linux-kernel - [PATCH v12 5/6] usb: gadget: arm the function for triggering remote wakeup

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Date:   Thu, 16 Mar 2023 16:38:07 -0700
From:   Elson Roy Serrao <quic_eserrao@...cinc.com>
To:     gregkh@...uxfoundation.org, Thinh.Nguyen@...opsys.com
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        quic_wcheng@...cinc.com, quic_jackp@...cinc.com,
        Elson Roy Serrao <quic_eserrao@...cinc.com>
Subject: [PATCH v12 5/6] usb: gadget: arm the function for triggering remote wakeup

When host sends function suspend feature selector to the device,
arm the function for remote wakeup based on the received packet.
Also host queries the function wakeup capability  through a get
status request. Handle such requests in composite layer for cases
where function driver has not exposed a get_status callback.

Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
---
 drivers/usb/gadget/composite.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 2111732..2c1100e 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -2006,9 +2006,20 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 		f = cdev->config->interface[intf];
 		if (!f)
 			break;
-		status = f->get_status ? f->get_status(f) : 0;
-		if (status < 0)
-			break;
+
+		if (f->get_status) {
+			status = f->get_status(f);
+			if (status < 0)
+				break;
+		} else {
+			/* Set D0 and D1 bits based on func wakeup capability */
+			if (f->config->bmAttributes & USB_CONFIG_ATT_WAKEUP) {
+				status |= USB_INTRF_STAT_FUNC_RW_CAP;
+				if (f->func_wakeup_armed)
+					status |= USB_INTRF_STAT_FUNC_RW;
+			}
+		}
+
 		put_unaligned_le16(status & 0x0000ffff, req->buf);
 		break;
 	/*
@@ -2029,6 +2040,15 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 			f = cdev->config->interface[intf];
 			if (!f)
 				break;
+
+			if (w_index & USB_INTRF_FUNC_SUSPEND_RW) {
+				if (!(f->config->bmAttributes &
+				      USB_CONFIG_ATT_WAKEUP))
+					break;
+				f->func_wakeup_armed = (ctrl->bRequest ==
+							USB_REQ_SET_FEATURE);
+			}
+
 			value = 0;
 			if (f->func_suspend)
 				value = f->func_suspend(f, w_index >> 8);
-- 
2.7.4