int __init rtrack2_init(void)
 131 {
 132         return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
 133 }
 134
 135 static void __exit rtrack2_exit(void)
 136 {
 137         isa_unregister_driver(&rtrack2_driver.driver);
 138 }
 139
 140 module_init(rtrack2_init);
 141 module_exit(rtrack2_exit);