- 根目录:
- drivers
- media
- radio
- radio-aimslab.c
/* radiotrack (radioreveal) driver for Linux radio support
* (c) 1997 M. Kirkwood
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
* Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
*
* History:
* 1999-02-24 Russell Kroll <rkroll@exploits.org>
* Fine tuning/VIDEO_TUNER_LOW
* Frequency range expanded to start at 87 MHz
*
* TODO: Allow for more than one of these foolish entities :-)
*
* Notes on the hardware (reverse engineered from other peoples'
* reverse engineering of AIMS' code :-)
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
*
* The signal strength query is unsurprisingly inaccurate. And it seems
* to indicate that (on my card, at least) the frequency setting isn't
* too great. (I have to tune up .025MHz from what the freq should be
* to get a report that the thing is tuned.)
*
* Volume control is (ugh) analogue:
* out(port, start_increasing_volume);
* wait(a_wee_while);
* out(port, stop_changing_the_volume);
*
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* msleep */
#include <linux/videodev2.h> /* kernel radio structs */
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#include <linux/io.h> /* outb, outb_p */
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
MODULE_AUTHOR("M.Kirkwood");
MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
MODULE_LICENSE("GPL");
#ifndef CONFIG_RADIO_RTRACK_PORT
#define CONFIG_RADIO_RTRACK_PORT -1
#endif
static int io = CONFIG_RADIO_RTRACK_PORT;
static int radio_nr = -1;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
module_param(radio_nr, int, 0);
#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
struct rtrack
{
struct v4l2_device v4l2_dev;
struct video_device vdev;
int port;
int curvol;
unsigned long curfreq;
int muted;
int io;
struct mutex lock;
};
static struct rtrack rtrack_card;
/* local things */
static void rt_decvol(struct rtrack *rt)
{
outb(0x58, rt->io); /* volume down + sigstr + on */
msleep(100);
outb(0xd8, rt->io); /* volume steady + sigstr + on */
}
static void rt_incvol(struct rtrack *rt)
{
outb(0x98, rt->io); /* volume up + sigstr + on */
msleep(100);
outb(0xd8, rt->io); /* volume steady + sigstr + on */
}
static void rt_mute(struct rtrack *rt)
{
rt->muted = 1;
mutex_lock(&rt->lock);
outb(0xd0, rt->io); /* volume steady, off */
mutex_unlock(&rt->lock);
}
static int rt_setvol(struct rtrack *rt, int vol)
{
int i;
mutex_lock(&rt->lock);
if (vol == rt->curvol) { /* requested volume = current */
if (rt->muted) { /* user is unmuting the card */
rt->muted = 0;
outb(0xd8, rt->io); /* enable card */
}
mutex_unlock(&rt->lock);
return 0;
}
if (vol == 0) { /* volume = 0 means mute the card */
outb(0x48, rt->io); /* volume down but still "on" */
msleep(2000); /* make sure it's totally down */
outb(0xd0, rt->io); /* volume steady, off */
rt->curvol = 0; /* track the volume state! */
mutex_unlock(&rt->lock);
return 0;
}
rt->muted = 0;
if (vol > rt->curvol)
for (i = rt->curvol; i < vol; i++)
rt_incvol(rt);
else
for (i = rt->curvol; i > vol; i--)
rt_decvol(rt);
rt->curvol = vol;
mutex_unlock(&rt->lock);
return 0;
}
/* the 128+64 on these outb's is to keep the volume stable while tuning
* without them, the volume _will_ creep up with each frequency change
* and bit 4 (+16) is to keep the signal strength meter enabled
*/
static void send_0_byte(struct rtrack *rt)
{
if (rt->curvol == 0 || rt->muted) {
outb_p(128+64+16+ 1, rt->io); /* wr-enable + data low */
outb_p(128+64+16+2+1, rt->io); /* clock */
}
else {
outb_p(128+64+16+8+ 1, rt->io); /* on + wr-enable + data low */
outb_p(128+64+16+8+2+1, rt->io); /* clock */
}
msleep(1);
}
static void send_1_byte(struct rtrack *rt)
{
if (rt->curvol == 0 || rt->muted) {
outb_p(128+64+16+4 +1, rt->io); /* wr-enable+data high */
outb_p(128+64+16+4+2+1, rt->io); /* clock */
}
else {
outb_p(128+64+16+8+4 +1, rt->io); /* on+wr-enable+data high */
outb_p(128+64+16+8+4+2+1, rt->io); /* clock */
}
msleep(1);
}
static int rt_setfreq(struct rtrack *rt, unsigned long freq)
{
int i;
mutex_lock(&rt->lock); /* Stop other ops interfering */
rt->curfreq = freq;
/* now uses VIDEO_TUNER_LOW for fine tuning */
freq += 171200; /* Add 10.7 MHz IF */
freq /= 800; /* Convert to 50 kHz units */
send_0_byte(rt); /* 0: LSB of frequency */
for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
if (freq & (1 << i))
send_1_byte(rt);
else
send_0_byte(rt);
send_0_byte(rt); /* 14: test bit - always 0 */
send_0_byte(rt); /* 15: test bit - always 0 */
send_0_byte(rt); /* 16: band data 0 - always 0 */
send_0_byte(rt); /* 17: band data 1 - always 0 */
send_0_byte(rt); /* 18: band data 2 - always 0 */
send_0_byte(rt); /* 19: time base - always 0 */
send_0_byte(rt); /* 20: spacing (0 = 25 kHz) */
send_1_byte(rt); /* 21: spacing (1 = 25 kHz) */
send_0_byte(rt); /* 22: spacing (0 = 25 kHz) */
send_1_byte(rt); /* 23: AM/FM (FM = 1, always) */
if (rt->curvol == 0 || rt->muted)
outb(0xd0, rt->io); /* volume steady + sigstr */
else
outb(0xd8, rt->io); /* volume steady + sigstr + on */
mutex_unlock(&rt->lock);
return 0;
}
static int rt_getsigstr(struct rtrack *rt)
{
int sig = 1;
mutex_lock(&rt->lock);
if (inb(rt->io) & 2) /* bit set = no signal present */
sig = 0;
mutex_unlock(&rt->lock);
return sig;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
strlcpy(v->card, "RadioTrack", sizeof(v->card));
strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct rtrack *rt = video_drvdata(file);
if (v->index > 0)
return -EINVAL;
strlcpy(v->name, "FM", sizeof(v->name));
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 * rt_getsigstr(rt);
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
return v->index ? -EINVAL : 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct rtrack *rt = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
rt_setfreq(rt, f->frequency);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct rtrack *rt = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = rt->curfreq;
return 0;
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
switch (qc->id) {
case V4L2_CID_AUDIO_MUTE:
return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
case V4L2_CID_AUDIO_VOLUME:
return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
}
return -EINVAL;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct rtrack *rt = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = rt->muted;
return 0;
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = rt->curvol;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct rtrack *rt = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value)
rt_mute(rt);
else
rt_setvol(rt, rt->curvol);
return 0;
case V4L2_CID_AUDIO_VOLUME:
rt_setvol(rt, ctrl->value);
return 0;
}
return -EINVAL;
}
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
return i ? -EINVAL : 0;
}
static int vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
a->index = 0;
strlcpy(a->name, "Radio", sizeof(a->name));
a->capability = V4L2_AUDCAP_STEREO;
return 0;
}
static int vidioc_s_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
return a->index ? -EINVAL : 0;
}
static const struct v4l2_file_operations rtrack_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops rtrack_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_g_tuner = vidioc_g_tuner,
.vidioc_s_tuner = vidioc_s_tuner,
.vidioc_g_audio = vidioc_g_audio,
.vidioc_s_audio = vidioc_s_audio,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
};
static int __init rtrack_init(void)
{
struct rtrack *rt = &rtrack_card;
struct v4l2_device *v4l2_dev = &rt->v4l2_dev;
int res;
strlcpy(v4l2_dev->name, "rtrack", sizeof(v4l2_dev->name));
rt->io = io;
if (rt->io == -1) {
v4l2_err(v4l2_dev, "you must set an I/O address with io=0x20f or 0x30f\n");
return -EINVAL;
}
if (!request_region(rt->io, 2, "rtrack")) {
v4l2_err(v4l2_dev, "port 0x%x already in use\n", rt->io);
return -EBUSY;
}
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
release_region(rt->io, 2);
v4l2_err(v4l2_dev, "could not register v4l2_device\n");
return res;
}
strlcpy(rt->vdev.name, v4l2_dev->name, sizeof(rt->vdev.name));
rt->vdev.v4l2_dev = v4l2_dev;
rt->vdev.fops = &rtrack_fops;
rt->vdev.ioctl_ops = &rtrack_ioctl_ops;
rt->vdev.release = video_device_release_empty;
video_set_drvdata(&rt->vdev, rt);
/* Set up the I/O locking */
mutex_init(&rt->lock);
/* mute card - prevents noisy bootups */
/* this ensures that the volume is all the way down */
outb(0x48, rt->io); /* volume down but still "on" */
msleep(2000); /* make sure it's totally down */
outb(0xc0, rt->io); /* steady volume, mute card */
if (video_register_device(&rt->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
v4l2_device_unregister(&rt->v4l2_dev);
release_region(rt->io, 2);
return -EINVAL;
}
v4l2_info(v4l2_dev, "AIMSlab RadioTrack/RadioReveal card driver.\n");
return 0;
}
static void __exit rtrack_exit(void)
{
struct rtrack *rt = &rtrack_card;
video_unregister_device(&rt->vdev);
v4l2_device_unregister(&rt->v4l2_dev);
release_region(rt->io, 2);
}
module_init(rtrack_init);
module_exit(rtrack_exit);