From patchwork Tue May 10 23:13:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 571488 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A21BC433EF for ; Tue, 10 May 2022 23:13:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229986AbiEJXNY (ORCPT ); Tue, 10 May 2022 19:13:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229714AbiEJXNX (ORCPT ); Tue, 10 May 2022 19:13:23 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 313F25F8FD for ; Tue, 10 May 2022 16:13:22 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1noZ2e-0004Ch-Ff; Wed, 11 May 2022 01:13:20 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1noZ2e-001Zzn-R4; Wed, 11 May 2022 01:13:19 +0200 Received: from mgr by dude04.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1noZ2c-007rgU-MZ; Wed, 11 May 2022 01:13:18 +0200 From: Michael Grzeschik To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, kernel@pengutronix.de Subject: [PATCH] usb: hub: port: add sysfs entry to switch port power Date: Wed, 11 May 2022 01:13:17 +0200 Message-Id: <20220510231317.1874608-1-m.grzeschik@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mgr@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This patch adds an sysfs switch to enable/disable a port on an power switchable hub. It also ensures that the associated device gets disconnected from the logical usb tree. Signed-off-by: Michael Grzeschik Reported-by: kernel test robot --- drivers/usb/core/port.c | 47 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index d5bc36ca5b1f77..abc618d87888f3 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -17,6 +17,52 @@ static int usb_port_block_power_off; static const struct attribute_group *port_dev_group[]; +static ssize_t port_power_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_port *port_dev = to_usb_port(dev); + struct usb_device *udev = port_dev->child; + struct usb_device *hdev = to_usb_device(dev->parent->parent); + struct usb_hub *hub = usb_hub_to_struct_hub(hdev); + int port1 = port_dev->portnum; + bool value; + int rc = 0; + + if (!hub) + return -EINVAL; + + if (hub->in_reset) + return -EBUSY; + + rc = strtobool(buf, &value); + if (rc) + return rc; + + if (value) + usb_remote_wakeup(hdev); + + rc = usb_hub_set_port_power(hdev, hub, port1, value); + if (rc) + return rc; + + if (!value) { + usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); + if (!port_dev->is_superspeed) + usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); + + if (udev) { + port_dev->child = NULL; + usb_disconnect(&udev); + } + } + + if (!rc) + rc = count; + + return rc; +} +static DEVICE_ATTR_WO(port_power); + static ssize_t location_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -153,6 +199,7 @@ static struct attribute *port_dev_attrs[] = { &dev_attr_location.attr, &dev_attr_quirks.attr, &dev_attr_over_current_count.attr, + &dev_attr_port_power.attr, NULL, };