Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 | /* Typhoon Radio Card driver for radio support
* (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
*
* Card manufacturer:
* http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
*
* Notes on the hardware
*
* This card has two output sockets, one for speakers and one for line.
* The speaker output has volume control, but only in four discrete
* steps. The line output has neither volume control nor mute.
*
* The card has auto-stereo according to its manual, although it all
* sounds mono to me (even with the Win/DOS drivers). Maybe it's my
* antenna - I really don't know for sure.
*
* Frequency control is done digitally.
*
* Volume control is done digitally, but there are only four different
* possible values. So you should better always turn the volume up and
* use line control. I got the best results by connecting line output
* to the sound card microphone input. For such a configuration the
* volume control has no effect, since volume control only influences
* the speaker output.
*
* There is no explicit mute/unmute. So I set the radio frequency to a
* value where I do expect just noise and turn the speaker volume down.
* The frequency change is necessary since the card never seems to be
* completely silent.
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* check_region, request_region */
#include <linux/proc_fs.h> /* radio card status report */
#include <asm/io.h> /* outb, outb_p */
#include <asm/uaccess.h> /* copy to/from user */
#include <linux/videodev.h> /* kernel radio structs */
#include <linux/config.h> /* CONFIG_RADIO_TYPHOON_* */
#define BANNER "Typhoon Radio Card driver v0.1\n"
#ifndef CONFIG_RADIO_TYPHOON_PORT
#define CONFIG_RADIO_TYPHOON_PORT -1
#endif
#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
#endif
#ifndef CONFIG_PROC_FS
#undef CONFIG_RADIO_TYPHOON_PROC_FS
#endif
struct typhoon_device {
int users;
int iobase;
int curvol;
int muted;
unsigned long curfreq;
unsigned long mutefreq;
};
static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
static int typhoon_setfreq_generic(struct typhoon_device *dev,
unsigned long frequency);
static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
static void typhoon_mute(struct typhoon_device *dev);
static void typhoon_unmute(struct typhoon_device *dev);
static int typhoon_setvol(struct typhoon_device *dev, int vol);
static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg);
static int typhoon_open(struct video_device *dev, int flags);
static void typhoon_close(struct video_device *dev);
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
static int typhoon_read_proc(char *buf, char **start, off_t offset, int len,
int unused);
#endif
#ifdef MODULE
int init_module(void);
void cleanup_module(void);
int typhoon_init(struct video_init *v);
#else
int typhoon_init(struct video_init *v) __init;
#endif
static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
{
vol >>= 14; /* Map 16 bit to 2 bit */
vol &= 3;
outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
}
static int typhoon_setfreq_generic(struct typhoon_device *dev,
unsigned long frequency)
{
unsigned long outval;
unsigned long x;
/*
* The frequency transfer curve is not linear. The best fit I could
* get is
*
* outval = -155 + exp((f + 15.55) * 0.057))
*
* where frequency f is in MHz. Since we don't have exp in the kernel,
* I approximate this function by a third order polynomial.
*
*/
x = frequency / 160;
outval = (x * x + 2500) / 5000;
outval = (outval * x + 5000) / 10000;
outval -= (10 * x * x + 10433) / 20866;
outval += 4 * x - 11505;
outb_p((outval >> 8) & 0x01, dev->iobase + 4);
outb_p(outval >> 9, dev->iobase + 6);
outb_p(outval & 0xff, dev->iobase + 8);
return 0;
}
static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
{
typhoon_setfreq_generic(dev, frequency);
dev->curfreq = frequency;
return 0;
}
static void typhoon_mute(struct typhoon_device *dev)
{
if (dev->muted == 1)
return;
typhoon_setvol_generic(dev, 0);
typhoon_setfreq_generic(dev, dev->mutefreq);
dev->muted = 1;
}
static void typhoon_unmute(struct typhoon_device *dev)
{
if (dev->muted == 0)
return;
typhoon_setfreq_generic(dev, dev->curfreq);
typhoon_setvol_generic(dev, dev->curvol);
dev->muted = 0;
}
static int typhoon_setvol(struct typhoon_device *dev, int vol)
{
if (dev->muted && vol != 0) { /* user is unmuting the card */
dev->curvol = vol;
typhoon_unmute(dev);
return 0;
}
if (vol == dev->curvol) /* requested volume == current */
return 0;
if (vol == 0) { /* volume == 0 means mute the card */
typhoon_mute(dev);
dev->curvol = vol;
return 0;
}
typhoon_setvol_generic(dev, vol);
dev->curvol = vol;
return 0;
}
static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct typhoon_device *typhoon = dev->priv;
switch (cmd) {
case VIDIOCGCAP:
{
struct video_capability v;
v.type = VID_TYPE_TUNER;
v.channels = 1;
v.audios = 1;
/* No we don't do pictures */
v.maxwidth = 0;
v.maxheight = 0;
v.minwidth = 0;
v.minheight = 0;
strcpy(v.name, "Typhoon Radio");
if (copy_to_user(arg, &v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner v;
if (copy_from_user(&v, arg, sizeof(v)) != 0)
return -EFAULT;
if (v.tuner) /* Only 1 tuner */
return -EINVAL;
v.rangelow = 875 * 1600;
v.rangehigh = 1080 * 1600;
v.flags = VIDEO_TUNER_LOW;
v.mode = VIDEO_MODE_AUTO;
v.signal = 0xFFFF; /* We can't get the signal strength */
strcpy(v.name, "FM");
if (copy_to_user(arg, &v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner v;
if (copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if (v.tuner != 0)
return -EINVAL;
/* Only 1 tuner so no setting needed ! */
return 0;
}
case VIDIOCGFREQ:
if (copy_to_user(arg, &typhoon->curfreq,
sizeof(typhoon->curfreq)))
return -EFAULT;
return 0;
case VIDIOCSFREQ:
if (copy_from_user(&typhoon->curfreq, arg,
sizeof(typhoon->curfreq)))
return -EFAULT;
typhoon_setfreq(typhoon, typhoon->curfreq);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v, 0, sizeof(v));
v.flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
v.mode |= VIDEO_SOUND_MONO;
v.volume = typhoon->curvol;
v.step = 1 << 14;
strcpy(v.name, "Typhoon Radio");
if (copy_to_user(arg, &v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio v;
if (copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if (v.audio)
return -EINVAL;
if (v.flags & VIDEO_AUDIO_MUTE)
typhoon_mute(typhoon);
else
typhoon_unmute(typhoon);
if (v.flags & VIDEO_AUDIO_VOLUME)
typhoon_setvol(typhoon, v.volume);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int typhoon_open(struct video_device *dev, int flags)
{
struct typhoon_device *typhoon = dev->priv;
if (typhoon->users)
return -EBUSY;
typhoon->users++;
MOD_INC_USE_COUNT;
return 0;
}
static void typhoon_close(struct video_device *dev)
{
struct typhoon_device *typhoon = dev->priv;
typhoon->users--;
MOD_DEC_USE_COUNT;
}
static struct typhoon_device typhoon_unit =
{
0, /* users */
CONFIG_RADIO_TYPHOON_PORT, /* iobase */
0, /* curvol */
0, /* muted */
CONFIG_RADIO_TYPHOON_MUTEFREQ, /* curfreq */
CONFIG_RADIO_TYPHOON_MUTEFREQ /* mutefreq */
};
static struct video_device typhoon_radio =
{
"Typhoon Radio",
VID_TYPE_TUNER,
VID_HARDWARE_TYPHOON,
typhoon_open,
typhoon_close,
NULL, /* Can't read (no capture ability) */
NULL, /* Can't write */
NULL, /* Can't poll */
typhoon_ioctl,
NULL,
NULL
};
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
static int typhoon_read_proc(char *buf, char **start, off_t offset, int len,
int unused)
{
#ifdef MODULE
#define MODULEPROCSTRING "Driver loaded as a module"
#else
#define MODULEPROCSTRING "Driver compiled into kernel"
#endif
#define LIMIT (PAGE_SIZE - 80)
len = 0;
len += sprintf(buf + len, BANNER);
if (len > LIMIT) return len;
len += sprintf(buf + len, "Load type: " MODULEPROCSTRING "\n\n");
if (len > LIMIT) return len;
len += sprintf(buf + len, "frequency = %lu kHz\n",
typhoon_unit.curfreq >> 4);
if (len > LIMIT) return len;
len += sprintf(buf + len, "volume = %d\n", typhoon_unit.curvol);
if (len > LIMIT) return len;
len += sprintf(buf + len, "mute = %s\n", typhoon_unit.muted ?
"on" : "off");
if (len > LIMIT) return len;
len += sprintf(buf + len, "iobase = 0x%x\n", typhoon_unit.iobase);
if (len > LIMIT) return len;
len += sprintf(buf + len, "mute frequency = %lu kHz\n",
typhoon_unit.mutefreq >> 4);
return len;
}
static struct proc_dir_entry typhoon_proc_entry = {
0, /* low_ino: inode is dynamic */
13, "radio-typhoon", /* length of name and name */
S_IFREG | S_IRUGO, /* mode */
1, 0, 0, /* nlinks, owner, group */
0, /* size -- not used */
NULL, /* operations -- use default */
&typhoon_read_proc, /* function used to read data */
/* nothing more */
};
#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
int typhoon_init(struct video_init *v)
{
printk(KERN_INFO BANNER);
if (check_region(typhoon_unit.iobase, 8)) {
printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
typhoon_unit.iobase);
return -EBUSY;
}
typhoon_radio.priv = &typhoon_unit;
if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO) == -1)
return -EINVAL;
request_region(typhoon_unit.iobase, 8, "typhoon");
printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
typhoon_unit.mutefreq);
typhoon_unit.mutefreq <<= 4;
/* mute card - prevents noisy bootups */
typhoon_mute(&typhoon_unit);
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
if (proc_register(&proc_root, &typhoon_proc_entry))
printk(KERN_ERR "radio-typhoon: registering /proc/radio-typhoon failed\n");
#endif
return 0;
}
#ifdef MODULE
MODULE_AUTHOR("Dr. Henrik Seidel");
MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
MODULE_PARM(io, "i");
MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
MODULE_PARM(mutefreq, "i");
MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
EXPORT_NO_SYMBOLS;
static int io = -1;
static unsigned long mutefreq = 0;
int init_module(void)
{
if (io == -1) {
printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
return -EINVAL;
}
typhoon_unit.iobase = io;
if (mutefreq < 87000 || mutefreq > 108500) {
printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
return -EINVAL;
}
typhoon_unit.mutefreq = mutefreq;
return typhoon_init(NULL);
}
void cleanup_module(void)
{
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
if (proc_unregister(&proc_root, typhoon_proc_entry.low_ino))
printk(KERN_ERR "radio-typhoon: unregistering /proc/radio-typhoon failed\n");
#endif
video_unregister_device(&typhoon_radio);
release_region(io, 8);
}
#endif
|