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/version.h> /* for KERNEL_VERSION MACRO */ 38#include <linux/videodev2.h> /* kernel radio structs */ 39#include <linux/io.h> /* outb, outb_p */ 40#include <media/v4l2-device.h> 41#include <media/v4l2-ioctl.h> 42 43MODULE_AUTHOR("Dr. Henrik Seidel"); 44MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 45MODULE_LICENSE("GPL"); 46 47#ifndef CONFIG_RADIO_TYPHOON_PORT 48#define CONFIG_RADIO_TYPHOON_PORT -1 49#endif 50 51#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 52#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 53#endif 54 55static int io = CONFIG_RADIO_TYPHOON_PORT; 56static int radio_nr = -1; 57 58module_param(io, int, 0); 59MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 60 61module_param(radio_nr, int, 0); 62 63static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; 64module_param(mutefreq, ulong, 0); 65MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 66 67#define RADIO_VERSION KERNEL_VERSION(0, 1, 1) 68 69#define BANNER "Typhoon Radio Card driver v0.1.1\n" 70 71struct typhoon { 72 struct v4l2_device v4l2_dev; 73 struct video_device vdev; 74 int io; 75 int curvol; 76 int muted; 77 unsigned long curfreq; 78 unsigned long mutefreq; 79 struct mutex lock; 80}; 81 82static struct typhoon typhoon_card; 83 84static void typhoon_setvol_generic(struct typhoon *dev, int vol) 85{ 86 mutex_lock(&dev->lock); 87 vol >>= 14; /* Map 16 bit to 2 bit */ 88 vol &= 3; 89 outb_p(vol / 2, dev->io); /* Set the volume, high bit. */ 90 outb_p(vol % 2, dev->io + 2); /* Set the volume, low bit. */ 91 mutex_unlock(&dev->lock); 92} 93 94static int typhoon_setfreq_generic(struct typhoon *dev, 95 unsigned long frequency) 96{ 97 unsigned long outval; 98 unsigned long x; 99 100 /* 101 * The frequency transfer curve is not linear. The best fit I could 102 * get is 103 * 104 * outval = -155 + exp((f + 15.55) * 0.057)) 105 * 106 * where frequency f is in MHz. Since we don't have exp in the kernel, 107 * I approximate this function by a third order polynomial. 108 * 109 */ 110 111 mutex_lock(&dev->lock); 112 x = frequency / 160; 113 outval = (x * x + 2500) / 5000; 114 outval = (outval * x + 5000) / 10000; 115 outval -= (10 * x * x + 10433) / 20866; 116 outval += 4 * x - 11505; 117 118 outb_p((outval >> 8) & 0x01, dev->io + 4); 119 outb_p(outval >> 9, dev->io + 6); 120 outb_p(outval & 0xff, dev->io + 8); 121 mutex_unlock(&dev->lock); 122 123 return 0; 124} 125 126static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency) 127{ 128 typhoon_setfreq_generic(dev, frequency); 129 dev->curfreq = frequency; 130 return 0; 131} 132 133static void typhoon_mute(struct typhoon *dev) 134{ 135 if (dev->muted == 1) 136 return; 137 typhoon_setvol_generic(dev, 0); 138 typhoon_setfreq_generic(dev, dev->mutefreq); 139 dev->muted = 1; 140} 141 142static void typhoon_unmute(struct typhoon *dev) 143{ 144 if (dev->muted == 0) 145 return; 146 typhoon_setfreq_generic(dev, dev->curfreq); 147 typhoon_setvol_generic(dev, dev->curvol); 148 dev->muted = 0; 149} 150 151static int typhoon_setvol(struct typhoon *dev, int vol) 152{ 153 if (dev->muted && vol != 0) { /* user is unmuting the card */ 154 dev->curvol = vol; 155 typhoon_unmute(dev); 156 return 0; 157 } 158 if (vol == dev->curvol) /* requested volume == current */ 159 return 0; 160 161 if (vol == 0) { /* volume == 0 means mute the card */ 162 typhoon_mute(dev); 163 dev->curvol = vol; 164 return 0; 165 } 166 typhoon_setvol_generic(dev, vol); 167 dev->curvol = vol; 168 return 0; 169} 170 171static int vidioc_querycap(struct file *file, void *priv, 172 struct v4l2_capability *v) 173{ 174 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); 175 strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); 176 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info)); 177 v->version = RADIO_VERSION; 178 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; 179 return 0; 180} 181 182static int vidioc_g_tuner(struct file *file, void *priv, 183 struct v4l2_tuner *v) 184{ 185 if (v->index > 0) 186 return -EINVAL; 187 188 strlcpy(v->name, "FM", sizeof(v->name)); 189 v->type = V4L2_TUNER_RADIO; 190 v->rangelow = 87.5 * 16000; 191 v->rangehigh = 108 * 16000; 192 v->rxsubchans = V4L2_TUNER_SUB_MONO; 193 v->capability = V4L2_TUNER_CAP_LOW; 194 v->audmode = V4L2_TUNER_MODE_MONO; 195 v->signal = 0xFFFF; /* We can't get the signal strength */ 196 return 0; 197} 198 199static int vidioc_s_tuner(struct file *file, void *priv, 200 struct v4l2_tuner *v) 201{ 202 return v->index ? -EINVAL : 0; 203} 204 205static int vidioc_g_frequency(struct file *file, void *priv, 206 struct v4l2_frequency *f) 207{ 208 struct typhoon *dev = video_drvdata(file); 209 210 if (f->tuner != 0) 211 return -EINVAL; 212 f->type = V4L2_TUNER_RADIO; 213 f->frequency = dev->curfreq; 214 return 0; 215} 216 217static int vidioc_s_frequency(struct file *file, void *priv, 218 struct v4l2_frequency *f) 219{ 220 struct typhoon *dev = video_drvdata(file); 221 222 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) 223 return -EINVAL; 224 dev->curfreq = f->frequency; 225 typhoon_setfreq(dev, dev->curfreq); 226 return 0; 227} 228 229static int vidioc_queryctrl(struct file *file, void *priv, 230 struct v4l2_queryctrl *qc) 231{ 232 switch (qc->id) { 233 case V4L2_CID_AUDIO_MUTE: 234 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 235 case V4L2_CID_AUDIO_VOLUME: 236 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535); 237 } 238 return -EINVAL; 239} 240 241static int vidioc_g_ctrl(struct file *file, void *priv, 242 struct v4l2_control *ctrl) 243{ 244 struct typhoon *dev = video_drvdata(file); 245 246 switch (ctrl->id) { 247 case V4L2_CID_AUDIO_MUTE: 248 ctrl->value = dev->muted; 249 return 0; 250 case V4L2_CID_AUDIO_VOLUME: 251 ctrl->value = dev->curvol; 252 return 0; 253 } 254 return -EINVAL; 255} 256 257static int vidioc_s_ctrl (struct file *file, void *priv, 258 struct v4l2_control *ctrl) 259{ 260 struct typhoon *dev = video_drvdata(file); 261 262 switch (ctrl->id) { 263 case V4L2_CID_AUDIO_MUTE: 264 if (ctrl->value) 265 typhoon_mute(dev); 266 else 267 typhoon_unmute(dev); 268 return 0; 269 case V4L2_CID_AUDIO_VOLUME: 270 typhoon_setvol(dev, ctrl->value); 271 return 0; 272 } 273 return -EINVAL; 274} 275 276static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 277{ 278 *i = 0; 279 return 0; 280} 281 282static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 283{ 284 return i ? -EINVAL : 0; 285} 286 287static int vidioc_g_audio(struct file *file, void *priv, 288 struct v4l2_audio *a) 289{ 290 a->index = 0; 291 strlcpy(a->name, "Radio", sizeof(a->name)); 292 a->capability = V4L2_AUDCAP_STEREO; 293 return 0; 294} 295 296static int vidioc_s_audio(struct file *file, void *priv, 297 struct v4l2_audio *a) 298{ 299 return a->index ? -EINVAL : 0; 300} 301 302static int vidioc_log_status(struct file *file, void *priv) 303{ 304 struct typhoon *dev = video_drvdata(file); 305 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 306 307 v4l2_info(v4l2_dev, BANNER); 308#ifdef MODULE 309 v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n"); 310#else 311 v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n"); 312#endif 313 v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4); 314 v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol); 315 v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off"); 316 v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io); 317 v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4); 318 return 0; 319} 320 321static const struct v4l2_file_operations typhoon_fops = { 322 .owner = THIS_MODULE, 323 .ioctl = video_ioctl2, 324}; 325 326static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { 327 .vidioc_log_status = vidioc_log_status, 328 .vidioc_querycap = vidioc_querycap, 329 .vidioc_g_tuner = vidioc_g_tuner, 330 .vidioc_s_tuner = vidioc_s_tuner, 331 .vidioc_g_audio = vidioc_g_audio, 332 .vidioc_s_audio = vidioc_s_audio, 333 .vidioc_g_input = vidioc_g_input, 334 .vidioc_s_input = vidioc_s_input, 335 .vidioc_g_frequency = vidioc_g_frequency, 336 .vidioc_s_frequency = vidioc_s_frequency, 337 .vidioc_queryctrl = vidioc_queryctrl, 338 .vidioc_g_ctrl = vidioc_g_ctrl, 339 .vidioc_s_ctrl = vidioc_s_ctrl, 340}; 341 342static int __init typhoon_init(void) 343{ 344 struct typhoon *dev = &typhoon_card; 345 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 346 int res; 347 348 strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name)); 349 dev->io = io; 350 dev->curfreq = dev->mutefreq = mutefreq; 351 352 if (dev->io == -1) { 353 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n"); 354 return -EINVAL; 355 } 356 357 if (dev->mutefreq < 87000 || dev->mutefreq > 108500) { 358 v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n"); 359 v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 360 return -EINVAL; 361 } 362 363 mutex_init(&dev->lock); 364 if (!request_region(dev->io, 8, "typhoon")) { 365 v4l2_err(v4l2_dev, "port 0x%x already in use\n", 366 dev->io); 367 return -EBUSY; 368 } 369 370 res = v4l2_device_register(NULL, v4l2_dev); 371 if (res < 0) { 372 release_region(dev->io, 8); 373 v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); 374 return res; 375 } 376 v4l2_info(v4l2_dev, BANNER); 377 378 strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); 379 dev->vdev.v4l2_dev = v4l2_dev; 380 dev->vdev.fops = &typhoon_fops; 381 dev->vdev.ioctl_ops = &typhoon_ioctl_ops; 382 dev->vdev.release = video_device_release_empty; 383 video_set_drvdata(&dev->vdev, dev); 384 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { 385 v4l2_device_unregister(&dev->v4l2_dev); 386 release_region(dev->io, 8); 387 return -EINVAL; 388 } 389 v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io); 390 v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", dev->mutefreq); 391 dev->mutefreq <<= 4; 392 393 /* mute card - prevents noisy bootups */ 394 typhoon_mute(dev); 395 396 return 0; 397} 398 399static void __exit typhoon_exit(void) 400{ 401 struct typhoon *dev = &typhoon_card; 402 403 video_unregister_device(&dev->vdev); 404 v4l2_device_unregister(&dev->v4l2_dev); 405 release_region(dev->io, 8); 406} 407 408module_init(typhoon_init); 409module_exit(typhoon_exit); 410