- 根目录:
- drivers
- media
- radio
- radio-aztech.c
/* radio-aztech.c - Aztech radio card driver for Linux 2.2
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
* Adapted to support the Video for Linux API by
* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
*
* 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)
*
* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
* along with more information on the card itself.
*
* History:
* 1999-02-24 Russell Kroll <rkroll@exploits.org>
* Fine tuning/VIDEO_TUNER_LOW
* Range expanded to 87-108 MHz (from 87.9-107.8)
*
* Notable changes from the original source:
* - includes stripped down to the essentials
* - for loops used as delays replaced with udelay()
* - #defines removed, changed to static values
* - tuning structure changed - no more character arrays, other changes
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <linux/videodev2.h> /* kernel radio structs */
#include <linux/io.h> /* outb, outb_p */
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Aztech radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.3");
/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
#ifndef CONFIG_RADIO_AZTECH_PORT
#define CONFIG_RADIO_AZTECH_PORT -1
#endif
static int io = CONFIG_RADIO_AZTECH_PORT;
static int radio_nr = -1;
static int radio_wait_time = 1000;
module_param(io, int, 0);
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
struct aztech
{
struct v4l2_device v4l2_dev;
struct video_device vdev;
int io;
int curvol;
unsigned long curfreq;
int stereo;
struct mutex lock;
};
static struct aztech aztech_card;
static int volconvert(int level)
{
level >>= 14; /* Map 16bits down to 2 bit */
level &= 3;
/* convert to card-friendly values */
switch (level) {
case 0:
return 0;
case 1:
return 1;
case 2:
return 4;
case 3:
return 5;
}
return 0; /* Quieten gcc */
}
static void send_0_byte(struct aztech *az)
{
udelay(radio_wait_time);
outb_p(2 + volconvert(az->curvol), az->io);
outb_p(64 + 2 + volconvert(az->curvol), az->io);
}
static void send_1_byte(struct aztech *az)
{
udelay (radio_wait_time);
outb_p(128 + 2 + volconvert(az->curvol), az->io);
outb_p(128 + 64 + 2 + volconvert(az->curvol), az->io);
}
static int az_setvol(struct aztech *az, int vol)
{
mutex_lock(&az->lock);
outb(volconvert(vol), az->io);
mutex_unlock(&az->lock);
return 0;
}
/* thanks to Michael Dwyer for giving me a dose of clues in
* the signal strength department..
*
* This card has a stereo bit - bit 0 set = mono, not set = stereo
* It also has a "signal" bit - bit 1 set = bad signal, not set = good
*
*/
static int az_getsigstr(struct aztech *az)
{
int sig = 1;
mutex_lock(&az->lock);
if (inb(az->io) & 2) /* bit set = no signal present */
sig = 0;
mutex_unlock(&az->lock);
return sig;
}
static int az_getstereo(struct aztech *az)
{
int stereo = 1;
mutex_lock(&az->lock);
if (inb(az->io) & 1) /* bit set = mono */
stereo = 0;
mutex_unlock(&az->lock);
return stereo;
}
static int az_setfreq(struct aztech *az, unsigned long frequency)
{
int i;
mutex_lock(&az->lock);
az->curfreq = frequency;
frequency += 171200; /* Add 10.7 MHz IF */
frequency /= 800; /* Convert to 50 kHz units */
send_0_byte(az); /* 0: LSB of frequency */
for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
if (frequency & (1 << i))
send_1_byte(az);
else
send_0_byte(az);
send_0_byte(az); /* 14: test bit - always 0 */
send_0_byte(az); /* 15: test bit - always 0 */
send_0_byte(az); /* 16: band data 0 - always 0 */
if (az->stereo) /* 17: stereo (1 to enable) */
send_1_byte(az);
else
send_0_byte(az);
send_1_byte(az); /* 18: band data 1 - unknown */
send_0_byte(az); /* 19: time base - always 0 */
send_0_byte(az); /* 20: spacing (0 = 25 kHz) */
send_1_byte(az); /* 21: spacing (1 = 25 kHz) */
send_0_byte(az); /* 22: spacing (0 = 25 kHz) */
send_1_byte(az); /* 23: AM/FM (FM = 1, always) */
/* latch frequency */
udelay(radio_wait_time);
outb_p(128 + 64 + volconvert(az->curvol), az->io);
mutex_unlock(&az->lock);
return 0;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "radio-aztech", sizeof(v->driver));
strlcpy(v->card, "Aztech Radio", sizeof(v->card));
strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
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 aztech *az = 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 | V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_LOW;
if (az_getstereo(az))
v->audmode = V4L2_TUNER_MODE_STEREO;
else
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal = 0xFFFF * az_getsigstr(az);
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
return v->index ? -EINVAL : 0;
}
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 int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct aztech *az = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
az_setfreq(az, f->frequency);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct aztech *az = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = az->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 aztech *az = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (az->curvol == 0)
ctrl->value = 1;
else
ctrl->value = 0;
return 0;
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = az->curvol * 6554;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct aztech *az = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value)
az_setvol(az, 0);
else
az_setvol(az, az->curvol);
return 0;
case V4L2_CID_AUDIO_VOLUME:
az_setvol(az, ctrl->value);
return 0;
}
return -EINVAL;
}
static const struct v4l2_file_operations aztech_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops aztech_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 aztech_init(void)
{
struct aztech *az = &aztech_card;
struct v4l2_device *v4l2_dev = &az->v4l2_dev;
int res;
strlcpy(v4l2_dev->name, "aztech", sizeof(v4l2_dev->name));
az->io = io;
if (az->io == -1) {
v4l2_err(v4l2_dev, "you must set an I/O address with io=0x350 or 0x358\n");
return -EINVAL;
}
if (!request_region(az->io, 2, "aztech")) {
v4l2_err(v4l2_dev, "port 0x%x already in use\n", az->io);
return -EBUSY;
}
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
release_region(az->io, 2);
v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
return res;
}
mutex_init(&az->lock);
strlcpy(az->vdev.name, v4l2_dev->name, sizeof(az->vdev.name));
az->vdev.v4l2_dev = v4l2_dev;
az->vdev.fops = &aztech_fops;
az->vdev.ioctl_ops = &aztech_ioctl_ops;
az->vdev.release = video_device_release_empty;
video_set_drvdata(&az->vdev, az);
/* mute card - prevents noisy bootups */
outb(0, az->io);
if (video_register_device(&az->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
v4l2_device_unregister(v4l2_dev);
release_region(az->io, 2);
return -EINVAL;
}
v4l2_info(v4l2_dev, "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
return 0;
}
static void __exit aztech_exit(void)
{
struct aztech *az = &aztech_card;
video_unregister_device(&az->vdev);
v4l2_device_unregister(&az->v4l2_dev);
release_region(az->io, 2);
}
module_init(aztech_init);
module_exit(aztech_exit);