[PATCH v2 5/6] ALSA: usb-audio: us144mkii: Add deep sleep command

["Šerif Rami" <ramiserifpersia@gmail.com>]

Add a deep sleep vendor command to be sent during suspend, allowing the
device to enter a lower power state.

Signed-off-by: Šerif Rami <ramiserifpersia@gmail.com>
---
 sound/usb/usx2y/us144mkii.c | 7 +++++++
 sound/usb/usx2y/us144mkii.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/sound/usb/usx2y/us144mkii.c b/sound/usb/usx2y/us144mkii.c
index f7944eb2fb93..e452250fc5b4 100644
--- a/sound/usb/usx2y/us144mkii.c
+++ b/sound/usb/usx2y/us144mkii.c
@@ -322,6 +322,13 @@ static int tascam_suspend(struct usb_interface *intf, pm_message_t message)
 	usb_kill_anchored_urbs(&tascam->midi_in_anchor);
 	usb_kill_anchored_urbs(&tascam->midi_out_anchor);
 
+	dev_info(&intf->dev, "sending deep sleep command\n");
+	int err = usb_control_msg(tascam->dev, usb_sndctrlpipe(tascam->dev, 0),
+				  VENDOR_REQ_DEEP_SLEEP, RT_H2D_VENDOR_DEV,
+				  0x0000, 0x0000, NULL, 0, USB_CTRL_TIMEOUT_MS);
+	if (err < 0)
+		dev_err(&intf->dev, "deep sleep command failed: %d\n", err);
+
 	return 0;
 }
 
diff --git a/sound/usb/usx2y/us144mkii.h b/sound/usb/usx2y/us144mkii.h
index c740a0b5a0ea..ecc4c2fed9e6 100644
--- a/sound/usb/usx2y/us144mkii.h
+++ b/sound/usb/usx2y/us144mkii.h
@@ -46,6 +46,7 @@ enum uac_control_selector {
 
 enum tascam_vendor_request {
 	VENDOR_REQ_REGISTER_WRITE = 0x41,
+	VENDOR_REQ_DEEP_SLEEP = 0x44,
 	VENDOR_REQ_MODE_CONTROL = 0x49,
 };
 
-- 
2.39.5