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 #include <media/v4l2-ioctl.h>
  37
  38 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  39 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  40
  41 static struct v4l2_queryctrl radio_qctrl[] = {
  42         {
  43                 .id            = V4L2_CID_AUDIO_MUTE,
  44                 .name          = "Mute",
  45                 .minimum       = 0,
  46                 .maximum       = 1,
  47                 .default_value = 1,
  48                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  49         },{
  50                 .id            = V4L2_CID_AUDIO_VOLUME,
  51                 .name          = "Volume",
  52                 .minimum       = 0,
  53                 .maximum       = 0xff,
  54                 .step          = 1,
  55                 .default_value = 0xff,
  56                 .type          = V4L2_CTRL_TYPE_INTEGER,
  57         }
  58 };
  59
  60 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  61
  62 #ifndef CONFIG_RADIO_AZTECH_PORT
  63 #define CONFIG_RADIO_AZTECH_PORT -1
  64 #endif
  65
  66 static int io = CONFIG_RADIO_AZTECH_PORT;
  67 static int radio_nr = -1;
  68 static int radio_wait_time = 1000;
  69 static struct mutex lock;
  70
  71 struct az_device
  72 {
  73         int curvol;
  74         unsigned long curfreq;
  75         int stereo;
  76 };
  77
  78 static int volconvert(int level)
  79 {
  80         level>>=14;             /* Map 16bits down to 2 bit */
  81         level&=3;
  82
  83         /* convert to card-friendly values */
  84         switch (level)
  85         {
  86                 case 0:
  87                         return 0;
  88                 case 1:
  89                         return 1;
  90                 case 2:
  91                         return 4;
  92                 case 3:
  93                         return 5;
  94         }
  95         return 0;       /* Quieten gcc */
  96 }
  97
  98 static void send_0_byte (struct az_device *dev)
  99 {
 100         udelay(radio_wait_time);
 101         outb_p(2+volconvert(dev->curvol), io);
 102         outb_p(64+2+volconvert(dev->curvol), io);
 103 }
 104
 105 static void send_1_byte (struct az_device *dev)
 106 {
 107         udelay (radio_wait_time);
 108         outb_p(128+2+volconvert(dev->curvol), io);
 109         outb_p(128+64+2+volconvert(dev->curvol), io);
 110 }
 111
 112 static int az_setvol(struct az_device *dev, int vol)
 113 {
 114         mutex_lock(&lock);
 115         outb (volconvert(vol), io);
 116         mutex_unlock(&lock);
 117         return 0;
 118 }
 119
 120 /* thanks to Michael Dwyer for giving me a dose of clues in
 121  * the signal strength department..
 122  *
 123  * This card has a stereo bit - bit 0 set = mono, not set = stereo
 124  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 125  *
 126  */
 127
 128 static int az_getsigstr(struct az_device *dev)
 129 {
 130         if (inb(io) & 2)        /* bit set = no signal present */
 131                 return 0;
 132         return 1;               /* signal present */
 133 }
 134
 135 static int az_getstereo(struct az_device *dev)
 136 {
 137         if (inb(io) & 1)        /* bit set = mono */
 138                 return 0;
 139         return 1;               /* stereo */
 140 }
 141
 142 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 143 {
 144         int  i;
 145
 146         frequency += 171200;            /* Add 10.7 MHz IF              */
 147         frequency /= 800;               /* Convert to 50 kHz units      */
 148
 149         mutex_lock(&lock);
 150
 151         send_0_byte (dev);              /*  0: LSB of frequency       */
 152
 153         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)  */
 154                 if (frequency & (1 << i))
 155                         send_1_byte (dev);
 156                 else
 157                         send_0_byte (dev);
 158
 159         send_0_byte (dev);              /* 14: test bit - always 0    */
 160         send_0_byte (dev);              /* 15: test bit - always 0    */
 161         send_0_byte (dev);              /* 16: band data 0 - always 0 */
 162         if (dev->stereo)                /* 17: stereo (1 to enable)   */
 163                 send_1_byte (dev);
 164         else
 165                 send_0_byte (dev);
 166
 167         send_1_byte (dev);              /* 18: band data 1 - unknown  */
 168         send_0_byte (dev);              /* 19: time base - always 0   */
 169         send_0_byte (dev);              /* 20: spacing (0 = 25 kHz)   */
 170         send_1_byte (dev);              /* 21: spacing (1 = 25 kHz)   */
 171         send_0_byte (dev);              /* 22: spacing (0 = 25 kHz)   */
 172         send_1_byte (dev);              /* 23: AM/FM (FM = 1, always) */
 173
 174         /* latch frequency */
 175
 176         udelay (radio_wait_time);
 177         outb_p(128+64+volconvert(dev->curvol), io);
 178
 179         mutex_unlock(&lock);
 180
 181         return 0;
 182 }
 183
 184 static int vidioc_querycap (struct file *file, void  *priv,
 185                                         struct v4l2_capability *v)
 186 {
 187         strlcpy(v->driver, "radio-aztech", sizeof (v->driver));
 188         strlcpy(v->card, "Aztech Radio", sizeof (v->card));
 189         sprintf(v->bus_info,"ISA");
 190         v->version = RADIO_VERSION;
 191         v->capabilities = V4L2_CAP_TUNER;
 192         return 0;
 193 }
 194
 195 static int vidioc_g_tuner (struct file *file, void *priv,
 196                                 struct v4l2_tuner *v)
 197 {
 198         struct video_device *dev = video_devdata(file);
 199         struct az_device *az = dev->priv;
 200
 201         if (v->index > 0)
 202                 return -EINVAL;
 203
 204         strcpy(v->name, "FM");
 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
 220
 221 static int vidioc_s_tuner (struct file *file, void *priv,
 222                                 struct v4l2_tuner *v)
 223 {
 224         if (v->index > 0)
 225                 return -EINVAL;
 226
 227         return 0;
 228 }
 229
 230 static int vidioc_g_audio (struct file *file, void *priv,
 231                            struct v4l2_audio *a)
 232 {
 233         if (a->index > 1)
 234                 return -EINVAL;
 235
 236         strcpy(a->name, "Radio");
 237         a->capability = V4L2_AUDCAP_STEREO;
 238         return 0;
 239 }
 240
 241 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 242 {
 243         *i = 0;
 244         return 0;
 245 }
 246
 247 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 248 {
 249         if (i != 0)
 250                 return -EINVAL;
 251         return 0;
 252 }
 253
 254
 255 static int vidioc_s_audio (struct file *file, void *priv,
 256                            struct v4l2_audio *a)
 257 {
 258         if (a->index != 0)
 259                 return -EINVAL;
 260
 261         return 0;
 262 }
 263
 264 static int vidioc_s_frequency (struct file *file, void *priv,
 265                                 struct v4l2_frequency *f)
 266 {
 267         struct video_device *dev = video_devdata(file);
 268         struct az_device *az = dev->priv;
 269
 270         az->curfreq = f->frequency;
 271         az_setfreq(az, az->curfreq);
 272         return 0;
 273 }
 274
 275 static int vidioc_g_frequency (struct file *file, void *priv,
 276                                 struct v4l2_frequency *f)
 277 {
 278         struct video_device *dev = video_devdata(file);
 279         struct az_device *az = dev->priv;
 280
 281         f->type = V4L2_TUNER_RADIO;
 282         f->frequency = az->curfreq;
 283
 284         return 0;
 285 }
 286
 287 static int vidioc_queryctrl (struct file *file, void *priv,
 288                             struct v4l2_queryctrl *qc)
 289 {
 290         int i;
 291
 292         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 293                 if (qc->id && qc->id == radio_qctrl[i].id) {
 294                         memcpy(qc, &(radio_qctrl[i]),
 295                                                 sizeof(*qc));
 296                         return (0);
 297                 }
 298         }
 299         return -EINVAL;
 300 }
 301
 302 static int vidioc_g_ctrl (struct file *file, void *priv,
 303                             struct v4l2_control *ctrl)
 304 {
 305         struct video_device *dev = video_devdata(file);
 306         struct az_device *az = dev->priv;
 307
 308         switch (ctrl->id) {
 309                 case V4L2_CID_AUDIO_MUTE:
 310                         if (az->curvol==0)
 311                                 ctrl->value=1;
 312                         else
 313                                 ctrl->value=0;
 314                         return (0);
 315                 case V4L2_CID_AUDIO_VOLUME:
 316                         ctrl->value=az->curvol * 6554;
 317                         return (0);
 318         }
 319         return -EINVAL;
 320 }
 321
 322 static int vidioc_s_ctrl (struct file *file, void *priv,
 323                             struct v4l2_control *ctrl)
 324 {
 325         struct video_device *dev = video_devdata(file);
 326         struct az_device *az = dev->priv;
 327
 328         switch (ctrl->id) {
 329                 case V4L2_CID_AUDIO_MUTE:
 330                         if (ctrl->value) {
 331                                 az_setvol(az,0);
 332                         } else {
 333                                 az_setvol(az,az->curvol);
 334                         }
 335                         return (0);
 336                 case V4L2_CID_AUDIO_VOLUME:
 337                         az_setvol(az,ctrl->value);
 338                         return (0);
 339         }
 340         return -EINVAL;
 341 }
 342
 343 static struct az_device aztech_unit;
 344
 345 static const struct file_operations aztech_fops = {
 346         .owner          = THIS_MODULE,
 347         .open           = video_exclusive_open,
 348         .release        = video_exclusive_release,
 349         .ioctl          = video_ioctl2,
 350 #ifdef CONFIG_COMPAT
 351         .compat_ioctl   = v4l_compat_ioctl32,
 352 #endif
 353         .llseek         = no_llseek,
 354 };
 355
 356 static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
 357         .vidioc_querycap    = vidioc_querycap,
 358         .vidioc_g_tuner     = vidioc_g_tuner,
 359         .vidioc_s_tuner     = vidioc_s_tuner,
 360         .vidioc_g_audio     = vidioc_g_audio,
 361         .vidioc_s_audio     = vidioc_s_audio,
 362         .vidioc_g_input     = vidioc_g_input,
 363         .vidioc_s_input     = vidioc_s_input,
 364         .vidioc_g_frequency = vidioc_g_frequency,
 365         .vidioc_s_frequency = vidioc_s_frequency,
 366         .vidioc_queryctrl   = vidioc_queryctrl,
 367         .vidioc_g_ctrl      = vidioc_g_ctrl,
 368         .vidioc_s_ctrl      = vidioc_s_ctrl,
 369 };
 370
 371 static struct video_device aztech_radio = {
 372         .name               = "Aztech radio",
 373         .fops               = &aztech_fops,
 374         .ioctl_ops          = &aztech_ioctl_ops,
 375 };
 376
 377 module_param_named(debug,aztech_radio.debug, int, 0644);
 378 MODULE_PARM_DESC(debug,"activates debug info");
 379
 380 static int __init aztech_init(void)
 381 {
 382         if(io==-1)
 383         {
 384                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 385                 return -EINVAL;
 386         }
 387
 388         if (!request_region(io, 2, "aztech"))
 389         {
 390                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 391                 return -EBUSY;
 392         }
 393
 394         mutex_init(&lock);
 395         aztech_radio.priv=&aztech_unit;
 396
 397         if (video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 398                 release_region(io,2);
 399                 return -EINVAL;
 400         }
 401
 402         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 403         /* mute card - prevents noisy bootups */
 404         outb (0, io);
 405         return 0;
 406 }
 407
 408 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 409 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 410 MODULE_LICENSE("GPL");
 411
 412 module_param(io, int, 0);
 413 module_param(radio_nr, int, 0);
 414 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 415
 416 static void __exit aztech_cleanup(void)
 417 {
 418         video_unregister_device(&aztech_radio);
 419         release_region(io,2);
 420 }
 421
 422 module_init(aztech_init);
 423 module_exit(aztech_cleanup);