linux-kernel - Re: [PATCH] Input: alps - Demystify trackstick initialization for v3 and v6 protocols

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Message-ID: <20180418114030.5xkvynzeqf63ir7j@pali>
Date:   Wed, 18 Apr 2018 13:40:30 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Masaki Ota <masaki.ota@...alps.com>
Subject: Re: [PATCH] Input: alps - Demystify trackstick initialization for v3
 and v6 protocols

Dmitry, ping

On Wednesday 21 March 2018 17:41:26 Pali Rohár wrote:
> That is pity, but OK.
> 
> Anyway, as wrote patch which I sent in the first email matches this
> documentation.
> 
> Dmitry, can you review/comment/accept/reject this patch?
> 
> On Monday 19 March 2018 08:41:19 Masaki Ota wrote:
> > Hi, Pali,
> > 
> > v3/v6 devices are T3 type, and it can use only Method 2.
> > P36 (At this time GLIDEPOINT_T3 uses the Method 2 ....)
> > T3 has the potential that uses Method2, but I think it needs to change Firmware.
> > 
> > Best Regards,
> > Masaki Ota
> > -----Original Message-----
> > From: Pali Rohár [mailto:pali.rohar@...il.com] 
> > Sent: Friday, March 16, 2018 7:58 PM
> > To: 太田 真喜 Masaki Ota <masaki.ota@...alps.com>
> > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>; linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH] Input: alps - Demystify trackstick initialization for v3 and v6 protocols
> > 
> > Great, thank you. Enabling that RAW/extended/SP4 mode is done by sequence E6, E6, E6, F3, C8, F3, 14 (written in page 35) and it matches what function alps_trackstick_enter_extended_mode_v3_v6() in my patch is doing. So is correct.
> > 
> > On page 36 I see that there is described Method 1 for reporting stick data which prevents cursor jumps. Seems that kernel uses Method 2.
> > Method 1 depends on some prioritization.
> > 
> > Do you have some information how to activate Method 1? Sometimes I observe that problem with "cursor jumps" and from Method 1 could prevent it. So I would like to try experimenting...
> > 
> > On Wednesday 14 March 2018 23:56:46 Masaki Ota wrote:
> > > Hi, Pali,
> > > 
> > > I have added Appendix.
> > > According to this spec documents, SP raw mode is SP 4 byte mode.
> > > I think Extended mode meaning is almost all the same as Raw mode.
> > > The description of how to set is written in Page 35.
> > > 
> > > Best Regards,
> > > Masaki Ota
> > > -----Original Message-----
> > > From: Pali Rohár [mailto:pali.rohar@...il.com]
> > > Sent: Thursday, March 15, 2018 7:58 AM
> > > To: 太田 真喜 Masaki Ota <masaki.ota@...alps.com>
> > > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>; 
> > > linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
> > > Subject: Re: [PATCH] Input: alps - Demystify trackstick initialization 
> > > for v3 and v6 protocols
> > > 
> > > Hi! Thank you for information.
> > > 
> > > Your PS/2 Aux Port Control description seems to really matches. Just there is reverse order of bits. Bit 0 in description is highest, therefore matches BIT(7) macro.
> > > 
> > > Bit 6 in description (BIT(1) in code) describes SP Extended Mode which alps.c enabled. And in that description is written:
> > > 
> > > "If 1 SP is extended packet format (driver must set SP raw mode and GP absolute mode)."
> > > 
> > > Do you have any idea what "SP raw mode" is? How to set it? For me it looks like it could be that extended mode of trackstick itself.
> > > 
> > > "GP absolute mode" I guess is GlidePoint absolute mode, therefore 
> > > enable
> > > 6 byte absolute mode for touchpad.
> > > 
> > > And for Bit 7 (BIT(0)) is written:
> > > 
> > > This bit is used with the PS/2 Aux port to use the Pass-Thru mode ( see appendix A ). Do you have some information about this appendix A?
> > > 
> > > On Wednesday 14 March 2018 10:21:43 Masaki Ota wrote:
> > > > Hi, Pali,
> > > > 
> > > > I just picked up the spec which relates with trackstic.
> > > > 
> > > > Best Regards,
> > > > Masaki Ota
> > > > -----Original Message-----
> > > > From: Pali Rohár [mailto:pali.rohar@...il.com]
> > > > Sent: Tuesday, March 13, 2018 8:14 AM
> > > > To: 太田 真喜 Masaki Ota <masaki.ota@...alps.com>; Dmitry Torokhov 
> > > > <dmitry.torokhov@...il.com>
> > > > Cc: linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
> > > > Subject: Re: [PATCH] Input: alps - Demystify trackstick 
> > > > initialization for v3 and v6 protocols
> > > > 
> > > > Masaki, if you have access to the internal ALPS v3 / Rushmore 
> > > > documentation, I would like to have a review of this patch or 
> > > > confirmation of those information :-)
> > > 
> > > --
> > > Pali Rohár
> > > pali.rohar@...il.com
> > 
> > --
> > Pali Rohár
> > pali.rohar@...il.com
> 

-- 
Pali Rohár
pali.rohar@...il.com