@@ -175,6 +175,21 @@ 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)
{
@@ -1579,6 +1594,8 @@ 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;
@@ -1693,10 +1710,8 @@ static void qc_usb_audio_offload_disconnect(struct snd_usb_audio *chip)
mutex_unlock(&chip->mutex);
atomic_dec(&uaudio_qdev->qdev_in_use);
- if (!atomic_read(&uaudio_qdev->qdev_in_use)) {
- snd_soc_usb_disconnect(usb_get_usb_backend(udev));
+ if (!atomic_read(&uaudio_qdev->qdev_in_use))
qc_usb_audio_cleanup_qmi_dev();
- }
mutex_unlock(&qdev_mutex);
}
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. Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> --- sound/usb/qcom/qc_audio_offload.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-)