Linux-Samsung-soc Archive on lore.kernel.org
 help / color / Atom feed
From: Hans de Goede <hdegoede@redhat.com>
To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org,
	patches@opensource.cirrus.com,
	ibm-acpi-devel@lists.sourceforge.net,
	platform-driver-x86@vger.kernel.org,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Vladimir Zapolskiy <vz@mleia.com>,
	Sylvain Lemieux <slemieux.tyco@gmail.com>,
	Laxman Dewangan <ldewangan@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Barry Song <baohua@kernel.org>,
	Michael Hennerich <michael.hennerich@analog.com>,
	Nick Dyer <nick@shmanahar.org>, Ferruh Yigit <fery@cypress.com>,
	Sangwon Jee <jeesw@melfas.com>,
	Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>,
	kernel@collabora.com, Peter Hutterer <peter.hutterer@redhat.com>,
	Benjamin Tissoires <btissoir@redhat.com>
Subject: Re: [PATCHv2 0/7] Support inhibiting input devices
Date: Wed, 3 Jun 2020 19:38:02 +0200
Message-ID: <681abc14-ef0f-ff15-68ed-944b2f96bdaf@redhat.com> (raw)
In-Reply-To: <fb5bee72-6a75-88aa-8157-75f07c491eeb@collabora.com>

Hi,

On 6/3/20 3:07 PM, Andrzej Pietrasiewicz wrote:
> Hi Hans, hi Dmitry,

<snip>

> I'm taking one step back and looking at the ->open() and ->close()
> driver callbacks. They are called from input_open_device() and
> input_close_device(), respectively:
> 
> input_open_device():
> "This function should be called by input handlers when they
> want to start receive events from given input device."
> 
> ->open() callback:
> "this method is called when the very first user calls
> input_open_device(). The driver must prepare the device to start
> generating events (start polling thread, request an IRQ, submit
> URB, etc.)"
> 
> input_close_device():
> "This function should be called by input handlers when they
> want to stop receive events from given input device."
> 
> ->close() callback:
> "this method is called when the very last user calls
> input_close_device()"
> 
> It seems to me that the callback names do not reflect their
> purpose: their meaning is not to "open" or to "close" but to
> give drivers a chance to control when they start or stop
> providing events to the input core.
> 
> What would you say about changing the callbacks' names?
> I'd envsion: ->provide_events() instead of ->open() and
> ->stop_events() instead of ->close(). Of course drivers can
> exploit the fact of knowing that nobody wants any events
> from them and do whatever they consider appropriate, for
> example go into a low power mode - but the latter is beyond
> the scope of the input subsystem and is driver-specific.

I don't have much of an opinion on changing the names,
to me open/close have always means start/stop receiving
events. This follows the everything is a file philosophy,
e.g. you can also not really "open" a serial port,
yet opening /dev/ttyS0 will activate the receive IRQ
of the UART, etc. So maybe we just need to make the
docs clearer rather then do the rename?  Doing the
rename is certainly going to cause a lot of churn.

Anyways as said, I don't have much of an opinion,
so I'll leave commenting (more) on this to Dmitry.

> With such a naming change in mind let's consider inhibiting.
> We want to be able to control when to disregard events from
> a given device. It makes sense to do it at device level, otherwise
> such an operation would have to be invoked in all associated
> handlers (those that have an open handle associating them with
> the device in question). But of course we can do better than
> merely ignoring the events received: we can tell the drivers
> that we don't want any events from them, and later, at uninhibit
> time, tell them to start providing the events again. Conceptually,
> the two operations (provide or don't provide envents) are exactly
> the same thing we want to be happening at input_open_device() and
> input_close_device() time. To me, changing the names of
> ->open() and ->close() exposes this fact very well.
> 
> Consequently, ->inhibit() and ->uninhibit() won't be needed,
> and drivers which already implement ->provide_events() (formerly
> ->open()) and ->stop_events() (formerly ->close()) will receive
> full inhibit/uninhibit support for free (subject to how well they
> implement ->provide_events()/->stop_events()). Unless we can come
> up with what the drivers might be doing on top of ->stop_events()
> and ->provide_events() when inhibiting/uninhibiting, but it seems
> to me we can't. Can we?

Right. I'm happy that you've come to see that both on open/close
and on inhibit/uninhibit we want to "start receiving events" and
"stop receiving events", so that we only need one set of callbacks.

> Optionally ->close() (only the callback, not input_close_device())
> can be made return a value, just as Hans suggests. The value
> can be ignored in input_close_device() but used in input_inhibit().
> No strong opinion here, though. (btw it seems to me that
> input_inhibit() should be renamed to input_inhibit_device()).

Ack.

Regards,

Hans


  reply index

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200506002746.GB89269@dtor-ws>
2020-05-15 16:49 ` Andrzej Pietrasiewicz
2020-05-15 16:51   ` [PATCHv2 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-05-15 16:52   ` [PATCHv2 4/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-05-15 16:52   ` [PATCHv2 6/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-05-15 18:19   ` [PATCHv2 0/7] Support inhibiting input devices Hans de Goede
2020-05-17 22:55     ` Peter Hutterer
2020-05-18  2:40       ` Dmitry Torokhov
2020-05-18  7:36         ` Hans de Goede
2020-05-22 15:35         ` Andrzej Pietrasiewicz
2020-05-27  6:13           ` Peter Hutterer
2020-05-18 10:48     ` Andrzej Pietrasiewicz
2020-05-18 12:24       ` Hans de Goede
2020-05-18 13:49         ` Andrzej Pietrasiewicz
2020-05-18 14:23           ` Hans de Goede
2020-05-19  9:02             ` Andrzej Pietrasiewicz
2020-05-19  9:36               ` Hans de Goede
2020-05-27  6:34                 ` Dmitry Torokhov
2020-06-02 16:56                   ` Andrzej Pietrasiewicz
2020-06-02 17:52                     ` Dmitry Torokhov
2020-06-02 18:50                       ` Andrzej Pietrasiewicz
2020-06-02 20:19                         ` Hans de Goede
2020-06-03 13:07                           ` Andrzej Pietrasiewicz
2020-06-03 17:38                             ` Hans de Goede [this message]
2020-06-03 17:54                               ` Andrzej Pietrasiewicz
2020-06-03 19:37                                 ` Hans de Goede
2020-06-04  7:28                                   ` Dmitry Torokhov
2020-06-05 17:33                                     ` [PATCH v3 " Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 2/7] Input: use input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 3/7] ACPI: button: Access input device's users under appropriate mutex Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 4/7] ACPI: button: Use input_device_enabled() helper Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 5/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 19:49                                         ` Michał Mirosław
2020-06-05 17:33                                       ` [PATCH v3 6/7] platform/x86: thinkpad_acpi: " Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 7/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-06-05 17:41                                         ` Hans de Goede
2020-06-08 11:22                                           ` [PATCH v4 0/7] Support inhibiting input devices Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 2/7] Input: use input_device_enabled() Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 3/7] ACPI: button: Access input device's users under appropriate mutex Andrzej Pietrasiewicz
2020-06-24 15:00                                               ` Rafael J. Wysocki
2020-06-25  5:23                                                 ` Dmitry Torokhov
2020-06-25 10:55                                                   ` Rafael J. Wysocki
2020-06-08 11:22                                             ` [PATCH v4 4/7] ACPI: button: Use input_device_enabled() helper Andrzej Pietrasiewicz
2020-06-25  5:24                                               ` Dmitry Torokhov
2020-06-08 11:22                                             ` [PATCH v4 5/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-06-10  1:28                                               ` Michał Mirosław
2020-06-10  7:52                                                 ` [FIXED PATCH " Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 6/7] platform/x86: thinkpad_acpi: " Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 7/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-06-10  9:49                                             ` [PATCH v4 0/7] Support inhibiting input devices Hans de Goede
2020-06-10 10:38                                               ` Rafael J. Wysocki
2020-06-10 13:12                                                 ` Andrzej Pietrasiewicz
2020-06-10 13:21                                                   ` Hans de Goede
2020-06-10 13:41                                                     ` Andrzej Pietrasiewicz
2020-06-12  8:30                                                       ` Hans de Goede
2020-06-12  8:47                                                         ` Andrzej Pietrasiewicz
2020-06-16 17:29                                                         ` [PATCH] Input: document inhibiting Andrzej Pietrasiewicz
2020-06-16 17:38                                                           ` Randy Dunlap
2020-06-17  7:44                                                           ` Hans de Goede
2020-06-17 10:18                                                             ` [PATCH v2] " Andrzej Pietrasiewicz
2020-06-17 10:21                                                               ` Hans de Goede
2020-06-17 16:52                                                               ` Randy Dunlap
2020-06-23 13:35                                                               ` Pavel Machek
2020-06-10 14:01                                                     ` [PATCH v4 0/7] Support inhibiting input devices Rafael J. Wysocki
2020-06-10 13:52                                                 ` Hans de Goede
2020-06-10 18:28                                                 ` Dmitry Torokhov
2020-06-12  8:14                                                   ` Hans de Goede
2020-06-12  8:17                                             ` Hans de Goede
2020-08-03 14:40                                               ` Andrzej Pietrasiewicz
2020-06-07 20:24                                       ` [PATCH v3 " Pavel Machek
2020-06-08  5:37                                         ` Dmitry Torokhov
2020-06-08  9:28                                           ` Andrzej Pietrasiewicz

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=681abc14-ef0f-ff15-68ed-944b2f96bdaf@redhat.com \
    --to=hdegoede@redhat.com \
    --cc=andrzej.p@collabora.com \
    --cc=baohua@kernel.org \
    --cc=btissoir@redhat.com \
    --cc=dmitry.torokhov@gmail.com \
    --cc=fery@cypress.com \
    --cc=festevam@gmail.com \
    --cc=ibm-acpi-devel@lists.sourceforge.net \
    --cc=ibm-acpi@hmh.eng.br \
    --cc=jeesw@melfas.com \
    --cc=jic23@kernel.org \
    --cc=jonathanh@nvidia.com \
    --cc=kernel@collabora.com \
    --cc=kernel@pengutronix.de \
    --cc=kgene@kernel.org \
    --cc=knaack.h@gmx.de \
    --cc=krzk@kernel.org \
    --cc=lars@metafoo.de \
    --cc=ldewangan@nvidia.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-iio@vger.kernel.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-input@vger.kernel.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=linux-tegra@vger.kernel.org \
    --cc=michael.hennerich@analog.com \
    --cc=nick@shmanahar.org \
    --cc=patches@opensource.cirrus.com \
    --cc=peter.hutterer@redhat.com \
    --cc=platform-driver-x86@vger.kernel.org \
    --cc=pmeerw@pmeerw.net \
    --cc=rjw@rjwysocki.net \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    --cc=slemieux.tyco@gmail.com \
    --cc=thierry.reding@gmail.com \
    --cc=vz@mleia.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Samsung-soc Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-samsung-soc/0 linux-samsung-soc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-samsung-soc linux-samsung-soc/ https://lore.kernel.org/linux-samsung-soc \
		linux-samsung-soc@vger.kernel.org
	public-inbox-index linux-samsung-soc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-samsung-soc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git