drivers/media/radio/radio-aztech.c

   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 <asm/io.h>             /* outb, outb_p                 */
  33 #include <asm/uaccess.h>        /* copy to/from user            */
  34 #include <linux/videodev2.h>    /* kernel radio structs         */
  35 #include <media/v4l2-common.h>
  36
  37 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  38 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  39
  40 static struct v4l2_queryctrl radio_qctrl[] = {
  41         {
  42                 .id            = V4L2_CID_AUDIO_MUTE,
  43                 .name          = "Mute",
  44                 .minimum       = 0,
  45                 .maximum       = 1,
  46                 .default_value = 1,
  47                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  48         },{
  49                 .id            = V4L2_CID_AUDIO_VOLUME,
  50                 .name          = "Volume",
  51                 .minimum       = 0,
  52                 .maximum       = 0xff,
  53                 .step          = 1,
  54                 .default_value = 0xff,
  55                 .type          = V4L2_CTRL_TYPE_INTEGER,
  56         }
  57 };
  58
  59 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  60
  61 #ifndef CONFIG_RADIO_AZTECH_PORT
  62 #define CONFIG_RADIO_AZTECH_PORT -1
  63 #endif
  64
  65 static int io = CONFIG_RADIO_AZTECH_PORT;
  66 static int radio_nr = -1;
  67 static int radio_wait_time = 1000;
  68 static struct mutex lock;
  69
  70 struct az_device
  71 {
  72         int curvol;
  73         unsigned long curfreq;
  74         int stereo;
  75 };
  76
  77 static int volconvert(int level)
  78 {
  79         level>>=14;             /* Map 16bits down to 2 bit */
  80         level&=3;
  81
  82         /* convert to card-friendly values */
  83         switch (level)
  84         {
  85                 case 0:
  86                         return 0;
  87                 case 1:
  88                         return 1;
  89                 case 2:
  90                         return 4;
  91                 case 3:
  92                         return 5;
  93         }
  94         return 0;       /* Quieten gcc */
  95 }
  96
  97 static void send_0_byte (struct az_device *dev)
  98 {
  99         udelay(radio_wait_time);
 100         outb_p(2+volconvert(dev->curvol), io);
 101         outb_p(64+2+volconvert(dev->curvol), io);
 102 }
 103
 104 static void send_1_byte (struct az_device *dev)
 105 {
 106         udelay (radio_wait_time);
 107         outb_p(128+2+volconvert(dev->curvol), io);
 108         outb_p(128+64+2+volconvert(dev->curvol), io);
 109 }
 110
 111 static int az_setvol(struct az_device *dev, int vol)
 112 {
 113         mutex_lock(&lock);
 114         outb (volconvert(vol), io);
 115         mutex_unlock(&lock);
 116         return 0;
 117 }
 118
 119 /* thanks to Michael Dwyer for giving me a dose of clues in
 120  * the signal strength department..
 121  *
 122  * This card has a stereo bit - bit 0 set = mono, not set = stereo
 123  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 124  *
 125  */
 126
 127 static int az_getsigstr(struct az_device *dev)
 128 {
 129         if (inb(io) & 2)        /* bit set = no signal present */
 130                 return 0;
 131         return 1;               /* signal present */
 132 }
 133
 134 static int az_getstereo(struct az_device *dev)
 135 {
 136         if (inb(io) & 1)        /* bit set = mono */
 137                 return 0;
 138         return 1;               /* stereo */
 139 }
 140
 141 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 142 {
 143         int  i;
 144
 145         frequency += 171200;            /* Add 10.7 MHz IF              */
 146         frequency /= 800;               /* Convert to 50 kHz units      */
 147
 148         mutex_lock(&lock);
 149
 150         send_0_byte (dev);              /*  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 (dev);
 155                 else
 156                         send_0_byte (dev);
 157
 158         send_0_byte (dev);              /* 14: test bit - always 0    */
 159         send_0_byte (dev);              /* 15: test bit - always 0    */
 160         send_0_byte (dev);              /* 16: band data 0 - always 0 */
 161         if (dev->stereo)                /* 17: stereo (1 to enable)   */
 162                 send_1_byte (dev);
 163         else
 164                 send_0_byte (dev);
 165
 166         send_1_byte (dev);              /* 18: band data 1 - unknown  */
 167         send_0_byte (dev);              /* 19: time base - always 0   */
 168         send_0_byte (dev);              /* 20: spacing (0 = 25 kHz)   */
 169         send_1_byte (dev);              /* 21: spacing (1 = 25 kHz)   */
 170         send_0_byte (dev);              /* 22: spacing (0 = 25 kHz)   */
 171         send_1_byte (dev);              /* 23: AM/FM (FM = 1, always) */
 172
 173         /* latch frequency */
 174
 175         udelay (radio_wait_time);
 176         outb_p(128+64+volconvert(dev->curvol), io);
 177
 178         mutex_unlock(&lock);
 179
 180         return 0;
 181 }
 182
 183 static 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         sprintf(v->bus_info,"ISA");
 189         v->version = RADIO_VERSION;
 190         v->capabilities = V4L2_CAP_TUNER;
 191         return 0;
 192 }
 193
 194 static int vidioc_g_tuner (struct file *file, void *priv,
 195                                 struct v4l2_tuner *v)
 196 {
 197         struct video_device *dev = video_devdata(file);
 198         struct az_device *az = dev->priv;
 199
 200         if (v->index > 0)
 201                 return -EINVAL;
 202
 203         strcpy(v->name, "FM");
 204         v->type = V4L2_TUNER_RADIO;
 205
 206         v->rangelow=(87*16000);
 207         v->rangehigh=(108*16000);
 208         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 209         v->capability=V4L2_TUNER_CAP_LOW;
 210         if(az_getstereo(az))
 211                 v->audmode = V4L2_TUNER_MODE_STEREO;
 212         else
 213                 v->audmode = V4L2_TUNER_MODE_MONO;
 214         v->signal=0xFFFF*az_getsigstr(az);
 215
 216         return 0;
 217 }
 218
 219
 220 static int vidioc_s_tuner (struct file *file, void *priv,
 221                                 struct v4l2_tuner *v)
 222 {
 223         if (v->index > 0)
 224                 return -EINVAL;
 225
 226         return 0;
 227 }
 228
 229 static int vidioc_g_audio (struct file *file, void *priv,
 230                            struct v4l2_audio *a)
 231 {
 232         if (a->index > 1)
 233                 return -EINVAL;
 234
 235         strcpy(a->name, "Radio");
 236         a->capability = V4L2_AUDCAP_STEREO;
 237         return 0;
 238 }
 239
 240 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 241 {
 242         *i = 0;
 243         return 0;
 244 }
 245
 246 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 247 {
 248         if (i != 0)
 249                 return -EINVAL;
 250         return 0;
 251 }
 252
 253
 254 static int vidioc_s_audio (struct file *file, void *priv,
 255                            struct v4l2_audio *a)
 256 {
 257         if (a->index != 0)
 258                 return -EINVAL;
 259
 260         return 0;
 261 }
 262
 263 static int vidioc_s_frequency (struct file *file, void *priv,
 264                                 struct v4l2_frequency *f)
 265 {
 266         struct video_device *dev = video_devdata(file);
 267         struct az_device *az = dev->priv;
 268
 269         az->curfreq = f->frequency;
 270         az_setfreq(az, az->curfreq);
 271         return 0;
 272 }
 273
 274 static int vidioc_g_frequency (struct file *file, void *priv,
 275                                 struct v4l2_frequency *f)
 276 {
 277         struct video_device *dev = video_devdata(file);
 278         struct az_device *az = dev->priv;
 279
 280         f->type = V4L2_TUNER_RADIO;
 281         f->frequency = az->curfreq;
 282
 283         return 0;
 284 }
 285
 286 static int vidioc_queryctrl (struct file *file, void *priv,
 287                             struct v4l2_queryctrl *qc)
 288 {
 289         int i;
 290
 291         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 292                 if (qc->id && qc->id == radio_qctrl[i].id) {
 293                         memcpy(qc, &(radio_qctrl[i]),
 294                                                 sizeof(*qc));
 295                         return (0);
 296                 }
 297         }
 298         return -EINVAL;
 299 }
 300
 301 static int vidioc_g_ctrl (struct file *file, void *priv,
 302                             struct v4l2_control *ctrl)
 303 {
 304         struct video_device *dev = video_devdata(file);
 305         struct az_device *az = dev->priv;
 306
 307         switch (ctrl->id) {
 308                 case V4L2_CID_AUDIO_MUTE:
 309                         if (az->curvol==0)
 310                                 ctrl->value=1;
 311                         else
 312                                 ctrl->value=0;
 313                         return (0);
 314                 case V4L2_CID_AUDIO_VOLUME:
 315                         ctrl->value=az->curvol * 6554;
 316                         return (0);
 317         }
 318         return -EINVAL;
 319 }
 320
 321 static int vidioc_s_ctrl (struct file *file, void *priv,
 322                             struct v4l2_control *ctrl)
 323 {
 324         struct video_device *dev = video_devdata(file);
 325         struct az_device *az = dev->priv;
 326
 327         switch (ctrl->id) {
 328                 case V4L2_CID_AUDIO_MUTE:
 329                         if (ctrl->value) {
 330                                 az_setvol(az,0);
 331                         } else {
 332                                 az_setvol(az,az->curvol);
 333                         }
 334                         return (0);
 335                 case V4L2_CID_AUDIO_VOLUME:
 336                         az_setvol(az,ctrl->value);
 337                         return (0);
 338         }
 339         return -EINVAL;
 340 }
 341
 342 static struct az_device aztech_unit;
 343
 344 static const struct file_operations aztech_fops = {
 345         .owner          = THIS_MODULE,
 346         .open           = video_exclusive_open,
 347         .release        = video_exclusive_release,
 348         .ioctl          = video_ioctl2,
 349         .compat_ioctl   = v4l_compat_ioctl32,
 350         .llseek         = no_llseek,
 351 };
 352
 353 static struct video_device aztech_radio=
 354 {
 355         .owner              = THIS_MODULE,
 356         .name               = "Aztech radio",
 357         .type               = VID_TYPE_TUNER,
 358         .hardware           = 0,
 359         .fops               = &aztech_fops,
 360         .vidioc_querycap    = vidioc_querycap,
 361         .vidioc_g_tuner     = vidioc_g_tuner,
 362         .vidioc_s_tuner     = vidioc_s_tuner,
 363         .vidioc_g_audio     = vidioc_g_audio,
 364         .vidioc_s_audio     = vidioc_s_audio,
 365         .vidioc_g_input     = vidioc_g_input,
 366         .vidioc_s_input     = vidioc_s_input,
 367         .vidioc_g_frequency = vidioc_g_frequency,
 368         .vidioc_s_frequency = vidioc_s_frequency,
 369         .vidioc_queryctrl   = vidioc_queryctrl,
 370         .vidioc_g_ctrl      = vidioc_g_ctrl,
 371         .vidioc_s_ctrl      = vidioc_s_ctrl,
 372 };
 373
 374 module_param_named(debug,aztech_radio.debug, int, 0644);
 375 MODULE_PARM_DESC(debug,"activates debug info");
 376
 377 static int __init aztech_init(void)
 378 {
 379         if(io==-1)
 380         {
 381                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 382                 return -EINVAL;
 383         }
 384
 385         if (!request_region(io, 2, "aztech"))
 386         {
 387                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 388                 return -EBUSY;
 389         }
 390
 391         mutex_init(&lock);
 392         aztech_radio.priv=&aztech_unit;
 393
 394         if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 395         {
 396                 release_region(io,2);
 397                 return -EINVAL;
 398         }
 399
 400         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 401         /* mute card - prevents noisy bootups */
 402         outb (0, io);
 403         return 0;
 404 }
 405
 406 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 407 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 408 MODULE_LICENSE("GPL");
 409
 410 module_param(io, int, 0);
 411 module_param(radio_nr, int, 0);
 412 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 413
 414 static void __exit aztech_cleanup(void)
 415 {
 416         video_unregister_device(&aztech_radio);
 417         release_region(io,2);
 418 }
 419
 420 module_init(aztech_init);
 421 module_exit(aztech_cleanup);