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         unsigned long in_use;
  74         int curvol;
  75         unsigned long curfreq;
  76         int stereo;
  77 };
  78
  79 static int volconvert(int level)
  80 {
  81         level>>=14;             /* Map 16bits down to 2 bit */
  82         level&=3;
  83
  84         /* convert to card-friendly values */
  85         switch (level)
  86         {
  87                 case 0:
  88                         return 0;
  89                 case 1:
  90                         return 1;
  91                 case 2:
  92                         return 4;
  93                 case 3:
  94                         return 5;
  95         }
  96         return 0;       /* Quieten gcc */
  97 }
  98
  99 static void send_0_byte (struct az_device *dev)
 100 {
 101         udelay(radio_wait_time);
 102         outb_p(2+volconvert(dev->curvol), io);
 103         outb_p(64+2+volconvert(dev->curvol), io);
 104 }
 105
 106 static void send_1_byte (struct az_device *dev)
 107 {
 108         udelay (radio_wait_time);
 109         outb_p(128+2+volconvert(dev->curvol), io);
 110         outb_p(128+64+2+volconvert(dev->curvol), io);
 111 }
 112
 113 static int az_setvol(struct az_device *dev, int vol)
 114 {
 115         mutex_lock(&lock);
 116         outb (volconvert(vol), io);
 117         mutex_unlock(&lock);
 118         return 0;
 119 }
 120
 121 /* thanks to Michael Dwyer for giving me a dose of clues in
 122  * the signal strength department..
 123  *
 124  * This card has a stereo bit - bit 0 set = mono, not set = stereo
 125  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 126  *
 127  */
 128
 129 static int az_getsigstr(struct az_device *dev)
 130 {
 131         if (inb(io) & 2)        /* bit set = no signal present */
 132                 return 0;
 133         return 1;               /* signal present */
 134 }
 135
 136 static int az_getstereo(struct az_device *dev)
 137 {
 138         if (inb(io) & 1)        /* bit set = mono */
 139                 return 0;
 140         return 1;               /* stereo */
 141 }
 142
 143 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 144 {
 145         int  i;
 146
 147         frequency += 171200;            /* Add 10.7 MHz IF              */
 148         frequency /= 800;               /* Convert to 50 kHz units      */
 149
 150         mutex_lock(&lock);
 151
 152         send_0_byte (dev);              /*  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 (dev);
 157                 else
 158                         send_0_byte (dev);
 159
 160         send_0_byte (dev);              /* 14: test bit - always 0    */
 161         send_0_byte (dev);              /* 15: test bit - always 0    */
 162         send_0_byte (dev);              /* 16: band data 0 - always 0 */
 163         if (dev->stereo)                /* 17: stereo (1 to enable)   */
 164                 send_1_byte (dev);
 165         else
 166                 send_0_byte (dev);
 167
 168         send_1_byte (dev);              /* 18: band data 1 - unknown  */
 169         send_0_byte (dev);              /* 19: time base - always 0   */
 170         send_0_byte (dev);              /* 20: spacing (0 = 25 kHz)   */
 171         send_1_byte (dev);              /* 21: spacing (1 = 25 kHz)   */
 172         send_0_byte (dev);              /* 22: spacing (0 = 25 kHz)   */
 173         send_1_byte (dev);              /* 23: AM/FM (FM = 1, always) */
 174
 175         /* latch frequency */
 176
 177         udelay (radio_wait_time);
 178         outb_p(128+64+volconvert(dev->curvol), io);
 179
 180         mutex_unlock(&lock);
 181
 182         return 0;
 183 }
 184
 185 static 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         sprintf(v->bus_info,"ISA");
 191         v->version = RADIO_VERSION;
 192         v->capabilities = V4L2_CAP_TUNER;
 193         return 0;
 194 }
 195
 196 static int vidioc_g_tuner (struct file *file, void *priv,
 197                                 struct v4l2_tuner *v)
 198 {
 199         struct az_device *az = video_drvdata(file);
 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 az_device *az = video_drvdata(file);
 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 az_device *az = video_drvdata(file);
 278
 279         f->type = V4L2_TUNER_RADIO;
 280         f->frequency = az->curfreq;
 281
 282         return 0;
 283 }
 284
 285 static int vidioc_queryctrl (struct file *file, void *priv,
 286                             struct v4l2_queryctrl *qc)
 287 {
 288         int i;
 289
 290         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 291                 if (qc->id && qc->id == radio_qctrl[i].id) {
 292                         memcpy(qc, &(radio_qctrl[i]),
 293                                                 sizeof(*qc));
 294                         return (0);
 295                 }
 296         }
 297         return -EINVAL;
 298 }
 299
 300 static int vidioc_g_ctrl (struct file *file, void *priv,
 301                             struct v4l2_control *ctrl)
 302 {
 303         struct az_device *az = video_drvdata(file);
 304
 305         switch (ctrl->id) {
 306                 case V4L2_CID_AUDIO_MUTE:
 307                         if (az->curvol==0)
 308                                 ctrl->value=1;
 309                         else
 310                                 ctrl->value=0;
 311                         return (0);
 312                 case V4L2_CID_AUDIO_VOLUME:
 313                         ctrl->value=az->curvol * 6554;
 314                         return (0);
 315         }
 316         return -EINVAL;
 317 }
 318
 319 static int vidioc_s_ctrl (struct file *file, void *priv,
 320                             struct v4l2_control *ctrl)
 321 {
 322         struct az_device *az = video_drvdata(file);
 323
 324         switch (ctrl->id) {
 325                 case V4L2_CID_AUDIO_MUTE:
 326                         if (ctrl->value) {
 327                                 az_setvol(az,0);
 328                         } else {
 329                                 az_setvol(az,az->curvol);
 330                         }
 331                         return (0);
 332                 case V4L2_CID_AUDIO_VOLUME:
 333                         az_setvol(az,ctrl->value);
 334                         return (0);
 335         }
 336         return -EINVAL;
 337 }
 338
 339 static struct az_device aztech_unit;
 340
 341 static int aztech_exclusive_open(struct file *file)
 342 {
 343         return test_and_set_bit(0, &aztech_unit.in_use) ? -EBUSY : 0;
 344 }
 345
 346 static int aztech_exclusive_release(struct file *file)
 347 {
 348         clear_bit(0, &aztech_unit.in_use);
 349         return 0;
 350 }
 351
 352 static const struct v4l2_file_operations aztech_fops = {
 353         .owner          = THIS_MODULE,
 354         .open           = aztech_exclusive_open,
 355         .release        = aztech_exclusive_release,
 356         .ioctl          = video_ioctl2,
 357 };
 358
 359 static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
 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 static struct video_device aztech_radio = {
 375         .name           = "Aztech radio",
 376         .fops           = &aztech_fops,
 377         .ioctl_ops      = &aztech_ioctl_ops,
 378         .release        = video_device_release_empty,
 379 };
 380
 381 module_param_named(debug,aztech_radio.debug, int, 0644);
 382 MODULE_PARM_DESC(debug,"activates debug info");
 383
 384 static int __init aztech_init(void)
 385 {
 386         if(io==-1)
 387         {
 388                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 389                 return -EINVAL;
 390         }
 391
 392         if (!request_region(io, 2, "aztech"))
 393         {
 394                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 395                 return -EBUSY;
 396         }
 397
 398         mutex_init(&lock);
 399         video_set_drvdata(&aztech_radio, &aztech_unit);
 400
 401         if (video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 402                 release_region(io,2);
 403                 return -EINVAL;
 404         }
 405
 406         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 407         /* mute card - prevents noisy bootups */
 408         outb (0, io);
 409         return 0;
 410 }
 411
 412 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 413 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 414 MODULE_LICENSE("GPL");
 415
 416 module_param(io, int, 0);
 417 module_param(radio_nr, int, 0);
 418 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 419
 420 static void __exit aztech_cleanup(void)
 421 {
 422         video_unregister_device(&aztech_radio);
 423         release_region(io,2);
 424 }
 425
 426 module_init(aztech_init);
 427 module_exit(aztech_cleanup);