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linux-sg2042/drivers/media/radio/radio-cadet.c

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/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
*
* by Fred Gleason <fredg@wava.com>
* Version 0.3.3
*
* (Loosely) based on code for the Aztech radio card by
*
* Russell Kroll (rkroll@exploits.org)
* 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)
*
* History:
* 2000-04-29 Russell Kroll <rkroll@exploits.org>
* Added ISAPnP detection for Linux 2.3/2.4
*
* 2001-01-10 Russell Kroll <rkroll@exploits.org>
* Removed dead CONFIG_RADIO_CADET_PORT code
* PnP detection on load is now default (no args necessary)
*
* 2002-01-17 Adam Belay <ambx1@neo.rr.com>
* Updated to latest pnp code
*
* 2003-01-31 Alan Cox <alan@lxorguk.ukuu.org.uk>
* Cleaned up locking, delay code, general odds and ends
*
* 2006-07-30 Hans J. Koch <koch@hjk-az.de>
* Changed API to V4L2
*/
#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> /* V4L2 API defs */
#include <linux/param.h>
#include <linux/pnp.h>
#include <linux/sched.h>
#include <linux/io.h> /* outb, outb_p */
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.3.4");
static int io = -1; /* default to isapnp activation */
static int radio_nr = -1;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
module_param(radio_nr, int, 0);
#define RDS_BUFFER 256
#define RDS_RX_FLAG 1
#define MBS_RX_FLAG 2
struct cadet {
struct v4l2_device v4l2_dev;
struct video_device vdev;
struct v4l2_ctrl_handler ctrl_handler;
int io;
bool is_fm_band;
u32 curfreq;
int tunestat;
int sigstrength;
wait_queue_head_t read_queue;
struct timer_list readtimer;
u8 rdsin, rdsout, rdsstat;
unsigned char rdsbuf[RDS_BUFFER];
struct mutex lock;
int reading;
};
static struct cadet cadet_card;
/*
* Signal Strength Threshold Values
* The V4L API spec does not define any particular unit for the signal
* strength value. These values are in microvolts of RF at the tuner's input.
*/
static u16 sigtable[2][4] = {
{ 1835, 2621, 4128, 65535 },
{ 2185, 4369, 13107, 65535 },
};
static const struct v4l2_frequency_band bands[] = {
{
.index = 0,
.type = V4L2_TUNER_RADIO,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 8320, /* 520 kHz */
.rangehigh = 26400, /* 1650 kHz */
.modulation = V4L2_BAND_MODULATION_AM,
}, {
.index = 1,
.type = V4L2_TUNER_RADIO,
.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 1400000, /* 87.5 MHz */
.rangehigh = 1728000, /* 108.0 MHz */
.modulation = V4L2_BAND_MODULATION_FM,
},
};
static int cadet_getstereo(struct cadet *dev)
{
int ret = V4L2_TUNER_SUB_MONO;
if (!dev->is_fm_band) /* Only FM has stereo capability! */
return V4L2_TUNER_SUB_MONO;
outb(7, dev->io); /* Select tuner control */
if ((inb(dev->io + 1) & 0x40) == 0)
ret = V4L2_TUNER_SUB_STEREO;
return ret;
}
static unsigned cadet_gettune(struct cadet *dev)
{
int curvol, i;
unsigned fifo = 0;
/*
* Prepare for read
*/
outb(7, dev->io); /* Select tuner control */
curvol = inb(dev->io + 1); /* Save current volume/mute setting */
outb(0x00, dev->io + 1); /* Ensure WRITE-ENABLE is LOW */
dev->tunestat = 0xffff;
/*
* Read the shift register
*/
for (i = 0; i < 25; i++) {
fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
if (i < 24) {
outb(0x01, dev->io + 1);
dev->tunestat &= inb(dev->io + 1);
outb(0x00, dev->io + 1);
}
}
/*
* Restore volume/mute setting
*/
outb(curvol, dev->io + 1);
return fifo;
}
static unsigned cadet_getfreq(struct cadet *dev)
{
int i;
unsigned freq = 0, test, fifo = 0;
/*
* Read current tuning
*/
fifo = cadet_gettune(dev);
/*
* Convert to actual frequency
*/
if (!dev->is_fm_band) /* AM */
return ((fifo & 0x7fff) - 450) * 16;
test = 12500;
for (i = 0; i < 14; i++) {
if ((fifo & 0x01) != 0)
freq += test;
test = test << 1;
fifo = fifo >> 1;
}
freq -= 10700000; /* IF frequency is 10.7 MHz */
freq = (freq * 16) / 1000; /* Make it 1/16 kHz */
return freq;
}
static void cadet_settune(struct cadet *dev, unsigned fifo)
{
int i;
unsigned test;
outb(7, dev->io); /* Select tuner control */
/*
* Write the shift register
*/
test = 0;
test = (fifo >> 23) & 0x02; /* Align data for SDO */
test |= 0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
outb(7, dev->io); /* Select tuner control */
outb(test, dev->io + 1); /* Initialize for write */
for (i = 0; i < 25; i++) {
test |= 0x01; /* Toggle SCK High */
outb(test, dev->io + 1);
test &= 0xfe; /* Toggle SCK Low */
outb(test, dev->io + 1);
fifo = fifo << 1; /* Prepare the next bit */
test = 0x1c | ((fifo >> 23) & 0x02);
outb(test, dev->io + 1);
}
}
static void cadet_setfreq(struct cadet *dev, unsigned freq)
{
unsigned fifo;
int i, j, test;
int curvol;
freq = clamp(freq, bands[dev->is_fm_band].rangelow,
bands[dev->is_fm_band].rangehigh);
dev->curfreq = freq;
/*
* Formulate a fifo command
*/
fifo = 0;
if (dev->is_fm_band) { /* FM */
test = 102400;
freq = freq / 16; /* Make it kHz */
freq += 10700; /* IF is 10700 kHz */
for (i = 0; i < 14; i++) {
fifo = fifo << 1;
if (freq >= test) {
fifo |= 0x01;
freq -= test;
}
test = test >> 1;
}
} else { /* AM */
fifo = (freq / 16) + 450; /* Make it kHz */
fifo |= 0x100000; /* Select AM Band */
}
/*
* Save current volume/mute setting
*/
outb(7, dev->io); /* Select tuner control */
curvol = inb(dev->io + 1);
/*
* Tune the card
*/
for (j = 3; j > -1; j--) {
cadet_settune(dev, fifo | (j << 16));
outb(7, dev->io); /* Select tuner control */
outb(curvol, dev->io + 1);
msleep(100);
cadet_gettune(dev);
if ((dev->tunestat & 0x40) == 0) { /* Tuned */
dev->sigstrength = sigtable[dev->is_fm_band][j];
goto reset_rds;
}
}
dev->sigstrength = 0;
reset_rds:
outb(3, dev->io);
outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
}
static bool cadet_has_rds_data(struct cadet *dev)
{
bool result;
mutex_lock(&dev->lock);
result = dev->rdsin != dev->rdsout;
mutex_unlock(&dev->lock);
return result;
}
static void cadet_handler(unsigned long data)
{
struct cadet *dev = (void *)data;
/* Service the RDS fifo */
if (mutex_trylock(&dev->lock)) {
outb(0x3, dev->io); /* Select RDS Decoder Control */
if ((inb(dev->io + 1) & 0x20) != 0)
pr_err("cadet: RDS fifo overflow\n");
outb(0x80, dev->io); /* Select RDS fifo */
while ((inb(dev->io) & 0x80) != 0) {
dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
if (dev->rdsin + 1 != dev->rdsout)
dev->rdsin++;
}
mutex_unlock(&dev->lock);
}
/*
* Service pending read
*/
if (cadet_has_rds_data(dev))
wake_up_interruptible(&dev->read_queue);
/*
* Clean up and exit
*/
init_timer(&dev->readtimer);
dev->readtimer.function = cadet_handler;
dev->readtimer.data = data;
dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
add_timer(&dev->readtimer);
}
static void cadet_start_rds(struct cadet *dev)
{
dev->rdsstat = 1;
outb(0x80, dev->io); /* Select RDS fifo */
init_timer(&dev->readtimer);
dev->readtimer.function = cadet_handler;
dev->readtimer.data = (unsigned long)dev;
dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
add_timer(&dev->readtimer);
}
static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
struct cadet *dev = video_drvdata(file);
unsigned char readbuf[RDS_BUFFER];
int i = 0;
mutex_lock(&dev->lock);
if (dev->rdsstat == 0)
cadet_start_rds(dev);
mutex_unlock(&dev->lock);
if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK))
return -EWOULDBLOCK;
i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev));
if (i)
return i;
mutex_lock(&dev->lock);
while (i < count && dev->rdsin != dev->rdsout)
readbuf[i++] = dev->rdsbuf[dev->rdsout++];
mutex_unlock(&dev->lock);
if (i && copy_to_user(data, readbuf, i))
return -EFAULT;
return i;
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
strlcpy(v->card, "ADS Cadet", sizeof(v->card));
strlcpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info));
v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct cadet *dev = video_drvdata(file);
if (v->index)
return -EINVAL;
v->type = V4L2_TUNER_RADIO;
strlcpy(v->name, "Radio", sizeof(v->name));
v->capability = bands[0].capability | bands[1].capability;
v->rangelow = bands[0].rangelow; /* 520 kHz (start of AM band) */
v->rangehigh = bands[1].rangehigh; /* 108.0 MHz (end of FM band) */
if (dev->is_fm_band) {
v->rxsubchans = cadet_getstereo(dev);
outb(3, dev->io);
outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
mdelay(100);
outb(3, dev->io);
if (inb(dev->io + 1) & 0x80)
v->rxsubchans |= V4L2_TUNER_SUB_RDS;
} else {
v->rangelow = 8320; /* 520 kHz */
v->rangehigh = 26400; /* 1650 kHz */
v->rxsubchans = V4L2_TUNER_SUB_MONO;
}
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = dev->sigstrength; /* We might need to modify scaling of this */
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *v)
{
return v->index ? -EINVAL : 0;
}
static int vidioc_enum_freq_bands(struct file *file, void *priv,
struct v4l2_frequency_band *band)
{
if (band->tuner)
return -EINVAL;
if (band->index >= ARRAY_SIZE(bands))
return -EINVAL;
*band = bands[band->index];
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct cadet *dev = video_drvdata(file);
if (f->tuner)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = dev->curfreq;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct cadet *dev = video_drvdata(file);
if (f->tuner)
return -EINVAL;
dev->is_fm_band =
f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
cadet_setfreq(dev, f->frequency);
return 0;
}
static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
outb(7, dev->io); /* Select tuner control */
if (ctrl->val)
outb(0x00, dev->io + 1);
else
outb(0x20, dev->io + 1);
return 0;
}
return -EINVAL;
}
static int cadet_open(struct file *file)
{
struct cadet *dev = video_drvdata(file);
int err;
mutex_lock(&dev->lock);
err = v4l2_fh_open(file);
if (err)
goto fail;
if (v4l2_fh_is_singular_file(file))
init_waitqueue_head(&dev->read_queue);
fail:
mutex_unlock(&dev->lock);
return err;
}
static int cadet_release(struct file *file)
{
struct cadet *dev = video_drvdata(file);
mutex_lock(&dev->lock);
if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
del_timer_sync(&dev->readtimer);
dev->rdsstat = 0;
}
v4l2_fh_release(file);
mutex_unlock(&dev->lock);
return 0;
}
static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
{
struct cadet *dev = video_drvdata(file);
unsigned long req_events = poll_requested_events(wait);
unsigned int res = v4l2_ctrl_poll(file, wait);
poll_wait(file, &dev->read_queue, wait);
if (dev->rdsstat == 0 && (req_events & (POLLIN | POLLRDNORM))) {
mutex_lock(&dev->lock);
if (dev->rdsstat == 0)
cadet_start_rds(dev);
mutex_unlock(&dev->lock);
}
if (cadet_has_rds_data(dev))
res |= POLLIN | POLLRDNORM;
return res;
}
static const struct v4l2_file_operations cadet_fops = {
.owner = THIS_MODULE,
.open = cadet_open,
.release = cadet_release,
.read = cadet_read,
.unlocked_ioctl = video_ioctl2,
.poll = cadet_poll,
};
static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_g_tuner = vidioc_g_tuner,
.vidioc_s_tuner = vidioc_s_tuner,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
.s_ctrl = cadet_s_ctrl,
};
#ifdef CONFIG_PNP
static struct pnp_device_id cadet_pnp_devices[] = {
/* ADS Cadet AM/FM Radio Card */
{.id = "MSM0c24", .driver_data = 0},
{.id = ""}
};
MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
if (!dev)
return -ENODEV;
/* only support one device */
if (io > 0)
return -EBUSY;
if (!pnp_port_valid(dev, 0))
return -ENODEV;
io = pnp_port_start(dev, 0);
printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
return io;
}
static struct pnp_driver cadet_pnp_driver = {
.name = "radio-cadet",
.id_table = cadet_pnp_devices,
.probe = cadet_pnp_probe,
.remove = NULL,
};
#else
static struct pnp_driver cadet_pnp_driver;
#endif
static void cadet_probe(struct cadet *dev)
{
static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
int i;
for (i = 0; i < 8; i++) {
dev->io = iovals[i];
if (request_region(dev->io, 2, "cadet-probe")) {
cadet_setfreq(dev, bands[1].rangelow);
if (cadet_getfreq(dev) == bands[1].rangelow) {
release_region(dev->io, 2);
return;
}
release_region(dev->io, 2);
}
}
dev->io = -1;
}
/*
* io should only be set if the user has used something like
* isapnp (the userspace program) to initialize this card for us
*/
static int __init cadet_init(void)
{
struct cadet *dev = &cadet_card;
struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
struct v4l2_ctrl_handler *hdl;
int res = -ENODEV;
strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
mutex_init(&dev->lock);
/* If a probe was requested then probe ISAPnP first (safest) */
if (io < 0)
pnp_register_driver(&cadet_pnp_driver);
dev->io = io;
/* If that fails then probe unsafely if probe is requested */
if (dev->io < 0)
cadet_probe(dev);
/* Else we bail out */
if (dev->io < 0) {
#ifdef MODULE
v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
#endif
goto fail;
}
if (!request_region(dev->io, 2, "cadet"))
goto fail;
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
release_region(dev->io, 2);
v4l2_err(v4l2_dev, "could not register v4l2_device\n");
goto fail;
}
hdl = &dev->ctrl_handler;
v4l2_ctrl_handler_init(hdl, 2);
v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
v4l2_dev->ctrl_handler = hdl;
if (hdl->error) {
res = hdl->error;
v4l2_err(v4l2_dev, "Could not register controls\n");
goto err_hdl;
}
dev->is_fm_band = true;
dev->curfreq = bands[dev->is_fm_band].rangelow;
cadet_setfreq(dev, dev->curfreq);
strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
dev->vdev.v4l2_dev = v4l2_dev;
dev->vdev.fops = &cadet_fops;
dev->vdev.ioctl_ops = &cadet_ioctl_ops;
dev->vdev.release = video_device_release_empty;
dev->vdev.lock = &dev->lock;
video_set_drvdata(&dev->vdev, dev);
res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);
if (res < 0)
goto err_hdl;
v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
return 0;
err_hdl:
v4l2_ctrl_handler_free(hdl);
v4l2_device_unregister(v4l2_dev);
release_region(dev->io, 2);
fail:
pnp_unregister_driver(&cadet_pnp_driver);
return res;
}
static void __exit cadet_exit(void)
{
struct cadet *dev = &cadet_card;
video_unregister_device(&dev->vdev);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
v4l2_device_unregister(&dev->v4l2_dev);
outb(7, dev->io); /* Mute */
outb(0x00, dev->io + 1);
release_region(dev->io, 2);
pnp_unregister_driver(&cadet_pnp_driver);
}
module_init(cadet_init);
module_exit(cadet_exit);
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