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/* Miro PCM20 radio driver for Linux radio support
* (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
* Thanks to Norberto Pellici for the ACI device interface specification
* The API part is based on the radiotrack driver by M. Kirkwood
* This driver relies on the aci mixer (drivers/sound/lowlevel/aci.c)
* Look there for further info...
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <asm/uaccess.h> /* copy to/from user */
#include <linux/videodev.h> /* kernel radio structs */
#include "../sound/lowlevel/miroaci.h" /* ACI Control by acimixer */
static int users = 0;
struct pcm20_device
{
int port;
int curvol;
unsigned long curfreq;
int muted;
};
/* local things */
static void pcm20_mute(struct pcm20_device *dev)
{
dev->muted = 1;
aci_write_cmd(0xa3,0x01);
}
static int pcm20_setvol(struct pcm20_device *dev, int vol)
{
if(vol == dev->curvol) { /* requested volume = current */
if (dev->muted) { /* user is unmuting the card */
dev->muted = 0;
aci_write_cmd(0xa3,0x00); /* enable card */
}
return 0;
}
if(vol == 0) { /* volume = 0 means mute the card */
aci_write_cmd(0x3d, 0x20);
aci_write_cmd(0x35, 0x20);
return 0;
}
dev->muted = 0;
aci_write_cmd(0x3d, 32-vol); /* Right Channel */
aci_write_cmd(0x35, 32-vol); /* Left Channel */
dev->curvol = vol;
return 0;
}
static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
{
unsigned char freql;
unsigned char freqh;
freq = (freq * 10) / 16;
freql = freq & 0xff;
freqh = freq >> 8;
aci_write_cmd_d(0xa7, freql, freqh); /* Tune to frequency */
return 0;
}
int pcm20_getsigstr(struct pcm20_device *dev)
{
unsigned char buf;
aci_indexed_cmd(0xf0, 0x32, &buf);
if ((buf & 0x80) == 0x80)
return 0;
return 1; /* signal present */
}
static int pcm20_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct pcm20_device *pcm20=dev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability v;
v.type=VID_TYPE_TUNER;
strcpy(v.name, "Miro PCM20");
v.channels=1;
v.audios=1;
/* No we don't do pictures */
v.maxwidth=0;
v.maxheight=0;
v.minwidth=0;
v.minheight=0;
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=(int)(87.5*16);
v.rangehigh=(int)(108.0*16);
v.flags=0;
v.mode=VIDEO_MODE_AUTO;
v.signal=0xFFFF*pcm20_getsigstr(pcm20);
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, &pcm20->curfreq, sizeof(pcm20->curfreq)))
return -EFAULT;
return 0;
case VIDIOCSFREQ:
if(copy_from_user(&pcm20->curfreq, arg,sizeof(pcm20->curfreq)))
return -EFAULT;
pcm20_setfreq(pcm20, pcm20->curfreq);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v,0, sizeof(v));
v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
v.volume=pcm20->curvol * 2048;
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;
if(v.flags&VIDEO_AUDIO_MUTE)
pcm20_mute(pcm20);
else
pcm20_setvol(pcm20,v.volume/2048);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int pcm20_open(struct video_device *dev, int flags)
{
if(users)
return -EBUSY;
users++;
MOD_INC_USE_COUNT;
return 0;
}
static void pcm20_close(struct video_device *dev)
{
users--;
MOD_DEC_USE_COUNT;
}
static struct pcm20_device pcm20_unit;
static struct video_device pcm20_radio=
{
"Miro PCM 20 radio",
VID_TYPE_TUNER,
VID_HARDWARE_RTRACK,
pcm20_open,
pcm20_close,
NULL, /* Can't read (no capture ability) */
NULL, /* Can't write */
NULL, /* Can't poll */
pcm20_ioctl,
NULL,
NULL
};
static int __init pcm20_init(void)
{
pcm20_radio.priv=&pcm20_unit;
if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO)==-1)
return -EINVAL;
printk(KERN_INFO "Miro PCM20 radio card driver.\n");
/* mute card - prevents noisy bootups */
/* this ensures that the volume is all the way down */
pcm20_unit.curvol = 0;
return 0;
}
MODULE_AUTHOR("Ruurd Reitsma");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
EXPORT_NO_SYMBOLS;
static void __exit pcm20_cleanup(void)
{
video_unregister_device(&pcm20_radio);
}
module_init(pcm20_init);
module_exit(pcm20_cleanup);
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