1 /* Typhoon Radio Card driver for radio support 2 * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> 3 * 4 * Card manufacturer: 5 * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e 6 * 7 * Notes on the hardware 8 * 9 * This card has two output sockets, one for speakers and one for line. 10 * The speaker output has volume control, but only in four discrete 11 * steps. The line output has neither volume control nor mute. 12 * 13 * The card has auto-stereo according to its manual, although it all 14 * sounds mono to me (even with the Win/DOS drivers). Maybe it's my 15 * antenna - I really don't know for sure. 16 * 17 * Frequency control is done digitally. 18 * 19 * Volume control is done digitally, but there are only four different 20 * possible values. So you should better always turn the volume up and 21 * use line control. I got the best results by connecting line output 22 * to the sound card microphone input. For such a configuration the 23 * volume control has no effect, since volume control only influences 24 * the speaker output. 25 * 26 * There is no explicit mute/unmute. So I set the radio frequency to a 27 * value where I do expect just noise and turn the speaker volume down. 28 * The frequency change is necessary since the card never seems to be 29 * completely silent. 30 * 31 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> 32 */ 33 34 #include <linux/module.h> /* Modules */ 35 #include <linux/init.h> /* Initdata */ 36 #include <linux/ioport.h> /* request_region */ 37 #include <linux/proc_fs.h> /* radio card status report */ 38 #include <asm/io.h> /* outb, outb_p */ 39 #include <asm/uaccess.h> /* copy to/from user */ 40 #include <linux/videodev2.h> /* kernel radio structs */ 41 #include <media/v4l2-common.h> 42 43 #include <linux/version.h> /* for KERNEL_VERSION MACRO */ 44 #define RADIO_VERSION KERNEL_VERSION(0,1,1) 45 #define BANNER "Typhoon Radio Card driver v0.1.1\n" 46 47 static struct v4l2_queryctrl radio_qctrl[] = { 48 { 49 .id = V4L2_CID_AUDIO_MUTE, 50 .name = "Mute", 51 .minimum = 0, 52 .maximum = 1, 53 .default_value = 1, 54 .type = V4L2_CTRL_TYPE_BOOLEAN, 55 },{ 56 .id = V4L2_CID_AUDIO_VOLUME, 57 .name = "Volume", 58 .minimum = 0, 59 .maximum = 65535, 60 .step = 1<<14, 61 .default_value = 0xff, 62 .type = V4L2_CTRL_TYPE_INTEGER, 63 } 64 }; 65 66 67 #ifndef CONFIG_RADIO_TYPHOON_PORT 68 #define CONFIG_RADIO_TYPHOON_PORT -1 69 #endif 70 71 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 72 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 73 #endif 74 75 #ifndef CONFIG_PROC_FS 76 #undef CONFIG_RADIO_TYPHOON_PROC_FS 77 #endif 78 79 struct typhoon_device { 80 int users; 81 int iobase; 82 int curvol; 83 int muted; 84 unsigned long curfreq; 85 unsigned long mutefreq; 86 struct mutex lock; 87 }; 88 89 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); 90 static int typhoon_setfreq_generic(struct typhoon_device *dev, 91 unsigned long frequency); 92 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); 93 static void typhoon_mute(struct typhoon_device *dev); 94 static void typhoon_unmute(struct typhoon_device *dev); 95 static int typhoon_setvol(struct typhoon_device *dev, int vol); 96 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 97 static int typhoon_get_info(char *buf, char **start, off_t offset, int len); 98 #endif 99 100 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol) 101 { 102 mutex_lock(&dev->lock); 103 vol >>= 14; /* Map 16 bit to 2 bit */ 104 vol &= 3; 105 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ 106 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ 107 mutex_unlock(&dev->lock); 108 } 109 110 static int typhoon_setfreq_generic(struct typhoon_device *dev, 111 unsigned long frequency) 112 { 113 unsigned long outval; 114 unsigned long x; 115 116 /* 117 * The frequency transfer curve is not linear. The best fit I could 118 * get is 119 * 120 * outval = -155 + exp((f + 15.55) * 0.057)) 121 * 122 * where frequency f is in MHz. Since we don't have exp in the kernel, 123 * I approximate this function by a third order polynomial. 124 * 125 */ 126 127 mutex_lock(&dev->lock); 128 x = frequency / 160; 129 outval = (x * x + 2500) / 5000; 130 outval = (outval * x + 5000) / 10000; 131 outval -= (10 * x * x + 10433) / 20866; 132 outval += 4 * x - 11505; 133 134 outb_p((outval >> 8) & 0x01, dev->iobase + 4); 135 outb_p(outval >> 9, dev->iobase + 6); 136 outb_p(outval & 0xff, dev->iobase + 8); 137 mutex_unlock(&dev->lock); 138 139 return 0; 140 } 141 142 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) 143 { 144 typhoon_setfreq_generic(dev, frequency); 145 dev->curfreq = frequency; 146 return 0; 147 } 148 149 static void typhoon_mute(struct typhoon_device *dev) 150 { 151 if (dev->muted == 1) 152 return; 153 typhoon_setvol_generic(dev, 0); 154 typhoon_setfreq_generic(dev, dev->mutefreq); 155 dev->muted = 1; 156 } 157 158 static void typhoon_unmute(struct typhoon_device *dev) 159 { 160 if (dev->muted == 0) 161 return; 162 typhoon_setfreq_generic(dev, dev->curfreq); 163 typhoon_setvol_generic(dev, dev->curvol); 164 dev->muted = 0; 165 } 166 167 static int typhoon_setvol(struct typhoon_device *dev, int vol) 168 { 169 if (dev->muted && vol != 0) { /* user is unmuting the card */ 170 dev->curvol = vol; 171 typhoon_unmute(dev); 172 return 0; 173 } 174 if (vol == dev->curvol) /* requested volume == current */ 175 return 0; 176 177 if (vol == 0) { /* volume == 0 means mute the card */ 178 typhoon_mute(dev); 179 dev->curvol = vol; 180 return 0; 181 } 182 typhoon_setvol_generic(dev, vol); 183 dev->curvol = vol; 184 return 0; 185 } 186 187 static int vidioc_querycap(struct file *file, void *priv, 188 struct v4l2_capability *v) 189 { 190 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); 191 strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); 192 sprintf(v->bus_info, "ISA"); 193 v->version = RADIO_VERSION; 194 v->capabilities = V4L2_CAP_TUNER; 195 return 0; 196 } 197 198 static int vidioc_g_tuner(struct file *file, void *priv, 199 struct v4l2_tuner *v) 200 { 201 if (v->index > 0) 202 return -EINVAL; 203 204 strcpy(v->name, "FM"); 205 v->type = V4L2_TUNER_RADIO; 206 v->rangelow = (87.5*16000); 207 v->rangehigh = (108*16000); 208 v->rxsubchans = V4L2_TUNER_SUB_MONO; 209 v->capability = V4L2_TUNER_CAP_LOW; 210 v->audmode = V4L2_TUNER_MODE_MONO; 211 v->signal = 0xFFFF; /* We can't get the signal strength */ 212 return 0; 213 } 214 215 static int vidioc_s_tuner(struct file *file, void *priv, 216 struct v4l2_tuner *v) 217 { 218 if (v->index > 0) 219 return -EINVAL; 220 221 return 0; 222 } 223 224 static int vidioc_s_frequency(struct file *file, void *priv, 225 struct v4l2_frequency *f) 226 { 227 struct video_device *dev = video_devdata(file); 228 struct typhoon_device *typhoon = dev->priv; 229 230 typhoon->curfreq = f->frequency; 231 typhoon_setfreq(typhoon, typhoon->curfreq); 232 return 0; 233 } 234 235 static int vidioc_g_frequency(struct file *file, void *priv, 236 struct v4l2_frequency *f) 237 { 238 struct video_device *dev = video_devdata(file); 239 struct typhoon_device *typhoon = dev->priv; 240 241 f->type = V4L2_TUNER_RADIO; 242 f->frequency = typhoon->curfreq; 243 244 return 0; 245 } 246 247 static int vidioc_queryctrl(struct file *file, void *priv, 248 struct v4l2_queryctrl *qc) 249 { 250 int i; 251 252 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { 253 if (qc->id && qc->id == radio_qctrl[i].id) { 254 memcpy(qc, &(radio_qctrl[i]), 255 sizeof(*qc)); 256 return 0; 257 } 258 } 259 return -EINVAL; 260 } 261 262 static int vidioc_g_ctrl(struct file *file, void *priv, 263 struct v4l2_control *ctrl) 264 { 265 struct video_device *dev = video_devdata(file); 266 struct typhoon_device *typhoon = dev->priv; 267 268 switch (ctrl->id) { 269 case V4L2_CID_AUDIO_MUTE: 270 ctrl->value = typhoon->muted; 271 return 0; 272 case V4L2_CID_AUDIO_VOLUME: 273 ctrl->value = typhoon->curvol; 274 return 0; 275 } 276 return -EINVAL; 277 } 278 279 static int vidioc_s_ctrl (struct file *file, void *priv, 280 struct v4l2_control *ctrl) 281 { 282 struct video_device *dev = video_devdata(file); 283 struct typhoon_device *typhoon = dev->priv; 284 285 switch (ctrl->id) { 286 case V4L2_CID_AUDIO_MUTE: 287 if (ctrl->value) 288 typhoon_mute(typhoon); 289 else 290 typhoon_unmute(typhoon); 291 return 0; 292 case V4L2_CID_AUDIO_VOLUME: 293 typhoon_setvol(typhoon, ctrl->value); 294 return 0; 295 } 296 return -EINVAL; 297 } 298 299 static int vidioc_g_audio(struct file *file, void *priv, 300 struct v4l2_audio *a) 301 { 302 if (a->index > 1) 303 return -EINVAL; 304 305 strcpy(a->name, "Radio"); 306 a->capability = V4L2_AUDCAP_STEREO; 307 return 0; 308 } 309 310 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 311 { 312 *i = 0; 313 return 0; 314 } 315 316 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 317 { 318 if (i != 0) 319 return -EINVAL; 320 return 0; 321 } 322 323 static int vidioc_s_audio(struct file *file, void *priv, 324 struct v4l2_audio *a) 325 { 326 if (a->index != 0) 327 return -EINVAL; 328 return 0; 329 } 330 331 static struct typhoon_device typhoon_unit = 332 { 333 .iobase = CONFIG_RADIO_TYPHOON_PORT, 334 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 335 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 336 }; 337 338 static const struct file_operations typhoon_fops = { 339 .owner = THIS_MODULE, 340 .open = video_exclusive_open, 341 .release = video_exclusive_release, 342 .ioctl = video_ioctl2, 343 .compat_ioctl = v4l_compat_ioctl32, 344 .llseek = no_llseek, 345 }; 346 347 static struct video_device typhoon_radio = 348 { 349 .owner = THIS_MODULE, 350 .name = "Typhoon Radio", 351 .type = VID_TYPE_TUNER, 352 .fops = &typhoon_fops, 353 .vidioc_querycap = vidioc_querycap, 354 .vidioc_g_tuner = vidioc_g_tuner, 355 .vidioc_s_tuner = vidioc_s_tuner, 356 .vidioc_g_audio = vidioc_g_audio, 357 .vidioc_s_audio = vidioc_s_audio, 358 .vidioc_g_input = vidioc_g_input, 359 .vidioc_s_input = vidioc_s_input, 360 .vidioc_g_frequency = vidioc_g_frequency, 361 .vidioc_s_frequency = vidioc_s_frequency, 362 .vidioc_queryctrl = vidioc_queryctrl, 363 .vidioc_g_ctrl = vidioc_g_ctrl, 364 .vidioc_s_ctrl = vidioc_s_ctrl, 365 }; 366 367 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 368 369 static int typhoon_get_info(char *buf, char **start, off_t offset, int len) 370 { 371 char *out = buf; 372 373 #ifdef MODULE 374 #define MODULEPROCSTRING "Driver loaded as a module" 375 #else 376 #define MODULEPROCSTRING "Driver compiled into kernel" 377 #endif 378 379 /* output must be kept under PAGE_SIZE */ 380 out += sprintf(out, BANNER); 381 out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n"); 382 out += sprintf(out, "frequency = %lu kHz\n", 383 typhoon_unit.curfreq >> 4); 384 out += sprintf(out, "volume = %d\n", typhoon_unit.curvol); 385 out += sprintf(out, "mute = %s\n", typhoon_unit.muted ? 386 "on" : "off"); 387 out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase); 388 out += sprintf(out, "mute frequency = %lu kHz\n", 389 typhoon_unit.mutefreq >> 4); 390 return out - buf; 391 } 392 393 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ 394 395 MODULE_AUTHOR("Dr. Henrik Seidel"); 396 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 397 MODULE_LICENSE("GPL"); 398 399 static int io = -1; 400 static int radio_nr = -1; 401 402 module_param(io, int, 0); 403 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 404 module_param(radio_nr, int, 0); 405 406 #ifdef MODULE 407 static unsigned long mutefreq = 0; 408 module_param(mutefreq, ulong, 0); 409 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 410 #endif 411 412 static int __init typhoon_init(void) 413 { 414 #ifdef MODULE 415 if (io == -1) { 416 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); 417 return -EINVAL; 418 } 419 typhoon_unit.iobase = io; 420 421 if (mutefreq < 87000 || mutefreq > 108500) { 422 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); 423 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 424 return -EINVAL; 425 } 426 typhoon_unit.mutefreq = mutefreq; 427 #endif /* MODULE */ 428 429 printk(KERN_INFO BANNER); 430 mutex_init(&typhoon_unit.lock); 431 io = typhoon_unit.iobase; 432 if (!request_region(io, 8, "typhoon")) { 433 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", 434 typhoon_unit.iobase); 435 return -EBUSY; 436 } 437 438 typhoon_radio.priv = &typhoon_unit; 439 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1) 440 { 441 release_region(io, 8); 442 return -EINVAL; 443 } 444 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); 445 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", 446 typhoon_unit.mutefreq); 447 typhoon_unit.mutefreq <<= 4; 448 449 /* mute card - prevents noisy bootups */ 450 typhoon_mute(&typhoon_unit); 451 452 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 453 if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL, 454 typhoon_get_info)) 455 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); 456 #endif 457 458 return 0; 459 } 460 461 static void __exit typhoon_cleanup_module(void) 462 { 463 464 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 465 remove_proc_entry("driver/radio-typhoon", NULL); 466 #endif 467 468 video_unregister_device(&typhoon_radio); 469 release_region(io, 8); 470 } 471 472 module_init(typhoon_init); 473 module_exit(typhoon_cleanup_module); 474 475