384 lines
10 KiB
C
384 lines
10 KiB
C
/* Typhoon Radio Card driver for radio support
|
|
* (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
|
|
*
|
|
* Card manufacturer:
|
|
* http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
|
|
*
|
|
* Notes on the hardware
|
|
*
|
|
* This card has two output sockets, one for speakers and one for line.
|
|
* The speaker output has volume control, but only in four discrete
|
|
* steps. The line output has neither volume control nor mute.
|
|
*
|
|
* The card has auto-stereo according to its manual, although it all
|
|
* sounds mono to me (even with the Win/DOS drivers). Maybe it's my
|
|
* antenna - I really don't know for sure.
|
|
*
|
|
* Frequency control is done digitally.
|
|
*
|
|
* Volume control is done digitally, but there are only four different
|
|
* possible values. So you should better always turn the volume up and
|
|
* use line control. I got the best results by connecting line output
|
|
* to the sound card microphone input. For such a configuration the
|
|
* volume control has no effect, since volume control only influences
|
|
* the speaker output.
|
|
*
|
|
* There is no explicit mute/unmute. So I set the radio frequency to a
|
|
* value where I do expect just noise and turn the speaker volume down.
|
|
* The frequency change is necessary since the card never seems to be
|
|
* completely silent.
|
|
*/
|
|
|
|
#include <linux/module.h> /* Modules */
|
|
#include <linux/init.h> /* Initdata */
|
|
#include <linux/ioport.h> /* check_region, request_region */
|
|
#include <linux/proc_fs.h> /* radio card status report */
|
|
#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_TYPHOON_* */
|
|
|
|
#define BANNER "Typhoon Radio Card driver v0.1\n"
|
|
|
|
#ifndef CONFIG_RADIO_TYPHOON_PORT
|
|
#define CONFIG_RADIO_TYPHOON_PORT -1
|
|
#endif
|
|
|
|
#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
|
|
#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
|
|
#endif
|
|
|
|
#ifndef CONFIG_PROC_FS
|
|
#undef CONFIG_RADIO_TYPHOON_PROC_FS
|
|
#endif
|
|
|
|
struct typhoon_device {
|
|
int users;
|
|
int iobase;
|
|
int curvol;
|
|
int muted;
|
|
unsigned long curfreq;
|
|
unsigned long mutefreq;
|
|
struct semaphore lock;
|
|
};
|
|
|
|
static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
|
|
static int typhoon_setfreq_generic(struct typhoon_device *dev,
|
|
unsigned long frequency);
|
|
static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
|
|
static void typhoon_mute(struct typhoon_device *dev);
|
|
static void typhoon_unmute(struct typhoon_device *dev);
|
|
static int typhoon_setvol(struct typhoon_device *dev, int vol);
|
|
static int typhoon_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg);
|
|
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
|
|
static int typhoon_get_info(char *buf, char **start, off_t offset, int len);
|
|
#endif
|
|
|
|
static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
|
|
{
|
|
down(&dev->lock);
|
|
vol >>= 14; /* Map 16 bit to 2 bit */
|
|
vol &= 3;
|
|
outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
|
|
outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
|
|
up(&dev->lock);
|
|
}
|
|
|
|
static int typhoon_setfreq_generic(struct typhoon_device *dev,
|
|
unsigned long frequency)
|
|
{
|
|
unsigned long outval;
|
|
unsigned long x;
|
|
|
|
/*
|
|
* The frequency transfer curve is not linear. The best fit I could
|
|
* get is
|
|
*
|
|
* outval = -155 + exp((f + 15.55) * 0.057))
|
|
*
|
|
* where frequency f is in MHz. Since we don't have exp in the kernel,
|
|
* I approximate this function by a third order polynomial.
|
|
*
|
|
*/
|
|
|
|
down(&dev->lock);
|
|
x = frequency / 160;
|
|
outval = (x * x + 2500) / 5000;
|
|
outval = (outval * x + 5000) / 10000;
|
|
outval -= (10 * x * x + 10433) / 20866;
|
|
outval += 4 * x - 11505;
|
|
|
|
outb_p((outval >> 8) & 0x01, dev->iobase + 4);
|
|
outb_p(outval >> 9, dev->iobase + 6);
|
|
outb_p(outval & 0xff, dev->iobase + 8);
|
|
up(&dev->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
|
|
{
|
|
typhoon_setfreq_generic(dev, frequency);
|
|
dev->curfreq = frequency;
|
|
return 0;
|
|
}
|
|
|
|
static void typhoon_mute(struct typhoon_device *dev)
|
|
{
|
|
if (dev->muted == 1)
|
|
return;
|
|
typhoon_setvol_generic(dev, 0);
|
|
typhoon_setfreq_generic(dev, dev->mutefreq);
|
|
dev->muted = 1;
|
|
}
|
|
|
|
static void typhoon_unmute(struct typhoon_device *dev)
|
|
{
|
|
if (dev->muted == 0)
|
|
return;
|
|
typhoon_setfreq_generic(dev, dev->curfreq);
|
|
typhoon_setvol_generic(dev, dev->curvol);
|
|
dev->muted = 0;
|
|
}
|
|
|
|
static int typhoon_setvol(struct typhoon_device *dev, int vol)
|
|
{
|
|
if (dev->muted && vol != 0) { /* user is unmuting the card */
|
|
dev->curvol = vol;
|
|
typhoon_unmute(dev);
|
|
return 0;
|
|
}
|
|
if (vol == dev->curvol) /* requested volume == current */
|
|
return 0;
|
|
|
|
if (vol == 0) { /* volume == 0 means mute the card */
|
|
typhoon_mute(dev);
|
|
dev->curvol = vol;
|
|
return 0;
|
|
}
|
|
typhoon_setvol_generic(dev, vol);
|
|
dev->curvol = vol;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int typhoon_do_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, void *arg)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct typhoon_device *typhoon = 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, "Typhoon Radio");
|
|
return 0;
|
|
}
|
|
case VIDIOCGTUNER:
|
|
{
|
|
struct video_tuner *v = arg;
|
|
if (v->tuner) /* Only 1 tuner */
|
|
return -EINVAL;
|
|
v->rangelow = 875 * 1600;
|
|
v->rangehigh = 1080 * 1600;
|
|
v->flags = VIDEO_TUNER_LOW;
|
|
v->mode = VIDEO_MODE_AUTO;
|
|
v->signal = 0xFFFF; /* We can't get the signal strength */
|
|
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 = typhoon->curfreq;
|
|
return 0;
|
|
}
|
|
case VIDIOCSFREQ:
|
|
{
|
|
unsigned long *freq = arg;
|
|
typhoon->curfreq = *freq;
|
|
typhoon_setfreq(typhoon, typhoon->curfreq);
|
|
return 0;
|
|
}
|
|
case VIDIOCGAUDIO:
|
|
{
|
|
struct video_audio *v = arg;
|
|
memset(v, 0, sizeof(*v));
|
|
v->flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
|
|
v->mode |= VIDEO_SOUND_MONO;
|
|
v->volume = typhoon->curvol;
|
|
v->step = 1 << 14;
|
|
strcpy(v->name, "Typhoon Radio");
|
|
return 0;
|
|
}
|
|
case VIDIOCSAUDIO:
|
|
{
|
|
struct video_audio *v = arg;
|
|
if (v->audio)
|
|
return -EINVAL;
|
|
if (v->flags & VIDEO_AUDIO_MUTE)
|
|
typhoon_mute(typhoon);
|
|
else
|
|
typhoon_unmute(typhoon);
|
|
if (v->flags & VIDEO_AUDIO_VOLUME)
|
|
typhoon_setvol(typhoon, v->volume);
|
|
return 0;
|
|
}
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static int typhoon_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return video_usercopy(inode, file, cmd, arg, typhoon_do_ioctl);
|
|
}
|
|
|
|
static struct typhoon_device typhoon_unit =
|
|
{
|
|
.iobase = CONFIG_RADIO_TYPHOON_PORT,
|
|
.curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
|
|
.mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
|
|
};
|
|
|
|
static struct file_operations typhoon_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = video_exclusive_open,
|
|
.release = video_exclusive_release,
|
|
.ioctl = typhoon_ioctl,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct video_device typhoon_radio =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.name = "Typhoon Radio",
|
|
.type = VID_TYPE_TUNER,
|
|
.hardware = VID_HARDWARE_TYPHOON,
|
|
.fops = &typhoon_fops,
|
|
};
|
|
|
|
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
|
|
|
|
static int typhoon_get_info(char *buf, char **start, off_t offset, int len)
|
|
{
|
|
char *out = buf;
|
|
|
|
#ifdef MODULE
|
|
#define MODULEPROCSTRING "Driver loaded as a module"
|
|
#else
|
|
#define MODULEPROCSTRING "Driver compiled into kernel"
|
|
#endif
|
|
|
|
/* output must be kept under PAGE_SIZE */
|
|
out += sprintf(out, BANNER);
|
|
out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n");
|
|
out += sprintf(out, "frequency = %lu kHz\n",
|
|
typhoon_unit.curfreq >> 4);
|
|
out += sprintf(out, "volume = %d\n", typhoon_unit.curvol);
|
|
out += sprintf(out, "mute = %s\n", typhoon_unit.muted ?
|
|
"on" : "off");
|
|
out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase);
|
|
out += sprintf(out, "mute frequency = %lu kHz\n",
|
|
typhoon_unit.mutefreq >> 4);
|
|
return out - buf;
|
|
}
|
|
|
|
#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
|
|
|
|
MODULE_AUTHOR("Dr. Henrik Seidel");
|
|
MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int io = -1;
|
|
static int radio_nr = -1;
|
|
|
|
module_param(io, int, 0);
|
|
MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
|
|
module_param(radio_nr, int, 0);
|
|
|
|
#ifdef MODULE
|
|
static unsigned long mutefreq = 0;
|
|
module_param(mutefreq, ulong, 0);
|
|
MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
|
|
#endif
|
|
|
|
static int __init typhoon_init(void)
|
|
{
|
|
#ifdef MODULE
|
|
if (io == -1) {
|
|
printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
|
|
return -EINVAL;
|
|
}
|
|
typhoon_unit.iobase = io;
|
|
|
|
if (mutefreq < 87000 || mutefreq > 108500) {
|
|
printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
|
|
printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
|
|
return -EINVAL;
|
|
}
|
|
typhoon_unit.mutefreq = mutefreq;
|
|
#endif /* MODULE */
|
|
|
|
printk(KERN_INFO BANNER);
|
|
init_MUTEX(&typhoon_unit.lock);
|
|
io = typhoon_unit.iobase;
|
|
if (!request_region(io, 8, "typhoon")) {
|
|
printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
|
|
typhoon_unit.iobase);
|
|
return -EBUSY;
|
|
}
|
|
|
|
typhoon_radio.priv = &typhoon_unit;
|
|
if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
|
|
{
|
|
release_region(io, 8);
|
|
return -EINVAL;
|
|
}
|
|
printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
|
|
printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
|
|
typhoon_unit.mutefreq);
|
|
typhoon_unit.mutefreq <<= 4;
|
|
|
|
/* mute card - prevents noisy bootups */
|
|
typhoon_mute(&typhoon_unit);
|
|
|
|
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
|
|
if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL,
|
|
typhoon_get_info))
|
|
printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit typhoon_cleanup_module(void)
|
|
{
|
|
|
|
#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
|
|
remove_proc_entry("driver/radio-typhoon", NULL);
|
|
#endif
|
|
|
|
video_unregister_device(&typhoon_radio);
|
|
release_region(io, 8);
|
|
}
|
|
|
|
module_init(typhoon_init);
|
|
module_exit(typhoon_cleanup_module);
|
|
|