kevin/linux
1
Fork 0
Code
8ce47dad8e
linux/drivers/media/radio/radio-sf16fmr2.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

494 lines
11 KiB
C
Raw Blame History

/* SF16FMR2 radio driver for Linux radio support
* heavily based on fmi driver...
* (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
*
* Notes on the hardware
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
* No volume control - only mute/unmute - you have to use line volume
*
* For read stereo/mono you must wait 0.1 sec after set frequency and
* card unmuted so I set frequency on unmute
* Signal handling seem to work only on autoscanning (not implemented)
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
*/
#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> /* kernel radio structs */
#include <media/v4l2-common.h>
#include <linux/mutex.h>
static struct mutex lock;
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#define RADIO_VERSION KERNEL_VERSION(0,0,2)
static struct v4l2_queryctrl radio_qctrl[] = {
{
.id = V4L2_CID_AUDIO_MUTE,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.default_value = 1,
.type = V4L2_CTRL_TYPE_BOOLEAN,
},{
.id = V4L2_CID_AUDIO_VOLUME,
.name = "Volume",
.minimum = 0,
.maximum = 65535,
.step = 1<<12,
.default_value = 0xff,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
#undef DEBUG
//#define DEBUG 1
#ifdef DEBUG
# define debug_print(s) printk s
#else
# define debug_print(s)
#endif
/* this should be static vars for module size */
struct fmr2_device
{
int port;
int curvol; /* 0-65535, if not volume 0 or 65535 */
int mute;
int stereo; /* card is producing stereo audio */
unsigned long curfreq; /* freq in kHz */
int card_type;
__u32 flags;
};
static int io = 0x384;
static int radio_nr = -1;
/* hw precision is 12.5 kHz
* It is only useful to give freq in intervall of 200 (=0.0125Mhz),
* other bits will be truncated
*/
#define RSF16_ENCODE(x) ((x)/200+856)
#define RSF16_MINFREQ 87*16000
#define RSF16_MAXFREQ 108*16000
static inline void wait(int n,int port)
{
for (;n;--n) inb(port);
}
static void outbits(int bits, unsigned int data, int nWait, int port)
{
int bit;
for(;--bits>=0;) {
bit = (data>>bits) & 1;
outb(bit,port);
wait(nWait,port);
outb(bit|2,port);
wait(nWait,port);
outb(bit,port);
wait(nWait,port);
}
}
static inline void fmr2_mute(int port)
{
outb(0x00, port);
wait(4,port);
}
static inline void fmr2_unmute(int port)
{
outb(0x04, port);
wait(4,port);
}
static inline int fmr2_stereo_mode(int port)
{
int n = inb(port);
outb(6,port);
inb(port);
n = ((n>>3)&1)^1;
debug_print((KERN_DEBUG "stereo: %d\n", n));
return n;
}
static int fmr2_product_info(struct fmr2_device *dev)
{
int n = inb(dev->port);
n &= 0xC1;
if (n == 0)
{
/* this should support volume set */
dev->card_type = 12;
return 0;
}
/* not volume (mine is 11) */
dev->card_type = (n==128)?11:0;
return n;
}
static inline int fmr2_getsigstr(struct fmr2_device *dev)
{
/* !!! work only if scanning freq */
int port = dev->port, res = 0xffff;
outb(5,port);
wait(4,port);
if (!(inb(port)&1)) res = 0;
debug_print((KERN_DEBUG "signal: %d\n", res));
return res;
}
/* set frequency and unmute card */
static int fmr2_setfreq(struct fmr2_device *dev)
{
int port = dev->port;
unsigned long freq = dev->curfreq;
fmr2_mute(port);
/* 0x42 for mono output
* 0x102 forward scanning
* 0x182 scansione avanti
*/
outbits(9,0x2,3,port);
outbits(16,RSF16_ENCODE(freq),2,port);
fmr2_unmute(port);
/* wait 0.11 sec */
msleep(110);
/* NOTE if mute this stop radio
you must set freq on unmute */
dev->stereo = fmr2_stereo_mode(port);
return 0;
}
/* !!! not tested, in my card this does't work !!! */
static int fmr2_setvolume(struct fmr2_device *dev)
{
int i,a,n, port = dev->port;
if (dev->card_type != 11) return 1;
switch( (dev->curvol+(1<<11)) >> 12 )
{
case 0: case 1: n = 0x21; break;
case 2: n = 0x84; break;
case 3: n = 0x90; break;
case 4: n = 0x104; break;
case 5: n = 0x110; break;
case 6: n = 0x204; break;
case 7: n = 0x210; break;
case 8: n = 0x402; break;
case 9: n = 0x404; break;
default:
case 10: n = 0x408; break;
case 11: n = 0x410; break;
case 12: n = 0x801; break;
case 13: n = 0x802; break;
case 14: n = 0x804; break;
case 15: n = 0x808; break;
case 16: n = 0x810; break;
}
for(i=12;--i>=0;)
{
a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
outb(a|4, port);
wait(4,port);
outb(a|0x24, port);
wait(4,port);
outb(a|4, port);
wait(4,port);
}
for(i=6;--i>=0;)
{
a = ((0x18 >> i) & 1) << 6;
outb(a|4, port);
wait(4,port);
outb(a|0x24, port);
wait(4,port);
outb(a|4, port);
wait(4,port);
}
wait(4,port);
outb(0x14, port);
return 0;
}
static int fmr2_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct fmr2_device *fmr2 = dev->priv;
debug_print((KERN_DEBUG "freq %ld flags %d vol %d mute %d "
"stereo %d type %d\n",
fmr2->curfreq, fmr2->flags, fmr2->curvol, fmr2->mute,
fmr2->stereo, fmr2->card_type));
switch(cmd)
{
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *v = arg;
memset(v,0,sizeof(*v));
strlcpy(v->driver, "radio-sf16fmr2", sizeof (v->driver));
strlcpy(v->card, "SF16-FMR2 radio", sizeof (v->card));
sprintf(v->bus_info,"ISA");
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER;
return 0;
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *v = arg;
int mult;
if (v->index > 0)
return -EINVAL;
memset(v,0,sizeof(*v));
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
v->rangelow = RSF16_MINFREQ/mult;
v->rangehigh = RSF16_MAXFREQ/mult;
v->rxsubchans =V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
v->capability=fmr2->flags&V4L2_TUNER_CAP_LOW;
v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
V4L2_TUNER_MODE_MONO;
mutex_lock(&lock);
v->signal = fmr2_getsigstr(fmr2);
mutex_unlock(&lock);
return 0;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *v = arg;
if (v->index > 0)
return -EINVAL;
return 0;
}
case VIDIOC_S_FREQUENCY:
{
struct v4l2_frequency *f = arg;
if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
f->frequency *= 1000;
if (f->frequency < RSF16_MINFREQ ||
f->frequency > RSF16_MAXFREQ )
return -EINVAL;
/*rounding in steps of 200 to match th freq
that will be used */
fmr2->curfreq = (f->frequency/200)*200;
/* set card freq (if not muted) */
if (fmr2->curvol && !fmr2->mute)
{
mutex_lock(&lock);
fmr2_setfreq(fmr2);
mutex_unlock(&lock);
}
return 0;
}
case VIDIOC_G_FREQUENCY:
{
struct v4l2_frequency *f = arg;
f->type = V4L2_TUNER_RADIO;
f->frequency = fmr2->curfreq;
if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
f->frequency /= 1000;
return 0;
}
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *qc = arg;
int i;
for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
if ((fmr2->card_type != 11)
&& V4L2_CID_AUDIO_VOLUME)
radio_qctrl[i].step=65535;
if (qc->id && qc->id == radio_qctrl[i].id) {
memcpy(qc, &(radio_qctrl[i]),
sizeof(*qc));
return (0);
}
}
return -EINVAL;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *ctrl= arg;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value=fmr2->mute;
return (0);
case V4L2_CID_AUDIO_VOLUME:
ctrl->value=fmr2->curvol;
return (0);
}
return -EINVAL;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl= arg;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
fmr2->mute=ctrl->value;
if (fmr2->card_type != 11) {
if (!fmr2->mute) {
fmr2->curvol = 65535;
} else {
fmr2->curvol = 0;
}
}
break;
case V4L2_CID_AUDIO_VOLUME:
fmr2->curvol = ctrl->value;
if (fmr2->card_type != 11) {
if (fmr2->curvol) {
fmr2->curvol = 65535;
fmr2->mute = 0;
} else {
fmr2->curvol = 0;
fmr2->mute = 1;
}
}
break;
default:
return -EINVAL;
}
#ifdef DEBUG
if (fmr2->curvol && !fmr2->mute)
printk(KERN_DEBUG "unmute\n");
else
printk(KERN_DEBUG "mute\n");
#endif
mutex_lock(&lock);
if (fmr2->curvol && !fmr2->mute) {
fmr2_setvolume(fmr2);
fmr2_setfreq(fmr2);
} else
fmr2_mute(fmr2->port);
mutex_unlock(&lock);
return (0);
}
default:
return v4l_compat_translate_ioctl(inode,file,cmd,arg,
fmr2_do_ioctl);
}
}
static int fmr2_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, fmr2_do_ioctl);
}
static struct fmr2_device fmr2_unit;
static const struct file_operations fmr2_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = fmr2_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device fmr2_radio=
{
.owner = THIS_MODULE,
.name = "SF16FMR2 radio",
. type = VID_TYPE_TUNER,
.hardware = 0,
.fops = &fmr2_fops,
};
static int __init fmr2_init(void)
{
fmr2_unit.port = io;
fmr2_unit.curvol = 0;
fmr2_unit.mute = 0;
fmr2_unit.curfreq = 0;
fmr2_unit.stereo = 1;
fmr2_unit.flags = V4L2_TUNER_CAP_LOW;
fmr2_unit.card_type = 0;
fmr2_radio.priv = &fmr2_unit;
mutex_init(&lock);
if (request_region(io, 2, "sf16fmr2"))
{
printk(KERN_ERR "fmr2: port 0x%x already in use\n", io);
return -EBUSY;
}
if(video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 2);
return -EINVAL;
}
printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
/* mute card - prevents noisy bootups */
mutex_lock(&lock);
fmr2_mute(io);
fmr2_product_info(&fmr2_unit);
mutex_unlock(&lock);
debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
return 0;
}
MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
module_param(radio_nr, int, 0);
static void __exit fmr2_cleanup_module(void)
{
video_unregister_device(&fmr2_radio);
release_region(io,2);
}
module_init(fmr2_init);
module_exit(fmr2_cleanup_module);
#ifndef MODULE
static int __init fmr2_setup_io(char *str)
{
get_option(&str, &io);
return 1;
}
__setup("sf16fmr2=", fmr2_setup_io);
#endif
View Git Blame Copy Permalink