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[media] radio-cadet: implement frequency band enumeration 

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-07-10 08:26:04 -03:00 committed by Mauro Carvalho Chehab
parent cc0d32665f
commit 6652c716a5
1 changed files with 74 additions and 57 deletions
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131
drivers/media/radio/radio-cadet.c
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@ -66,7 +66,8 @@ struct cadet {
struct video_device vdev;
struct v4l2_ctrl_handler ctrl_handler;
int io;
int curtuner;
bool is_fm_band;
u32 curfreq;
int tunestat;
int sigstrength;
wait_queue_head_t read_queue;
@ -84,9 +85,9 @@ static struct cadet cadet_card;
* 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] = {
static u16 sigtable[2][4] = {
{ 1835, 2621, 4128, 65535 },
{ 2185, 4369, 13107, 65535 },
{ 1835, 2621, 4128, 65535 }
};
@ -94,7 +95,7 @@ static int cadet_getstereo(struct cadet *dev)
{
int ret = V4L2_TUNER_SUB_MONO;
if (dev->curtuner != 0) /* Only FM has stereo capability! */
if (!dev->is_fm_band) /* Only FM has stereo capability! */
return V4L2_TUNER_SUB_MONO;
outb(7, dev->io); /* Select tuner control */
@ -149,20 +150,18 @@ static unsigned cadet_getfreq(struct cadet *dev)
/*
* Convert to actual frequency
*/
if (dev->curtuner == 0) { /* FM */
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 */
}
if (dev->curtuner == 1) /* AM */
freq = ((fifo & 0x7fff) - 2010) * 16;
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;
}
@ -197,11 +196,12 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
int i, j, test;
int curvol;
dev->curfreq = freq;
/*
* Formulate a fifo command
*/
fifo = 0;
if (dev->curtuner == 0) { /* FM */
if (dev->is_fm_band) { /* FM */
test = 102400;
freq = freq / 16; /* Make it kHz */
freq += 10700; /* IF is 10700 kHz */
@ -213,10 +213,9 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
}
test = test >> 1;
}
}
if (dev->curtuner == 1) { /* AM */
fifo = (freq / 16) + 2010; /* Make it kHz */
fifo |= 0x100000; /* Select AM Band */
} else { /* AM */
fifo = (freq / 16) + 450; /* Make it kHz */
fifo |= 0x100000; /* Select AM Band */
}
/*
@ -239,7 +238,7 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
cadet_gettune(dev);
if ((dev->tunestat & 0x40) == 0) { /* Tuned */
dev->sigstrength = sigtable[dev->curtuner][j];
dev->sigstrength = sigtable[dev->is_fm_band][j];
goto reset_rds;
}
}
@ -338,39 +337,52 @@ static int vidioc_querycap(struct file *file, void *priv,
return 0;
}
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 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;
switch (v->index) {
case 0:
strlcpy(v->name, "FM", sizeof(v->name));
v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW;
v->rangelow = 1400000; /* 87.5 MHz */
v->rangehigh = 1728000; /* 108.0 MHz */
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);
v->audmode = V4L2_TUNER_MODE_STEREO;
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;
break;
case 1:
strlcpy(v->name, "AM", sizeof(v->name));
v->capability = V4L2_TUNER_CAP_LOW;
} else {
v->rangelow = 8320; /* 520 kHz */
v->rangehigh = 26400; /* 1650 kHz */
v->rxsubchans = V4L2_TUNER_SUB_MONO;
v->audmode = V4L2_TUNER_MODE_MONO;
break;
default:
return -EINVAL;
}
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = dev->sigstrength; /* We might need to modify scaling of this */
return 0;
}
@ -378,8 +390,17 @@ static int vidioc_g_tuner(struct file *file, void *priv,
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
if (v->index != 0 && v->index != 1)
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;
}
@ -388,10 +409,10 @@ static int vidioc_g_frequency(struct file *file, void *priv,
{
struct cadet *dev = video_drvdata(file);
if (f->tuner > 1)
if (f->tuner)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = cadet_getfreq(dev);
f->frequency = dev->curfreq;
return 0;
}
@ -401,20 +422,12 @@ static int vidioc_s_frequency(struct file *file, void *priv,
{
struct cadet *dev = video_drvdata(file);
if (f->type != V4L2_TUNER_RADIO)
return -EINVAL;
if (f->tuner == 0) {
if (f->frequency < 1400000)
f->frequency = 1400000;
else if (f->frequency > 1728000)
f->frequency = 1728000;
} else if (f->tuner == 1) {
if (f->frequency < 8320)
f->frequency = 8320;
else if (f->frequency > 26400)
f->frequency = 26400;
} else
if (f->tuner)
return -EINVAL;
dev->is_fm_band =
f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
clamp(f->frequency, bands[dev->is_fm_band].rangelow,
bands[dev->is_fm_band].rangehigh);
cadet_setfreq(dev, f->frequency);
return 0;
}
@ -499,6 +512,7 @@ static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
.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,
@ -555,8 +569,8 @@ static void cadet_probe(struct cadet *dev)
for (i = 0; i < 8; i++) {
dev->io = iovals[i];
if (request_region(dev->io, 2, "cadet-probe")) {
cadet_setfreq(dev, 1410);
if (cadet_getfreq(dev) == 1410) {
cadet_setfreq(dev, bands[1].rangelow);
if (cadet_getfreq(dev) == bands[1].rangelow) {
release_region(dev->io, 2);
return;
}
@ -619,6 +633,9 @@ static int __init cadet_init(void)
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;