linux/drivers/media/radio/radio-aztech.c
Hans Verkuil b24c20cc5b V4L/DVB (10894): ISA radio drivers: improve kernel log message
It's much nicer if the log message tells you which io ports are possible,
rather than having to run modinfo or look it up in the source or manual.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-03-30 12:43:13 -03:00

411 lines
9.8 KiB
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/version.h> /* for KERNEL_VERSION MACRO */
#include <linux/io.h> /* outb, outb_p */
#include <linux/uaccess.h> /* copy to/from user */
#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");
/* 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)");
#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
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->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 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);
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);
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 int aztech_open(struct file *file)
{
return 0;
}
static int aztech_release(struct file *file)
{
return 0;
}
static const struct v4l2_file_operations aztech_fops = {
.owner = THIS_MODULE,
.open = aztech_open,
.release = aztech_release,
.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);
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");
/* mute card - prevents noisy bootups */
outb(0, az->io);
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);