From patchwork Tue Jun 18 20:53:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 11002719 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 93E9C14B6 for ; Tue, 18 Jun 2019 20:55:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 82034276D6 for ; Tue, 18 Jun 2019 20:55:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 725FB2833E; Tue, 18 Jun 2019 20:55:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B4555276D6 for ; Tue, 18 Jun 2019 20:55:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730774AbfFRUzY (ORCPT ); Tue, 18 Jun 2019 16:55:24 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:50554 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730713AbfFRUx4 (ORCPT ); Tue, 18 Jun 2019 16:53:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=3Fh9wRg+Eq4JTwEvQU8ngerz8amnm4rh8SHGD5kScnc=; b=HNSqCn2k2VoL3iUjLU/30cogRs Zha6fkgUTS1rJxEjQEzJBmVyYi4WMitFW+gyOIyByEpaNCvH8K/UTUwmFjB7+nyTCvWAXUPuKZ/L8 b6CaCropuS1DtMqAJrLk30u7YxmpaPDHIbuAGrOcd+LoRFjUNxkzcAcVSzHjFCSTweYoqNPe7oXgc VhEfRGAkEjvpalhWSveldBsSUgJO0whA6+BNrfcSeMvlM/FC0mvg3yBLHGUfOKaJIMyM+F+jYEda2 xZ/Gkk6fck5VdrGRUaAfnedxJBVFLWbQ44lcpk6Q9h14XYNSR3EInYlQ0AJ81IhLsPfdORJLI0VO4 QI28PTkA==; Received: from 177.133.86.196.dynamic.adsl.gvt.net.br ([177.133.86.196] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hdL74-0008Nk-CX; Tue, 18 Jun 2019 20:53:54 +0000 Received: from mchehab by bombadil.infradead.org with local (Exim 4.92) (envelope-from ) id 1hdL70-00020H-8E; Tue, 18 Jun 2019 17:53:50 -0300 From: Mauro Carvalho Chehab To: Linux Doc Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, Jonathan Corbet , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org, Jonathan Cameron Subject: [PATCH v2 22/29] docs: iio: convert to ReST Date: Tue, 18 Jun 2019 17:53:40 -0300 Message-Id: X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Rename the iio documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab Acked-by: Jonathan Cameron --- .../iio/{ep93xx_adc.txt => ep93xx_adc.rst} | 15 +++++- .../{iio_configfs.txt => iio_configfs.rst} | 52 +++++++++++-------- Documentation/iio/index.rst | 12 +++++ drivers/iio/Kconfig | 2 +- 4 files changed, 56 insertions(+), 25 deletions(-) rename Documentation/iio/{ep93xx_adc.txt => ep93xx_adc.rst} (71%) rename Documentation/iio/{iio_configfs.txt => iio_configfs.rst} (73%) create mode 100644 Documentation/iio/index.rst diff --git a/Documentation/iio/ep93xx_adc.txt b/Documentation/iio/ep93xx_adc.rst similarity index 71% rename from Documentation/iio/ep93xx_adc.txt rename to Documentation/iio/ep93xx_adc.rst index 23053e7817bd..4fd8dea3f6b8 100644 --- a/Documentation/iio/ep93xx_adc.txt +++ b/Documentation/iio/ep93xx_adc.rst @@ -1,12 +1,16 @@ -Cirrus Logic EP93xx ADC driver. +============================== +Cirrus Logic EP93xx ADC driver +============================== 1. Overview +=========== The driver is intended to work on both low-end (EP9301, EP9302) devices with 5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel touchscreen/ADC module. 2. Channel numbering +==================== Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets. EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is @@ -17,13 +21,20 @@ Assuming ep93xx_adc is IIO device0, you'd find the following entries under +-----------------+---------------+ | sysfs entry | ball/pin name | - +-----------------+---------------+ + +=================+===============+ | in_voltage0_raw | YM | + +-----------------+---------------+ | in_voltage1_raw | SXP | + +-----------------+---------------+ | in_voltage2_raw | SXM | + +-----------------+---------------+ | in_voltage3_raw | SYP | + +-----------------+---------------+ | in_voltage4_raw | SYM | + +-----------------+---------------+ | in_voltage5_raw | XP | + +-----------------+---------------+ | in_voltage6_raw | XM | + +-----------------+---------------+ | in_voltage7_raw | YP | +-----------------+---------------+ diff --git a/Documentation/iio/iio_configfs.txt b/Documentation/iio/iio_configfs.rst similarity index 73% rename from Documentation/iio/iio_configfs.txt rename to Documentation/iio/iio_configfs.rst index 4e5f101837a8..ecbfdb3afef7 100644 --- a/Documentation/iio/iio_configfs.txt +++ b/Documentation/iio/iio_configfs.rst @@ -1,6 +1,9 @@ +=============================== Industrial IIO configfs support +=============================== 1. Overview +=========== Configfs is a filesystem-based manager of kernel objects. IIO uses some objects that could be easily configured using configfs (e.g.: devices, @@ -10,20 +13,22 @@ See Documentation/filesystems/configfs/configfs.txt for more information about how configfs works. 2. Usage +======== In order to use configfs support in IIO we need to select it at compile time via CONFIG_IIO_CONFIGFS config option. -Then, mount the configfs filesystem (usually under /config directory): +Then, mount the configfs filesystem (usually under /config directory):: -$ mkdir /config -$ mount -t configfs none /config + $ mkdir /config + $ mount -t configfs none /config At this point, all default IIO groups will be created and can be accessed under /config/iio. Next chapters will describe available IIO configuration objects. 3. Software triggers +==================== One of the IIO default configfs groups is the "triggers" group. It is automagically accessible when the configfs is mounted and can be found @@ -31,40 +36,40 @@ under /config/iio/triggers. IIO software triggers implementation offers support for creating multiple trigger types. A new trigger type is usually implemented as a separate -kernel module following the interface in include/linux/iio/sw_trigger.h: +kernel module following the interface in include/linux/iio/sw_trigger.h:: -/* - * drivers/iio/trigger/iio-trig-sample.c - * sample kernel module implementing a new trigger type - */ -#include + /* + * drivers/iio/trigger/iio-trig-sample.c + * sample kernel module implementing a new trigger type + */ + #include -static struct iio_sw_trigger *iio_trig_sample_probe(const char *name) -{ + static struct iio_sw_trigger *iio_trig_sample_probe(const char *name) + { /* * This allocates and registers an IIO trigger plus other * trigger type specific initialization. */ -} + } -static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt) -{ + static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt) + { /* * This undoes the actions in iio_trig_sample_probe */ -} + } -static const struct iio_sw_trigger_ops iio_trig_sample_ops = { + static const struct iio_sw_trigger_ops iio_trig_sample_ops = { .probe = iio_trig_sample_probe, .remove = iio_trig_sample_remove, -}; + }; -static struct iio_sw_trigger_type iio_trig_sample = { + static struct iio_sw_trigger_type iio_trig_sample = { .name = "trig-sample", .owner = THIS_MODULE, .ops = &iio_trig_sample_ops, -}; + }; module_iio_sw_trigger_driver(iio_trig_sample); @@ -73,21 +78,24 @@ iio-trig-sample module will create 'trig-sample' trigger type directory /config/iio/triggers/trig-sample. We support the following interrupt sources (trigger types): + * hrtimer, uses high resolution timers as interrupt source 3.1 Hrtimer triggers creation and destruction +--------------------------------------------- Loading iio-trig-hrtimer module will register hrtimer trigger types allowing users to create hrtimer triggers under /config/iio/triggers/hrtimer. -e.g: +e.g:: -$ mkdir /config/iio/triggers/hrtimer/instance1 -$ rmdir /config/iio/triggers/hrtimer/instance1 + $ mkdir /config/iio/triggers/hrtimer/instance1 + $ rmdir /config/iio/triggers/hrtimer/instance1 Each trigger can have one or more attributes specific to the trigger type. 3.2 "hrtimer" trigger types attributes +-------------------------------------- "hrtimer" trigger type doesn't have any configurable attribute from /config dir. It does introduce the sampling_frequency attribute to trigger directory. diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst new file mode 100644 index 000000000000..0593dca89a94 --- /dev/null +++ b/Documentation/iio/index.rst @@ -0,0 +1,12 @@ +:orphan: + +============== +Industrial I/O +============== + +.. toctree:: + :maxdepth: 1 + + iio_configfs + + ep93xx_adc diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index 1d736a4952ab..5bd51853b15e 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -28,7 +28,7 @@ config IIO_CONFIGFS help This allows configuring various IIO bits through configfs (e.g. software triggers). For more info see - Documentation/iio/iio_configfs.txt. + Documentation/iio/iio_configfs.rst. config IIO_TRIGGER bool "Enable triggered sampling support"