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 <asm/io.h> /* outb, outb_p */ 39#include <asm/uaccess.h> /* copy to/from user */ 40#include <linux/videodev2.h> /* kernel radio structs */ 41#include <media/v4l2-common.h> 42 43#include <linux/version.h> /* for KERNEL_VERSION MACRO */ 44#define RADIO_VERSION KERNEL_VERSION(0,1,1) 45#define BANNER "Typhoon Radio Card driver v0.1.1\n" 46 47static struct v4l2_queryctrl radio_qctrl[] = { 48 { 49 .id = V4L2_CID_AUDIO_MUTE, 50 .name = "Mute", 51 .minimum = 0, 52 .maximum = 1, 53 .default_value = 1, 54 .type = V4L2_CTRL_TYPE_BOOLEAN, 55 },{ 56 .id = V4L2_CID_AUDIO_VOLUME, 57 .name = "Volume", 58 .minimum = 0, 59 .maximum = 65535, 60 .step = 1<<14, 61 .default_value = 0xff, 62 .type = V4L2_CTRL_TYPE_INTEGER, 63 } 64}; 65 66 67#ifndef CONFIG_RADIO_TYPHOON_PORT 68#define CONFIG_RADIO_TYPHOON_PORT -1 69#endif 70 71#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 72#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 73#endif 74 75#ifndef CONFIG_PROC_FS 76#undef CONFIG_RADIO_TYPHOON_PROC_FS 77#endif 78 79struct typhoon_device { 80 int users; 81 int iobase; 82 int curvol; 83 int muted; 84 unsigned long curfreq; 85 unsigned long mutefreq; 86 struct mutex lock; 87}; 88 89static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); 90static int typhoon_setfreq_generic(struct typhoon_device *dev, 91 unsigned long frequency); 92static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); 93static void typhoon_mute(struct typhoon_device *dev); 94static void typhoon_unmute(struct typhoon_device *dev); 95static int typhoon_setvol(struct typhoon_device *dev, int vol); 96#ifdef CONFIG_RADIO_TYPHOON_PROC_FS 97static int typhoon_get_info(char *buf, char **start, off_t offset, int len); 98#endif 99 100static void typhoon_setvol_generic(struct typhoon_device *dev, int vol) 101{ 102 mutex_lock(&dev->lock); 103 vol >>= 14; /* Map 16 bit to 2 bit */ 104 vol &= 3; 105 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ 106 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ 107 mutex_unlock(&dev->lock); 108} 109 110static int typhoon_setfreq_generic(struct typhoon_device *dev, 111 unsigned long frequency) 112{ 113 unsigned long outval; 114 unsigned long x; 115 116 /* 117 * The frequency transfer curve is not linear. The best fit I could 118 * get is 119 * 120 * outval = -155 + exp((f + 15.55) * 0.057)) 121 * 122 * where frequency f is in MHz. Since we don't have exp in the kernel, 123 * I approximate this function by a third order polynomial. 124 * 125 */ 126 127 mutex_lock(&dev->lock); 128 x = frequency / 160; 129 outval = (x * x + 2500) / 5000; 130 outval = (outval * x + 5000) / 10000; 131 outval -= (10 * x * x + 10433) / 20866; 132 outval += 4 * x - 11505; 133 134 outb_p((outval >> 8) & 0x01, dev->iobase + 4); 135 outb_p(outval >> 9, dev->iobase + 6); 136 outb_p(outval & 0xff, dev->iobase + 8); 137 mutex_unlock(&dev->lock); 138 139 return 0; 140} 141 142static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) 143{ 144 typhoon_setfreq_generic(dev, frequency); 145 dev->curfreq = frequency; 146 return 0; 147} 148 149static void typhoon_mute(struct typhoon_device *dev) 150{ 151 if (dev->muted == 1) 152 return; 153 typhoon_setvol_generic(dev, 0); 154 typhoon_setfreq_generic(dev, dev->mutefreq); 155 dev->muted = 1; 156} 157 158static void typhoon_unmute(struct typhoon_device *dev) 159{ 160 if (dev->muted == 0) 161 return; 162 typhoon_setfreq_generic(dev, dev->curfreq); 163 typhoon_setvol_generic(dev, dev->curvol); 164 dev->muted = 0; 165} 166 167static int typhoon_setvol(struct typhoon_device *dev, int vol) 168{ 169 if (dev->muted && vol != 0) { /* user is unmuting the card */ 170 dev->curvol = vol; 171 typhoon_unmute(dev); 172 return 0; 173 } 174 if (vol == dev->curvol) /* requested volume == current */ 175 return 0; 176 177 if (vol == 0) { /* volume == 0 means mute the card */ 178 typhoon_mute(dev); 179 dev->curvol = vol; 180 return 0; 181 } 182 typhoon_setvol_generic(dev, vol); 183 dev->curvol = vol; 184 return 0; 185} 186 187static int vidioc_querycap(struct file *file, void *priv, 188 struct v4l2_capability *v) 189{ 190 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); 191 strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); 192 sprintf(v->bus_info, "ISA"); 193 v->version = RADIO_VERSION; 194 v->capabilities = V4L2_CAP_TUNER; 195 return 0; 196} 197 198static int vidioc_g_tuner(struct file *file, void *priv, 199 struct v4l2_tuner *v) 200{ 201 if (v->index > 0) 202 return -EINVAL; 203 204 strcpy(v->name, "FM"); 205 v->type = V4L2_TUNER_RADIO; 206 v->rangelow = (87.5*16000); 207 v->rangehigh = (108*16000); 208 v->rxsubchans = V4L2_TUNER_SUB_MONO; 209 v->capability = V4L2_TUNER_CAP_LOW; 210 v->audmode = V4L2_TUNER_MODE_MONO; 211 v->signal = 0xFFFF; /* We can't get the signal strength */ 212 return 0; 213} 214 215static int vidioc_s_tuner(struct file *file, void *priv, 216 struct v4l2_tuner *v) 217{ 218 if (v->index > 0) 219 return -EINVAL; 220 221 return 0; 222} 223 224static int vidioc_s_frequency(struct file *file, void *priv, 225 struct v4l2_frequency *f) 226{ 227 struct video_device *dev = video_devdata(file); 228 struct typhoon_device *typhoon = dev->priv; 229 230 typhoon->curfreq = f->frequency; 231 typhoon_setfreq(typhoon, typhoon->curfreq); 232 return 0; 233} 234 235static int vidioc_g_frequency(struct file *file, void *priv, 236 struct v4l2_frequency *f) 237{ 238 struct video_device *dev = video_devdata(file); 239 struct typhoon_device *typhoon = dev->priv; 240 241 f->type = V4L2_TUNER_RADIO; 242 f->frequency = typhoon->curfreq; 243 244 return 0; 245} 246 247static int vidioc_queryctrl(struct file *file, void *priv, 248 struct v4l2_queryctrl *qc) 249{ 250 int i; 251 252 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { 253 if (qc->id && qc->id == radio_qctrl[i].id) { 254 memcpy(qc, &(radio_qctrl[i]), 255 sizeof(*qc)); 256 return 0; 257 } 258 } 259 return -EINVAL; 260} 261 262static int vidioc_g_ctrl(struct file *file, void *priv, 263 struct v4l2_control *ctrl) 264{ 265 struct video_device *dev = video_devdata(file); 266 struct typhoon_device *typhoon = dev->priv; 267 268 switch (ctrl->id) { 269 case V4L2_CID_AUDIO_MUTE: 270 ctrl->value = typhoon->muted; 271 return 0; 272 case V4L2_CID_AUDIO_VOLUME: 273 ctrl->value = typhoon->curvol; 274 return 0; 275 } 276 return -EINVAL; 277} 278 279static int vidioc_s_ctrl (struct file *file, void *priv, 280 struct v4l2_control *ctrl) 281{ 282 struct video_device *dev = video_devdata(file); 283 struct typhoon_device *typhoon = dev->priv; 284 285 switch (ctrl->id) { 286 case V4L2_CID_AUDIO_MUTE: 287 if (ctrl->value) 288 typhoon_mute(typhoon); 289 else 290 typhoon_unmute(typhoon); 291 return 0; 292 case V4L2_CID_AUDIO_VOLUME: 293 typhoon_setvol(typhoon, ctrl->value); 294 return 0; 295 } 296 return -EINVAL; 297} 298 299static int vidioc_g_audio(struct file *file, void *priv, 300 struct v4l2_audio *a) 301{ 302 if (a->index > 1) 303 return -EINVAL; 304 305 strcpy(a->name, "Radio"); 306 a->capability = V4L2_AUDCAP_STEREO; 307 return 0; 308} 309 310static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 311{ 312 *i = 0; 313 return 0; 314} 315 316static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 317{ 318 if (i != 0) 319 return -EINVAL; 320 return 0; 321} 322 323static int vidioc_s_audio(struct file *file, void *priv, 324 struct v4l2_audio *a) 325{ 326 if (a->index != 0) 327 return -EINVAL; 328 return 0; 329} 330 331static struct typhoon_device typhoon_unit = 332{ 333 .iobase = CONFIG_RADIO_TYPHOON_PORT, 334 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 335 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, 336}; 337 338static const struct file_operations typhoon_fops = { 339 .owner = THIS_MODULE, 340 .open = video_exclusive_open, 341 .release = video_exclusive_release, 342 .ioctl = video_ioctl2, 343 .compat_ioctl = v4l_compat_ioctl32, 344 .llseek = no_llseek, 345}; 346 347static struct video_device typhoon_radio = 348{ 349 .owner = THIS_MODULE, 350 .name = "Typhoon Radio", 351 .type = VID_TYPE_TUNER, 352 .hardware = 0, 353 .fops = &typhoon_fops, 354 .vidioc_querycap = vidioc_querycap, 355 .vidioc_g_tuner = vidioc_g_tuner, 356 .vidioc_s_tuner = vidioc_s_tuner, 357 .vidioc_g_audio = vidioc_g_audio, 358 .vidioc_s_audio = vidioc_s_audio, 359 .vidioc_g_input = vidioc_g_input, 360 .vidioc_s_input = vidioc_s_input, 361 .vidioc_g_frequency = vidioc_g_frequency, 362 .vidioc_s_frequency = vidioc_s_frequency, 363 .vidioc_queryctrl = vidioc_queryctrl, 364 .vidioc_g_ctrl = vidioc_g_ctrl, 365 .vidioc_s_ctrl = vidioc_s_ctrl, 366}; 367 368#ifdef CONFIG_RADIO_TYPHOON_PROC_FS 369 370static int typhoon_get_info(char *buf, char **start, off_t offset, int len) 371{ 372 char *out = buf; 373 374 #ifdef MODULE 375 #define MODULEPROCSTRING "Driver loaded as a module" 376 #else 377 #define MODULEPROCSTRING "Driver compiled into kernel" 378 #endif 379 380 /* output must be kept under PAGE_SIZE */ 381 out += sprintf(out, BANNER); 382 out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n"); 383 out += sprintf(out, "frequency = %lu kHz\n", 384 typhoon_unit.curfreq >> 4); 385 out += sprintf(out, "volume = %d\n", typhoon_unit.curvol); 386 out += sprintf(out, "mute = %s\n", typhoon_unit.muted ? 387 "on" : "off"); 388 out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase); 389 out += sprintf(out, "mute frequency = %lu kHz\n", 390 typhoon_unit.mutefreq >> 4); 391 return out - buf; 392} 393 394#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ 395 396MODULE_AUTHOR("Dr. Henrik Seidel"); 397MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 398MODULE_LICENSE("GPL"); 399 400static int io = -1; 401static int radio_nr = -1; 402 403module_param(io, int, 0); 404MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); 405module_param(radio_nr, int, 0); 406 407#ifdef MODULE 408static unsigned long mutefreq = 0; 409module_param(mutefreq, ulong, 0); 410MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 411#endif 412 413static int __init typhoon_init(void) 414{ 415#ifdef MODULE 416 if (io == -1) { 417 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); 418 return -EINVAL; 419 } 420 typhoon_unit.iobase = io; 421 422 if (mutefreq < 87000 || mutefreq > 108500) { 423 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); 424 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); 425 return -EINVAL; 426 } 427 typhoon_unit.mutefreq = mutefreq; 428#endif /* MODULE */ 429 430 printk(KERN_INFO BANNER); 431 mutex_init(&typhoon_unit.lock); 432 io = typhoon_unit.iobase; 433 if (!request_region(io, 8, "typhoon")) { 434 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", 435 typhoon_unit.iobase); 436 return -EBUSY; 437 } 438 439 typhoon_radio.priv = &typhoon_unit; 440 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1) 441 { 442 release_region(io, 8); 443 return -EINVAL; 444 } 445 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); 446 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", 447 typhoon_unit.mutefreq); 448 typhoon_unit.mutefreq <<= 4; 449 450 /* mute card - prevents noisy bootups */ 451 typhoon_mute(&typhoon_unit); 452 453#ifdef CONFIG_RADIO_TYPHOON_PROC_FS 454 if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL, 455 typhoon_get_info)) 456 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); 457#endif 458 459 return 0; 460} 461 462static void __exit typhoon_cleanup_module(void) 463{ 464 465#ifdef CONFIG_RADIO_TYPHOON_PROC_FS 466 remove_proc_entry("driver/radio-typhoon", NULL); 467#endif 468 469 video_unregister_device(&typhoon_radio); 470 release_region(io, 8); 471} 472 473module_init(typhoon_init); 474module_exit(typhoon_cleanup_module); 475