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alistair23-linux/drivers/media/radio/radio-cadet.c
Arjan van de Ven fa027c2a0a [PATCH] mark struct file_operations const 4 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

[akpm@sdl.org: dvb fix]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

645 lines
13 KiB
C
Raw Blame History

/* 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
*
* 2006-07-30 Hans J. Koch <koch@hjk-az.de>
* Changed API to V4L2
*/
#include <linux/version.h>
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <asm/io.h> /* outb, outb_p */
#include <asm/uaccess.h> /* copy to/from user */
#include <linux/videodev2.h> /* V4L2 API defs */
#include <media/v4l2-common.h>
#include <linux/param.h>
#include <linux/pnp.h>
#define RDS_BUFFER 256
#define RDS_RX_FLAG 1
#define MBS_RX_FLAG 2
#define CADET_VERSION KERNEL_VERSION(0,3,3)
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_getstereo(void)
{
int ret = V4L2_TUNER_SUB_MONO;
if(curtuner != 0) /* Only FM has stereo capability! */
return V4L2_TUNER_SUB_MONO;
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
if( (inb(io+1) & 0x40) == 0)
ret = V4L2_TUNER_SUB_STEREO;
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 VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = arg;
memset(cap,0,sizeof(*cap));
cap->capabilities =
V4L2_CAP_TUNER |
V4L2_CAP_READWRITE;
cap->version = CADET_VERSION;
strcpy(cap->driver, "ADS Cadet");
strcpy(cap->card, "ADS Cadet");
return 0;
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *t = arg;
memset(t,0,sizeof(*t));
t->type = V4L2_TUNER_RADIO;
switch (t->index)
{
case 0: strcpy(t->name, "FM");
t->capability = V4L2_TUNER_CAP_STEREO;
t->rangelow = 1400; /* 87.5 MHz */
t->rangehigh = 1728; /* 108.0 MHz */
t->rxsubchans=cadet_getstereo();
switch (t->rxsubchans){
case V4L2_TUNER_SUB_MONO:
t->audmode = V4L2_TUNER_MODE_MONO;
break;
case V4L2_TUNER_SUB_STEREO:
t->audmode = V4L2_TUNER_MODE_STEREO;
break;
default: ;
}
break;
case 1: strcpy(t->name, "AM");
t->capability = V4L2_TUNER_CAP_LOW;
t->rangelow = 8320; /* 520 kHz */
t->rangehigh = 26400; /* 1650 kHz */
t->rxsubchans = V4L2_TUNER_SUB_MONO;
t->audmode = V4L2_TUNER_MODE_MONO;
break;
default:
return -EINVAL;
}
t->signal = sigstrength; /* We might need to modify scaling of this */
return 0;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *t = arg;
if((t->index != 0)&&(t->index != 1))
return -EINVAL;
curtuner = t->index;
return 0;
}
case VIDIOC_G_FREQUENCY:
{
struct v4l2_frequency *f = arg;
memset(f,0,sizeof(*f));
f->tuner = curtuner;
f->type = V4L2_TUNER_RADIO;
f->frequency = cadet_getfreq();
return 0;
}
case VIDIOC_S_FREQUENCY:
{
struct v4l2_frequency *f = arg;
if (f->type != V4L2_TUNER_RADIO){
return -EINVAL;
}
if((curtuner==0)&&((f->frequency<1400)||(f->frequency>1728))) {
return -EINVAL;
}
if((curtuner==1)&&((f->frequency<8320)||(f->frequency>26400))) {
return -EINVAL;
}
cadet_setfreq(f->frequency);
return 0;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *c = arg;
switch (c->id){
case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
c->value = (cadet_getvol() == 0);
break;
case V4L2_CID_AUDIO_VOLUME:
c->value = cadet_getvol();
break;
default:
return -EINVAL;
}
return 0;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *c = arg;
switch (c->id){
case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
if (c->value) cadet_setvol(0);
else cadet_setvol(0xffff);
break;
case V4L2_CID_AUDIO_VOLUME:
cadet_setvol(c->value);
break;
default:
return -EINVAL;
}
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)
{
users++;
if (1 == users) init_waitqueue_head(&read_queue);
return 0;
}
static int
cadet_release(struct inode *inode, struct file *file)
{
users--;
if (0 == users){
del_timer_sync(&readtimer);
rdsstat=0;
}
return 0;
}
static unsigned int
cadet_poll(struct file *file, struct poll_table_struct *wait)
{
poll_wait(file,&read_queue,wait);
if(rdsin != rdsout)
return POLLIN | POLLRDNORM;
return 0;
}
static const struct file_operations cadet_fops = {
.owner = THIS_MODULE,
.open = cadet_open,
.release = cadet_release,
.read = cadet_read,
.ioctl = cadet_ioctl,
.poll = cadet_poll,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device cadet_radio=
{
.owner = THIS_MODULE,
.name = "Cadet radio",
.type = VID_TYPE_TUNER,
.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")) {
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);
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