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-rw-r--r--sound/usb/qcom/Makefile2
-rw-r--r--sound/usb/qcom/mixer_usb_offload.c155
-rw-r--r--sound/usb/qcom/mixer_usb_offload.h11
-rw-r--r--sound/usb/qcom/qc_audio_offload.c2
4 files changed, 170 insertions, 0 deletions
diff --git a/sound/usb/qcom/Makefile b/sound/usb/qcom/Makefile
index 1eb51160e2e5..6567727b66f0 100644
--- a/sound/usb/qcom/Makefile
+++ b/sound/usb/qcom/Makefile
@@ -1,2 +1,4 @@
snd-usb-audio-qmi-y := usb_audio_qmi_v01.o qc_audio_offload.o
+snd-usb-audio-qmi-y += mixer_usb_offload.o
obj-$(CONFIG_SND_USB_AUDIO_QMI) += snd-usb-audio-qmi.o
+
diff --git a/sound/usb/qcom/mixer_usb_offload.c b/sound/usb/qcom/mixer_usb_offload.c
new file mode 100644
index 000000000000..2adeb64f4d33
--- /dev/null
+++ b/sound/usb/qcom/mixer_usb_offload.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022-2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/usb.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/soc-usb.h>
+
+#include "../usbaudio.h"
+#include "../card.h"
+#include "../helper.h"
+#include "../mixer.h"
+
+#include "mixer_usb_offload.h"
+
+#define PCM_IDX(n) ((n) & 0xffff)
+#define CARD_IDX(n) ((n) >> 16)
+
+static int
+snd_usb_offload_card_route_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct device *sysdev = snd_kcontrol_chip(kcontrol);
+ int ret;
+
+ ret = snd_soc_usb_update_offload_route(sysdev,
+ CARD_IDX(kcontrol->private_value),
+ PCM_IDX(kcontrol->private_value),
+ SNDRV_PCM_STREAM_PLAYBACK,
+ SND_SOC_USB_KCTL_CARD_ROUTE,
+ ucontrol->value.integer.value);
+ if (ret < 0) {
+ ucontrol->value.integer.value[0] = -1;
+ ucontrol->value.integer.value[1] = -1;
+ }
+
+ return 0;
+}
+
+static int snd_usb_offload_card_route_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 1;
+ uinfo->value.integer.min = -1;
+ uinfo->value.integer.max = SNDRV_CARDS;
+
+ return 0;
+}
+
+static struct snd_kcontrol_new snd_usb_offload_mapped_card_ctl = {
+ .iface = SNDRV_CTL_ELEM_IFACE_CARD,
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ .info = snd_usb_offload_card_route_info,
+ .get = snd_usb_offload_card_route_get,
+};
+
+static int
+snd_usb_offload_pcm_route_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct device *sysdev = snd_kcontrol_chip(kcontrol);
+ int ret;
+
+ ret = snd_soc_usb_update_offload_route(sysdev,
+ CARD_IDX(kcontrol->private_value),
+ PCM_IDX(kcontrol->private_value),
+ SNDRV_PCM_STREAM_PLAYBACK,
+ SND_SOC_USB_KCTL_PCM_ROUTE,
+ ucontrol->value.integer.value);
+ if (ret < 0) {
+ ucontrol->value.integer.value[0] = -1;
+ ucontrol->value.integer.value[1] = -1;
+ }
+
+ return 0;
+}
+
+static int snd_usb_offload_pcm_route_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 1;
+ uinfo->value.integer.min = -1;
+ /* Arbitrary max value, as there is no 'limit' on number of PCM devices */
+ uinfo->value.integer.max = 0xff;
+
+ return 0;
+}
+
+static struct snd_kcontrol_new snd_usb_offload_mapped_pcm_ctl = {
+ .iface = SNDRV_CTL_ELEM_IFACE_CARD,
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ .info = snd_usb_offload_pcm_route_info,
+ .get = snd_usb_offload_pcm_route_get,
+};
+
+/**
+ * snd_usb_offload_create_ctl() - Add USB offload bounded mixer
+ * @chip: USB SND chip device
+ * @bedev: Reference to USB backend DAI device
+ *
+ * Creates a sound control for a USB audio device, so that applications can
+ * query for if there is an available USB audio offload path, and which
+ * card is managing it.
+ */
+int snd_usb_offload_create_ctl(struct snd_usb_audio *chip, struct device *bedev)
+{
+ struct snd_kcontrol_new *chip_kctl;
+ struct snd_usb_substream *subs;
+ struct snd_usb_stream *as;
+ char ctl_name[48];
+ int ret;
+
+ list_for_each_entry(as, &chip->pcm_list, list) {
+ subs = &as->substream[SNDRV_PCM_STREAM_PLAYBACK];
+ if (!subs->ep_num || as->pcm_index > 0xff)
+ continue;
+
+ chip_kctl = &snd_usb_offload_mapped_card_ctl;
+ chip_kctl->count = 1;
+ /*
+ * Store the associated USB SND card number and PCM index for
+ * the kctl.
+ */
+ chip_kctl->private_value = as->pcm_index |
+ chip->card->number << 16;
+ sprintf(ctl_name, "USB Offload Playback Card Route PCM#%d",
+ as->pcm_index);
+ chip_kctl->name = ctl_name;
+ ret = snd_ctl_add(chip->card, snd_ctl_new1(chip_kctl, bedev));
+ if (ret < 0)
+ break;
+
+ chip_kctl = &snd_usb_offload_mapped_pcm_ctl;
+ chip_kctl->count = 1;
+ /*
+ * Store the associated USB SND card number and PCM index for
+ * the kctl.
+ */
+ chip_kctl->private_value = as->pcm_index |
+ chip->card->number << 16;
+ sprintf(ctl_name, "USB Offload Playback PCM Route PCM#%d",
+ as->pcm_index);
+ chip_kctl->name = ctl_name;
+ ret = snd_ctl_add(chip->card, snd_ctl_new1(chip_kctl, bedev));
+ if (ret < 0)
+ break;
+ }
+
+ return ret;
+}
diff --git a/sound/usb/qcom/mixer_usb_offload.h b/sound/usb/qcom/mixer_usb_offload.h
new file mode 100644
index 000000000000..cf20673f4dc9
--- /dev/null
+++ b/sound/usb/qcom/mixer_usb_offload.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2022-2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __USB_OFFLOAD_MIXER_H
+#define __USB_OFFLOAD_MIXER_H
+
+int snd_usb_offload_create_ctl(struct snd_usb_audio *chip, struct device *bedev);
+
+#endif /* __USB_OFFLOAD_MIXER_H */
diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_offload.c
index 464c5106b420..378249a264a3 100644
--- a/sound/usb/qcom/qc_audio_offload.c
+++ b/sound/usb/qcom/qc_audio_offload.c
@@ -38,6 +38,7 @@
#include "../pcm.h"
#include "../power.h"
+#include "mixer_usb_offload.h"
#include "usb_audio_qmi_v01.h"
/* Stream disable request timeout during USB device disconnect */
@@ -1792,6 +1793,7 @@ static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
sdev->card_idx = chip->card->number;
sdev->chip_idx = chip->index;
+ snd_usb_offload_create_ctl(chip, uaudio_qdev->auxdev->dev.parent);
snd_soc_usb_connect(uaudio_qdev->auxdev->dev.parent, sdev);
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-15 14:25:16 +0000