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SubjectRe: [RFC PATCH 1/3] tea575x-tuner: various improvements
Date
On Saturday, March 19, 2011 16:32:53 Ondrej Zary wrote:
> Improve tea575x-tuner with various good things from radio-maestro:
> - extend frequency range to 50-150MHz
> - fix querycap(): card name, CAP_RADIO
> - improve g_tuner(): CAP_STEREO, stereo and tuned indication
> - improve g_frequency(): tuner index checking and reading frequency from HW
> - improve s_frequency(): tuner index and type checking
>
> Signed-off-by: Ondrej Zary <linux@rainbow-software.org>

Acked-by: Hans Verkuil <hverkuil@xs4all.nl>

BTW, can you run the v4l2-compliance utility for the two boards that use
this radio tuner?

This utility is part of the v4l-utils repository (http://git.linuxtv.org/v4l-utils.git).

Run as 'v4l2-compliance -r /dev/radioX -v2'.

I'm sure there will be some errors/warnings (warnings regarding G/S_PRIORITY
are to be expected). But I can use it to make a patch for 2.6.40 that fixes
any issues.

Regards,

Hans

>
> --- linux-2.6.38-rc4-orig/sound/i2c/other/tea575x-tuner.c 2011-02-08 01:03:55.000000000 +0100
> +++ linux-2.6.38-rc4/sound/i2c/other/tea575x-tuner.c 2011-03-19 15:40:14.000000000 +0100
> @@ -37,8 +37,8 @@ static int radio_nr = -1;
> module_param(radio_nr, int, 0);
>
> #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
> -#define FREQ_LO (87 * 16000)
> -#define FREQ_HI (108 * 16000)
> +#define FREQ_LO (50UL * 16000)
> +#define FREQ_HI (150UL * 16000)
>
> /*
> * definitions
> @@ -77,15 +77,29 @@ static struct v4l2_queryctrl radio_qctrl
> * lowlevel part
> */
>
> +static void snd_tea575x_get_freq(struct snd_tea575x *tea)
> +{
> + unsigned long freq;
> +
> + freq = tea->ops->read(tea) & TEA575X_BIT_FREQ_MASK;
> + /* freq *= 12.5 */
> + freq *= 125;
> + freq /= 10;
> + /* crystal fixup */
> + if (tea->tea5759)
> + freq += tea->freq_fixup;
> + else
> + freq -= tea->freq_fixup;
> +
> + tea->freq = freq * 16; /* from kHz */
> +}
> +
> static void snd_tea575x_set_freq(struct snd_tea575x *tea)
> {
> unsigned long freq;
>
> - freq = tea->freq / 16; /* to kHz */
> - if (freq > 108000)
> - freq = 108000;
> - if (freq < 87000)
> - freq = 87000;
> + freq = clamp(tea->freq, FREQ_LO, FREQ_HI);
> + freq /= 16; /* to kHz */
> /* crystal fixup */
> if (tea->tea5759)
> freq -= tea->freq_fixup;
> @@ -109,29 +123,33 @@ static int vidioc_querycap(struct file *
> {
> struct snd_tea575x *tea = video_drvdata(file);
>
> - strcpy(v->card, tea->tea5759 ? "TEA5759" : "TEA5757");
> strlcpy(v->driver, "tea575x-tuner", sizeof(v->driver));
> - strlcpy(v->card, "Maestro Radio", sizeof(v->card));
> + strlcpy(v->card, tea->tea5759 ? "TEA5759" : "TEA5757", sizeof(v->card));
> sprintf(v->bus_info, "PCI");
> v->version = RADIO_VERSION;
> - v->capabilities = V4L2_CAP_TUNER;
> + v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
> return 0;
> }
>
> static int vidioc_g_tuner(struct file *file, void *priv,
> struct v4l2_tuner *v)
> {
> + struct snd_tea575x *tea = video_drvdata(file);
> +
> if (v->index > 0)
> return -EINVAL;
>
> + tea->ops->read(tea);
> +
> strcpy(v->name, "FM");
> v->type = V4L2_TUNER_RADIO;
> + v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
> v->rangelow = FREQ_LO;
> v->rangehigh = FREQ_HI;
> - v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
> - v->capability = V4L2_TUNER_CAP_LOW;
> - v->audmode = V4L2_TUNER_MODE_MONO;
> - v->signal = 0xffff;
> + v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
> + v->audmode = tea->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
> + v->signal = tea->tuned ? 0xffff : 0;
> +
> return 0;
> }
>
> @@ -148,7 +166,10 @@ static int vidioc_g_frequency(struct fil
> {
> struct snd_tea575x *tea = video_drvdata(file);
>
> + if (f->tuner != 0)
> + return -EINVAL;
> f->type = V4L2_TUNER_RADIO;
> + snd_tea575x_get_freq(tea);
> f->frequency = tea->freq;
> return 0;
> }
> @@ -158,6 +179,9 @@ static int vidioc_s_frequency(struct fil
> {
> struct snd_tea575x *tea = video_drvdata(file);
>
> + if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
> + return -EINVAL;
> +
> if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
> return -EINVAL;
>
> --- linux-2.6.38-rc4-orig/include/sound/tea575x-tuner.h 2011-02-08 01:03:55.000000000 +0100
> +++ linux-2.6.38-rc4/include/sound/tea575x-tuner.h 2011-03-19 14:18:06.000000000 +0100
> @@ -38,8 +38,10 @@ struct snd_tea575x {
> struct snd_card *card;
> struct video_device *vd; /* video device */
> int dev_nr; /* requested device number + 1 */
> - int tea5759; /* 5759 chip is present */
> - int mute; /* Device is muted? */
> + bool tea5759; /* 5759 chip is present */
> + bool mute; /* Device is muted? */
> + bool stereo; /* receiving stereo */
> + bool tuned; /* tuned to a station */
> unsigned int freq_fixup; /* crystal onboard */
> unsigned int val; /* hw value */
> unsigned long freq; /* frequency */
>
>
>


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