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acrn-kernel/drivers/media/radio/radio-gemtek.c

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/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
*
* 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 <Alan.Cox@linux.org>
* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
*
* TODO: Allow for more than one of these foolish entities :-)
*
* 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/spinlock.h>
#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 = 65535,
.default_value = 0xff,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
#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 VIDIOC_QUERYCAP:
{
struct v4l2_capability *v = arg;
memset(v,0,sizeof(*v));
strlcpy(v->driver, "radio-gemtek", sizeof (v->driver));
strlcpy(v->card, "GemTek", 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;
if (v->index > 0)
return -EINVAL;
memset(v,0,sizeof(*v));
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow=(87*16000);
v->rangehigh=(108*16000);
v->rxsubchans =V4L2_TUNER_SUB_MONO;
v->capability=V4L2_TUNER_CAP_LOW;
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal=0xFFFF*gemtek_getsigstr(rt);
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;
rt->curfreq = f->frequency;
/* needs to be called twice in order for getsigstr to work */
gemtek_setfreq(rt, rt->curfreq);
gemtek_setfreq(rt, rt->curfreq);
return 0;
}
case VIDIOC_G_FREQUENCY:
{
struct v4l2_frequency *f = arg;
f->type = V4L2_TUNER_RADIO;
f->frequency = rt->curfreq;
return 0;
}
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *qc = arg;
int i;
for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
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=rt->muted;
return (0);
case V4L2_CID_AUDIO_VOLUME:
if (rt->muted)
ctrl->value=0;
else
ctrl->value=65535;
return (0);
}
return -EINVAL;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl= arg;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value) {
gemtek_mute(rt);
} else {
gemtek_unmute(rt);
}
return (0);
case V4L2_CID_AUDIO_VOLUME:
if (ctrl->value) {
gemtek_unmute(rt);
} else {
gemtek_mute(rt);
}
return (0);
}
return -EINVAL;
}
default:
return v4l_compat_translate_ioctl(inode,file,cmd,arg,
gemtek_do_ioctl);
}
}
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 const 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 = 0,
.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:
*/
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