1 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support 2 * (c) 1999 R. Offermanns (rolf@offermanns.de) 3 * based on the aimslab radio driver from M. Kirkwood 4 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec) 5 * 6 * 7 * History: 8 * 1999-05-21 First preview release 9 * 10 * Notes on the hardware: 11 * There are two "main" chips on the card: 12 * - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf) 13 * - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf) 14 * (you can get the datasheet at the above links) 15 * 16 * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); 17 * Volume Control is done digitally 18 * 19 * there is a I2C controlled RDS decoder (SAA6588) onboard, which i would like to support someday 20 * (as soon i have understand how to get started :) 21 * If you can help me out with that, please contact me!! 22 * 23 * 24 */ 25 26 #include <linux/module.h> /* Modules */ 27 #include <linux/init.h> /* Initdata */ 28 #include <linux/ioport.h> /* check_region, request_region */ 29 #include <linux/delay.h> /* udelay */ 30 #include <asm/io.h> /* outb, outb_p */ 31 #include <asm/uaccess.h> /* copy to/from user */ 32 #include <linux/videodev.h> /* kernel radio structs */ 33 #include <linux/config.h> /* CONFIG_RADIO_TERRATEC_PORT */ 34 #include <linux/spinlock.h> 35 36 #ifndef CONFIG_RADIO_TERRATEC_PORT 37 #define CONFIG_RADIO_TERRATEC_PORT 0x590 38 #endif 39 40 /**************** this ones are for the terratec *******************/ 41 #define BASEPORT 0x590 42 #define VOLPORT 0x591 43 #define WRT_DIS 0x00 44 #define CLK_OFF 0x00 45 #define IIC_DATA 0x01 46 #define IIC_CLK 0x02 47 #define DATA 0x04 48 #define CLK_ON 0x08 49 #define WRT_EN 0x10 50 /*******************************************************************/ 51 52 static int io = CONFIG_RADIO_TERRATEC_PORT; 53 static int radio_nr = -1; 54 static spinlock_t lock; 55 56 struct tt_device 57 { 58 int port; 59 int curvol; 60 unsigned long curfreq; 61 int muted; 62 }; 63 64 65 /* local things */ 66 67 static void cardWriteVol(int volume) 68 { 69 int i; 70 volume = volume+(volume * 32); // change both channels 71 spin_lock(&lock); 72 for (i=0;i<8;i++) 73 { 74 if (volume & (0x80>>i)) 75 outb(0x80, VOLPORT); 76 else outb(0x00, VOLPORT); 77 } 78 spin_unlock(&lock); 79 } 80 81 82 83 static void tt_mute(struct tt_device *dev) 84 { 85 dev->muted = 1; 86 cardWriteVol(0); 87 } 88 89 static int tt_setvol(struct tt_device *dev, int vol) 90 { 91 92 // printk(KERN_ERR "setvol called, vol = %d\n", vol); 93 94 if(vol == dev->curvol) { /* requested volume = current */ 95 if (dev->muted) { /* user is unmuting the card */ 96 dev->muted = 0; 97 cardWriteVol(vol); /* enable card */ 98 } 99 100 return 0; 101 } 102 103 if(vol == 0) { /* volume = 0 means mute the card */ 104 cardWriteVol(0); /* "turn off card" by setting vol to 0 */ 105 dev->curvol = vol; /* track the volume state! */ 106 return 0; 107 } 108 109 dev->muted = 0; 110 111 cardWriteVol(vol); 112 113 dev->curvol = vol; 114 115 return 0; 116 117 } 118 119 120 /* this is the worst part in this driver */ 121 /* many more or less strange things are going on here, but hey, it works :) */ 122 123 static int tt_setfreq(struct tt_device *dev, unsigned long freq1) 124 { 125 int freq; 126 int i; 127 int p; 128 int temp; 129 long rest; 130 131 unsigned char buffer[25]; /* we have to bit shift 25 registers */ 132 freq = freq1/160; /* convert the freq. to a nice to handle value */ 133 for(i=24;i>-1;i--) 134 buffer[i]=0; 135 136 rest = freq*10+10700; /* i once had understood what is going on here */ 137 /* maybe some wise guy (friedhelm?) can comment this stuff */ 138 i=13; 139 p=10; 140 temp=102400; 141 while (rest!=0) 142 { 143 if (rest%temp == rest) 144 buffer[i] = 0; 145 else 146 { 147 buffer[i] = 1; 148 rest = rest-temp; 149 } 150 i--; 151 p--; 152 temp = temp/2; 153 } 154 155 spin_lock(&lock); 156 157 for (i=24;i>-1;i--) /* bit shift the values to the radiocard */ 158 { 159 if (buffer[i]==1) 160 { 161 outb(WRT_EN|DATA, BASEPORT); 162 outb(WRT_EN|DATA|CLK_ON , BASEPORT); 163 outb(WRT_EN|DATA, BASEPORT); 164 } 165 else 166 { 167 outb(WRT_EN|0x00, BASEPORT); 168 outb(WRT_EN|0x00|CLK_ON , BASEPORT); 169 } 170 } 171 outb(0x00, BASEPORT); 172 173 spin_unlock(&lock); 174 175 return 0; 176 } 177 178 static int tt_getsigstr(struct tt_device *dev) /* TODO */ 179 { 180 if (inb(io) & 2) /* bit set = no signal present */ 181 return 0; 182 return 1; /* signal present */ 183 } 184 185 186 /* implement the video4linux api */ 187 188 static int tt_do_ioctl(struct inode *inode, struct file *file, 189 unsigned int cmd, void *arg) 190 { 191 struct video_device *dev = video_devdata(file); 192 struct tt_device *tt=dev->priv; 193 194 switch(cmd) 195 { 196 case VIDIOCGCAP: 197 { 198 struct video_capability *v = arg; 199 memset(v,0,sizeof(*v)); 200 v->type=VID_TYPE_TUNER; 201 v->channels=1; 202 v->audios=1; 203 strcpy(v->name, "ActiveRadio"); 204 return 0; 205 } 206 case VIDIOCGTUNER: 207 { 208 struct video_tuner *v = arg; 209 if(v->tuner) /* Only 1 tuner */ 210 return -EINVAL; 211 v->rangelow=(87*16000); 212 v->rangehigh=(108*16000); 213 v->flags=VIDEO_TUNER_LOW; 214 v->mode=VIDEO_MODE_AUTO; 215 strcpy(v->name, "FM"); 216 v->signal=0xFFFF*tt_getsigstr(tt); 217 return 0; 218 } 219 case VIDIOCSTUNER: 220 { 221 struct video_tuner *v = arg; 222 if(v->tuner!=0) 223 return -EINVAL; 224 /* Only 1 tuner so no setting needed ! */ 225 return 0; 226 } 227 case VIDIOCGFREQ: 228 { 229 unsigned long *freq = arg; 230 *freq = tt->curfreq; 231 return 0; 232 } 233 case VIDIOCSFREQ: 234 { 235 unsigned long *freq = arg; 236 tt->curfreq = *freq; 237 tt_setfreq(tt, tt->curfreq); 238 return 0; 239 } 240 case VIDIOCGAUDIO: 241 { 242 struct video_audio *v = arg; 243 memset(v,0, sizeof(*v)); 244 v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; 245 v->volume=tt->curvol * 6554; 246 v->step=6554; 247 strcpy(v->name, "Radio"); 248 return 0; 249 } 250 case VIDIOCSAUDIO: 251 { 252 struct video_audio *v = arg; 253 if(v->audio) 254 return -EINVAL; 255 if(v->flags&VIDEO_AUDIO_MUTE) 256 tt_mute(tt); 257 else 258 tt_setvol(tt,v->volume/6554); 259 return 0; 260 } 261 default: 262 return -ENOIOCTLCMD; 263 } 264 } 265 266 static int tt_ioctl(struct inode *inode, struct file *file, 267 unsigned int cmd, unsigned long arg) 268 { 269 return video_usercopy(inode, file, cmd, arg, tt_do_ioctl); 270 } 271 272 static struct tt_device terratec_unit; 273 274 static struct file_operations terratec_fops = { 275 .owner = THIS_MODULE, 276 .open = video_exclusive_open, 277 .release = video_exclusive_release, 278 .ioctl = tt_ioctl, 279 .llseek = no_llseek, 280 }; 281 282 static struct video_device terratec_radio= 283 { 284 .owner = THIS_MODULE, 285 .name = "TerraTec ActiveRadio", 286 .type = VID_TYPE_TUNER, 287 .hardware = VID_HARDWARE_TERRATEC, 288 .fops = &terratec_fops, 289 }; 290 291 static int __init terratec_init(void) 292 { 293 if(io==-1) 294 { 295 printk(KERN_ERR "You must set an I/O address with io=0x???\n"); 296 return -EINVAL; 297 } 298 if (!request_region(io, 2, "terratec")) 299 { 300 printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io); 301 return -EBUSY; 302 } 303 304 terratec_radio.priv=&terratec_unit; 305 306 spin_lock_init(&lock); 307 308 if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1) 309 { 310 release_region(io,2); 311 return -EINVAL; 312 } 313 314 printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n"); 315 316 /* mute card - prevents noisy bootups */ 317 318 /* this ensures that the volume is all the way down */ 319 cardWriteVol(0); 320 terratec_unit.curvol = 0; 321 322 return 0; 323 } 324 325 MODULE_AUTHOR("R.OFFERMANNS & others"); 326 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card."); 327 MODULE_LICENSE("GPL"); 328 module_param(io, int, 0); 329 MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)"); 330 module_param(radio_nr, int, 0); 331 332 static void __exit terratec_cleanup_module(void) 333 { 334 video_unregister_device(&terratec_radio); 335 release_region(io,2); 336 printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n"); 337 } 338 339 module_init(terratec_init); 340 module_exit(terratec_cleanup_module); 341 342