linux-kernel - [PATCH 2/2] usb: dwc3: add an alternate path in vbus

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Date:   Mon, 22 Feb 2021 19:51:49 +0800
From:   Ray Chi <raychi@...gle.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kyletso@...gle.com, badhri@...gle.com, Ray Chi <raychi@...gle.com>
Subject: [PATCH 2/2] usb: dwc3: add an alternate path in vbus_draw callback

This patch adds an alternate path in vbus_draw callback through
power supply property POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT.

Signed-off-by: Ray Chi <raychi@...gle.com>
---
 drivers/usb/dwc3/gadget.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index aebcf8ec0716..47809835e163 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2530,11 +2530,19 @@ static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
 static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
 {
 	struct dwc3		*dwc = gadget_to_dwc(g);
+	union power_supply_propval	val = {0};
+	int				ret;
 
 	if (dwc->usb2_phy)
 		return usb_phy_set_power(dwc->usb2_phy, mA);
 
-	return 0;
+	if (!dwc->usb_psy)
+		return -EOPNOTSUPP;
+
+	val.intval = mA;
+	ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
+
+	return ret;
 }
 
 static const struct usb_gadget_ops dwc3_gadget_ops = {
-- 
2.30.0.617.g56c4b15f3c-goog