linux-kernel - [PATCH v2] usb: core: skip interfaces disabled in devicetree

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Date:   Tue, 19 Feb 2019 14:52:26 +0000
From:   Mans Rullgard <mans@...sr.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2] usb: core: skip interfaces disabled in devicetree

If an interface has an associated devicetree node with status disabled,
do not register the device.  This is useful for boards with a built-in
multifunction USB device where some functions are broken or otherwise
undesired.

Signed-off-by: Mans Rullgard <mans@...sr.com>
---
Changed in v2:
- print message about skipped interfaces
---
 drivers/usb/core/message.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index bfa5eda0cc26..46bf79bc03ad 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -2007,6 +2007,13 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 	for (i = 0; i < nintf; ++i) {
 		struct usb_interface *intf = cp->interface[i];
 
+		if (intf->dev.of_node &&
+		    !of_device_is_available(intf->dev.of_node)) {
+			dev_info(&dev->dev, "skipping disabled interface %d\n",
+				 intf->cur_altsetting->desc.bInterfaceNumber);
+			continue;
+		}
+
 		dev_dbg(&dev->dev,
 			"adding %s (config #%d, interface %d)\n",
 			dev_name(&intf->dev), configuration,
-- 
2.20.1