diff mbox series

[v16,37/50] ALSA: usb-audio: qcom: Populate PCM and USB chip information

Message ID 20240216035923.23392-38-quic_wcheng@quicinc.com
State Superseded
Headers show
Series Introduce QC USB SND audio offloading support | expand

Commit Message

Wesley Cheng Feb. 16, 2024, 3:59 a.m. UTC 
Currently, only the index to the USB SND card array is passed to the USB
backend.  Pass through more information, specifically the USB SND card
number and the number of PCM devices available.  This allows for the DPCM
backend to determine what USB resources are available during situations,
such as USB audio offloading.

Change-Id: I29da8f39e18a8a8c863f88d0df01a57844e7c952
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 sound/usb/qcom/qc_audio_offload.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_offload.c
index db68c6c605eb..4deec0b6fc08 100644
--- a/sound/usb/qcom/qc_audio_offload.c
+++ b/sound/usb/qcom/qc_audio_offload.c
@@ -170,6 +170,21 @@  enum usb_qmi_audio_format {
 	USB_QMI_PCM_FORMAT_U32_BE,
 };
 
+static int usb_qmi_get_pcm_num(struct snd_usb_audio *chip, int direction)
+{
+	struct snd_usb_substream *subs = NULL;
+	struct snd_usb_stream *as;
+	int count = 0;
+
+	list_for_each_entry(as, &chip->pcm_list, list) {
+		subs = &as->substream[direction];
+		if (subs->ep_num)
+			count++;
+	}
+
+	return count;
+}
+
 static enum usb_qmi_audio_device_speed_enum_v01
 get_speed_info(enum usb_device_speed udev_speed)
 {
@@ -1638,6 +1653,8 @@  static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
 
 	sdev->card_idx = chip->card->number;
 	sdev->chip_idx = chip->index;
+	sdev->num_playback = usb_qmi_get_pcm_num(chip, 0);
+	sdev->num_capture = usb_qmi_get_pcm_num(chip, 1);
 	uadev[chip->card->number].sdev = sdev;
 
 	uaudio_qdev->last_card_num = chip->card->number;