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 unsigned long in_use; 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 typhoon_device *typhoon = video_drvdata(file); 227 228 typhoon->curfreq = f->frequency; 229 typhoon_setfreq(typhoon, typhoon->curfreq); 230 return 0; 231 } 232 233 static int vidioc_g_frequency(struct file *file, void *priv, 234 struct v4l2_frequency *f) 235 { 236 struct typhoon_device *typhoon = video_drvdata(file); 237 238 f->type = V4L2_TUNER_RADIO; 239 f->frequency = typhoon->curfreq; 240 241 return 0; 242 } 243 244 static int vidioc_queryctrl(struct file *file, void *priv, 245 struct v4l2_queryctrl *qc) 246 { 247 int i; 248 249 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { 250 if (qc->id && qc->id == radio_qctrl[i].id) { 251 memcpy(qc, &(radio_qctrl[i]), 252 sizeof(*qc)); 253 return 0; 254 } 255 } 256 return -EINVAL; 257 } 258 259 static int vidioc_g_ctrl(struct file *file, void *priv, 260 struct v4l2_control *ctrl) 261 { 262 struct typhoon_device *typhoon = video_drvdata(file); 263 264 switch (ctrl->id) { 265 case V4L2_CID_AUDIO_MUTE: 266 ctrl->value = typhoon->muted; 267 return 0; 268 case V4L2_CID_AUDIO_VOLUME: 269 ctrl->value = typhoon->curvol; 270 return 0; 271 } 272 return -EINVAL; 273 } 274 275 static int vidioc_s_ctrl (struct file *file, void *priv, 276 struct v4l2_control *ctrl) 277 { 278 struct typhoon_device *typhoon = video_drvdata(file); 279 280 switch (ctrl->id) { 281 case V4L2_CID_AUDIO_MUTE: 282 if (ctrl->value) 283 typhoon_mute(typhoon); 284 else 285 typhoon_unmute(typhoon); 286 return 0; 287 case V4L2_CID_AUDIO_VOLUME: 288 typhoon_setvol(typhoon, ctrl->value); 289 return 0; 290 } 291 return -EINVAL; 292 } 293 294 static int vidioc_g_audio(struct file *file, void *priv, 295 struct v4l2_audio *a) 296 { 297 if (a->index > 1) 298 return -EINVAL; 299 300 strcpy(a->name, "Radio"); 301 a->capability = V4L2_AUDCAP_STEREO; 302 return 0; 303 } 304 305 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 306 { 307 *i = 0; 308 return 0; 309 } 310 311 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 312 { 313 if (i != 0) 314 return -EINVAL; 315 return 0; 316 } 317 318 static int vidioc_s_audio(struct file *file, void *priv, 319 struct v4l2_audio *a) 320 { 321 if (a->index != 0) 322 return -EINVAL; 323 return 0; 324 } 325 326 static struct typhoon_device typhoon_unit = 327 { 328 .iobase = CONFIG_RADIO_TYPHOON_PORT, 329 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 330 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 331 }; 332 333 static int typhoon_exclusive_open(struct inode *inode, struct file *file) 334 { 335 return test_and_set_bit(0, &typhoon_unit.in_use) ? -EBUSY : 0; 336 } 337 338 static int typhoon_exclusive_release(struct inode *inode, struct file *file) 339 { 340 clear_bit(0, &typhoon_unit.in_use); 341 return 0; 342 } 343 344 static const struct file_operations typhoon_fops = { 345 .owner = THIS_MODULE, 346 .open = typhoon_exclusive_open, 347 .release = typhoon_exclusive_release, 348 .ioctl = video_ioctl2, 349 #ifdef CONFIG_COMPAT 350 .compat_ioctl = v4l_compat_ioctl32, 351 #endif 352 .llseek = no_llseek, 353 }; 354 355 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { 356 .vidioc_querycap = vidioc_querycap, 357 .vidioc_g_tuner = vidioc_g_tuner, 358 .vidioc_s_tuner = vidioc_s_tuner, 359 .vidioc_g_audio = vidioc_g_audio, 360 .vidioc_s_audio = vidioc_s_audio, 361 .vidioc_g_input = vidioc_g_input, 362 .vidioc_s_input = vidioc_s_input, 363 .vidioc_g_frequency = vidioc_g_frequency, 364 .vidioc_s_frequency = vidioc_s_frequency, 365 .vidioc_queryctrl = vidioc_queryctrl, 366 .vidioc_g_ctrl = vidioc_g_ctrl, 367 .vidioc_s_ctrl = vidioc_s_ctrl, 368 }; 369 370 static struct video_device typhoon_radio = { 371 .name = "Typhoon Radio", 372 .fops = &typhoon_fops, 373 .ioctl_ops = &typhoon_ioctl_ops, 374 .release = video_device_release_empty, 375 }; 376 377 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 378 379 static int typhoon_proc_show(struct seq_file *m, void *v) 380 { 381 #ifdef MODULE 382 #define MODULEPROCSTRING "Driver loaded as a module" 383 #else 384 #define MODULEPROCSTRING "Driver compiled into kernel" 385 #endif 386 387 seq_puts(m, BANNER); 388 seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n"); 389 seq_printf(m, "frequency = %lu kHz\n", 390 typhoon_unit.curfreq >> 4); 391 seq_printf(m, "volume = %d\n", typhoon_unit.curvol); 392 seq_printf(m, "mute = %s\n", typhoon_unit.muted ? 393 "on" : "off"); 394 seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase); 395 seq_printf(m, "mute frequency = %lu kHz\n", 396 typhoon_unit.mutefreq >> 4); 397 return 0; 398 } 399 400 static int typhoon_proc_open(struct inode *inode, struct file *file) 401 { 402 return single_open(file, typhoon_proc_show, NULL); 403 } 404 405 static const struct file_operations typhoon_proc_fops = { 406 .owner = THIS_MODULE, 407 .open = typhoon_proc_open, 408 .read = seq_read, 409 .llseek = seq_lseek, 410 .release = single_release, 411 }; 412 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ 413 414 MODULE_AUTHOR("Dr. Henrik Seidel"); 415 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 416 MODULE_LICENSE("GPL"); 417 418 static int io = -1; 419 static int radio_nr = -1; 420 421 module_param(io, int, 0); 422 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 423 module_param(radio_nr, int, 0); 424 425 #ifdef MODULE 426 static unsigned long mutefreq; 427 module_param(mutefreq, ulong, 0); 428 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 429 #endif 430 431 static int __init typhoon_init(void) 432 { 433 #ifdef MODULE 434 if (io == -1) { 435 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); 436 return -EINVAL; 437 } 438 typhoon_unit.iobase = io; 439 440 if (mutefreq < 87000 || mutefreq > 108500) { 441 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); 442 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 443 return -EINVAL; 444 } 445 typhoon_unit.mutefreq = mutefreq; 446 #endif /* MODULE */ 447 448 printk(KERN_INFO BANNER); 449 mutex_init(&typhoon_unit.lock); 450 io = typhoon_unit.iobase; 451 if (!request_region(io, 8, "typhoon")) { 452 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", 453 typhoon_unit.iobase); 454 return -EBUSY; 455 } 456 457 video_set_drvdata(&typhoon_radio, &typhoon_unit); 458 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) < 0) { 459 release_region(io, 8); 460 return -EINVAL; 461 } 462 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); 463 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", 464 typhoon_unit.mutefreq); 465 typhoon_unit.mutefreq <<= 4; 466 467 /* mute card - prevents noisy bootups */ 468 typhoon_mute(&typhoon_unit); 469 470 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 471 if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops)) 472 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); 473 #endif 474 475 return 0; 476 } 477 478 static void __exit typhoon_cleanup_module(void) 479 { 480 481 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS 482 remove_proc_entry("driver/radio-typhoon", NULL); 483 #endif 484 485 video_unregister_device(&typhoon_radio); 486 release_region(io, 8); 487 } 488 489 module_init(typhoon_init); 490 module_exit(typhoon_cleanup_module); 491 492