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 <linux/seq_file.h> 39 #include <asm/io.h> /* outb, outb_p */ 40 #include <asm/uaccess.h> /* copy to/from user */ 41 #include <linux/videodev2.h> /* kernel radio structs */ 42 #include <media/v4l2-common.h> 43 #include <media/v4l2-ioctl.h> 44 45 #include <linux/version.h> /* for KERNEL_VERSION MACRO */ 46 #define RADIO_VERSION KERNEL_VERSION(0,1,1) 47 #define BANNER "Typhoon Radio Card driver v0.1.1\n" 48 49 static struct v4l2_queryctrl radio_qctrl[] = { 50 { 51 .id = V4L2_CID_AUDIO_MUTE, 52 .name = "Mute", 53 .minimum = 0, 54 .maximum = 1, 55 .default_value = 1, 56 .type = V4L2_CTRL_TYPE_BOOLEAN, 57 },{ 58 .id = V4L2_CID_AUDIO_VOLUME, 59 .name = "Volume", 60 .minimum = 0, 61 .maximum = 65535, 62 .step = 1<<14, 63 .default_value = 0xff, 64 .type = V4L2_CTRL_TYPE_INTEGER, 65 } 66 }; 67 68 69 #ifndef CONFIG_RADIO_TYPHOON_PORT 70 #define CONFIG_RADIO_TYPHOON_PORT -1 71 #endif 72 73 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 74 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 75 #endif 76 77 #ifndef CONFIG_PROC_FS 78 #undef CONFIG_RADIO_TYPHOON_PROC_FS 79 #endif 80 81 struct typhoon_device { 82 int users; 83 int iobase; 84 int curvol; 85 int muted; 86 unsigned long curfreq; 87 unsigned long mutefreq; 88 struct mutex lock; 89 }; 90 91 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); 92 static int typhoon_setfreq_generic(struct typhoon_device *dev, 93 unsigned long frequency); 94 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); 95 static void typhoon_mute(struct typhoon_device *dev); 96 static void typhoon_unmute(struct typhoon_device *dev); 97 static int typhoon_setvol(struct typhoon_device *dev, int vol); 98 99 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol) 100 { 101 mutex_lock(&dev->lock); 102 vol >>= 14; /* Map 16 bit to 2 bit */ 103 vol &= 3; 104 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ 105 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ 106 mutex_unlock(&dev->lock); 107 } 108 109 static int typhoon_setfreq_generic(struct typhoon_device *dev, 110 unsigned long frequency) 111 { 112 unsigned long outval; 113 unsigned long x; 114 115 /* 116 * The frequency transfer curve is not linear. The best fit I could 117 * get is 118 * 119 * outval = -155 + exp((f + 15.55) * 0.057)) 120 * 121 * where frequency f is in MHz. Since we don't have exp in the kernel, 122 * I approximate this function by a third order polynomial. 123 * 124 */ 125 126 mutex_lock(&dev->lock); 127 x = frequency / 160; 128 outval = (x * x + 2500) / 5000; 129 outval = (outval * x + 5000) / 10000; 130 outval -= (10 * x * x + 10433) / 20866; 131 outval += 4 * x - 11505; 132 133 outb_p((outval >> 8) & 0x01, dev->iobase + 4); 134 outb_p(outval >> 9, dev->iobase + 6); 135 outb_p(outval & 0xff, dev->iobase + 8); 136 mutex_unlock(&dev->lock); 137 138 return 0; 139 } 140 141 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) 142 { 143 typhoon_setfreq_generic(dev, frequency); 144 dev->curfreq = frequency; 145 return 0; 146 } 147 148 static void typhoon_mute(struct typhoon_device *dev) 149 { 150 if (dev->muted == 1) 151 return; 152 typhoon_setvol_generic(dev, 0); 153 typhoon_setfreq_generic(dev, dev->mutefreq); 154 dev->muted = 1; 155 } 156 157 static void typhoon_unmute(struct typhoon_device *dev) 158 { 159 if (dev->muted == 0) 160 return; 161 typhoon_setfreq_generic(dev, dev->curfreq); 162 typhoon_setvol_generic(dev, dev->curvol); 163 dev->muted = 0; 164 } 165 166 static int typhoon_setvol(struct typhoon_device *dev, int vol) 167 { 168 if (dev->muted && vol != 0) { /* user is unmuting the card */ 169 dev->curvol = vol; 170 typhoon_unmute(dev); 171 return 0; 172 } 173 if (vol == dev->curvol) /* requested volume == current */ 174 return 0; 175 176 if (vol == 0) { /* volume == 0 means mute the card */ 177 typhoon_mute(dev); 178 dev->curvol = vol; 179 return 0; 180 } 181 typhoon_setvol_generic(dev, vol); 182 dev->curvol = vol; 183 return 0; 184 } 185 186 static int vidioc_querycap(struct file *file, void *priv, 187 struct v4l2_capability *v) 188 { 189 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); 190 strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); 191 sprintf(v->bus_info, "ISA"); 192 v->version = RADIO_VERSION; 193 v->capabilities = V4L2_CAP_TUNER; 194 return 0; 195 } 196 197 static int vidioc_g_tuner(struct file *file, void *priv, 198 struct v4l2_tuner *v) 199 { 200 if (v->index > 0) 201 return -EINVAL; 202 203 strcpy(v->name, "FM"); 204 v->type = V4L2_TUNER_RADIO; 205 v->rangelow = (87.5*16000); 206 v->rangehigh = (108*16000); 207 v->rxsubchans = V4L2_TUNER_SUB_MONO; 208 v->capability = V4L2_TUNER_CAP_LOW; 209 v->audmode = V4L2_TUNER_MODE_MONO; 210 v->signal = 0xFFFF; /* We can't get the signal strength */ 211 return 0; 212 } 213 214 static int vidioc_s_tuner(struct file *file, void *priv, 215 struct v4l2_tuner *v) 216 { 217 if (v->index > 0) 218 return -EINVAL; 219 220 return 0; 221 } 222 223 static int vidioc_s_frequency(struct file *file, void *priv, 224 struct v4l2_frequency *f) 225 { 226 struct video_device *dev = video_devdata(file); 227 struct typhoon_device *typhoon = dev->priv; 228 229 typhoon->curfreq = f->frequency; 230 typhoon_setfreq(typhoon, typhoon->curfreq); 231 return 0; 232 } 233 234 static int vidioc_g_frequency(struct file *file, void *priv, 235 struct v4l2_frequency *f) 236 { 237 struct video_device *dev = video_devdata(file); 238 struct typhoon_device *typhoon = dev->priv; 239 240 f->type = V4L2_TUNER_RADIO; 241 f->frequency = typhoon->curfreq; 242 243 return 0; 244 } 245 246 static int vidioc_queryctrl(struct file *file, void *priv, 247 struct v4l2_queryctrl *qc) 248 { 249 int i; 250 251 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { 252 if (qc->id && qc->id == radio_qctrl[i].id) { 253 memcpy(qc, &(radio_qctrl[i]), 254 sizeof(*qc)); 255 return 0; 256 } 257 } 258 return -EINVAL; 259 } 260 261 static int vidioc_g_ctrl(struct file *file, void *priv, 262 struct v4l2_control *ctrl) 263 { 264 struct video_device *dev = video_devdata(file); 265 struct typhoon_device *typhoon = dev->priv; 266 267 switch (ctrl->id) { 268 case V4L2_CID_AUDIO_MUTE: 269 ctrl->value = typhoon->muted; 270 return 0; 271 case V4L2_CID_AUDIO_VOLUME: 272 ctrl->value = typhoon->curvol; 273 return 0; 274 } 275 return -EINVAL; 276 } 277 278 static int vidioc_s_ctrl (struct file *file, void *priv, 279 struct v4l2_control *ctrl) 280 { 281 struct video_device *dev = video_devdata(file); 282 struct typhoon_device *typhoon = dev->priv; 283 284 switch (ctrl->id) { 285 case V4L2_CID_AUDIO_MUTE: 286 if (ctrl->value) 287 typhoon_mute(typhoon); 288 else 289 typhoon_unmute(typhoon); 290 return 0; 291 case V4L2_CID_AUDIO_VOLUME: 292 typhoon_setvol(typhoon, ctrl->value); 293 return 0; 294 } 295 return -EINVAL; 296 } 297 298 static int vidioc_g_audio(struct file *file, void *priv, 299 struct v4l2_audio *a) 300 { 301 if (a->index > 1) 302 return -EINVAL; 303 304 strcpy(a->name, "Radio"); 305 a->capability = V4L2_AUDCAP_STEREO; 306 return 0; 307 } 308 309 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 310 { 311 *i = 0; 312 return 0; 313 } 314 315 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 316 { 317 if (i != 0) 318 return -EINVAL; 319 return 0; 320 } 321 322 static int vidioc_s_audio(struct file *file, void *priv, 323 struct v4l2_audio *a) 324 { 325 if (a->index != 0) 326 return -EINVAL; 327 return 0; 328 } 329 330 static struct typhoon_device typhoon_unit = 331 { 332 .iobase = CONFIG_RADIO_TYPHOON_PORT, 333 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 334 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 335 }; 336 337 static const struct file_operations typhoon_fops = { 338 .owner = THIS_MODULE, 339 .open = video_exclusive_open, 340 .release = video_exclusive_release, 341 .ioctl = video_ioctl2, 342 #ifdef CONFIG_COMPAT 343 .compat_ioctl = v4l_compat_ioctl32, 344 #endif 345 .llseek = no_llseek, 346 }; 347 348 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { 349 .vidioc_querycap = vidioc_querycap, 350 .vidioc_g_tuner = vidioc_g_tuner, 351 .vidioc_s_tuner = vidioc_s_tuner, 352 .vidioc_g_audio = vidioc_g_audio, 353 .vidioc_s_audio = vidioc_s_audio, 354 .vidioc_g_input = vidioc_g_input, 355 .vidioc_s_input = vidioc_s_input, 356 .vidioc_g_frequency = vidioc_g_frequency, 357 .vidioc_s_frequency = vidioc_s_frequency, 358 .vidioc_queryctrl = vidioc_queryctrl, 359 .vidioc_g_ctrl = vidioc_g_ctrl, 360 .vidioc_s_ctrl = vidioc_s_ctrl, 361 }; 362 363 static struct video_device typhoon_radio = { 364 .name = "Typhoon Radio", 365 .fops = &typhoon_fops, 366 .ioctl_ops = &typhoon_ioctl_ops, 367 }; 368 369 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 370 371 static int typhoon_proc_show(struct seq_file *m, void *v) 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 seq_puts(m, BANNER); 380 seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n"); 381 seq_printf(m, "frequency = %lu kHz\n", 382 typhoon_unit.curfreq >> 4); 383 seq_printf(m, "volume = %d\n", typhoon_unit.curvol); 384 seq_printf(m, "mute = %s\n", typhoon_unit.muted ? 385 "on" : "off"); 386 seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase); 387 seq_printf(m, "mute frequency = %lu kHz\n", 388 typhoon_unit.mutefreq >> 4); 389 return 0; 390 } 391 392 static int typhoon_proc_open(struct inode *inode, struct file *file) 393 { 394 return single_open(file, typhoon_proc_show, NULL); 395 } 396 397 static const struct file_operations typhoon_proc_fops = { 398 .owner = THIS_MODULE, 399 .open = typhoon_proc_open, 400 .read = seq_read, 401 .llseek = seq_lseek, 402 .release = single_release, 403 }; 404 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ 405 406 MODULE_AUTHOR("Dr. Henrik Seidel"); 407 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 408 MODULE_LICENSE("GPL"); 409 410 static int io = -1; 411 static int radio_nr = -1; 412 413 module_param(io, int, 0); 414 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 415 module_param(radio_nr, int, 0); 416 417 #ifdef MODULE 418 static unsigned long mutefreq; 419 module_param(mutefreq, ulong, 0); 420 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 421 #endif 422 423 static int __init typhoon_init(void) 424 { 425 #ifdef MODULE 426 if (io == -1) { 427 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); 428 return -EINVAL; 429 } 430 typhoon_unit.iobase = io; 431 432 if (mutefreq < 87000 || mutefreq > 108500) { 433 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); 434 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 435 return -EINVAL; 436 } 437 typhoon_unit.mutefreq = mutefreq; 438 #endif /* MODULE */ 439 440 printk(KERN_INFO BANNER); 441 mutex_init(&typhoon_unit.lock); 442 io = typhoon_unit.iobase; 443 if (!request_region(io, 8, "typhoon")) { 444 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", 445 typhoon_unit.iobase); 446 return -EBUSY; 447 } 448 449 typhoon_radio.priv = &typhoon_unit; 450 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1) 451 { 452 release_region(io, 8); 453 return -EINVAL; 454 } 455 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); 456 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", 457 typhoon_unit.mutefreq); 458 typhoon_unit.mutefreq <<= 4; 459 460 /* mute card - prevents noisy bootups */ 461 typhoon_mute(&typhoon_unit); 462 463 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 464 if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops)) 465 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); 466 #endif 467 468 return 0; 469 } 470 471 static void __exit typhoon_cleanup_module(void) 472 { 473 474 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 475 remove_proc_entry("driver/radio-typhoon", NULL); 476 #endif 477 478 video_unregister_device(&typhoon_radio); 479 release_region(io, 8); 480 } 481 482 module_init(typhoon_init); 483 module_exit(typhoon_cleanup_module); 484 485