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 az_do_ioctl(struct inode *inode, struct file *file,
 184                        unsigned int cmd, void *arg)
 185 {
 186         struct video_device *dev = video_devdata(file);
 187         struct az_device *az = dev->priv;
 188
 189         switch(cmd)
 190         {
 191                 case VIDIOC_QUERYCAP:
 192                 {
 193                         struct v4l2_capability *v = arg;
 194                         memset(v,0,sizeof(*v));
 195                         strlcpy(v->driver, "radio-aztech", sizeof (v->driver));
 196                         strlcpy(v->card, "Aztech Radio", sizeof (v->card));
 197                         sprintf(v->bus_info,"ISA");
 198                         v->version = RADIO_VERSION;
 199                         v->capabilities = V4L2_CAP_TUNER;
 200
 201                         return 0;
 202                 }
 203                 case VIDIOC_G_TUNER:
 204                 {
 205                         struct v4l2_tuner *v = arg;
 206
 207                         if (v->index > 0)
 208                                 return -EINVAL;
 209
 210                         memset(v,0,sizeof(*v));
 211                         strcpy(v->name, "FM");
 212                         v->type = V4L2_TUNER_RADIO;
 213
 214                         v->rangelow=(87*16000);
 215                         v->rangehigh=(108*16000);
 216                         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 217                         v->capability=V4L2_TUNER_CAP_LOW;
 218                         if(az_getstereo(az))
 219                                 v->audmode = V4L2_TUNER_MODE_STEREO;
 220                         else
 221                                 v->audmode = V4L2_TUNER_MODE_MONO;
 222                         v->signal=0xFFFF*az_getsigstr(az);
 223
 224                         return 0;
 225                 }
 226                 case VIDIOC_S_TUNER:
 227                 {
 228                         struct v4l2_tuner *v = arg;
 229
 230                         if (v->index > 0)
 231                                 return -EINVAL;
 232
 233                         return 0;
 234                 }
 235                 case VIDIOC_S_FREQUENCY:
 236                 {
 237                         struct v4l2_frequency *f = arg;
 238
 239                         az->curfreq = f->frequency;
 240                         az_setfreq(az, az->curfreq);
 241                         return 0;
 242                 }
 243                 case VIDIOC_G_FREQUENCY:
 244                 {
 245                         struct v4l2_frequency *f = arg;
 246
 247                         f->type = V4L2_TUNER_RADIO;
 248                         f->frequency = az->curfreq;
 249
 250                         return 0;
 251                 }
 252
 253                 case VIDIOC_QUERYCTRL:
 254                 {
 255                         struct v4l2_queryctrl *qc = arg;
 256                         int i;
 257
 258                         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 259                                 if (qc->id && qc->id == radio_qctrl[i].id) {
 260                                         memcpy(qc, &(radio_qctrl[i]),
 261                                                                 sizeof(*qc));
 262                                         return (0);
 263                                 }
 264                         }
 265                         return -EINVAL;
 266                 }
 267                 case VIDIOC_G_CTRL:
 268                 {
 269                         struct v4l2_control *ctrl= arg;
 270
 271                         switch (ctrl->id) {
 272                                 case V4L2_CID_AUDIO_MUTE:
 273                                         if (az->curvol==0)
 274                                                 ctrl->value=1;
 275                                         else
 276                                                 ctrl->value=0;
 277                                         return (0);
 278                                 case V4L2_CID_AUDIO_VOLUME:
 279                                         ctrl->value=az->curvol * 6554;
 280                                         return (0);
 281                         }
 282                         return -EINVAL;
 283                 }
 284                 case VIDIOC_S_CTRL:
 285                 {
 286                         struct v4l2_control *ctrl= arg;
 287
 288                         switch (ctrl->id) {
 289                                 case V4L2_CID_AUDIO_MUTE:
 290                                         if (ctrl->value) {
 291                                                 az_setvol(az,0);
 292                                         } else {
 293                                                 az_setvol(az,az->curvol);
 294                                         }
 295                                         return (0);
 296                                 case V4L2_CID_AUDIO_VOLUME:
 297                                         az_setvol(az,ctrl->value);
 298                                         return (0);
 299                         }
 300                         return -EINVAL;
 301                 }
 302
 303                 default:
 304                         return v4l_compat_translate_ioctl(inode,file,cmd,arg,
 305                                                           az_do_ioctl);
 306         }
 307 }
 308
 309 static int az_ioctl(struct inode *inode, struct file *file,
 310                     unsigned int cmd, unsigned long arg)
 311 {
 312         return video_usercopy(inode, file, cmd, arg, az_do_ioctl);
 313 }
 314
 315 static struct az_device aztech_unit;
 316
 317 static const struct file_operations aztech_fops = {
 318         .owner          = THIS_MODULE,
 319         .open           = video_exclusive_open,
 320         .release        = video_exclusive_release,
 321         .ioctl          = az_ioctl,
 322         .compat_ioctl   = v4l_compat_ioctl32,
 323         .llseek         = no_llseek,
 324 };
 325
 326 static struct video_device aztech_radio=
 327 {
 328         .owner          = THIS_MODULE,
 329         .name           = "Aztech radio",
 330         .type           = VID_TYPE_TUNER,
 331         .hardware       = 0,
 332         .fops           = &aztech_fops,
 333 };
 334
 335 static int __init aztech_init(void)
 336 {
 337         if(io==-1)
 338         {
 339                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 340                 return -EINVAL;
 341         }
 342
 343         if (!request_region(io, 2, "aztech"))
 344         {
 345                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 346                 return -EBUSY;
 347         }
 348
 349         mutex_init(&lock);
 350         aztech_radio.priv=&aztech_unit;
 351
 352         if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 353         {
 354                 release_region(io,2);
 355                 return -EINVAL;
 356         }
 357
 358         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 359         /* mute card - prevents noisy bootups */
 360         outb (0, io);
 361         return 0;
 362 }
 363
 364 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 365 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 366 MODULE_LICENSE("GPL");
 367
 368 module_param(io, int, 0);
 369 module_param(radio_nr, int, 0);
 370 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 371
 372 static void __exit aztech_cleanup(void)
 373 {
 374         video_unregister_device(&aztech_radio);
 375         release_region(io,2);
 376 }
 377
 378 module_init(aztech_init);
 379 module_exit(aztech_cleanup);