On Wed, Mar 08, 2023 at 03:57:27PM -0800, Wesley Cheng wrote:
Some platforms may have support for offloading USB audio devices to a dedicated audio DSP. Introduce a set of APIs that allow for management of USB sound card and PCM devices enumerated by the USB SND class driver. This allows for the ASoC components to be aware of what USB devices are available for offloading.
Signed-off-by: Wesley Cheng quic_wcheng@quicinc.com
include/sound/soc-usb.h | 35 ++++++++ sound/soc/Makefile | 2 +- sound/soc/soc-usb.c | 180 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 216 insertions(+), 1 deletion(-) create mode 100644 include/sound/soc-usb.h create mode 100644 sound/soc/soc-usb.c
diff --git a/include/sound/soc-usb.h b/include/sound/soc-usb.h new file mode 100644 index 000000000000..378992ea07bd --- /dev/null +++ b/include/sound/soc-usb.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0
- Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
- */
+#ifndef __LINUX_SND_SOC_USB_H +#define __LINUX_SND_SOC_USB_H
+/**
- struct snd_soc_usb
- @list - list head for SND SOC struct list
- @dev - USB backend device reference
- @component - reference to DAPM component
- @connection_status_cb - callback to notify connection events
- @priv_data - driver data
- **/
+struct snd_soc_usb {
- struct list_head list;
- struct device *dev;
If this is a USB device, then make it a pointer to the real structure, not just struct device.
- struct snd_soc_component *component;
- int (*connection_status_cb)(struct snd_soc_usb *usb, int card_idx,
int connected);- void *priv_data;
+};
+int snd_soc_usb_connect(struct device *usbdev, int card_idx); +int snd_soc_usb_disconnect(struct device *usbdev); +void snd_soc_usb_set_priv_data(struct device *dev, void *priv); +void *snd_soc_usb_get_priv_data(struct device *usbdev);
Same here, you mix "dev" and "usbdev" in the names, make them real USB devices please.
+struct snd_soc_usb *snd_soc_usb_add_port(struct device *dev, void *priv,
And here.
int (*connection_cb)(struct snd_soc_usb *usb, int card_idx,int connected));+int snd_soc_usb_remove_port(struct device *dev); +#endif diff --git a/sound/soc/Makefile b/sound/soc/Makefile index 507eaed1d6a1..3305ceb59d84 100644 --- a/sound/soc/Makefile +++ b/sound/soc/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-utils.o soc-dai.o soc-component.o +snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-usb.o soc-utils.o soc-dai.o soc-component.o snd-soc-core-objs += soc-pcm.o soc-devres.o soc-ops.o soc-link.o soc-card.o snd-soc-core-$(CONFIG_SND_SOC_COMPRESS) += soc-compress.o
diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c new file mode 100644 index 000000000000..4293451cdd49 --- /dev/null +++ b/sound/soc/soc-usb.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/*
- Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
- */
+#include <linux/of.h> +#include <linux/usb.h> +#include <sound/soc.h> +#include <sound/soc-usb.h> +#include "../usb/card.h"
+static DEFINE_MUTEX(ctx_mutex); +static LIST_HEAD(usb_ctx_list);
+static struct device_node *snd_soc_find_phandle(struct device *dev) +{
- struct device_node *node;
- node = of_parse_phandle(dev->of_node, "usb-soc-be", 0);
- if (!node)
return ERR_PTR(-ENODEV);- return node;
+}
+static struct snd_soc_usb *snd_soc_find_usb_ctx(struct device *dev) +{
- struct device_node *node;
- struct snd_soc_usb *ctx = NULL;
- node = snd_soc_find_phandle(dev);
- if (IS_ERR(node))
return NULL;- mutex_lock(&ctx_mutex);
- list_for_each_entry(ctx, &usb_ctx_list, list) {
if (ctx->dev->of_node == node) {of_node_put(node);mutex_unlock(&ctx_mutex);return ctx;}- }
- of_node_put(node);
- mutex_unlock(&ctx_mutex);
- return NULL;
+}
+/**
- snd_soc_usb_get_priv_data() - Retrieve private data stored
- @dev: device reference
- Fetch the private data stored in the USB SND SOC structure.
- */
+void *snd_soc_usb_get_priv_data(struct device *dev) +{
- struct snd_soc_usb *ctx;
- ctx = snd_soc_find_usb_ctx(dev);
- if (!ctx) {
/* Check if backend device */list_for_each_entry(ctx, &usb_ctx_list, list) {if (dev->of_node == ctx->dev->of_node)goto out;
No locking for this list traversal?
thanks,
greg k-h