linux/drivers/media/radio/radio-aztech.c
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   1/* radio-aztech.c - Aztech radio card driver for Linux 2.2
   2 *
   3 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
   4 * Adapted to support the Video for Linux API by
   5 * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
   6 *
   7 * Quay Ly
   8 * Donald Song
   9 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  10 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  11 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  12 *
  13 * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
  14 * along with more information on the card itself.
  15 *
  16 * History:
  17 * 1999-02-24   Russell Kroll <rkroll@exploits.org>
  18 *              Fine tuning/VIDEO_TUNER_LOW
  19 *              Range expanded to 87-108 MHz (from 87.9-107.8)
  20 *
  21 * Notable changes from the original source:
  22 * - includes stripped down to the essentials
  23 * - for loops used as delays replaced with udelay()
  24 * - #defines removed, changed to static values
  25 * - tuning structure changed - no more character arrays, other changes
  26*/
  27
  28#include <linux/module.h>       /* Modules                      */
  29#include <linux/init.h>         /* Initdata                     */
  30#include <linux/ioport.h>       /* request_region               */
  31#include <linux/delay.h>        /* udelay                       */
  32#include <linux/videodev2.h>    /* kernel radio structs         */
  33#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  34#include <linux/io.h>           /* outb, outb_p                 */
  35#include <media/v4l2-device.h>
  36#include <media/v4l2-ioctl.h>
  37
  38MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  39MODULE_DESCRIPTION("A driver for the Aztech radio card.");
  40MODULE_LICENSE("GPL");
  41
  42/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  43
  44#ifndef CONFIG_RADIO_AZTECH_PORT
  45#define CONFIG_RADIO_AZTECH_PORT -1
  46#endif
  47
  48static int io = CONFIG_RADIO_AZTECH_PORT;
  49static int radio_nr = -1;
  50static int radio_wait_time = 1000;
  51
  52module_param(io, int, 0);
  53module_param(radio_nr, int, 0);
  54MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
  55
  56#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  57
  58struct aztech
  59{
  60        struct v4l2_device v4l2_dev;
  61        struct video_device vdev;
  62        int io;
  63        int curvol;
  64        unsigned long curfreq;
  65        int stereo;
  66        struct mutex lock;
  67};
  68
  69static struct aztech aztech_card;
  70
  71static int volconvert(int level)
  72{
  73        level >>= 14;           /* Map 16bits down to 2 bit */
  74        level &= 3;
  75
  76        /* convert to card-friendly values */
  77        switch (level) {
  78        case 0:
  79                return 0;
  80        case 1:
  81                return 1;
  82        case 2:
  83                return 4;
  84        case 3:
  85                return 5;
  86        }
  87        return 0;       /* Quieten gcc */
  88}
  89
  90static void send_0_byte(struct aztech *az)
  91{
  92        udelay(radio_wait_time);
  93        outb_p(2 + volconvert(az->curvol), az->io);
  94        outb_p(64 + 2 + volconvert(az->curvol), az->io);
  95}
  96
  97static void send_1_byte(struct aztech *az)
  98{
  99        udelay (radio_wait_time);
 100        outb_p(128 + 2 + volconvert(az->curvol), az->io);
 101        outb_p(128 + 64 + 2 + volconvert(az->curvol), az->io);
 102}
 103
 104static int az_setvol(struct aztech *az, int vol)
 105{
 106        mutex_lock(&az->lock);
 107        outb(volconvert(vol), az->io);
 108        mutex_unlock(&az->lock);
 109        return 0;
 110}
 111
 112/* thanks to Michael Dwyer for giving me a dose of clues in
 113 * the signal strength department..
 114 *
 115 * This card has a stereo bit - bit 0 set = mono, not set = stereo
 116 * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 117 *
 118 */
 119
 120static int az_getsigstr(struct aztech *az)
 121{
 122        int sig = 1;
 123
 124        mutex_lock(&az->lock);
 125        if (inb(az->io) & 2)    /* bit set = no signal present */
 126                sig = 0;
 127        mutex_unlock(&az->lock);
 128        return sig;
 129}
 130
 131static int az_getstereo(struct aztech *az)
 132{
 133        int stereo = 1;
 134
 135        mutex_lock(&az->lock);
 136        if (inb(az->io) & 1)    /* bit set = mono */
 137                stereo = 0;
 138        mutex_unlock(&az->lock);
 139        return stereo;
 140}
 141
 142static int az_setfreq(struct aztech *az, unsigned long frequency)
 143{
 144        int  i;
 145
 146        mutex_lock(&az->lock);
 147
 148        az->curfreq = frequency;
 149        frequency += 171200;            /* Add 10.7 MHz IF              */
 150        frequency /= 800;               /* Convert to 50 kHz units      */
 151
 152        send_0_byte(az);                /*  0: LSB of frequency       */
 153
 154        for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)  */
 155                if (frequency & (1 << i))
 156                        send_1_byte(az);
 157                else
 158                        send_0_byte(az);
 159
 160        send_0_byte(az);                /* 14: test bit - always 0    */
 161        send_0_byte(az);                /* 15: test bit - always 0    */
 162        send_0_byte(az);                /* 16: band data 0 - always 0 */
 163        if (az->stereo)         /* 17: stereo (1 to enable)   */
 164                send_1_byte(az);
 165        else
 166                send_0_byte(az);
 167
 168        send_1_byte(az);                /* 18: band data 1 - unknown  */
 169        send_0_byte(az);                /* 19: time base - always 0   */
 170        send_0_byte(az);                /* 20: spacing (0 = 25 kHz)   */
 171        send_1_byte(az);                /* 21: spacing (1 = 25 kHz)   */
 172        send_0_byte(az);                /* 22: spacing (0 = 25 kHz)   */
 173        send_1_byte(az);                /* 23: AM/FM (FM = 1, always) */
 174
 175        /* latch frequency */
 176
 177        udelay(radio_wait_time);
 178        outb_p(128 + 64 + volconvert(az->curvol), az->io);
 179
 180        mutex_unlock(&az->lock);
 181
 182        return 0;
 183}
 184
 185static int vidioc_querycap(struct file *file, void  *priv,
 186                                        struct v4l2_capability *v)
 187{
 188        strlcpy(v->driver, "radio-aztech", sizeof(v->driver));
 189        strlcpy(v->card, "Aztech Radio", sizeof(v->card));
 190        strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 191        v->version = RADIO_VERSION;
 192        v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 193        return 0;
 194}
 195
 196static int vidioc_g_tuner(struct file *file, void *priv,
 197                                struct v4l2_tuner *v)
 198{
 199        struct aztech *az = video_drvdata(file);
 200
 201        if (v->index > 0)
 202                return -EINVAL;
 203
 204        strlcpy(v->name, "FM", sizeof(v->name));
 205        v->type = V4L2_TUNER_RADIO;
 206
 207        v->rangelow = 87 * 16000;
 208        v->rangehigh = 108 * 16000;
 209        v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 210        v->capability = V4L2_TUNER_CAP_LOW;
 211        if (az_getstereo(az))
 212                v->audmode = V4L2_TUNER_MODE_STEREO;
 213        else
 214                v->audmode = V4L2_TUNER_MODE_MONO;
 215        v->signal = 0xFFFF * az_getsigstr(az);
 216
 217        return 0;
 218}
 219
 220static int vidioc_s_tuner(struct file *file, void *priv,
 221                                struct v4l2_tuner *v)
 222{
 223        return v->index ? -EINVAL : 0;
 224}
 225
 226static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 227{
 228        *i = 0;
 229        return 0;
 230}
 231
 232static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 233{
 234        return i ? -EINVAL : 0;
 235}
 236
 237static int vidioc_g_audio(struct file *file, void *priv,
 238                           struct v4l2_audio *a)
 239{
 240        a->index = 0;
 241        strlcpy(a->name, "Radio", sizeof(a->name));
 242        a->capability = V4L2_AUDCAP_STEREO;
 243        return 0;
 244}
 245
 246static int vidioc_s_audio(struct file *file, void *priv,
 247                           struct v4l2_audio *a)
 248{
 249        return a->index ? -EINVAL : 0;
 250}
 251
 252static int vidioc_s_frequency(struct file *file, void *priv,
 253                                struct v4l2_frequency *f)
 254{
 255        struct aztech *az = video_drvdata(file);
 256
 257        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 258                return -EINVAL;
 259        az_setfreq(az, f->frequency);
 260        return 0;
 261}
 262
 263static int vidioc_g_frequency(struct file *file, void *priv,
 264                                struct v4l2_frequency *f)
 265{
 266        struct aztech *az = video_drvdata(file);
 267
 268        if (f->tuner != 0)
 269                return -EINVAL;
 270        f->type = V4L2_TUNER_RADIO;
 271        f->frequency = az->curfreq;
 272        return 0;
 273}
 274
 275static int vidioc_queryctrl(struct file *file, void *priv,
 276                            struct v4l2_queryctrl *qc)
 277{
 278        switch (qc->id) {
 279        case V4L2_CID_AUDIO_MUTE:
 280                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 281        case V4L2_CID_AUDIO_VOLUME:
 282                return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
 283        }
 284        return -EINVAL;
 285}
 286
 287static int vidioc_g_ctrl(struct file *file, void *priv,
 288                            struct v4l2_control *ctrl)
 289{
 290        struct aztech *az = video_drvdata(file);
 291
 292        switch (ctrl->id) {
 293        case V4L2_CID_AUDIO_MUTE:
 294                if (az->curvol == 0)
 295                        ctrl->value = 1;
 296                else
 297                        ctrl->value = 0;
 298                return 0;
 299        case V4L2_CID_AUDIO_VOLUME:
 300                ctrl->value = az->curvol * 6554;
 301                return 0;
 302        }
 303        return -EINVAL;
 304}
 305
 306static int vidioc_s_ctrl(struct file *file, void *priv,
 307                            struct v4l2_control *ctrl)
 308{
 309        struct aztech *az = video_drvdata(file);
 310
 311        switch (ctrl->id) {
 312        case V4L2_CID_AUDIO_MUTE:
 313                if (ctrl->value)
 314                        az_setvol(az, 0);
 315                else
 316                        az_setvol(az, az->curvol);
 317                return 0;
 318        case V4L2_CID_AUDIO_VOLUME:
 319                az_setvol(az, ctrl->value);
 320                return 0;
 321        }
 322        return -EINVAL;
 323}
 324
 325static const struct v4l2_file_operations aztech_fops = {
 326        .owner          = THIS_MODULE,
 327        .ioctl          = video_ioctl2,
 328};
 329
 330static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
 331        .vidioc_querycap    = vidioc_querycap,
 332        .vidioc_g_tuner     = vidioc_g_tuner,
 333        .vidioc_s_tuner     = vidioc_s_tuner,
 334        .vidioc_g_audio     = vidioc_g_audio,
 335        .vidioc_s_audio     = vidioc_s_audio,
 336        .vidioc_g_input     = vidioc_g_input,
 337        .vidioc_s_input     = vidioc_s_input,
 338        .vidioc_g_frequency = vidioc_g_frequency,
 339        .vidioc_s_frequency = vidioc_s_frequency,
 340        .vidioc_queryctrl   = vidioc_queryctrl,
 341        .vidioc_g_ctrl      = vidioc_g_ctrl,
 342        .vidioc_s_ctrl      = vidioc_s_ctrl,
 343};
 344
 345static int __init aztech_init(void)
 346{
 347        struct aztech *az = &aztech_card;
 348        struct v4l2_device *v4l2_dev = &az->v4l2_dev;
 349        int res;
 350
 351        strlcpy(v4l2_dev->name, "aztech", sizeof(v4l2_dev->name));
 352        az->io = io;
 353
 354        if (az->io == -1) {
 355                v4l2_err(v4l2_dev, "you must set an I/O address with io=0x350 or 0x358\n");
 356                return -EINVAL;
 357        }
 358
 359        if (!request_region(az->io, 2, "aztech")) {
 360                v4l2_err(v4l2_dev, "port 0x%x already in use\n", az->io);
 361                return -EBUSY;
 362        }
 363
 364        res = v4l2_device_register(NULL, v4l2_dev);
 365        if (res < 0) {
 366                release_region(az->io, 2);
 367                v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 368                return res;
 369        }
 370
 371        mutex_init(&az->lock);
 372        strlcpy(az->vdev.name, v4l2_dev->name, sizeof(az->vdev.name));
 373        az->vdev.v4l2_dev = v4l2_dev;
 374        az->vdev.fops = &aztech_fops;
 375        az->vdev.ioctl_ops = &aztech_ioctl_ops;
 376        az->vdev.release = video_device_release_empty;
 377        video_set_drvdata(&az->vdev, az);
 378
 379        if (video_register_device(&az->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 380                v4l2_device_unregister(v4l2_dev);
 381                release_region(az->io, 2);
 382                return -EINVAL;
 383        }
 384
 385        v4l2_info(v4l2_dev, "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 386        /* mute card - prevents noisy bootups */
 387        outb(0, az->io);
 388        return 0;
 389}
 390
 391static void __exit aztech_exit(void)
 392{
 393        struct aztech *az = &aztech_card;
 394
 395        video_unregister_device(&az->vdev);
 396        v4l2_device_unregister(&az->v4l2_dev);
 397        release_region(az->io, 2);
 398}
 399
 400module_init(aztech_init);
 401module_exit(aztech_exit);
 402