@@ -176,10 +176,20 @@ config SND_BCD2000
To compile this driver as a module, choose M here: the module
will be called snd-bcd2000.
+config SND_USB_OFFLOAD_MIXER
+ tristate "USB Audio Offload mixer control"
+ help
+ Say Y to enable the USB audio offloading mixer controls. This
+ exposes an USB offload capable kcontrol to signal to applications
+ about which platform sound card can support USB audio offload.
+ The returning values specify the mapped ASoC card and PCM device
+ the USB audio device is associated to.
+
config SND_USB_AUDIO_QMI
tristate "Qualcomm Audio Offload driver"
depends on QCOM_QMI_HELPERS && SND_USB_AUDIO && USB_XHCI_SIDEBAND && SND_SOC_USB
select SND_PCM
+ select SND_USB_OFFLOAD_MIXER
help
Say Y here to enable the Qualcomm USB audio offloading feature.
@@ -36,3 +36,5 @@ obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o
obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ qcom/
obj-$(CONFIG_SND_USB_LINE6) += line6/
+
+obj-$(CONFIG_SND_USB_OFFLOAD_MIXER) += mixer_usb_offload.o
new file mode 100644
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022-2024 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_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,
+ 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_route_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 2;
+ 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_ctl = {
+ .iface = SNDRV_CTL_ELEM_IFACE_CARD,
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ .info = snd_usb_offload_route_info,
+ .get = snd_usb_offload_route_get,
+};
+
+/**
+ * snd_usb_offload_create_ctl() - Add USB offload bounded mixer
+ * @chip - USB SND chip 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 usb_device *udev = chip->dev;
+ struct snd_kcontrol_new *chip_kctl;
+ struct snd_usb_substream *subs;
+ struct snd_usb_stream *as;
+ char ctl_name[37];
+ int ret;
+
+ list_for_each_entry(as, &chip->pcm_list, list) {
+ subs = &as->substream[SNDRV_PCM_STREAM_PLAYBACK];
+ if (!subs->ep_num)
+ continue;
+
+ chip_kctl = &snd_usb_offload_mapped_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 Route PCM#%d",
+ as->pcm_index);
+ chip_kctl->name = ctl_name;
+ ret = snd_ctl_add(chip->card, snd_ctl_new1(chip_kctl,
+ udev->bus->sysdev));
+ if (ret < 0)
+ break;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_usb_offload_create_ctl);
new file mode 100644
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __USB_OFFLOAD_MIXER_H
+#define __USB_OFFLOAD_MIXER_H
+
+#if IS_ENABLED(CONFIG_SND_USB_OFFLOAD_MIXER)
+int snd_usb_offload_create_ctl(struct snd_usb_audio *chip);
+#else
+static inline int snd_usb_offload_create_ctl(struct snd_usb_audio *chip)
+{
+ return 0;
+}
+#endif
+#endif /* __USB_OFFLOAD_MIXER_H */
@@ -1,2 +1,2 @@
snd-usb-audio-qmi-objs := usb_audio_qmi_v01.o qc_audio_offload.o
-obj-$(CONFIG_SND_USB_AUDIO_QMI) += snd-usb-audio-qmi.o
\ No newline at end of file
+obj-$(CONFIG_SND_USB_AUDIO_QMI) += snd-usb-audio-qmi.o
@@ -36,6 +36,7 @@
#include "../helper.h"
#include "../pcm.h"
#include "../power.h"
+#include "../mixer_usb_offload.h"
#include "usb_audio_qmi_v01.h"
@@ -1703,6 +1704,7 @@ 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);
snd_soc_usb_connect(usb_get_usb_backend(udev), sdev);
}
In order to allow userspace/applications know about USB offloading status, expose a sound kcontrol that fetches information about which sound card and PCM index the USB device is mapped to for supporting offloading. In the USB audio offloading framework, the ASoC BE DAI link is the entity responsible for registering to the SOC USB layer. It is expected for the USB SND offloading driver to add the kcontrol to the sound card associated with the USB audio device. An example output would look like: tinymix -D 1 get 'USB Offload Playback Route PCM#0' -1, -1 (range -1->255) This example signifies that there is no mapped ASoC path available for the USB SND device. tinymix -D 1 get 'USB Offload Playback Route PCM#0' 0, 0 (range -1->255) This example signifies that the offload path is available over ASoC sound card index#0 and PCM device#0. The USB offload kcontrol will be added in addition to the existing kcontrols identified by the USB SND mixer. The kcontrols used to modify the USB audio device specific parameters are still valid and expected to be used. These parameters are not mirrored to the ASoC subsystem. Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> --- sound/usb/Kconfig | 10 +++ sound/usb/Makefile | 2 + sound/usb/mixer_usb_offload.c | 102 ++++++++++++++++++++++++++++++ sound/usb/mixer_usb_offload.h | 17 +++++ sound/usb/qcom/Makefile | 2 +- sound/usb/qcom/qc_audio_offload.c | 2 + 6 files changed, 134 insertions(+), 1 deletion(-) create mode 100644 sound/usb/mixer_usb_offload.c create mode 100644 sound/usb/mixer_usb_offload.h