From: "H. Nikolaus Schaller" <hns@goldelico.com> To: "Pali Rohár" <pali.rohar@gmail.com> Cc: "Dmitry Torokhov" <dmitry.torokhov@gmail.com>, "Sebastian Reichel" <sre@kernel.org>, "Mark Rutland" <mark.rutland@arm.com>, "Benoît Cousson" <bcousson@baylibre.com>, "Tony Lindgren" <tony@atomide.com>, "Russell King" <linux@armlinux.org.uk>, "Arnd Bergmann" <arnd@arndb.de>, "Michael Welling" <mwelling@ieee.org>, "Mika Penttilä" <mika.penttila@nextfour.com>, "Javier Martinez Canillas" <javier@osg.samsung.com>, "Igor Grinberg" <grinberg@compulab.co.il>, "Andrew F. Davis" <afd@ti.com>, "Mark Brown" <broonie@kernel.org>, "Jonathan Cameron" <jic23@kernel.org>, "Rob Herring" <robh+dt@kernel.org>, "Alexander Stein" <alexander.stein@systec-electronic.com>, "Eric Engestrom" <eric@engestrom.ch>, "Hans de Goede" <hdegoede@redhat.com>, "Benjamin Tissoires" <benjamin.tissoires@redhat.com>, "Petr Cvek" <petr.cvek@tul.cz>, "Mauro Carvalho Chehab" <mchehab@kernel.org>, "Hans Verkuil" <hans.verkuil@cisco.com>, "Nick Dyer" <nick@shmanahar.org>, "Siebren Vroegindeweij" <siebren.vroegindeweij@hotmail.com>, "Michel Verlaan" <michel.verl@gmail.com>, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, letux-kernel@openphoenux.org, linux-iio@vger.kernel.org, kernel@pyra-handheld.com, "Aaro Koskinen" <aaro.koskinen@nokia.com>, "Pavel Machek" <pavel@ucw.cz>, "Andrey Gelman" <andrey.gelman@compulab.co.il>, "Haibo Chen" <haibo.chen@freescale.com> Subject: Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Date: Mon, 20 Feb 2017 22:27:39 +0100 [thread overview] Message-ID: <C2E7AC24-75AB-442F-94A2-84904723EE41@goldelico.com> (raw) In-Reply-To: <201702202208.50498@pali> [-- Attachment #1: Type: text/plain, Size: 2180 bytes --] > Am 20.02.2017 um 22:08 schrieb Pali Rohár <pali.rohar@gmail.com>: > > On Monday 20 February 2017 20:42:15 Pali Rohár wrote: >> Hi Nikolaus! >> >> On Monday 20 February 2017 17:50:04 H. Nikolaus Schaller wrote: >>> Hi Dmitry, >>> >>>> Input driver may set resolution for given axis in units per mm >>>> (or units per radian for rotational axis ABS_RX, ABS_RY, >>>> ABS_RZ), and if you check the binding, you can use >>>> "touchscreen-x-mm" and "touchscreen-y-mm" to specify the size of >>>> entire touch surface and set resolution from it so that >>>> userspace can calculate the proper scaling factor. >>> >>> How is this information exposed by the kernel to user-space? By >>> scanning the DT file or tree? >> >> Set input_abs_set_res() from kernel. And in userspace call EVIOCGABS >> ioctl() on input device. Look at struct input_absinfo, you should >> have all needed information here. This is generic input interface, >> no DT is needed. > > Looking at kernel code... via EVIOCSABS ioctl() you can even set > resolution from userspace for specified input device. > > So this could be potentially used for calibrating input device from > userspace? (In case DT data will not fully match current HW) > >> I hope that XServer is already using it for evdev devices... >> >> For whole implementation look at evtest program. That should be good >> starting point for your userspace implementation. >> >> While I'm watching this discussion... in my opinion kernel should >> just invert input axes (when needed) It is questionable why it should do that at all then. User-Space can also easily do it. Either the driver should provide raw data only or if it does pre-processing (scaling by +/-1), why exclude pre-scaling by other factors? >> and should not do any other >> normalization or integer/floating-point >> re-calibration/re-calculation. If it correctly exports minimum >> value, maximum value and resolution then userspace can correctly >> re-scale input events to units which userspace needs (e.g. mapping >> into LCD screen pixels or whatever is needed). > > -- > Pali Rohár > pali.rohar@gmail.com [-- Attachment #2: Message signed with OpenPGP using GPGMail --] [-- Type: application/pgp-signature, Size: 801 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: "H. Nikolaus Schaller" <hns-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org> To: "Pali Rohár" <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Cc: "Dmitry Torokhov" <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, "Sebastian Reichel" <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "Mark Rutland" <mark.rutland-5wv7dgnIgG8@public.gmane.org>, "Benoît Cousson" <bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>, "Tony Lindgren" <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>, "Russell King" <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>, "Arnd Bergmann" <arnd-r2nGTMty4D4@public.gmane.org>, "Michael Welling" <mwelling-EkmVulN54Sk@public.gmane.org>, "Mika Penttilä" <mika.penttila-MRsr7dthA9VWk0Htik3J/w@public.gmane.org>, "Javier Martinez Canillas" <javier-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>, "Igor Grinberg" <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>, "Andrew F. Davis" <afd-l0cyMroinI0@public.gmane.org>, "Mark Brown" <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "Jonathan Cameron" <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "Rob Herring" <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, "Alexander Stein" <alexander.stein-93q1YBGzJSMe9JSWTWOYM3xStJ4P+DSV@public.gmane.org>, "Eric Engestrom" <eric-op+oiCINJLTt9jDmeYuA0g@public.gmane.org>, "Hans de Goede" <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Subject: Re: [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation Date: Mon, 20 Feb 2017 22:27:39 +0100 [thread overview] Message-ID: <C2E7AC24-75AB-442F-94A2-84904723EE41@goldelico.com> (raw) In-Reply-To: <201702202208.50498@pali> [-- Attachment #1: Type: text/plain, Size: 2240 bytes --] > Am 20.02.2017 um 22:08 schrieb Pali Rohár <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>: > > On Monday 20 February 2017 20:42:15 Pali Rohár wrote: >> Hi Nikolaus! >> >> On Monday 20 February 2017 17:50:04 H. Nikolaus Schaller wrote: >>> Hi Dmitry, >>> >>>> Input driver may set resolution for given axis in units per mm >>>> (or units per radian for rotational axis ABS_RX, ABS_RY, >>>> ABS_RZ), and if you check the binding, you can use >>>> "touchscreen-x-mm" and "touchscreen-y-mm" to specify the size of >>>> entire touch surface and set resolution from it so that >>>> userspace can calculate the proper scaling factor. >>> >>> How is this information exposed by the kernel to user-space? By >>> scanning the DT file or tree? >> >> Set input_abs_set_res() from kernel. And in userspace call EVIOCGABS >> ioctl() on input device. Look at struct input_absinfo, you should >> have all needed information here. This is generic input interface, >> no DT is needed. > > Looking at kernel code... via EVIOCSABS ioctl() you can even set > resolution from userspace for specified input device. > > So this could be potentially used for calibrating input device from > userspace? (In case DT data will not fully match current HW) > >> I hope that XServer is already using it for evdev devices... >> >> For whole implementation look at evtest program. That should be good >> starting point for your userspace implementation. >> >> While I'm watching this discussion... in my opinion kernel should >> just invert input axes (when needed) It is questionable why it should do that at all then. User-Space can also easily do it. Either the driver should provide raw data only or if it does pre-processing (scaling by +/-1), why exclude pre-scaling by other factors? >> and should not do any other >> normalization or integer/floating-point >> re-calibration/re-calculation. If it correctly exports minimum >> value, maximum value and resolution then userspace can correctly >> re-scale input events to units which userspace needs (e.g. mapping >> into LCD screen pixels or whatever is needed). > > -- > Pali Rohár > pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org [-- Attachment #2: Message signed with OpenPGP using GPGMail --] [-- Type: application/pgp-signature, Size: 801 bytes --]
next prev parent reply other threads:[~2017-02-20 21:27 UTC|newest] Thread overview: 209+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-28 14:53 [PATCH v9 0/8] drivers: touchscreen: tsc2007 and ads7846/tsc2046 improvements (use common touchscreen bindings, pre-calibration, spi fix and provide iio raw values) H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2017-01-09 17:43 ` Rob Herring 2017-01-09 17:43 ` Rob Herring 2017-01-28 19:33 ` Dmitry Torokhov 2017-01-28 19:33 ` Dmitry Torokhov 2017-01-28 21:44 ` H. Nikolaus Schaller 2017-01-28 21:44 ` H. Nikolaus Schaller 2017-01-28 21:44 ` H. Nikolaus Schaller 2017-02-17 20:40 ` Dmitry Torokhov 2017-02-17 20:40 ` Dmitry Torokhov 2017-02-18 3:22 ` Sebastian Reichel 2017-02-18 3:22 ` Sebastian Reichel 2017-02-18 11:33 ` H. Nikolaus Schaller 2017-02-18 11:33 ` H. Nikolaus Schaller 2017-02-18 23:44 ` Sebastian Reichel 2017-02-18 23:44 ` Sebastian Reichel 2017-02-19 12:07 ` H. Nikolaus Schaller 2017-02-19 12:07 ` H. Nikolaus Schaller 2017-02-19 20:15 ` Sebastian Reichel 2017-02-19 20:15 ` Sebastian Reichel 2017-02-20 16:49 ` H. Nikolaus Schaller 2017-02-20 16:49 ` H. Nikolaus Schaller 2017-02-18 7:45 ` [Letux-kernel] " Andreas Kemnade 2017-02-18 7:45 ` Andreas Kemnade 2017-02-18 9:15 ` Pavel Machek 2017-02-18 9:15 ` Pavel Machek 2017-02-18 11:33 ` H. Nikolaus Schaller 2017-02-18 11:33 ` H. Nikolaus Schaller 2017-02-18 18:08 ` Pavel Machek 2017-02-18 18:08 ` Pavel Machek 2017-02-18 19:17 ` H. Nikolaus Schaller 2017-02-18 19:17 ` H. Nikolaus Schaller 2017-02-18 22:54 ` Pavel Machek 2017-02-18 22:54 ` Pavel Machek 2017-02-19 12:05 ` H. Nikolaus Schaller 2017-02-19 12:05 ` H. Nikolaus Schaller 2017-02-19 14:17 ` Pavel Machek 2017-02-19 14:17 ` Pavel Machek 2017-02-19 17:04 ` H. Nikolaus Schaller 2017-02-19 17:04 ` H. Nikolaus Schaller 2017-02-19 17:15 ` Pavel Machek 2017-02-19 17:15 ` Pavel Machek 2017-02-19 17:51 ` H. Nikolaus Schaller 2017-02-19 17:51 ` H. Nikolaus Schaller 2017-02-19 19:05 ` Pavel Machek 2017-02-19 19:05 ` Pavel Machek 2017-02-19 19:31 ` H. Nikolaus Schaller 2017-02-19 19:31 ` H. Nikolaus Schaller 2017-02-19 20:57 ` Pavel Machek 2017-02-19 20:57 ` Pavel Machek 2017-02-19 22:01 ` H. Nikolaus Schaller 2017-02-19 22:01 ` H. Nikolaus Schaller 2017-02-19 22:19 ` Pavel Machek 2017-02-19 22:19 ` Pavel Machek 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 19:29 ` Pavel Machek 2017-02-20 19:29 ` Pavel Machek 2017-02-20 20:20 ` H. Nikolaus Schaller 2017-02-20 20:20 ` H. Nikolaus Schaller 2017-02-20 22:26 ` Petr Cvek 2017-02-20 22:26 ` Petr Cvek 2017-02-21 8:29 ` H. Nikolaus Schaller 2017-02-21 8:29 ` H. Nikolaus Schaller 2017-02-21 8:29 ` H. Nikolaus Schaller 2017-02-19 22:29 ` [Letux-kernel] " Andreas Kemnade 2017-02-19 22:29 ` Andreas Kemnade 2017-02-19 22:39 ` Pavel Machek 2017-02-19 22:39 ` Pavel Machek 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 19:32 ` Pavel Machek 2017-02-20 19:32 ` Pavel Machek 2017-02-20 20:22 ` H. Nikolaus Schaller 2017-02-20 20:22 ` H. Nikolaus Schaller 2017-02-20 20:50 ` H. Nikolaus Schaller 2017-02-20 20:50 ` H. Nikolaus Schaller 2017-02-18 11:32 ` H. Nikolaus Schaller 2017-02-18 11:32 ` H. Nikolaus Schaller 2017-02-18 11:32 ` H. Nikolaus Schaller 2017-02-20 1:07 ` Dmitry Torokhov 2017-02-20 1:07 ` Dmitry Torokhov 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 16:50 ` H. Nikolaus Schaller 2017-02-20 19:42 ` Pali Rohár 2017-02-20 19:42 ` Pali Rohár 2017-02-20 20:35 ` H. Nikolaus Schaller 2017-02-20 20:35 ` H. Nikolaus Schaller 2017-02-20 21:07 ` Pali Rohár 2017-02-20 21:07 ` Pali Rohár 2017-02-20 21:24 ` H. Nikolaus Schaller 2017-02-20 21:24 ` H. Nikolaus Schaller 2017-02-20 21:54 ` Pali Rohár 2017-02-20 21:54 ` Pali Rohár 2017-02-21 6:42 ` H. Nikolaus Schaller 2017-02-21 6:42 ` H. Nikolaus Schaller 2017-02-21 8:53 ` Pali Rohár 2017-02-21 8:53 ` Pali Rohár 2017-02-20 21:08 ` Pali Rohár 2017-02-20 21:08 ` Pali Rohár 2017-02-20 21:27 ` H. Nikolaus Schaller [this message] 2017-02-20 21:27 ` H. Nikolaus Schaller 2017-02-20 21:50 ` Dmitry Torokhov 2017-02-20 21:50 ` Dmitry Torokhov 2017-02-20 21:50 ` Dmitry Torokhov 2017-02-20 22:21 ` Petr Cvek 2017-02-20 22:21 ` Petr Cvek 2017-02-20 22:24 ` Dmitry Torokhov 2017-02-20 22:24 ` Dmitry Torokhov 2017-02-20 22:24 ` Dmitry Torokhov 2017-02-21 6:56 ` H. Nikolaus Schaller 2017-02-21 6:56 ` H. Nikolaus Schaller 2017-02-21 6:56 ` H. Nikolaus Schaller 2017-02-20 22:45 ` Pali Rohár 2017-02-20 22:45 ` Pali Rohár 2017-02-21 6:36 ` H. Nikolaus Schaller 2017-02-21 6:36 ` H. Nikolaus Schaller 2017-02-21 6:36 ` H. Nikolaus Schaller 2017-02-21 9:09 ` Pali Rohár 2017-02-21 9:09 ` Pali Rohár 2017-02-21 17:07 ` [Letux-kernel] " Andreas Kemnade 2017-02-21 17:07 ` Andreas Kemnade 2017-02-20 22:04 ` Pali Rohár 2017-02-20 22:04 ` Pali Rohár 2017-02-21 6:49 ` H. Nikolaus Schaller 2017-02-21 6:49 ` H. Nikolaus Schaller 2017-02-21 7:14 ` H. Nikolaus Schaller 2017-02-21 7:14 ` H. Nikolaus Schaller 2017-02-21 8:47 ` Pali Rohár 2017-02-21 8:47 ` Pali Rohár 2017-02-21 8:57 ` [Letux-kernel] " Christ van Willegen 2017-02-21 8:57 ` Christ van Willegen 2017-02-21 8:57 ` Christ van Willegen 2017-02-21 11:07 ` Pavel Machek 2017-02-21 11:07 ` Pavel Machek 2016-12-28 14:53 ` [PATCH v9 2/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2017-02-17 20:52 ` Dmitry Torokhov 2017-02-17 20:52 ` Dmitry Torokhov 2016-12-28 14:53 ` [PATCH v9 3/8] DT:omap3+tsc2007: use new common touchscreen bindings H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 4/8] drivers:input:ads7846(+tsc2046): add new common binding names, pre-calibration and flipping H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 5/8] dt-bindings: input: move ads7846 bindings to touchscreen subdirectory H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2017-02-23 9:54 ` H. Nikolaus Schaller 2017-02-23 9:54 ` H. Nikolaus Schaller 2017-02-23 9:54 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 6/8] drivers:input:ads7846(+tsc2046): fix spi module table H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2017-01-28 19:35 ` Dmitry Torokhov 2017-01-28 19:35 ` Dmitry Torokhov 2017-01-29 8:39 ` H. Nikolaus Schaller 2017-01-29 8:39 ` H. Nikolaus Schaller 2017-01-29 18:01 ` Dmitry Torokhov 2017-01-29 18:01 ` Dmitry Torokhov 2017-01-29 18:25 ` H. Nikolaus Schaller 2017-01-29 18:25 ` H. Nikolaus Schaller 2017-01-29 18:25 ` H. Nikolaus Schaller 2017-02-01 20:20 ` H. Nikolaus Schaller 2017-02-01 20:20 ` H. Nikolaus Schaller 2017-02-01 20:20 ` H. Nikolaus Schaller 2017-02-01 21:14 ` Javier Martinez Canillas 2017-02-01 21:14 ` Javier Martinez Canillas 2017-02-01 22:28 ` Dmitry Torokhov 2017-02-01 22:28 ` Dmitry Torokhov 2017-02-01 22:50 ` Javier Martinez Canillas 2017-02-01 22:50 ` Javier Martinez Canillas 2017-02-02 5:47 ` H. Nikolaus Schaller 2017-02-02 5:47 ` H. Nikolaus Schaller 2017-02-02 5:47 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 7/8] DT:omap3+ads7846: use new common touchscreen bindings H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2016-12-28 14:53 ` [PATCH v9 8/8] drivers:input:tsc2007: add iio interface to read external ADC input and temperature H. Nikolaus Schaller 2016-12-28 14:53 ` H. Nikolaus Schaller 2016-12-30 20:36 ` Jonathan Cameron 2016-12-30 20:36 ` Jonathan Cameron 2017-02-17 21:27 ` Dmitry Torokhov 2017-02-17 21:27 ` Dmitry Torokhov 2017-02-18 11:35 ` H. Nikolaus Schaller 2017-02-18 11:35 ` H. Nikolaus Schaller 2017-02-18 11:35 ` H. Nikolaus Schaller 2017-01-16 6:34 ` [PATCH v9 0/8] drivers: touchscreen: tsc2007 and ads7846/tsc2046 improvements (use common touchscreen bindings, pre-calibration, spi fix and provide iio raw values) H. Nikolaus Schaller 2017-01-16 6:34 ` H. Nikolaus Schaller 2017-01-16 6:34 ` H. Nikolaus Schaller 2017-01-21 13:08 ` Jonathan Cameron 2017-01-21 13:08 ` Jonathan Cameron 2017-01-21 13:17 ` H. Nikolaus Schaller 2017-01-21 13:17 ` H. Nikolaus Schaller 2017-01-21 13:17 ` H. Nikolaus Schaller 2017-01-28 18:16 ` [Letux-kernel] " H. Nikolaus Schaller 2017-01-28 18:16 ` H. Nikolaus Schaller 2017-01-28 18:16 ` H. Nikolaus Schaller 2017-02-12 15:18 ` H. Nikolaus Schaller 2017-02-12 15:18 ` H. Nikolaus Schaller 2017-02-12 15:18 ` H. Nikolaus Schaller 2017-02-15 14:03 ` H. Nikolaus Schaller 2017-02-15 14:03 ` H. Nikolaus Schaller 2017-02-15 14:03 ` H. Nikolaus Schaller 2017-02-17 20:43 ` Dmitry Torokhov 2017-02-17 20:43 ` Dmitry Torokhov 2017-02-17 20:43 ` Dmitry Torokhov 2017-02-18 11:30 ` H. Nikolaus Schaller 2017-02-18 11:30 ` H. Nikolaus Schaller 2017-02-18 11:30 ` H. Nikolaus Schaller
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