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

   1/*
   2 * GemTek radio card driver
   3 *
   4 * Copyright 1998 Jonas Munsin <jmunsin@iki.fi>
   5 *
   6 * GemTek hasn't released any specs on the card, so the protocol had to
   7 * be reverse engineered with dosemu.
   8 *
   9 * Besides the protocol changes, this is mostly a copy of:
  10 *
  11 *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
  12 *
  13 *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
  14 *    Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
  15 *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
  16 *
  17 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  18 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  19 *
  20 * Note: this card seems to swap the left and right audio channels!
  21 *
  22 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
  23 */
  24
  25#include <linux/module.h>       /* Modules                      */
  26#include <linux/init.h>         /* Initdata                     */
  27#include <linux/ioport.h>       /* request_region               */
  28#include <linux/delay.h>        /* udelay                       */
  29#include <linux/videodev2.h>    /* kernel radio structs         */
  30#include <linux/mutex.h>
  31#include <linux/io.h>           /* outb, outb_p                 */
  32#include <linux/pnp.h>
  33#include <linux/slab.h>
  34#include <media/v4l2-ioctl.h>
  35#include <media/v4l2-device.h>
  36#include "radio-isa.h"
  37
  38/*
  39 * Module info.
  40 */
  41
  42MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
  43MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
  44MODULE_LICENSE("GPL");
  45MODULE_VERSION("1.0.0");
  46
  47/*
  48 * Module params.
  49 */
  50
  51#ifndef CONFIG_RADIO_GEMTEK_PORT
  52#define CONFIG_RADIO_GEMTEK_PORT -1
  53#endif
  54#ifndef CONFIG_RADIO_GEMTEK_PROBE
  55#define CONFIG_RADIO_GEMTEK_PROBE 1
  56#endif
  57
  58#define GEMTEK_MAX 4
  59
  60static bool probe = CONFIG_RADIO_GEMTEK_PROBE;
  61static bool hardmute;
  62static int io[GEMTEK_MAX] = { [0] = CONFIG_RADIO_GEMTEK_PORT,
  63                              [1 ... (GEMTEK_MAX - 1)] = -1 };
  64static int radio_nr[GEMTEK_MAX] = { [0 ... (GEMTEK_MAX - 1)] = -1 };
  65
  66module_param(probe, bool, 0444);
  67MODULE_PARM_DESC(probe, "Enable automatic device probing.");
  68
  69module_param(hardmute, bool, 0644);
  70MODULE_PARM_DESC(hardmute, "Enable 'hard muting' by shutting down PLL, may "
  71         "reduce static noise.");
  72
  73module_param_array(io, int, NULL, 0444);
  74MODULE_PARM_DESC(io, "Force I/O ports for the GemTek Radio card if automatic "
  75         "probing is disabled or fails. The most common I/O ports are: 0x20c "
  76         "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
  77         "work for the combined sound/radiocard).");
  78
  79module_param_array(radio_nr, int, NULL, 0444);
  80MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  81
  82/*
  83 * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
  84 * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
  85 */
  86#define FSCALE          8
  87#define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
  88#define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
  89
  90#define GEMTEK_CK               0x01    /* Clock signal                 */
  91#define GEMTEK_DA               0x02    /* Serial data                  */
  92#define GEMTEK_CE               0x04    /* Chip enable                  */
  93#define GEMTEK_NS               0x08    /* No signal                    */
  94#define GEMTEK_MT               0x10    /* Line mute                    */
  95#define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
  96#define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
  97
  98#define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
  99
 100#define SHORT_DELAY 5           /* usec */
 101#define LONG_DELAY 75           /* usec */
 102
 103struct gemtek {
 104        struct radio_isa_card isa;
 105        bool muted;
 106        u32 bu2614data;
 107};
 108
 109#define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
 110#define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
 111#define BU2614_VOID_BITS        4 /* unused                             */
 112#define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
 113#define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
 114#define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
 115#define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
 116#define BU2614_VOID2_BITS       1 /* unused                             */
 117#define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
 118#define BU2614_TEST_BITS        1 /* TS, Test data is input             */
 119
 120#define BU2614_FREQ_SHIFT       0
 121#define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
 122#define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
 123#define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
 124#define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
 125#define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
 126#define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
 127#define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
 128#define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
 129#define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
 130
 131#define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
 132                        BU2614_##field##_SHIFT)
 133#define BU2614_PORT_MASK        MKMASK(PORT)
 134#define BU2614_FREQ_MASK        MKMASK(FREQ)
 135#define BU2614_VOID_MASK        MKMASK(VOID)
 136#define BU2614_FMES_MASK        MKMASK(FMES)
 137#define BU2614_STDF_MASK        MKMASK(STDF)
 138#define BU2614_SWIN_MASK        MKMASK(SWIN)
 139#define BU2614_SWAL_MASK        MKMASK(SWAL)
 140#define BU2614_VOID2_MASK       MKMASK(VOID2)
 141#define BU2614_FMUN_MASK        MKMASK(FMUN)
 142#define BU2614_TEST_MASK        MKMASK(TEST)
 143
 144/*
 145 * Set data which will be sent to BU2614FS.
 146 */
 147#define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
 148        ((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
 149
 150/*
 151 * Transmit settings to BU2614FS over GemTek IC.
 152 */
 153static void gemtek_bu2614_transmit(struct gemtek *gt)
 154{
 155        struct radio_isa_card *isa = &gt->isa;
 156        int i, bit, q, mute;
 157
 158        mute = gt->muted ? GEMTEK_MT : 0x00;
 159
 160        outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, isa->io);
 161        udelay(LONG_DELAY);
 162
 163        for (i = 0, q = gt->bu2614data; i < 32; i++, q >>= 1) {
 164                bit = (q & 1) ? GEMTEK_DA : 0;
 165                outb_p(mute | GEMTEK_CE | bit, isa->io);
 166                udelay(SHORT_DELAY);
 167                outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, isa->io);
 168                udelay(SHORT_DELAY);
 169        }
 170
 171        outb_p(mute | GEMTEK_DA | GEMTEK_CK, isa->io);
 172        udelay(SHORT_DELAY);
 173}
 174
 175/*
 176 * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
 177 */
 178static unsigned long gemtek_convfreq(unsigned long freq)
 179{
 180        return ((freq << FSCALE) + IF_OFFSET + REF_FREQ / 2) / REF_FREQ;
 181}
 182
 183static struct radio_isa_card *gemtek_alloc(void)
 184{
 185        struct gemtek *gt = kzalloc(sizeof(*gt), GFP_KERNEL);
 186
 187        if (gt)
 188                gt->muted = true;
 189        return gt ? &gt->isa : NULL;
 190}
 191
 192/*
 193 * Set FM-frequency.
 194 */
 195static int gemtek_s_frequency(struct radio_isa_card *isa, u32 freq)
 196{
 197        struct gemtek *gt = container_of(isa, struct gemtek, isa);
 198
 199        if (hardmute && gt->muted)
 200                return 0;
 201
 202        gemtek_bu2614_set(gt, BU2614_PORT, 0);
 203        gemtek_bu2614_set(gt, BU2614_FMES, 0);
 204        gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
 205        gemtek_bu2614_set(gt, BU2614_SWAL, 0);
 206        gemtek_bu2614_set(gt, BU2614_FMUN, 1);  /* GT bit set   */
 207        gemtek_bu2614_set(gt, BU2614_TEST, 0);
 208        gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
 209        gemtek_bu2614_set(gt, BU2614_FREQ, gemtek_convfreq(freq));
 210        gemtek_bu2614_transmit(gt);
 211        return 0;
 212}
 213
 214/*
 215 * Set mute flag.
 216 */
 217static int gemtek_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
 218{
 219        struct gemtek *gt = container_of(isa, struct gemtek, isa);
 220        int i;
 221
 222        gt->muted = mute;
 223        if (hardmute) {
 224                if (!mute)
 225                        return gemtek_s_frequency(isa, isa->freq);
 226
 227                /* Turn off PLL, disable data output */
 228                gemtek_bu2614_set(gt, BU2614_PORT, 0);
 229                gemtek_bu2614_set(gt, BU2614_FMES, 0);  /* CT bit off   */
 230                gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
 231                gemtek_bu2614_set(gt, BU2614_SWAL, 0);
 232                gemtek_bu2614_set(gt, BU2614_FMUN, 0);  /* GT bit off   */
 233                gemtek_bu2614_set(gt, BU2614_TEST, 0);
 234                gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_PLL_OFF);
 235                gemtek_bu2614_set(gt, BU2614_FREQ, 0);
 236                gemtek_bu2614_transmit(gt);
 237                return 0;
 238        }
 239
 240        /* Read bus contents (CE, CK and DA). */
 241        i = inb_p(isa->io);
 242        /* Write it back with mute flag set. */
 243        outb_p((i >> 5) | (mute ? GEMTEK_MT : 0), isa->io);
 244        udelay(SHORT_DELAY);
 245        return 0;
 246}
 247
 248static u32 gemtek_g_rxsubchans(struct radio_isa_card *isa)
 249{
 250        if (inb_p(isa->io) & GEMTEK_NS)
 251                return V4L2_TUNER_SUB_MONO;
 252        return V4L2_TUNER_SUB_STEREO;
 253}
 254
 255/*
 256 * Check if requested card acts like GemTek Radio card.
 257 */
 258static bool gemtek_probe(struct radio_isa_card *isa, int io)
 259{
 260        int i, q;
 261
 262        q = inb_p(io);  /* Read bus contents before probing. */
 263        /* Try to turn on CE, CK and DA respectively and check if card responds
 264           properly. */
 265        for (i = 0; i < 3; ++i) {
 266                outb_p(1 << i, io);
 267                udelay(SHORT_DELAY);
 268
 269                if ((inb_p(io) & ~GEMTEK_NS) != (0x17 | (1 << (i + 5))))
 270                        return false;
 271        }
 272        outb_p(q >> 5, io);     /* Write bus contents back. */
 273        udelay(SHORT_DELAY);
 274        return true;
 275}
 276
 277static const struct radio_isa_ops gemtek_ops = {
 278        .alloc = gemtek_alloc,
 279        .probe = gemtek_probe,
 280        .s_mute_volume = gemtek_s_mute_volume,
 281        .s_frequency = gemtek_s_frequency,
 282        .g_rxsubchans = gemtek_g_rxsubchans,
 283};
 284
 285static const int gemtek_ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
 286
 287#ifdef CONFIG_PNP
 288static struct pnp_device_id gemtek_pnp_devices[] = {
 289        /* AOpen FX-3D/Pro Radio */
 290        {.id = "ADS7183", .driver_data = 0},
 291        {.id = ""}
 292};
 293
 294MODULE_DEVICE_TABLE(pnp, gemtek_pnp_devices);
 295#endif
 296
 297static struct radio_isa_driver gemtek_driver = {
 298        .driver = {
 299                .match          = radio_isa_match,
 300                .probe          = radio_isa_probe,
 301                .remove         = radio_isa_remove,
 302                .driver         = {
 303                        .name   = "radio-gemtek",
 304                },
 305        },
 306#ifdef CONFIG_PNP
 307        .pnp_driver = {
 308                .name           = "radio-gemtek",
 309                .id_table       = gemtek_pnp_devices,
 310                .probe          = radio_isa_pnp_probe,
 311                .remove         = radio_isa_pnp_remove,
 312        },
 313#endif
 314        .io_params = io,
 315        .radio_nr_params = radio_nr,
 316        .io_ports = gemtek_ioports,
 317        .num_of_io_ports = ARRAY_SIZE(gemtek_ioports),
 318        .region_size = 1,
 319        .card = "GemTek Radio",
 320        .ops = &gemtek_ops,
 321        .has_stereo = true,
 322};
 323
 324static int __init gemtek_init(void)
 325{
 326        gemtek_driver.probe = probe;
 327#ifdef CONFIG_PNP
 328        pnp_register_driver(&gemtek_driver.pnp_driver);
 329#endif
 330        return isa_register_driver(&gemtek_driver.driver, GEMTEK_MAX);
 331}
 332
 333static void __exit gemtek_exit(void)
 334{
 335        hardmute = true;        /* Turn off PLL */
 336#ifdef CONFIG_PNP
 337        pnp_unregister_driver(&gemtek_driver.pnp_driver);
 338#endif
 339        isa_unregister_driver(&gemtek_driver.driver);
 340}
 341
 342module_init(gemtek_init);
 343module_exit(gemtek_exit);
 344