[alsa-devel] [PATCH v2 1/3] ALSA: Added jack detection kcontrol support

[Takashi Iwai]

At Fri, 26 Jul 2013 15:45:11 -0700,
Felipe F. Tonello wrote:
> 
> From: "Felipe F. Tonello" <eu at felipetonello.com>
> 
> This patch adds jack support for alsa kcontrol.
> 
> This support is necessary since the new kcontrol is used by user-space
> daemons, such as PulseAudio(>=2.0), to do jack detection.)
> 
> Signed-off-by: Felipe F. Tonello <eu at felipetonello.com>

This patch breaks the build.


Takashi

> ---
>  include/sound/jack.h |  6 ++++--
>  sound/core/Kconfig   |  1 +
>  sound/core/ctljack.c |  3 ++-
>  sound/core/jack.c    | 29 +++++++++++++++++++++++++++--
>  4 files changed, 34 insertions(+), 5 deletions(-)
> 
> diff --git a/include/sound/jack.h b/include/sound/jack.h
> index 5891657..dc62b74 100644
> --- a/include/sound/jack.h
> +++ b/include/sound/jack.h
> @@ -26,6 +26,7 @@
>  #include <sound/core.h>
>  
>  struct input_dev;
> +struct snd_kcontrol;
>  
>  /**
>   * Jack types which can be reported.  These values are used as a
> @@ -58,6 +59,7 @@ enum snd_jack_types {
>  
>  struct snd_jack {
>  	struct input_dev *input_dev;
> +	struct snd_kcontrol *kctl;
>  	int registered;
>  	int type;
>  	const char *id;
> @@ -70,7 +72,7 @@ struct snd_jack {
>  #ifdef CONFIG_SND_JACK
>  
>  int snd_jack_new(struct snd_card *card, const char *id, int type,
> -		 struct snd_jack **jack);
> +                 int idx, struct snd_jack **jack);
>  void snd_jack_set_parent(struct snd_jack *jack, struct device *parent);
>  int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
>  		     int keytype);
> @@ -80,7 +82,7 @@ void snd_jack_report(struct snd_jack *jack, int status);
>  #else
>  
>  static inline int snd_jack_new(struct snd_card *card, const char *id, int type,
> -			       struct snd_jack **jack)
> +                               int idx, struct snd_jack **jack)
>  {
>  	return 0;
>  }
> diff --git a/sound/core/Kconfig b/sound/core/Kconfig
> index c0c2f57..8167615 100644
> --- a/sound/core/Kconfig
> +++ b/sound/core/Kconfig
> @@ -20,6 +20,7 @@ config SND_COMPRESS_OFFLOAD
>  # to avoid having to force INPUT on.
>  config SND_JACK
>  	bool
> +	select SND_KCTL_JACK
>  
>  config SND_SEQUENCER
>  	tristate "Sequencer support"
> diff --git a/sound/core/ctljack.c b/sound/core/ctljack.c
> index e4b38fb..59aa6d0 100644
> --- a/sound/core/ctljack.c
> +++ b/sound/core/ctljack.c
> @@ -38,7 +38,8 @@ snd_kctl_jack_new(const char *name, int idx, void *private_data)
>  	kctl = snd_ctl_new1(&jack_detect_kctl, private_data);
>  	if (!kctl)
>  		return NULL;
> -	snprintf(kctl->id.name, sizeof(kctl->id.name), "%s Jack", name);
> +
> +	strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
>  	kctl->id.index = idx;
>  	kctl->private_value = 0;
>  	return kctl;
> diff --git a/sound/core/jack.c b/sound/core/jack.c
> index b35fe73..b2757b1 100644
> --- a/sound/core/jack.c
> +++ b/sound/core/jack.c
> @@ -24,6 +24,7 @@
>  #include <linux/module.h>
>  #include <sound/jack.h>
>  #include <sound/core.h>
> +#include <sound/control.h>
>  
>  static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
>  	SW_HEADPHONE_INSERT,
> @@ -48,6 +49,7 @@ static int snd_jack_dev_free(struct snd_device *device)
>  	else
>  		input_free_device(jack->input_dev);
>  
> +	snd_ctl_remove(device->card, jack->kctl);
>  	kfree(jack->id);
>  	kfree(jack);
>  
> @@ -85,26 +87,36 @@ static int snd_jack_dev_register(struct snd_device *device)
>  	if (err == 0)
>  		jack->registered = 1;
>  
> +	/* We don't need to free the control, it's freed by snd_ctl_add itself
> +	   if an error occur */
> +	err = snd_ctl_add(card, jack->kctl);
> +
>  	return err;
>  }
>  
>  /**
>   * snd_jack_new - Create a new jack
>   * @card:  the card instance
> - * @id:    an identifying string for this jack
> + * @id:    an identifying string for this jack, " Jack" is appended to the
> + *         string
>   * @type:  a bitmask of enum snd_jack_type values that can be detected by
>   *         this jack
> + * @idx:   index of this control item
>   * @jjack: Used to provide the allocated jack object to the caller.
>   *
>   * Creates a new jack object.
>   *
> + * This function creates a Jack Kcontrol, which is exported to user space via
> + * ALSA Controls.
> + *
>   * Return: Zero if successful, or a negative error code on failure.
>   * On success @jjack will be initialised.
>   */
>  int snd_jack_new(struct snd_card *card, const char *id, int type,
> -		 struct snd_jack **jjack)
> +                 int idx, struct snd_jack **jjack)
>  {
>  	struct snd_jack *jack;
> +	struct snd_kcontrol *kctl;
>  	int err;
>  	int i;
>  	static struct snd_device_ops ops = {
> @@ -117,6 +129,7 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
>  		return -ENOMEM;
>  
>  	jack->id = kstrdup(id, GFP_KERNEL);
> +	sprintf((char *)jack->id, "%s Jack", jack->id);
>  
>  	jack->input_dev = input_allocate_device();
>  	if (jack->input_dev == NULL) {
> @@ -137,6 +150,15 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
>  	if (err < 0)
>  		goto fail_input;
>  
> +	/* card is the private_data */
> +	kctl = snd_kctl_jack_new(jack->id, idx, card);
> +	if (!kctl) {
> +		err = -ENOMEM;
> +		goto fail_input;
> +	}
> +
> +	jack->kctl = kctl;
> +
>  	*jjack = jack;
>  
>  	return 0;
> @@ -239,6 +261,9 @@ void snd_jack_report(struct snd_jack *jack, int status)
>  	}
>  
>  	input_sync(jack->input_dev);
> +
> +	/* Update ALSA KControl interface */
> +	snd_kctl_jack_report((struct snd_card *)jack->kctl->private_data, jack->kctl, !!status);
>  }
>  EXPORT_SYMBOL(snd_jack_report);
>  
> -- 
> 1.8.1.4
>