/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin * * GemTek hasn't released any specs on the card, so the protocol had to * be reverse engineered with dosemu. * * Besides the protocol changes, this is mostly a copy of: * * RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff * * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood * Converted to new API by Alan Cox * Various bugfixes and enhancements by Russell Kroll * * TODO: Allow for more than one of these foolish entities :-) * */ #include /* Modules */ #include /* Initdata */ #include /* request_region */ #include /* udelay */ #include /* outb, outb_p */ #include /* copy to/from user */ #include /* kernel radio structs */ #include /* CONFIG_RADIO_GEMTEK_PORT */ #include #ifndef CONFIG_RADIO_GEMTEK_PORT #define CONFIG_RADIO_GEMTEK_PORT -1 #endif static int io = CONFIG_RADIO_GEMTEK_PORT; static int radio_nr = -1; static spinlock_t lock; struct gemtek_device { int port; unsigned long curfreq; int muted; }; /* local things */ /* the correct way to mute the gemtek may be to write the last written * frequency || 0x10, but just writing 0x10 once seems to do it as well */ static void gemtek_mute(struct gemtek_device *dev) { if(dev->muted) return; spin_lock(&lock); outb(0x10, io); spin_unlock(&lock); dev->muted = 1; } static void gemtek_unmute(struct gemtek_device *dev) { if(dev->muted == 0) return; spin_lock(&lock); outb(0x20, io); spin_unlock(&lock); dev->muted = 0; } static void zero(void) { outb_p(0x04, io); udelay(5); outb_p(0x05, io); udelay(5); } static void one(void) { outb_p(0x06, io); udelay(5); outb_p(0x07, io); udelay(5); } static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq) { int i; /* freq = 78.25*((float)freq/16000.0 + 10.52); */ freq /= 16; freq += 10520; freq *= 7825; freq /= 100000; spin_lock(&lock); /* 2 start bits */ outb_p(0x03, io); udelay(5); outb_p(0x07, io); udelay(5); /* 28 frequency bits (lsb first) */ for (i = 0; i < 14; i++) if (freq & (1 << i)) one(); else zero(); /* 36 unknown bits */ for (i = 0; i < 11; i++) zero(); one(); for (i = 0; i < 4; i++) zero(); one(); zero(); /* 2 end bits */ outb_p(0x03, io); udelay(5); outb_p(0x07, io); udelay(5); spin_unlock(&lock); return 0; } static int gemtek_getsigstr(struct gemtek_device *dev) { spin_lock(&lock); inb(io); udelay(5); spin_unlock(&lock); if (inb(io) & 8) /* bit set = no signal present */ return 0; return 1; /* signal present */ } static int gemtek_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *dev = video_devdata(file); struct gemtek_device *rt=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, "GemTek"); 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; v->flags=VIDEO_TUNER_LOW; v->mode=VIDEO_MODE_AUTO; v->signal=0xFFFF*gemtek_getsigstr(rt); 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 = rt->curfreq; return 0; } case VIDIOCSFREQ: { unsigned long *freq = arg; rt->curfreq = *freq; /* needs to be called twice in order for getsigstr to work */ gemtek_setfreq(rt, rt->curfreq); gemtek_setfreq(rt, rt->curfreq); return 0; } case VIDIOCGAUDIO: { struct video_audio *v = arg; memset(v,0, sizeof(*v)); v->flags|=VIDEO_AUDIO_MUTABLE; v->volume=1; v->step=65535; strcpy(v->name, "Radio"); return 0; } case VIDIOCSAUDIO: { struct video_audio *v = arg; if(v->audio) return -EINVAL; if(v->flags&VIDEO_AUDIO_MUTE) gemtek_mute(rt); else gemtek_unmute(rt); return 0; } default: return -ENOIOCTLCMD; } } static int gemtek_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl); } static struct gemtek_device gemtek_unit; static struct file_operations gemtek_fops = { .owner = THIS_MODULE, .open = video_exclusive_open, .release = video_exclusive_release, .ioctl = gemtek_ioctl, .compat_ioctl = v4l_compat_ioctl32, .llseek = no_llseek, }; static struct video_device gemtek_radio= { .owner = THIS_MODULE, .name = "GemTek radio", .type = VID_TYPE_TUNER, .hardware = VID_HARDWARE_GEMTEK, .fops = &gemtek_fops, }; static int __init gemtek_init(void) { if(io==-1) { 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"); return -EINVAL; } if (!request_region(io, 4, "gemtek")) { printk(KERN_ERR "gemtek: port 0x%x already in use\n", io); return -EBUSY; } gemtek_radio.priv=&gemtek_unit; if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1) { release_region(io, 4); return -EINVAL; } printk(KERN_INFO "GemTek Radio Card driver.\n"); spin_lock_init(&lock); /* this is _maybe_ unnecessary */ outb(0x01, io); /* mute card - prevents noisy bootups */ gemtek_unit.muted = 0; gemtek_mute(&gemtek_unit); return 0; } MODULE_AUTHOR("Jonas Munsin"); MODULE_DESCRIPTION("A driver for the GemTek Radio Card"); MODULE_LICENSE("GPL"); module_param(io, int, 0); 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))."); module_param(radio_nr, int, 0); static void __exit gemtek_cleanup(void) { video_unregister_device(&gemtek_radio); release_region(io,4); } module_init(gemtek_init); module_exit(gemtek_cleanup); /* Local variables: 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" End: */