From patchwork Thu Oct 22 08:32:29 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 534306 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 076E4141315 for ; Thu, 22 Oct 2015 19:33:09 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756737AbbJVIdI (ORCPT ); Thu, 22 Oct 2015 04:33:08 -0400 Received: from mail-lf0-f42.google.com ([209.85.215.42]:34087 "EHLO mail-lf0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756712AbbJVIdG (ORCPT ); Thu, 22 Oct 2015 04:33:06 -0400 Received: by lfaz124 with SMTP id z124so39297449lfa.1 for ; Thu, 22 Oct 2015 01:33:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=oyZKgY3TdmMJEoZKiGMMnsRKDiiShh3B5EB+53ATSC4=; b=Z1v4lEHF1TQF/lNTN2OMpOpeu2yC28S3hv5pct6Cmf4THip65ttDVmPEdGTDMSDpdB NxEdWcPtye4TxHSnUS1rBMZlbXlg799DJdiB1r8RbaIOklnrdSo+9itbil/N/LqbMNHS v385hnBpStUL7quGRVmubxMip1+peQlCxRdHA4c7lvkvqf+QbG5Zpj68rEvPiBNZ0Zcd hOOP3Qb5CYd/3DW4JxFAfvP9f63P7MHTBdEdY+ocFNaTB7M/j/duyKYlS2nIZFM9Uikr 1lEc03EDbklKmI5flsb2XirXut4AHJyx8HV6ZiaGfi6IAcMCS2fA1U6wbpKSq0b+wrOQ ihCw== X-Gm-Message-State: ALoCoQms2aHu36L6N0E1Mc8P9th31ZMDU3I3uQbGLrKLS83W/c4bI1vASyefGQyop/sYlskRueXT X-Received: by 10.112.205.231 with SMTP id lj7mr7684628lbc.57.1445502785575; Thu, 22 Oct 2015 01:33:05 -0700 (PDT) Received: from localhost.localdomain ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id um10sm2148562lbc.15.2015.10.22.01.33.03 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Oct 2015 01:33:04 -0700 (PDT) From: Linus Walleij To: linux-gpio@vger.kernel.org, Johan Hovold , Alexandre Courbot , Arnd Bergmann , Michael Welling , Markus Pargmann Cc: Mark Brown , Amit Kucheria , Linus Walleij Subject: [PATCH 5/6] gpio: add a userspace character device ABI Date: Thu, 22 Oct 2015 10:32:29 +0200 Message-Id: <1445502750-22672-6-git-send-email-linus.walleij@linaro.org> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1445502750-22672-1-git-send-email-linus.walleij@linaro.org> References: <1445502750-22672-1-git-send-email-linus.walleij@linaro.org> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Put in some documentation for the new character device ABI so we can properly etch it in stone. Signed-off-by: Linus Walleij --- Documentation/ABI/testing/gpio-cdev | 26 ++++++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 27 insertions(+) create mode 100644 Documentation/ABI/testing/gpio-cdev diff --git a/Documentation/ABI/testing/gpio-cdev b/Documentation/ABI/testing/gpio-cdev new file mode 100644 index 000000000000..7b265fbb47e3 --- /dev/null +++ b/Documentation/ABI/testing/gpio-cdev @@ -0,0 +1,26 @@ +What: /dev/gpiochip[0-9]+ +Date: November 2015 +KernelVersion: 4.4 +Contact: linux-gpio@vger.kernel.org +Description: + The character device files /dev/gpiochip* are the interface + between GPIO chips and userspace. + + The ioctl(2)-based ABI is defined and documented in + [include/uapi]. + + The following file operations are supported: + + open(2) + Currently the only useful flags are O_RDWR. + + ioctl(2) + Initiate various actions. + See the inline documentation in [include/uapi] + for descriptions of all ioctls. + + close(2) + Stops and free up the I/O contexts that was associated + with the file descriptor. + +Users: TBD diff --git a/MAINTAINERS b/MAINTAINERS index 3bb1f52d54e0..23cd966cb974 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4642,6 +4642,7 @@ L: linux-gpio@vger.kernel.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git S: Maintained F: Documentation/gpio/ +F: Documentation/ABI/testing/gpio-cdev F: drivers/gpio/ F: include/linux/gpio/ F: include/linux/gpio.h