diff options
Diffstat (limited to 'drivers/media/radio/radio-rtrack2.c')
| -rw-r--r-- | drivers/media/radio/radio-rtrack2.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-rtrack2.c b/drivers/media/radio/radio-rtrack2.c new file mode 100644 index 000000000000..c00245d4d249 --- /dev/null +++ b/drivers/media/radio/radio-rtrack2.c @@ -0,0 +1,266 @@ +/* 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 <Alan.Cox@linux.org> + * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> + * + * TODO: Allow for more than one of these foolish entities :-) + * + */ + +#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_RTRACK2_PORT */ +#include <linux/spinlock.h> + +#ifndef CONFIG_RADIO_RTRACK2_PORT +#define CONFIG_RADIO_RTRACK2_PORT -1 +#endif + +static int io = CONFIG_RADIO_RTRACK2_PORT; +static int radio_nr = -1; +static spinlock_t lock; + +struct rt_device +{ + int port; + unsigned long curfreq; + int muted; +}; + + +/* local things */ + +static void rt_mute(struct rt_device *dev) +{ + if(dev->muted) + return; + spin_lock(&lock); + outb(1, io); + spin_unlock(&lock); + dev->muted = 1; +} + +static void rt_unmute(struct rt_device *dev) +{ + if(dev->muted == 0) + return; + spin_lock(&lock); + outb(0, io); + spin_unlock(&lock); + dev->muted = 0; +} + +static void zero(void) +{ + outb_p(1, io); + outb_p(3, io); + outb_p(1, io); +} + +static void one(void) +{ + outb_p(5, io); + outb_p(7, io); + outb_p(5, io); +} + +static int rt_setfreq(struct rt_device *dev, unsigned long freq) +{ + int i; + + freq = freq / 200 + 856; + + spin_lock(&lock); + + outb_p(0xc8, io); + outb_p(0xc9, io); + outb_p(0xc9, io); + + for (i = 0; i < 10; i++) + zero (); + + for (i = 14; i >= 0; i--) + if (freq & (1 << i)) + one (); + else + zero (); + + outb_p(0xc8, io); + if (!dev->muted) + outb_p(0, io); + + spin_unlock(&lock); + return 0; +} + +static int rt_getsigstr(struct rt_device *dev) +{ + if (inb(io) & 2) /* bit set = no signal present */ + return 0; + return 1; /* signal present */ +} + +static int rt_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *dev = video_devdata(file); + struct rt_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, "RadioTrack II"); + return 0; + } + case VIDIOCGTUNER: + { + struct video_tuner *v = arg; + if(v->tuner) /* Only 1 tuner */ + return -EINVAL; + v->rangelow=88*16000; + v->rangehigh=108*16000; + v->flags=VIDEO_TUNER_LOW; + v->mode=VIDEO_MODE_AUTO; + v->signal=0xFFFF*rt_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; + rt_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) + rt_mute(rt); + else + rt_unmute(rt); + + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +static int rt_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); +} + +static struct rt_device rtrack2_unit; + +static struct file_operations rtrack2_fops = { + .owner = THIS_MODULE, + .open = video_exclusive_open, + .release = video_exclusive_release, + .ioctl = rt_ioctl, + .llseek = no_llseek, +}; + +static struct video_device rtrack2_radio= +{ + .owner = THIS_MODULE, + .name = "RadioTrack II radio", + .type = VID_TYPE_TUNER, + .hardware = VID_HARDWARE_RTRACK2, + .fops = &rtrack2_fops, +}; + +static int __init rtrack2_init(void) +{ + if(io==-1) + { + printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n"); + return -EINVAL; + } + if (!request_region(io, 4, "rtrack2")) + { + printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io); + return -EBUSY; + } + + rtrack2_radio.priv=&rtrack2_unit; + + spin_lock_init(&lock); + if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1) + { + release_region(io, 4); + return -EINVAL; + } + + printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n"); + + /* mute card - prevents noisy bootups */ + outb(1, io); + rtrack2_unit.muted = 1; + + return 0; +} + +MODULE_AUTHOR("Ben Pfaff"); +MODULE_DESCRIPTION("A driver for the RadioTrack II radio card."); +MODULE_LICENSE("GPL"); + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)"); +module_param(radio_nr, int, 0); + +static void __exit rtrack2_cleanup_module(void) +{ + video_unregister_device(&rtrack2_radio); + release_region(io,4); +} + +module_init(rtrack2_init); +module_exit(rtrack2_cleanup_module); + +/* + Local variables: + compile-command: "mmake" + End: +*/ |