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Commit 4b3d4356 authored by Mayank Rana's avatar Mayank Rana
Browse files

sound: usb: Add snapshot of usb audio qmi service 



This change adds snapshot of usb audio qmi service related files.
Usb audio device enumeration remote entity communicates with usb
audio qmi server to enable or disable particular audio stream on
usb audio device. This offloads ISOC data transfer operations
to remote entity and allows apps processor to go to power collapse
more frequently for better power saving. This snapshot is taken as
of msm-4.9 commit c9738304eb08 ("qseecom: block system signals when
waiting for listener available"). This change also fixes reported
minor errors related to coding style and kzalloc() usage.

Change-Id: I8e002f1e1936a03b1a0c585a61d0340e4a00a192
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent c85e6b5e

Documentation/devicetree/bindings/sound/qcom-usb-audio-qmi-dev.txt

0 → 100644
+26 −0
Original line number Diff line number Diff line 
QTI USB Audio QMI Device



USB Audio QMI device is used to attach to remote processor IOMMU and

map USB Audio driver specific memory to iova to share with remote

processor.



Required Properties:



- compatible : "qcom,usb-audio-qmi-dev"



- iommus : A list of phandle and IOMMU specifier pairs that describe the

  IOMMU master interfaces of the device.



- qcom,usb-audio-stream-id : Stream id is prepended to iova before passing

  iova to remote processor. This allows remote processor to access iova.



- qcom,usb-audio-intr-num : Interrupter number for external sub system

  destination.



Example:

	usb_audio_qmi_dev {

		compatible = "qcom,usb-audio-qmi-dev";

		iommus = <&lpass_q6_smmu 12>;

		qcom,usb-audio-stream-id = <12>;

		qcom,usb-audio-intr-num = <1>;

	};

sound/usb/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -162,5 +162,13 @@ config SND_BCD2000 


source "sound/usb/line6/Kconfig"



config SND_USB_AUDIO_QMI

	tristate "USB Audio QMI Service driver"

	depends on MSM_QMI_INTERFACE

	help

	  Starts USB Audio QMI server to communicate with remote entity

	  to perform operations like enable or disable particular audio

	  stream on a connected USB device.



endif	# SND_USB

sound/usb/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -29,3 +29,4 @@ obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o 


obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/

obj-$(CONFIG_SND_USB_LINE6)	+= line6/

obj-$(CONFIG_SND_USB_AUDIO_QMI) += usb_audio_qmi_v01.o usb_audio_qmi_svc.o

sound/usb/card.c

+4 −2
Original line number Diff line number Diff line
@@ -417,6 +417,7 @@ static int snd_usb_audio_free(struct snd_usb_audio *chip) 
	list_for_each_entry_safe(ep, n, &chip->ep_list, list)

		snd_usb_endpoint_free(ep);



	mutex_destroy(&chip->dev_lock);

	mutex_destroy(&chip->mutex);

	if (!atomic_read(&chip->shutdown))

		dev_set_drvdata(&chip->dev->dev, NULL);
@@ -476,6 +477,7 @@ static int snd_usb_audio_create(struct usb_interface *intf, 
	}



	mutex_init(&chip->mutex);

	mutex_init(&chip->dev_lock);

	init_waitqueue_head(&chip->shutdown_wait);

	chip->index = idx;

	chip->dev = dev;
@@ -761,6 +763,8 @@ static void usb_audio_disconnect(struct usb_interface *intf) 
		return;



	card = chip->card;

	if (chip->disconnect_cb)

		chip->disconnect_cb(chip);



	mutex_lock(&register_mutex);

	if (atomic_inc_return(&chip->shutdown) == 1) {
@@ -796,8 +800,6 @@ static void usb_audio_disconnect(struct usb_interface *intf) 
	if (chip->num_interfaces <= 0) {

		usb_chip[chip->index] = NULL;

		mutex_unlock(&register_mutex);

		if (chip->disconnect_cb)

			chip->disconnect_cb(chip);

		snd_card_free_when_closed(card);

	} else {

		mutex_unlock(&register_mutex);

sound/usb/stream.c

+5 −0
Original line number Diff line number Diff line
@@ -70,9 +70,14 @@ static void snd_usb_audio_stream_free(struct snd_usb_stream *stream) 
static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)

{

	struct snd_usb_stream *stream = pcm->private_data;

	struct snd_usb_audio *chip;



	if (stream) {

		mutex_lock(&stream->chip->dev_lock);

		chip = stream->chip;

		stream->pcm = NULL;

		snd_usb_audio_stream_free(stream);

		mutex_unlock(&chip->dev_lock);

	}

}