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 43 MODULE_AUTHOR("Dr. Henrik Seidel"); 44 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 45 MODULE_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 55 static int io = CONFIG_RADIO_TYPHOON_PORT; 56 static int radio_nr = -1; 57 58 module_param(io, int, 0); 59 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 60 61 module_param(radio_nr, int, 0); 62 63 static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; 64 module_param(mutefreq, ulong, 0); 65 MODULE_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 71 struct 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 82 static struct typhoon typhoon_card; 83 84 static 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 94 static 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 } 125 126 static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency) 127 { 128 typhoon_setfreq_generic(dev, frequency); 129 dev->curfreq = frequency; 130 return 0; 131 } 132 133 static 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 } 141 142 static 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 } 150 151 static 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 } 170 171 static 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 } 181 182 static 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 } 198 199 static int vidioc_s_tuner(struct file *file, void *priv, 200 struct v4l2_tuner *v) 201 { 202 return v->index ? -EINVAL : 0; 203 } 204 205 static int vidioc_g_frequency(struct file *file, void *priv, 206 struct v4l2_frequency *f) 207 { 208 struct typhoon *dev = video_drvdata(file); 209 210 f->type = V4L2_TUNER_RADIO; 211 f->frequency = dev->curfreq; 212 return 0; 213 } 214 215 static int vidioc_s_frequency(struct file *file, void *priv, 216 struct v4l2_frequency *f) 217 { 218 struct typhoon *dev = video_drvdata(file); 219 220 dev->curfreq = f->frequency; 221 typhoon_setfreq(dev, dev->curfreq); 222 return 0; 223 } 224 225 static int vidioc_queryctrl(struct file *file, void *priv, 226 struct v4l2_queryctrl *qc) 227 { 228 switch (qc->id) { 229 case V4L2_CID_AUDIO_MUTE: 230 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 231 case V4L2_CID_AUDIO_VOLUME: 232 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535); 233 } 234 return -EINVAL; 235 } 236 237 static int vidioc_g_ctrl(struct file *file, void *priv, 238 struct v4l2_control *ctrl) 239 { 240 struct typhoon *dev = video_drvdata(file); 241 242 switch (ctrl->id) { 243 case V4L2_CID_AUDIO_MUTE: 244 ctrl->value = dev->muted; 245 return 0; 246 case V4L2_CID_AUDIO_VOLUME: 247 ctrl->value = dev->curvol; 248 return 0; 249 } 250 return -EINVAL; 251 } 252 253 static int vidioc_s_ctrl (struct file *file, void *priv, 254 struct v4l2_control *ctrl) 255 { 256 struct typhoon *dev = video_drvdata(file); 257 258 switch (ctrl->id) { 259 case V4L2_CID_AUDIO_MUTE: 260 if (ctrl->value) 261 typhoon_mute(dev); 262 else 263 typhoon_unmute(dev); 264 return 0; 265 case V4L2_CID_AUDIO_VOLUME: 266 typhoon_setvol(dev, ctrl->value); 267 return 0; 268 } 269 return -EINVAL; 270 } 271 272 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 273 { 274 *i = 0; 275 return 0; 276 } 277 278 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 279 { 280 return i ? -EINVAL : 0; 281 } 282 283 static int vidioc_g_audio(struct file *file, void *priv, 284 struct v4l2_audio *a) 285 { 286 a->index = 0; 287 strlcpy(a->name, "Radio", sizeof(a->name)); 288 a->capability = V4L2_AUDCAP_STEREO; 289 return 0; 290 } 291 292 static int vidioc_s_audio(struct file *file, void *priv, 293 struct v4l2_audio *a) 294 { 295 return a->index ? -EINVAL : 0; 296 } 297 298 static int vidioc_log_status(struct file *file, void *priv) 299 { 300 struct typhoon *dev = video_drvdata(file); 301 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 302 303 v4l2_info(v4l2_dev, BANNER); 304 #ifdef MODULE 305 v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n"); 306 #else 307 v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n"); 308 #endif 309 v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4); 310 v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol); 311 v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off"); 312 v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io); 313 v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4); 314 return 0; 315 } 316 317 static const struct v4l2_file_operations typhoon_fops = { 318 .owner = THIS_MODULE, 319 .ioctl = video_ioctl2, 320 }; 321 322 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { 323 .vidioc_log_status = vidioc_log_status, 324 .vidioc_querycap = vidioc_querycap, 325 .vidioc_g_tuner = vidioc_g_tuner, 326 .vidioc_s_tuner = vidioc_s_tuner, 327 .vidioc_g_audio = vidioc_g_audio, 328 .vidioc_s_audio = vidioc_s_audio, 329 .vidioc_g_input = vidioc_g_input, 330 .vidioc_s_input = vidioc_s_input, 331 .vidioc_g_frequency = vidioc_g_frequency, 332 .vidioc_s_frequency = vidioc_s_frequency, 333 .vidioc_queryctrl = vidioc_queryctrl, 334 .vidioc_g_ctrl = vidioc_g_ctrl, 335 .vidioc_s_ctrl = vidioc_s_ctrl, 336 }; 337 338 static int __init typhoon_init(void) 339 { 340 struct typhoon *dev = &typhoon_card; 341 struct v4l2_device *v4l2_dev = &dev->v4l2_dev; 342 int res; 343 344 strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name)); 345 dev->io = io; 346 dev->curfreq = dev->mutefreq = mutefreq; 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 (dev->mutefreq < 87000 || dev->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 } 358 359 mutex_init(&dev->lock); 360 if (!request_region(dev->io, 8, "typhoon")) { 361 v4l2_err(v4l2_dev, "port 0x%x already in use\n", 362 dev->io); 363 return -EBUSY; 364 } 365 366 res = v4l2_device_register(NULL, v4l2_dev); 367 if (res < 0) { 368 release_region(dev->io, 8); 369 v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); 370 return res; 371 } 372 v4l2_info(v4l2_dev, BANNER); 373 374 strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); 375 dev->vdev.v4l2_dev = v4l2_dev; 376 dev->vdev.fops = &typhoon_fops; 377 dev->vdev.ioctl_ops = &typhoon_ioctl_ops; 378 dev->vdev.release = video_device_release_empty; 379 video_set_drvdata(&dev->vdev, dev); 380 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { 381 v4l2_device_unregister(&dev->v4l2_dev); 382 release_region(dev->io, 8); 383 return -EINVAL; 384 } 385 v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io); 386 v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", dev->mutefreq); 387 dev->mutefreq <<= 4; 388 389 /* mute card - prevents noisy bootups */ 390 typhoon_mute(dev); 391 392 return 0; 393 } 394 395 static void __exit typhoon_exit(void) 396 { 397 struct typhoon *dev = &typhoon_card; 398 399 video_unregister_device(&dev->vdev); 400 v4l2_device_unregister(&dev->v4l2_dev); 401 release_region(dev->io, 8); 402 } 403 404 module_init(typhoon_init); 405 module_exit(typhoon_exit); 406 407