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Message-ID: <CAEnQRZB9gcD7WvZxHi_fREk5hQcnFRcA6y6GKH8GEckiDzdi5A@mail.gmail.com>
Date: Tue, 20 Oct 2015 16:28:16 +0300
From: Daniel Baluta <daniel.baluta@...el.com>
To: Crt Mori <cmo@...exis.com>
Cc: Daniel Baluta <daniel.baluta@...el.com>,
Johnathan Iain Cameron <jic23@...nel.org>,
Joel Becker <jlbec@...lplan.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
linux-fsdevel@...r.kernel.org,
Lars-Peter Clausen <lars@...afoo.de>,
Hartmut Knaack <knaack.h@....de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"octavian.purdila@...el.com" <octavian.purdila@...el.com>,
Paul Bolle <pebolle@...cali.nl>, patrick.porlan@...el.com,
Adriana Reus <adriana.reus@...el.com>,
constantin.musca@...el.com, marten@...uitiveaerial.com,
Cristina Georgiana Opriceana <cristina.opriceana@...il.com>,
Peter Meerwald <pmeerw@...erw.net>, hch@....de,
viro@...iv.linux.org.uk, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v8 5/5] iio: Documentation: Add IIO configfs documentation
On Tue, Oct 20, 2015 at 2:50 PM, Crt Mori <cmo@...exis.com> wrote:
> On 20 October 2015 at 12:53, Daniel Baluta <daniel.baluta@...el.com> wrote:
>> Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
>> ---
>> Documentation/ABI/testing/configfs-iio | 21 ++++++++
>> Documentation/iio/iio_configfs.txt | 93 ++++++++++++++++++++++++++++++++++
>> 2 files changed, 114 insertions(+)
>> create mode 100644 Documentation/ABI/testing/configfs-iio
>> create mode 100644 Documentation/iio/iio_configfs.txt
>>
>> diff --git a/Documentation/ABI/testing/configfs-iio b/Documentation/ABI/testing/configfs-iio
>> new file mode 100644
>> index 0000000..2483756
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/configfs-iio
>> @@ -0,0 +1,21 @@
>> +What: /config/iio
>> +Date: October 2015
>> +KernelVersion: 4.4
>> +Contact: linux-iio@...r.kernel.org
>> +Description:
>> + This represents Industrial IO configuration entry point
>> + directory. It contains sub-groups corresponding to IIO
>> + objects.
>> +
>> +What: /config/iio/triggers
>> +Date: October 2015
>> +KernelVersion: 4.4
>> +Description:
>> + Industrial IO software triggers directory.
>> +
>> +What: /config/iio/triggers/hrtimers
>> +Date: October 2015
>> +KernelVersion: 4.4
>> +Description:
>> + High resolution timers directory. Creating a directory here
>> + will result in creating a hrtimer trigger in the IIO subsystem.
>> diff --git a/Documentation/iio/iio_configfs.txt b/Documentation/iio/iio_configfs.txt
>> new file mode 100644
>> index 0000000..f0add35
>> --- /dev/null
>> +++ b/Documentation/iio/iio_configfs.txt
>> @@ -0,0 +1,93 @@
>> +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,
>> +triggers).
>> +
>> +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):
>> +
>> +$ 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
> automagically is probably automatically?
Automagically is more fun :).
http://www.urbandictionary.com/define.php?term=automagically
>> +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:
>> +
>> +/*
>> + * drivers/iio/trigger/iio-trig-sample.c
>> + * sample kernel module implementing a new trigger type
>> + */
>> +#include <linux/iio/sw_trigger.h>
>> +
>> +
>> +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)
>> +{
>> + /*
>> + * This undoes the actions in iio_trig_sample_probe
>> + */
>> +}
>> +
>> +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 = {
>> + .name = "trig-sample",
>> + .owner = THIS_MODULE,
>> + .ops = &iio_trig_sample_ops,
>> +};
>> +
>> +module_iio_sw_trigger_driver(iio_trig_sample);
>> +
>> +Each trigger type has its own directory under /config/iio/triggers. Loading
>> +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:
>> +
>> +$ mkdir /config/triggers/hrtimer/instance1
>> +$ rmdir /config/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.
>> --
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