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From: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-input@vger.kernel.org,
	linux-tegra@vger.kernel.org, patches@opensource.cirrus.com,
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	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>,
	Hans de Goede <hdegoede@redhat.com>,
	Ferruh Yigit <fery@cypress.com>, Sangwon Jee <jeesw@melfas.com>,
	Peter Hutterer <peter.hutterer@redhat.com>,
	Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>,
	kernel@collabora.com, Patrik Fimml <patrikf@chromium.org>
Subject: Re: [PATCH v4 7/7] Input: Add "inhibited" property
Date: Tue, 6 Oct 2020 15:04:28 +0200	[thread overview]
Message-ID: <ac4eeab7-8333-b96b-707b-eb2d6d0d8139@collabora.com> (raw)
In-Reply-To: <20201005181014.GL1009802@dtor-ws>

Hi Dmitry,

W dniu 05.10.2020 o 20:10, Dmitry Torokhov pisze:
> Hi Andrzej,
> 
> On Mon, Jun 08, 2020 at 01:22:11PM +0200, Andrzej Pietrasiewicz wrote:
>> @@ -284,8 +284,11 @@ static int input_get_disposition(struct input_dev *dev,
>>   	case EV_KEY:
>>   		if (is_event_supported(code, dev->keybit, KEY_MAX)) {
>>   
>> -			/* auto-repeat bypasses state updates */
>> -			if (value == 2) {
>> +			/*
>> +			 * auto-repeat bypasses state updates but repeat
>> +			 * events are ignored if the key is not pressed
>> +			 */
>> +			if (value == 2 && test_bit(code, dev->key)) {
>>   				disposition = INPUT_PASS_TO_HANDLERS;
>>   				break;
>>   			}
> 
> Is this chunk really part of inhibit support? I'd think we cancel
> autorepeat timer when we are releasing a key, no?
> 

When I look at it now it seems to me the chunk might be redundant.
But let me explain what I had in mind when adding it.

It is a matter of what we do with input events generated while a
device is inhibited. If ->open()/->close() are not provided by the
driver then inhibiting amounts to merely ignoring input events from
a device while it remains active. What else can you do if the driver
does not provide a method to prepare the device for generating events/
to stop generating events?

In this special case a user might trigger a repeated event while the
device is inhibited, then the user keeps holding the key down and the
device is uninhibited. Do we pass anything to handlers then?

In my opinion we should not. Such an event is "illegal" in a sense that it
was generated at a time when nobody wanted any events from the device.
Hence the test to let only those auto-repeat events through for which
a key is actually pressed.

However, what I see now is that if a device is inhibited, no key
will ever reach neither the "1" nor "2" state because of the "if"
in the very beginning of input_handle_event().

Regards,

Andrzej

  reply	other threads:[~2020-10-06 13:04 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200506002746.GB89269@dtor-ws>
2020-05-15 16:49 ` [PATCHv2 0/7] Support inhibiting input devices 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
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
2020-12-03  6:25                                               ` Dmitry Torokhov
2020-06-08 11:22                                             ` [PATCH v4 2/7] Input: use input_device_enabled() Andrzej Pietrasiewicz
2020-12-03  6:26                                               ` Dmitry Torokhov
     [not found]                                               ` <CGME20201207133237eucas1p26f8484944760a14e51dc7353ed33cd28@eucas1p2.samsung.com>
2020-12-07 13:32                                                 ` Marek Szyprowski
2020-12-07 15:50                                                   ` Andrzej Pietrasiewicz
2020-12-08 10:05                                                     ` Marek Szyprowski
2020-12-09  6:37                                                       ` Dmitry Torokhov
2020-12-11  7:09                                                         ` [PATCH] Input: cyapa - do not call input_device_enabled from power mode handler Dmitry Torokhov
2020-12-11  8:22                                                           ` Marek Szyprowski
2020-12-11  8:31                                                             ` Dmitry Torokhov
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
2020-10-05  5:08                                                     ` Dmitry Torokhov
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
2020-10-05  5:06                                                 ` 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
2020-10-05 18:10                                               ` Dmitry Torokhov
2020-10-06 13:04                                                 ` Andrzej Pietrasiewicz [this message]
2020-10-07  1:11                                                   ` Dmitry Torokhov
2020-10-07  1:12                                                     ` Dmitry Torokhov
2020-12-03  6:26                                                       ` Dmitry Torokhov
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
2020-12-03  6:27                                                               ` Dmitry Torokhov
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

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