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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 | /* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
*
* GemTek hasn't released any specs on the card, so the protocol had to
* be reverse engineered with dosemu.
*
* Besides the protocol changes, this is mostly a copy of:
*
* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
*
* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
* Converted to new API by Alan Cox <Alan.Cox@linux.org>
* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
*
* TODO: Allow for more than one of these foolish entities :-)
*
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <asm/io.h> /* outb, outb_p */
#include <asm/uaccess.h> /* copy to/from user */
#include <linux/videodev.h> /* kernel radio structs */
#include <linux/config.h> /* CONFIG_RADIO_GEMTEK_PORT */
#include <linux/spinlock.h>
#ifndef CONFIG_RADIO_GEMTEK_PORT
#define CONFIG_RADIO_GEMTEK_PORT -1
#endif
static int io = CONFIG_RADIO_GEMTEK_PORT;
static int radio_nr = -1;
static spinlock_t lock;
struct gemtek_device
{
int port;
unsigned long curfreq;
int muted;
};
/* local things */
/* the correct way to mute the gemtek may be to write the last written
* frequency || 0x10, but just writing 0x10 once seems to do it as well
*/
static void gemtek_mute(struct gemtek_device *dev)
{
if(dev->muted)
return;
spin_lock(&lock);
outb(0x10, io);
spin_unlock(&lock);
dev->muted = 1;
}
static void gemtek_unmute(struct gemtek_device *dev)
{
if(dev->muted == 0)
return;
spin_lock(&lock);
outb(0x20, io);
spin_unlock(&lock);
dev->muted = 0;
}
static void zero(void)
{
outb_p(0x04, io);
udelay(5);
outb_p(0x05, io);
udelay(5);
}
static void one(void)
{
outb_p(0x06, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
}
static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
{
int i;
/* freq = 78.25*((float)freq/16000.0 + 10.52); */
freq /= 16;
freq += 10520;
freq *= 7825;
freq /= 100000;
spin_lock(&lock);
/* 2 start bits */
outb_p(0x03, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
/* 28 frequency bits (lsb first) */
for (i = 0; i < 14; i++)
if (freq & (1 << i))
one();
else
zero();
/* 36 unknown bits */
for (i = 0; i < 11; i++)
zero();
one();
for (i = 0; i < 4; i++)
zero();
one();
zero();
/* 2 end bits */
outb_p(0x03, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
spin_unlock(&lock);
return 0;
}
static int gemtek_getsigstr(struct gemtek_device *dev)
{
spin_lock(&lock);
inb(io);
udelay(5);
spin_unlock(&lock);
if (inb(io) & 8) /* bit set = no signal present */
return 0;
return 1; /* signal present */
}
static int gemtek_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct gemtek_device *rt=dev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
v->type=VID_TYPE_TUNER;
v->channels=1;
v->audios=1;
strcpy(v->name, "GemTek");
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
if(v->tuner) /* Only 1 tuner */
return -EINVAL;
v->rangelow=87*16000;
v->rangehigh=108*16000;
v->flags=VIDEO_TUNER_LOW;
v->mode=VIDEO_MODE_AUTO;
v->signal=0xFFFF*gemtek_getsigstr(rt);
strcpy(v->name, "FM");
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *v = arg;
if(v->tuner!=0)
return -EINVAL;
/* Only 1 tuner so no setting needed ! */
return 0;
}
case VIDIOCGFREQ:
{
unsigned long *freq = arg;
*freq = rt->curfreq;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
rt->curfreq = *freq;
/* needs to be called twice in order for getsigstr to work */
gemtek_setfreq(rt, rt->curfreq);
gemtek_setfreq(rt, rt->curfreq);
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags|=VIDEO_AUDIO_MUTABLE;
v->volume=1;
v->step=65535;
strcpy(v->name, "Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
if(v->flags&VIDEO_AUDIO_MUTE)
gemtek_mute(rt);
else
gemtek_unmute(rt);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int gemtek_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
}
static struct gemtek_device gemtek_unit;
static struct file_operations gemtek_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = gemtek_ioctl,
.llseek = no_llseek,
};
static struct video_device gemtek_radio=
{
.owner = THIS_MODULE,
.name = "GemTek radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_GEMTEK,
.fops = &gemtek_fops,
};
static int __init gemtek_init(void)
{
if(io==-1)
{
printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
return -EINVAL;
}
if (!request_region(io, 4, "gemtek"))
{
printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
return -EBUSY;
}
gemtek_radio.priv=&gemtek_unit;
if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 4);
return -EINVAL;
}
printk(KERN_INFO "GemTek Radio Card driver.\n");
spin_lock_init(&lock);
/* this is _maybe_ unnecessary */
outb(0x01, io);
/* mute card - prevents noisy bootups */
gemtek_unit.muted = 0;
gemtek_mute(&gemtek_unit);
return 0;
}
MODULE_AUTHOR("Jonas Munsin");
MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
module_param(radio_nr, int, 0);
static void __exit gemtek_cleanup(void)
{
video_unregister_device(&gemtek_radio);
release_region(io,4);
}
module_init(gemtek_init);
module_exit(gemtek_cleanup);
/*
Local variables:
compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
End:
*/
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