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ASoC: usb: Create SOC USB SND jack kcontrol

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Expose API for creation of a jack control for notifying of available
devices that are plugged in/discovered, and that support offloading.  This
allows for control names to be standardized across implementations of USB
audio offloading.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-17-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wesley Cheng 2025-04-09 12:47:49 -07:00 • committed by Greg Kroah-Hartman
parent 00f5d6bfba
commit 0bb5f3614b
2 changed files with 47 additions and 0 deletions
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9
include/sound/soc-usb.h
View file

@ -56,6 +56,9 @@ int snd_soc_usb_connect(struct device *usbdev, struct snd_soc_usb_device *sdev);
int snd_soc_usb_disconnect(struct device *usbdev, struct snd_soc_usb_device *sdev);
void *snd_soc_usb_find_priv_data(struct device *usbdev);
int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
struct snd_soc_jack *jack);
struct snd_soc_usb *snd_soc_usb_allocate_port(struct snd_soc_component *component,
void *data);
void snd_soc_usb_free_port(struct snd_soc_usb *usb);
@ -86,6 +89,12 @@ static inline void *snd_soc_usb_find_priv_data(struct device *usbdev)
return NULL;
}
static inline int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
struct snd_soc_jack *jack)
{
return 0;
}
static inline struct snd_soc_usb *
snd_soc_usb_allocate_port(struct snd_soc_component *component, void *data)
{

38
sound/soc/soc-usb.c
View file

@ -4,7 +4,10 @@
*/
#include <linux/of.h>
#include <linux/usb.h>
#include <sound/jack.h>
#include <sound/soc-usb.h>
#include "../usb/card.h"
static DEFINE_MUTEX(ctx_mutex);
@ -52,6 +55,41 @@ static struct snd_soc_usb *snd_soc_find_usb_ctx(struct device *dev)
return ctx ? ctx : NULL;
}
/* SOC USB sound kcontrols */
/**
* snd_soc_usb_setup_offload_jack() - Create USB offloading jack
* @component: USB DPCM backend DAI component
* @jack: jack structure to create
*
* Creates a jack device for notifying userspace of the availability
* of an offload capable device.
*
* Returns 0 on success, negative on error.
*
*/
int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
struct snd_soc_jack *jack)
{
int ret;
ret = snd_soc_card_jack_new(component->card, "USB Offload Jack",
SND_JACK_USB, jack);
if (ret < 0) {
dev_err(component->card->dev, "Unable to add USB offload jack: %d\n",
ret);
return ret;
}
ret = snd_soc_component_set_jack(component, jack, NULL);
if (ret) {
dev_err(component->card->dev, "Failed to set jack: %d\n", ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_usb_setup_offload_jack);
/**
* snd_soc_usb_find_priv_data() - Retrieve private data stored
* @usbdev: device reference