@@ -6,6 +6,8 @@
#ifndef __LINUX_SND_SOC_USB_H
#define __LINUX_SND_SOC_USB_H
+#include <sound/soc.h>
+
enum snd_soc_usb_dai_state {
SND_SOC_USB_IDLE,
SND_SOC_USB_PREPARED,
@@ -76,6 +78,8 @@ int snd_soc_usb_prepare_session(struct snd_soc_usb *usb, int card_idx, int pcm_i
int snd_soc_usb_shutdown_session(struct snd_soc_usb *usb, int session_id);
int snd_soc_usb_set_session_state(struct snd_soc_usb *usb, int session_id,
enum snd_soc_usb_dai_state state);
+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,
int num_supported_streams, void *data);
@@ -4,8 +4,11 @@
*/
#include <linux/of.h>
#include <linux/usb.h>
+
+#include <sound/jack.h>
#include <sound/soc.h>
#include <sound/soc-usb.h>
+
#include "../usb/card.h"
static DEFINE_MUTEX(ctx_mutex);
@@ -42,6 +45,40 @@ static struct snd_soc_usb *snd_soc_find_usb_ctx(struct device_node *node)
}
/* 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, "SNDUSB OFFLD Jack",
+ SND_JACK_HEADPHONE, jack);
+ if (ret < 0) {
+ dev_err(component->card->dev, "Unable to add USB offload jack\n");
+ return ret;
+ }
+
+ ret = snd_soc_component_set_jack(component, jack, NULL);
+ if (ret) {
+ dev_warn(component->card->dev, "Failed to set jack: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_usb_setup_offload_jack);
+
static int snd_soc_usb_get_offload_status(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
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. Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> --- include/sound/soc-usb.h | 4 ++++ sound/soc/soc-usb.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+)