linux-kernel - Re: Regression since commit 92bac83

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Date:	Wed, 21 Oct 2015 10:30:47 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Masaki Ota <masaki.ota@...alps.com>,
	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Regression since commit 92bac83

Hi,

On 21-10-15 10:19, Pali Rohár wrote:
> On Tuesday 20 October 2015 13:39:05 Hans de Goede wrote:
>>  From 5d21a8004260c3e6287bde81c2a9e8f80144e77c Mon Sep 17 00:00:00 2001
>> From: Hans de Goede <hdegoede@...hat.com>
>> Date: Tue, 20 Oct 2015 11:12:07 +0200
>> Subject: [PATCH] alps: Only the Dell Latitude D420/430/620/630 have separate
>>   stick button bits
>>
>> commit 92bac83dd79e ("Input: alps - non interleaved V2 dualpoint has
>> separate stick button bits") assumes that all alps v2 non-interleaved
>> dual point setups have the separate stick button bits.
>>
>> Later we limited this to Dell laptops only because of reports that this
>> broke things on non Dell laptops. Now it turns out that this breaks things
>> on the Dell Latitude D600 too. So it seems that only the Dell Latitude
>> D420/430/620/630, which all share the same touchpad / stick combo,
>> have these separate bits.
>>
>> This patch limits the checking of the separate bits to only these models
>> fixing regressions with other models.
>>
>> Reported-and-tested-by: Larry Finger <Larry.Finger@...inger.net>
>> Cc: stable@...r.kernel.org
>> Tested-by: Hans de Goede <hdegoede@...hat.com>
>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>> ---
>>   drivers/input/mouse/alps.c | 48 ++++++++++++++++++++++++++++++++++++++++------
>>   1 file changed, 42 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
>> index 4d24686..41e6cb5 100644
>> --- a/drivers/input/mouse/alps.c
>> +++ b/drivers/input/mouse/alps.c
>> @@ -100,7 +100,7 @@ static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
>>   #define ALPS_FOUR_BUTTONS	0x40	/* 4 direction button present */
>>   #define ALPS_PS2_INTERLEAVED	0x80	/* 3-byte PS/2 packet interleaved with
>>   					   6-byte ALPS packet */
>> -#define ALPS_DELL		0x100	/* device is a Dell laptop */
>> +#define ALPS_STICK_BITS		0x100	/* separate stick button bits */
>>   #define ALPS_BUTTONPAD		0x200	/* device is a clickpad */
>>
>>   static const struct alps_model_info alps_model_data[] = {
>> @@ -159,6 +159,43 @@ static const struct alps_protocol_info alps_v8_protocol_data = {
>>   	ALPS_PROTO_V8, 0x18, 0x18, 0
>>   };
>>
>> +/*
>> + * Some v2 models report the stick buttons in separate bits
>> + */
>> +static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
>> +#if defined(CONFIG_DMI) && defined(CONFIG_X86)
>> +	{
>> +		/* Extrapolated from other entries */
>> +		.matches = {
>> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
>> +			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
>> +		},
>> +	},
>> +	{
>> +		/* Reported-by: Hans de Bruin <jmdebruin@...net.nl> */
>> +		.matches = {
>> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
>> +			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
>> +		},
>> +	},
>> +	{
>> +		/* Reported-by: Hans de Goede <hdegoede@...hat.com> */
>> +		.matches = {
>> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
>> +			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
>> +		},
>> +	},
>> +	{
>> +		/* Extrapolated from other entries */
>> +		.matches = {
>> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
>> +			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
>> +		},
>> +	},
>> +#endif
>> +	{ }
>> +};
>> +
>
> Hi! Are you sure that above machines do not have variants without
> ALPS_DUALPOINT or without ALPS_PASS? Because if yes, then we could see
> another break.

Yes I'm sure that these machines always come with a dualpoint setup
with pass-through support. The 20/30 models are in essence the same
with just a newer version core2duo dropped in (they changed the model
now since the newer core2duo-s where the first x86_64 cpu-s from Intel,
and the 4x0 / 6x0 models have the exact same dualpoint setup, which is
why both Hans de Bruin and me were seeing the same bug.

Regards,

Hans
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