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linux-stable-rt/drivers/media/radio/radio-zoltrix.c

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/* zoltrix radio plus driver for Linux radio support
* (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
*
* BUGS
* Due to the inconsistency in reading from the signal flags
* it is difficult to get an accurate tuned signal.
*
* It seems that the card is not linear to 0 volume. It cuts off
* at a low volume, and it is not possible (at least I have not found)
* to get fine volume control over the low volume range.
*
* Some code derived from code by Romolo Manfredini
* romolo@bicnet.it
*
* 1999-05-06 - (C. van Schaik)
* - Make signal strength and stereo scans
* kinder to cpu while in delay
* 1999-01-05 - (C. van Schaik)
* - Changed tuning to 1/160Mhz accuracy
* - Added stereo support
* (card defaults to stereo)
* (can explicitly force mono on the card)
* (can detect if station is in stereo)
* - Added unmute function
* - Reworked ioctl functions
* 2002-07-15 - Fix Stereo typo
*
* 2006-07-24 - 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, msleep */
#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/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 = 4096,
.default_value = 0xff,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
#ifndef CONFIG_RADIO_ZOLTRIX_PORT
#define CONFIG_RADIO_ZOLTRIX_PORT -1
#endif
static int io = CONFIG_RADIO_ZOLTRIX_PORT;
static int radio_nr = -1;
struct zol_device {
int port;
int curvol;
unsigned long curfreq;
int muted;
unsigned int stereo;
struct mutex lock;
};
static int zol_setvol(struct zol_device *dev, int vol)
{
dev->curvol = vol;
if (dev->muted)
return 0;
mutex_lock(&dev->lock);
if (vol == 0) {
outb(0, io);
outb(0, io);
inb(io + 3); /* Zoltrix needs to be read to confirm */
mutex_unlock(&dev->lock);
return 0;
}
outb(dev->curvol-1, io);
msleep(10);
inb(io + 2);
mutex_unlock(&dev->lock);
return 0;
}
static void zol_mute(struct zol_device *dev)
{
dev->muted = 1;
mutex_lock(&dev->lock);
outb(0, io);
outb(0, io);
inb(io + 3); /* Zoltrix needs to be read to confirm */
mutex_unlock(&dev->lock);
}
static void zol_unmute(struct zol_device *dev)
{
dev->muted = 0;
zol_setvol(dev, dev->curvol);
}
static int zol_setfreq(struct zol_device *dev, unsigned long freq)
{
/* tunes the radio to the desired frequency */
unsigned long long bitmask, f, m;
unsigned int stereo = dev->stereo;
int i;
if (freq == 0)
return 1;
m = (freq / 160 - 8800) * 2;
f = (unsigned long long) m + 0x4d1c;
bitmask = 0xc480402c10080000ull;
i = 45;
mutex_lock(&dev->lock);
outb(0, io);
outb(0, io);
inb(io + 3); /* Zoltrix needs to be read to confirm */
outb(0x40, io);
outb(0xc0, io);
bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
while (i--) {
if ((bitmask & 0x8000000000000000ull) != 0) {
outb(0x80, io);
udelay(50);
outb(0x00, io);
udelay(50);
outb(0x80, io);
udelay(50);
} else {
outb(0xc0, io);
udelay(50);
outb(0x40, io);
udelay(50);
outb(0xc0, io);
udelay(50);
}
bitmask *= 2;
}
/* termination sequence */
outb(0x80, io);
outb(0xc0, io);
outb(0x40, io);
udelay(1000);
inb(io+2);
udelay(1000);
if (dev->muted)
{
outb(0, io);
outb(0, io);
inb(io + 3);
udelay(1000);
}
mutex_unlock(&dev->lock);
if(!dev->muted)
{
zol_setvol(dev, dev->curvol);
}
return 0;
}
/* Get signal strength */
static int zol_getsigstr(struct zol_device *dev)
{
int a, b;
mutex_lock(&dev->lock);
outb(0x00, io); /* This stuff I found to do nothing */
outb(dev->curvol, io);
msleep(20);
a = inb(io);
msleep(10);
b = inb(io);
mutex_unlock(&dev->lock);
if (a != b)
return (0);
if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
|| (a == 0xef)) /* with a binary scanner on the card io */
return (1);
return (0);
}
static int zol_is_stereo (struct zol_device *dev)
{
int x1, x2;
mutex_lock(&dev->lock);
outb(0x00, io);
outb(dev->curvol, io);
msleep(20);
x1 = inb(io);
msleep(10);
x2 = inb(io);
mutex_unlock(&dev->lock);
if ((x1 == x2) && (x1 == 0xcf))
return 1;
return 0;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "radio-zoltrix", sizeof(v->driver));
strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
sprintf(v->bus_info, "ISA");
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct video_device *dev = video_devdata(file);
struct zol_device *zol = dev->priv;
if (v->index > 0)
return -EINVAL;
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = (88*16000);
v->rangehigh = (108*16000);
v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_LOW;
if (zol_is_stereo(zol))
v->audmode = V4L2_TUNER_MODE_STEREO;
else
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal = 0xFFFF*zol_getsigstr(zol);
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
if (v->index > 0)
return -EINVAL;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct video_device *dev = video_devdata(file);
struct zol_device *zol = dev->priv;
zol->curfreq = f->frequency;
zol_setfreq(zol, zol->curfreq);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct video_device *dev = video_devdata(file);
struct zol_device *zol = dev->priv;
f->type = V4L2_TUNER_RADIO;
f->frequency = zol->curfreq;
return 0;
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
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;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct video_device *dev = video_devdata(file);
struct zol_device *zol = dev->priv;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = zol->muted;
return 0;
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = zol->curvol * 4096;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct video_device *dev = video_devdata(file);
struct zol_device *zol = dev->priv;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value)
zol_mute(zol);
else {
zol_unmute(zol);
zol_setvol(zol,zol->curvol);
}
return 0;
case V4L2_CID_AUDIO_VOLUME:
zol_setvol(zol,ctrl->value/4096);
return 0;
}
zol->stereo = 1;
zol_setfreq(zol, zol->curfreq);
#if 0
/* FIXME: Implement stereo/mono switch on V4L2 */
if (v->mode & VIDEO_SOUND_STEREO) {
zol->stereo = 1;
zol_setfreq(zol, zol->curfreq);
}
if (v->mode & VIDEO_SOUND_MONO) {
zol->stereo = 0;
zol_setfreq(zol, zol->curfreq);
}
#endif
return -EINVAL;
}
static int vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
if (a->index > 1)
return -EINVAL;
strcpy(a->name, "Radio");
a->capability = V4L2_AUDCAP_STEREO;
return 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)
{
if (i != 0)
return -EINVAL;
return 0;
}
static int vidioc_s_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
if (a->index != 0)
return -EINVAL;
return 0;
}
static struct zol_device zoltrix_unit;
static const struct file_operations zoltrix_fops =
{
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = video_ioctl2,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device zoltrix_radio =
{
.owner = THIS_MODULE,
.name = "Zoltrix Radio Plus",
.type = VID_TYPE_TUNER,
.hardware = 0,
.fops = &zoltrix_fops,
.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 zoltrix_init(void)
{
if (io == -1) {
printk(KERN_ERR "You must set an I/O address with io=0x???\n");
return -EINVAL;
}
if ((io != 0x20c) && (io != 0x30c)) {
printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
return -ENXIO;
}
zoltrix_radio.priv = &zoltrix_unit;
if (!request_region(io, 2, "zoltrix")) {
printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
return -EBUSY;
}
if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
{
release_region(io, 2);
return -EINVAL;
}
printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
mutex_init(&zoltrix_unit.lock);
/* mute card - prevents noisy bootups */
/* this ensures that the volume is all the way down */
outb(0, io);
outb(0, io);
msleep(20);
inb(io + 3);
zoltrix_unit.curvol = 0;
zoltrix_unit.stereo = 1;
return 0;
}
MODULE_AUTHOR("C.van Schaik");
MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
module_param(radio_nr, int, 0);
static void __exit zoltrix_cleanup_module(void)
{
video_unregister_device(&zoltrix_radio);
release_region(io, 2);
}
module_init(zoltrix_init);
module_exit(zoltrix_cleanup_module);
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