1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
304 lines
6.4 KiB
C
304 lines
6.4 KiB
C
/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
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*
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* GemTek hasn't released any specs on the card, so the protocol had to
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* be reverse engineered with dosemu.
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*
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* Besides the protocol changes, this is mostly a copy of:
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*
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* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
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*
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* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
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* Converted to new API by Alan Cox <Alan.Cox@linux.org>
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* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
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*
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* TODO: Allow for more than one of these foolish entities :-)
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*
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*/
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* check_region, request_region */
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#include <linux/delay.h> /* udelay */
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#include <asm/io.h> /* outb, outb_p */
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#include <asm/uaccess.h> /* copy to/from user */
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#include <linux/videodev.h> /* kernel radio structs */
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#include <linux/config.h> /* CONFIG_RADIO_GEMTEK_PORT */
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#include <linux/spinlock.h>
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#ifndef CONFIG_RADIO_GEMTEK_PORT
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#define CONFIG_RADIO_GEMTEK_PORT -1
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#endif
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static int io = CONFIG_RADIO_GEMTEK_PORT;
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static int radio_nr = -1;
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static spinlock_t lock;
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struct gemtek_device
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{
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int port;
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unsigned long curfreq;
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int muted;
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};
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/* local things */
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/* the correct way to mute the gemtek may be to write the last written
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* frequency || 0x10, but just writing 0x10 once seems to do it as well
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*/
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static void gemtek_mute(struct gemtek_device *dev)
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{
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if(dev->muted)
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return;
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spin_lock(&lock);
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outb(0x10, io);
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spin_unlock(&lock);
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dev->muted = 1;
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}
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static void gemtek_unmute(struct gemtek_device *dev)
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{
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if(dev->muted == 0)
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return;
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spin_lock(&lock);
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outb(0x20, io);
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spin_unlock(&lock);
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dev->muted = 0;
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}
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static void zero(void)
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{
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outb_p(0x04, io);
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udelay(5);
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outb_p(0x05, io);
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udelay(5);
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}
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static void one(void)
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{
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outb_p(0x06, io);
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udelay(5);
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outb_p(0x07, io);
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udelay(5);
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}
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static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
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{
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int i;
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/* freq = 78.25*((float)freq/16000.0 + 10.52); */
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freq /= 16;
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freq += 10520;
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freq *= 7825;
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freq /= 100000;
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spin_lock(&lock);
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/* 2 start bits */
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outb_p(0x03, io);
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udelay(5);
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outb_p(0x07, io);
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udelay(5);
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/* 28 frequency bits (lsb first) */
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for (i = 0; i < 14; i++)
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if (freq & (1 << i))
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one();
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else
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zero();
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/* 36 unknown bits */
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for (i = 0; i < 11; i++)
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zero();
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one();
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for (i = 0; i < 4; i++)
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zero();
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one();
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zero();
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/* 2 end bits */
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outb_p(0x03, io);
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udelay(5);
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outb_p(0x07, io);
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udelay(5);
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spin_unlock(&lock);
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return 0;
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}
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static int gemtek_getsigstr(struct gemtek_device *dev)
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{
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spin_lock(&lock);
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inb(io);
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udelay(5);
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spin_unlock(&lock);
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if (inb(io) & 8) /* bit set = no signal present */
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return 0;
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return 1; /* signal present */
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}
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static int gemtek_do_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, void *arg)
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{
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struct video_device *dev = video_devdata(file);
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struct gemtek_device *rt=dev->priv;
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switch(cmd)
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{
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case VIDIOCGCAP:
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{
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struct video_capability *v = arg;
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memset(v,0,sizeof(*v));
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v->type=VID_TYPE_TUNER;
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v->channels=1;
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v->audios=1;
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strcpy(v->name, "GemTek");
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return 0;
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}
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case VIDIOCGTUNER:
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{
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struct video_tuner *v = arg;
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if(v->tuner) /* Only 1 tuner */
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return -EINVAL;
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v->rangelow=87*16000;
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v->rangehigh=108*16000;
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v->flags=VIDEO_TUNER_LOW;
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v->mode=VIDEO_MODE_AUTO;
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v->signal=0xFFFF*gemtek_getsigstr(rt);
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strcpy(v->name, "FM");
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return 0;
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}
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case VIDIOCSTUNER:
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{
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struct video_tuner *v = arg;
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if(v->tuner!=0)
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return -EINVAL;
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/* Only 1 tuner so no setting needed ! */
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return 0;
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}
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case VIDIOCGFREQ:
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{
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unsigned long *freq = arg;
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*freq = rt->curfreq;
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return 0;
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}
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case VIDIOCSFREQ:
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{
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unsigned long *freq = arg;
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rt->curfreq = *freq;
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/* needs to be called twice in order for getsigstr to work */
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gemtek_setfreq(rt, rt->curfreq);
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gemtek_setfreq(rt, rt->curfreq);
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return 0;
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}
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case VIDIOCGAUDIO:
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{
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struct video_audio *v = arg;
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memset(v,0, sizeof(*v));
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v->flags|=VIDEO_AUDIO_MUTABLE;
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v->volume=1;
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v->step=65535;
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strcpy(v->name, "Radio");
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return 0;
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}
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case VIDIOCSAUDIO:
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{
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struct video_audio *v = arg;
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if(v->audio)
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return -EINVAL;
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if(v->flags&VIDEO_AUDIO_MUTE)
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gemtek_mute(rt);
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else
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gemtek_unmute(rt);
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return 0;
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}
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default:
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return -ENOIOCTLCMD;
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}
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}
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static int gemtek_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
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}
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static struct gemtek_device gemtek_unit;
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static struct file_operations gemtek_fops = {
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.owner = THIS_MODULE,
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.open = video_exclusive_open,
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.release = video_exclusive_release,
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.ioctl = gemtek_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device gemtek_radio=
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{
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.owner = THIS_MODULE,
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.name = "GemTek radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_GEMTEK,
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.fops = &gemtek_fops,
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};
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static int __init gemtek_init(void)
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{
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if(io==-1)
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{
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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");
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return -EINVAL;
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}
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if (!request_region(io, 4, "gemtek"))
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{
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printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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gemtek_radio.priv=&gemtek_unit;
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if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
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{
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release_region(io, 4);
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return -EINVAL;
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}
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printk(KERN_INFO "GemTek Radio Card driver.\n");
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spin_lock_init(&lock);
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/* this is _maybe_ unnecessary */
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outb(0x01, io);
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/* mute card - prevents noisy bootups */
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gemtek_unit.muted = 0;
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gemtek_mute(&gemtek_unit);
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return 0;
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}
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MODULE_AUTHOR("Jonas Munsin");
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MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
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MODULE_LICENSE("GPL");
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module_param(io, int, 0);
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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)).");
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module_param(radio_nr, int, 0);
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static void __exit gemtek_cleanup(void)
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{
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video_unregister_device(&gemtek_radio);
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release_region(io,4);
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}
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module_init(gemtek_init);
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module_exit(gemtek_cleanup);
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/*
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Local variables:
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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"
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End:
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*/
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