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[media] snd_tea575x: Add support for tuning AM
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Add support for tuning AM (on devices with the necessary additional
hardware components), and advertise the available bands using the new
VIDIOC_ENUM_FREQ_BANDS ioctl.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
CC: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Hans de Goede authored and Mauro Carvalho Chehab committed Sep 13, 2012
1 parent 355a4d0 commit fc48851
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Showing 3 changed files with 165 additions and 36 deletions.
1 change: 1 addition & 0 deletions drivers/media/radio/radio-shark.c
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,7 @@ static int usb_shark_probe(struct usb_interface *intf,
shark->tea.radio_nr = -1;
shark->tea.ops = &shark_tea_ops;
shark->tea.cannot_mute = true;
shark->tea.has_am = true;
strlcpy(shark->tea.card, "Griffin radioSHARK",
sizeof(shark->tea.card));
usb_make_path(shark->usbdev, shark->tea.bus_info,
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3 changes: 3 additions & 0 deletions include/sound/tea575x-tuner.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
#include <media/v4l2-device.h>

#define TEA575X_FMIF 10700
#define TEA575X_AMIF 450

#define TEA575X_DATA (1 << 0)
#define TEA575X_CLK (1 << 1)
Expand All @@ -52,12 +53,14 @@ struct snd_tea575x {
struct video_device vd; /* video device */
int radio_nr; /* radio_nr */
bool tea5759; /* 5759 chip is present */
bool has_am; /* Device can tune to AM freqs */
bool cannot_read_data; /* Device cannot read the data pin */
bool cannot_mute; /* Device cannot mute */
bool mute; /* Device is muted? */
bool stereo; /* receiving stereo */
bool tuned; /* tuned to a station */
unsigned int val; /* hw value */
u32 band; /* 0: FM, 1: FM-Japan, 2: AM */
u32 freq; /* frequency */
struct mutex mutex;
struct snd_tea575x_ops *ops;
Expand Down
197 changes: 161 additions & 36 deletions sound/i2c/other/tea575x-tuner.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,9 +37,6 @@ MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");

#define FREQ_LO ((tea->tea5759 ? 760 : 875) * 1600U)
#define FREQ_HI ((tea->tea5759 ? 910 : 1080) * 1600U)

/*
* definitions
*/
Expand All @@ -50,8 +47,8 @@ MODULE_LICENSE("GPL");
#define TEA575X_BIT_BAND_MASK (3<<20)
#define TEA575X_BIT_BAND_FM (0<<20)
#define TEA575X_BIT_BAND_MW (1<<20)
#define TEA575X_BIT_BAND_LW (1<<21)
#define TEA575X_BIT_BAND_SW (1<<22)
#define TEA575X_BIT_BAND_LW (2<<20)
#define TEA575X_BIT_BAND_SW (3<<20)
#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
Expand All @@ -62,6 +59,37 @@ MODULE_LICENSE("GPL");
#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
#define TEA575X_BIT_FREQ_MASK 0x7fff

enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };

static const struct v4l2_frequency_band bands[] = {
{
.type = V4L2_TUNER_RADIO,
.index = 0,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 87500 * 16,
.rangehigh = 108000 * 16,
.modulation = V4L2_BAND_MODULATION_FM,
},
{
.type = V4L2_TUNER_RADIO,
.index = 0,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 76000 * 16,
.rangehigh = 91000 * 16,
.modulation = V4L2_BAND_MODULATION_FM,
},
{
.type = V4L2_TUNER_RADIO,
.index = 1,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 530 * 16,
.rangehigh = 1710 * 16,
.modulation = V4L2_BAND_MODULATION_AM,
},
};

/*
* lowlevel part
*/
Expand Down Expand Up @@ -133,16 +161,29 @@ static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
if (freq == 0)
return freq;

/* freq *= 12.5 */
freq *= 125;
freq /= 10;
/* crystal fixup */
if (tea->tea5759)
freq += TEA575X_FMIF;
else
switch (tea->band) {
case BAND_FM:
/* freq *= 12.5 */
freq *= 125;
freq /= 10;
/* crystal fixup */
freq -= TEA575X_FMIF;
break;
case BAND_FM_JAPAN:
/* freq *= 12.5 */
freq *= 125;
freq /= 10;
/* crystal fixup */
freq += TEA575X_FMIF;
break;
case BAND_AM:
/* crystal fixup */
freq -= TEA575X_AMIF;
break;
}

return clamp(freq * 16, FREQ_LO, FREQ_HI); /* from kHz */
return clamp(freq * 16, bands[tea->band].rangelow,
bands[tea->band].rangehigh); /* from kHz */
}

static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
Expand All @@ -152,19 +193,35 @@ static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)

static void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
u32 freq = tea->freq;
u32 freq = tea->freq / 16; /* to kHz */
u32 band = 0;

freq /= 16; /* to kHz */
/* crystal fixup */
if (tea->tea5759)
freq -= TEA575X_FMIF;
else
switch (tea->band) {
case BAND_FM:
band = TEA575X_BIT_BAND_FM;
/* crystal fixup */
freq += TEA575X_FMIF;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
break;
case BAND_FM_JAPAN:
band = TEA575X_BIT_BAND_FM;
/* crystal fixup */
freq -= TEA575X_FMIF;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
break;
case BAND_AM:
band = TEA575X_BIT_BAND_MW;
/* crystal fixup */
freq += TEA575X_AMIF;
break;
}

tea->val &= ~TEA575X_BIT_FREQ_MASK;
tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
tea->val |= band;
tea->val |= freq & TEA575X_BIT_FREQ_MASK;
snd_tea575x_write(tea, tea->val);
tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
Expand All @@ -190,23 +247,57 @@ static int vidioc_querycap(struct file *file, void *priv,
return 0;
}

static int vidioc_enum_freq_bands(struct file *file, void *priv,
struct v4l2_frequency_band *band)
{
struct snd_tea575x *tea = video_drvdata(file);
int index;

if (band->tuner != 0)
return -EINVAL;

switch (band->index) {
case 0:
if (tea->tea5759)
index = BAND_FM_JAPAN;
else
index = BAND_FM;
break;
case 1:
if (tea->has_am) {
index = BAND_AM;
break;
}
/* Fall through */
default:
return -EINVAL;
}

*band = bands[index];
if (!tea->cannot_read_data)
band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;

return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct snd_tea575x *tea = video_drvdata(file);
struct v4l2_frequency_band band_fm = { 0, };

if (v->index > 0)
return -EINVAL;

snd_tea575x_read(tea);
vidioc_enum_freq_bands(file, priv, &band_fm);

strcpy(v->name, "FM");
memset(v, 0, sizeof(*v));
strlcpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
if (!tea->cannot_read_data)
v->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
v->rangelow = FREQ_LO;
v->rangehigh = FREQ_HI;
v->capability = band_fm.capability;
v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
v->rangehigh = band_fm.rangehigh;
v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
v->audmode = (tea->val & TEA575X_BIT_MONO) ?
V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
Expand All @@ -218,13 +309,17 @@ static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct snd_tea575x *tea = video_drvdata(file);
u32 orig_val = tea->val;

if (v->index)
return -EINVAL;
tea->val &= ~TEA575X_BIT_MONO;
if (v->audmode == V4L2_TUNER_MODE_MONO)
tea->val |= TEA575X_BIT_MONO;
snd_tea575x_write(tea, tea->val);
/* Only apply changes if currently tuning FM */
if (tea->band != BAND_AM && tea->val != orig_val)
snd_tea575x_set_freq(tea);

return 0;
}

Expand All @@ -248,8 +343,15 @@ static int vidioc_s_frequency(struct file *file, void *priv,
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;

tea->val &= ~TEA575X_BIT_SEARCH;
tea->freq = clamp(f->frequency, FREQ_LO, FREQ_HI);
if (tea->has_am && f->frequency < (20000 * 16))
tea->band = BAND_AM;
else if (tea->tea5759)
tea->band = BAND_FM_JAPAN;
else
tea->band = BAND_FM;

tea->freq = clamp(f->frequency, bands[tea->band].rangelow,
bands[tea->band].rangehigh);
snd_tea575x_set_freq(tea);
return 0;
}
Expand All @@ -259,13 +361,35 @@ static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
{
struct snd_tea575x *tea = video_drvdata(file);
unsigned long timeout;
int i;
int i, spacing;

if (tea->cannot_read_data)
return -ENOTTY;
if (a->tuner || a->wrap_around)
return -EINVAL;

if (a->rangelow || a->rangehigh) {
for (i = 0; i < ARRAY_SIZE(bands); i++) {
if ((i == BAND_FM && tea->tea5759) ||
(i == BAND_FM_JAPAN && !tea->tea5759) ||
(i == BAND_AM && !tea->has_am))
continue;
if (bands[i].rangelow == a->rangelow &&
bands[i].rangehigh == a->rangehigh)
break;
}
if (i == ARRAY_SIZE(bands))
return -EINVAL; /* No matching band found */
if (i != tea->band) {
tea->band = i;
tea->freq = clamp(tea->freq, bands[i].rangelow,
bands[i].rangehigh);
snd_tea575x_set_freq(tea);
}
}

spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */

/* clear the frequency, HW will fill it in */
tea->val &= ~TEA575X_BIT_FREQ_MASK;
tea->val |= TEA575X_BIT_SEARCH;
Expand Down Expand Up @@ -297,10 +421,10 @@ static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
if (freq == 0) /* shouldn't happen */
break;
/*
* if we moved by less than 50 kHz, or in the wrong
* direction, continue seeking
* if we moved by less than the spacing, or in the
* wrong direction, continue seeking
*/
if (abs(tea->freq - freq) < 16 * 50 ||
if (abs(tea->freq - freq) < 16 * spacing ||
(a->seek_upward && freq < tea->freq) ||
(!a->seek_upward && freq > tea->freq)) {
snd_tea575x_write(tea, tea->val);
Expand Down Expand Up @@ -344,6 +468,7 @@ static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
.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,
Expand Down

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