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

   1/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
   2 * (c) 1999 R. Offermanns (rolf@offermanns.de)
   3 * based on the aimslab radio driver from M. Kirkwood
   4 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
   5 *
   6 *
   7 * History:
   8 * 1999-05-21   First preview release
   9 *
  10 *  Notes on the hardware:
  11 *  There are two "main" chips on the card:
  12 *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
  13 *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
  14 *  (you can get the datasheet at the above links)
  15 *
  16 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  17 *  Volume Control is done digitally
  18 *
  19 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  20 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  21 */
  22
  23#include <linux/module.h>       /* Modules                      */
  24#include <linux/init.h>         /* Initdata                     */
  25#include <linux/ioport.h>       /* request_region               */
  26#include <linux/videodev2.h>    /* kernel radio structs         */
  27#include <linux/mutex.h>
  28#include <linux/io.h>           /* outb, outb_p                 */
  29#include <linux/slab.h>
  30#include <media/v4l2-device.h>
  31#include <media/v4l2-ioctl.h>
  32#include "radio-isa.h"
  33
  34MODULE_AUTHOR("R. Offermans & others");
  35MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
  36MODULE_LICENSE("GPL");
  37MODULE_VERSION("0.1.99");
  38
  39/* Note: there seems to be only one possible port (0x590), but without
  40   hardware this is hard to verify. For now, this is the only one we will
  41   support. */
  42static int io = 0x590;
  43static int radio_nr = -1;
  44
  45module_param(radio_nr, int, 0444);
  46MODULE_PARM_DESC(radio_nr, "Radio device number");
  47
  48#define WRT_DIS         0x00
  49#define CLK_OFF         0x00
  50#define IIC_DATA        0x01
  51#define IIC_CLK         0x02
  52#define DATA            0x04
  53#define CLK_ON          0x08
  54#define WRT_EN          0x10
  55
  56static struct radio_isa_card *terratec_alloc(void)
  57{
  58        return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  59}
  60
  61static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  62{
  63        int i;
  64
  65        if (mute)
  66                vol = 0;
  67        vol = vol + (vol * 32); /* change both channels */
  68        for (i = 0; i < 8; i++) {
  69                if (vol & (0x80 >> i))
  70                        outb(0x80, isa->io + 1);
  71                else
  72                        outb(0x00, isa->io + 1);
  73        }
  74        return 0;
  75}
  76
  77
  78/* this is the worst part in this driver */
  79/* many more or less strange things are going on here, but hey, it works :) */
  80
  81static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
  82{
  83        int i;
  84        int p;
  85        int temp;
  86        long rest;
  87        unsigned char buffer[25];               /* we have to bit shift 25 registers */
  88
  89        freq = freq / 160;                      /* convert the freq. to a nice to handle value */
  90        memset(buffer, 0, sizeof(buffer));
  91
  92        rest = freq * 10 + 10700;       /* I once had understood what is going on here */
  93                                        /* maybe some wise guy (friedhelm?) can comment this stuff */
  94        i = 13;
  95        p = 10;
  96        temp = 102400;
  97        while (rest != 0) {
  98                if (rest % temp  == rest)
  99                        buffer[i] = 0;
 100                else {
 101                        buffer[i] = 1;
 102                        rest = rest - temp;
 103                }
 104                i--;
 105                p--;
 106                temp = temp / 2;
 107        }
 108
 109        for (i = 24; i > -1; i--) {     /* bit shift the values to the radiocard */
 110                if (buffer[i] == 1) {
 111                        outb(WRT_EN | DATA, isa->io);
 112                        outb(WRT_EN | DATA | CLK_ON, isa->io);
 113                        outb(WRT_EN | DATA, isa->io);
 114                } else {
 115                        outb(WRT_EN | 0x00, isa->io);
 116                        outb(WRT_EN | 0x00 | CLK_ON, isa->io);
 117                }
 118        }
 119        outb(0x00, isa->io);
 120        return 0;
 121}
 122
 123static u32 terratec_g_signal(struct radio_isa_card *isa)
 124{
 125        /* bit set = no signal present  */
 126        return (inb(isa->io) & 2) ? 0 : 0xffff;
 127}
 128
 129static const struct radio_isa_ops terratec_ops = {
 130        .alloc = terratec_alloc,
 131        .s_mute_volume = terratec_s_mute_volume,
 132        .s_frequency = terratec_s_frequency,
 133        .g_signal = terratec_g_signal,
 134};
 135
 136static const int terratec_ioports[] = { 0x590 };
 137
 138static struct radio_isa_driver terratec_driver = {
 139        .driver = {
 140                .match          = radio_isa_match,
 141                .probe          = radio_isa_probe,
 142                .remove         = radio_isa_remove,
 143                .driver         = {
 144                        .name   = "radio-terratec",
 145                },
 146        },
 147        .io_params = &io,
 148        .radio_nr_params = &radio_nr,
 149        .io_ports = terratec_ioports,
 150        .num_of_io_ports = ARRAY_SIZE(terratec_ioports),
 151        .region_size = 2,
 152        .card = "TerraTec ActiveRadio",
 153        .ops = &terratec_ops,
 154        .has_stereo = true,
 155        .max_volume = 10,
 156};
 157
 158static int __init terratec_init(void)
 159{
 160        return isa_register_driver(&terratec_driver.driver, 1);
 161}
 162
 163static void __exit terratec_exit(void)
 164{
 165        isa_unregister_driver(&terratec_driver.driver);
 166}
 167
 168module_init(terratec_init);
 169module_exit(terratec_exit);
 170
 171