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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
   3 * (c) 1999 R. Offermanns (rolf@offermanns.de)
   4 * based on the aimslab radio driver from M. Kirkwood
   5 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
   6 *
   7 *
   8 * History:
   9 * 1999-05-21   First preview release
  10 *
  11 *  Notes on the hardware:
  12 *  There are two "main" chips on the card:
  13 *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
  14 *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
  15 *  (you can get the datasheet at the above links)
  16 *
  17 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  18 *  Volume Control is done digitally
  19 *
  20 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  21 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
  22 */
  23
  24#include <linux/module.h>       /* Modules                      */
  25#include <linux/init.h>         /* Initdata                     */
  26#include <linux/ioport.h>       /* request_region               */
  27#include <linux/videodev2.h>    /* kernel radio structs         */
  28#include <linux/mutex.h>
  29#include <linux/io.h>           /* outb, outb_p                 */
  30#include <linux/slab.h>
  31#include <media/v4l2-device.h>
  32#include <media/v4l2-ioctl.h>
  33#include "radio-isa.h"
  34
  35MODULE_AUTHOR("R. Offermans & others");
  36MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
  37MODULE_LICENSE("GPL");
  38MODULE_VERSION("0.1.99");
  39
  40/* Note: there seems to be only one possible port (0x590), but without
  41   hardware this is hard to verify. For now, this is the only one we will
  42   support. */
  43static int io = 0x590;
  44static int radio_nr = -1;
  45
  46module_param(radio_nr, int, 0444);
  47MODULE_PARM_DESC(radio_nr, "Radio device number");
  48
  49#define WRT_DIS         0x00
  50#define CLK_OFF         0x00
  51#define IIC_DATA        0x01
  52#define IIC_CLK         0x02
  53#define DATA            0x04
  54#define CLK_ON          0x08
  55#define WRT_EN          0x10
  56
  57static struct radio_isa_card *terratec_alloc(void)
  58{
  59        return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
  60}
  61
  62static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  63{
  64        int i;
  65
  66        if (mute)
  67                vol = 0;
  68        vol = vol + (vol * 32); /* change both channels */
  69        for (i = 0; i < 8; i++) {
  70                if (vol & (0x80 >> i))
  71                        outb(0x80, isa->io + 1);
  72                else
  73                        outb(0x00, isa->io + 1);
  74        }
  75        return 0;
  76}
  77
  78
  79/* this is the worst part in this driver */
  80/* many more or less strange things are going on here, but hey, it works :) */
  81
  82static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
  83{
  84        int i;
  85        int p;
  86        int temp;
  87        long rest;
  88        unsigned char buffer[25];               /* we have to bit shift 25 registers */
  89
  90        freq = freq / 160;                      /* convert the freq. to a nice to handle value */
  91        memset(buffer, 0, sizeof(buffer));
  92
  93        rest = freq * 10 + 10700;       /* I once had understood what is going on here */
  94                                        /* maybe some wise guy (friedhelm?) can comment this stuff */
  95        i = 13;
  96        p = 10;
  97        temp = 102400;
  98        while (rest != 0) {
  99                if (rest % temp  == rest)
 100                        buffer[i] = 0;
 101                else {
 102                        buffer[i] = 1;
 103                        rest = rest - temp;
 104                }
 105                i--;
 106                p--;
 107                temp = temp / 2;
 108        }
 109
 110        for (i = 24; i > -1; i--) {     /* bit shift the values to the radiocard */
 111                if (buffer[i] == 1) {
 112                        outb(WRT_EN | DATA, isa->io);
 113                        outb(WRT_EN | DATA | CLK_ON, isa->io);
 114                        outb(WRT_EN | DATA, isa->io);
 115                } else {
 116                        outb(WRT_EN | 0x00, isa->io);
 117                        outb(WRT_EN | 0x00 | CLK_ON, isa->io);
 118                }
 119        }
 120        outb(0x00, isa->io);
 121        return 0;
 122}
 123
 124static u32 terratec_g_signal(struct radio_isa_card *isa)
 125{
 126        /* bit set = no signal present  */
 127        return (inb(isa->io) & 2) ? 0 : 0xffff;
 128}
 129
 130static const struct radio_isa_ops terratec_ops = {
 131        .alloc = terratec_alloc,
 132        .s_mute_volume = terratec_s_mute_volume,
 133        .s_frequency = terratec_s_frequency,
 134        .g_signal = terratec_g_signal,
 135};
 136
 137static const int terratec_ioports[] = { 0x590 };
 138
 139static struct radio_isa_driver terratec_driver = {
 140        .driver = {
 141                .match          = radio_isa_match,
 142                .probe          = radio_isa_probe,
 143                .remove         = radio_isa_remove,
 144                .driver         = {
 145                        .name   = "radio-terratec",
 146                },
 147        },
 148        .io_params = &io,
 149        .radio_nr_params = &radio_nr,
 150        .io_ports = terratec_ioports,
 151        .num_of_io_ports = ARRAY_SIZE(terratec_ioports),
 152        .region_size = 2,
 153        .card = "TerraTec ActiveRadio",
 154        .ops = &terratec_ops,
 155        .has_stereo = true,
 156        .max_volume = 10,
 157};
 158
 159static int __init terratec_init(void)
 160{
 161        return isa_register_driver(&terratec_driver.driver, 1);
 162}
 163
 164static void __exit terratec_exit(void)
 165{
 166        isa_unregister_driver(&terratec_driver.driver);
 167}
 168
 169module_init(terratec_init);
 170module_exit(terratec_exit);
 171
 172