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/* radio-aztech.c - Aztech radio card driver for Linux 2.2
*
* Adapted to support the Video for Linux API by
* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
*
* Quay Ly
* Donald Song
* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
*
* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
* along with more information on the card itself.
*
* History:
* 1999-02-24 Russell Kroll <rkroll@exploits.org>
* Fine tuning/VIDEO_TUNER_LOW
* Range expanded to 87-108 MHz (from 87.9-107.8)
*
* Notable changes from the original source:
* - includes stripped down to the essentials
* - for loops used as delays replaced with udelay()
* - #defines removed, changed to static values
* - tuning structure changed - no more character arrays, other changes
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* check_region, 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_AZTECH_PORT */
/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
#ifndef CONFIG_RADIO_AZTECH_PORT
#define CONFIG_RADIO_AZTECH_PORT -1
#endif
static int io = CONFIG_RADIO_AZTECH_PORT;
static int radio_nr = -1;
static int radio_wait_time = 1000;
static int users = 0;
static struct semaphore lock;
struct az_device
{
int curvol;
unsigned long curfreq;
int stereo;
};
static int volconvert(int level)
{
level>>=14; /* Map 16bits down to 2 bit */
level&=3;
/* convert to card-friendly values */
switch (level)
{
case 0:
return 0;
case 1:
return 1;
case 2:
return 4;
case 3:
return 5;
}
return 0; /* Quieten gcc */
}
static void send_0_byte (struct az_device *dev)
{
udelay(radio_wait_time);
outb_p(2+volconvert(dev->curvol), io);
outb_p(64+2+volconvert(dev->curvol), io);
}
static void send_1_byte (struct az_device *dev)
{
udelay (radio_wait_time);
outb_p(128+2+volconvert(dev->curvol), io);
outb_p(128+64+2+volconvert(dev->curvol), io);
}
static int az_setvol(struct az_device *dev, int vol)
{
down(&lock);
outb (volconvert(vol), io);
up(&lock);
return 0;
}
/* thanks to Michael Dwyer for giving me a dose of clues in
* the signal strength department..
*
* This card has a stereo bit - bit 0 set = mono, not set = stereo
* It also has a "signal" bit - bit 1 set = bad signal, not set = good
*
*/
static int az_getsigstr(struct az_device *dev)
{
if (inb(io) & 2) /* bit set = no signal present */
return 0;
return 1; /* signal present */
}
static int az_getstereo(struct az_device *dev)
{
if (inb(io) & 1) /* bit set = mono */
return 0;
return 1; /* stereo */
}
static int az_setfreq(struct az_device *dev, unsigned long frequency)
{
int i;
frequency += 171200; /* Add 10.7 MHz IF */
frequency /= 800; /* Convert to 50 kHz units */
down(&lock);
send_0_byte (dev); /* 0: LSB of frequency */
for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
if (frequency & (1 << i))
send_1_byte (dev);
else
send_0_byte (dev);
send_0_byte (dev); /* 14: test bit - always 0 */
send_0_byte (dev); /* 15: test bit - always 0 */
send_0_byte (dev); /* 16: band data 0 - always 0 */
if (dev->stereo) /* 17: stereo (1 to enable) */
send_1_byte (dev);
else
send_0_byte (dev);
send_1_byte (dev); /* 18: band data 1 - unknown */
send_0_byte (dev); /* 19: time base - always 0 */
send_0_byte (dev); /* 20: spacing (0 = 25 kHz) */
send_1_byte (dev); /* 21: spacing (1 = 25 kHz) */
send_0_byte (dev); /* 22: spacing (0 = 25 kHz) */
send_1_byte (dev); /* 23: AM/FM (FM = 1, always) */
/* latch frequency */
udelay (radio_wait_time);
outb_p(128+64+volconvert(dev->curvol), io);
up(&lock);
return 0;
}
static int az_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct az_device *az=dev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability v;
v.type=VID_TYPE_TUNER;
v.channels=1;
v.audios=1;
/* No we don't do pictures */
v.maxwidth=0;
v.maxheight=0;
v.minwidth=0;
v.minheight=0;
strcpy(v.name, "Aztech Radio");
if(copy_to_user(arg,&v,sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner v;
if(copy_from_user(&v, arg,sizeof(v))!=0)
return -EFAULT;
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*az_getsigstr(az);
if(az_getstereo(az))
v.flags|=VIDEO_TUNER_STEREO_ON;
strcpy(v.name, "FM");
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.tuner!=0)
return -EINVAL;
/* Only 1 tuner so no setting needed ! */
return 0;
}
case VIDIOCGFREQ:
if(copy_to_user(arg, &az->curfreq, sizeof(az->curfreq)))
return -EFAULT;
return 0;
case VIDIOCSFREQ:
if(copy_from_user(&az->curfreq, arg,sizeof(az->curfreq)))
return -EFAULT;
az_setfreq(az, az->curfreq);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v,0, sizeof(v));
v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
if(az->stereo)
v.mode=VIDEO_SOUND_STEREO;
else
v.mode=VIDEO_SOUND_MONO;
v.volume=az->curvol;
v.step=16384;
strcpy(v.name, "Radio");
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.audio)
return -EINVAL;
az->curvol=v.volume;
az->stereo=(v.mode&VIDEO_SOUND_STEREO)?1:0;
if(v.flags&VIDEO_AUDIO_MUTE)
az_setvol(az,0);
else
az_setvol(az,az->curvol);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int az_open(struct video_device *dev, int flags)
{
if(users)
return -EBUSY;
users++;
return 0;
}
static void az_close(struct video_device *dev)
{
users--;
}
static struct az_device aztech_unit;
static struct video_device aztech_radio=
{
owner: THIS_MODULE,
name: "Aztech radio",
type: VID_TYPE_TUNER,
hardware: VID_HARDWARE_AZTECH,
open: az_open,
close: az_close,
ioctl: az_ioctl,
};
static int __init aztech_init(void)
{
if(io==-1)
{
printk(KERN_ERR "You must set an I/O address with io=0x???\n");
return -EINVAL;
}
if (!request_region(io, 2, "aztech"))
{
printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
return -EBUSY;
}
init_MUTEX(&lock);
aztech_radio.priv=&aztech_unit;
if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io,2);
return -EINVAL;
}
printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
/* mute card - prevents noisy bootups */
outb (0, io);
return 0;
}
MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Aztech radio card.");
MODULE_LICENSE("GPL");
MODULE_PARM(io, "i");
MODULE_PARM(radio_nr, "i");
MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
EXPORT_NO_SYMBOLS;
static void __exit aztech_cleanup(void)
{
video_unregister_device(&aztech_radio);
release_region(io,2);
}
module_init(aztech_init);
module_exit(aztech_cleanup);
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