[alsa-devel] [RFC PATCH 1/3] tea575x-tuner: various improvements

[Hans Verkuil]

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 at rainbow-software.org>

Acked-by: Hans Verkuil <hverkuil at 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 */
> 
> 
>