[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>
This commit is contained in:
Hans de Goede
Mauro Carvalho Chehab
parent
355a4d01bd
commit
fc488517cc
3 changed files with 165 additions and 36 deletions
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@ -333,6 +333,7 @@ static int usb_shark_probe(struct usb_interface *intf,
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shark->tea.radio_nr = -1;
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shark->tea.ops = &shark_tea_ops;
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shark->tea.cannot_mute = true;
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shark->tea.has_am = true;
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strlcpy(shark->tea.card, "Griffin radioSHARK",
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sizeof(shark->tea.card));
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usb_make_path(shark->usbdev, shark->tea.bus_info,
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@ -28,6 +28,7 @@
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#include <media/v4l2-device.h>
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#define TEA575X_FMIF 10700
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#define TEA575X_AMIF 450
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#define TEA575X_DATA (1 << 0)
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#define TEA575X_CLK (1 << 1)
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@ -52,12 +53,14 @@ struct snd_tea575x {
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struct video_device vd; /* video device */
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int radio_nr; /* radio_nr */
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bool tea5759; /* 5759 chip is present */
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bool has_am; /* Device can tune to AM freqs */
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bool cannot_read_data; /* Device cannot read the data pin */
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bool cannot_mute; /* Device cannot mute */
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bool mute; /* Device is muted? */
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bool stereo; /* receiving stereo */
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bool tuned; /* tuned to a station */
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unsigned int val; /* hw value */
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u32 band; /* 0: FM, 1: FM-Japan, 2: AM */
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u32 freq; /* frequency */
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struct mutex mutex;
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struct snd_tea575x_ops *ops;
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@ -37,9 +37,6 @@ MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
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MODULE_LICENSE("GPL");
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#define FREQ_LO ((tea->tea5759 ? 760 : 875) * 1600U)
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#define FREQ_HI ((tea->tea5759 ? 910 : 1080) * 1600U)
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/*
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* definitions
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*/
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@ -50,8 +47,8 @@ MODULE_LICENSE("GPL");
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#define TEA575X_BIT_BAND_MASK (3<<20)
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#define TEA575X_BIT_BAND_FM (0<<20)
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#define TEA575X_BIT_BAND_MW (1<<20)
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#define TEA575X_BIT_BAND_LW (1<<21)
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#define TEA575X_BIT_BAND_SW (1<<22)
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#define TEA575X_BIT_BAND_LW (2<<20)
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#define TEA575X_BIT_BAND_SW (3<<20)
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#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
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#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
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#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
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@ -62,6 +59,37 @@ MODULE_LICENSE("GPL");
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#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
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#define TEA575X_BIT_FREQ_MASK 0x7fff
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enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };
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static const struct v4l2_frequency_band bands[] = {
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{
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.type = V4L2_TUNER_RADIO,
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.index = 0,
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
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V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 87500 * 16,
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.rangehigh = 108000 * 16,
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.modulation = V4L2_BAND_MODULATION_FM,
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},
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{
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.type = V4L2_TUNER_RADIO,
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.index = 0,
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
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V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 76000 * 16,
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.rangehigh = 91000 * 16,
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.modulation = V4L2_BAND_MODULATION_FM,
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},
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{
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.type = V4L2_TUNER_RADIO,
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.index = 1,
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 530 * 16,
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.rangehigh = 1710 * 16,
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.modulation = V4L2_BAND_MODULATION_AM,
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},
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};
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/*
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* lowlevel part
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*/
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@ -133,16 +161,29 @@ static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
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if (freq == 0)
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return freq;
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switch (tea->band) {
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case BAND_FM:
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/* freq *= 12.5 */
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freq *= 125;
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freq /= 10;
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/* crystal fixup */
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if (tea->tea5759)
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freq += TEA575X_FMIF;
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else
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freq -= TEA575X_FMIF;
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break;
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case BAND_FM_JAPAN:
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/* freq *= 12.5 */
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freq *= 125;
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freq /= 10;
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/* crystal fixup */
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freq += TEA575X_FMIF;
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break;
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case BAND_AM:
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/* crystal fixup */
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freq -= TEA575X_AMIF;
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break;
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}
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return clamp(freq * 16, FREQ_LO, FREQ_HI); /* from kHz */
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return clamp(freq * 16, bands[tea->band].rangelow,
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bands[tea->band].rangehigh); /* from kHz */
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}
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static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
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@ -152,19 +193,35 @@ static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
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static void snd_tea575x_set_freq(struct snd_tea575x *tea)
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{
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u32 freq = tea->freq;
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u32 freq = tea->freq / 16; /* to kHz */
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u32 band = 0;
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freq /= 16; /* to kHz */
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switch (tea->band) {
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case BAND_FM:
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band = TEA575X_BIT_BAND_FM;
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/* crystal fixup */
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if (tea->tea5759)
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freq -= TEA575X_FMIF;
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else
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freq += TEA575X_FMIF;
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/* freq /= 12.5 */
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freq *= 10;
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freq /= 125;
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break;
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case BAND_FM_JAPAN:
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band = TEA575X_BIT_BAND_FM;
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/* crystal fixup */
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freq -= TEA575X_FMIF;
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/* freq /= 12.5 */
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freq *= 10;
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freq /= 125;
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break;
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case BAND_AM:
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band = TEA575X_BIT_BAND_MW;
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/* crystal fixup */
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freq += TEA575X_AMIF;
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break;
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}
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tea->val &= ~TEA575X_BIT_FREQ_MASK;
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tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
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tea->val |= band;
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tea->val |= freq & TEA575X_BIT_FREQ_MASK;
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snd_tea575x_write(tea, tea->val);
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tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
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@ -190,23 +247,57 @@ static int vidioc_querycap(struct file *file, void *priv,
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return 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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struct snd_tea575x *tea = video_drvdata(file);
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int index;
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if (band->tuner != 0)
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return -EINVAL;
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switch (band->index) {
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case 0:
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if (tea->tea5759)
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index = BAND_FM_JAPAN;
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else
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index = BAND_FM;
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break;
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case 1:
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if (tea->has_am) {
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index = BAND_AM;
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break;
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}
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/* Fall through */
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default:
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return -EINVAL;
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}
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*band = bands[index];
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if (!tea->cannot_read_data)
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band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
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return 0;
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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 snd_tea575x *tea = video_drvdata(file);
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struct v4l2_frequency_band band_fm = { 0, };
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if (v->index > 0)
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return -EINVAL;
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snd_tea575x_read(tea);
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vidioc_enum_freq_bands(file, priv, &band_fm);
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strcpy(v->name, "FM");
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memset(v, 0, sizeof(*v));
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strlcpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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if (!tea->cannot_read_data)
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v->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
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v->rangelow = FREQ_LO;
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v->rangehigh = FREQ_HI;
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v->capability = band_fm.capability;
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v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
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v->rangehigh = band_fm.rangehigh;
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v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
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v->audmode = (tea->val & TEA575X_BIT_MONO) ?
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V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
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@ -218,13 +309,17 @@ 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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struct snd_tea575x *tea = video_drvdata(file);
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u32 orig_val = tea->val;
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if (v->index)
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return -EINVAL;
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tea->val &= ~TEA575X_BIT_MONO;
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if (v->audmode == V4L2_TUNER_MODE_MONO)
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tea->val |= TEA575X_BIT_MONO;
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snd_tea575x_write(tea, tea->val);
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/* Only apply changes if currently tuning FM */
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if (tea->band != BAND_AM && tea->val != orig_val)
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snd_tea575x_set_freq(tea);
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return 0;
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}
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@ -248,8 +343,15 @@ static int vidioc_s_frequency(struct file *file, void *priv,
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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tea->val &= ~TEA575X_BIT_SEARCH;
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tea->freq = clamp(f->frequency, FREQ_LO, FREQ_HI);
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if (tea->has_am && f->frequency < (20000 * 16))
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tea->band = BAND_AM;
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else if (tea->tea5759)
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tea->band = BAND_FM_JAPAN;
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else
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tea->band = BAND_FM;
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tea->freq = clamp(f->frequency, bands[tea->band].rangelow,
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bands[tea->band].rangehigh);
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snd_tea575x_set_freq(tea);
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return 0;
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}
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@ -259,13 +361,35 @@ static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
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{
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struct snd_tea575x *tea = video_drvdata(file);
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unsigned long timeout;
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int i;
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int i, spacing;
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if (tea->cannot_read_data)
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return -ENOTTY;
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if (a->tuner || a->wrap_around)
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return -EINVAL;
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if (a->rangelow || a->rangehigh) {
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for (i = 0; i < ARRAY_SIZE(bands); i++) {
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if ((i == BAND_FM && tea->tea5759) ||
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(i == BAND_FM_JAPAN && !tea->tea5759) ||
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(i == BAND_AM && !tea->has_am))
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continue;
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if (bands[i].rangelow == a->rangelow &&
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bands[i].rangehigh == a->rangehigh)
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break;
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}
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if (i == ARRAY_SIZE(bands))
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return -EINVAL; /* No matching band found */
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if (i != tea->band) {
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tea->band = i;
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tea->freq = clamp(tea->freq, bands[i].rangelow,
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bands[i].rangehigh);
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snd_tea575x_set_freq(tea);
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}
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}
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spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */
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/* clear the frequency, HW will fill it in */
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tea->val &= ~TEA575X_BIT_FREQ_MASK;
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tea->val |= TEA575X_BIT_SEARCH;
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@ -297,10 +421,10 @@ static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
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if (freq == 0) /* shouldn't happen */
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break;
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/*
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* if we moved by less than 50 kHz, or in the wrong
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* direction, continue seeking
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* if we moved by less than the spacing, or in the
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* wrong direction, continue seeking
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*/
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if (abs(tea->freq - freq) < 16 * 50 ||
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if (abs(tea->freq - freq) < 16 * spacing ||
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(a->seek_upward && freq < tea->freq) ||
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(!a->seek_upward && freq > tea->freq)) {
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snd_tea575x_write(tea, tea->val);
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@ -344,6 +468,7 @@ static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
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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_s_hw_freq_seek = vidioc_s_hw_freq_seek,
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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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