linux-kernel - [PATCH v1 2/2] usb: gadget: composite: Draw 100mA current if not configured

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Date:   Thu, 23 Feb 2023 10:48:30 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Jó Ágila Bitsch <jgilab@...il.com>,
        Alan Stern <stern@...land.harvard.edu>
CC:     Pratham Pratap <quic_ppratap@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH v1 2/2] usb: gadget: composite: Draw 100mA current if not configured

Currently we don't change the current value if device isn't in
configured state. But the battery charging specification says,
the device can draw upto 100mA of current if its in unconfigured
state. Hence add a Vbus_draw work in composite_resume to draw
100mA if the device isn't configured.

Signed-off-by: Prashanth K <quic_prashk@...cinc.com>
---
 drivers/usb/gadget/composite.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index fa7dd6c..147d278 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -2531,6 +2531,8 @@ void composite_resume(struct usb_gadget *gadget)
 			usb_gadget_clear_selfpowered(gadget);
 
 		usb_gadget_vbus_draw(gadget, maxpower);
+	} else {
+		usb_gadget_vbus_draw(gadget, 100);
 	}
 
 	cdev->suspended = 0;
-- 
2.7.4