Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 27 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | */ |
| 29 | |
| 30 | #include <linux/module.h> /* Modules */ |
| 31 | #include <linux/init.h> /* Initdata */ |
Peter Osterlund | fb911ee | 2005-09-13 01:25:15 -0700 | [diff] [blame] | 32 | #include <linux/ioport.h> /* request_region */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Mauro Carvalho Chehab | 5e87efa | 2006-06-05 10:26:32 -0300 | [diff] [blame] | 37 | #include <media/v4l2-common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */ |
| 39 | #include <asm/semaphore.h> /* Lock for the I/O */ |
| 40 | |
| 41 | #ifndef CONFIG_RADIO_RTRACK_PORT |
| 42 | #define CONFIG_RADIO_RTRACK_PORT -1 |
| 43 | #endif |
| 44 | |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 45 | static int io = CONFIG_RADIO_RTRACK_PORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | static int radio_nr = -1; |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 47 | static struct mutex lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | struct rt_device |
| 50 | { |
| 51 | int port; |
| 52 | int curvol; |
| 53 | unsigned long curfreq; |
| 54 | int muted; |
| 55 | }; |
| 56 | |
| 57 | |
| 58 | /* local things */ |
| 59 | |
| 60 | static void sleep_delay(long n) |
| 61 | { |
| 62 | /* Sleep nicely for 'n' uS */ |
| 63 | int d=n/(1000000/HZ); |
| 64 | if(!d) |
| 65 | udelay(n); |
| 66 | else |
| 67 | msleep(jiffies_to_msecs(d)); |
| 68 | } |
| 69 | |
| 70 | static void rt_decvol(void) |
| 71 | { |
| 72 | outb(0x58, io); /* volume down + sigstr + on */ |
| 73 | sleep_delay(100000); |
| 74 | outb(0xd8, io); /* volume steady + sigstr + on */ |
| 75 | } |
| 76 | |
| 77 | static void rt_incvol(void) |
| 78 | { |
| 79 | outb(0x98, io); /* volume up + sigstr + on */ |
| 80 | sleep_delay(100000); |
| 81 | outb(0xd8, io); /* volume steady + sigstr + on */ |
| 82 | } |
| 83 | |
| 84 | static void rt_mute(struct rt_device *dev) |
| 85 | { |
| 86 | dev->muted = 1; |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 87 | mutex_lock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | outb(0xd0, io); /* volume steady, off */ |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 89 | mutex_unlock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static int rt_setvol(struct rt_device *dev, int vol) |
| 93 | { |
| 94 | int i; |
| 95 | |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 96 | mutex_lock(&lock); |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | if(vol == dev->curvol) { /* requested volume = current */ |
| 99 | if (dev->muted) { /* user is unmuting the card */ |
| 100 | dev->muted = 0; |
| 101 | outb (0xd8, io); /* enable card */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 102 | } |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 103 | mutex_unlock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | if(vol == 0) { /* volume = 0 means mute the card */ |
| 108 | outb(0x48, io); /* volume down but still "on" */ |
| 109 | sleep_delay(2000000); /* make sure it's totally down */ |
| 110 | outb(0xd0, io); /* volume steady, off */ |
| 111 | dev->curvol = 0; /* track the volume state! */ |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 112 | mutex_unlock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | dev->muted = 0; |
| 117 | if(vol > dev->curvol) |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 118 | for(i = dev->curvol; i < vol; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | rt_incvol(); |
| 120 | else |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 121 | for(i = dev->curvol; i > vol; i--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | rt_decvol(); |
| 123 | |
| 124 | dev->curvol = vol; |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 125 | mutex_unlock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 129 | /* the 128+64 on these outb's is to keep the volume stable while tuning |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | * without them, the volume _will_ creep up with each frequency change |
| 131 | * and bit 4 (+16) is to keep the signal strength meter enabled |
| 132 | */ |
| 133 | |
| 134 | static void send_0_byte(int port, struct rt_device *dev) |
| 135 | { |
| 136 | if ((dev->curvol == 0) || (dev->muted)) { |
| 137 | outb_p(128+64+16+ 1, port); /* wr-enable + data low */ |
| 138 | outb_p(128+64+16+2+1, port); /* clock */ |
| 139 | } |
| 140 | else { |
| 141 | outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */ |
| 142 | outb_p(128+64+16+8+2+1, port); /* clock */ |
| 143 | } |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 144 | sleep_delay(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | static void send_1_byte(int port, struct rt_device *dev) |
| 148 | { |
| 149 | if ((dev->curvol == 0) || (dev->muted)) { |
| 150 | outb_p(128+64+16+4 +1, port); /* wr-enable+data high */ |
| 151 | outb_p(128+64+16+4+2+1, port); /* clock */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | else { |
| 154 | outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */ |
| 155 | outb_p(128+64+16+8+4+2+1, port); /* clock */ |
| 156 | } |
| 157 | |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 158 | sleep_delay(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static int rt_setfreq(struct rt_device *dev, unsigned long freq) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | /* adapted from radio-aztech.c */ |
| 166 | |
| 167 | /* now uses VIDEO_TUNER_LOW for fine tuning */ |
| 168 | |
| 169 | freq += 171200; /* Add 10.7 MHz IF */ |
| 170 | freq /= 800; /* Convert to 50 kHz units */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 171 | |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 172 | mutex_lock(&lock); /* Stop other ops interfering */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | send_0_byte (io, dev); /* 0: LSB of frequency */ |
| 175 | |
| 176 | for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ |
| 177 | if (freq & (1 << i)) |
| 178 | send_1_byte (io, dev); |
| 179 | else |
| 180 | send_0_byte (io, dev); |
| 181 | |
| 182 | send_0_byte (io, dev); /* 14: test bit - always 0 */ |
| 183 | send_0_byte (io, dev); /* 15: test bit - always 0 */ |
| 184 | |
| 185 | send_0_byte (io, dev); /* 16: band data 0 - always 0 */ |
| 186 | send_0_byte (io, dev); /* 17: band data 1 - always 0 */ |
| 187 | send_0_byte (io, dev); /* 18: band data 2 - always 0 */ |
| 188 | send_0_byte (io, dev); /* 19: time base - always 0 */ |
| 189 | |
| 190 | send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */ |
| 191 | send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */ |
| 192 | send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */ |
| 193 | send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */ |
| 194 | |
| 195 | if ((dev->curvol == 0) || (dev->muted)) |
| 196 | outb (0xd0, io); /* volume steady + sigstr */ |
| 197 | else |
| 198 | outb (0xd8, io); /* volume steady + sigstr + on */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 199 | |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 200 | mutex_unlock(&lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static int rt_getsigstr(struct rt_device *dev) |
| 206 | { |
| 207 | if (inb(io) & 2) /* bit set = no signal present */ |
| 208 | return 0; |
| 209 | return 1; /* signal present */ |
| 210 | } |
| 211 | |
| 212 | static int rt_do_ioctl(struct inode *inode, struct file *file, |
| 213 | unsigned int cmd, void *arg) |
| 214 | { |
| 215 | struct video_device *dev = video_devdata(file); |
| 216 | struct rt_device *rt=dev->priv; |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | switch(cmd) |
| 219 | { |
| 220 | case VIDIOCGCAP: |
| 221 | { |
| 222 | struct video_capability *v = arg; |
| 223 | memset(v,0,sizeof(*v)); |
| 224 | v->type=VID_TYPE_TUNER; |
| 225 | v->channels=1; |
| 226 | v->audios=1; |
| 227 | strcpy(v->name, "RadioTrack"); |
| 228 | return 0; |
| 229 | } |
| 230 | case VIDIOCGTUNER: |
| 231 | { |
| 232 | struct video_tuner *v = arg; |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 233 | if(v->tuner) /* Only 1 tuner */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | return -EINVAL; |
| 235 | v->rangelow=(87*16000); |
| 236 | v->rangehigh=(108*16000); |
| 237 | v->flags=VIDEO_TUNER_LOW; |
| 238 | v->mode=VIDEO_MODE_AUTO; |
| 239 | strcpy(v->name, "FM"); |
| 240 | v->signal=0xFFFF*rt_getsigstr(rt); |
| 241 | return 0; |
| 242 | } |
| 243 | case VIDIOCSTUNER: |
| 244 | { |
| 245 | struct video_tuner *v = arg; |
| 246 | if(v->tuner!=0) |
| 247 | return -EINVAL; |
| 248 | /* Only 1 tuner so no setting needed ! */ |
| 249 | return 0; |
| 250 | } |
| 251 | case VIDIOCGFREQ: |
| 252 | { |
| 253 | unsigned long *freq = arg; |
| 254 | *freq = rt->curfreq; |
| 255 | return 0; |
| 256 | } |
| 257 | case VIDIOCSFREQ: |
| 258 | { |
| 259 | unsigned long *freq = arg; |
| 260 | rt->curfreq = *freq; |
| 261 | rt_setfreq(rt, rt->curfreq); |
| 262 | return 0; |
| 263 | } |
| 264 | case VIDIOCGAUDIO: |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 265 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | struct video_audio *v = arg; |
| 267 | memset(v,0, sizeof(*v)); |
| 268 | v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; |
| 269 | v->volume=rt->curvol * 6554; |
| 270 | v->step=6554; |
| 271 | strcpy(v->name, "Radio"); |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 272 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | case VIDIOCSAUDIO: |
| 275 | { |
| 276 | struct video_audio *v = arg; |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 277 | if(v->audio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return -EINVAL; |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 279 | if(v->flags&VIDEO_AUDIO_MUTE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | rt_mute(rt); |
| 281 | else |
| 282 | rt_setvol(rt,v->volume/6554); |
| 283 | return 0; |
| 284 | } |
| 285 | default: |
| 286 | return -ENOIOCTLCMD; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | static int rt_ioctl(struct inode *inode, struct file *file, |
| 291 | unsigned int cmd, unsigned long arg) |
| 292 | { |
| 293 | return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); |
| 294 | } |
| 295 | |
| 296 | static struct rt_device rtrack_unit; |
| 297 | |
| 298 | static struct file_operations rtrack_fops = { |
| 299 | .owner = THIS_MODULE, |
| 300 | .open = video_exclusive_open, |
| 301 | .release = video_exclusive_release, |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 302 | .ioctl = rt_ioctl, |
Arnd Bergmann | 0d0fbf8 | 2006-01-09 15:24:57 -0200 | [diff] [blame] | 303 | .compat_ioctl = v4l_compat_ioctl32, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | .llseek = no_llseek, |
| 305 | }; |
| 306 | |
| 307 | static struct video_device rtrack_radio= |
| 308 | { |
| 309 | .owner = THIS_MODULE, |
| 310 | .name = "RadioTrack radio", |
| 311 | .type = VID_TYPE_TUNER, |
| 312 | .hardware = VID_HARDWARE_RTRACK, |
| 313 | .fops = &rtrack_fops, |
| 314 | }; |
| 315 | |
| 316 | static int __init rtrack_init(void) |
| 317 | { |
| 318 | if(io==-1) |
| 319 | { |
| 320 | printk(KERN_ERR "You must set an I/O address with io=0x???\n"); |
| 321 | return -EINVAL; |
| 322 | } |
| 323 | |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 324 | if (!request_region(io, 2, "rtrack")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | { |
| 326 | printk(KERN_ERR "rtrack: port 0x%x already in use\n", io); |
| 327 | return -EBUSY; |
| 328 | } |
| 329 | |
| 330 | rtrack_radio.priv=&rtrack_unit; |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1) |
| 333 | { |
| 334 | release_region(io, 2); |
| 335 | return -EINVAL; |
| 336 | } |
| 337 | printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n"); |
| 338 | |
| 339 | /* Set up the I/O locking */ |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 340 | |
Ingo Molnar | 3593cab | 2006-02-07 06:49:14 -0200 | [diff] [blame] | 341 | mutex_init(&lock); |
Mauro Carvalho Chehab | 4286c6f | 2006-04-08 16:06:16 -0300 | [diff] [blame] | 342 | |
| 343 | /* mute card - prevents noisy bootups */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | /* this ensures that the volume is all the way down */ |
| 346 | outb(0x48, io); /* volume down but still "on" */ |
| 347 | sleep_delay(2000000); /* make sure it's totally down */ |
| 348 | outb(0xc0, io); /* steady volume, mute card */ |
| 349 | rtrack_unit.curvol = 0; |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | MODULE_AUTHOR("M.Kirkwood"); |
| 355 | MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); |
| 356 | MODULE_LICENSE("GPL"); |
| 357 | |
| 358 | module_param(io, int, 0); |
| 359 | MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)"); |
| 360 | module_param(radio_nr, int, 0); |
| 361 | |
| 362 | static void __exit cleanup_rtrack_module(void) |
| 363 | { |
| 364 | video_unregister_device(&rtrack_radio); |
| 365 | release_region(io,2); |
| 366 | } |
| 367 | |
| 368 | module_init(rtrack_init); |
| 369 | module_exit(cleanup_rtrack_module); |
| 370 | |