| /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card |
| * |
| * by Fred Gleason <fredg@wava.com> |
| * Version 0.3.3 |
| * |
| * (Loosely) based on code for the Aztech radio card by |
| * |
| * Russell Kroll (rkroll@exploits.org) |
| * Quay Ly |
| * Donald Song |
| * Jason Lewis (jlewis@twilight.vtc.vsc.edu) |
| * Scott McGrath (smcgrath@twilight.vtc.vsc.edu) |
| * William McGrath (wmcgrath@twilight.vtc.vsc.edu) |
| * |
| * History: |
| * 2000-04-29 Russell Kroll <rkroll@exploits.org> |
| * Added ISAPnP detection for Linux 2.3/2.4 |
| * |
| * 2001-01-10 Russell Kroll <rkroll@exploits.org> |
| * Removed dead CONFIG_RADIO_CADET_PORT code |
| * PnP detection on load is now default (no args necessary) |
| * |
| * 2002-01-17 Adam Belay <ambx1@neo.rr.com> |
| * Updated to latest pnp code |
| * |
| * 2003-01-31 Alan Cox <alan@redhat.com> |
| * Cleaned up locking, delay code, general odds and ends |
| */ |
| |
| #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/param.h> |
| #include <linux/pnp.h> |
| |
| #define RDS_BUFFER 256 |
| |
| static int io=-1; /* default to isapnp activation */ |
| static int radio_nr = -1; |
| static int users=0; |
| static int curtuner=0; |
| static int tunestat=0; |
| static int sigstrength=0; |
| static wait_queue_head_t read_queue; |
| static struct timer_list readtimer; |
| static __u8 rdsin=0,rdsout=0,rdsstat=0; |
| static unsigned char rdsbuf[RDS_BUFFER]; |
| static spinlock_t cadet_io_lock; |
| |
| static int cadet_probe(void); |
| |
| /* |
| * Signal Strength Threshold Values |
| * The V4L API spec does not define any particular unit for the signal |
| * strength value. These values are in microvolts of RF at the tuner's input. |
| */ |
| static __u16 sigtable[2][4]={{5,10,30,150},{28,40,63,1000}}; |
| |
| static int cadet_getrds(void) |
| { |
| int rdsstat=0; |
| |
| spin_lock(&cadet_io_lock); |
| outb(3,io); /* Select Decoder Control/Status */ |
| outb(inb(io+1)&0x7f,io+1); /* Reset RDS detection */ |
| spin_unlock(&cadet_io_lock); |
| |
| msleep(100); |
| |
| spin_lock(&cadet_io_lock); |
| outb(3,io); /* Select Decoder Control/Status */ |
| if((inb(io+1)&0x80)!=0) { |
| rdsstat|=VIDEO_TUNER_RDS_ON; |
| } |
| if((inb(io+1)&0x10)!=0) { |
| rdsstat|=VIDEO_TUNER_MBS_ON; |
| } |
| spin_unlock(&cadet_io_lock); |
| return rdsstat; |
| } |
| |
| static int cadet_getstereo(void) |
| { |
| int ret = 0; |
| if(curtuner != 0) /* Only FM has stereo capability! */ |
| return 0; |
| |
| spin_lock(&cadet_io_lock); |
| outb(7,io); /* Select tuner control */ |
| if( (inb(io+1) & 0x40) == 0) |
| ret = 1; |
| spin_unlock(&cadet_io_lock); |
| return ret; |
| } |
| |
| static unsigned cadet_gettune(void) |
| { |
| int curvol,i; |
| unsigned fifo=0; |
| |
| /* |
| * Prepare for read |
| */ |
| |
| spin_lock(&cadet_io_lock); |
| |
| outb(7,io); /* Select tuner control */ |
| curvol=inb(io+1); /* Save current volume/mute setting */ |
| outb(0x00,io+1); /* Ensure WRITE-ENABLE is LOW */ |
| tunestat=0xffff; |
| |
| /* |
| * Read the shift register |
| */ |
| for(i=0;i<25;i++) { |
| fifo=(fifo<<1)|((inb(io+1)>>7)&0x01); |
| if(i<24) { |
| outb(0x01,io+1); |
| tunestat&=inb(io+1); |
| outb(0x00,io+1); |
| } |
| } |
| |
| /* |
| * Restore volume/mute setting |
| */ |
| outb(curvol,io+1); |
| spin_unlock(&cadet_io_lock); |
| |
| return fifo; |
| } |
| |
| static unsigned cadet_getfreq(void) |
| { |
| int i; |
| unsigned freq=0,test,fifo=0; |
| |
| /* |
| * Read current tuning |
| */ |
| fifo=cadet_gettune(); |
| |
| /* |
| * Convert to actual frequency |
| */ |
| if(curtuner==0) { /* FM */ |
| test=12500; |
| for(i=0;i<14;i++) { |
| if((fifo&0x01)!=0) { |
| freq+=test; |
| } |
| test=test<<1; |
| fifo=fifo>>1; |
| } |
| freq-=10700000; /* IF frequency is 10.7 MHz */ |
| freq=(freq*16)/1000000; /* Make it 1/16 MHz */ |
| } |
| if(curtuner==1) { /* AM */ |
| freq=((fifo&0x7fff)-2010)*16; |
| } |
| |
| return freq; |
| } |
| |
| static void cadet_settune(unsigned fifo) |
| { |
| int i; |
| unsigned test; |
| |
| spin_lock(&cadet_io_lock); |
| |
| outb(7,io); /* Select tuner control */ |
| /* |
| * Write the shift register |
| */ |
| test=0; |
| test=(fifo>>23)&0x02; /* Align data for SDO */ |
| test|=0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */ |
| outb(7,io); /* Select tuner control */ |
| outb(test,io+1); /* Initialize for write */ |
| for(i=0;i<25;i++) { |
| test|=0x01; /* Toggle SCK High */ |
| outb(test,io+1); |
| test&=0xfe; /* Toggle SCK Low */ |
| outb(test,io+1); |
| fifo=fifo<<1; /* Prepare the next bit */ |
| test=0x1c|((fifo>>23)&0x02); |
| outb(test,io+1); |
| } |
| spin_unlock(&cadet_io_lock); |
| } |
| |
| static void cadet_setfreq(unsigned freq) |
| { |
| unsigned fifo; |
| int i,j,test; |
| int curvol; |
| |
| /* |
| * Formulate a fifo command |
| */ |
| fifo=0; |
| if(curtuner==0) { /* FM */ |
| test=102400; |
| freq=(freq*1000)/16; /* Make it kHz */ |
| freq+=10700; /* IF is 10700 kHz */ |
| for(i=0;i<14;i++) { |
| fifo=fifo<<1; |
| if(freq>=test) { |
| fifo|=0x01; |
| freq-=test; |
| } |
| test=test>>1; |
| } |
| } |
| if(curtuner==1) { /* AM */ |
| fifo=(freq/16)+2010; /* Make it kHz */ |
| fifo|=0x100000; /* Select AM Band */ |
| } |
| |
| /* |
| * Save current volume/mute setting |
| */ |
| |
| spin_lock(&cadet_io_lock); |
| outb(7,io); /* Select tuner control */ |
| curvol=inb(io+1); |
| spin_unlock(&cadet_io_lock); |
| |
| /* |
| * Tune the card |
| */ |
| for(j=3;j>-1;j--) { |
| cadet_settune(fifo|(j<<16)); |
| |
| spin_lock(&cadet_io_lock); |
| outb(7,io); /* Select tuner control */ |
| outb(curvol,io+1); |
| spin_unlock(&cadet_io_lock); |
| |
| msleep(100); |
| |
| cadet_gettune(); |
| if((tunestat & 0x40) == 0) { /* Tuned */ |
| sigstrength=sigtable[curtuner][j]; |
| return; |
| } |
| } |
| sigstrength=0; |
| } |
| |
| |
| static int cadet_getvol(void) |
| { |
| int ret = 0; |
| |
| spin_lock(&cadet_io_lock); |
| |
| outb(7,io); /* Select tuner control */ |
| if((inb(io + 1) & 0x20) != 0) |
| ret = 0xffff; |
| |
| spin_unlock(&cadet_io_lock); |
| return ret; |
| } |
| |
| |
| static void cadet_setvol(int vol) |
| { |
| spin_lock(&cadet_io_lock); |
| outb(7,io); /* Select tuner control */ |
| if(vol>0) |
| outb(0x20,io+1); |
| else |
| outb(0x00,io+1); |
| spin_unlock(&cadet_io_lock); |
| } |
| |
| static void cadet_handler(unsigned long data) |
| { |
| /* |
| * Service the RDS fifo |
| */ |
| |
| if(spin_trylock(&cadet_io_lock)) |
| { |
| outb(0x3,io); /* Select RDS Decoder Control */ |
| if((inb(io+1)&0x20)!=0) { |
| printk(KERN_CRIT "cadet: RDS fifo overflow\n"); |
| } |
| outb(0x80,io); /* Select RDS fifo */ |
| while((inb(io)&0x80)!=0) { |
| rdsbuf[rdsin]=inb(io+1); |
| if(rdsin==rdsout) |
| printk(KERN_WARNING "cadet: RDS buffer overflow\n"); |
| else |
| rdsin++; |
| } |
| spin_unlock(&cadet_io_lock); |
| } |
| |
| /* |
| * Service pending read |
| */ |
| if( rdsin!=rdsout) |
| wake_up_interruptible(&read_queue); |
| |
| /* |
| * Clean up and exit |
| */ |
| init_timer(&readtimer); |
| readtimer.function=cadet_handler; |
| readtimer.data=(unsigned long)0; |
| readtimer.expires=jiffies+(HZ/20); |
| add_timer(&readtimer); |
| } |
| |
| |
| |
| static ssize_t cadet_read(struct file *file, char __user *data, |
| size_t count, loff_t *ppos) |
| { |
| int i=0; |
| unsigned char readbuf[RDS_BUFFER]; |
| |
| if(rdsstat==0) { |
| spin_lock(&cadet_io_lock); |
| rdsstat=1; |
| outb(0x80,io); /* Select RDS fifo */ |
| spin_unlock(&cadet_io_lock); |
| init_timer(&readtimer); |
| readtimer.function=cadet_handler; |
| readtimer.data=(unsigned long)0; |
| readtimer.expires=jiffies+(HZ/20); |
| add_timer(&readtimer); |
| } |
| if(rdsin==rdsout) { |
| if (file->f_flags & O_NONBLOCK) |
| return -EWOULDBLOCK; |
| interruptible_sleep_on(&read_queue); |
| } |
| while( i<count && rdsin!=rdsout) |
| readbuf[i++]=rdsbuf[rdsout++]; |
| |
| if (copy_to_user(data,readbuf,i)) |
| return -EFAULT; |
| return i; |
| } |
| |
| |
| |
| static int cadet_do_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, void *arg) |
| { |
| switch(cmd) |
| { |
| case VIDIOCGCAP: |
| { |
| struct video_capability *v = arg; |
| memset(v,0,sizeof(*v)); |
| v->type=VID_TYPE_TUNER; |
| v->channels=2; |
| v->audios=1; |
| strcpy(v->name, "ADS Cadet"); |
| return 0; |
| } |
| case VIDIOCGTUNER: |
| { |
| struct video_tuner *v = arg; |
| if((v->tuner<0)||(v->tuner>1)) { |
| return -EINVAL; |
| } |
| switch(v->tuner) { |
| case 0: |
| strcpy(v->name,"FM"); |
| v->rangelow=1400; /* 87.5 MHz */ |
| v->rangehigh=1728; /* 108.0 MHz */ |
| v->flags=0; |
| v->mode=0; |
| v->mode|=VIDEO_MODE_AUTO; |
| v->signal=sigstrength; |
| if(cadet_getstereo()==1) { |
| v->flags|=VIDEO_TUNER_STEREO_ON; |
| } |
| v->flags|=cadet_getrds(); |
| break; |
| case 1: |
| strcpy(v->name,"AM"); |
| v->rangelow=8320; /* 520 kHz */ |
| v->rangehigh=26400; /* 1650 kHz */ |
| v->flags=0; |
| v->flags|=VIDEO_TUNER_LOW; |
| v->mode=0; |
| v->mode|=VIDEO_MODE_AUTO; |
| v->signal=sigstrength; |
| break; |
| } |
| return 0; |
| } |
| case VIDIOCSTUNER: |
| { |
| struct video_tuner *v = arg; |
| if((v->tuner<0)||(v->tuner>1)) { |
| return -EINVAL; |
| } |
| curtuner=v->tuner; |
| return 0; |
| } |
| case VIDIOCGFREQ: |
| { |
| unsigned long *freq = arg; |
| *freq = cadet_getfreq(); |
| return 0; |
| } |
| case VIDIOCSFREQ: |
| { |
| unsigned long *freq = arg; |
| if((curtuner==0)&&((*freq<1400)||(*freq>1728))) { |
| return -EINVAL; |
| } |
| if((curtuner==1)&&((*freq<8320)||(*freq>26400))) { |
| return -EINVAL; |
| } |
| cadet_setfreq(*freq); |
| return 0; |
| } |
| case VIDIOCGAUDIO: |
| { |
| struct video_audio *v = arg; |
| memset(v,0, sizeof(*v)); |
| v->flags=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; |
| if(cadet_getstereo()==0) { |
| v->mode=VIDEO_SOUND_MONO; |
| } else { |
| v->mode=VIDEO_SOUND_STEREO; |
| } |
| v->volume=cadet_getvol(); |
| v->step=0xffff; |
| strcpy(v->name, "Radio"); |
| return 0; |
| } |
| case VIDIOCSAUDIO: |
| { |
| struct video_audio *v = arg; |
| if(v->audio) |
| return -EINVAL; |
| cadet_setvol(v->volume); |
| if(v->flags&VIDEO_AUDIO_MUTE) |
| cadet_setvol(0); |
| else |
| cadet_setvol(0xffff); |
| return 0; |
| } |
| default: |
| return -ENOIOCTLCMD; |
| } |
| } |
| |
| static int cadet_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| return video_usercopy(inode, file, cmd, arg, cadet_do_ioctl); |
| } |
| |
| static int cadet_open(struct inode *inode, struct file *file) |
| { |
| if(users) |
| return -EBUSY; |
| users++; |
| init_waitqueue_head(&read_queue); |
| return 0; |
| } |
| |
| static int cadet_release(struct inode *inode, struct file *file) |
| { |
| del_timer_sync(&readtimer); |
| rdsstat=0; |
| users--; |
| return 0; |
| } |
| |
| |
| static struct file_operations cadet_fops = { |
| .owner = THIS_MODULE, |
| .open = cadet_open, |
| .release = cadet_release, |
| .read = cadet_read, |
| .ioctl = cadet_ioctl, |
| .llseek = no_llseek, |
| }; |
| |
| static struct video_device cadet_radio= |
| { |
| .owner = THIS_MODULE, |
| .name = "Cadet radio", |
| .type = VID_TYPE_TUNER, |
| .hardware = VID_HARDWARE_CADET, |
| .fops = &cadet_fops, |
| }; |
| |
| static struct pnp_device_id cadet_pnp_devices[] = { |
| /* ADS Cadet AM/FM Radio Card */ |
| {.id = "MSM0c24", .driver_data = 0}, |
| {.id = ""} |
| }; |
| |
| MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices); |
| |
| static int cadet_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id) |
| { |
| if (!dev) |
| return -ENODEV; |
| /* only support one device */ |
| if (io > 0) |
| return -EBUSY; |
| |
| if (!pnp_port_valid(dev, 0)) { |
| return -ENODEV; |
| } |
| |
| io = pnp_port_start(dev, 0); |
| |
| printk ("radio-cadet: PnP reports device at %#x\n", io); |
| |
| return io; |
| } |
| |
| static struct pnp_driver cadet_pnp_driver = { |
| .name = "radio-cadet", |
| .id_table = cadet_pnp_devices, |
| .probe = cadet_pnp_probe, |
| .remove = NULL, |
| }; |
| |
| static int cadet_probe(void) |
| { |
| static int iovals[8]={0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e}; |
| int i; |
| |
| for(i=0;i<8;i++) { |
| io=iovals[i]; |
| if(request_region(io,2, "cadet-probe")>=0) { |
| cadet_setfreq(1410); |
| if(cadet_getfreq()==1410) { |
| release_region(io, 2); |
| return io; |
| } |
| release_region(io, 2); |
| } |
| } |
| return -1; |
| } |
| |
| /* |
| * io should only be set if the user has used something like |
| * isapnp (the userspace program) to initialize this card for us |
| */ |
| |
| static int __init cadet_init(void) |
| { |
| spin_lock_init(&cadet_io_lock); |
| |
| /* |
| * If a probe was requested then probe ISAPnP first (safest) |
| */ |
| if (io < 0) |
| pnp_register_driver(&cadet_pnp_driver); |
| /* |
| * If that fails then probe unsafely if probe is requested |
| */ |
| if(io < 0) |
| io = cadet_probe (); |
| |
| /* |
| * Else we bail out |
| */ |
| |
| if(io < 0) { |
| #ifdef MODULE |
| printk(KERN_ERR "You must set an I/O address with io=0x???\n"); |
| #endif |
| goto fail; |
| } |
| if (!request_region(io,2,"cadet")) |
| goto fail; |
| if(video_register_device(&cadet_radio,VFL_TYPE_RADIO,radio_nr)==-1) { |
| release_region(io,2); |
| goto fail; |
| } |
| printk(KERN_INFO "ADS Cadet Radio Card at 0x%x\n",io); |
| return 0; |
| fail: |
| pnp_unregister_driver(&cadet_pnp_driver); |
| return -1; |
| } |
| |
| |
| |
| MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath"); |
| MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card."); |
| MODULE_LICENSE("GPL"); |
| |
| module_param(io, int, 0); |
| MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)"); |
| module_param(radio_nr, int, 0); |
| |
| static void __exit cadet_cleanup_module(void) |
| { |
| video_unregister_device(&cadet_radio); |
| release_region(io,2); |
| pnp_unregister_driver(&cadet_pnp_driver); |
| } |
| |
| module_init(cadet_init); |
| module_exit(cadet_cleanup_module); |
| |