linux-kernel - Re:(2) [PATCH] Input: add SW_COVER_ATTACHED and SW_EXT_PEN

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Message-ID: <20201030155430epcms1p3d7f91681f7a6f1f59927a574db9b6b75@epcms1p3>
Date:   Sat, 31 Oct 2020 00:54:30 +0900
From:   Jungrae Kim <jryu.kim@...sung.com>
To:     Sebastian Reichel <sre@...nel.org>,
        Jungrae Kim <jryu.kim@...sung.com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        HyungJae Im <hj2.im@...sung.com>,
        "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "rydberg@...math.org" <rydberg@...math.org>
Subject: Re:(2) [PATCH] Input: add SW_COVER_ATTACHED and SW_EXT_PEN_ATTACHED

> Hi,
> 
> On Fri, Oct 30, 2020 at 10:15:52PM +0900, Jungrae Kim wrote:
> > From 23aed4567e234b7e108c31abadb9f3a3ccccf7d2 Mon Sep 17 00:00:00 2001
> > From: Jungrae Kim <jryu.kim@...sung.com>
> > Date: Fri, 30 Oct 2020 21:23:12 +0900
> > Subject: [PATCH] Input: add SW_COVER_ATTACHED and SW_EXT_PEN_ATTACHED
> > 
> > SW_COVER_ATTACHED represents the connected state of a removable cover
> > of a device. Value 0 means cover was attached with device, value 1 means
> > removed it.
> 
> Any reason against using SW_MACHINE_COVER? That was introduced for Nokia
> N900, where you actually remove the cover to access battery/SD card/
> SIM card (so there is state 0 = cover removed/open and state 1 = cover
> attached/closed).
> 
> -- Sebastian
> 
> > SW_EXT_PEN_ATTACHED represents the state of the pen.
> > Some device have internal pen slot. but other some device have external pen
> > slot. These two cases has different use case in userspace. So need to
> > separate a event. Value 0 means pen was detach on external pen slot on
> > device, value 1 means pen was attached external pen slot on device.
> > 
> > Signed-off-by: Jungrae Kim <jryu.kim@...sung.com>
> > ---
> >  include/linux/mod_devicetable.h        | 2 +-
> >  include/uapi/linux/input-event-codes.h | 4 +++-
> >  2 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> > index 5b08a473cdba..897f5a3e7721 100644
> > --- a/include/linux/mod_devicetable.h
> > +++ b/include/linux/mod_devicetable.h
> > @@ -320,7 +320,7 @@ struct pcmcia_device_id {
> >  #define INPUT_DEVICE_ID_LED_MAX                0x0f
> >  #define INPUT_DEVICE_ID_SND_MAX                0x07
> >  #define INPUT_DEVICE_ID_FF_MAX         0x7f
> > -#define INPUT_DEVICE_ID_SW_MAX         0x10
> > +#define INPUT_DEVICE_ID_SW_MAX         0x12
> >  #define INPUT_DEVICE_ID_PROP_MAX       0x1f
> > 
> >  #define INPUT_DEVICE_ID_MATCH_BUS      1
> > diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
> > index ee93428ced9a..a0506369de6d 100644
> > --- a/include/uapi/linux/input-event-codes.h
> > +++ b/include/uapi/linux/input-event-codes.h
> > @@ -893,7 +893,9 @@
> >  #define SW_MUTE_DEVICE         0x0e  /* set = device disabled */
> >  #define SW_PEN_INSERTED                0x0f  /* set = pen inserted */
> >  #define SW_MACHINE_COVER       0x10  /* set = cover closed */
> > -#define SW_MAX                 0x10
> > +#define SW_COVER_ATTACHED      0x11  /* set = cover attached */
> > +#define SW_EXT_PEN_ATTACHED    0x12  /* set = external pen attached */
> > +#define SW_MAX                 0x12
> >  #define SW_CNT                 (SW_MAX+1)
> > 
> >  /*
> > -- 
> > 2.17.1

We need 2 kind of event, cover open/close and cover attach/detach.
The open/close of the cover must work only if the cover is attached.
So we will check cover open/close status using SW_MACHINE_COVER.

Thanks
Jungrae Kim
                                                                                                                                                                                          68,1          Bot