mirror of https://gitee.com/openkylin/linux.git
[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
Mauro Carvalho Chehab
parent
cc0d32665f
commit
6652c716a5
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@ -66,7 +66,8 @@ struct cadet {
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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int io;
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int curtuner;
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bool is_fm_band;
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u32 curfreq;
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int tunestat;
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int sigstrength;
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wait_queue_head_t read_queue;
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@ -84,9 +85,9 @@ static struct cadet cadet_card;
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* The V4L API spec does not define any particular unit for the signal
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* strength value. These values are in microvolts of RF at the tuner's input.
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*/
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static __u16 sigtable[2][4] = {
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static u16 sigtable[2][4] = {
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{ 1835, 2621, 4128, 65535 },
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{ 2185, 4369, 13107, 65535 },
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{ 1835, 2621, 4128, 65535 }
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};
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@ -94,7 +95,7 @@ static int cadet_getstereo(struct cadet *dev)
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{
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int ret = V4L2_TUNER_SUB_MONO;
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if (dev->curtuner != 0) /* Only FM has stereo capability! */
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if (!dev->is_fm_band) /* Only FM has stereo capability! */
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return V4L2_TUNER_SUB_MONO;
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outb(7, dev->io); /* Select tuner control */
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@ -149,20 +150,18 @@ static unsigned cadet_getfreq(struct cadet *dev)
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/*
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* Convert to actual frequency
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*/
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if (dev->curtuner == 0) { /* FM */
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test = 12500;
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for (i = 0; i < 14; i++) {
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if ((fifo & 0x01) != 0)
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freq += test;
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test = test << 1;
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fifo = fifo >> 1;
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}
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freq -= 10700000; /* IF frequency is 10.7 MHz */
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freq = (freq * 16) / 1000; /* Make it 1/16 kHz */
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}
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if (dev->curtuner == 1) /* AM */
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freq = ((fifo & 0x7fff) - 2010) * 16;
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if (!dev->is_fm_band) /* AM */
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return ((fifo & 0x7fff) - 450) * 16;
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test = 12500;
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for (i = 0; i < 14; i++) {
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if ((fifo & 0x01) != 0)
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freq += test;
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test = test << 1;
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fifo = fifo >> 1;
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}
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freq -= 10700000; /* IF frequency is 10.7 MHz */
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freq = (freq * 16) / 1000; /* Make it 1/16 kHz */
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return freq;
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}
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@ -197,11 +196,12 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
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int i, j, test;
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int curvol;
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dev->curfreq = freq;
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/*
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* Formulate a fifo command
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*/
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fifo = 0;
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if (dev->curtuner == 0) { /* FM */
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if (dev->is_fm_band) { /* FM */
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test = 102400;
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freq = freq / 16; /* Make it kHz */
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freq += 10700; /* IF is 10700 kHz */
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@ -213,10 +213,9 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
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}
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test = test >> 1;
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}
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}
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if (dev->curtuner == 1) { /* AM */
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fifo = (freq / 16) + 2010; /* Make it kHz */
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fifo |= 0x100000; /* Select AM Band */
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} else { /* AM */
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fifo = (freq / 16) + 450; /* Make it kHz */
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fifo |= 0x100000; /* Select AM Band */
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}
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/*
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@ -239,7 +238,7 @@ static void cadet_setfreq(struct cadet *dev, unsigned freq)
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cadet_gettune(dev);
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if ((dev->tunestat & 0x40) == 0) { /* Tuned */
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dev->sigstrength = sigtable[dev->curtuner][j];
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dev->sigstrength = sigtable[dev->is_fm_band][j];
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goto reset_rds;
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}
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}
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@ -338,39 +337,52 @@ static int vidioc_querycap(struct file *file, void *priv,
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return 0;
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}
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static const struct v4l2_frequency_band bands[] = {
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{
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.index = 0,
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.type = V4L2_TUNER_RADIO,
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 8320, /* 520 kHz */
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.rangehigh = 26400, /* 1650 kHz */
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.modulation = V4L2_BAND_MODULATION_AM,
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}, {
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.index = 1,
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.type = V4L2_TUNER_RADIO,
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.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
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V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
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V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 1400000, /* 87.5 MHz */
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.rangehigh = 1728000, /* 108.0 MHz */
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.modulation = V4L2_BAND_MODULATION_FM,
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},
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};
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct cadet *dev = video_drvdata(file);
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if (v->index)
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return -EINVAL;
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v->type = V4L2_TUNER_RADIO;
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switch (v->index) {
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case 0:
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strlcpy(v->name, "FM", sizeof(v->name));
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v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
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V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW;
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v->rangelow = 1400000; /* 87.5 MHz */
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v->rangehigh = 1728000; /* 108.0 MHz */
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strlcpy(v->name, "Radio", sizeof(v->name));
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v->capability = bands[0].capability | bands[1].capability;
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v->rangelow = bands[0].rangelow; /* 520 kHz (start of AM band) */
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v->rangehigh = bands[1].rangehigh; /* 108.0 MHz (end of FM band) */
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if (dev->is_fm_band) {
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v->rxsubchans = cadet_getstereo(dev);
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v->audmode = V4L2_TUNER_MODE_STEREO;
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outb(3, dev->io);
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outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
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mdelay(100);
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outb(3, dev->io);
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if (inb(dev->io + 1) & 0x80)
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v->rxsubchans |= V4L2_TUNER_SUB_RDS;
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break;
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case 1:
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strlcpy(v->name, "AM", sizeof(v->name));
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v->capability = V4L2_TUNER_CAP_LOW;
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} else {
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v->rangelow = 8320; /* 520 kHz */
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v->rangehigh = 26400; /* 1650 kHz */
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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v->audmode = V4L2_TUNER_MODE_MONO;
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break;
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default:
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return -EINVAL;
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}
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->signal = dev->sigstrength; /* We might need to modify scaling of this */
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return 0;
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}
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@ -378,8 +390,17 @@ static int vidioc_g_tuner(struct file *file, void *priv,
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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if (v->index != 0 && v->index != 1)
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return v->index ? -EINVAL : 0;
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}
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static int vidioc_enum_freq_bands(struct file *file, void *priv,
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struct v4l2_frequency_band *band)
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{
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if (band->tuner)
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return -EINVAL;
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if (band->index >= ARRAY_SIZE(bands))
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return -EINVAL;
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*band = bands[band->index];
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return 0;
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}
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@ -388,10 +409,10 @@ static int vidioc_g_frequency(struct file *file, void *priv,
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{
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struct cadet *dev = video_drvdata(file);
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if (f->tuner > 1)
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if (f->tuner)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = cadet_getfreq(dev);
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f->frequency = dev->curfreq;
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return 0;
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}
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@ -401,20 +422,12 @@ static int vidioc_s_frequency(struct file *file, void *priv,
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{
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struct cadet *dev = video_drvdata(file);
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if (f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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if (f->tuner == 0) {
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if (f->frequency < 1400000)
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f->frequency = 1400000;
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else if (f->frequency > 1728000)
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f->frequency = 1728000;
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} else if (f->tuner == 1) {
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if (f->frequency < 8320)
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f->frequency = 8320;
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else if (f->frequency > 26400)
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f->frequency = 26400;
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} else
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if (f->tuner)
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return -EINVAL;
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dev->is_fm_band =
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f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
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clamp(f->frequency, bands[dev->is_fm_band].rangelow,
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bands[dev->is_fm_band].rangehigh);
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cadet_setfreq(dev, f->frequency);
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return 0;
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}
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@ -499,6 +512,7 @@ static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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@ -555,8 +569,8 @@ static void cadet_probe(struct cadet *dev)
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for (i = 0; i < 8; i++) {
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dev->io = iovals[i];
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if (request_region(dev->io, 2, "cadet-probe")) {
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cadet_setfreq(dev, 1410);
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if (cadet_getfreq(dev) == 1410) {
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cadet_setfreq(dev, bands[1].rangelow);
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if (cadet_getfreq(dev) == bands[1].rangelow) {
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release_region(dev->io, 2);
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return;
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}
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@ -619,6 +633,9 @@ static int __init cadet_init(void)
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goto err_hdl;
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}
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dev->is_fm_band = true;
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dev->curfreq = bands[dev->is_fm_band].rangelow;
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cadet_setfreq(dev, dev->curfreq);
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strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
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dev->vdev.v4l2_dev = v4l2_dev;
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dev->vdev.fops = &cadet_fops;
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