1 /* Typhoon Radio Card driver for radio support 2 * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> 3 * 4 * Notes on the hardware 5 * 6 * This card has two output sockets, one for speakers and one for line. 7 * The speaker output has volume control, but only in four discrete 8 * steps. The line output has neither volume control nor mute. 9 * 10 * The card has auto-stereo according to its manual, although it all 11 * sounds mono to me (even with the Win/DOS drivers). Maybe it's my 12 * antenna - I really don't know for sure. 13 * 14 * Frequency control is done digitally. 15 * 16 * Volume control is done digitally, but there are only four different 17 * possible values. So you should better always turn the volume up and 18 * use line control. I got the best results by connecting line output 19 * to the sound card microphone input. For such a configuration the 20 * volume control has no effect, since volume control only influences 21 * the speaker output. 22 * 23 * There is no explicit mute/unmute. So I set the radio frequency to a 24 * value where I do expect just noise and turn the speaker volume down. 25 * The frequency change is necessary since the card never seems to be 26 * completely silent. 27 * 28 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> 29 */ 30 31 #include <linux/module.h> /* Modules */ 32 #include <linux/init.h> /* Initdata */ 33 #include <linux/ioport.h> /* request_region */ 34 #include <linux/version.h> /* for KERNEL_VERSION MACRO */ 35 #include <linux/videodev2.h> /* kernel radio structs */ 36 #include <linux/io.h> /* outb, outb_p */ 37 #include <media/v4l2-device.h> 38 #include <media/v4l2-ioctl.h> 39 40 MODULE_AUTHOR("Dr. Henrik Seidel"); 41 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 42 MODULE_LICENSE("GPL"); 43 44 #ifndef CONFIG_RADIO_TYPHOON_PORT 45 #define CONFIG_RADIO_TYPHOON_PORT -1 46 #endif 47 48 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 49 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 50 #endif 51 52 static int io = CONFIG_RADIO_TYPHOON_PORT; 53 static int radio_nr = -1; 54 55 module_param(io, int, 0); 56 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 57 58 module_param(radio_nr, int, 0); 59 60 static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; 61 module_param(mutefreq, ulong, 0); 62 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 63 64 #define RADIO_VERSION KERNEL_VERSION(0, 1, 1) 65 66 #define BANNER "Typhoon Radio Card driver v0.1.1\n" 67 68 struct typhoon { 69 struct v4l2_device v4l2_dev; 70 struct video_device vdev; 71 int io; 72 int curvol; 73 int muted; 74 unsigned long curfreq; 75 unsigned long mutefreq; 76 struct mutex lock; 77 }; 78 79 static struct typhoon typhoon_card; 80 81 static void typhoon_setvol_generic(struct typhoon *dev, int vol) 82 { 83 mutex_lock(&dev->lock); 84 vol >>= 14; /* Map 16 bit to 2 bit */ 85 vol &= 3; 86 outb_p(vol / 2, dev->io); /* Set the volume, high bit. */ 87 outb_p(vol % 2, dev->io + 2); /* Set the volume, low bit. */ 88 mutex_unlock(&dev->lock); 89 } 90 91 static int typhoon_setfreq_generic(struct typhoon *dev, 92 unsigned long frequency) 93 { 94 unsigned long outval; 95 unsigned long x; 96 97 /* 98 * The frequency transfer curve is not linear. The best fit I could 99 * get is 100 * 101 * outval = -155 + exp((f + 15.55) * 0.057)) 102 * 103 * where frequency f is in MHz. Since we don't have exp in the kernel, 104 * I approximate this function by a third order polynomial. 105 * 106 */ 107 108 mutex_lock(&dev->lock); 109 x = frequency / 160; 110 outval = (x * x + 2500) / 5000; 111 outval = (outval * x + 5000) / 10000; 112 outval -= (10 * x * x + 10433) / 20866; 113 outval += 4 * x - 11505; 114 115 outb_p((outval >> 8) & 0x01, dev->io + 4); 116 outb_p(outval >> 9, dev->io + 6); 117 outb_p(outval & 0xff, dev->io + 8); 118 mutex_unlock(&dev->lock); 119 120 return 0; 121 } 122 123 static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency) 124 { 125 typhoon_setfreq_generic(dev, frequency); 126 dev->curfreq = frequency; 127 return 0; 128 } 129 130 static void typhoon_mute(struct typhoon *dev) 131 { 132 if (dev->muted == 1) 133 return; 134 typhoon_setvol_generic(dev, 0); 135 typhoon_setfreq_generic(dev, dev->mutefreq); 136 dev->muted = 1; 137 } 138 139 static void typhoon_unmute(struct typhoon *dev) 140 { 141 if (dev->muted == 0) 142 return; 143 typhoon_setfreq_generic(dev, dev->curfreq); 144 typhoon_setvol_generic(dev, dev->curvol); 145 dev->muted = 0; 146 } 147 148 static int typhoon_setvol(struct typhoon *dev, int vol) 149 { 150 if (dev->muted && vol != 0) { /* user is unmuting the card */ 151 dev->curvol = vol; 152 typhoon_unmute(dev); 153 return 0; 154 } 155 if (vol == dev->curvol) /* requested volume == current */ 156 return 0; 157 158 if (vol == 0) { /* volume == 0 means mute the card */ 159 typhoon_mute(dev); 160 dev->curvol = vol; 161 return 0; 162 } 163 typhoon_setvol_generic(dev, vol); 164 dev->curvol = vol; 165 return 0; 166 } 167 168 static int vidioc_querycap(struct file *file, void *priv, 169 struct v4l2_capability *v) 170 { 171 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); 172 strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); 173 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info)); 174 v->version = RADIO_VERSION; 175 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; 176 return 0; 177 } 178 179 static int vidioc_g_tuner(struct file *file, void *priv, 180 struct v4l2_tuner *v) 181 { 182 if (v->index > 0) 183 return -EINVAL; 184 185 strlcpy(v->name, "FM", sizeof(v->name)); 186 v->type = V4L2_TUNER_RADIO; 187 v->rangelow = 87.5 * 16000; 188 v->rangehigh = 108 * 16000; 189 v->rxsubchans = V4L2_TUNER_SUB_MONO; 190 v->capability = V4L2_TUNER_CAP_LOW; 191 v->audmode = V4L2_TUNER_MODE_MONO; 192 v->signal = 0xFFFF; /* We can't get the signal strength */ 193 return 0; 194 } 195 196 static int vidioc_s_tuner(struct file *file, void *priv, 197 struct v4l2_tuner *v) 198 { 199 return v->index ? -EINVAL : 0; 200 } 201 202 static int vidioc_g_frequency(struct file *file, void *priv, 203 struct v4l2_frequency *f) 204 { 205 struct typhoon *dev = video_drvdata(file); 206 207 if (f->tuner != 0) 208 return -EINVAL; 209 f->type = V4L2_TUNER_RADIO; 210 f->frequency = dev->curfreq; 211 return 0; 212 } 213 214 static int vidioc_s_frequency(struct file *file, void *priv, 215 struct v4l2_frequency *f) 216 { 217 struct typhoon *dev = video_drvdata(file); 218 219 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) 220 return -EINVAL; 221 dev->curfreq = f->frequency; 222 typhoon_setfreq(dev, dev->curfreq); 223 return 0; 224 } 225 226 static int vidioc_queryctrl(struct file *file, void *priv, 227 struct v4l2_queryctrl *qc) 228 { 229 switch (qc->id) { 230 case V4L2_CID_AUDIO_MUTE: 231 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 232 case V4L2_CID_AUDIO_VOLUME: 233 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535); 234 } 235 return -EINVAL; 236 } 237 238 static int vidioc_g_ctrl(struct file *file, void *priv, 239 struct v4l2_control *ctrl) 240 { 241 struct typhoon *dev = video_drvdata(file); 242 243 switch (ctrl->id) { 244 case V4L2_CID_AUDIO_MUTE: 245 ctrl->value = dev->muted; 246 return 0; 247 case V4L2_CID_AUDIO_VOLUME: 248 ctrl->value = dev->curvol; 249 return 0; 250 } 251 return -EINVAL; 252 } 253 254 static int vidioc_s_ctrl (struct file *file, void *priv, 255 struct v4l2_control *ctrl) 256 { 257 struct typhoon *dev = video_drvdata(file); 258 259 switch (ctrl->id) { 260 case V4L2_CID_AUDIO_MUTE: 261 if (ctrl->value) 262 typhoon_mute(dev); 263 else 264 typhoon_unmute(dev); 265 return 0; 266 case V4L2_CID_AUDIO_VOLUME: 267 typhoon_setvol(dev, ctrl->value); 268 return 0; 269 } 270 return -EINVAL; 271 } 272 273 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 274 { 275 *i = 0; 276 return 0; 277 } 278 279 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 280 { 281 return i ? -EINVAL : 0; 282 } 283 284 static int vidioc_g_audio(struct file *file, void *priv, 285 struct v4l2_audio *a) 286 { 287 a->index = 0; 288 strlcpy(a->name, "Radio", sizeof(a->name)); 289 a->capability = V4L2_AUDCAP_STEREO; 290 return 0; 291 } 292 293 static int vidioc_s_audio(struct file *file, void *priv, 294 struct v4l2_audio *a) 295 { 296 return a->index ? -EINVAL : 0; 297 } 298 299 static int vidioc_log_status(struct file *file, void *priv) 300 { 301 struct typhoon *dev = video_drvdata(file); 302 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 303 304 v4l2_info(v4l2_dev, BANNER); 305 #ifdef MODULE 306 v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n"); 307 #else 308 v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n"); 309 #endif 310 v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4); 311 v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol); 312 v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off"); 313 v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io); 314 v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4); 315 return 0; 316 } 317 318 static const struct v4l2_file_operations typhoon_fops = { 319 .owner = THIS_MODULE, 320 .unlocked_ioctl = video_ioctl2, 321 }; 322 323 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { 324 .vidioc_log_status = vidioc_log_status, 325 .vidioc_querycap = vidioc_querycap, 326 .vidioc_g_tuner = vidioc_g_tuner, 327 .vidioc_s_tuner = vidioc_s_tuner, 328 .vidioc_g_audio = vidioc_g_audio, 329 .vidioc_s_audio = vidioc_s_audio, 330 .vidioc_g_input = vidioc_g_input, 331 .vidioc_s_input = vidioc_s_input, 332 .vidioc_g_frequency = vidioc_g_frequency, 333 .vidioc_s_frequency = vidioc_s_frequency, 334 .vidioc_queryctrl = vidioc_queryctrl, 335 .vidioc_g_ctrl = vidioc_g_ctrl, 336 .vidioc_s_ctrl = vidioc_s_ctrl, 337 }; 338 339 static int __init typhoon_init(void) 340 { 341 struct typhoon *dev = &typhoon_card; 342 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 343 int res; 344 345 strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name)); 346 dev->io = io; 347 348 if (dev->io == -1) { 349 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n"); 350 return -EINVAL; 351 } 352 353 if (mutefreq < 87000 || mutefreq > 108500) { 354 v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n"); 355 v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 356 return -EINVAL; 357 } 358 dev->curfreq = dev->mutefreq = mutefreq << 4; 359 360 mutex_init(&dev->lock); 361 if (!request_region(dev->io, 8, "typhoon")) { 362 v4l2_err(v4l2_dev, "port 0x%x already in use\n", 363 dev->io); 364 return -EBUSY; 365 } 366 367 res = v4l2_device_register(NULL, v4l2_dev); 368 if (res < 0) { 369 release_region(dev->io, 8); 370 v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); 371 return res; 372 } 373 v4l2_info(v4l2_dev, BANNER); 374 375 strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); 376 dev->vdev.v4l2_dev = v4l2_dev; 377 dev->vdev.fops = &typhoon_fops; 378 dev->vdev.ioctl_ops = &typhoon_ioctl_ops; 379 dev->vdev.release = video_device_release_empty; 380 video_set_drvdata(&dev->vdev, dev); 381 382 /* mute card - prevents noisy bootups */ 383 typhoon_mute(dev); 384 385 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { 386 v4l2_device_unregister(&dev->v4l2_dev); 387 release_region(dev->io, 8); 388 return -EINVAL; 389 } 390 v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io); 391 v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq); 392 393 return 0; 394 } 395 396 static void __exit typhoon_exit(void) 397 { 398 struct typhoon *dev = &typhoon_card; 399 400 video_unregister_device(&dev->vdev); 401 v4l2_device_unregister(&dev->v4l2_dev); 402 release_region(dev->io, 8); 403 } 404 405 module_init(typhoon_init); 406 module_exit(typhoon_exit); 407 408