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/io.h>           /* outb, outb_p                 */
  34#include <media/v4l2-device.h>
  35#include <media/v4l2-ioctl.h>
  36
  37MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  38MODULE_DESCRIPTION("A driver for the Aztech radio card.");
  39MODULE_LICENSE("GPL");
  40MODULE_VERSION("0.0.3");
  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
  56struct aztech
  57{
  58        struct v4l2_device v4l2_dev;
  59        struct video_device vdev;
  60        int io;
  61        int curvol;
  62        unsigned long curfreq;
  63        int stereo;
  64        struct mutex lock;
  65};
  66
  67static struct aztech aztech_card;
  68
  69static int volconvert(int level)
  70{
  71        level >>= 14;           /* Map 16bits down to 2 bit */
  72        level &= 3;
  73
  74        /* convert to card-friendly values */
  75        switch (level) {
  76        case 0:
  77                return 0;
  78        case 1:
  79                return 1;
  80        case 2:
  81                return 4;
  82        case 3:
  83                return 5;
  84        }
  85        return 0;       /* Quieten gcc */
  86}
  87
  88static void send_0_byte(struct aztech *az)
  89{
  90        udelay(radio_wait_time);
  91        outb_p(2 + volconvert(az->curvol), az->io);
  92        outb_p(64 + 2 + volconvert(az->curvol), az->io);
  93}
  94
  95static void send_1_byte(struct aztech *az)
  96{
  97        udelay (radio_wait_time);
  98        outb_p(128 + 2 + volconvert(az->curvol), az->io);
  99        outb_p(128 + 64 + 2 + volconvert(az->curvol), az->io);
 100}
 101
 102static int az_setvol(struct aztech *az, int vol)
 103{
 104        mutex_lock(&az->lock);
 105        outb(volconvert(vol), az->io);
 106        mutex_unlock(&az->lock);
 107        return 0;
 108}
 109
 110/* thanks to Michael Dwyer for giving me a dose of clues in
 111 * the signal strength department..
 112 *
 113 * This card has a stereo bit - bit 0 set = mono, not set = stereo
 114 * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 115 *
 116 */
 117
 118static int az_getsigstr(struct aztech *az)
 119{
 120        int sig = 1;
 121
 122        mutex_lock(&az->lock);
 123        if (inb(az->io) & 2)    /* bit set = no signal present */
 124                sig = 0;
 125        mutex_unlock(&az->lock);
 126        return sig;
 127}
 128
 129static int az_getstereo(struct aztech *az)
 130{
 131        int stereo = 1;
 132
 133        mutex_lock(&az->lock);
 134        if (inb(az->io) & 1)    /* bit set = mono */
 135                stereo = 0;
 136        mutex_unlock(&az->lock);
 137        return stereo;
 138}
 139
 140static int az_setfreq(struct aztech *az, unsigned long frequency)
 141{
 142        int  i;
 143
 144        mutex_lock(&az->lock);
 145
 146        az->curfreq = frequency;
 147        frequency += 171200;            /* Add 10.7 MHz IF              */
 148        frequency /= 800;               /* Convert to 50 kHz units      */
 149
 150        send_0_byte(az);                /*  0: LSB of frequency       */
 151
 152        for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)  */
 153                if (frequency & (1 << i))
 154                        send_1_byte(az);
 155                else
 156                        send_0_byte(az);
 157
 158        send_0_byte(az);                /* 14: test bit - always 0    */
 159        send_0_byte(az);                /* 15: test bit - always 0    */
 160        send_0_byte(az);                /* 16: band data 0 - always 0 */
 161        if (az->stereo)         /* 17: stereo (1 to enable)   */
 162                send_1_byte(az);
 163        else
 164                send_0_byte(az);
 165
 166        send_1_byte(az);                /* 18: band data 1 - unknown  */
 167        send_0_byte(az);                /* 19: time base - always 0   */
 168        send_0_byte(az);                /* 20: spacing (0 = 25 kHz)   */
 169        send_1_byte(az);                /* 21: spacing (1 = 25 kHz)   */
 170        send_0_byte(az);                /* 22: spacing (0 = 25 kHz)   */
 171        send_1_byte(az);                /* 23: AM/FM (FM = 1, always) */
 172
 173        /* latch frequency */
 174
 175        udelay(radio_wait_time);
 176        outb_p(128 + 64 + volconvert(az->curvol), az->io);
 177
 178        mutex_unlock(&az->lock);
 179
 180        return 0;
 181}
 182
 183static int vidioc_querycap(struct file *file, void  *priv,
 184                                        struct v4l2_capability *v)
 185{
 186        strlcpy(v->driver, "radio-aztech", sizeof(v->driver));
 187        strlcpy(v->card, "Aztech Radio", sizeof(v->card));
 188        strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 189        v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 190        return 0;
 191}
 192
 193static int vidioc_g_tuner(struct file *file, void *priv,
 194                                struct v4l2_tuner *v)
 195{
 196        struct aztech *az = video_drvdata(file);
 197
 198        if (v->index > 0)
 199                return -EINVAL;
 200
 201        strlcpy(v->name, "FM", sizeof(v->name));
 202        v->type = V4L2_TUNER_RADIO;
 203
 204        v->rangelow = 87 * 16000;
 205        v->rangehigh = 108 * 16000;
 206        v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 207        v->capability = V4L2_TUNER_CAP_LOW;
 208        if (az_getstereo(az))
 209                v->audmode = V4L2_TUNER_MODE_STEREO;
 210        else
 211                v->audmode = V4L2_TUNER_MODE_MONO;
 212        v->signal = 0xFFFF * az_getsigstr(az);
 213
 214        return 0;
 215}
 216
 217static int vidioc_s_tuner(struct file *file, void *priv,
 218                                struct v4l2_tuner *v)
 219{
 220        return v->index ? -EINVAL : 0;
 221}
 222
 223static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 224{
 225        *i = 0;
 226        return 0;
 227}
 228
 229static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 230{
 231        return i ? -EINVAL : 0;
 232}
 233
 234static int vidioc_g_audio(struct file *file, void *priv,
 235                           struct v4l2_audio *a)
 236{
 237        a->index = 0;
 238        strlcpy(a->name, "Radio", sizeof(a->name));
 239        a->capability = V4L2_AUDCAP_STEREO;
 240        return 0;
 241}
 242
 243static int vidioc_s_audio(struct file *file, void *priv,
 244                           struct v4l2_audio *a)
 245{
 246        return a->index ? -EINVAL : 0;
 247}
 248
 249static int vidioc_s_frequency(struct file *file, void *priv,
 250                                struct v4l2_frequency *f)
 251{
 252        struct aztech *az = video_drvdata(file);
 253
 254        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 255                return -EINVAL;
 256        az_setfreq(az, f->frequency);
 257        return 0;
 258}
 259
 260static int vidioc_g_frequency(struct file *file, void *priv,
 261                                struct v4l2_frequency *f)
 262{
 263        struct aztech *az = video_drvdata(file);
 264
 265        if (f->tuner != 0)
 266                return -EINVAL;
 267        f->type = V4L2_TUNER_RADIO;
 268        f->frequency = az->curfreq;
 269        return 0;
 270}
 271
 272static int vidioc_queryctrl(struct file *file, void *priv,
 273                            struct v4l2_queryctrl *qc)
 274{
 275        switch (qc->id) {
 276        case V4L2_CID_AUDIO_MUTE:
 277                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 278        case V4L2_CID_AUDIO_VOLUME:
 279                return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
 280        }
 281        return -EINVAL;
 282}
 283
 284static int vidioc_g_ctrl(struct file *file, void *priv,
 285                            struct v4l2_control *ctrl)
 286{
 287        struct aztech *az = video_drvdata(file);
 288
 289        switch (ctrl->id) {
 290        case V4L2_CID_AUDIO_MUTE:
 291                if (az->curvol == 0)
 292                        ctrl->value = 1;
 293                else
 294                        ctrl->value = 0;
 295                return 0;
 296        case V4L2_CID_AUDIO_VOLUME:
 297                ctrl->value = az->curvol * 6554;
 298                return 0;
 299        }
 300        return -EINVAL;
 301}
 302
 303static int vidioc_s_ctrl(struct file *file, void *priv,
 304                            struct v4l2_control *ctrl)
 305{
 306        struct aztech *az = video_drvdata(file);
 307
 308        switch (ctrl->id) {
 309        case V4L2_CID_AUDIO_MUTE:
 310                if (ctrl->value)
 311                        az_setvol(az, 0);
 312                else
 313                        az_setvol(az, az->curvol);
 314                return 0;
 315        case V4L2_CID_AUDIO_VOLUME:
 316                az_setvol(az, ctrl->value);
 317                return 0;
 318        }
 319        return -EINVAL;
 320}
 321
 322static const struct v4l2_file_operations aztech_fops = {
 323        .owner          = THIS_MODULE,
 324        .unlocked_ioctl = video_ioctl2,
 325};
 326
 327static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
 328        .vidioc_querycap    = vidioc_querycap,
 329        .vidioc_g_tuner     = vidioc_g_tuner,
 330        .vidioc_s_tuner     = vidioc_s_tuner,
 331        .vidioc_g_audio     = vidioc_g_audio,
 332        .vidioc_s_audio     = vidioc_s_audio,
 333        .vidioc_g_input     = vidioc_g_input,
 334        .vidioc_s_input     = vidioc_s_input,
 335        .vidioc_g_frequency = vidioc_g_frequency,
 336        .vidioc_s_frequency = vidioc_s_frequency,
 337        .vidioc_queryctrl   = vidioc_queryctrl,
 338        .vidioc_g_ctrl      = vidioc_g_ctrl,
 339        .vidioc_s_ctrl      = vidioc_s_ctrl,
 340};
 341
 342static int __init aztech_init(void)
 343{
 344        struct aztech *az = &aztech_card;
 345        struct v4l2_device *v4l2_dev = &az->v4l2_dev;
 346        int res;
 347
 348        strlcpy(v4l2_dev->name, "aztech", sizeof(v4l2_dev->name));
 349        az->io = io;
 350
 351        if (az->io == -1) {
 352                v4l2_err(v4l2_dev, "you must set an I/O address with io=0x350 or 0x358\n");
 353                return -EINVAL;
 354        }
 355
 356        if (!request_region(az->io, 2, "aztech")) {
 357                v4l2_err(v4l2_dev, "port 0x%x already in use\n", az->io);
 358                return -EBUSY;
 359        }
 360
 361        res = v4l2_device_register(NULL, v4l2_dev);
 362        if (res < 0) {
 363                release_region(az->io, 2);
 364                v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 365                return res;
 366        }
 367
 368        mutex_init(&az->lock);
 369        strlcpy(az->vdev.name, v4l2_dev->name, sizeof(az->vdev.name));
 370        az->vdev.v4l2_dev = v4l2_dev;
 371        az->vdev.fops = &aztech_fops;
 372        az->vdev.ioctl_ops = &aztech_ioctl_ops;
 373        az->vdev.release = video_device_release_empty;
 374        video_set_drvdata(&az->vdev, az);
 375        /* mute card - prevents noisy bootups */
 376        outb(0, az->io);
 377
 378        if (video_register_device(&az->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 379                v4l2_device_unregister(v4l2_dev);
 380                release_region(az->io, 2);
 381                return -EINVAL;
 382        }
 383
 384        v4l2_info(v4l2_dev, "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 385        return 0;
 386}
 387
 388static void __exit aztech_exit(void)
 389{
 390        struct aztech *az = &aztech_card;
 391
 392        video_unregister_device(&az->vdev);
 393        v4l2_device_unregister(&az->v4l2_dev);
 394        release_region(az->io, 2);
 395}
 396
 397module_init(aztech_init);
 398module_exit(aztech_exit);
 399