From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2590670-1521720360-2-15319069630705292880 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='us-ascii' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-usb-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1521720360; b=OKQPSDmsqrJY7+iZTKH6t/pjatkzn9O+VHJ9gUy2OnL3eJR +ocKqWd/SgW13U8ue504rR5BAUd9ZvNMA1xl3SpDotFbluLbKxKGQGe+OxgGeSR0 UyULnh11aBTl+OrtK4QPQ/xAkgbxPuOMCZaMW51JNO+UoBHYfAVSavpDpB888IQk 3piqGVkHr38XDWVJ69X4jcGi4k4jAeUGA7OwzpVcd6QBDPyEqkLBDZ08IuDNU6KD XowOeQdXvvZRcaTMOwYO8L6Q9Jxi+K6ZRNoMLzb5MUdQhXO2HWR+nfO6T06DvLr1 d0O17AwD9lCZGl7JuKf+1n/GYoO2OL6cIltGJgQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to:sender :list-id; s=arctest; t=1521720360; bh=RNuF985WICvaLiyn6huNtk8MQe 6cPsTQIFbZmWFZSiY=; b=VP39wQMN9CUHCKiLixWBPb78RVCiBmZII+WTaVYgVs cPJE/OQ7bAxn1onsPNlPioQ0Hnb0ZLsEvzU5zzYoi924vVvS3mP/qV+B4MmobcCF GCj4VzPzFwyxqxMxSrzVnFy4HEAjx3a50vWw4VDihhDJyWT3/ae5LYD/UaFKHM9W ZynomMqKAFAcNjV59oEgD58an/Bq57Ftan0ojYLWeemeLh1Ni3xgMEGoK5JFA/pZ Ofwot/Jfz4yyex+PSo/PKwuYo8GqGIrqF/NE0WjE3IAW4JQezWQ7x4vrS6WIKn0o xhfCWRxGOI57shL3nNI7dAVB8dx30Bo56PK8VtQUNFyw== ARC-Authentication-Results: i=1; mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753578AbeCVMFs (ORCPT ); Thu, 22 Mar 2018 08:05:48 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:57656 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752731AbeCVMFr (ORCPT ); Thu, 22 Mar 2018 08:05:47 -0400 Date: Thu, 22 Mar 2018 13:05:43 +0100 From: Greg KH To: Richard Leitner Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stern@rowland.harvard.edu, linux@roeck-us.net, mathias.nyman@linux.intel.com, johan@kernel.org, felipe.balbi@linux.intel.com, ekorenevsky@gmail.com, peter.chen@nxp.com, drake@endlessm.com, joe@perches.com, Richard Leitner Subject: Re: [PATCH v4] usb: core: introduce per-port over-current counters Message-ID: <20180322120543.GA27923@kroah.com> References: <20180320101713.5650-1-dev@g0hl1n.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180320101713.5650-1-dev@g0hl1n.net> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-usb-owner@vger.kernel.org X-Mailing-List: linux-usb@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Tue, Mar 20, 2018 at 11:17:13AM +0100, Richard Leitner wrote: > From: Richard Leitner > > For some userspace applications information on the number of > over-current conditions at specific USB hub ports is relevant. > > In our case we have a series of USB hardware (using the cp210x driver) > which communicates using a proprietary protocol. These devices sometimes > trigger an over-current situation on some hubs. In case of such an > over-current situation the USB devices offer an interface for reducing > the max used power. As these conditions are quite rare and imply > performance reductions of the device we don't want to reduce the max > power always. > > Therefore give user-space applications the possibility to react > adequately by introducing an over_current_counter in the usb port struct > which is exported via sysfs. > > Signed-off-by: Richard Leitner > --- > Changes v4: > - reintroduce forgotten Changelog > Changes v3: > - Improve sysfs file description as recommended by greg k-h > Changes v2: > - rename oc_count to over_current_count > - add entry to Documentation/ABI > - add detailled description to commit message > --- > Documentation/ABI/testing/sysfs-bus-usb | 10 ++++++++++ > drivers/usb/core/hub.c | 4 +++- > drivers/usb/core/hub.h | 1 + > drivers/usb/core/port.c | 10 ++++++++++ > 4 files changed, 24 insertions(+), 1 deletion(-) > > diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb > index 0bd731cbb50c..c702c78f24d8 100644 > --- a/Documentation/ABI/testing/sysfs-bus-usb > +++ b/Documentation/ABI/testing/sysfs-bus-usb > @@ -189,6 +189,16 @@ Description: > The file will read "hotplug", "wired" and "not used" if the > information is available, and "unknown" otherwise. > > +What: /sys/bus/usb/devices/.../(hub interface)/portX/over_current_count > +Date: February 2018 > +Contact: Richard Leitner > +Description: > + Most hubs are able to detect over-current situations on their > + ports and report them to the kernel. This attribute is to expose > + the number of over-current situation occurred on a specific port > + to user space. This file will contain an unsigned 32 bit value > + which wraps to 0 after its maximum is reached. > + > What: /sys/bus/usb/devices/.../(hub interface)/portX/usb3_lpm_permit > Date: November 2015 > Contact: Lu Baolu > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c > index c5c1f6cf3228..6f779b518e75 100644 > --- a/drivers/usb/core/hub.c > +++ b/drivers/usb/core/hub.c > @@ -5104,8 +5104,10 @@ static void port_event(struct usb_hub *hub, int port1) > > if (portchange & USB_PORT_STAT_C_OVERCURRENT) { > u16 status = 0, unused; > + port_dev->over_current_count++; > > - dev_dbg(&port_dev->dev, "over-current change\n"); > + dev_dbg(&port_dev->dev, "over-current change #%u\n", > + port_dev->over_current_count); > usb_clear_port_feature(hdev, port1, > USB_PORT_FEAT_C_OVER_CURRENT); > msleep(100); /* Cool down */ > diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h > index 2a700ccc868c..78d7f4dad618 100644 > --- a/drivers/usb/core/hub.h > +++ b/drivers/usb/core/hub.h > @@ -100,6 +100,7 @@ struct usb_port { > unsigned int is_superspeed:1; > unsigned int usb3_lpm_u1_permit:1; > unsigned int usb3_lpm_u2_permit:1; > + unsigned int over_current_count; This should be 'u32', right? I'll go edit it by hand... thanks, greg k-h