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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/aci.c)
* Look there for further info...
*/
/* Revision history:
*
* 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
* 2000-09-05 Robert Siemer <Robert.Siemer@gmx.de>
* removed unfinished volume control (maybe adding it later again)
* use OSS-mixer; added stereo control
*/
/* What ever you think about the ACI, version 0x07 is not very well!
* I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
* conditions... Robert
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include "oss/aci.h"
#include "miropcm20-rds-core.h"
static int radio_nr = -1;
module_param(radio_nr, int, 0);
struct pcm20_device {
unsigned long freq;
int muted;
int stereo;
};
static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
{
dev->muted = mute;
return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
}
static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
{
dev->stereo = stereo;
return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
}
static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
{
unsigned char freql;
unsigned char freqh;
dev->freq=freq;
freq /= 160;
if (!(aci_version==0x07 || aci_version>=0xb0))
freq /= 10; /* I don't know exactly which version
* needs this hack */
freql = freq & 0xff;
freqh = freq >> 8;
aci_rds_cmd(RDS_RESET, NULL, 0);
pcm20_stereo(dev, 1);
return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
}
static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
{
/* okay, check for signal, stereo and rds here... */
int i;
unsigned char buf;
if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
return i;
pr_debug("check_sig: 0x%x\n", i);
if (i & 0x80) {
/* no signal from tuner */
*flags=0;
*signal=0;
return 0;
} else
*signal=0xffff;
if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
return i;
if (i & 0x40) {
*flags=0;
} else {
/* stereo */
*flags=VIDEO_TUNER_STEREO_ON;
/* I can't see stereo, when forced to mono */
dev->stereo=1;
}
if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
return i;
if (buf & 1)
/* RDS available */
*flags|=VIDEO_TUNER_RDS_ON;
else
return 0;
if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
return i;
pr_debug("rds-signal: %d\n", buf);
if (buf > 15) {
printk("miropcm20-radio: RX strengths unexpected high...\n");
buf=15;
}
/* refine signal */
if ((*signal=SCALE(15, 0xffff, buf))==0)
*signal = 1;
return 0;
}
static int pcm20_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct pcm20_device *pcm20 = dev->priv;
int i;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
v->type=VID_TYPE_TUNER;
strcpy(v->name, "Miro PCM20");
v->channels=1;
v->audios=1;
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;
pcm20_getflags(pcm20, &v->flags, &v->signal);
v->flags|=VIDEO_TUNER_LOW;
v->mode=VIDEO_MODE_AUTO;
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 = pcm20->freq;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
pcm20->freq = *freq;
i=pcm20_setfreq(pcm20, pcm20->freq);
pr_debug("First view (setfreq): 0x%x\n", i);
return i;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags=VIDEO_AUDIO_MUTABLE;
if (pcm20->muted)
v->flags|=VIDEO_AUDIO_MUTE;
v->mode=VIDEO_SOUND_STEREO;
if (pcm20->stereo)
v->mode|=VIDEO_SOUND_MONO;
/* v->step=2048; */
strcpy(v->name, "Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE));
if(v->flags&VIDEO_SOUND_MONO)
pcm20_stereo(pcm20, 0);
if(v->flags&VIDEO_SOUND_STEREO)
pcm20_stereo(pcm20, 1);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int pcm20_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl);
}
static struct pcm20_device pcm20_unit = {
.freq = 87*16000,
.muted = 1,
};
static const struct file_operations pcm20_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = pcm20_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device pcm20_radio = {
.owner = THIS_MODULE,
.name = "Miro PCM 20 radio",
.type = VID_TYPE_TUNER,
.fops = &pcm20_fops,
.priv = &pcm20_unit
};
static int __init pcm20_init(void)
{
if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
goto video_register_device;
if(attach_aci_rds()<0)
goto attach_aci_rds;
printk(KERN_INFO "Miro PCM20 radio card driver.\n");
return 0;
attach_aci_rds:
video_unregister_device(&pcm20_radio);
video_register_device:
return -EINVAL;
}
MODULE_AUTHOR("Ruurd Reitsma");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
MODULE_LICENSE("GPL");
static void __exit pcm20_cleanup(void)
{
unload_aci_rds();
video_unregister_device(&pcm20_radio);
}
module_init(pcm20_init);
module_exit(pcm20_cleanup);
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