1 /* radiotrack (radioreveal) driver for Linux radio support 2 * (c) 1997 M. Kirkwood 3 * Converted to new API by Alan Cox <Alan.Cox@linux.org> 4 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> 5 * 6 * History: 7 * 1999-02-24 Russell Kroll <rkroll@exploits.org> 8 * Fine tuning/VIDEO_TUNER_LOW 9 * Frequency range expanded to start at 87 MHz 10 * 11 * TODO: Allow for more than one of these foolish entities :-) 12 * 13 * Notes on the hardware (reverse engineered from other peoples' 14 * reverse engineering of AIMS' code :-) 15 * 16 * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); 17 * 18 * The signal strength query is unsurprisingly inaccurate. And it seems 19 * to indicate that (on my card, at least) the frequency setting isn't 20 * too great. (I have to tune up .025MHz from what the freq should be 21 * to get a report that the thing is tuned.) 22 * 23 * Volume control is (ugh) analogue: 24 * out(port, start_increasing_volume); 25 * wait(a_wee_while); 26 * out(port, stop_changing_the_volume); 27 * 28 */ 29 30 #include <linux/module.h> /* Modules */ 31 #include <linux/init.h> /* Initdata */ 32 #include <linux/ioport.h> /* check_region, request_region */ 33 #include <linux/delay.h> /* udelay */ 34 #include <asm/io.h> /* outb, outb_p */ 35 #include <asm/uaccess.h> /* copy to/from user */ 36 #include <linux/videodev.h> /* kernel radio structs */ 37 #include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */ 38 #include <asm/semaphore.h> /* Lock for the I/O */ 39 40 #ifndef CONFIG_RADIO_RTRACK_PORT 41 #define CONFIG_RADIO_RTRACK_PORT -1 42 #endif 43 44 static int io = CONFIG_RADIO_RTRACK_PORT; 45 static int radio_nr = -1; 46 static struct semaphore lock; 47 48 struct rt_device 49 { 50 int port; 51 int curvol; 52 unsigned long curfreq; 53 int muted; 54 }; 55 56 57 /* local things */ 58 59 static void sleep_delay(long n) 60 { 61 /* Sleep nicely for 'n' uS */ 62 int d=n/(1000000/HZ); 63 if(!d) 64 udelay(n); 65 else 66 msleep(jiffies_to_msecs(d)); 67 } 68 69 static void rt_decvol(void) 70 { 71 outb(0x58, io); /* volume down + sigstr + on */ 72 sleep_delay(100000); 73 outb(0xd8, io); /* volume steady + sigstr + on */ 74 } 75 76 static void rt_incvol(void) 77 { 78 outb(0x98, io); /* volume up + sigstr + on */ 79 sleep_delay(100000); 80 outb(0xd8, io); /* volume steady + sigstr + on */ 81 } 82 83 static void rt_mute(struct rt_device *dev) 84 { 85 dev->muted = 1; 86 down(&lock); 87 outb(0xd0, io); /* volume steady, off */ 88 up(&lock); 89 } 90 91 static int rt_setvol(struct rt_device *dev, int vol) 92 { 93 int i; 94 95 down(&lock); 96 97 if(vol == dev->curvol) { /* requested volume = current */ 98 if (dev->muted) { /* user is unmuting the card */ 99 dev->muted = 0; 100 outb (0xd8, io); /* enable card */ 101 } 102 up(&lock); 103 return 0; 104 } 105 106 if(vol == 0) { /* volume = 0 means mute the card */ 107 outb(0x48, io); /* volume down but still "on" */ 108 sleep_delay(2000000); /* make sure it's totally down */ 109 outb(0xd0, io); /* volume steady, off */ 110 dev->curvol = 0; /* track the volume state! */ 111 up(&lock); 112 return 0; 113 } 114 115 dev->muted = 0; 116 if(vol > dev->curvol) 117 for(i = dev->curvol; i < vol; i++) 118 rt_incvol(); 119 else 120 for(i = dev->curvol; i > vol; i--) 121 rt_decvol(); 122 123 dev->curvol = vol; 124 up(&lock); 125 return 0; 126 } 127 128 /* the 128+64 on these outb's is to keep the volume stable while tuning 129 * without them, the volume _will_ creep up with each frequency change 130 * and bit 4 (+16) is to keep the signal strength meter enabled 131 */ 132 133 static void send_0_byte(int port, struct rt_device *dev) 134 { 135 if ((dev->curvol == 0) || (dev->muted)) { 136 outb_p(128+64+16+ 1, port); /* wr-enable + data low */ 137 outb_p(128+64+16+2+1, port); /* clock */ 138 } 139 else { 140 outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */ 141 outb_p(128+64+16+8+2+1, port); /* clock */ 142 } 143 sleep_delay(1000); 144 } 145 146 static void send_1_byte(int port, struct rt_device *dev) 147 { 148 if ((dev->curvol == 0) || (dev->muted)) { 149 outb_p(128+64+16+4 +1, port); /* wr-enable+data high */ 150 outb_p(128+64+16+4+2+1, port); /* clock */ 151 } 152 else { 153 outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */ 154 outb_p(128+64+16+8+4+2+1, port); /* clock */ 155 } 156 157 sleep_delay(1000); 158 } 159 160 static int rt_setfreq(struct rt_device *dev, unsigned long freq) 161 { 162 int i; 163 164 /* adapted from radio-aztech.c */ 165 166 /* now uses VIDEO_TUNER_LOW for fine tuning */ 167 168 freq += 171200; /* Add 10.7 MHz IF */ 169 freq /= 800; /* Convert to 50 kHz units */ 170 171 down(&lock); /* Stop other ops interfering */ 172 173 send_0_byte (io, dev); /* 0: LSB of frequency */ 174 175 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ 176 if (freq & (1 << i)) 177 send_1_byte (io, dev); 178 else 179 send_0_byte (io, dev); 180 181 send_0_byte (io, dev); /* 14: test bit - always 0 */ 182 send_0_byte (io, dev); /* 15: test bit - always 0 */ 183 184 send_0_byte (io, dev); /* 16: band data 0 - always 0 */ 185 send_0_byte (io, dev); /* 17: band data 1 - always 0 */ 186 send_0_byte (io, dev); /* 18: band data 2 - always 0 */ 187 send_0_byte (io, dev); /* 19: time base - always 0 */ 188 189 send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */ 190 send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */ 191 send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */ 192 send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */ 193 194 if ((dev->curvol == 0) || (dev->muted)) 195 outb (0xd0, io); /* volume steady + sigstr */ 196 else 197 outb (0xd8, io); /* volume steady + sigstr + on */ 198 199 up(&lock); 200 201 return 0; 202 } 203 204 static int rt_getsigstr(struct rt_device *dev) 205 { 206 if (inb(io) & 2) /* bit set = no signal present */ 207 return 0; 208 return 1; /* signal present */ 209 } 210 211 static int rt_do_ioctl(struct inode *inode, struct file *file, 212 unsigned int cmd, void *arg) 213 { 214 struct video_device *dev = video_devdata(file); 215 struct rt_device *rt=dev->priv; 216 217 switch(cmd) 218 { 219 case VIDIOCGCAP: 220 { 221 struct video_capability *v = arg; 222 memset(v,0,sizeof(*v)); 223 v->type=VID_TYPE_TUNER; 224 v->channels=1; 225 v->audios=1; 226 strcpy(v->name, "RadioTrack"); 227 return 0; 228 } 229 case VIDIOCGTUNER: 230 { 231 struct video_tuner *v = arg; 232 if(v->tuner) /* Only 1 tuner */ 233 return -EINVAL; 234 v->rangelow=(87*16000); 235 v->rangehigh=(108*16000); 236 v->flags=VIDEO_TUNER_LOW; 237 v->mode=VIDEO_MODE_AUTO; 238 strcpy(v->name, "FM"); 239 v->signal=0xFFFF*rt_getsigstr(rt); 240 return 0; 241 } 242 case VIDIOCSTUNER: 243 { 244 struct video_tuner *v = arg; 245 if(v->tuner!=0) 246 return -EINVAL; 247 /* Only 1 tuner so no setting needed ! */ 248 return 0; 249 } 250 case VIDIOCGFREQ: 251 { 252 unsigned long *freq = arg; 253 *freq = rt->curfreq; 254 return 0; 255 } 256 case VIDIOCSFREQ: 257 { 258 unsigned long *freq = arg; 259 rt->curfreq = *freq; 260 rt_setfreq(rt, rt->curfreq); 261 return 0; 262 } 263 case VIDIOCGAUDIO: 264 { 265 struct video_audio *v = arg; 266 memset(v,0, sizeof(*v)); 267 v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; 268 v->volume=rt->curvol * 6554; 269 v->step=6554; 270 strcpy(v->name, "Radio"); 271 return 0; 272 } 273 case VIDIOCSAUDIO: 274 { 275 struct video_audio *v = arg; 276 if(v->audio) 277 return -EINVAL; 278 if(v->flags&VIDEO_AUDIO_MUTE) 279 rt_mute(rt); 280 else 281 rt_setvol(rt,v->volume/6554); 282 return 0; 283 } 284 default: 285 return -ENOIOCTLCMD; 286 } 287 } 288 289 static int rt_ioctl(struct inode *inode, struct file *file, 290 unsigned int cmd, unsigned long arg) 291 { 292 return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); 293 } 294 295 static struct rt_device rtrack_unit; 296 297 static struct file_operations rtrack_fops = { 298 .owner = THIS_MODULE, 299 .open = video_exclusive_open, 300 .release = video_exclusive_release, 301 .ioctl = rt_ioctl, 302 .llseek = no_llseek, 303 }; 304 305 static struct video_device rtrack_radio= 306 { 307 .owner = THIS_MODULE, 308 .name = "RadioTrack radio", 309 .type = VID_TYPE_TUNER, 310 .hardware = VID_HARDWARE_RTRACK, 311 .fops = &rtrack_fops, 312 }; 313 314 static int __init rtrack_init(void) 315 { 316 if(io==-1) 317 { 318 printk(KERN_ERR "You must set an I/O address with io=0x???\n"); 319 return -EINVAL; 320 } 321 322 if (!request_region(io, 2, "rtrack")) 323 { 324 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io); 325 return -EBUSY; 326 } 327 328 rtrack_radio.priv=&rtrack_unit; 329 330 if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1) 331 { 332 release_region(io, 2); 333 return -EINVAL; 334 } 335 printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n"); 336 337 /* Set up the I/O locking */ 338 339 init_MUTEX(&lock); 340 341 /* mute card - prevents noisy bootups */ 342 343 /* this ensures that the volume is all the way down */ 344 outb(0x48, io); /* volume down but still "on" */ 345 sleep_delay(2000000); /* make sure it's totally down */ 346 outb(0xc0, io); /* steady volume, mute card */ 347 rtrack_unit.curvol = 0; 348 349 return 0; 350 } 351 352 MODULE_AUTHOR("M.Kirkwood"); 353 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); 354 MODULE_LICENSE("GPL"); 355 356 module_param(io, int, 0); 357 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)"); 358 module_param(radio_nr, int, 0); 359 360 static void __exit cleanup_rtrack_module(void) 361 { 362 video_unregister_device(&rtrack_radio); 363 release_region(io,2); 364 } 365 366 module_init(rtrack_init); 367 module_exit(cleanup_rtrack_module); 368 369