[media] snd_tea575x: Add support for tuning AM
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>
diff --git a/sound/i2c/other/tea575x-tuner.c b/sound/i2c/other/tea575x-tuner.c
index d14edb7..88bbd88 100644
--- a/sound/i2c/other/tea575x-tuner.c
+++ b/sound/i2c/other/tea575x-tuner.c
@@ -37,9 +37,6 @@
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
*/
@@ -50,8 +47,8 @@
#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 */
@@ -62,6 +59,37 @@
#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
*/
@@ -133,16 +161,29 @@
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)
@@ -152,19 +193,35 @@
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);
@@ -190,23 +247,57 @@
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;
@@ -218,13 +309,17 @@
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;
}
@@ -248,8 +343,15 @@
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;
}
@@ -259,13 +361,35 @@
{
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;
@@ -297,10 +421,10 @@
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);
@@ -344,6 +468,7 @@
.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,