linux/drivers/media/radio/radio-aimslab.c
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   1/*
   2 * AimsLab RadioTrack (aka RadioVeveal) driver
   3 *
   4 * Copyright 1997 M. Kirkwood
   5 *
   6 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
   7 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
   8 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
   9 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
  10 *
  11 * Notes on the hardware (reverse engineered from other peoples'
  12 * reverse engineering of AIMS' code :-)
  13 *
  14 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  15 *
  16 *  The signal strength query is unsurprisingly inaccurate.  And it seems
  17 *  to indicate that (on my card, at least) the frequency setting isn't
  18 *  too great.  (I have to tune up .025MHz from what the freq should be
  19 *  to get a report that the thing is tuned.)
  20 *
  21 *  Volume control is (ugh) analogue:
  22 *   out(port, start_increasing_volume);
  23 *   wait(a_wee_while);
  24 *   out(port, stop_changing_the_volume);
  25 *
  26 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
  27 */
  28
  29#include <linux/module.h>       /* Modules                      */
  30#include <linux/init.h>         /* Initdata                     */
  31#include <linux/ioport.h>       /* request_region               */
  32#include <linux/delay.h>        /* msleep                       */
  33#include <linux/videodev2.h>    /* kernel radio structs         */
  34#include <linux/io.h>           /* outb, outb_p                 */
  35#include <linux/slab.h>
  36#include <media/v4l2-device.h>
  37#include <media/v4l2-ioctl.h>
  38#include <media/v4l2-ctrls.h>
  39#include "radio-isa.h"
  40#include "lm7000.h"
  41
  42MODULE_AUTHOR("M. Kirkwood");
  43MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
  44MODULE_LICENSE("GPL");
  45MODULE_VERSION("1.0.0");
  46
  47#ifndef CONFIG_RADIO_RTRACK_PORT
  48#define CONFIG_RADIO_RTRACK_PORT -1
  49#endif
  50
  51#define RTRACK_MAX 2
  52
  53static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT,
  54                              [1 ... (RTRACK_MAX - 1)] = -1 };
  55static int radio_nr[RTRACK_MAX] = { [0 ... (RTRACK_MAX - 1)] = -1 };
  56
  57module_param_array(io, int, NULL, 0444);
  58MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
  59module_param_array(radio_nr, int, NULL, 0444);
  60MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  61
  62struct rtrack {
  63        struct radio_isa_card isa;
  64        int curvol;
  65};
  66
  67static struct radio_isa_card *rtrack_alloc(void)
  68{
  69        struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL);
  70
  71        if (rt)
  72                rt->curvol = 0xff;
  73        return rt ? &rt->isa : NULL;
  74}
  75
  76#define AIMS_BIT_TUN_CE         (1 << 0)
  77#define AIMS_BIT_TUN_CLK        (1 << 1)
  78#define AIMS_BIT_TUN_DATA       (1 << 2)
  79#define AIMS_BIT_VOL_CE         (1 << 3)
  80#define AIMS_BIT_TUN_STRQ       (1 << 4)
  81/* bit 5 is not connected */
  82#define AIMS_BIT_VOL_UP         (1 << 6)        /* active low */
  83#define AIMS_BIT_VOL_DN         (1 << 7)        /* active low */
  84
  85static void rtrack_set_pins(void *handle, u8 pins)
  86{
  87        struct radio_isa_card *isa = handle;
  88        struct rtrack *rt = container_of(isa, struct rtrack, isa);
  89        u8 bits = AIMS_BIT_VOL_DN | AIMS_BIT_VOL_UP | AIMS_BIT_TUN_STRQ;
  90
  91        if (!v4l2_ctrl_g_ctrl(rt->isa.mute))
  92                bits |= AIMS_BIT_VOL_CE;
  93
  94        if (pins & LM7000_DATA)
  95                bits |= AIMS_BIT_TUN_DATA;
  96        if (pins & LM7000_CLK)
  97                bits |= AIMS_BIT_TUN_CLK;
  98        if (pins & LM7000_CE)
  99                bits |= AIMS_BIT_TUN_CE;
 100
 101        outb_p(bits, rt->isa.io);
 102}
 103
 104static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq)
 105{
 106        lm7000_set_freq(freq, isa, rtrack_set_pins);
 107
 108        return 0;
 109}
 110
 111static u32 rtrack_g_signal(struct radio_isa_card *isa)
 112{
 113        /* bit set = no signal present */
 114        return 0xffff * !(inb(isa->io) & 2);
 115}
 116
 117static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
 118{
 119        struct rtrack *rt = container_of(isa, struct rtrack, isa);
 120        int curvol = rt->curvol;
 121
 122        if (mute) {
 123                outb(0xd0, isa->io);    /* volume steady + sigstr + off */
 124                return 0;
 125        }
 126        if (vol == 0) {                 /* volume = 0 means mute the card */
 127                outb(0x48, isa->io);    /* volume down but still "on"   */
 128                msleep(curvol * 3);     /* make sure it's totally down  */
 129        } else if (curvol < vol) {
 130                outb(0x98, isa->io);    /* volume up + sigstr + on      */
 131                for (; curvol < vol; curvol++)
 132                        mdelay(3);
 133        } else if (curvol > vol) {
 134                outb(0x58, isa->io);    /* volume down + sigstr + on    */
 135                for (; curvol > vol; curvol--)
 136                        mdelay(3);
 137        }
 138        outb(0xd8, isa->io);            /* volume steady + sigstr + on  */
 139        rt->curvol = vol;
 140        return 0;
 141}
 142
 143/* Mute card - prevents noisy bootups */
 144static int rtrack_initialize(struct radio_isa_card *isa)
 145{
 146        /* this ensures that the volume is all the way up  */
 147        outb(0x90, isa->io);    /* volume up but still "on"     */
 148        msleep(3000);           /* make sure it's totally up    */
 149        outb(0xc0, isa->io);    /* steady volume, mute card     */
 150        return 0;
 151}
 152
 153static const struct radio_isa_ops rtrack_ops = {
 154        .alloc = rtrack_alloc,
 155        .init = rtrack_initialize,
 156        .s_mute_volume = rtrack_s_mute_volume,
 157        .s_frequency = rtrack_s_frequency,
 158        .g_signal = rtrack_g_signal,
 159};
 160
 161static const int rtrack_ioports[] = { 0x20f, 0x30f };
 162
 163static struct radio_isa_driver rtrack_driver = {
 164        .driver = {
 165                .match          = radio_isa_match,
 166                .probe          = radio_isa_probe,
 167                .remove         = radio_isa_remove,
 168                .driver         = {
 169                        .name   = "radio-aimslab",
 170                },
 171        },
 172        .io_params = io,
 173        .radio_nr_params = radio_nr,
 174        .io_ports = rtrack_ioports,
 175        .num_of_io_ports = ARRAY_SIZE(rtrack_ioports),
 176        .region_size = 2,
 177        .card = "AIMSlab RadioTrack/RadioReveal",
 178        .ops = &rtrack_ops,
 179        .has_stereo = true,
 180        .max_volume = 0xff,
 181};
 182
 183static int __init rtrack_init(void)
 184{
 185        return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);
 186}
 187
 188static void __exit rtrack_exit(void)
 189{
 190        isa_unregister_driver(&rtrack_driver.driver);
 191}
 192
 193module_init(rtrack_init);
 194module_exit(rtrack_exit);
 195