Re: [PATCH v4 29/32] sound: soc: qcom: q6usb: Add headphone jack for offload connection status

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

On 7/25/23 04:34, Wesley Cheng wrote:
> The headphone jack framework has a well defined intrastructure for

infrastructure

> notifying userspace entities through input devices.  Expose a jack device
> that carries information about if an offload capable device is connected.
> Applications can further identify specific offloading information through
> other SND kcontrols.

What if you connect a set of USB speakers? Would they show as a
headphone/headset?

> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
> ---
>  sound/soc/qcom/qdsp6/q6usb.c | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
> index e4ccb9d912b0..860dff8c1438 100644
> --- a/sound/soc/qcom/qdsp6/q6usb.c
> +++ b/sound/soc/qcom/qdsp6/q6usb.c
> @@ -20,6 +20,7 @@
>  #include <sound/pcm_params.h>
>  #include <sound/asound.h>
>  #include <sound/q6usboffload.h>
> +#include <sound/jack.h>
>  
>  #include "q6dsp-lpass-ports.h"
>  #include "q6afe.h"
> @@ -37,6 +38,7 @@ struct q6usb_status {
>  struct q6usb_port_data {
>  	struct q6afe_usb_cfg usb_cfg;
>  	struct snd_soc_usb *usb;
> +	struct snd_soc_jack hs_jack;
>  	struct q6usb_offload priv;
>  	struct mutex mutex;
>  	unsigned long available_card_slot;
> @@ -279,6 +281,7 @@ static const struct snd_kcontrol_new q6usb_offload_control = {
>  /* Build a mixer control for a UAC connector control (jack-detect) */
>  static void q6usb_connector_control_init(struct snd_soc_component *component)
>  {
> +	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
>  	int ret;
>  
>  	ret = snd_ctl_add(component->card->snd_card,
> @@ -290,6 +293,11 @@ static void q6usb_connector_control_init(struct snd_soc_component *component)
>  				snd_ctl_new1(&q6usb_offload_dev_ctrl, component));
>  	if (ret < 0)
>  		return;
> +
> +	ret = snd_soc_card_jack_new(component->card, "USB offload",
> +					SND_JACK_HEADSET, &data->hs_jack);

not all USB devices are headsets...

> +	if (ret)
> +		return;
>  }
>  
>  static int q6usb_audio_ports_of_xlate_dai_name(struct snd_soc_component *component,
> @@ -322,7 +330,10 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb, int card_idx,
>  
>  	mutex_lock(&data->mutex);
>  	if (connected) {
> -		snd_soc_dapm_enable_pin(dapm, "USB_RX_BE");
> +		if (!data->available_card_slot) {
> +			snd_soc_dapm_enable_pin(dapm, "USB_RX_BE");
> +			snd_jack_report(data->hs_jack.jack, 1);
> +		}
>  		/*
>  		 * Update the latest USB headset plugged in, if session is
>  		 * idle.
> @@ -338,8 +349,10 @@ static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb, int card_idx,
>  		clear_bit(card_idx, &data->available_card_slot);
>  		data->status[card_idx].num_pcm = 0;
>  		data->status[card_idx].chip_index = 0;
> -		if (!data->available_card_slot)
> +		if (!data->available_card_slot) {
>  			snd_soc_dapm_disable_pin(dapm, "USB_RX_BE");
> +			snd_jack_report(data->hs_jack.jack, 0);
> +		}
>  	}
>  	snd_soc_dapm_sync(dapm);
>  	mutex_unlock(&data->mutex);