linux-kernel - Re: [PATCH] Add model data for Dell Precision 3510 trackpad.

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Date:   Mon, 20 Feb 2017 16:38:54 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     John Preston <wcerfgba@...eup.net>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add model data for Dell Precision 3510 trackpad.

On Sunday 19 February 2017 15:24:58 John Preston wrote:
> On 2017-02-19 13:35, Pali Rohár wrote:
> >On Sunday 19 February 2017 13:16:34 John L. Preston wrote:
> >>---
> >> drivers/input/mouse/alps.c | 1 +
> >> 1 file changed, 1 insertion(+)
> >>
> >>diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> >>index 328edc8c8786..c0a4edefe54d 100644
> >>--- a/drivers/input/mouse/alps.c
> >>+++ b/drivers/input/mouse/alps.c
> >>@@ -139,6 +139,7 @@ static const struct alps_model_info
> >>alps_model_data[] = {
> >> 	{ { 0x52, 0x01, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xff, 0xff,
> >> 		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Toshiba
> >>Tecra A11-11L */
> >> 	{ { 0x73, 0x02, 0x64 }, 0x8a, { ALPS_PROTO_V4, 0x8f, 0x8f, 0 } },
> >>+	{ { 0x73, 0x03, 0x28 }, 0x13, { ALPS_PROTO_V8, 0x18, 0x18, 0 } },			/*
> >>Dell Precision 3510 */
> >> };
> >>
> >> static const struct alps_protocol_info alps_v3_protocol_data = {
> >
> >Hi John! This is not a correct place do add new proto data. I already
> >proposed reducing this table to just for PROTO_V2, but Dmitry was not
> >happy about it.
> 
> Hi Pali. :)
> 
> >
> >Anyway, look at function alps_identify() where is detection for ALPS_V8:
> >https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/input/mouse/alps.c?h=v4.10-rc8#n2829
> >
> >V8 is already detected when e7 is (0x73, 0x03, 0x28) and ec[1] is 0x01.
> >What are your ec data? Probably ec[1] is not 0x01 as otherwise it should
> >be already detected.
> 
> I have just found that code and am confused because that is not the same
> code I have running on my system. My ec[1] is 0x01 so you are correct, it
> should already be detected and my patch is unnecessary. Sorry for the
> inconvenience.
> 
> >
> >Btw, from where you got your proto data in this patch?
> 
> I pulled it from dmesg:
> 
> [john@...te ~]$ dmesg|grep "Unknown ALPS touchpad"
> [    3.071891] psmouse serio1: alps: Unknown ALPS touchpad: E7=73 03 28,
> EC=73 01 13
> 

So you have old kernel without support for your touchpad...

-- 
Pali Rohár
pali.rohar@...il.com